2024-03-29T05:48:00Z
http://sciencetechindonesia.com/index.php/jsti/oai
oai:ojs2.sciencetechindonesia.com:article/12
2017-08-21T04:15:33Z
jsti:ART
Thermal stability effect of H4[PVMo11O40]/SiO2
Sinaga, Leni
Lesbani, Aldes
Synthesis and characterization of supported polyoxometalate H4[PVMo11O40].nH2O with SiO2 through sol-gel method have been done. The compound H4[PVMo11O40]/SiO2 was characterized through FT-IR spectrophotometer, XRD, and SEM-EDX. The results showed that FT-IR spectrum of H4[PVMo11O40]/SiO2 has the primary vibration on wavenumber at 1064.7 cm-1 (P-O); 964.4 cm-1 (Mo=O); 864.1 cm-1 (Mo-Oe-Mo); 779.2 cm-1 (Mo-Oc-Mo); 462.9 cm-1 (Si-O); and 1087.9 cm-1 (Si-O-Si). The XRD diffraction pattern showed that H4[PVMo11O40].nH2O has the highest crystallinity. However, after it’s supported with SiO2, the properties of crystallinity has decreased due to the excess water during the support process. The result of SEM-EDX showed that H4[PVMo11O40]/SiO2 material has homogeneous distribution with particle size distribution of 1330 nm (1,33 μm). The acidity test by qualitative and quantitative methods show that H4[PVMo11O40]/SiO2 more acidic than H4[PVMo11O40].H2O. The effect temperature on the crystallinity showed that increasing calcination temperature made the crystallinity properties of H4[PVMo11O40]/SiO2 increased.
Keywords : polyoxometalate, H4[PVMo11O40].nH2O, SiO2.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-06-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/12
10.26554/sti.2017.2.1.25-28
Science and Technology Indonesia; Vol. 2 No. 1 (2017): January; 25-28
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/12/24
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/39
2017-10-03T23:11:06Z
jsti:ART
The Diversity of the dragonfly (Odonata) as an indication of water quality
Agus, Muhammad
Pujiastuti, Yulia
Windusari, Yuanita
biomonitoring, environmental conditions, Odonata
Information on the diversity of dragonfly in the University area is still not much. Reduced areas that support the growth and development of dragonfly species are thought to have an impact on the decline of the population and the diversity of these species. The purpose of this study identified and analyzed the diversity of dragonfly species. Dragonfly are collected through direct capture and using sticky traps, then visual observations are made for identification. Environmental conditions in the area of Sriwijaya University Campus is still good, with the visibility of environmental parameters in the form of DO, BOD and COD still meet environmental quality standards so that dragonflies are still able to lay eggs to keep their generation. Sriwijaya University campus found 19 species of Odonata belonging to 5 families and 2 sub-ordo, with the value of species diversity index of 2.05 and moderate
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/39
10.26554/sti.2017.2.4.80-84
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 80-84
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/39/43
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/41
2017-10-03T23:18:25Z
jsti:ART
Furosemide self nano emulsifying drug delivery system (SNEDDS) formulation comprising of capryol-90, polysorbate-80, and peg-400 with simplex-lattice-design
Fithri, Najma Annuria
Mardiyanto, Mardiyanto
Novita, Rennie Puspa
Andrean, Vicky
Furosemide
SNEDDS
Capryol-90
PEG-400
Polysorbate-80
Preparation of SNEDDS aims to improve solubility and absorption of furosemide in the body to reduce the dosage and minimize the side effects of drugs. Ternary diagram constructed from composition mixture produced nanoemulsion in the range of 20-40% of capryol-90, 20-40% polysorbate-80 and 40-60% PEG-400. Formulations of SNEDDS using Design-Expert®10 with simplex-lattice-design method in the study was aimed to investigate the effect of SNEDDS each component's proportions towards test responses. Emulsification time, drug content and viscosity were best demonstrated by run-7 with consecutive values of 131.68±2.14 seconds, 99.89±2.68% and 0.87±0.0043 mm2/s. The optimum formula was obtained through entering test response parameter data of all thirteen formula. Drug content and emulsification time was 107.0 ± 1.44% and 155.59±1.56 seconds with viscosity value 0.91±0.00 mm2/s. From the physical stability studies, SNEDDS formulas were stable and did not show phase separation when exposed to temparature stress testing.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/41
10.26554/sti.2017.2.4.85-88
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 85-88
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/41/44
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/42
2017-10-03T23:27:28Z
jsti:ART
Removal lead (Pb) and mercury (Hg) from juaro fish (Pangasius polyuranodon) using citric acid from pineapple extract (Ananas comosus) as chelating agent
Mariadi, Pra Dian
Sebayang, Rosnita
An assessment of dietary risk of heavy metals exposure to human is important since it is the main of exposure. The aim of study to measure the contamination of lead and mercury in juaro fish meat and the effort to reduce contaminations using citric acid from pineapple extract as a chelating agent. Samples was soaked and boiled in citric acid extract at concentration 50%, 75 %, 100 % for, 15 min, 30 min, 45 min at 25 0C, 50 0C and 100 0C. The concentration of lead and mercury in Juaro fish lower than the maximum acceptable lever for Pb and Hg respectively (1mg/kg for Pb, 0,5 mg/Kg for Hg). The result indicated that after soaking and boiling in citric acid solution form pineapple extract at concentration 100 % for 45 min at 100 0C reducing heavy metals Pb from 0,02 mg.Kg-1 to 0,003 mg.Kg-1 and Hg from 0,011 mg.Kg-1 to lower than 0,0001 mg.Kg-1. The increasing of soaking time and boiling temperature, the levels of Pb and Hg in Juaro fish Tissue will decreasing.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/42
10.26554/sti.2017.2.4.89-91
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 89-91
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/42/45
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/43
2017-08-21T08:24:33Z
jsti:ed
Front Matter
admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-08-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/43
Science and Technology Indonesia; Vol. 1 No. 1 (2016): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/43/35
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/44
2017-08-21T08:30:21Z
jsti:ed
Front Matter
admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-08-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/44
Science and Technology Indonesia; Vol. 2 No. 1 (2017): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/44/36
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/45
2017-08-21T09:06:27Z
jsti:ed
Front Matter
admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-08-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/45
Science and Technology Indonesia; Vol. 2 No. 2 (2017): April
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/45/37
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/46
2017-08-21T09:12:05Z
jsti:ed
Front Matter
admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-08-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/46
Science and Technology Indonesia; Vol. 2 No. 3 (2017): July
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/46/38
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/48
2017-10-03T23:38:06Z
jsti:ART
Hepatoprotective effect of ethanol extract of matoa leaves (Pometia pinnata) against paracetamol-induced liver disease in rats
Sihotang, Yosua Maranatha
Windiasfira, Eka
Barus, Hendro David Ginola
Herlina, Herlina
Novita, Rennie Puspa
Matoa Leaves (Pometia pinnata)
Paracetamol
Silymarin
Hepatoprotection
The hepatoprotective effects of matoa leaves were evaluated by paracetamol-induced injury in rat’s hepatocytes. The ethanolic extract of matoa leaves (EEML) at doses of 200, 300, 500 mg/kg, po and silymarin at dose of 100 mg/kg, po were given for seven days. Silymarin was given as the reference drug. Hepatoprotective effect was studied by measuring the level of AST, ALT, ALP and total protein in serum. In vivo, oral treatment with EEML at dose of 500 mg/kg significantly reduced AST, ALT, ALP in serum whereas total protein was not significantly reduce in each groups. These results indicate that the hepatoprotective action of EEML is likely related to its potent antioxidative activity. Neutralizing reactive oxygen species enhancing the activity of original natural hepatic-antioxidant enzymes may be the main mechanisms of EEML against paracetamol-induced injury.
Keywords: Matoa Leaves (Pometia pinnata), Paracetamol, Silymarin, Hepatoprotection
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/48
10.26554/sti.2017.2.4.92-95
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 92-95
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/48/46
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/49
2017-10-03T23:42:48Z
jsti:ART
Modification of (Dioscorea alata l) starch with propylene oxide to make edible film
Miksusanti, Miksusanti
Herlina, Herlina
Wiwin, Wiwin
The research about modification uwi starch (Dioscorea alata L) by using propylene oxide has been done. Concentration of propylene oxide were 6%(v/w), 8%(v/w), and 10%(v/w). The amilograf parameter after modification were characteristic breakdown viscosity 43 BU and setback viscosity 975 BU. The modification starch has edible properties according to FDA (food and drug administration) which have degree of modification < 7%, degree of substitution < 0,1 and propylene oxide concentration < 10%(v/w). The best propylene oxide in making of edible film was 8 %( v/w). The starch control can be made into edible film with thickness 0,136 mm, tensile strength 20,4605 MPa and elongation 22%. Modification starch of uwi can be made into edible film with thickness 0,146 mm, tensile strength 25, 3521 Mpa, elongation 30% and water vapor transmission 7, 2651 g/m2/24 hours. FTIR characterization of uwi starch showed the occurrence of hydroxypropylation. The peak spectrum at 2900 cm-1 showed bonding of C-H from methyl group, which is characteristic for modification starch with hydroxypropyl. Characterization with scanning electron microscopy showed that modification of uwi starch has turned the granule of starch to be fully swallon.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/49
10.26554/sti.2017.2.4.96-101
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 96-101
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/49/47
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/51
2017-10-24T21:37:13Z
jsti:ART
Adsorption of procion red and congo red dyes using microalgae Spirulina sp
Mohadi, Risfidian
Hanafiah, Zazili
Hermansyah, Hermansyah
Zulkifli, Hilda
procion red, congo red, microalgae, Spirulina sp
Adsorption of procion red and congo red dyes using microalgae Spirulina sp was conducted. Spirulina sp was obtained by cultivation and production in laboratory scale. Spirulina sp was used as adsorbent for adsorption of dyes. Adsorption process was studied by kinetic and thermodynamic in order to know the adsorption phenomena. The results showed that kinetically congo red is reactive than procion red on Spirulina sp. On the other hand, thermodynamically procion red was stable than congo red on Spirulina sp which was indicated by adsorption capacity, enthalpy, and entropy.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/51
10.26554/sti.2017.2.4.102-104
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 102-104
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/51/48
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/52
2017-10-03T07:20:27Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/52
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/52/40
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/53
2017-10-03T07:34:01Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/53
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/53/41
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/54
2017-10-03T12:28:09Z
jsti:ed
Preface
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/54
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/54/42
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/55
2018-03-04T22:50:24Z
jsti:ART
Bamboo distribution in Musi Rawas District South Sumatera Province
Ami, Elyani
Dahlan, Zulkifli
Hanum, Laila
bamboo
distribution
mura
maps
Indonesia is estimated to have 157 species of bamboo which is more than 10% of the world's bamboo species. Almost 50% of bamboo growth in Indonesia is endemic bamboo and more than 50% of bamboo species life in Indonesia have been utilized by the society conventionally. Further, the bamboo utilization is still having high potential to be developed by increasing the industrial development. This research aimed to investigate the diversity of the bamboo species in South Sumatera, particularly in Musi Rawas district. The result showed that in Musi Rawas district of South Sumatera province there are 10 species of bamboo located at 11 locations in protected forest area of 883.60 ha and production forest area of 177,976.26 ha. The large number of bamboo potentials viewed from various aspects and the many types of bamboo scattered in this district can be a supporting data in doing bamboo conservation efforts, especially in Musi Rawas district of South Sumatra province.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2017-10-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/55
10.26554/sti.2017.2.4.105-109
Science and Technology Indonesia; Vol. 2 No. 4 (2017): October; 105-109
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/55/49
Copyright (c) 2017 Science & Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/56
2018-01-24T02:42:52Z
jsti:ART
The Standardization of Ethanolic Extract of Tahongai Leaves (Kleinhovia hospita L.)
Solihah, Indah
Mardiyanto, Mardiyanto
Fertilita, Soilia
Herlina, Herlina
Charmila, Oktia
standardization
extract
Kleinhovia hospita L.
