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Sainteks: Jurnal Sain dan Teknik
Published by Universitas Insan Cendekia Mandiri
ISSN : -     EISSN : 26858304     DOI : https://doi.org/10.37577/sainteks.v5i2
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering
Sainteks is a scientific journal that publishes research papers encompassing all aspects of natural sciences, technology and engineering. This journal is published 2 (two) times a year (March and September) by the Faculty of Engineering UICM d/h UNBAR. The fields covered by the Sainteks Journal include: - Chemical Engineering - Textile Chemical Technology - Industrial Engineering - Science - Textile Industry Technology - Environment
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 161 Documents
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Factors Affecting of Use of LMS in Indonesia Prakarsa, Graha; Sudirman, Iman; Affandi, Azhar; Santoso, Ferry
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.648

Abstract

The rapid growth of e-marketplaces in Indonesia today, has led to many users adopting the system, due to the large number of e-marketplace mobile applications, making it necessary for developers to know and pay attention to several factors that influence users in adopting e-marketplace application systems at this time, one of which is the only cost factor is perceived by the user. Data were collected as many as 100 respondents who had some experience in using e-marketplaces on a mobile basis, then analyzed using partial least squares-structural equation modeling (PLS-SEM). This research is based on the conceptual framework of the Unified Theory of Acceptance and Use Technology (UTAUT). The constructs used in this study are performance expectancy, effort expectancy, social influence, and facilitating conditions, but also add a perceived cost variable. The results show that performance expectancy, effort expectancy, and perceived cost have a positive and significant effect on the actual use of mobile e-marketplace users in Indonesia, but social influence and facilitating conditions do not significantly affect the actual use of mobile e-marketplace applications in Indonesia.
Downstream Analysis of Strategic Investment in Natural Gas Commodities in Increasing the Value of Indonesian Natural Gas Products Bhagya, Tombak Gapura; Wibowo, Jati Arie; Latipah, Siti; Prakarsa, Graha
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.649

Abstract

Indonesia as one of the natural gas producing countries needs to carry out product downstreaming. This is done to increase the added value of natural gas products. Natural gas exports must be reduced and converted into exports in the form of derivative products. Methanol, ammonia, urea, ammonium nitrate and soda ash are derivative products from natural gas that need to be developed. These product derivatives are used as a mixture of raw materials in various industrial sectors that are closely related to daily needs, so that the market and prices will not decrease.
The Potential of Cynodon Dactylon and Lolium Perenne 'Brightstar' as Phytoremediator Agents in Dealing with the Problem of Sea Water Intrusion in the North Coastal Area of Karawang Rizkiah, Riza; Sewiko, Roni; Pranoto, Aris Kabul; Pasaribu, Roberto Patar; Djari, Anthon Anthonny; Rahman, Abdul; Ismail, R Moh; Handayani, Endy; Luciana, Luciana; Mulyana, Muhammad Agus
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.651

Abstract

Sea water intrusion is a process where sea water is mixed with underground water around the coast, causing the ground water to become salty because it is contaminated by sea water which is rich in salt. Sea air that enters the ground causes the air to become unfit for consumption and causes the land to become unproductive for planting. People in the Pakis Jaya area, Karawang face difficulties, especially regarding land use for agricultural activities. This is because the land used for cultivating plants is saline soil with a high salt content. Phytoremediation is a method used to clean air or soil contaminated with pollutants, by using the ability of plants to absorb these substances. Cynodon Dactylon and lolium Perenne Brightstar plants are a type of grass that can be used to reduce high salt levels in the soil because these plants are able to live in places with high salinity and also have the ability to reduce salinity by absorbing chloride ions in it. The methods used in this research consisted of: Sampling Process, Plant Acclimatization Stage, Salinity Concentration Test before and after planting grass in Soil Media. The test results showed that the salt content in the soil before planting was 19.20 dS/m and after planting it was 0.02-0.03 dS/M.
Extraction of Polyphenols in Green Tea Shoots as Antioxidant Substance Siskayanti, Rini; Rizkiah, Riza; Muliati, Lia; Nurilah, Andini; Subagja, Deden; Fadil, MI
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.652

