cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
berkala.saintek@unej.ac.id
Editorial Address
-
Location
Kab. jember,
Jawa timur
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.
Arjuna Subject : -
Articles 269 Documents
 23   24   25   26   27 
Subsurface Structure Modeling Based on Gravity Anomaly in Kutai Kartanegara Regency Utama, Ahmad Muhadjir; Muhardi, Muhardi; Perdhana, Radhitya
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60007

Abstract

This study aims to model the subsurface structure in Kutai Kartanegara Regency based on Free Air Anomaly (FAA) gravity data from the TOPEX satellite. Bouguer and terrain corrections were applied to obtain the Complete Bouguer Anomaly. Regional and residual anomalies were separated using the upward continuation method. Modeling was performed on the regional anomalies to identify the subsurface structure at the study location. The modeling results show that there are six rock formations: the Kampung Baru Formation (Tpkb) has a density of 2.31-2.35 g/cm3, the Balikpapan Formation (Tmbp) has a density of 2.44-2.5 g/cm3, the Pulau Balang Formation (Tmpb) has a density of 2.538 g/cm3, the Bebuluh Formation (Tmb) has a density of 2.21 g/cm3, the Pamaluan Formation (Tomp) has a density of 2.36-2.39 g/cm3, and the Alluvial Deposit (Qa) has a density of 2.2 g/cm3. The 2D modeling also shows subsurface geological structures in the form of anticlines, synclines, and thrust faults.
Design of Special Moment Resisting Frame Structure (SRPMK) for 5 Floor Buildings Based on SNI 2847-2019 and SNI 1726-2019 in Padang City Yanto, Heri; Oni Guspari
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60008

Abstract

Padang City is located in one of the highest seismic hazard zones in Indonesia, situated near the Sunda Megathrust and the Sumatran Fault System. Constructing earthquake-resistant buildings in this region is not only a technical necessity but also a life-safety imperative. This research outlines the design of a five-storey office building utilizing the Special Moment Resisting Frame (SMRF) system in accordance with SNI 2847-2019 and SNI 1726-2019 standards. Seismic forces were modeled with the response spectrum approach, and a 3D Structural Analysis Software was utilized for structural evaluation. The site's soil classification resulted in a medium soil (SD) category, with SDS = 1.024 g and SD1 = 0.702 g, and the seismic response modification coefficient (R) = 8. The structural dimensions were established as follows: slab thickness of 130 mm, column size of 650 mm × 650 mm, primary beam size of 400 mm × 650 mm, secondary beam size of 250 mm × 450 mm, and tie beam size of 400 mm × 600 mm. Every reinforcement derived from each structural component meets the standards of SNI 2847-2019, the Standard of Structural Concrete for Buildings.
Proximate Analysis of Fish Feed Made from Organic Waste Enriched with Lactobacillus casei and Saccharomyces cerevisiae Sukmawati; Ponisri; Bhertha Mangallo; Ishak Musaad; Nurul Kusuma Dewi; Riman Sangadji
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60009

Abstract

The utilization of organic waste as a raw material for fish feed through fermentation represents an innovative and sustainable approach with the potential to enhance nutritional value while improving cost efficiency in aquaculture production. This study aimed to analyze the proximate composition of fish feed derived from fermented organic waste using Lactobacillus casei and Saccharomyces cerevisiae as probiotic agents. The raw materials included vegetable waste, fruit waste, and fish meal, formulated into two feed variations differing in bran proportion, namely 30% in Feed A and 50% in Feed B. An experimental research design was applied, and proximate analysis was conducted to determine moisture content, crude protein, crude fat, crude fiber, Nitrogen-Free Extract (NFE), and ash content. The results revealed that Feed A contained 4.73% moisture, 5.46% protein, 3.31% fat, 35.69% crude fiber, 33.62% NFE, and 21.92% ash. Meanwhile, Feed B showed 6.39% moisture, 5.83% protein, 1.76% fat, 37.91% crude fiber, 30.95% NFE, and 23.55% ash. These findings indicate that Feed A has a more balanced nutritional composition, characterized by higher fat content and lower crude fiber, suggesting better digestibility and potential feed utilization efficiency. In contrast, Feed B exhibited higher fiber and ash content, which may negatively influence nutrient absorption and feed performance. Overall, the fermentation of organic waste using probiotics demonstrates strong potential to improve the quality of alternative fish feed that is not only cost-effective but also environmentally friendly, supporting sustainable aquaculture practices.
Assessment of Drinking Water Quality Using the Drinking Water Quality Index (DWQI) Method for Bore Wells in Wringinpitu, Banyuwangi Regency Pranantya, Vanadani; Saifurridzal; Muhammad Trifiananto; Hilma Wasilah Robbani; Adelia Nur Isna Kartikasari
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60011