Extract is basic material for herbal drug. The formulation of herbal drugs requires consistent of biological activity, a consistent chemical profile, or simply a quality assurance programs that can be achieved by standardizing extracts. The leaves of tahongai (Kleinhovia hospita L.) have been traditionally used in Komering tribes as phytotherapy to cure the inflammation related diseases including cancer, furuncles, polyps and tonsillitis. The aim at this study was to standardize the quality of tahongai leaves ethanolic extract by determining the specific and non specific parameters of ethanolic extract of Tahongai leaves (Kleinhovia hospita L.). The Preliminary phytochemical analysis revealed presence of alkaloids, flavonoids, saponins, tanins, and steroids in extract. The result of specific parameters extracts showed that the organoleptic properties of ethanolic extract of tahongai leaves were thick, brownish black in color, has characteristic odor, astringent with slightly bitter taste, the water and ethanol soluble extractive content were 19.263% ± 0.95 and 18.30% ± 0.51 respectively. The non specific parameters of tahongai leave ethanolic extract showed the density of extract was 1.413 g/mL ± 0.04, the water content value of 21.16% ± 0.55, total ash content 15.64% ± 0.75, acid insoluble ash content 8.282% ± 0.28, Pb contamination content 3,67 ppm, Cd contamination content <0,0043 ppm, total bacteria contamination 90.5 x 101 colony/g, and the total mold and yeast contamination of 1 x 101 colony/g.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/56
10.26554/sti.2018.3.1.14-18
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 14-18
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/56/52
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/57
2018-01-24T02:42:52Z
jsti:ART
Antidiabetic Activity Test of Ethanolic Seri Leave’s (Muntingia Calabura L.) Extract in Male Rats Induced by Alloxan
Herlina, Herlina
Amriani, Annisa
Solihah, Indah
Sintya, Rizky
Ethanol extract
Seri leaves
Antidiabetic
Alloxan
Antidiabetic activity test of ethanol extract of seri leave (Muntingia calabura L.) rats induced by alloxan has been done. Male wistar albino rats are used as animal models which divided into 6 groups, normal group (aquadest), negative control group (Na CMC 0,5%), positive control group (glibenclamide 0,43 mg/200 gBB), and 1, 2, and 3 treatment groups (ethanol extract of seri leave 65, 130, dan 260 mg/kgBB). Rats blood glucose level after induced intraperitoneally by alloxan 130 mg/kgBB can be stated as diabetes when >200 mg/dL. Preprandial blood glucose levels are measured using DTN-410-K photometer, on day 0, 5, 10, and 15. The average result of AUC0-15 and percentage of decreasing blood glucose level for positive control group are 2732,5 and 37,43%, and 3 treatment groups (65 mg/kgBB, 130 mg/kgBB, and 260 mg/kgBB) 3105 and 28,90%; 2962,5 and 32,16%; 2810 and 35,66%. This point indicated that the ethanol extract of seri leave has an antidiabetic activity and there is no significant difference compared with glibenclamide (p<0,05). Percentage of blood glucose decrease level the third treatment group there is no significant difference compare with positive control group. According to the relation between percentage of blood glucose decrease level with dose, value of ED50 of ethanol extract of seri leave is 692,424 mg/kgBB.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/57
10.26554/sti.2018.3.1.7-13
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 7-13
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/57/51
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/58
2018-01-24T02:42:52Z
jsti:ART
Effects of Mesophilic and Thermophilic Temperature Condition to Biogas Production (Methane) from Palm Oil Mill Effluent (POME) with Cow Manures
Fajar, Muhammad Fajar
Faizal, Muhammad
Novia, Novia
Methane
POME
Cow manure
Biogas
Biogas is an environmentally friendly renewable energy source. Biogas can be used using Palm Oil Mill Effluents (POME). However, the % yield of biogas productivity is still not optimum due to the low conversion. The biogas productivity can be optimized by adding methanogen bacteria which increase the methane production through the anaerobic fermentation process. This study aims to utilize cow manures as the source of methanogen bacteria in methane production from POME. Furthermore, this study specifically aims to obtain the optimum productivity condition of biogas production by the composition ratio of POME and cow manures to the amount of fermentation time at 35oC and 50oC for mesophilic and thermophilic bacteria, respectively. The ratio of POME and cow mature were A1 (100:0), A2 (80:20), A3 (70:30), A4 (60:40), and A5 (0:100). The highest yield of biogas production was A2 ratio using the thermophilic condition which showed 51.33% mol with the total solid decline of 73.43%, COD removal of 77.01%, and BOD removal of 70.02%.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/58
10.26554/sti.2018.3.1.19-25
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 19-25
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/58/53
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/59
2018-04-20T23:46:08Z
jsti:ART
Correlation Among Education, Knowledge, And Economics Of Mother Toward Antipyretic Drug Usage For Toddler In Kangkung Village OKUT Sumsel 2017
Novita, Rennie Puspa
Akbari, Atika
Dharma, Nikita Surya
Sukma, Endang Putria
level of education, level of knowledge, level of economic, antipyretic for toddler, rational treatment
Fever is a symptom mostly happen with all diseases which condition shows elevated body temperature above normal (38°C) that are common among toddler. Handling fever using antipyretics should be considered related to the rationale of its use. Rationality aspect which include indication accuracy, precision of medicine, patient accuracy, dosage accuracy and precision of administration, and as well as alert to side effects. Handling fever in toddlers is very dependent on the role of parents especially mother. Different maternal education, knowledge, and economics will result in the rationale of the use of different antipyretic drugs. This study aimed to investigate whether there is relation among education, knowledge, and economics of mother toward antipyretic drug usage for toddler in Kangkung Village OKUT SUMSEL 2017 by using cross sectional design. The sample was collected using simple random sampling to get 47 samples which fulfilled the inclusion criteria. The data were collected by interview based on questionnaire and analyzed by Chi-Square test using SPSS® version 23.0. The data presented descriptively showed most of the respondents were highly educated (66%), high knowledge (61.7%), and low economic level (93.6%) and the rational use of antipyretic for toddler were 100% for appropriate drug indication, precision of medicine, patient appropriateness, and alert for side effects, as well as 31.9% dosage precision and mode of administration. The result of Chi-Square test showed that the p value for education level (p >0.05) and economic level (p >0.05) had no significant correlation, meanwhile the knowledge level (p <0.05) showed significant different to the rational use of antipyretic for toddler. It can be concluded that the knowledge toward of mother affect the rational use of antipyretic for toddler in Kangkung village OKUT regency SUMSEL 2017.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/59
10.26554/sti.2018.3.2.89-93
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 89-93
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/59/68
Copyright (c) 2018 rennie puspa novita
oai:ojs2.sciencetechindonesia.com:article/60
2018-01-24T02:42:52Z
jsti:ART
Polystyrene Plastic Waste Conversion into Liquid Fuel with Catalytic Cracking Process Using Al2O3 as Catalyst
Kholidah, Nurul
Faizal, Muhammad
Said, Muhammad
Plastic Waste
Polystyrene
Al2O3 Catalyst
Catalytic Cracking Process
The increase in energy consumption and an increase in the plastic waste generation are two major problems that arise along with economic growth and the increase in population. Styrofoam is one type of polystyrene plastic waste that can be processed into liquid fuels by cracking process. In this study, the cracking process of polystyrene plastic waste into liquid fuel carried by the catalytic cracking process using Al2O3 as a catalyst. This study aimed to determine the effect of the catalyst weight, length of cracking time and range of temperature in the catalytic cracking process of polystyrene plastic waste into liquid fuel toward the mass and characteristics of liquid fuels produced and to determine the composition of liquid fuels produced. The catalytic cracking process of polystyrene plastic waste with catalyst was done in the fixed bed type reactor by heating the reactor with a heater, where the process took place at temperature of 150°C, 200°C, 250°C and 300°C and the length of the process was varied into 20, 40, and 60 minutes and the catalyst weight was also varied, which were 4%, 6% and 8%, while the styrofoam weight was 250 grams. From the research, the highest mass of liquid fuel derived from polystyrene catalytic cracking process was in the amount of 48.8 grams and liquid yield percentage of 19.5% at temperature of 250°C, cracking time of 60 minutes and weight of 8% catalyst, while the characteristics of liquid fuel that were approaching the characteristics of gasoline was at temperatures of 250°C, cracking time of 60 minutes and weight of 6% catalyst, in which each value of density of 0.763 g/ml, specific gravity of 0.778 and oAPI gravity of 50.2. While other liquid fuels obtained from the cracking of polystyrene were still within the tolerance range characteristic properties of gasoline. Liquid fuels produced from the catalytic cracking process was analyzed using a GC-MS, in which the analysis results indicated that liquid fuels were included in the gasoline fraction.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/60
10.26554/sti.2018.3.1.1-6
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 1-6
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/60/50
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/62
2018-04-20T23:46:08Z
jsti:ART
Development of Audit Energy Application for Residential Sector
Rihartanto, Rihartanto
Kustiawan, Wawan
Subagiyo, Lambang
efficiency, conservation, energy audit, EUI
The residential sector is the biggest electric energy user in Indonesia. In this sector, there is a potential electricity saving of up to 30%. This savings can be obtained by implementing energy conservation. Energy use intensity (EUI) is a measure in assessing the efficiency of a building. From the EUI value can then be determined the efficiency criteria of a residential building, is it very efficient, efficient, moderately efficient or wasteful. An energy audit application was developed to facilitate in assessing the efficiency of a residential building in consuming electricity. The efficiency assessment in the model building shows that there is a significant electricity saving after the conservation efforts conducted, even though the model building is included efficient in the use of electrical energy.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/62
10.26554/sti.2018.3.2.77-80
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 77-80
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/62/66
Copyright (c) 2018 Rihartanto Rihartanto, Wawan Kustiawan, Lambang Subagiyo
oai:ojs2.sciencetechindonesia.com:article/64
2018-04-20T23:46:08Z
jsti:ART
Non-Destructive Measurement of Green Bitter Gourd Quality Component Using Near Infrared Spectroscopy (NIRS)
Kusumiyati, Kusumiyati
Sutari, Wawan
Hamdani, Jajang Sauman
Mubarok, Syariful
Sitepu, Rika Bhernike
Oktavia, Ade Risti
bitter-gourd, fruit-vegetable, near-infrared, non-destructive method, quality measurement
The quality component measurement of horticultural products becomes more important to achieve better quality products also to obtain uniform product. Recently, measurement by non-destructive methods turns out to be more needed, because consumers become more selective and demand producers to develop a quick, effective and accurate quality assessment system. Near Infrared Spectroscopy (NIRS) can measure plant contents quickly, relatively economical in a bigger scale, and importantly non-destructive. The measurement of quality components of green bitter gourd, such as firmness, water content, total soluble solid, and color, are important but have not been widely conducted. This research was conducted from June to August 2013 at Post Harvest Laboratory, Faculty of Agriculture, Padjadjaran University, Sumedang, Indonesia with PLS regression modeling method. The results show R-value and standard error of 0.91 and 0.47 for water content, 0.93 and 1.03 for firmness, and 0.95 and 0.49 for a* value of fruit color.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/64
10.26554/sti.2018.3.2.59-65
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 59-65
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/64/63
Copyright (c) 2018 Ade Risti Oktavia, Kusumiyati Kusumiyati, Wawan Sutari, Jajang Sauman Hamdani, Syariful Mubarok, Rika Bhernike Sitepu
oai:ojs2.sciencetechindonesia.com:article/65
2018-01-25T22:41:04Z
jsti:ART
Comparison of CTAB Method and Wizard Genomic DNA Purification System Kit from Promega on DNA Isolation of Local Varities of Rice of South Sumatera
Hanum, Laila
Windusari, Yuanita
Setiawan, Arum
Muharni, Muharni
Adriansyah, Fikri
Mubarok, Amin Ali
CTAB
Local Rice Varieties of South Sumatra
Promega
Research in the molecular field requires DNA with a high degree of purity. Local rice varieties of South Sumatra have different leaf texture so that in isolation process to obtain DNA with high purity level required the right method. This study aims to compare the quality and quantity of purity of local rice insulation of local rice varieties of South Sumatra with different methods of CTAB and Wizard Genomic DNA Purification System Kit from Promega. The research was conducted from August 2015 to December 2015 at the Laboratory of Microbiology and Genetics and Biotechnology Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, Sriwijaya University. The method used is DNA isolation method Wizard Genomic DNA Purification System Kit from promega and CTAB. Based on research that has been done result of DNA visualization showed that DNA isolate CTAB method still have smears while DNA isolate method of Wizard Genomic DNA Purification System Kit from promega not. The average DNA isolate concentration of Wizard Genomic DNA Purification System Kit method is A260 / 280 = 1.853 μg / ml. The average DNA isolate concentration of CTAB method is A260 / 280 = 1,705 μg / ml. Isolation of Rice DNA of local variety of South Sumatera using DNA method of Genomic DNA Purification System Kit from promega has higher quality and quantity compared to CTAB method.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/65
10.26554/sti.2018.3.1.26-29
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 26-29
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/65/54
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/68
2018-01-25T04:14:14Z
jsti:ART
The Definite Positive Property of Characteristic Function from Compound Geometric Distribution as The Sum of Gamma Distribution
Putri, Darvi Mailisa
Maiyastri, Maiyastri
Devianto, Dodi
compound geometric distribution, gamma distribution, characteristic function, definite positive.
In this expository article we survey characterization of compound geometric distribution as the sum of gamma distribution. The characterization of this compound distribution is obtained by using the property of characteristic function as the Laplace-Stieltjes transform. The property of definite positive characteristice function of compound geometric distribution as the sum of gamma distribution is explained by analytical methods as the quadratic form of characteristic function.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/68
10.26554/sti.2018.3.1.49-52
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 49-52
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/68/59
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/69
2018-01-24T02:53:45Z
jsti:ART
Flexibility of Custom Design over Simplex Lattice Design in Co-Processed Excipient Formulations
Kusuma, Aris Perdana
Custom design
simplex lattice design
co-processed expipient
Custom design is a modeling technique that puts forward the custom formula on the pharmaceutical formula optimization. The components may be adjusted to the formula constraints. However, these designs sometimes do not accommodate all the components used. In addition, its effectiveness is not necessarily optimal when compared with standard designs such as simplex lattice design (SLD). This study used microcrystalline cellulose PH 101 (MCC PH 101), lactose and K30 kollidon which were computerized. Custom design and SLD compared with Design Expert software based on previous research data. Tablet hardness and tapping index were used as test parameters to assess design effectiveness. The optimal formula result obtained was MCC PH 101: lactose: kollidon K30 80% each: 10%: 10% for SLD. This value differs from custom designs that get results in the absence of lactose proportions. Custom design prediction results actually get better value than SLD for tablet hardness and tapping index.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/69
10.26554/sti.2018.3.1.30-34
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 30-34
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/69/55
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/70
2018-01-24T02:42:52Z
jsti:ART
Morphological Diversity of Lansium domesticum Corr in South Sumatra
Rupiah, Rupiah Rupiah
Hanum, Laila
Negara, Zaidan P
Dahlan, Zulkifli
Yustian, Indra
Lansium domesticum
Morphology of the diversity
South Sumatera
Research on the Morphological Diversity of Lansium domesticum Corr in South Sumatra aims to examine the morphological diversity of L. domesticum in South Sumatra. The research was conducted in April 2017 to June 2017. This research was conducted by means of exploration carried out in seven districts covering, East Ogan Komering Ulu District, South Ogan Komering Ulu District, Ogan Komering Ulu District, Musirawas District, Ogan Komering Ilir District, Muara Enim District and Musi Banyuasin District. Sampling was done using purposive sampling method. Observation of morphological diversity was done by characterization of morphology and analyzed by the descriptive method. The result of this research shows that in South Sumatera, there were two variants of L. domesticum namely L. domesticum variant duku and L. domesticum variant langsat. Morphological characters that distinguish between duku and langsat variants were found under canopy conditions, the presence of hair on top and bottom surfaces of leaves, fruit shape, fruit skin thickness, fruit taste, and the presence of sap on ripe fruit.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/70
10.26554/sti.2018.3.1.41-44
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 41-44
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/70/57
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/71
2018-04-20T23:46:08Z
jsti:ART
The Property of Continuity And Positively Definite Characteristic Function of Compound Poisson Distribution As The Sum of Geometric Distribution
Yurinanda, Sherli
Yanuar, Ferra
Devianto, Dodi
compound Poisson distribution, geometric distribution, characteristic function, uniformly continuous, positively definite function.