Abstract

Green tea is a plant that has polyphenolic active compounds. Polyphenols are a group of compounds that act as natural antioxidants. Antioxidants are needed by the body to protect the body from free radical attacks. The polyphenol content in the tea leaves itself is influenced by the weather, variety, soil type, and the degree of maturity of the leaves when picked. Therefore, in this study green tea shoots were used because the polyphenol content and antioxidant activity of green tea in the shoots are known to be greater than the leaves on the stalks below. This study aims to determine the levels of polyphenols in green tea shoots using distilled water, 50% ethanol; 96% ethanol and determine the value of antioxidant activity obtained from the results of samples that have the highest levels of total polyphenols by maceration method for 24 hours. The results of maceration are then separated between the filtrate and the precipitate. Then the filtrate is concentrated to obtain a thick extract and removes the remaining solvent using a rotary evaporator that is set to a pressure of 1 bar and a temperature below the boiling point of the solvent. Furthermore, the viscous extract obtained was tested by the Follin-Ciocalteu method using UV-Vis spectrophotometry at a wavelength of 765 nm and gallic acid as a standard to determine the levels of polyphenolic compounds. The test results for the highest levels of polyphenols were tested for antioxidant activity using the DPPH method (2,2 Diphenyl -1-Pikrylhidrazyl) which causes a color change and then measured using a spectrophotometer at a wavelength of 512 nm. Antioxidant activity can be seen from the IC50 (inhibitory concentration) value or the concentration that can reduce 50% of free radicals because the lower the IC50 value, the greater the antioxidant activity. The results showed that the levels of polyphenols in green tea shoot extract were respectively 16.47%; 22.16%; 18.09% so that the highest levels of polyphenols were obtained in green tea leaf extract macerated using 50% ethanol solvent. The results of the antioxidant activity test on samples using 50% ethanol solvent obtained an IC50 value of 5.7 ppm and included in the very good category.
Random Savings Algorithm for Solving Russian TSP Instances Sanggala, Ekra; Bisma, Muhammad Ardhya
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.654

Abstract

Travelling Salesman Problem (TSP) is the problem for finding the shortest route starting from start node then visiting number of node exactly once and finally go back to start node. Savings Algorithm (SA) is a heuristic for solving TSP. In the Savings Algorithm, the first step that must be taken is to calculate the Savings for each pair of nodes. Then the Savings values that have been obtained are sorted from the largest Savings to the smallest Savings. Route is made by first inserting into the route the pair of nodes who has the highest Savings value. Sometimes there are many pairs of node who have the same Savings value, so it will become problem for SA to choose one of them. Random Algorithm can be a solution for solving this problem. Using Random on SA, makes SA become Random Savings Algorithm (RSA). Performance RSA on solving TSP must be tested on TSP Instance. Two important criterias on the test are solution route and CPU Time. Russian TSP Instances contain ten TSP Instances, on which RSA can be tested. The test result shows that RSA can improve the length of existing route rapidly.
THE The Effect Of Ring Frame Thread Number And Winding Machine Counter On The Weight Of 69G Lot Cones On Winding Machine Number 8 Pravitasari, Filly; Kusumadewi, Afriani; Nurherawaty, Feny; Sulistio, Rino
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.655

Abstract

Abstract: A good and appropriate product quality control system can maintain product quality in accordance with the standards set by the company. Fabrics produced at PT X still has problems, namely the existence of product defects that exceed the maximum tolerance limit for defective products that have been set by the company, which is 2%. Types of fabric defects that often occur include color not ok (WTO), spot defects, crease marks and dirty color, so it is necessary to do an analysis for product quality control in each process using statistical quality control methods. ). Statistical quality control can detect the existence of special causes in variations or process errors through analysis of data from the past and the future by finding the cause of damage or product defects through existing data. Based on the results of the p control chart (p-chart) it was found that the quality of 100% viscose rayon fabric was outside the control limit, it was shown that there were still points that were outside the control limit and these points fluctuated very high and irregularly. This is an indication that the process is in an uncontrolled state or is still experiencing deviations. Furthermore, the results of the causal diagram analysis can identify the factors that cause defects in the production process, which are derived from factors of workers, production machines, work methods, and dyestuff/material. The data from the statistical quality control results can be quickly corrected so that the same mistakes do not happen again. Keywords : Quality Control, Fabric Defects, fishbone diagram
Evaluation of the lighting system in the science laboratory at school X in South Tangerang based on SNI 6197: 2020 Amarulloh, Reza Ruhbani; Nurhuda, Tiara
Sainteks: Jurnal Sain dan Teknik Vol 6 No 1 (2024): Maret
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i1.657

