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Alfian Qomaruddin
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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
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Articles 17 Documents
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Search results for , issue "Vol 17, No 2: Agustus, 2024" : 17 Documents clear
Aktivitas Antibakteri Ekstrak Bunga Telang (Clitoria ternatea L) terhadap Pertumbuhan Bakteri Staphylococcus aureus dan Escherichia coli Widyasanti, Asri; Febrianti, Febrianti
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22348

Abstract

Clitoria ternatea L. or commonly called butterfly pea is a vine that belongs to the fabaceae family. This plant is known to provide many benefits, one of which is as a natural antibacterial. Secondary metabolite compounds in C. ternatea are thought to be responsible for its antimicrobial activity. The purpose of this study was to determine the antibacterial activity of C. ternatea extract in inhibiting the growth of S. aureus and E. coli bacteria and to determine the interaction between the concentration of the extract and its growth. The method used was an experiment with a completely randomized design (CRD). The treatments given were variations in the concentration of C. ternatea extract by 20%, 40%, 60%, 80%, and 100%, positive control of meropenem and negative control of aquades. The C. ternatea extracts were also screened for phytochemicals for flavonoids, saponins, tannins, alkaloids, and phenols which showed positive results for these five compounds. The results of antibacterial testing proved that C. ternatea extract could inhibit the growth of S. aureus and E. coli bacteria and the concentration treatment had a very significant effect on the zone of inhibition. The antibacterial activity of C. ternatea extract was most effective at a concentration of 100% with the mean value of DDH against S. aureus bacteria was 8.44 ± 0.27 mm while against E. coli bacteria was 10.00 ± 0.73 mm. The concentration treatment of the tested C. ternatea extract had a very significant effect on the zone of inhibition of the two bacteria.
Pengaruh Servant Leadership Terhadap Employee Affective Well-Being dengan Mediasi Personal Growth dan Perceived Organizational Support Dimas Prabowo, Muhammad; Nugroho, Sukmo Hadi
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.27171

Abstract

The role of a leader is very necessary, with the hope that employees can also be involved in dealing with company problems that are experiencing a decline in performance. This research aims to determine the influence of servant leadership on employee affective well being, both directly and indirectly through the mediation of personal growth and perceived organizational support. This research is a development of previous research conducted on service management. Respondents were taken using purposive sampling. Data collection was carried out by distributing questionnaires to 140 employees. The data analysis technique used is the Lisrel Structure Question Modeling (SEM) analysis technique. The research results show that servant leadership is directly related to employee affective well being. Apart from that, servant leadership can be related to employee affective well being, so it will be mediated using personal growth and perceived organizational support. It is hoped that the contribution in the research will provide insight into science in human resource management and can become a new reference for Medical Device companies.
Rancang Bangun Trainer Kit Simulator Identifikasi Karakteristik Solar Cell Sebagai Media Pembelajaran Munadhif, Ii; Maulana, Kharisma Nizar; Jamiin, Mohammad Abu
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22323

Abstract

Solar panels consist of photovoltaic cells which are identical to diode semiconductor devices. Photovoltaics have a special point which is usually called MPP (Maximum Power Point). At that point, the photovoltaic is in an optimal state, both the voltage and current produced. The location of the MPP is unknown but can be found using calculations or a tracking algorithm called Maximum Power Point Tracking (MPPT). In general, MPPT uses the observe and observe algorithm which has shortcomings in determining the maximum power point because it is often trapped at the local maximum point. In this research, the MPPT algorithm used is based on a neural network with a buck-boost type converter. This method is done without requiring detailed information about photovoltaics. This MPPT will be used as a trainer kit for a simulator for identifying solar cell characteristics in the PPNS power electronics laboratory. The MPPT that has been created has an efficiency of between 80-92% and can increase the average power by 8-11.36% for monocrystalline solar panels and 1-13.05% for polycrystalline solar panels depending on the load used.
The Effect of Temperature Variation on the Liquefaction of High-Density Polyethylene Plastic Waste Alfernando, Oki; Marpaung, Gabriel Adi Pratama
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.24252

