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INDONESIA
BERKALA SAINSTEK
Published by Universitas Jember
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Berkala SAINSTEK (BST) merupakan jurnal ilmiah yang memuat artikel hasil penelitian di bidang sains dan teknologi. Secara khusus BST diperuntukan bagi penulis internal mahasiswa Universitas Jember bidang fisika, matematika, biologi, kimia, teknik sipil, teknik mesin, teknik elektro dan sistem informasi. Namun BST juga menerima artikel dari penulis eksternal sepanjang memenuhi kriteria dan dalam lingkup bidang sains dan teknologi.
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Articles 7 Documents
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Search results for , issue "Vol 12 No 3 (2024)" : 7 Documents clear
Cox Proportional Hazard Model for Analysis of Farmers Insurance Premium Payment Period Rosida, Ayu; Fatekurohman, Mohamat; Dewi, Yuliani Setia; Arif, M. Ziaul
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.47118

Abstract

The sub-sector of agriculture plays a significant role in the national economic order. The crop failure rate is one of the unexpected risks caused by natural disasters, including drought, pest attacks, and floods. Agricultural insurance has been used as a pilot project in several areas, such as Gresik and Palembang Regencies. This pilot project has not been carried out in many places and cannot be implemented optimally in Jember. Farmer insurance is a transfer of risk due to farming business losses so that the sustainability of the farming business can be guaranteed. Survival analysis is a statistical method for analyzing data with observed response variables in terms of the time until an event occurs. One survival analysis is to determine the factors that cause an event with a response variable, namely using the Cox Proportional Hazard Model. The results of the significance testing obtained the variable that had a significant influence on the model, namely the growing season variable (X4). Then, a hazard ratio comparison was made for the category of cultivation season variables, and the category with the lowest hazard value was selected, followed by the second category, the months of May until August. (X42), This significantly influenced the policyholder’s time spent paying farmer’s insurance premiums.
Tempe Wastewater Treatment Using Effective Microorganism (EM) Based on Kepok Banana Peel Waste Putri, Dwi Yolanda; Nurhayati, Indah; Sutrisno, Joko; Kholif, Muhammad Al; Widyastuti, Sri
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.46979

Abstract

This study aims to evaluate the effectiveness of using Lactobacillus sp. bacteria as an Effective Microorganism (EM) solution derived from kepok banana peel waste to treat tempeh wastewater. The research was conducted using four reactors with varying EM concentrations (0%, 10%, 20%, and 30%) that were processed over 16 days. The results demonstrated a significant decrease in COD, BOD, and TSS levels. Reactor R4, containing 30% EM, reduced BOD by 78.01%, increased DO to 1.31 mg/L, and raised pH to 5.86. Reactor R3, with 20% EM, achieved the highest COD reduction of 78.13%. Additionally, Reactor R2, containing 10% EM, reduced TSS by 66.81%. This study indicates that EM derived from kepok banana peel waste can effectively degrade organic pollutants in tempeh wastewater, offering an environmentally friendly treatment method.
Implementation of the Fuzzy Time Series Singh Method for Forecasting Non-Oil and Gas Export Values in Indonesia Borahima, Maharani Safira B.; Sain, Hartayuni; Setiawan, Iman; Fadri, Firda
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.52663

Abstract

Export activities drive a country's economic growth by increasing revenue and strengthening trade relations between countries. In Indonesia, non-oil and gas products are the primary contributors of export performance. In 2022, non-oil and gas exports values reached 275.96 million USD, marking an increase of 25.80% compared to the previous year's export value. This growth in export value was influenced by various external factors, leading to substantial changes. The government requires further analysis to forecast future trends in non-oil and gas export values due to the uncertain and fluctuating patterns. The Singh Fuzzy Time Series method, an advancement of FST, utilizes fuzzy sets to forecast volatile economic data, yielding more accurate predictions. This research used the Singh FST method and achieved a low MAPE value of 1.31%, indicating a high level of accuracy. Forecasts for Indonesia's non-oil and gas export value over the next three months are projected to reach USD 22,263.02 million in January 2023, followed by USD 22,217.21 million in February 2023, and USD 22,243.68 million in March 2023. These export value forecasts can aid the government in policy-making related to exports and sustain the stability of the country’s economic growth rate.
Metic: Biodegradable Plastic from Melinjo Starch and Waste Cooking Oil (WCO) as an Alternative Food Packaging Rahmawati, Tiara; Gunawan, Fikri Iqlilah; Azkia, Syifa Raisatul; Kinasih, Ida
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.46829

