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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.
Arjuna Subject : -
Articles 254 Documents
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Factors Influencing the Intention of Jakarta Workers to Move to the State Capital in Kalimantan: From Systematic Literature Review to Conceptual Framework of Push-Pull-Mooring Iskandar, Yelita Anggiane
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i1.38101

Abstract

The plan to relocate the national capital (IKN) from DKI Jakarta to Kalimantan Island will soon be realized when the population relocation is initiated by workers, one of whom is from the central ministry sector. This has never been studied before regarding the need to change residence, so the factors that encourage or restrain workers from moving to IKN have not been identified. Ideally, the transfer of these workers to IKN is based on full willingness and awareness of the conditions of life that will be lived in the future. To find out how far the intention of Jakarta workers is to move to IKN, factor analysis is needed using the Structural Equation Modeling (SEM) method. The concept used to investigate these push, pull, and restraint factors is push-pull-mooring (PPM). These three factors are important to study to obtain a model structure that can be used as a direction for IKN development. In addition, this research is also intended to find out technical information related to the reasons behind the readiness of Jakarta workers to change their domicile to IKN so that the expectations of the benefits of the new capital city can be accommodated as well as possible by interested parties, such as the central government. and regions, including the private sector.
Decision Support System Design and Development for Determine Graduate Phase of College Students with Naïve Bayes Algorithm Web-Based in Indonesia Institute of Business and Technology Adyana, Andres; Dirgayusari, Ayu Manik; Maharani, Nia; Andika, I Gede; Supartha, I Kadek Dwi Gandika
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i1.33385

Abstract

In the course of the lecture period, each student is different, various factors can affect the mental and academic achievement of students which have an impact on their graduation period. This things also impact on the campus of the Indonesian Institute of Business and Technology, until now there is no system that can determine the graduation period of students at the campus, therefore it is necessary to build a decision support system to determine the graduation period of students, especially students in the Informatics Engineering Study Program and Program Study of Computer Systems at the Indonesian Institute of Business and Technology (INSTIKI) using the Naïve Bayes algorithm that utilizes parameters, namely student academic data consisting of work status, Semester Achievement Index (IPS) scores semesters one untill four, and Grade Point Average (IPK). The system designed by using the GaussianNB library in python and website based. From the results of this study, the accuracy of the model made on the system produces an accuracy value of 87.5% with a dataset rule of 800 data and the data is divided and used as test data by 20%, while the accuracy value of classifying 250 test data on the system is 80.8%.
The Making of Liquid Soap Based on Used Cooking Oil with An Addition of Starfruit Extract (Averrhoa Carambola L.) as an Antioxidant Agustine, Dine; Nurlatifah, Ismi; Choirunnisa, Shaquariza Faiz Indra
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i1.38096

Abstract

The used cooking oil is a waste that can damage environmental sustainability if its disposed of directly without processing. One of the utilization of it, is as a raw material for making the liquid soap. Sweet starfruit (Averrhoa Carambola L.) is known have a potential as a source of natural antioxidants due to its high vitamin C content, flavonoid content and phenolic compounds. This study aims to determine the effect of adding sweet starfruit extract with variation of concentrations 8%, 10% and 12% on used cooking oil-based liquid soap and to analyze the characteristics of the resulting soap. The results showed that the organoleptic tests (shape, odor, color, water content and foaming power) met the SNI standards 06-3352-2016 which were quite good. The addition of sweet starfruit extract with a concentration of 12% was the most effective as an antioxidant.
The Plan and Realization Evaluation of Supply Crude Oil Activities at PT Kilang Pertamina International - Refinery Unit VI Balongan Putri, Cheryl Suciyanti; Vikaliana, Resista
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i1.37998

Abstract

PT Kilang Pertamina International - Refinery Unit VI Balongan is the sixth refinery out of seven refineries owned by PT Pertamina (Persero) that processes crude oil into BBM (Fuel Oil), Non-BBM and Petrochemical products in maintaining energy sustainability in Indonesia. Oil and gas management activities carried out by PT Pertamina must be able to run according to the target. For this reason, in carrying out its business processes, PT Pertamina requires good planning for crude oil. This study focuses on the type of Super Heavy (SH) crude oil including Duri, Cinta, Escalante, Ostra, etc., and Heavy (H) including Banyu Urip, GG Condensate, Minas/SLC, Cabinda, Etame, etc. The purpose of this study is to evaluate the discrepancy between plans and the realization of crude oil orders as well as forecasting for the next 12 periods of crude oil at PT KPI - RU VI Balongan. The results show that several forecasting methods match the demand data pattern, namely the cyclical method, cyclical trend, and multiplicative decomposition (seasonal) methods. In finding the error value forecasting is done by calculating the Mean Absolute Percentage Error (MAPE) method. The selected forecasting method that has the highest accuracy is the cyclical trend forecasting method with a MAPE value of 0.22 for heavy crude oil and 0.13 for super heavy crude oil. The cyclical trend forecasting method has succeeded in reducing the error in the crude supply accuracy level compared to the existing Master Program (MP) crude method.
Cover BST Volume 11 No 1 (2023) BERKALA SAINSTEK, Jurnal
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Performance Assessment of Agrotourism Oriented Irrigation Systems in Subak Sembung, Denpasar City Agripina, I Gusti Ayu Widi; Siswoyo, Hari; Sumiyati, Sumiyati
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i2.36887

