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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 10 No 4 (2022)" : 8 Documents clear
Hazards Identification and Risk Assessment In Welding Confined Space Ship Reparation PT. X With Job Safety Analysis Method Rofiq, Muchammad Aunur; Azhar, Ali
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.32669

Abstract

PT X is a docking and shipyard company with experience in repairing various types of ships. Dangers and risks are always exist in every job including ship repair. Therefore, it is necessary to identify hazards and risk assessments. Welding in a confined space includes work that is a source of danger that has the potential to threaten the lives of workers in the ship repair process because access to and exit is limited and is not made to be a continuous work place. The purpose of this study is to identify hazards and assess risks in PT X ship repair confined space welding. The method used in hazard identification and risk control is Job Safety Analysis (JSA) with direct field observations and calculation of likelihood, concequences, and risk values. score on risk assessment according to AS/NZS 4360:2004 and with expert judgment. The results of this study identified that there were 49 potential hazards, then a risk assessment was carried out and there were 36 risks at low risk levels and 13 risks at moderate risk levels. The recommendations given include: using PPE and suction blowers when working, not entering the tank before it is declared safe, taking safety briefings seriously and worker absenteeism, tidying up cables and placing them in a safe position, ensuring workers' hands are dry when in contact with electricity, paying attention to attitude working conditions and conditions around the work area to always be alert
Bending Strength of Apus Bamboo Fiber Reinforced Asphalt Composite Materials as Small Ship Susanto, Eko; Maheswara, Yulian; Widodo, Akhmad Basuki
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.32604

Abstract

Bamboo is generally widely used as a material or construction material in homes. However, the use of bamboo as a raw material for shipbuilding is not yet available. To make bamboo as a material in shipbuilding, the bamboo is assembled or made into a composite to meet class standards as a material for shipbuilding. In this study, the composites used were apus bamboo fiber and asphalt. The method of making the composite uses the hand lay-up method with variations of 1 layer of reinforcement, 3 layers of reinforcement, and 5 layers of reinforcement. The dimensions of the test specimen size refer to ASTM D 790-3 which is then carried out by bending tests to determine the strength of the material due to loading and the elasticity of the material. Furthermore, the results of the bending test will be analyzed using the Anova method and compared with the standard material class in ship construction. Results Asphalt composite material with apus bamboo fiber has the highest bending test value of 27,068 Mpa and the lowest bending test value of 25,998 Mpa. Based on these results, it is stated that the Bamboo reinforced asphalt (BRA) material has not been able to match and even exceed the Bamboo reinforced plastic (BRP) material in the woven, non-woven and random fiber variants. It is influenced by the diameter, and the strength of the shape between the fiber and the matrix.
Effect of Nozzle Tip’s Variation to The Duration and OXY-LPG Gas Consumptions Using Manual CuttingMethods in Shipyards Mardhotillah, Zahro Wanda; Kristiyono, Tri Agung; Aditya, Bagus Kusuma
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.32389

Abstract

In maritime industry, especially shipbuilding in Indonesia, various of cutting processes are implemented, which one is Gas Manual Cutting. Generally, gas requirements and duration of plate cutting processes are calculated based on previous work experience. The use of different nozzle tips by the operator will affect to gas consumption and cutting duration in each process. The purpose of this study was to determine the effect of variations in the tip-nozzle size on the duration and OXY-LPG gas requirements in manual plate cutting. The research was conducted using an experimental-based research with linear regression analysis using the ANOVA method. Based on the results of data analysis, it can be known that the larger the diameter of the nozzle tip, the requirements for OXY-LPG gas will increase by following the equation ????=0,1117????+0,3533 for Oxygen and ????=0,025????+0,0489 for LPG. Meanwhile, the larger of nozzle tip diameter can cause a decrease in the cutting duration required by following the regression equation ????=−28,603????+293,01.
Performance of Ceramic Membrane Modified with Corncob Activated Carbon for Efficient Remazol Red Removal in Batik Wastewater Ardiyanto, Muhammad Malik Firdaus; Rahmayanti, Maya
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.34941

Abstract

A ceramic membrane modified with corncob activated carbon (CMCC) has been successfully prepared and used to reduce the concentration of remazol red in batik wastewater. This research aims to study the effect of corncob activated carbon (CC) in the ceramic membrane on the porosity of the ceramic membrane and its ability to reduce the concentration of remazol red dye in batik wastewater. The variation of % CC to the mass of clay used was 0%, 5%, 10%, 15%, 20%, and 25%. Characterization of CC includes ash content and characterization of CMCC includes porosity test, morphological analysis, and elemental distribution based on SEM-EDX. The results showed that the ash content of CC before and after activation was 5.625% and 2.974%, respectively. The CMCC porosity test results showed that the more CC added, the greater the porosity of the ceramic membrane. The elemental composition in CMCC is dominated by O, Si, Al and C. The addition of 10% CC obtained the optimum composition on a ceramic membrane. % removal of remazol red is 83.9%. The COD values of batik wastewater before and after processing with CMCC were 484.286 and 26,339 mg/L, respectively.
Implementation of K-Means Clustering Method for Trend Analysis of Thesis Topics (Case Study: Faculty of Computer Science, University of Jember) Irianto, Maulana Rafael; Maududie, Achmad; Arifin, Fajrin Nurman
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.29524

