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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.
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Articles 8 Documents
 1 
Search results for , issue "Vol 12 No 2 (2024)" : 8 Documents clear
Ocean Contribution to Coastal Heavy Rainfall During Dry Season (Case Study of Bengkulu 2016-2022) Firdaus, Muhamad Dadan; Syamsuddin, Mega Laksmini; Yulihastin, Erma
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.43989

Abstract

This study aims to determine the contribution of the ocean to the intensity of heavy rainfall in Bengkulu, Indonesia during the dry season (2016-2022). The primary data used in this study is daily rainfall data from the Bengkulu Meteorology Climatology and Geophysics Agency BMKG station. In addition, supporting data are also used in the form of rain parameters, 10 m wind, sea surface temperature, and sea surface currents from ERA5 reanalysis data with daily temporal and spatial resolution of 0.05°. The method used is a composite method that calculates 64 samples of heavy rain. The results showed that low-speed winds formed an eddy in the sea area west of Sumatra which together with heavy rains resulted in an increase in sea surface temperature. In addition, for the 2019 dry season case study, 1 m/s winds near the Bengkulu coast are associated with heavy rainfall (>100 mm) and during the 2022 dry season, 1-4 m/s winds spread from the coast to the Indian Ocean sea, causing rainfall (>50 mm) on the Bengkulu coast and surrounding areas. When sea surface temperatures are high there is the potential for heavy rainfall in areas of low wind speed. The current in each year is different and has a pattern, every year a strong current from the Indian Ocean will move towards the coastal area every 3-year period. When in 2016 the current (>1 m/sec) is in the Indian Ocean, then the following year 2017 the current (>1 m/sec) shifts closer to the coastal area until in 2018 a strong current is on the coast and the following years a stronger current comes from the Indian Ocean.
Invitro Activity of Mineral Trioxide Aggregate Modification from Rice Hull Ash Silica and Calcium Oxide from Clamshells Yuliatun, Leny
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.45789

Abstract

The impact of SrO particles and hydroxyapatite (HA) on the characteristics of Mineral Trioxide Aggregate (MTA) from silica Rice Husk Ash (RHA) and Precipitated Calcium Carbonate (PCC) from clam shell has been studied in this research. Silica and calcium oxide are used as material to form tricalcium silicate (C3S) and dicalcium silicate (C2S) in MTA. Bi2O3 and SrO were added in MTA with 18% (w/w) total percentage. MTA was made with a sol-gel process and used catalyst NH3. After synthesis, material was calcined at 1000 oC for 3 h. HA was added at percentages of 3, 6, and 9% in 5% SrO modified MTA to see the effect of its addition on the material. The modified MTA (MTA-SrO-HA) were hydrated water using water to powder method with ratio of 3:1. The MTA-SrO5/HA6 showed higher compressive strength and dentine interaction to the commercial MTA (Proroot brand) in days 3 and 7. This material had potential as a root canal filling in dental endodontic treatment.
Polyphenol Extraction from Musa corniculata Peel Using Microwave Assisted Extraction (MAE) Method with Ethanol Solvent Rahmawati, Istiqomah; Sa’roni, Achmad; Wardhani, Maharani Tri; Fachri, Boy Arief; Palupi, Bekti; Rizkiana, Meta Fitri; Amini, Helda Wika; Reza, Muhammad
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.41494

Abstract

Banana peel (Musa corniculata) is one of the superior plants in Indonesia which is rich in polyphenolic compounds as a source of antioxidants. The potential of polyphenolic compounds as antioxidants can be used as an alternative to reduce banana peel waste. This study aims to determine the total content of polyphenols and antioxidant activity of horn banana peel extract. Extraction used the Microwave Assisted Extraction (MAE) method with ethanol solvent and the variables were extraction time (4, 7, and 10 minutes), solvent concentration (50, 73 and 96 %), ratio of simplicia mass to solvent volume (1:12, 1 :8, 1:6 g/mL) with a microwave power of 150 Watt. Determination of polyphenol content using the Folin-Ciocalteau method and the ability of polyphenols as antioxidants were analyzed by DPPH test. This study used the Design Expert 13 Response Surface Methodology software, the Box Behnken type, to determine the extraction parameters for the total polyphenol content. The highest total polyphenol content was obtained at 354.02 mg GAE/g from the combination of parameters 50% solvent concentration, 10 minutes extraction time, and the ratio of horn banana peel powder to 1:8 g/mL solvent.
Analysis of Green Hospital Implementation in the Integrated Emergency Room Building Construction Project of RSUD K.R.M.T Wongsonegoro Semarang Based on Green Construction Site Index Firmawan, Ferry; Purwanto, Purwanto; Rahmawati, Diah
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.47137