The compound Poisson distribution as the sum of independent and identically random variables from geometric distribution is characterized by using characteristic function. The characteristic function of this compound distribution is obtained by Laplace-Stieltjes transform. It is provided a characterization of this compound distribution employing the properties of characteristic function as continuous and positively definite function.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/71
10.26554/sti.2018.3.2.53-58
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 53-58
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/71/62
Copyright (c) 2018 Dodi Devianto, Sherli Yurinanda, Ferra Yanuar
oai:ojs2.sciencetechindonesia.com:article/72
2018-01-24T02:42:52Z
jsti:ART
Diversity of Cu and Total Cr Metals in Surface Water and Sludge of Textile Wastewater from Tuan Kentang Village Seberang Ulu I Sub District Palembang
Astari, Mirza Firdyah
Napoleon, Adipati
Mohadi, Risfidian
Textile
wastewater
heavymetal
Cu
Cr total
Nowadays, the production of rainbow fabric as a traditional fabric of Palembang city has been grown rapidly. Commonly, the wastewater as the by-product of rainbow fabric production is discharged directly to domestic channels without any previous wastewater treatment. This research was aimed to evaluate the presence of Cu and total Cr heavy metal in the area of rainbow fabric industrial center in Tuan Kentang Village, Sebrang Ulu I Sub Distric, Palembang. The Cu and total Cr polluted in the collected wastewater sample was analyzed by using atomic absorption spectrometry method with wet destruction technique. The results indicated that the area of Tuan Kentang villages is contributing metal contaminants distribution and accumulation to nature.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/72
10.26554/sti.2018.3.1.45-48
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 45-48
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/72/58
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/73
2018-01-24T02:42:52Z
jsti:ART
Bioremediation of Spent Bleaching Earth (SBE) Wastes using Lipolitic Bacteria (Bacillus cereus) with Variation of Inoculum Volume
Lusia, Maria
Gofar, Nuni
Widjajanti, Hary
Spent Bleaching Earth
Bacillus cereus
bioremediation
degradation
Spent bleaching earth (SBE) is a solid waste was generated from the CPO refining step into cooking oil. SBE that was discharged directly into the environment has the potential to pollute the environment, because in the SBE waste contained oil and acid residues, which are easily to be oxidized and flammable. Therefore, SBE must be processed first before being discharged into the environment. One way to manage SBE is by bioremediation. Bioremediation is a method on cleaning the environment from contaminants by using biological agents, such as bacteria, fungi etc. The bacterial isolates used in this study were Bacillus cereus. This study aims to obtain the best inoculum and to know the ability of Bacillus cereus bacteria in degrading the oil content in SBE waste. This study used Completely Randomized Design with the volume of Bacillus cereus bacteria inoculum as a treatment, consisting of 6 treatment levels of 0 mL kg-1, 25 mL kg-1, 50 mL kg-1, 75 mL kg-1, 100 mL kg-1, 125 mL kg-1. Each treatment level was repeated 3 times, so taht 18 experimental units were obtained. Observation was done once a week, in a month. Parameters observed were bacterial population, percentage of oil degradation, and oil content degradation. The best treatment result for the bacterial population was obtained at the treatment of 100 mL kg-1, at week 4 which was 7,4 x 108 cfu g-1, and for the oil degradation was obtained at 50 mL kg-1 on the treatment at week 4 as big as 90,43%.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-01-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/73
10.26554/sti.2018.3.1.35-40
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January; 35-40
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/73/56
Copyright (c) 2018 Science and Technology Indonesia
oai:ojs2.sciencetechindonesia.com:article/75
2018-04-20T23:46:08Z
jsti:ART
Morphological Diversity of Rattan on The Three Conservation Areas In South Sumatera
Baitika, Baitika
Dahlan, Zulkifli
Yustian, Indra
Keywords: identification, morphology, rattan, South Sumatra.
Research on the diversity of rattan morphology has been conducted in three forest conservation areas in South Sumatra i.e. Bentayan Wildlife Reserve, Bukit Cogong and Gunung Raya Wildlife Reserve. This study aims to analyze the diversity of rattan morphology in three protected areas in South Sumatra. This research uses purposive sampling method by exploring the forest area. The results showed that in the Bentayan Wildlife Reserve area were found 3 species of 3 genera while in Bukit Cogong Protected Forest were found 9 species of 3 genera and in the Bentayan Wildlife Reserve area were found 5 species of 3 genera. The morphology of rattans species in the three regions have different shapes and colors of thorns on the stem, the top and the bottom surfaces of the leaves, the climbing organ and the growth nature. The same rattan species were being found in the same of two or three locations, having morphological differences in diameter and length of the stem.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/75
10.26554/sti.2018.3.2.66-72
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 66-72
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/75/64
Copyright (c) 2018 baitika tika
oai:ojs2.sciencetechindonesia.com:article/77
2018-04-20T23:46:08Z
jsti:ART
Analysis of Vegetation in Green Open Space of Gasing Industrial Area
Oktaviani, Siti Indah
Hanum, Laila
Negara, Zaidan P
Vegetation, Diversity industrial area
The study aims to determine the diversity of vegetation in the Green Open Space of the Gasing Industrial Area. The study was conducted from April to July 2017. The method of analysis used quadratic method with 2 plots at different location with three repetitions, quantitative data analysis was done on density value, dominance, frequency, important value and diversity index of each plant species. The results showed that vegetation consists of 16 tribes and 19 species, dominated by Pteridophyta and Spermatophyta. Value of vegetation diversity (2,24) and uniformity value 0,30. The higher number of the species, the higher diversity index of the species. Such characteristics are caused by environmental influences such as organic matter content and low pH and factors derived from human intervention.
Keywords: Vegetation, Diversity, industrial area
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/77
10.26554/sti.2018.3.2.81-88
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 81-88
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/77/67
Copyright (c) 2018 Siti Indah Oktaviani
oai:ojs2.sciencetechindonesia.com:article/78
2018-04-20T23:46:08Z
jsti:ART
Comparison Analysis of CBR Value Enhancement of Soil Type in Swamp Area by Addition of Fly Ash
Indrayani, Indrayani
Herius, Andi
Hasan, Arfan
Mirza, Ahmad
CBR Value, Swamp Area, Fly Ash
Roads was built on swamp areas should be consider the condition of the base soil, since the characteristics of the soil in swamp areas have always inundated and have a low soil carrying capacity (Subagyo, 2006). One of effort that could be done to improve the existing soil condition was used fly ash as a material for soil stabilization (Indera et al, 2016; Mina et al, 2016). This study was conducted to analyze the enhancement of CBR value on various soil types in swamp area by the addition of fly ash. Testing on the values of index properties, compaction, and CBR values was done in laboratory base on ASTM and AASHTO standars. The test results show that the type of soil at the location of the sampling is silty or clay gravel and sand, clay soil, and silty soil. The reduction of optimum water content after the addition of fly ash is the highest decrease of 20.92%. While the highest increase of dry content weight after the addition of fly ash was 0.904 gr / cm3. An enhancement in the value of CBR by the addition of 20% fly ash in the study area, however the increase magnitude depends on the existing soil types, ie 7.99% in the silty or clay gravel and sand, 6 - 8% in the clay soil and 0,22 - 5% on silty soil. This indicates that the addition of fly ash was the optimum used on the type of clay soil.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/78
10.26554/sti.2018.3.2.73-76
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 73-76
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/78/65
Copyright (c) 2018 Mrs Indrayani Indrayani
oai:ojs2.sciencetechindonesia.com:article/83
2018-02-06T09:11:41Z
jsti:in
Author Index
STI, Admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-02-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/83
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/83/60
Copyright (c) 2018 Admin STI
oai:ojs2.sciencetechindonesia.com:article/84
2018-02-06T09:14:36Z
jsti:in
Subject Index
STI, Admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-02-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/84
Science and Technology Indonesia; Vol. 3 No. 1 (2018): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/84/61
Copyright (c) 2018 Admin STI
oai:ojs2.sciencetechindonesia.com:article/87
2018-04-20T23:46:08Z
jsti:ART
Factors of Medicinal Plants Users as Alternative Medicinal in Indonesia
Theresiana, Yunita
Kamaluddin, Kamaluddin
Sriati, Sriati
Erina, Lili
behaviour
medicinal
plants
alternative medicinal
Traditional medicines are the cultural heritance of Indonesian nation that should be preserved and developed in order to support the society’s health development and to improve the society’s economy. This research was aimed to figure out the society’s behaviors in using traditional medicines and the dominant factors that influence them in using traditional medicines. This research is a non-experimental research, with analytical survey method and cross-sectional approach. Fifty percent of the existing districts (16 districts) were selected randomly to serve as the sample. The districts selected included the districts of Muara Kuang, Tj. Raja, Lubuk Keliat, Payaraman, Indralaya, Pemulutan, Pemulutan Selatan and Rantau Panjang, totaling eight. The number of villages selected was 66. From these villages, the research sample was selected using stratified random sampling technique, and a sample of 400 people was obtained. The analysis was conducted in a bivariate manner with chi square test. The results showed that the respondents were motivated to use traditional medicines through (a) predisposing factors perceived sickness; (b) enabling factors, including economic level, location of domicile, type of complaints, insurance and distance to health facilities; and (c) reinforcing factors, including family support and traditional medicine promotion. Serving as the predicting factors in the traditional medicine use were the variables perceived sickness, type of complaint, distance to health facilities and traditional medicine promotion, with the variables occupation, insurance, education, family support, domicile and income serving as the confounding variables.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/87
10.26554/sti.2018.3.2.94-99
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 94-99
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/87/69
Copyright (c) 2018 Yunita Theresiana, Kamaluddin Kamaluddin, Sriati Sriati, Lili Erina
oai:ojs2.sciencetechindonesia.com:article/88
2020-11-18T02:57:26Z
jsti:ART
Study of the Effect of Proximate, Ultimate, and Calorific Value Analysis on Methane Gas Emission (CH4) on Combustion of Coal for Sustainable Environment
Arisanti, Reni
Yusuf, Maulana
Faizal, M.
Coal, Proximate, Ultimate, Methane Emission
Coal is a hydrocarbon fuel consisting of a mixture of substances containing carbon, hydrogen, oxygen, and containing less sulfur and nitrogen. Utilization of coal as fuel, especially in large scale causes methane gas emissions that can increase the impact of global warming, causing a decrease in environmental quality. Methane gas emissions in coal combustion are influenced by coal proximate and ultimate analysis. Proximate analysis includes moisture content, volatile matter, and fixed carbon, while ultimate analysis is carbon, hydrogen and oxygen. This study aims to determine the analysis of the effect of proximate, ultimate, and caloric value of methane emissions in coal combustion. This research is experimental, using quantitative method with descriptive and associative approach. The effect of proximate analysis, the lower the calorific value, the higher content moisture, the time and duration of coal combustion will be longer. Coal 5674 cal / gr, burning time 65 minutes, combustion length 39 minutes, moisture content 14.85%, coal 5747 cal / gr, burning time 60 minutes, duration of burning 31 minutes, moisture content 14.71%, coal 5617 cal / gr, burning time 49 minutes, combustion length 28 minutes, moisture content 12.17%, while coal 6992 cal / gr combustion time 38 minutes, combustion time only 4 minutes, and mosisture content 3.53%. Volatile matter in coal will affect the incubation period, the higher the volatile matter of the incubation period the faster. Coal 5617 cal / g incubation period 21 minutes, volatile matter 39.20%, coal 5674 cal / gr incubation period 26 minutes, volatile matter 38.39%, coal 5747 cal / gr, incubation period 29 minutes, volatile matter 39,30 %. For coal 6992 cal / gr incubation period 34 minutes, volatile matter 18.13%. The effect of ultimate analysis, the higher the carbon content, the higher the fixed carbon content, and the lower the hydrogen, the higher the calorific value of the coal and the less methane gas emissions. While the higher the oxygen content, the more burned the coal will be, the faster the incubation time and the longer burning time, so that the emissions of methane gas out into the atmosphere will be more and more.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/88
10.26554/sti.2018.3.2.100-106
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 100-106
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/88/70
Copyright (c) 2018 Reni Ari santi
oai:ojs2.sciencetechindonesia.com:article/90
2018-04-27T03:22:25Z
jsti:ART
Analysis of Potential Landslides Using Geographic Information System (GIS) on Rail Tunnel in Gunung Gajah Village, Lahat Regency of South Sumatra
Warman, Mirza Adi
Toha, Muhammad Taufik
Hastuti, Endang Wiwik Dyah
Landslides, Slope Stability, Geographic Information System (GIS)
Lahat Regency is one of the cities which is prone to geological disasters such as landslides. The landslide is caused by a varied topography such as flat, hilly or mountainous. On January, 23rd 2016, the landslide occurred on the mouth of a railway tunnel in Gunung Gajah Village, Lahat Regency. The purpose of this study is to determine the influence of geological factor on the slope stability. The method of research is a survey method based on geographic information systems in the form of interpretation and analysis of the causes and triggers of landslides with a direct approach in the field by doing scoring an overlay technique. The analysis obtained the parameters of landslides such as: slope, lithology/physical properties of rocks, geological structure and land use. The results and conclusions of this research are the landslide potential distribution map in Gunung Gajah Village, Lahat Regency consisting of three classes of landslide vulnerability: low, medium and high and in the focus areas of research entering the high level of vulnerability.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/90
10.26554/sti.2018.3.2.107-113
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April; 107-113
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/90/73
Copyright (c) 2018 Mirza Adi Warman, Muhammad Taufik Toha, Endang Wiwik Dyah Hastuti
oai:ojs2.sciencetechindonesia.com:article/92
2018-07-27T03:02:25Z
jsti:ART
Diversity of the Aquatic Vegetation in the Irrigation Canals of Mulya Sari village, Banyu Asin Regency, South Sumatra
Septiani, Wiwik
Bernas, Siti Masreah
Windusari, Yuanita
aquatic vegetation
irrigation canals
water quality
Mulya Sari village in Banyuasin Regency is a sub-optimum tidal land with sulfuric acid characteristics which utilize irrigation canal to provide water used in household, fishing, and agriculture. Information on the diversity of aquatic vegetation in the Mulya Sari village is still not much. The purpose of this research to identified and analyzed the diversity aquatic vegetation in the irrigation canal of Mulya Sari village. The method used in this research is purposive sampling method. Aquatic vegetation data are collected trough direct study and using the square of the wooden frame size of 1 m x 1 m (transect methode), then observation are made for identification. Environmental condition in the irrigation canal is still good, with the environmental parameters in the form of Temperature, DO, BOD, TSS, TDS and pH still meet environmental quality standard. The irrigation canal in Mulyasari village was found 7 species of aquatic vegetation belonging to 3 class of Liliopsida, 3 class Monocotyledoneae, and 1 class of Dicotyledoneae, with the value of diversity index between 0,57 – 1,53 and low diversity. Corellation Pearson between water quality and sediment characters of diversity has shown Temperature, DO, BOD, TDS and pH have corellation to diversity.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-07-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/92
10.26554/sti.2018.3.3.114-118
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July; 114-118
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/92/74
Copyright (c) 2018 Wiwik Septiani, Siti Masreah Bernas, Yuanita Windusari
oai:ojs2.sciencetechindonesia.com:article/95
2019-04-28T04:10:45Z
jsti:ART
oai:ojs2.sciencetechindonesia.com:article/96
2018-09-09T10:22:49Z
jsti:ART
Synthesis of Alkyd Resin Modified with Waste Palm Cooking Oil as Precursor Using Pretreatment with Zeolite Adsorbent
Silvianti, Fitrilia
Wijayanti, Wijayanti
Sudjarwo, Wisnu A.A.