Abstract

The development of information technology causes a large number of digital documents, especially thesis documents, so that it can create opportunities for students to take the same and not varied topics. Thesis documents can be grouped by topic by identifying the abstract section. The results of the grouping can be seen with the trend with data visualization so that it can be analyzed to find out the trend of each topic. Retrieval of data in the repository of the University of Jember through a web scraping process as many as 490 thesis documents for students of the Faculty of Computer Science, University of Jember. The preprocessing stage is carried out by text mining methods which include cleaning, filtering, stemming, and tokenizing. Then calculate the weight of each word with the Term Frequency - Inverse Document Frequency algorithm, followed by the dimension reduction process using the Principal Component Analysis algorithm, which is normalized by Z-Score first. The outliers removal process is carried out before classifying documents. Furthermore, document grouping uses the K-Means Clustering method with Cosine Similarity as the distance calculation and the Silhouette Coefficient algorithm as a test. The test results were carried out with various k values and the optimal value was obtained at k = 2 with a Silhouette value of 0.80. Then the topic detection uses the Latent Dirichlet Allocation algorithm for each cluster that has been formed. Each cluster is visualized with a line chart and Trend Linear algorithm and analyzed to find out the trend. From the results of the analysis, it can be concluded that the topic of Decision Support System Development is trending down, and the topic of IT Performance Measurement and Forecasting is trending up. It can be concluded that the topic of Decision Support System Development needs to be reduced so that other topics can emerge.
Green Open Spaces as Butterfly Refuge Habitat: Potential, Issues, and Management Strategies for Butterfly Conservation in Urban Areas Azahra, Siva Devi; Rushayati, Siti Badriyah; Destiana, Destiana
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.33123

Abstract

One of the ecological functions of green open space (RTH) is to accommodate biodiversity in urban areas by providing a habitat for wild plants and animals. Pollution, urbanization, and various other environmental pressures make green open spaces in urban areas more susceptible to disturbances, both natural and due to human activities, which can affect the existence of biodiversity within them, including butterflies, which have specificity and sensitivity to certain environmental conditions, thus acting as bioindicators. Assessment of butterfly species, habitat conditions, and assistance with problems was carried out at four green open space locations in the East Jakarta Administrative City (DKI Jakarta Province) and four green open space locations in Pontianak City (West Borneo Province) to determine the potential and effectiveness of green open space as habitat protection for butterflies. The assessment was carried out by observing the presence of butterflies using the time search method and measuring the environmental factors that form the habitat and their correlation with the butterfly community through quantitative analysis. The results of the study showed that there were 22 species of butterflies in green open space in the East Jakarta Administrative City and 17 species of butterflies in green open space in Pontianak City. Correlation analysis at the eight green open space locations showed the same pattern, namely that the occurrence of butterfly species increased along with the number of forage plant species (as hosts or food plants) and canopy density (as shelter plants). The clustered shape of green open space is also a characteristic of green open space, which supports the function of green open space as a refuge habitat for butterflies in urban areas.
Risk Analysis of the Causes of Delay in Ship Construction (Case Study of KM CL 9E Ship Construction) Gazali, Goldy Sandy; Baroroh, Intan
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.32674

Abstract

In shipbuilding work, the risk of delays must be analyzed and anticipated so that such delays do not occur and cause losses for both parties. This study aims to calculate the risk of a shipbuilding project using the Failure Mode and Effect Analysis (FMEA) method. The final result obtained is the result of the calculation of the Risk Priority Number (RPN) in determining what risks can af fect shipbuilding work. There are two jobs with RPN value > 200 which are classified as High Risk namely errors in lofting and damage to the pulley block as a supporting tool. The plans for risk management with the highest RPN value are then discussed with th e shipyard. Risk mitigation is carried out on the possible risk of errors in lofting, namely by adding worker personnel in the loft ing workshop who serve as supervisors and examiners. While the risk of breakage of the trough can be overcome by paying attention to the inventory and also the condition of the tool.
Cover BST Volume 10 No 4 (2022) SAINSTEK, Jurnal BERKALA
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

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

Abstract

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