Abstract

The growing demand for drinking water driven by population increase requires not only sufficient supply but also assurance of water quality for safe consumption. In Wringinpitu Village, Banyuwangi Regency, groundwater from bore wells serves as a primary drinking water source due to limited piped water coverage. This study evaluates the feasibility of bore well water using the Drinking Water Quality Index (DWQI), integrating physical, chemical, and biological parameters into a single representative value. Water samples were collected from two bore wells and analyzed based on the Indonesian drinking water standard (Ministry of Health Regulation No. 2 of 2023). The results indicate that most parameters, including odor, color, turbidity, iron (Fe), pH, nitrate, nitrite, and microbiological indicators, comply with the established standards. However, Total Dissolved Solids (TDS) and Manganese (Mn) require particular attention. TDS concentrations reached 585 mg/L (SB-01) and 1091 mg/L (SB-02), exceeding the allowable limit of 300 mg/L, while Mn levels were 0.1 mg/L and 0.135 mg/L, respectively. Elevated TDS levels are likely influenced by the hydrogeological setting, particularly the proximity to coastal areas, which contributes to higher mineral content in groundwater. Meanwhile, Mn presence is associated with aquifer geochemistry and natural dissolution processes. The DWQI values of 51.40 (SB-01) and 69.45 (SB-02) classify both water sources as “good,” indicating that the water is generally suitable for consumption with minor treatment. From an environmental engineering perspective, these findings highlight the importance of simple treatment technologies, such as filtration or aeration, to reduce TDS and Mn concentrations. Ensuring sustainable access to safe drinking water therefore requires not only resource availability but also continuous quality control and appropriate treatment strategies.
Exploring the Potential of Indigenous Phosphate-Dissolving Fungi from Dengen Plants in the Buttu Forest of West Sulawesi Alang, Hasria; Fitri, Fitri; Hastuti, Hastuti
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60012

Abstract

A study has been conducted on the Exploration and Identification of Indigenous Phosphate-Solubilizing Fungi from Dengen plants in the Buttu Forest area of West Sulawesi. The purpose of this study was to determine the ability of phosphate-solubilizing fungi (JPF) to dissolve phosphate from rhizosphere fungi of dengen plants in the Buttu Puang protected forest area. The research method began with taking soil samples from around the roots of dengen plants in the Buttu Puang protected forest area. Next, the isolation of JPF)was carried out using a specific medium, namely pikovskayamedium, and continued with JPF potential tests qualitatively and quantitatively. The obtained isolates were then identified macroscopically and microscopically. The research data were visualized in the form of tables and figures, and explained descriptively. The results of the study showed that from three sampling locations (DG 1, DG 2 and DG 2), 13 fungi isolates were obtained that could grow on pikovskayamedium. The qualitative test results showed that the highest activity was seen in isolate DG 1.2, while the quantitative test results showed that the highest activity was seen in isolate DG 3.4. This indicates that the ability of fungi to solubilize phosphate can be determined through qualitative or quantitative activity only or both of them.
Unveiling the Antioxidant Power of Bidara (Ziziphus mauritiana): A Solvent-Based Analysis of Phenolics and Radical Scavenging Activity Saputra, Angga; Susilo
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60013