Dewi, Wikan Berliana
Research on synthesis of alkyd resin (AR) modified with waste palm cooking oil (WPCO) as precursor using alcoholys-polyesterification method was successfully conducted. The modified alkyd resin was characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetry-Differential Thermal Analysis (TG-DTA). The pretreatment was carried out for WPCO by applying adsorption technique using zeolites to remove free fatty acid (FFA). Modified alkyd resin was synthesized with the main ingredients composition consisting of WPCO, glycerol, anhydrous phthalate with the oil length of 40% at the total weight of 27.54 grams, and a small amount of CaO as catalyst. The characterization result using FTIR showed the presence of typical alkyd resin compound group at the absorption peaks 1597.06 and 1651.07 consecutively as the vibration of benzene ring from the phthalate and C=C stretching of unsaturated fatty acids. The thermal characterization was performed by using TG-DTA analysis showing that the transition glass and recrystallization at the temperature 390.25 °C and 482.46 °C respectively.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/96
10.26554/sti.2018.3.3.119-122
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July; 119-122
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/96/75
Copyright (c) 2018 Fitrilia Silvianti, Wijayanti Wijayanti, Wisnu A.A. Sudjarwo, Wikan Berliana Dewi
oai:ojs2.sciencetechindonesia.com:article/102
2018-09-09T10:23:30Z
jsti:ART
Accumulation of Some Heavy Metals in Flavoparmelia caperata and Usnea dasypoga As Air Quality Bioindicator in Palembang City
Mirawati, Mirawati
Arinafril, Arinafril
Fasisal, M.
Flavoparmelia caperata and Usnea dasypoga lichen for the first time was used to assess the concentration of heavy metals in the air in Palembang City. 5 heavy metals Cd, Cu, Pb, Fe, and Zn were measured using the transplant method. Both samples of lichen were collected from Gununghalu, Bandung. The lichen was transplanted at 7 points on the roadside, after 8 weeks, samples were collected and analyzed using SSA. The concentration of heavy metals accumulated in F. caperata was Fe> Cu> Zn> Pb> Cd, on U. dasypoga was Fe> Zn> Cu> Pb> Cd. The results showed that both types of lichen were very suitable to be used as an air quality bioindicator. The EC ratio of both transplanted samples showed higher levels of accumulation in U. dasypoga with a significant accumulation rate on Pb metal followed by Cu, Cd, Zn, and Fe. Furthermore, dendrogram showed clustering based on the concentrations of heavy metals accumulated at each station due to differences in density and vehicle type. This indicated that the metals have the same source which derived from emissions of motor vehicles, road construction activities, and other local anthropogenic activities.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/102
10.26554/sti.2018.3.3.123-129
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July; 123-129
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/102/76
Copyright (c) 2018 Mirawati - Mira
oai:ojs2.sciencetechindonesia.com:article/107
2018-04-24T07:26:23Z
jsti:in
Author Index
STI, Admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/107
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/107/71
Copyright (c) 2018 Admin STI
oai:ojs2.sciencetechindonesia.com:article/108
2018-04-24T07:32:06Z
jsti:in
Subject Index
STI, Admin
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-04-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/108
Science and Technology Indonesia; Vol. 3 No. 2 (2018): April
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/108/72
Copyright (c) 2018 Admin STI
oai:ojs2.sciencetechindonesia.com:article/109
2018-10-26T23:59:49Z
jsti:ART
The Characteristic Function Property of Mixture Negative Binomial-Exponential Distribution
Devianto, Dodi
Sarah, Sarah
Kumala, Siska Dwi
Maiyastri, Maiyastri
Negative binomial distribution, exponential distribution, characteristic function, mixture distribution
This paper introduces a new distribution by mixing the negative binomial distribution and exponential distribution namely negative binomial-exponential (NB-E) distribution. In is given the probability distribution function of NB-E distribution and its characteristic function by using Fourier-Stieltjes transform. In addition we present the some properties of characteristic function from NB-E distribution.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/109
10.26554/sti.2018.3.4.178-182
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 178-182
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/109/90
Copyright (c) 2018 Dodi Devianto, Sarah Sarah, Siska Dwi Kumala, Maiyastri Maiyastri
oai:ojs2.sciencetechindonesia.com:article/110
2018-10-26T23:59:49Z
jsti:ART
On the Infinitely Divisible of Meixner Distribution
Devianto, Dodi
Herli, Jayanti
Maiyastri, Maiyastri
Safitri, Rahma Diana
Meixner distribution, infinitely divisible distribution, characteristic function, goodness of fit test
The log-returns of most financial data show a significant leptokurtosis. For the better fit we showed a special levy process which is called the Meixner process. The Meixner distribution belongs to the class of infinitely divisible distribution chracterized by using characteristic function and it was proposed as a model for represented efficiently of the log-returns of financial data. The perfect fit of underlying Meixner distribution performing by using goodness of fit test.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/110
10.26554/sti.2018.3.4.147-150
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 147-150
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/110/85
Copyright (c) 2018 Dodi Devianto, Jayanti Herli, Maiyastri Maiyastri, Rahma Diana Safitri
oai:ojs2.sciencetechindonesia.com:article/112
2018-09-09T10:24:14Z
jsti:ART
Diversity of Phytophagous and Entomophagous Insect on Yellow Alder Flower (Turnera subulata J.E SM and Turnera ulmifolia L.) Around the Palm Oil (Elaeis guineensis J.) Plantations
Hidayat, Ryan
Irsan, Chandra
Setiawan, Arum
Entomophagous and Phytophagous Insects
Community Structure
Diversity Index
Yellow alder flower, with Indonesian name bunga pukul delapan, can influence the existence of phytophagous and entomophagous insect around any crops. The existence of these phytophagous and entomophagous insects would affect the diversity of predator and parasitoid insect species that come to these crops. This research was aimed to study the role of yellow alder flower in their influence of the presence of predatory and parasitoid insect that active in the Turnera subulata dan Turnera ulmifolia. The research was conducted at July to August 2017 in palm oil plantation of PT. Tania Selatan branch Burnai Timur 1. The results showed that phytophagous insect found in the yellow alder flower belonging to 6 orders and 25 families. Meanwhile for the entomophagous insect, it was belonging to the 7 orders and 15 families. The diversity index in Turnera subulate and Turnera ulmifolia was in range of 0.063 and 2.912 or higher than 2. The dominant index was low (in range of 0.091 to 0.125) and the evenness index was high enough in range 0.738 – 0.752.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/112
10.26554/sti.2018.3.3.130-133
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July; 130-133
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/112/77
Copyright (c) 2018 Ryan Hidayat, Chandra Irsan, Arum Setiawan
oai:ojs2.sciencetechindonesia.com:article/113
2018-09-09T10:24:37Z
jsti:ART
Variety of Pests and Arthropods in Organic and Non-organic Rice Cultivation in South Sumatera
Asroh, Ardi
Umayah, Abu
Pujiastuti, Yulia
Bioinsecticides
Ecosystems
Pesticides
The system of cropping pattern and the use of fertilizer will be different to the diversity of pests and arthropods in paddy fields. The objective of this research is to determine the pest and arthropod pests in non-organic and organic paddy in paddy fields. The applied method is the plant observations that attacked pests by using 1 ha of organic paddy field and 1 ha of non-organic paddy field. The catching arthropods is the way to observed the insects by using insect nets, trap holes, yellow trays and light traps and analyzing the result by using the Shannon-Wiener equation. This research was undertaken on April 2016 to August 2016 in Sumber Suko village, BK. VIII, Gumawang district, regency of Ogan Komering Ulu east, South Sumatera. The result of this research pointed out that the variety of pest paddy crops is relatively diverse both in non-organic and organic paddy. The abundance and variety of arthropods in organic agriculture is higher at 1.39 than non-organic agriculture at 0.87 so it can affect the extent of pest attacks on organic paddy. The ecosystem of organic paddy. The ecosystems of organic paddy is more complex in the diversity of arthropods and the abundance of microorganisms than non-organic paddy systems.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/113
10.26554/sti.2018.3.3.134-140
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July; 134-140
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/113/78
Copyright (c) 2018 Ardi Asroh, Abu Umayah, Yulia Pujiastuti
oai:ojs2.sciencetechindonesia.com:article/116
2018-10-26T23:59:49Z
jsti:ART
Adsorption of Copper from aqueous solution by chitosan using molecular imprinting technology
Azizkhani, Sepehr
Mahmoudi, Ebrahim
Emami, Arefeh
Hussain, Siti Aslina
Mohammad, Abdul Wahab
adsorption, cooper, chitosan, imprinting
In nature chitosan is a plentiful polymer with high heavy metal ion uptake capacity due to chitosan’s functional groups that chelate with the positive surfaces of heavy metal ions. In this study, epichlorohydrin was used as a crosslink to prepare the copper-imprinted chitosan as a pattern to enable the selectivity property and increase adsorption capacity. The effects of the cross-linker, PH, initial concentration and time were examined in this study to identify the optimum amount of each to remove copper metal ions from waste water by imprinted chitosan. This composite was characterized by Fourier-transform infrared spectroscopy (FTIR) test to determine the existence of copper ions in chitosan crosslinked with epichlorohydrin. Scanning electron microscopy (SEM) tests were also done to compare the surfaces of crosslinked chitosan and the removal of copper by imprinted chitosan. PH adsorption was tested from 3 to 7 and the initial concentration and time investigated were between 10 and 100 mg/l and 0 and 120 minutes respectively. The maximum capacity to adsorb was found to be at PH 7, initial concentration of 100mg/l at 90 minutes with 0.1 gr chitosan. Ultimately, the maximum adsorbent amount achieved for effective Cu(II) removal was 74.37 mg/g.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/116
10.26554/sti.2018.3.4.141-146
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 141-146
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/116/84
Copyright (c) 2018 Sepehr Azizkhani, Ebrahim Mahmoudi, Arefeh Emami, Siti Aslina Hussain, Abdul Wahab Mohammad
oai:ojs2.sciencetechindonesia.com:article/128
2019-05-02T23:47:34Z
jsti:ART
Influence of Temperature and Particle Size on Heating Value of Biobriquette from Rubber Seed
Armita, Tiara
Haryati, Sri
Mohadi, Risfidian
Wardhani, Puteri Kusuma
Rubber seed as a biomass is potentially used as the source of alternative energy in briquette. Previous research had found that rubber seed briquette has the highest heating value of 6287,8 cal/g. It can be increased by varying temperature and mesh size. In this research, the effect of temperature and particle size on the amount of heat of rubber seed biobriquette from Muarakuang (Batu Raja) was investigated. It was done in Politeknik Negeri Sriwijaya Palembang laboratory. Proximate analysis was executed in Politeknik Negeri Sriwijaya Palembang coal laboratory. The temperature varied of 250 oC, 500 oC, and 750 oC with the particle size varied by 80 mesh, 120 mesh, and 200 mesh. Quality test of fabricated biobriquette consisted of proximate analysis such as calorific value, inherent moisture, ash ratio, volatile matter ratio, and fixed carbon ratio. The highest of heating value was 6836 cal/g from biobriquette sample were found under particle size of 80 mesh and temperature of 250 oC. The heating value reached 5371 cal/g which the particle size was 200 mesh and temperature of 750 oC. The heating value of biobriquette were compared with Indonesian National Standardization (SNI), which met with the standard of heating value (5000 cal/g).
