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BERKALA SAINSTEK
Published by Universitas Jember
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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 211 Documents
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Mobile Tracking Membership Application on PT. LP Expedition Denpasar I Gusti Ayu Agung Mas Aristamy; Moh Alif Al Lukman
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.31172

Abstract

PT. LP is a company engaged in freight forwarding which currently has 3500 partners spread throughout Indonesia and one of them is in Denpasar City. Customers owned by PT. The prison located in Denpasar City currently has more than 200 people. However, because PT. LP has not utilized technology in its entire business process, causing several activities at PT. LP becomes ineffective and efficient. Customers are often confused when they want to use a pickup service and cannot find out where the package is sent, because there is no facility to track the status of the package. When the customer wants to pick up the packages, the customer must first confirm via WhatsApp to the admin, include the address where the packages are picked up and also if the customer wants to make a cashless payment, the customer must contact the admin to ask for an account number. In addition, whenever PT. LP held a promo, the information did not reach all customers. The purpose of this research is to provide a solution to these problems by building a membership tracking mobile application which will later be able to help PT. LP to simplify and speed up the process of pickup, tracking the packages, and payments. This study uses the waterfall method and chooses Android as the platform used. The results of this study are an Android-based mobile tracking application that has features of packages pickup, tracking of the packages to be picked up, providing information and promo notifications to customers, and payment features.
Effect of Duck Egg Shell Ash with Fly Ash as Cement Substitution in Geopolymer Concrete Deka Larasati; Dwi Nurtanto; Nanin Meyfa Utami
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.29080

Abstract

The increasing production of cement as a basic material for making concrete is due to the increasing demand for concrete throughout the world. Innovative materials are needed as a substitute for cement to reduce the greenhouse effect, fly ash is pozzolanic which in fact has the potential to replace Portland cement as the main ingredient of concrete, and duck eggshell flour has good prospects to be used as an additional precursor material for geopolymer concrete. This study aims to determine further variations of the proportion of duck egg shells, the mechanical properties of the concrete produced using duck egg shell ash with fly ash. This study used an experimental method with the percentage of duck egg shell ash at 0%, 5%, 10%, and 15% of the total use of cement. Using Na₂SiO₃ and NaOH as activator with a concentration of 14M. At the age of 7 and 28 days with room temperature treatment. This study resulted in duck egg shell ash being able to increase the compressive strength of concrete at the age of 28 days with the percentage of substitution up to 5% with a value of 59.26 MPa, in the porosity test the minimum value was at the age of 28 days at a percentage of 5% 0.403%, and the value of the modulus of elasticity. experienced an increase in value at a percentage of 5% with the result 36071.43 MPa. Duck egg shell ash with a proportion of 5% is the optimum substitution where the compressive strength, porosity and modulus of elasticity tests on geopolymer concrete have linear values.
Habitat Characteristics of Long-Tailed Macaque (Macaca fascicularis Raffles, 1821) in Kucur Resort at Alas Purwo National Park Arif Mohammad Siddiq; Dewi Erna Wati; Hari Sulistiyowati; Retno Wimbaningrum; Rendy Setiawan; Dudun Supriadi
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.31613

Abstract

The Long-Tailed Macaque (LTM) (Macaca fascicularis Raffles, 1821) is a member of the Cercopithecidae which is included in the Vulnerable status. Information on the habitat characteristics of these species is needed to support in-situ conservation efforts. This study aims to determine the habitat characteristics of LTM in Kucur Resort at Alas Purwo National Park (APNP) based on the forest strata occupied by the LTM, Normalizes Difference Vegetation Index (NDVI), and river distance. The research procedure begins with a preliminary survey to determine the six lines of observation. The data used are primary data (LTM encounter points, forest strata they occupy, and data on tree species where they meet) and secondary data (NDVI variables and river distance). Both data were analyzed using a Geographic Information System (GIS) approach. The results showed that the LTM at Resort Kucur TNAP was found in four different groups. The results of data analysis show that the habitat characteristics of the LTM in Kucur Resort based on the forest strata it occupies are at a tree height level of 0-30 meters (strata E-B) which has branches, canopies, and produces young leaves and fruits. Furthermore, the LTM habitat has vegetation characteristics with medium density and cover which has an NDVI value of 0.3-0.5. This indicates the character of this habitat is used as a place to rest, socialize, and avoid from predators. Based on the distance of the river, the habitat characteristics are the location which is quite far from the river, which is > 300 meters. Based on the data on the habitat characteristics of LTM, it shows that Kucur Resort provides a fairly good habitat for the LTM.
Information Technology Governance Audit at XYZ College Using COBIT Framework 2019 Samsinar Samsinar; Rudolf Sinaga
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.30325