Abstract

The peel of Bidara (Ziziphus mauritiana) contains various bioactive compounds, particularly phenolic compounds with potential as natural antioxidants. This study evaluated the total phenolic content (TPC) and antioxidant activity of fruit peel extracts using four different solvents (methanol, ethanol, ethyl acetate, and n-hexane) through three antioxidant assays: DPPH, ABTS, and FRAP. The results showed that solvent type significantly affected TPC (p = 0.024) and all antioxidant parameters (p < 0.05). Methanol yielded the highest TPC (47.38 ± 11.81 mg GAE/g) and exhibited the strongest antioxidant activity in the DPPH and ABTS assays, while ethanol demonstrated the highest FRAP value (247.83 ± 41.27 μmol TE/g) despite having the lowest TPC. Correlation analysis revealed a positive and significant relationship between TPC and all antioxidant assays, especially between TPC and FRAP. These findings confirm that polar solvents such as methanol and ethanol are more effective in extracting phenolic and antioxidant compounds from Z. maurtiana peel, supporting their potential use in the development of functional food and pharmaceutical products.
Methanolic Peel Extract of Ziziphus mauritiana as a Promising Natural Antioxidant and Antibacterial Source Oktaviani, Violitta; Susilo
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60014

Abstract

Rising microbial resistance to synthetic antibiotics has prompted the search for natural therapeutic agents from underutilized agricultural waste. The growing resistance of microorganisms to synthetic antibiotics has prompted the search for new therapeutic agents derived from natural sources. The fruit peel of Ziziphus mauritiana remains underexplored, yet holds potential as a source of bioactive compounds. This study aimed to evaluate the antioxidant and antibacterial activities of the methanolic peel extract of Z. mauritiana and to analyze its correlation with total phenolic content (TPC). Extraction was performed using the Ultrasonic-Assisted Extraction (UAE) method, followed by analysis of antioxidant capacity (DPPH and ABTS assays) and antibacterial activity against Shigella dysenteriae and Staphylococcus epidermidis. The extract exhibited a high TPC value (49.80 ± 2.41 mg GAE/g DW) and significant antioxidant activity in both the DPPH (TEAC: 1117.41 ± 7.28 μmol TE/g) and ABTS (AEAC: 918.33 ± 3.14 μmol AE/g) assays. Pearson correlation revealed a perfect and statistically significant relationship between TPC and ABTS (r = 1.000, p < 0.01), and a strong but non-significant correlation with DPPH (r = 0.900, p = 0.288). Antibacterial activity showed moderate to strong inhibition zones at 80 mg/mL, with diameters of 13.60 ± 1.46 mm for S. dysenteriae and 14.41 ± 1.35 mm for S. epidermidis. These findings support the potential of Z. mauritiana peel as a natural source of antioxidants and antibacterial agents and highlight its relevance to the development of therapeutic formulations based on local biodiversity.
Chemical and Sensory Quality of Rebond Shrimp Paste Produced by the Arar Village PKK Group Sulfiana, Sulfiana; Galih Sandjaya; Fatimah Hardianti A.; Selpiana Gutandjala
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60015