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-05-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/128
10.26554/sti.2019.4.2.57-59
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April; 57-59
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/128/111
Copyright (c) 2019 Tiara Armita, Sri Haryati, Risfidian Mohadi, Puteri Kusuma Wardhani
oai:ojs2.sciencetechindonesia.com:article/129
2019-04-28T03:24:55Z
jsti:ART
Production Methy Ester Sulfonate (MES) Based Rubber Seeds As One Of Chemical Injection Solutions In Enhanched Oil Recovery (EOR) Process
Anggraini, Ineke Febrina
Said, Muhammad
Faizal, Muhammad
One attempt to increase the recovery of oil from a reservoir is by injecting the surfactant. Surfactant is used for lowered tension interfaces (interfacial tension) between oil and water so able bring oil exit pores reservoir. It is a good opportunity for develop type surfactant based oil vegetable that is from oil seed rubber. As known from the chemical composition in oil seed rubber contain olein amounted to 39.45 % wt, which is almost approaching value olein from petrochemicals based by 40.7 %. For produce suitable surfactants with characteristics required by oil industry, then do formulation with combine MES surfactant produced with ingredients additives other as appropriate to produce a capable formula for give best performance to be applied on oil industry. From the test result, the MES from the rubber seed oil obtained has fulfilled the surfactant requirement with the value from soaking % crude oil recovery value is 0,815 % - 3,91 % with the best value is 3,91 %, pH value is 7,2 -8,2, density value is 1,006 - 1,065, the compability test result, both catalyst can be used because there is no difference and show positive results that there is no precipitate and clear colored of MES surfactant and also for Interfacial Tension test result is 0.373 - 0.254 dyne/cm.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/129
10.26554/sti.2019.4.2.52-56
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April; 52-56
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/129/107
Copyright (c) 2019 Ineke Febrina Anggraini, Muhammad Said, Muhammad Faizal
oai:ojs2.sciencetechindonesia.com:article/131
2018-08-05T05:15:24Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-08-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/131
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/131/79
Copyright (c) 2018 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/132
2018-08-05T05:17:46Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-08-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/132
Science and Technology Indonesia; Vol. 3 No. 3 (2018): July
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/132/80
Copyright (c) 2018 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/133
2018-10-26T23:59:49Z
jsti:ART
Fabrication of Thermoplastic Elastomers (TPE) by Using Emulsion Method as an Alternative Material For Vehicle Bumper Protector
Wardhani, Puteri Kusuma
Padmi T, Nur
Nasir, Subriyer
Wardhani, Puteri Kusuma
Research on Fabrication of Thermoplastic Elastomers (TPE) by Using Emulsion Method as an Alternative Material For Vehicle Bumper Protector aims to produce of the thermoplastic elastomers by emulsion method with variation of composition ratio of polypropylene grafting and Maleic Anhydride (PP-g-MA)(mL) : latex (mL) : glycerin, to have strong tensile strength results according to British Plastic Federation standard 0.5 – 2.4 (N/mm2) standard for bumper material elongation maximum of 22.62%. Emulsion method was used as sample preparation which is grafting polypropylene (PP) with Maleate Anhydride (MA) then continued with PP-g-MA Emulsion Making and Natural Rubber Latex Density. The observation technique of the test is done by FTIR PP-g-MA analysis, stability test, TPE visual analysis, TPE surface morphology using Scanning Electron Microscopy (SEM) tool and TPE tensile strength test. The results of FTIR analysis is that the samples closest to the carbonyl value of C = O with the highest absorption were without glycerine samples 1703.48 cm-1 with the absorption of 94.84% and carbonyl C-O 1219 cm-1 with the absorption of 95.19%. The stability testing of density values reaches the standard of the Plastic Federation of 0.91 - 1.30 g/mL, for samples having the highest and stable density values up to the seventh day of observation is a sample of PP-g-MA: Latex (75:25) which is 1.059 g/mL. In the SEM test on the PP-g-MA sample: Latex (75:25) with a average diameter pores size of 1.408 μm and the smallest diameter pore size of 0.728 μm. The highest value of tensile strength occurred in the sample with the comparison of PP-g-MA: Latex (75:25) 1,175 N/mm2 and a maximum elongation of 22.62%.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/133
10.26554/sti.2018.3.4.151-156
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 151-156
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/133/86
Copyright (c) 2018 Puteri Kusuma Wardhani, Nur Padmi T, Subriyer Nasir, Puteri Kusuma Wardhani
oai:ojs2.sciencetechindonesia.com:article/134
2019-01-27T13:37:15Z
jsti:ART
Alpha Glukosidase Inhibitory Test and Total Phenolic Content of Ethanol Extract of Parkia Speciosa Plant
Fitria, Fitrya
A., Annisa
S., Nikita
C., Ranna
Parkia speciosa; Total Phenolic Content; Alpha glukosidase
Parkia speciosa (Fabaceae), much grow in South Sumatera. The seed of P. speciosa used as traditional medicine for diabetes mellitus therapy. Another parts of P speciosa is suspected to have the same chemical compounds and potency as the seed. Based on phytochemical screening of leaf and rind of P speciosa have secondary metabolites as flavonoid, phenolic and terpenoid. This research aims to know effectiveness of alpha glucosidase inhibitory effect of ethanol extract of rind, leaf and seed of p. speciosa and its correlation to total phenolic content of the extracts. The inhibitory activity of the alpha glucosidase enzyme was measured at l 405 nm. The result showed that there was correlation between effectiveness of inhibitory and total phenolic content of the extract, that is the higher of the total phenolic content will caused the greater of enzymatic inhibition of extract. The IC50 of alpha glucosidase inhibitory effect of ethanol extract of rind, leaf and seed of P speciosa are 4,596 ppm, 54,341 ppm, dan 67,425 ppm and the total Phenolic content of the extract are 138,15 mgGAE/g, 59,25 mgGAE/g, dan 36,25 mgGAE/g respectively.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/134
10.26554/sti.2019.4.1.1-4
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January; 1-4
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/134/96
Copyright (c) 2019 Fitrya Fitria, Annisa A., Nikita S., Ranna C.
oai:ojs2.sciencetechindonesia.com:article/135
2018-10-26T23:59:49Z
jsti:ART
Characterization and Optimization of Capryol-90, Polysorbate-80, And Peg-400 Proportion in Mefenamic Acid Self Nanoemulsifying Drug Delivery System (SNEDDS) With Simplex-Lattice-Design
Mardiyanto, Mardiyanto
Fithri, Najma Annuria
Tandry, Martina
Mefenamic acid as pain relief drug belongs to the biopharmaceutics classification system (BCS) class II which is practically insoluble in water causing extremely low dissolution in gastrointestinal tract. The self nanoemulsifying drug delivery system (SNEDDS) is a new innovation pharmaceutical dosage form that has effectively known to increase solubilization of hydrophobic drug in polar solvent. In this study the capryol-90 was selected as oil phase in SNEDDS as it showed maximal solubility of mefenamic acid (20 mg/mL). Combination of polysorbate-80 and PEG-400 as a generally regarded as safe (GRAS) excipient were used as surfactant and co-surfactant in SNEDDS due to its high HLB property that can increase mefenamic acid solubility in water. The ternary phase diagram of capryol-90, polysorbate-80, and PEG-400 was constructed in advance to obtain the component concentration of spontaneous nanoemulsion region. Model simplex-lattice-design cooperated in Design-Expert®10 was used to define SNEDDS mefenamic acid formula. Optimized mefenamic acid SNEDDS formula consisted of 20% capryol-90, 31.62% polysorbate-80, and 48.38% PEG-400. Characterization study of Optimized mefenamic acid SNEDDS formula showed improvement of drug content (102.820 ± 4.950)%, emulsification time (421.015 ± 1.290) second, and viscosity (0.927 ± 0.017) mm2/s 30oC. One way ANOVA statistical analysis result of optimal formula SNEDDS (105.210 ± 4.425)% of drug content, commercial generic caplet (0.917 ± 0.094)%, and mefenamic acid powder capsule (10.446 ± 0,333)% gave significant value (sig*) below than 0.05. Optimal formula proved that SNEDDS can significantly increase mefenamic acid dissolution of pH 7.4 (ileum fluid). The optimal formula of mefenamic acid SNEDDS successfully formed an uniformity droplet size (PDI 0.18) with mean size 241.9 nm and the surface charge has a value of -16.5 mV respectively.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/135
10.26554/sti.2018.3.4.164-172
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 164-172
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/135/88
Copyright (c) 2018 Mardiyanto Mardiyanto; Najma Annuria Fithri, Martina Tandry
oai:ojs2.sciencetechindonesia.com:article/136
2018-10-26T23:59:49Z
jsti:ART
On the Influence of Enso And IOD on Rainfall Variability Over The Musi Basin, South Sumatra
Mardiansyah, Wijaya
Setiabudidaya, Dedi
Khakim, M. Yusup Nur
Yustian, Indra
Dahlan, Zulkifli
Iskandar, Iskhaq
ENSO, Indian Ocean Dipole; Musi Basin, rainfall variability; sea surface temperature.
The southern Sumatera region experiences one rainy season and one dry season in a year associated with seasonal change in monsoonal winds. The peak of rainy season is occurring in November-December-January during the northwest monsoon season, while the dry season comes in June-July-August during the southeast monsoon season. This study is designed to evaluate possible influence of the coupled ocean-atmospheric modes in the tropical Indo-Pacific region, namely the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) on the rainfall variability over the catchment area of the Music Basin, South Sumatera. The ENSO and IOD occurrences were reflected by the variability of sea surface temperature (SST) in the tropical Pacific and Indian Ocean, respectively. During El Niño and/or positive IOD episode, negative SST anomalies cover the eastern tropical Indian Ocean and western tropical Pacific including the Indonesian seas, leading to suppress convective activities that result in reduce precipitation over the maritime continent. The situation is reversed during La Niña and/or negative IOD event. The results revealed that the high topography area (e.g. Bukit Barisan) was shown to be instrumental to the pattern of rainfall variability. During the 2010 negative IOD co-occurring with La Niña event, the rainfall was significantly increase over the region. This excess rainfall was associated with warm SST anomaly over the eastern tropical Indian Ocean and the Indonesian seas. On the other hand, extreme drought event tends to occur during the 2015 positive IOD simultaneously with the occurrence of the El Niño events Investigation on the SST patterns revealed that cold SST anomalies covered the Indonesian seas during the peak phase of the 2015 positive IOD and El Niño event.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/136
10.26554/sti.2018.3.4.157-163
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 157-163
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/136/87
Copyright (c) 2018 Wijaya Mardiansyah, Dedi Setiabudidaya, M. Yusup Nur Khakim, Indra Yustian, Zulkifli Dahlan, Iskhaq Iskandar
oai:ojs2.sciencetechindonesia.com:article/137
2019-01-27T13:37:15Z
jsti:ART
Antioxidant Activity Analysis and Standardization of Parkia speciosa (Petai) Pods Ethanol Extract
Fithri, Najma Annuria
Fitrya, Fitrya
Shabrina, Tia
Yulanri, Diva
Parkia speciosa, petai pod, standardization, total phenolic, total flavonoid, antioxidant
Parkia speciosa (petai) pods are rarely used and considered as waste despite their phenolic and flavonoid content. Phenolic and flavonoid content in plants are known to exhibit antioxidant activity. Antioxidants are known to potentially act agains radical and mediate the damage by structural stabilization. This research was conducted to analyze the antioxidant potential of petai pods using DPPH method. Analysis showed the IC50 of petai pods ethanolic extract was 75.72 ppm, which indicate strong acting antioxidant. Standardization of extracts were determined to manage the quality of extract, including the analysis of density, water content, ash values, and quantification of total phenolic and flavonoid content. Research outcome indicate the extract retain its quality during storage and use which confrmed to standardization requirements of water content and ash values. Total phenolics and flavonoid obtained were 272.45 mg/gGAE and 243.2029 mg/gQE respectively. Based from this research, petai pods ethanolic extract present strong antioxidant activity which was contributed by high existing content of flavonoid and phenolic compounds.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/137
10.26554/sti.2019.4.1.5-10
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January; 5-10
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/137/97
Copyright (c) 2019 Najma Annuria Fithri, Fitrya Fitrya, Tia Shabrina, Diva Yulanri
oai:ojs2.sciencetechindonesia.com:article/138
2018-10-26T23:59:49Z
jsti:ART
A Adsorbent of Chitosan Linked by Methylene Bridge and Schiff Base of 4,4-diaminodiphenyl Ether –vanillin : Synthesis, Characterization and Its Application After Reacted by Zn(II) Ion as Antibacterial Agent
Fatoni, Ahmad
Hariani, Poedji Loekitowati
Hermansyah, Hermansyah
Lesbani, Aldes
Keywords : modified chitosan, antibacterial agent
The synthesis chitosan linked by methylene bridge-Schiff base of 4,4-diaminodiphenyl ether-vanillin (modified chitosan adsorbent) has been studied. The aims of this research were modification of chitosan with Schiff base of 4,4-diaminodiphenyl ether-vanillin and formaldehyde and its application as antibacterial agent after used as an adsorbent of Zn(II) ion. Characterization of modified chitosan adsorbent was conducted using FTIR spectroscopy. Process of adsorption were conducted at 0.15 g of modified chitosan adsorbent reacted by concentration of Zn(II) ion solution (pH 6, 150 mg/L, 50 mL), contact time at 150 min. and at room temperature (280C). Modified chitosan adsorbent after reacted by Zn(II) ion solution as antibacterial agent with paper disk method. The result showed that chitosan can be modified with Schiff base of 4,4-diaminodiphenyl ether-vanillin and formaldehyde to form chitosan linked methylene bridge and Schiff base of 4,4-diaminodiphenyl ether-vanillin. Antibacterial of chitosan and modified chitosan adsorbent were higher than modified chitosan adsorbent after reacted by Zn(II) ion.