Abstract

The use of plastic in food packaging and the high amount of plastic waste generated worldwide, including Indonesia, are serious threats to the environment. In addition, synthetic plastics in food packaging can also harm human health. Bioplastic products from natural ingredients and waste materials are developed as an alternative to reduce these risks. The purpose of this study was to determine the effect of the addition of starch concentration from melinjo seeds (Gnetum gnemon L.) with a combination of glycerol from waste cooking oil and chitosan substances from waste fish scales on the physical properties and biodegradability of bioplastics. To make bioplastic samples, the variation of melinjo seed starch concentration used in this study was 5, 10, and 15 grams with additional ingredients of 1 ml of glycerol and 1 gram of chitosan for each sample. Bioplastics were made at 32°C for 72 hours. Bioplastic properties were tested by conducting several tests such as swelling percentage, water and temperature resistance tests, tensile strength tests, elongation tests, and biodegradation tests. Based on this study, plastic with a composition of 5 grams of starch, 1 ml of glycerol, and 1 gram of chitosan produces the best physical characteristics of bioplastics and good reasonable biodegradation rates. Further research is recommended by increasing the concentration of starch, glycerol, and chitosan to produce better-quality bioplastics to be used as an alternative to commercial plastics.
The Implementation of Water Sensitive Urban Drainage to Overcome the Risk of Flooding in Malang City Yani, Dandy Achmad; Suwignyo, Suwignyo; Darmawan, Azhar Adi; Nissa, Khoirin
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.47437

Abstract

This study aims to apply Water Resources Urban Design (WSUD) technology to improve water quantity and quality in the Brantas River Watershed (DAS), especially in Oro-Oro Dowo Village, Malang City. This village was chosen because several drainage channels have decreased efficiency in accommodating water runoff during the rainy season. The application of WSUD technology is expected to reduce the high surface runoff due to the decrease in water absorption areas, so this can be an alternative to conserving the availability of water resources in terms of quantity and quality. The modeling scenarios are arranged into two types. In the first scenario, the model is made without the application of WSUD, while in the second scenario, WSUD technologies are applied. There are permeable pavement, bioretention, constructed wetlands, and green roofs. The methodology used for the application of the WSUD concept is through the SWMM (Storm Water Management Model) program. The application of WSUD technology in the case study in Oro-Oro Dowo Village is planned along the sidewalks on Jalan Rinjani, Jalan Jakarta/Jalan Simpang Ijen, Jalan Besar Ijen, and Jalan Panggung, as well as green open spaces/city forests located in the administrative area of the village. The results of this study are in the form of a comparison of the total surface water runoff before and after the implementation of WSUD for each technology. As a result, green roof technology has the potential to reduce surface runoff higher than other technologies. However, the obstacles in the application of green roofs are the cost and roof leaks. Thus, the application of a combination of permeable pavement, bioretention, and constructed wetlands can be another option. The results of the application of the WSUD combination reached 96.88%.
Methyl Red Based Test Strip for Identification of Formalin Compounds in Fish Samples Haji, Lina Sun; Anida, Choirun Nisa; Aprilianti, Caleysda; Fauziyyah, Himayah Izmi; Pitaloka, Diah Ayu; Zulfikar, Zulfikar
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.52156

Abstract

Methyl red based test strips were introduced a simple method for formalin identification. The test strip was designed based on the feasibility of the formalin oxidation reaction using hydrogen peroxide in an alkaline medium and using the methyl red indicator which is detected at a wavelength of 526 nm, with a concentration range from 1.0 - 10.0 ppm. The test strip was designed by immobilizing methyl red and NaOH in a Whatman paper matrix number 40 for 40 minutes and it has been evaluated by adding formalin samples and oxidator to the surface of the test strip. Optimum measurement conditions were obtained at 0.05 mL of 0.06M methyl red, 0.2 mL of 0.001M NaOH and 0.25 mL of 2% H2O2. The test strip has a good performance to identify formalin in the concentration range of 1.0 - 7.5 ppm which is monitored by a color change from yellow to red. The feasibility of using the test strip is also carried out by analyzing real samples through a recovery test. Test strips still can be used to identify formalin until 30 days when it stored at room temperature, and 2 days when it stored in the refrigerator.
Preliminary Study of Chitin Extraction from House Crickets (Acheta Domesticus) Through Green Process Using Deep Eutectic Solvent (DES) Chlorine Chloride - Urea Athirah, Febriana Azhar; Umam, Hilman Imadul; Nur Fadila, Salsabil Intan; Pambudi, Teguh; Perdani, Meka Saima
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.47769

Abstract

Insects serve as a sustainable alternative source of chitin compared to crustaceans, due to their advantages in availability, reproductive rates, and resilience to environmental conditions. Chitin is a natural biopolymer widely utilized in various industries, including food, pharmaceuticals, and biotechnology. This study represents a preliminary investigation aimed at evaluating the effects of varying solution ratios and stirring times on the yield of chitin and the degree of acetylation (DA) obtained from insect chitin extraction using a Green Process with Deep Eutectic Solvent (DES) composed of Choline Chloride (ChCl) and Urea in a molar ratio of 1:2 (w/w). The extraction process involved varying the solution-to-raw material ratios (1:10, 1:15, 1:20) and stirring times (2, 4, 6 hours). Analysis was performed using FTIR to measure DA, and yield calculations were based on the mass comparison before extraction. The results indicated that the DA values and mass yields were lower than those reported in the literature, likely due to residual impurities and the incomplete removal of DES from the samples. The highest DA value of 78.44% was achieved in the sample with a 1:10 ratio and a stirring time of 6 hours, while several other samples exhibited lower DA values due to ineffective deproteinization. This preliminary study provides an important foundation for further research, emphasizing improvements in extraction and purification methods to enhance the quality of the produce.

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