Abstract

Reliable and up-to-date information services are one of the parameters for the achievement of an organization's performance, including for a university, which is currently required to be able to adapt to technological advances to produce graduates who can master information technology to support the competence of their respective fields. The curriculum changes launched by the current government are also proof that the application of information technology in higher education is a must. Seeing this, universities have a difficult task, especially at the implementation stage of implementing information technology, because they must prepare not only infrastructure but also human resources who can develop good information system governance. Therefore it is necessary to carry out an IT governance audit. From the results of observations made, XYZ College has utilized information technology in academic services and other information services. However, it was found that information technology governance does not yet have a standard so that it is considered not to be able to meet the desired goals, and instead will cause various problems including uncontrolled operational costs and other problems. The purpose of this study is to measure the performance of information technology governance at XYZ College using the COBIT 2019 framework. Based on the results of an audit conducted from 7 EGIT components, namely processes, organizational structure, information flow and items, people skills and competencies, policies and procedures, culture, ethical behavior, and service infrastructure and application are on average at level 3, it can be concluded that the application of information technology has been running, the infrastructure is adequate but does not have good governance procedures or standards. It is recommended that XYZ Higher Education make standards for information technology governance as well as periodic evaluations of the use of all components of information technology, both software, hardware, and brainware.
The Quality of Pedestrian Based on Pedestrian Environment Quality Index (PEQI) Standards in the Cultural Heritage Area of Tunjungan Street Surabaya Khoudiy Iffiyah; Eko Budi Santoso; Rulli Pratiwi Setiawan
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.28408

Abstract

Tunjungan Street is one of the historical tourist destinations and one of the Cultural Conservation Areas in Surabaya. The use of pedestrian in Tunjungan Street is classified as high because it is a downtown area with various activities and its use as a pathway to access Cultural Conservation buildings. Many visitors use the pedestrian as an area to enjoy the Cultural Conservation building while walking along Jalan Tunjungan or as a photo point with the Cultural Heritage building in the background. This study aims to analyze the quality of pedestrian to determine the feasibility of infrastructure and pedestrians so that they can be an indicator of the completeness of pedestrian facilities in the Tunjungan Street Cultural Heritage Area. In this study, the problems that exist in the existing condition of the pedestrian path are investigated and studied regarding the quality of the pedestrian. The method used in this study was a quantitative method by assessing the quality of the pedestrian and scoring based on the Pedestrian Environmental Quality Index (PEQI) standard on both pedestrian sections of Jalan Tunjungan. This study indicates that the pedestrian in the Cultural Heritage Area of Jalan Tunjungan Surabaya meets the basic quality according to the calculation of the PEQI index with a total score of 60.77. This means that the pedestrian in the Cultural Heritage Area of Jalan Tunjungan Surabaya is suitable for use as a pedestrian that pays attention to the safety of road users for all. However, improving the quality of the pedestrian path to a reasonable rate will be better so that visitors can enjoy the pedestrian path facilities more appropriately and become the main attraction for visitors and become the pride of the people around the Cultural Conservation Area.
Analysis of Two Dimensional Sensitivity as Decision Support Alternative Waste Management in TPST Bantargebang Tatan Sukwika; Nugroho Budisatrio Sukamdani; Maya Dewi Dyah Maharani
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.31293

Abstract

The importance of waste management at the TPST Bantargebang Bekasi is very high. Some sensitive issues such as pollution, social issues, and the requirement of wider area are several issues needed to be considered further. Therefore, this study tries to highlight the best alternative in waste management at the TPST Bantargebang with a two-dimensional approach using AHP (Analytical Hierarchy Process) analysis. Through a two-dimensional approach, it is hoped that adequate priority options can be found regarding alternative integrated waste management at the TPST Bantargebang Bekasi. Collecting data through expert interviews assisted by questionnaires, supported by other sources of data and information from various relevant agencies. The results of the two-dimensional sensitivity graph from the iteration of the three-goal criteria pair, namely waste management innovation, expansion of the TPST area, and strengthening regulations show that alternative decisions in integrated waste management at the TPST Bantargebang several times have raised alternatives to increase Human Resources (HR) to support activities. In conclusion, the most important alternative decision is to increase human resources. The policy implication of this study is that it is necessary to add more educated staff at the Bantargebang TPST so that the target of serving the needs of the community in terms of waste management can be carried out effectively, therefore, increasing human resources both in terms of competence and number is a priority to support the development of integrated waste management at the TPST Bantargebang.
Fuzzy Employee Placement Suitability Assessment using Mamdani Fuzzy Method Renny Afriany; Rudolf Sinaga; Samsinar Samsinar
BERKALA SAINSTEK Vol 10 No 2 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i2.30280