Abstract

Subak Sembung has a wide coverage area of 103 ha of rice fields with a total length of 5.1 km of tertiary irrigation canals. The Subak Sembung area has experienced land conversion of 14 ha which has had an impact on the performance of the subak system. The strategy that can be implemented to maintain the sustainability of the subak system is to develop agrotourism. Based on the survey results at the study area, there are several problems that have the potential to disrupt the performance of the irrigation system, including damage to irrigation structures and leakage of irrigation canals, and a lack of support for subak development towards agrotourism. The aim of this study was to assess the condition and performance of an agrotourism-oriented irrigation system in Subak Sembung. This research was conducted using field survey and interview methods. Field surveys were carried out with the aim of determining the conditions of agrotourism-oriented irrigation systems. Interviews were conducted to assess the performance of an agrotourism oriented irrigation system using the subak assessment form based on the Tri Hita Karana developed by the Udayana University Subak Unit and the agro-tourism form. Based on the research that has been done, it can be stated that the condition of the agrotourism oriented irrigation system in Subak Sembung is good. This is shown based on the functioning of irrigation network assets and non-irrigation networks. The performance of agrotourism oriented irrigation systems in Subak Sembung is in the range of 3.66 - 5.00 in the good category.
Effect of Air Humidity in MIG Welded Joints on Tensile Strength and Impact Strength of Aluminum 5052 Nduru, Fandi Bachtiar; Nugroho, Nur Yanu
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i2.37546

Abstract

In the shipbuilding process, delays often occur. In general, to speed up a ship's construction, overtime is carried out by workers until nighttime. Environmental conditions in a welding process, especially air humidity, strongly affect the properties of welded joints. The formation of hydrogen in the air caused by an inappropriate environment can cause defects in welded joints, especially porosity defects. Variations of welding environmental conditions used, are welding in the morning at 84% air humidity, daytime welding at 53% air humidity, and nighttime welding at 77% air humidity. This study aims to determine the material strength of air humidity variations during the welding process on the tensile strength and impact strength of 5052 aluminum material. This research uses experimental quantitative methods data analysis techniques used analysis of variance (ANOVA). The results showed that the higher the air humidity, the tensile and impact strength decreased. From the results of the tensile test, there is an influence of air humidity on the average value of tensile strength, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 110.614 MPa. From the impact test results, there is an influence of air humidity on the average value of impact toughness, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 89.42 J/mm2. From the ANOVA test results, the average tensile test and impact test have no significant differences.
Gleichenia linearis (Burm.) C. B. Clarke Leaves Extract Potent as a Medicinal Plant Based on Its Phytochemical Profile and The Total Phenolic Content Swandi, Monica Kharisma; Salmi, Salmi
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i2.34875

Abstract

Resam fern (Gleichenia linearis (Burm.) C.B. Clarke) is a terrestrial plant that is easy to grow and has been used for medicinal purposes as by the community empirically. This study aimed to explore the potential of Gleichenia linearis (Burm.) C.B. Clarke) as medicinal plants based on their phytochemical profiles and total phenol content of the extract. Gleichenia linearis (Burm.) C.B. Clarke leaves were extracted with aquadest and methanol as a solvent by maceration method. Phytochemical content was detected qualitatively and the total phenol content was determined using colorimetric method with Folin-Ciocalteu reagent. As the result, qualitative screening for secondary metabolic contents in Gleichenia linearis (Burm.) C.B. Clarke extract found that the aqueous extract contains alkaloids, phenols, flavonoids, tannins, triterpenoids and steroids, but the saponin and steroid were not detected. In the methanol extract, all secondary metabolites were detected except triterpenoids. The total phenol content of methanol extract was higher than that of aqueous extract with levels of 127,08 mg/g GAE and 42,32 mg/g GAE, respectively. Based on these findings, it can be concluded that the Gleichenia linearis (Burm.) C.B. Clarke leaf has the potential to be developed as a medicinal plant.
Cover BST Volume 11 No 2 (2023) BERKALA SAINSTEK, Jurnal
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

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Abstract

Anti-Termite Activities of The Bioactive Compounds of Gaharu Culture (Aetoxylon sympetalum) From Maceration Results Using Acetone Solvent Yuniar, Risa; Jayuska, Afghani; Alimuddin, Andi Hairil; Wibowo, Muhamad Agus; Ardiningsih, Puji
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i2.38015

Abstract

Agarwood is a plant known for its aromatic resin, which is one of the most widely distributed species in Indonesia. This research was carried out in several stages, namely maceration, partitioning, Thin Layer Chromatography (TLC), and termites activity. The test was carried out for 3 days with variations in the concentration of 0% (negative control), 0.1%, 0.2%. 0.3%, 0.4%, 0.5% (w/v), and 0.25% fipronil reagent as positive controls. The crude extract yield of sapwood gaharu aloe acetone obtained was 23,4321% and the partition result of 233,789 grams of crude extract of acetone consisted of n-hexane fraction with a yield of 3.812%, chloroform fraction of 42.205%, and acetone fraction of 43.621%. The results of the phytochemical test showed that aloe vera sapwood contained alkaloid compounds, flavonoids, steroids, terpenoids, phenolics and saponins. GC-MS analysis of the n-hexane fraction showed the number of peaks as many as 55 peaks which may contain 55 compounds in the fraction. The compound with the highest % area was 4-Chloro-6-methoxy-2-methyl quinoline-8-amine (10.33%) followed by stigmasterol compound (5.94%). The results of the termite activity test showed that the most active fraction as an anti-termite was acetone fraction (LC50 0.082%) followed by chloroform fraction (LC50 0.134%), crude extract (LC50 0.144%) and n-hexane fraction (LC50 0.176%)

Page 20 of 26 | Total Record : 254

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