Abstract

This study aims to determine the feasibility of a laboratory lighting system in a school in South Tangerang based on SNI 6197: 2020. The methods used include direct observation and measurement of the actual condition of the laboratory and lighting simulations for various time conditions and room occupancy. The results showed that the actual condition of laboratory lighting has not met the minimum standards set, so it is necessary to redesign the lighting system, especially in increasing the utilization of natural lighting. With an actual WWR of 2.5%, daylighting is inadequate to achieve the desired illuminance level, making a redesign of the lighting system essential. Increasing the WWR to 10% resulted in an average illuminance that met and exceeded the minimum standards during operational hours, with average illuminance values in work areas consistently higher than 500 lx. This was done with the hope of optimizing laboratory functions and creating a conducive learning environment.
Batch Scheduling Model For a Flow Shop Two Stage to Minimize Total Actual Flow Time Sudarman, Nisa Noviani
Sainteks: Jurnal Sain dan Teknik Vol 6 No 2 (2024): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i02.646

Abstract

This research concerns a batch scheduling problem with the process time used in the existing batch scheduling research can vary. One of the factors influencing processing time is machine deterioration and learning-forgetting process. The effect of the deterioration can results in a longer process time due to decreased machine capability, as well as an increase in service life or usage. The effect of the learning process can result in a faster product processing time due to an increase in operator experience in processing the product. Meanwhile, the effect of the forgetting process can result in slower product processing times due to the lag time between processing of the same product. This research proposes a batch scheduling model for a flow shop with a processing tow-item with considering of the deterioration process in Stage One and learning-forgetting process in Stage Two. The objectives is to minimize total actual flow time. The decision variables in this research are number of batch (?), batch size (Qi), and batch processing sequence. The problem-solving method was developed by proposed heuristic algorithms.The proposed algorithm is consist of batching sub algorithm, and sequence sub algorithm. Numerical testing shows that the proposed algorithm is able to solve the problem of a batch scheduling for a flow shop to minimize total actual flow time and the solution obtained by the algorithm is a feasible solution.
Proposed Package Distribution Routes at PT. Pos Indonesia Mail Processing Center Bandung Martikasari, Arida Murti; Yulianto, Irwan
Sainteks: Jurnal Sain dan Teknik Vol 6 No 2 (2024): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i02.656

Abstract

Pos Indonesia is a delivery service provider company that has a central distribution center in theregion of West Java, which is the Mail Processing Center Bandung. MPC Bandung has a function to regulatethe distribution of packages according to the destination area. The company has a target to minimizetransportation costs when shipping goods. The delivery process carried out by MPC Bandung can bemodeled as the Vehicle Routing Problem (VRP). This research focuses on the efficiency of the distributionroutes of documents and packages to 12 destination post offices in the secondary West Java Region. Analysiswas conducted using two classical heuristic methods, Clarke and Wright Savings and Nearest Neighbor, withthe aim of obtaining a more optimal route in order to minimize transportation costs. Alternative 2, which isdesigned using the CAWSA method, was chosen to be the best alternative because it produces the shortestmileage output of 894.2 km per day with a savings of 54.11% on the existing route, which has a total mileageof 1,948.7 km. This alternative was chosen as a proposed route improvement for the company. Thetransportation cost efficiency was obtained at 50.94% from Rp. 115.546.200 for the existing route to Rp.56,686,500 for the selected route.
Evaluation of Lighting and Power Systems At State Vocational School 1 Kramatwatu Kautsar, Alif; Irwanto, Irwanto; Fatkhurrokhman, Mohammad
Sainteks: Jurnal Sain dan Teknik Vol 6 No 2 (2024): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v6i02.676

Abstract

Evaluation of the electrical installation of a building is something that needs to be done so that the quality of the electrical installation remains in good condition and reliability. This research aims to evaluate the lighting system. Energy needs are currently playing an increasingly important role in human life, one of which is the problem that arises in the use of energy consumption in the New Classroom Building (RKB) at SMK Negeri 1 Kramatwatu. This research aims to determine the value of energy requirements in the RKB building (IKE, kWh , kVA and Cost Tariff), the RKB building is a building that has 2 floors with a total of 12 classrooms, this building was established at the end of 2023, the RKB building has never had an Energy Audit which is useful for identifying inefficient energy use, this energy audit can reduce energy use in order to increase the level of efficiency. To find out the results with data that has been collected using manual calculations and lighting simulations using DIALux software version 12.1. This RKB building uses energy of 17,154kWh/day, 85,770kWh/week, 343,080kWh/month and 4,322,960kWh/year. 226,925VA/Day, 1,134,625VA/Week, 4,538.5VA/Month and 54,462VA/Year. and customer rates Rp. 19,061;/Day, Rp. 95,308;/week, Rp. 381,234;/Month and Rp. 4,574,808;/Year on consumption of lighting power loads and other power loads.

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