Abstract

For a company, employees are the spearhead for the company because they have a function as Customer Service, customer satisfaction is obtained after interacting with the company through the performance of its employees. Employees are expected to meet all customer needs with the applicable regulations in the company and become a source of income for the company. To get reliable employees, one way is to assess the suitability of their placement in the appropriate position. With the assessment of the suitability of positioning, companies can consider and determine the provision of rewards, promotions, punishments, training, coaching, counseling, or transfers for their employees. The choice of method used to assess the suitability of employee placement in a company is Fuzzy Mamdani. With the Fuzzy Mamdani method, a system that is completely measurable and human assessments that tend to be immeasurable can be bridged. Assessment of the suitability of employee placement using the resulting fuzzy method, is expected to be an alternative solution for companies to give positions to their employees.
Essential Oils Activity of Legundi Leaf (Vitex trifolia L.) as A Repellent for Rice Weevil (Sitophilus oryzae) Afghani Jayuska; Warsidah Warsidah; Nurul Asikin; Ari Widiyantoro; Anthoni B. Aritonang
BERKALA SAINSTEK Vol 10 No 1 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i1.31011

Abstract

Legundi (Vitex trifolia L.) is a plant that contains essential oils. Legundi leaf essential oil has the potential as a more environmentally friendly rice lice repellent. The process of extracting essential oils from Legundi leaves uses the steam-water distillation method. The yield obtained from distillation is 0.10% with a bright yellow color, has a distinctive smell of Legundi oil with a specific gravity of 0.9065 gram/cm3. GC-MS search results showed that Legundi leaf essential oil contains 5 main components, namely 2-β-Pinene (16.18 %), trans-caryophyllene (13.75 %), β-Ocimene (11.16 %), Cyclohexanol (10.03%), and Eucalyptol (5.45%). Testing of repellent activity was carried out on rice lice with variations in volatile oil concentrations of 1%, 5%, 10%, and 20%. The results of the repellent test showed that the highest percentage occurred at a concentration of 20% (P4), which was 56.7%, with an application time of 120 hours (L5). Based on this, it can be said that the greater the concentration of the essential oil used, the higher the percentage of rejection of the population, this also indicates that Legundi leaf essential oil has lice repellent activity (Sitophilus oryzae).
Hazards Identification and Risk Assessment In Welding Confined Space Ship Reparation PT. X With Job Safety Analysis Method Muchammad Aunur Rofiq; Ali Azhar
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
Comparative Analysis of CPM, PDM and PERT Methods in Ship Repair Scheduling Planning KN. RB 309 Ternate 01 Laily Okta Oktafiana; Intan Baroroh
BERKALA SAINSTEK Vol 10 No 3 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i3.32479

Abstract

A ship that is still carrying out sailing activities must always be in a state that is in accordance with the classification and statutory. Maintenance or repair is needed for the ship in order to stay in good condition and fit to sail. In a ship repair project, there are several important aspects that need to be considered in order to complete project activities quickly and precisely. PT. XYZ has carried out ship repair activities, but the repair activities have been delayed due to weather factors, and the late procurement of spare parts. This research was conducted by analyzing the three models of scheduling fiberglass ship repair projects using Microsoft excel and using the CPM (Critical Path Method), PDM (Precedence Diagram Method) and PERT (Project Evaluation and Review Technique) methods. Results from the CPM method on 48-day A scheduling, 33-day B scheduling, and 21-day C scheduling. Pdm method results scheduling A 48 days, scheduling B 33 days, and scheduling C 21 days. In the PERT method the project can be completed in 48 days which is 48.67%, scheduling B 34 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days i.e. 99.35% and scheduling C 22 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days which is 99.99%.

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