Abstract

This study aims to determine the comparison of oil yields obtained from processing HDPE plastic waste by comparing quantitatively and qualitatively the fuel oil produced. The processing of plastic waste into oil by pyrolysis process was carried out at a temperature variation of (400; 500; 600; 700; 800)°C for 120 minutes. In one experiment, 500 grams of plastic waste, 250 grams of dolomite catalyst, and 250 ml of H2SO4 solvent were required. This research was conducted at the Laboratory of SKL Engineering Department, Jambi University with the parameters tested including volume, mass, %-yield, density, and GC-MS analysis. The results showed that quantitatively the lowest volume, mass, and %-yield were at the 400oC temperature variation, and the highest at 500oC. At 500oC pyrolysis temperature variation, the resulting density was 0.744 grams/ml, and the results of GC-MS analysis produced carbon chains C5-C12 97.6081% (gasoline), C13 2.3919% (kerosene), and aromatic compounds contained in it amounted to 14.3786%.
Supply Chain Risk Mitigation Analysis on Coffee Comodities Using the Integration of FMEA and HOR Methods Wulansari, Ni Luh Made Pretty; Pulansari, Farida
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.25623

Abstract

Coffee has been a global commodity since its discovery, so it's not surprising that there are various coffee cultivation variations in different regions. Economically, coffee plays a significant role in coffee-producing countries, including Indonesia, where it is cultivated and produced. The company is one of the companies engaged in the manufacturing of powdered coffee production. In its efforts to meet market targets, the company faces challenges. Therefore, a supply chain analysis is conducted on the coffee production process to identify occurring risks. The resolution of issues in this research utilizes the integration of FMEA and HOR methods. The application of these integrated methods about supply chain risk mitigation analysis has also been widely developed. Based on the risk identification results in HOR stage I, there are 17 risk events caused by 25 risk causes. Out of 25 risk causes, 11 dominant risk causes are obtained based on ARP calculations. Then, in HOR stage II, 17 mitigation steps are designed to prevent or minimize the 11 dominant risks obtained from the HOR phase I calculations. After calculating the total effectiveness and degree of difficulty, the results of the mitigation effectiveness ranking based on the difficulty ratio (ETDk) with the highest value carried out routine preventive maintenance on milling equipment to prevent damage and process instability (PA 7) of 16143.21, and the last rank prepared a backup of coffee machines or critical components to reduce production downtime (PA 16) of 1406.16.
Pengaruh Stres Kerja dan Kerjasama Tim Terhadap Turnover Intention di Instalasi Rawat Inap Rumah Sakit Ananda Bekasi Amalia, Kartika Putri; Nugroho, Sukmo Hadi
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.27223

Abstract

Turnover intention or the desire to move is the tendency or intention of employees to quit their jobs voluntarily or move from one workplace to another. Burnout is an individual's response to work stress that occurs chronically and develops progressively which causes changes in health that affect work activities. The purpose of this study was to analyze the effect of work stress and teamwork on turnover intention and burnout as an intervening variable. The design of this study is observational analytic which aims to determine the relationship between variables through hypothesis testing, without intervening with the research subjects. The method used in this study is cross-sectional, by collecting data simultaneously at one time. Based on the entire series of analyses, it was found that burnout intervenes with work stress and teamwork on turnover intention so that by reducing work stress and increasing teamwork, burnout will be reduced so that it can reduce the turnover intention rate. Work stress and burnout have an impact on turnover intention, and teamwork has an impact on burnout.
Map of The Velocity and Direction of Ocean Currents During The East and West Monsoons of Manakarra Beach Mamuju Rosalina, Dwi; Rombe, Katarina Hesty; Sabilah, Anisa Aulia; Anisya, Ainun
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22560

Abstract

Current characteristics, including the type of dominant current, velocity, and direction, as well as the movement of ocean currents, cause the condition of a body of water to be dynamic. The aim of the study was to calculate the current direction and determine the direction of the west and east monsoon currents at Manakarra Beach in Mamuju. This study used the ARC GIS, Aviso, and MS Excel applications to utilize secondary data. The raw data were downloaded on Aviso to obtain the u and v vectors. The data obtained from Aviso was then processed into the MS Excel application to obtain the direction and velocity of the current. After gaining the current direction and velocity, the data were then visualized in the form of direction and velocity using interpolation analysis in ARC GIS. The results of the study were in the form of current velocities in Manakarra waters in 2022 in the west monsoon (reaching the highest number of 0.876561 m/s and the lowest number of 0.06885 m/s), and in the east monsoon the current velocity reached the highest number of 0.53816 m/s and the lowest number of 0.07355 m/s. In addition, the current direction in Manakarra waters in 2022 in the west monsoon had three directions, namely from the northwest, west, southwest, and ends in the northeast. In the east monsoon, there were three current directions in Manakarra waters, namely from the east, northeast, southeast, and partly from the northwest.

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