Abstract

Construction activities have positive and negative impacts, one of the negative impacts is the generation of construction waste. As construction projects develop, waste generation also increases. As an effort to realize the concept of sustainable development in the health sector, the Directorate General of Health Services issued Guidelines for Environmentally Friendly Hospital (Green Hospital) in 2018. However, these guidelines do not contain guidelines for the implementation aspects of building construction. Therefore, the purpose of this study was to identify the factors, criteria, and indicators in the preparation of instruments for assessing aspects of the implementation of Green Hospital construction, and to analyze the results of the assessment. This research is qualitative using descriptive analysis method. The research results obtained 50 factors, 10 criteria and 3 indicators arranged in an assessment instrument called "The Construction Implementation on Eco Green Hospital Development". Analysis of the assessment results on the Phase I Integrated Emergency Room Building Construction Project of the K.R.M.T Wongsonegoro Semarang Hospital shows that the Green Construction Project Policy indicator with 4 factors out of 15 factors has been met, the Environmental Performance Management indicator with 4 factors meets out of 15 factors, and the Construction Waste Management indicator with 9 factors out of 20 factors has been met.
Diversity of Gastropods in The Mangrove Forest Area of Ujung Kulon National Park Widyasari, Siti Fauziah; Wahyuni, Indria; Usman, Usman
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.34174

Abstract

Various kinds of reseources in coastal areas are very important for us to maintain sustainability. We can find coastal area with varios kinds of ecosystems in Ujung Kulon National Park. This study aims to determine the diversity of gastropods in the mangrove forest area of Ujung Kulon National Park. Sampling used the line transect method and the purposive sampling method with low tide conditions. Sampling was carried out at three stations which are divided into three transects at each station. The transect line was drawn along 50 m with each transect made 5 plots with a size 1 x 1 m2 with a distance between plots of 10 m. This research was held in May-June 2021. The data analysis includes the index values of diversity, dominance, evenness, and abundance. The results of the gastropod obtained consist of 20 species from 7 different families so that diversity index value were included in the medium category with the highest diversity index value owned by station 1 with a diversity index value of 2,03 and the lowest diversity index value owned by station 3 with a value of 1,56. The gastropod abundance index value has an average value of 273 ind/m2.
Determination of Reducing Sugar Groups from Hydrolysis of Arthrospira platensis Microalgae using Microwaves Ma'mun, Sholeh; Rochmaningsih, Nur Ariffa; Nabila, Riqqah; Sumalyani, Aisyah
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.47304

Abstract

The depletion of fossil fuel sources and increasing carbon dioxide (CO2) emissions have encouraged research into renewable energy sources. Bioethanol is an environmentally friendly energy source with considerable potential for reducing dependence on gasoline. Bioethanol is produced from the fermentation process of monosaccharides. The first and second generations of bioethanol are derived from food crops, agricultural waste, and plantation waste, whereas the third generation is produced from microalgae. Arthrospira platensis is a carbohydrate-rich microalgae. This study attempts to determine the content of reducing sugar groups which are monosaccharides formed from a hydrolysis with microwaves. A total of 10 g of microalgae powder was added to 100 mL of 0.3 M H2SO4 solution. The hydrolysis process was carried out in a microwave reactor at a temperature of 100°C for 90 minutes. The hydrolysate obtained was then fermented with Saccharomyces cerevisiae anaerobically in a shaking water bath. The High Performance Liquid Chromatography (HPLC) test was performed to identify reducing sugar groups in the hydrolysate, and the Gas Chromatography (GC) test was performed to determine the concentration of bioethanol produced during the fermentation process. Meanwhile, the solid content of biochar that remained after hydrolysis was analyzed using Fourier-Transform Infrared Spectoscopy (FTIR). The HPLC test findings showed that the glucose concentrations before and after fermentation were 10.52 and 1.91 g/L, respectively, indicating that 81.8% of the glucose was converted to bioethanol. Furthermore, the distillation results from the fermented hydrolysate were analyzed using GC, yielding a bioethanol content of 3.90 g/L.
Analysis of Nanobubbles (NBs) Technology and Foliar Fertilization on the Growth of Phalaenopsis sp. Orchid Puspa, Andria; Rahayu, Tintrim; Jayanti, Gatra Ervi
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.39809

Abstract

Plants need nutrients which are then provided through fertilizers, but this can cause long-term problems due to limited absorption by plants so recently implemented NBs technology that can help reduce environmental pollution. This study aimed to determine the effect of NBsO2, NBsH2, NBsCO2, NBsN2 and, NBsO3 on the growth of Phalaenopsis sp. orchid plants. The research method was a complete randomized design (RAL) with 7 treatments (control without application of fertilizer and NBs, foliar fertilizer, NBsO2, NBsH2, NBsCO2, NBsN2, NBsO3) and 4 repeats. NBs were made using a nanogenerator with a flow of 5 liters/ minute and induced for 15 minutes. The data analysis used is the Multivariate Analysis of Variance (MANNOVA) test. The control and NBs treatments were given by dropping 5 ml on each orchid plant. The results showed that leaf length, number of leaves, plant weight and number of plant roots NBsN2 treatment had the best effect, while on root length, NBs O2 treatment had a better effect than other treatments. The application of foliar fertilizer is less effective to meet plant growth needs. At the same time, NBs are more effective because they are very small making it easier for plants to absorb.
Cover BST Volume 12 No 2 (2024) BERKALA SAINSTEK, Jurnal
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

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

Abstract

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