Keywords : modified chitosan, antibacterial agent
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/138
10.26554/sti.2018.3.4.173-177
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 173-177
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/138/89
Copyright (c) 2018 Ahmad Fatoni, Poedji Loekitowati Hariani, Hermansyah Hermansyah, Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/141
2018-10-26T23:59:49Z
jsti:ART
Potential of Anabaena Azollae Extract as Antimicrobial Agent For Paddy Crop Disease
Gofar, Nuni
Diana, Andi
Setianingsih, Eka
Anabaena azolae, Azolla microphylla, Azolla pinnata, antimicrobe, rice crop
The research objective was to test antimicrobial activity from compound produced by A. azollae which symbiosis with Azolla sp. toward microbial test of X. oryzae and Pyricularia oryzae as cause of disease on paddy crop. Sampling of Azolla which symbiosis with A. azollae was done in Azolla cultivation pond at Faculty of Agriculture, Sriwijaya University. The available Azolla was consisted of two types, i.e. Azolla pinnata and Azolla mycrophiylla. The extraction of A. azollae from Azolla leaves was done by method of Ultrasound Assisted Extraction (UAE) using ethyl ester solvent and maseration method using methanol solvent. Test media for bacteria and fungus respectively are Mueller Hilton Agar (MHA) and Sabouraud Dextrose Agar (SDA). The diameter of produced clear zone is an indication of extract’s inhibitory power toward bacteria or fungus. The different of inhibitory zone diameter is compared by using t-test. Analysis of active compounds on Anabaena azollae extract was done by using HPLC. Ethyl acetate or methanol extract of A. azollae which symbiosis with A. pinnata or A. microphylla was capable to inhibit the growth of X. oryzae bacterium and P. oryzae fungus. The dominant compounds containing within extract with probability more than 60% and area of more than 10% are consisted of phytol, hexadecanoate acid and 2-(tert-butyl)-4,6-dimethyl phenol.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/141
10.26554/sti.2018.3.4.183-188
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 183-188
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/141/91
Copyright (c) 2018 Nuni Gofar, Andi Diana, Eka Setianingsih
oai:ojs2.sciencetechindonesia.com:article/148
2019-01-27T13:37:15Z
jsti:ART
The Effect of Rice Husk Addition as Additive Materials on the Characterization of Ceramic Membrane and Their Application on Water River Treatment Process
Sisnayati, Sisnayati
Komala, Ria
Suryani, Retno
ceramic membrane, rice husk, river water treatment, clean water production, metals reduction
This study aims to study how the effect of adding rice husk additives to the characteristics of ceramic membranes with various variations of membrane-forming component composition in terms of surface morphology and pore size of the membrane produced. This research is expected to be used by the community as an alternative treatment of river water into clean water. In this study, the variables studied were the composition of the membrane constituent namely clay, iron powder and rice husk as an additives. The ceramic membrane was designed in the form of a tube, made from a mixture of clay, iron powder and rice husk with a diameter of 5 cm, an outer diameter of 6 cm, a thickness of 1 cm and a length of 25 cm. Housing membrane was made of glass fiber with an outer diameter of 9 cm, an inner diameter of 8.5 cm and a length of 30 cm. Making ceramic membranes were from clay, iron powder and rice husk with a ratio of 87.5%, 2.5%, 10%, 77.5%, 2.5%, 20% and 77.5%, 2.5%, 15%. The river water was treated by flowing to the complete separation process. It was taken every 15 minutes, 30 minutes, 45 minutes, 60 minutes, 75 minutes, 90 minutes. Every sampling, the permeate volume was determined. Permeat events were analyzed for chemical parameters in the form of iron (Fe), Manganese (Mn) and Zinc (Zn). Based on the SEM-EDS analysis on the ceramic membrane produced shows that the membrane was classified in the microfiltration membrane group with a random and asymmetrical pore size and structure. According to the BET analysis on ceramic membranes shows that the best ceramic membrane produced in this study is C ceramic membrane with a clay composition of 87.5%; 10% of rice husk; and 2.5% of iron powder with a pore size of 2.8 μm and a large surface area of 45.38 m2/g. The difference in pressure of 2 bars gives the best results in reducing levels of contaminant compounds contained in river water with a percentage of Fe reduction of 92.18%, Mn of 89.23%, and Zn of 99.80%.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/148
10.26554/sti.2019.4.1.11-17
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January; 11-17
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/148/103
Copyright (c) 2019 Sisnayati Sisnayati, Ria Komala, Retno Suryani
oai:ojs2.sciencetechindonesia.com:article/150
2019-01-27T13:37:15Z
jsti:ART
Effect of Dilute Acid - Alkaline Pretreatment on Rice Husk Composition and Hydrodynamic Modeling with CFD
Novia, Novia
Pareek, Vishnu K
Hermansyah, Hermansyah
Jannah, Asyeni Miftahul
Alkaline Pretreatment, CFD Modeling, Dilute Acid pretreatment, Lignin, Rice Husk
The high cellulosic content of rice husk can be utilized as a feedstock for pulp and biofuel. Pretreatment is necessary to break the bonds in the complex lignocellulose matrices addressing the cellulose access. This work aims to utilize the rice husk using dilute acid and alkaline pretreatment experimentally and CFD modeling. The study consists of three series of research. The first stage was the dilute acid pretreatment with sulfuric acid concentration of 1% to 5% (v/v) at 85°C for 60 minutes, and alkaline pretreatment with NaOH concentration of 1% to 5% (w/v) at 85oC for 30 minutes separately. The second stage used the combination of both pretreatment. Moreover the last stage of research was hydrodynamic modeling of pretreatment process by CFD (ANSYS FLUENT 16). The experimental results showed that the lowest lignin content after acid pretreatment was about 10.74%. Alkaline pretreatment produced the lowest lignin content of 4.35%. The highest cellulose content was 66.75 % for acid-alkaline pretreatment. The lowest content of lignin was about 6.09% for acid-alkaline pretreatment. The lowest performance of alkaline pretreatment on HWS (hot water solubility) of about 7.34% can be enhanced to 9.71% by using a combination alkaline-acid. The combined pretreatments result hemicellulose of about 9.59% (alkaline-acid) and 9.27% (acid-alkaline). Modeling results showed that the mixing area had the minimum pressure of about -6250 Pa which is vortex leading minimum efficiency of mixing. The rice husk flowed upward to the upper level and mixed with reagent in the perfect mixing.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/150
10.26554/sti.2019.4.1.18-23
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January; 18-23
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/150/98
Copyright (c) 2019 Novia Novia, Vishnu K Pareek, Hermansyah Hermansyah, Asyeni Miftahul Jannah
oai:ojs2.sciencetechindonesia.com:article/151
2018-10-26T23:59:49Z
jsti:ART
Kinetic and Thermodynamic Adsorption of Cr(VI) onto Dried Oscillatoria Splendida in Aqueous Solution
Mohadi, Risfidian
Setiawan, Doni
Zulkifli, Hilda
Oscillatoria Splendida, Cr(VI), adsorption, algae swamp
Kinetic and thermodynamic adsorption study of Cr(VI) ion in aqueous solutions by dried Oscillatoria Splendida biomass was investigated in the batch system. The Oscillatoria Splendida was isolated and cultured from algae swamp ecosystem in South Sumatera. The adsorption properties of Cr(VI) onto dried Oscillatoria Splendida biomass was studied by the influences of contact time, initial Cr(VI) ion concentration and temperature of reaction. The experimental results were the rate of adsorption followed the second-order kinetic model with the rate of reaction k2 is 0.00181 mg g-1 min-1 and the adsorption thermodynamic agree to the Langmuir’s model with amount of Cr(VI) removed from aqueous solution increased with increasing Cr(VI) concentration with the higher adsorption energy was 8.46 kJ/mol at 50 °C.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/151
10.26554/sti.2018.3.4.195-198
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 195-198
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/151/93
Copyright (c) 2018 Risfidian Mohadi, Doni Setiawan, Hilda Zulkifli
oai:ojs2.sciencetechindonesia.com:article/152
2018-10-26T23:59:49Z
jsti:ART
Adsorption of Cobalt (II) on Layered Double Hydroxides (Mg/Al and Ca/Al) In Aqueous Medium : Kinetic and Thermodynamic Aspect
Palapa, Neza Rahayu
Taher, Tarmizi
Said, Muhammad
Mohadi, Risfidian
Lesbani, Aldes
layered double hydroxides, cobalt (II), adsorption.
Layered double hydroxides Mg/Al and Ca/Al has been synthesized by co-precipitation method with molar ratio M2+:M3+ (3:1) at pH 10. The synthesized materials were characterized by XRD and FTIR. The materials were used as adsorbent for the removal Cobalt (II) in aqueous solution. The adsorption experiments were studied through some variables adsorption such as variation of contact time, variation of temperature and variation of initial concentration. Kinetic parameters was obtained from variation of contact time. Data was analyzed by pseudo-first-order and pseudo-second-order kinetics models in linear analyses. The kinetic studies showed that the adsorption process more fitted by pseudo-second-order than pseudo-first-order based on coefficient correlation. Isotherm parameters was calculated using Langmuir and Freundlich isotherm models. The adsorption process was spontaneous and endothermic.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/152
10.26554/sti.2018.3.4.189-194
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October; 189-194
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/152/92
Copyright (c) 2018 Neza Rahayu Palapa, Tarmizi Taher, Muhammad Said, Risfidian Mohadi, Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/153
2018-10-26T23:59:49Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/153
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/153/94
Copyright (c) 2018 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/154
2018-10-26T23:59:49Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2018-10-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/154
Science and Technology Indonesia; Vol. 3 No. 4 (2018): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/154/95
Copyright (c) 2018 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/156
2019-01-27T13:37:15Z
jsti:ART
Antihyperlipidemic Activity of Ethanol Extract Mindi’s Leaves (Melia azedarach Linn.) in Male Wistar Rats Induced Propiltiouracil
Herlina, Herlina
Untari, Budi
Solihah, Indah
Santia, Merie
Melia azedarach Linn., antihyperlipidemia, total cholesterol, low density lipoprotein (LDL)
Mindi’s leaves (Melia azedarach Linn.) is an Indonesian medicinal plant that used as traditional medicine. Mindi leaves contains some secondary metabolites which have potency to decreased total cholesterol and LDL level. The study purposed to know antihyperlipidemic effect of ethanol extract of mindi’s leaves (Melia azedarach Linn.) seen from total cholesterol, and LDL in male albino rats. Male wistar albino rats were divided into 5 groups, negative control group (sodium CMC 0.5%), positive control group (simvastatin 0.193 mg/200 gBW), group I (ethanol extract mindi’s leaves with dosage 300 mg/200 gBW), group II (ethanol extract mindi’s leaves with dosage 600 mg/200 gBW), and group III (ethanol extract mindi’s leaves with dosage 1200 mg/200 gBW). The rats were given high-fat supplement and propylthiouracil for 15 days to increase cholesterol, and the extract was given for the next 15 days. Average cholesterol level, LDL, and body weight after induction was 90.28 mg/dL, 31.09 mg/dL, and 222.32 g. The result showed ethanol extract mindi’s leaves could decreased total cholesterol level and LDL level with % decreased in total cholesterol (%PDTC) and % decreased in LDL (%PDLDL) of group I is 37.78% and 35.57%, group II is 45.99% and 40.39%, and for group III is 56.29% and 52.42%. The result showed that ethanol extract of mindi’s leaves has antihyperlipidemic activity and significantly different from negative control (p>0.05). Based on the percentage relation of decreased total cholesterol and LDL levels to dose, then the effective dose 50 (ED50) value of ethanol extract mindi’s leave is 869 mg/200 gBW for total cholesterol and for LDL reduction level is 1086.84 mg/200 gBW
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/156
10.26554/sti.2019.4.1.24-30
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January; 24-30
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/156/100
Copyright (c) 2019 Herlina Herlina, Budi Untari, Indah Solihah, Merie Santia
oai:ojs2.sciencetechindonesia.com:article/158
2019-01-27T13:37:15Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/158
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/158/101
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/159
2019-01-27T13:37:15Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-01-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/159
Science and Technology Indonesia; Vol. 4 No. 1 (2019): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/159/102
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/160
2019-04-27T08:53:43Z
jsti:ART
Evaluating the Technical Feasibility of Retention Basins for Flood Control in Palembang City
Alia, Febrinasti
Al Amin, Muhammad Baitullah
Aditya, Bimo Brata
Indriyati, Citra
Retention basin, assessment, flood control.
Flood control is one of the prevention methods which involves various engineering sciences and is unique. One of structural flood control methods is retention basin with the goal of containing a certain storm event flow volume and obtaining a specific peak flow reduction. This paper’s objective is to describe how to assess the performance of retention basin physical components quantitatively on seven retention basins in Palembang City. The reference and the parameter used in this research are referred to Drainage Systems Assessment Design (Vadlon, 2011) that is based on Standard Procedure of Retention Basins and Polders Construction according to Public Works Ministry of Cipta Karya Directorate General and the Regulation of Public Work Ministry No.32/PRT/M/2007.
The result of the assessment is that there are three retention basins which are in good condition, namely Kambang Iwak Besak (63,9%), Simpang Polda (60,34%), and Kambang Iwak Kecil (56,8%); meanwhile the other four basins are in bad conditions, namely RS. Siti Khodijah (43,01%), Palembang Icon (41,93%), Kemang Manis (7,03%), and Brimob (0,94%).
