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Science and Technology Indonesia

JSTI
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Published by Universitas Sriwijaya

ISSN : 25804405 EISSN : 25804391 DOI : -

Core Subject : Science, Social, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics

An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016

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Articles 4 Documents

Search results for , issue "Vol. 4 No. 4 (2019): October" : 4 Documents clear

Kinetic Adsorption of Direct Yellow Onto Zn/Al and Zn/Fe Layered Double Hydroxides Neza Rahayu Palapa; Bakri Rio Rahayu; Tarmizi Taher; Aldes Lesbani; Risfidian Mohadi
Science and Technology Indonesia Vol. 4 No. 4 (2019): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

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.

The Branch and Cut Method for Solving Capacitated Vehicle Routing Problem (CVRP) Model of LPG Gas Distribution Routes: - Evi Yuliza; F.M Puspita
Science and Technology Indonesia Vol. 4 No. 4 (2019): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

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.

Determination The Coefficient of Restitution in Object as Temperature Function in Partially Elastic Collision Using Phyphox Application on Smartphone hamzarudin hikmatiar; Ishafit Ishafit; Mentari Eka Wahyuni
Science and Technology Indonesia Vol. 4 No. 4 (2019): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

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

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 wilis setyati; Subagiyo Subagiyo; Rini Pramesti; Delianis Pringgenies
Science and Technology Indonesia Vol. 4 No. 4 (2019): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

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.

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Kab. ogan ilir,

Sumatera selatan

INDONESIA