Abstract

Shrimp paste is a traditional fermented product made from rebon shrimp that serves as important food flavoring agen and protein source, with chemical and sensory characteristics influenced by the raw materials and the fermentation process. However, studies integrating comprehensive proximate analysis and organoleptic evaluation on shrimp paste produced by community groups are still limited. This study aims to analyze the proximate composition and organoleptic quality of rebon shrimp paste produced by the PKK Group in Arar Village. The study was conducted using a descriptive quantitative method with a cross-sectional design. Proximate analysis included water, protein, fat, crude fiber, ash, and carbohydrate content using the AOAC method, while organoleptic testing was conducted using a nine-level hedonic scale for color, aroma, texture, and taste attributes by semi-trained panelists. The results showed that rebon shrimp paste had a water content of 33.93 ± 0.13%, protein 44.91 ± 0.18%, fat 1.72 ± 0.04%, crude fiber 2.66 ± 0.05%, carbohydrate 1.40 ± 0.05%, and ash 15.38 ± 0.07%. Protein was the dominant component, indicating a high potential nutritional value. Sensory tests showed a very good level of acceptance with a color score of 8.00, aroma 9.00, texture 8.00, and taste 9.00. In general, rebon shrimp paste produced by the PKK Group of Arar Village has exhibited good chemical quality and soensory acceptibility, and has potential for development as a local fermented food product with nutritional and economic value.
Process Optimization for Bioplastic Synthesis from Ulva Lactuca with the Addition of Citric Acid and Boric Acid as Crosslinkers Yukti Nurani; Hilda Huril Ainia; Alfun Ni’matil Husna; Sonya Hakim Raharjo; Merymistika Yufrani Afred; Ansori Ansori; Ratri Sekaringgalih; Helda Wika Amini; Ditta Kharisma Yolanda Putri; Meta Fitri Rizkiana; Boy Arief Fachri; Zuhriah Mumtazah; Istiqomah Rahmawati; Bekti Palupi; Felix Arie Setiawan
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60021

Abstract

The development of renewable biomass-based bioplastics is one solution to reduce environmental pollution caused by the use of conventional petroleum-based plastics. One potential source of biomass is Ulva lactuca, which contains ulvan polysaccharides that can be used as a material for forming biodegradable bioplastic films. This study aims to determine the optimum conditions for the synthesis of ulvan-based bioplastics using the Response Surface Methodology (RSM). Bioplastics were synthesized using the solution casting method with ulvan filtrate as the main matrix and polyvinyl alcohol (PVA) as the supporting polymer, with glycerol and sorbitol as plasticizers and citric acid and boric acid as cross-linkers. Optimization was performed using a Box–Behnken design with 17 experiments, with independent variables of boric acid mass (0.025 - 0.075 g), mixing temperature (65 - 75 ˚C), and mixing time (15 - 25 minutes). The optimization results showed that optimal conditions at a mixing temperature of 70 °C, boric acid mass of 0.05 g, and mixing time of 20 minutes, with point prediction of 4.1476 MPa in tensile strength, thickness of 0.088 mm, and desirability value of 1. The statistical model for tensile strength demonstrated an R2 value of 0.9468, an adjusted-R2 of 0.8785, and a lack-of-fit value of 0.3024. Meanwhile, the thickness model exhibited an R2 value of 0.9792, an adjusted-R2 of 0.9524, and a lack-of-fit value of 0.7510.

Page 27 of 27 | Total Record : 269

 23   24   25   26   27 

Filter by Year

2013 2026


Reset
Filter By Issues
All Issue Vol. 14 No. 2 (2026) Vol. 14 No. 1 (2026) Vol. 13 No. 4 (2025) Vol. 13 No. 1 (2025) Vol. 12 No. 4 (2024) Vol 12 No 3 (2024) Vol 12 No 2 (2024) Vol 12 No 1 (2024) Vol 11 No 4 (2023) Vol 11 No 3 (2023) Vol 11 No 2 (2023) Vol 11 No 1 (2023) Vol 10 No 4 (2022) Vol 10 No 3 (2022) Vol 10 No 2 (2022) Vol 10 No 1 (2022) Vol 9 No 4 (2021) Vol 9 No 3 (2021) Vol 9 No 2 (2021) Vol 9 No 1 (2021) Vol 8 No 4 (2020) Vol 8 No 3 (2020) Vol 8 No 2 (2020) Vol 8 No 1 (2020) Vol 7 No 2 (2019) Vol 7 No 1 (2019) Vol 7 No 1 (2019) Vol 6 No 2 (2018) Vol 6 No 1 (2018) Vol 5 No 2 (2017) Vol 5 No 1 (2017) Vol 4 No 1 (2016) Vol 3 No 1 (2015) Vol 2 No 1 (2014) Vol 2, No 1 (2014) Vol 1, No 1 (2013) Vol 1 No 1 (2013) More Issue