Therefore, the assessment of the retention basins towards its effectiveness on flood controlling and handling priority level is done by hydraulic modeling simulations and GIS. 4. Based on the inundation priority assessment of simulated flood depth and duration, it can be inferred that the retention basin of Kambang Iwak Besak, Kambang Iwak Kecik, Palembang Icon, RS Siti Khodijah, and Kemang Manis have low priority handling level. Meanwhile, Brimob and Simpang Polda retention basins have high priority handling level.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/160
10.26554/sti.2019.4.2.40-51
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April; 40-51
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/160/106
Copyright (c) 2019 Febrinasti Alia, Muhammad Baitullah Al Amin, Bimo Brata Aditya, Citra Indriyati
oai:ojs2.sciencetechindonesia.com:article/162
2019-04-27T08:53:43Z
jsti:ART
Counting the sum of cubes for Lucas and Gibonacci numbers
Wamiliana, Wamiliana
Suharsono, Suharsono
Kristanto, Paustinus Edi
Fibonacci number
Lucas number
Gibonacci number
identity
sum of cubes
Lucas and Gibonacci numbers are two sequences of numbers derived from a welknown numbers, Fibonacci numbers. The difference between Lucas and Fibonacci numbers only lies on the first and second elements. The first element in Lucas numbers is 2 and the second is 1, and nth element, n ≥ 3 determined by similar pattern as in the Fibonacci numbers, i.e : Ln = Ln-1 + Ln-2. Gibonacci numbers G0 , G1 ,G2 , ...; Gn = Gn-1 + Gn-2 are generalized of Fibonacci numbers, and those numbers are nonnegative integers. If G0 = 1 and G1 = 1, then the numbers are the wellknown Fibonacci numbers, and if G0 = 2 and G1 = 1, the numbers are Lucas numbers. Thus, the difference of those three sequences of numbers only lies on the first and second of the elements in the sequences. For Fibonacci numbers there are quite a lot identities already explored, including the sum of cubes, but there have no discussions yet about the sum of cubes for Lucas and Gibonacci numbers. In this study the sum of cubes of Lucas and Gibonacci numbers will be discussed and showed that the sum of cubes for Lucas numbers is and for Gibonacci numbers is
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/162
10.26554/sti.2019.4.2.31-35
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April; 31-35
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/162/104
Copyright (c) 2019 Wamiliana Wamiliana, Suharsono Suharsono, Paustinus Edi Kristanto
oai:ojs2.sciencetechindonesia.com:article/166
2019-04-28T02:19:16Z
jsti:ART
Synthesis and Characterization of Zn/Al, Zn/Fe, and Zn/Cr Layered Double Hydroxides: Effect of M3+ ions Toward Layer Formation
Palapa, Neza Rahayu
Saria, Yosi
Taher, Tarmizi
Mohadi, Risfidian
Lesbani, Aldes
layered double hydroxides
LDHs
co-precipitation
Zn/Al LDHs
Zn/Fe LDHs
Zn/Cr LDHs
Layered double hydroxides are composed by substitution of metal cation divalent and trivalent. Metal cation divalent and trivalent can be changed. In this work, effect metal cation trivalent (M3+) toward layer formation were studied. Synthesis of LDHs has used co-precipitation methods with molar ratio 3:1 and kept pH at 10. The result of synthesis was characterized by X-ray Diffraction (XRD) and Fourier Transform Infrared (FT-IR) analyses.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/166
10.26554/sti.2019.4.2.36-39
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April; 36-39
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/166/105
Copyright (c) 2019 Neza Rahayu Palapa
oai:ojs2.sciencetechindonesia.com:article/169
2019-08-02T22:43:44Z
jsti:ART
Comparison of Two Priors in Bayesian Estimation for Parameter of Weibull Distribution
Yanuar, Ferra
Yozza, Hazmira
Rescha, Ratna Vrima
This present study purposes to conduct Bayesian inference for scale parameters, denoted by , from Weibull distribution. The prior distribution chosen in this study is the prior conjugate, that is inverse gamma and non-informative prior, namely Jeffreys’ prior. This research also aims to study several theoretical properties of posterior distribution based on prior used and then implement it to generated data and make comparison between both Bayes estimator as well. The method used to evaluate the best estimator is based on the smallest Mean Square Error (MSE). This study proved that Bayes estimator using conjugate prior produces parameter value that is better estimate than the non-informative prior since it produces smaller MSE value, for condition scale parameter value more than one based on analytic and simulation study. Meanwhile for scale parameter value less than one, it could not yielded the good estimated value.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/169
10.26554/sti.2019.4.3.82-87
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July; 82-87
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/169/117
Copyright (c) 2019 Ferra Yanuar, Hazmira Yozza, Ratna Vrima Rescha
oai:ojs2.sciencetechindonesia.com:article/171
2019-04-27T11:30:52Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/171
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/171/109
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/172
2019-04-27T11:32:43Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-04-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/172
Science and Technology Indonesia; Vol. 4 No. 2 (2019): April
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/172/110
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/174
2019-08-02T22:43:44Z
jsti:ART
The submicron particles FORMULATION OF IONIC-GELATION SUBMICRON PARTICLES LOADING EXTRACT PAPAYA LEAVES (Carica papaya L.) WITH LACTIC ACID ISOLATES: Evaluation of submicron particles for pharmaceutical application
Mardiyanto, Mardiyanto
Untari, Budi
Fithri, Najma Annuria
Sandi, Sofia
Mawaddah, Zahrul
Ionic-gelation, submicron-particles, Carica papaya L., lactic acid isolates
A study regarding ionic-gelation submicron particle of papaya leaves (Carica papaya L.) extract with lactic acid of weeds potentially for antidiarrhea has been conducted. Preparation of papaya leaves ethanolic extract and lactic acid isolate into particles was done by ionic gelation method. This study aimed to determine: the major compound of extract, the total quercertine of extract, the percent value of encapsulation efficiency of the optimum formula which was varied by (CaOH)2 of the three formulas, and physical properties of particles. Formula 1 was using (CaOH)2 of 12.5 gram; formula 2 (CaOH)2 of 17,5 gram; formula 3 (CaOH)2 of 22.5 gram. The results showed formula 1 as the optimum formula that has the highest %EE. The average %EE values of F1; F2; F3 respectively were 80,82%; 80,41%; 80,31%. The results of particle characterization using the PSA in the optimum formula produced particle size values with an average of 253.6 nm, PDI of 0.218, and zeta potential +8 mV respectively.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/174
10.26554/sti.2019.4.3.77-81
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July; 77-81
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/174/115
Copyright (c) 2019 Mardiyanto Mardiyanto
oai:ojs2.sciencetechindonesia.com:article/179
2019-08-02T22:43:44Z
jsti:ART
A Cytotoxic Activity of Tahongai (Kleinhovia hospita Linn.) Leaves Extracts Using Brine Shrimp Lethality Test
Solihah, Indah
Herlina, Herlina
Rasyid, Riana Sari Puspita
Suciati, Tri
Khairunnisa, Khairunnisa
Kleinhovia hospita Linn., cytotoxic, BSLT
Tahongai (Kleinhovia hospita Linn.) leaves had been known contain alkaloids, flavonoids, saponins, steroids, and tannins. At Komering, South Sumatera tribe, tahongai leaves had been known to treat tumor, cancer, polyps, acne, and dysmenorrhea. The study of cytotoxic activity of tahongai bark and stem were done. This study aims to determine the cytotoxic activity of tahongai leaves extracts using BSLT method. Tahongai leaves were extracted using gradual maceration with n-hexane, ethyl acetate, and ethanol 96%. Each extract was tested cytotoxic activity towards Artemia salina L. larvae. The yield of n-hexane, ethyl acetate, and ethanol extracts are 2,686%, 7,033%, and 7,933% respectively. Ethanol extract of tahongai leaves had the best cytotoxic activity with lethality value 76,667% at 500ppm. Statistical analysis with two way ANOVA showed extract and concentration had a significant (p<0,05) effect on larvae lethality percentage.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/179
10.26554/sti.2019.4.3.60-63
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July; 60-63
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/179/112
Copyright (c) 2019 Indah Solihah, Herlina Herlina, Riana Sari Puspita Rasyid, Tri Suciati, Khairunnisa Khairunnisa
oai:ojs2.sciencetechindonesia.com:article/181
2019-08-02T22:43:44Z
jsti:ART
Physical Interaction Of Chitosan-Alginate Entrapping Extract Of Papaya Leaf And Formation Of Submicron Particles Dosage Form: New Dossage Form to Inhibit The Dengue Diseases
Untari, Budi
Wijaya, Dina Permata
Mardiyanto, Mardiyanto
Herlina, Herlina
Angraeni, Via
Firana, Ario
Interaction, chitosan-alginate, papaya leaf, submicron-particles
Research on physical interaction of chitosan-alginate entrapping extract of papaya leaf (Carica papaya L) into submicron particles formation has been performed. Preparation of papaya leaf extract into submicron particle dosage form of chitosan and sodium alginate polymer using ionic gelation method aimed to increase the solubility of extract. Submicron particles consisting of papaya leaf extract, chitosan, sodium alginate and CaCl2 were combined using variation of stirrer speed of 500, 750, and 1000 RPM. The optimum formula obtained has a speed of 1000 RPM with the percent EE value of 71.90%. The results of submicron particles characterization such as diameter and particle size distribution (PDI) using particle size analyzer (PSA) tools were 189.2 nm and 0.330. The results of XRD revealed the changes of type of crystalinity form to amorphous on submicron particles. The results of FTIR revealed the physical interaction without shifting of wave number of carbonyl, amine, and hydroxyl group which indicated that there were no chemical interactions occurred. These data indicated that papaya extract can be formulated into submicron particles of chitosan-alginate polymer.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/181
10.26554/sti.2019.4.3.64-69
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July; 64-69
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/181/113
Copyright (c) 2019 Budi Untari, Dina Permata Wijaya, Mardiyanto Mardiyanto, Herlina Herlina, Via Angraeni, Ario Firana
oai:ojs2.sciencetechindonesia.com:article/182
2019-08-02T22:43:44Z
jsti:ART
Removal of Anionic Direct Dye Using Zn/Al, Zn/Fe and Zn/Cr Layered Double Hydroxides Toward Interlayer Distance
Palapa, Neza Rahayu
Taher, Tarmizi
Mohadi, Risfidian
Lesbani, Aldes
In order to minimize harmful effect of synthetic dye (direct yellow and direct violet) the capacity of Zn/Al, Zn/Cr and Zn/Fe layered double hydroxides of these contaminant was studied in this work. Batch adsorption experiment was conduct to investigate the effect of various operating parameters such as contact time, initial dye concentration and adsorption temperature in order to provide optimal condition in removal synthetic dye. Based on result, the sorption of direct dye onto LDHs followed pseudo-second-order rate model. The equilibrium adsorption data for both direct dye was fitted Freundlich isotherm model
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/182
10.26554/sti.2019.4.3.70-76
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July; 70-76
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/182/114
Copyright (c) 2019 Neza Rahayu Palapa, Tarmizi Taher, Risfidian Mohadi, Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/183
2019-10-17T15:36:44Z
jsti:ed
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/183
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/183/118
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/184
2019-08-02T22:43:44Z
jsti:ed
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-07-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/184
Science and Technology Indonesia; Vol. 4 No. 3 (2019): July
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/184/116
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/187
2020-06-11T15:50:49Z
jsti:ART
Determination The Coefficient of Restitution in Object as Temperature Function in Partially Elastic Collision Using Phyphox Application on Smartphone
hikmatiar, hamzarudin
Ishafit, Ishafit
Wahyuni, Mentari Eka
coefficient of restitution ,smartphone, phyphox application
This research aims to determine the coefficient of restitution in object experiencing partially elastic collision when the object falls free using the phyphox application on smartphone. In terms of experiment, this experiment was carried out five times with different temperature. The smartphone is connected on PC through the same wifi network or using tethering by entering the search address that available on phyphox application. After that, the smartphone placed on the board that used as a base when the object dropped, then the object released from the certain height. Data collecting process started by running the phyphox application through a PC to collect the measurement data. The data collected on smartphone is exported to Ms. Excel to fit the data and then the results are plotted in graphical form. The result of the analysis shows the coefficient of restitution value of the object that had variations based on experiment with each temperatures at 32 oC, 28 oC, 24 oC, 20 oC 18 oC and the coefficient of restitution values are 0.889 ± 0.006, 0.890 ± 0.008, 0.891 ± 0.003, 0.892 ± 0.003 and 0.893 ± 0.003. The result of research shows that the lower of the temperature so theres increasing on the coefficient of restitution. So that the coefficient of restitution has avarage’s value is 0.891±0.002.
Keywords: coefficient of restitution ,smartphone, phyphox application
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/187
10.26554/sti.2019.4.4.88-93
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October; 88-93
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/187/120
Copyright (c) 2019 hamzarudin hikmatiar
oai:ojs2.sciencetechindonesia.com:article/189
2020-06-11T15:51:59Z
jsti:ART
The Branch and Cut Method for Solving Capacitated Vehicle Routing Problem (CVRP) Model of LPG Gas Distribution Routes: -
Yuliza, Evi
Puspita, F.M
Capacitated Vehicle Routing Problem, Branch and Cut
Capacitated Vehicle Routing Problem (CVRP) is a problem that discusses how to choose several routes that must be passed by a number of transport vehicles in the process of distributing goods that combine customer demand with regard to transport capacity. CVRP designs an optimal delivery route where each vehicle only takes one route, each vehicle has the same characteristics, each customer has a request and there is only one depot. In this paper, two CVRP models were formulated. Formulation of the first CVRP model without regard to vehicle loads and vehicles returned to the depot. The second CVRP model formulation takes into account the vehicle load and the vehicle does not return to the depot. Determination of LPG gas distribution routes is completed using the Branch and Cut method.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/189
10.26554/sti.2019.4.4.105-108
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October; 105-108
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/189/122
Copyright (c) 2019 Yuliza, Evi
oai:ojs2.sciencetechindonesia.com:article/191
2020-06-11T15:51:10Z
jsti:ART
Effectiveness of Herbal Extract (Piper retrofractum, Curcuma aeruginosa, and Curcuma zanthorrhiza) as Immunomodulator in Non-Specific Immunity System of Tiger Grouper (Epinephelus fuscoguttatus) against Infection from Vibrio alginolyticus and Vibrio parah
setyati, wilis
Subagiyo, Subagiyo
Pramesti, Rini
Pringgenies, Delianis
The success of aquaculture is one of the supporting factors in food sustainability, one of such is the aquaculture of tiger grouper (Epinephelus fuscoguttatus). The main issue of tiger grouper (Epinephelus fuscoguttatus) aquaculture is disease infestation caused by viruses, microbes, and fungi (1). One of the technologies to control such infestation is the immunostimulant of non-specific immunity. Traditional herbs such as Piper retrofractum, Curcuma aeruginosa, and Curcuma zanthorrhiza have been proven to enhance the immunity system. This study aims to determine the optimal dosage of herb extract (Piper retrofractum, Curcuma aeruginosa, and Curcuma zanthorrhiza) to strengthen non-specific immunity of tiger grouper (Epinephelus fuscoguttatus), to record data on total leukocyte count and phagocytosis activity in the subject against pathogenic infection from Vibrio alginolyticus and Vibrio parahaemolyticus, and on the side effects of the application of the herbal extracts on meat quality (organoleptic) of tiger grouper (Epinephelus fuscoguttatus)(2). The study was carried out by experimental method using random design with 3 repetitions. The experiment was performed in plastic tanks using flow through system with siphon construction. Steps performed include: Herb sample collection, herb samples extraction, herb extract supplementation into artificial food, dose optimization of herb extract application, challenge test, and side effect test (3). The result shows that treatment with 1% Piper retrofractum, 0.5% Curcuma aeruginosa, and 1% Curcuma zanthorrhiza herb extract increased total leukocyte count and phagocytosis activity in tiger grouper (Epinephelus fuscoguttatus). Organoleptic test of all three treatments indicated similar results, with solid texture and bland flavor. Challenge test against pathogenic infection from V. alginolyticus and V. parahaemolyticus found that the treatment reduced the mortality rate to 0%. Based on the results of this study, Piper retrofractum, Curcuma aeruginosa, and Curcuma zanthorrhiza were proven to be viable immunomodulator on non-specific immunity system in tiger grouper (Epinephelus fuscoguttatus) fish against infection from Vibrio alginolyticus and Vibrio parahaemolyticus.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/191
10.26554/sti.2019.4.4.94-100
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October; 94-100
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/191/119
Copyright (c) 2019 marwa irfan, wilis setyati
oai:ojs2.sciencetechindonesia.com:article/192
2020-02-04T22:05:32Z
jsti:ART
Synthesis and Characterization Chitosan-ZnO nanoparticle and Its Application as Antibacterial Agent of Staphylococus aureus ATCC 25923
Fatoni, Ahmad
Munarsih, Ensiwi
Asmadi, Kadek
Hidayati, Nurlisa
chitosan-ZnO nanoparticle, antibacterial agent
The synthesis of modified chitosan has been studied. The aims of this research were modification of chitosan with ZnO nanoparticle to form chitosan-ZnO nanoparticle and its application as antibacterial agent of Staphylococus aureus. Characterization of modified chitosan was conducted using FTIR spectroscopy and X-Ray diffractometer. ZnO nanoparticle was synthesized by leaf extract of Sirih hijau (piper betle L) and zinc acetate dihydrate. Modified chitosan was synthesized by chitosan and ZnO nanoparticle. Modified chitosan solution can act as antibacterial agent with paper disk method. The result showed that chitosan can be modified with ZnO nanoparticle and detected at wave number of 3427 cm−1. The crystalline size of ZnO nanoparticle is 16.47 nm. The average inhibition zone of chitosan-ZnO nanoparticle at concentration 10.000, 5.000 and 2.500 ppm are 28.87 ± 0.4 ; 24.93 ± 0.15 and 19.35 ± 0.3 mm respectively.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/192
10.26554/sti.2020.5.1.1-5
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January; 1-5
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/192/128
Copyright (c) 2020 Ahmad Fatoni
oai:ojs2.sciencetechindonesia.com:article/195
2020-06-11T15:37:31Z
jsti:ART
oai:ojs2.sciencetechindonesia.com:article/196
2020-06-11T15:51:35Z
jsti:ART
Kinetic Adsorption of Direct Yellow Onto Zn/Al and Zn/Fe Layered Double Hydroxides
Palapa, Neza Rahayu
Rahayu, Bakri Rio
Taher, Tarmizi
Lesbani, Aldes
Mohadi, Risfidian
Zn/Al and Zn/Fe layered double hydroxides has successfully synthesized by co-precipitation methods with molar ration 3:1. The samples were characterized using X-Ray Diffraction, Fourier Transform Infrared Spectroscopy and Surface Area using BET method. In this study, Zn/Al and Zn/Fe layered double hydroxides were used to remove direct yellow dye in aqueous solution. The experiments were carried out time variations with the aim of observing the kinetic studies. The results showed that the adsorption of direct yellow onto Zn/Al and Zn/Fe layered double hydroxides based on co-efficient correlation kinetic models more fit using pseudo-second-order than pseudo-first-order.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/196
10.26554/sti.2019.4.4.101-104
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October; 101-104
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/196/121
Copyright (c) 2019 Neza Rahayu Palapa, Bakri Rio Rahayu, Tarmizi Taher, Aldes Lesbani, Risfidian Mohadi
oai:ojs2.sciencetechindonesia.com:article/197
2019-10-30T11:57:15Z
jsti:ed
oai:ojs2.sciencetechindonesia.com:article/198
2019-10-30T11:57:21Z
jsti:ed
oai:ojs2.sciencetechindonesia.com:article/199
2020-06-11T15:49:46Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/199
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/199/126
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/200
2020-06-11T15:49:46Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2019-10-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/200
Science and Technology Indonesia; Vol. 4 No. 4 (2019): October
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/200/127
Copyright (c) 2019 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/201
2020-02-04T22:05:32Z
jsti:ART
The Effect of Addition on Pumice and Fiber on Compressive and Fluxural Strength Precast Lightweight Concrete: -
Indrayani, Indrayani
Herius, Andi
Hasan, Arfan
Mirza, Ahmad
Fumice, Fiber, Precast, Lightweight Concrete
Most of the construction uses concrete as the main building material because concrete has many advantages compared to other materials. Concrete has a high enough weight, various attempts were made to reduce the weight of the concrete for example using lightweight aggregates or concrete made without sand or concrete made hollow Innovations in the development of precast lightweight concrete are urgently needed at this time to support the development of development that is being carried out by the government. From the studies that have been carried out on lightweight concrete and fiber concrete, this research will develop the results of previous studies, namely by combining lightweight concrete and fiber concrete to obtain precast lightweight concrete. This research was conducted to find out how much influence the use of pumice and and fiber on compressive strength and flexural strength of precast lightweight concrete. Variations in the addition of a mixture of pumice with aggregate are divided into 4 comparisons, namely 0: 100, 20: 80, 40: 60, 60: 40, where each mixture is added 0.1% fiber from the volume of concrete, then printed in cube and beam molds. Compressive tests were carried out on the cube and flexural tests were carried out on beams. From the test results was obtained that the addition of pumice to the concrete mixture can cause a decrease in compressive strength of the concrete from 202 kg/cm2 to 129 kg/cm2 whereas with the addition of fiber there is an increase in flexural strength is 24.48 kg/cm2. The specific gravity obtained is 1.664 gr/cm3 so this concrete can be classified into lightweight concrete.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/201
10.26554/sti.2020.5.1.14-17
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January; 14-17
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/201/130
Copyright (c) 2020 Mrs Indrayani Indrayani
oai:ojs2.sciencetechindonesia.com:article/205
2020-05-02T10:37:55Z
jsti:ART
Selfish User Network Optimization With Celluler Network Traffic Management Model Using Lingo 13.0
Indrawati, Indrawati
Puspita, Fitri Maya
Silaen, Bela Olivia Mareta
Yuliza, Evi
Dwipurwani, Oki
5G mobile; QoS; traffic management; LTE
This paper discusses the management of traffic between cloud-based cellular networks. Welldesigned traffic management will allow network operators to draw maximum value from availablecapacity where cloud-based traffic management is called the UE (User Equipment). Runningtraffic management on the side of the UE allows decision making in the UE. Users can reach theQoS level to increase the speed of data received and communication latency or reduce theirpower consumption. Each UE maximizes their utility function, which is modelled based on theQoS parameters, selfishly, at the network side. So, the attempt is to maximize fairness among alluses’ flows by designing new improved model of traffic management cloud based of pricinginternet involving the energy consumption. Also in this paper parameters β as UE parameter valueand α as range value parameter are used. The results show that the improved model is betterthan the original one proposed by previous research in terms of maximum value reached althoughit takes more time for improved model to complete the iterations.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/205
10.26554/sti.2020.5.2.53-58
Science and Technology Indonesia; Vol. 5 No. 2 (2020): April; 53-58
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/205/135
Copyright (c) 2020 Fitri Maya Puspita, Indrawati Indrawati, Bela Olivia Mareta Silaen, Evi Yuliza, Oki Dwipurwani
oai:ojs2.sciencetechindonesia.com:article/206
2020-02-04T22:05:32Z
jsti:ART
Improved Multi Service-Reverse Charging Models for the Multi Link Internet wireless Using QOS Bit Error Rate QoS Attribute
Puspita, Fitri Maya
Yuliza, Evi
Herlina, Weny
Yunita, Yunita
Rohania, Rohania
n this article, a multi-link internet reverse charging scheme model on a multi-service network isproposed. The previous research seldom discussed the reverse charging scheme on multi linkand multi service network. This pricing scheme is designed with the aim of maximizing serviceprovider profits. Basic costs and the level of service satisfaction provided by the ISP is focusedon this attempt. This optimization problem can be solved using LINGO 13.0 software. Thisproblem was made and was divided into several cases. Thus, the results obtained can be aconsideration for ISPs in determining the price of services that can support an ISP. The improvedmodels that produce the maximum solution is case 3 (α and β as variables) and case 4 (α asvariables and β as parameters).
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/206
10.26554/sti.2020.5.1.6-13
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January; 6-13
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/206/129
Copyright (c) 2020 Fitri Maya Puspita
oai:ojs2.sciencetechindonesia.com:article/208
2020-02-04T22:05:32Z
jsti:ART
3-Phase Matheuristic Model in Two-Dimensional Cutting Stock Problem of Triangular Shape Items
Bangun, Putra Bahtera Jaya
Octarina, Sisca
Sepriliani, Sisca Puspita
Hanum, Laila
cahyono, Endro Sastro
Triangular, Modified Branch and Bound Algorithm, Matheuristic
Cutting Stock Problem (CSP) is a problem of cutting stocks with certain cutting rules. This study used the data of rectangular stocks, which cut into triangular shape items with various order sizes. The Modified Branch and Bound Algorithm (MBBA) was used to determine the optimum cutting pattern then formulated it into the 3-Phase Matheuristic model which consisted of constructive phase, improvement phase, and compaction phase. Based on the results, it showed that the MBBA produces three optimum cutting patterns, which was used six times, eight times, and four times respectively to fulfill the consumer demand. Then the cutting patterns were formulated into the 3-Phase Matheuristic model whereas the optimum solution was the minimum trim loss for the first, second and third patterns.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/208
10.26554/sti.2020.5.1.23-27
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January; 23-27
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/208/134
Copyright (c) 2020 Sisca Octarina
oai:ojs2.sciencetechindonesia.com:article/211
2020-02-04T22:05:32Z
jsti:ART
Acute Toxicity Test of Jatropha curcas L. on Nile Tilapia Seeds (Oreochromis niloticus L.)
Nurhidayanti, Nurhidayanti
ABSTRACT
The study investigating acute toxicity test of Jatropha curcas L. on Nile tilapia seeds (Oreochromis niloticus L.), had been conducted in May 2017, in Balai Riset Perikanan dan Perairan Umum (BRPPU) Mariana, Banyuasin. This study was aimed to determine the concentration of Jatropha curcas seed powder needed to cause 50% death of Nile tilapia seeds (LT50). This acute toxicity test used biological test with exposure time of 96 hours. The concentrations of Jatropha curcas tested were 0 (control), 240, 288, 346, 415, 498, 597, and 716 ppm which were applied for 96 hours. Data were analyzed using Spearman-Karber method with SPSS. Result showed LC50 of 24 hours was 551,271 ppm, LC50 of 48 hours was 466,513 ppm, and LC50 of 96 hours was 393,892 ppm. Meanwhile, LT50 for 597 ppm of Jatropha curcas was 1285, 166 minutes, and LT50 for 761 ppm was 784,121 minutes. The higher the concentration of Jatropha curcas seeds given the fastest time needed to cause the death of Nile tilapia seeds, Jatropha curcas seeds had moderate toxicity.
Keywords: Acute toxicity, Jatropha curcas L., Biological test, Oreochromis niloticus L
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/211
10.26554/sti.2020.5.1.18-22
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January; 18-22
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/211/131
Copyright (c) 2020 Nurhidayanti Nurhidayanti
oai:ojs2.sciencetechindonesia.com:article/221
2020-02-02T21:58:15Z
jsti:in
Author Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/221
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/221/132
Copyright (c) 2020 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/222
2020-02-02T21:58:15Z
jsti:in
Subject Index
Lesbani, Aldes
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-01-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/222
Science and Technology Indonesia; Vol. 5 No. 1 (2020): January
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/222/133
Copyright (c) 2020 Aldes Lesbani
oai:ojs2.sciencetechindonesia.com:article/223
2020-05-02T10:37:55Z
jsti:ART
A Hidden Markov Model for Forecasting Rainfall Data Availability at the Weather Station in West Sumatra
Ramadhan, Rahmawati
Devianto, Dodi
Hidden Markov Model
Rainfall
Decoding Problem
Indonesia is a maritime continent in Southeast Asian, laying between Indian Ocean and Pacific Ocean. This position intensely affects the level of rainfall in Indonesia, especially West Sumatra. The availability of rainfall data can form a Markov chain which its state is not able to be observed directly (hidden), is called the Hidden Markov Model (HMM). The purposes of this research are to predict the hidden state of the availability of rainfall data using decoding problems and to find the best state sequence (optimal) by using Viterbi Algorithm, and also to predict probability for the availability of rainfall data in the future by using the Baum Welch Algorithm in the Hidden Markov Model. This research uses secondary data with a period of one day from the availability of rainfall data at the Minangkabau Meteorological Station, Padang Pariaman Climatology Station, and Silaing Bawah Geophysics Station from January 2018 to July 2019. The results of the prediction show that the Hidden Markov Model can be used to predict the probability of rainfall data availability. The results for the availability of the highest rainfall data for one day ahead is at the Padang Pariaman Climatology Station, with a probability of 0.36, followed by Minangkabau Meteorological Station is 0.35, and Silaing Bawah Geophysics station is 0.29. The result has shown for the next one day period the probability of rainfall data available from the three stations will be available following the Viterbi algorithm.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/223
10.26554/sti.2020.5.2.34-40
Science and Technology Indonesia; Vol. 5 No. 2 (2020): April; 34-40
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/223/136
Copyright (c) 2020 Rahmawati Ramadhan, Dodi Devianto
oai:ojs2.sciencetechindonesia.com:article/225
2020-11-18T03:09:03Z
jsti:ART
Cement Compressive Strength Control Using CUSUM and MCUSUM Control Chart
Sari, Surya Puspita
Yanuar, Ferra
Devianto, Dodi
Cement compressive strength
Control chart
CUSUM
Compressive strength is one of the test factors used to determine whether cement production is in a controlled state or not. Portland type composite cement or PCC is the cement that is widely used in infrastructure development. The Cement of 3-days compressive strength, 7-days compressive strength, and 28-days compressive strength are the variables that will be controlled in this study. The normal distribution test and correlation test show that the data on each variable is normally distributed, and each variable has a strong correlation. Univariate cement control using the cumulative sum control chart (CUSUM) and multivariate control using a multivariate cumulative sum (MCUSUM) control chart is performed to obtain the best control results. Correlated variables show that control using a multivariate control chart results in fewer outs of control observations compared to a univariate control chart. This explains that the MCUSUM control chart is more sensitive than the CUSUM control chart in controlling observations of data out of control.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/225
10.26554/sti.2020.5.2.45-52
Science and Technology Indonesia; Vol. 5 No. 2 (2020): April; 45-52
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/225/137
Copyright (c) 2020 Dodi Devianto, Surya Puspita Sari
oai:ojs2.sciencetechindonesia.com:article/229
2020-07-24T04:00:22Z
jsti:ART
Simulation Study of Autocorrelated Error Using Bayesian Quantile Regression
Desviona, Nayla
Yanuar, Ferra
The purpose of this study is to compare the ability of the Classical Quantile Regression method and the Bayesian Quantile Regression method in estimating models that contain autocorrelated error problems using simulation studies. In the quantile regression approach, the data response is divided into several pieces or quantiles conditions on indicator variables. Then, The parameter model is estimated for each selected quantiles. The parameters are estimated using conditional quantile functions obtained by minimizing absolute asymmetric errors. In the Bayesian quantile regression method, the data error is assumed to be asymmetric Laplace distribution. The Bayesian approach for quantile regression uses the Markov Chain Monte Carlo Method with the Gibbs sample algorithm to produce a converging posterior mean. The best method for estimating parameter is the method that produces the smallest absolute value of bias and the smallest confidence interval. This study resulted that the Bayesian Quantile method produces smaller absolute bias values and confidence intervals than the quantile regression method. These results proved that the Bayesian Quantile Regression method tends to produce better estimate values than the Quantile Regression method in the case of autocorrelation errors.
Keywords: Quantile Regression Method, Bayesian Quantile Regression Method, Confidence Interval, Autocorrelation.
Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya
2020-07-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
http://sciencetechindonesia.com/index.php/jsti/article/view/229
10.26554/sti.2020.5.3.70-74
Science and Technology Indonesia; Vol. 5 No. 3 (2020): July; 70-74
2580-4391
2580-4405
eng
http://sciencetechindonesia.com/index.php/jsti/article/view/229/146
Copyright (c) 2020 Nayla Desviona