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Alfian Qomaruddin
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Universitas Trunojoyo Madura Jl. Raya Telang - Kamal, Bangkalan Kode Pos 69162
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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.
Arjuna Subject : -
Articles 504 Documents
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Perencanaan Sistem Penyaluran Air Limbah di Kecamatan Sumbersari Kabupaten Jember Dewi, Fauziah Rachma; Badriani, Ririn Endah; Kartini, Audiananti Meganandi
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.20016

Abstract

An increase in domestic wastewater if it isn’t treated properly, will potentially lead to a decrease in water quality. Existing conditions in Sumbersari Sub-district based on the preliminary survey, the domestic wastewater disposal is still mixed with the drainage network. This sewer then directly channeled into the water body without any prior treatment, this’s contrary to the PUPR Ministerial Regulation No.4 of 2017. The planning aims to network planning of Wastewater Distribution System in Sumbersari District. The planning service area is carried out in Sumbersari Sub-district, Antirogo Village isn’t included because it has the lowest population density and topography isn’t possible to be served. The planned wastewater is just graywater wastewater. The planning results concluded that the average wastewater discharge and peak wastewater discharge are around 178.19 L/s and 459.28 L/s. The planning is divided into 6 blocks and there’re 3 WWTPs to service the area. The planned pipe dimensions are 90-600 mm. There’re 3 pumps, 10 siphons, and 331 manholes for complementary building requirements. The total cost required for this planning is Rp53,477,911,716.
Aplikasi Tandon-Filter untuk meningkatkan Kualitas dan Kuantitas Garam dalam Teknologi Greenhouse Salt Tunnel di Pantai Selatan dan Utara Jawa Timur Amin, Abd. Aziz; Salamah, Lutfi Nimatus; Zamzami, Ilham Misbakudin Al; Susanti, Yogita Ayu Dwi; Yanuar, Adi Tiya; Kurniawan, Andi
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24877

Abstract

Salt is an essential commodity that concerns the livelihood of society and cannot be substituted by other commodities. East Java is the largest salt-producing center in Indonesia. The results of community salt production often still have NaCl content 95%. To achieve salt production results with NaCl quality 96%, research, and technology development are needed to eliminate impurities and improve the quality of the salt produced. One of the technologies being developed is the utilization of reservoirs and raw water filters. This research aims to analyze the application of reservoir and filter technology in improving the quality and quantity of salt production on the South and North Coasts of East Java using greenhouse salt tunnels. The results of this study indicate that the dynamics of environmental parameters and the quality of raw water on the South and North Coasts of East Java affect the results of the salt production process. The quality and quantity tests of salt with reservoir and filter application on the South Coast of East Java show NaCl quality of 98.13%, water content of 5.44%, and whiteness presentation value of salt 80.5% with production quantity of 7 kg/m². In trials on the North Coast of East Java, the salt quality was 98.25%, water content was 5.37%, and the whiteness percentage value of salt was 79%, with a salt production quantity of 7.8%. This research indicates that reservoir and filter technology can improve the quality and quantity of salt according to the characteristics of the South Coast and North Coast of East Java.
Revitalization of Indonesian Navy Language Education System in Promoting Human Resources Resilience Prasetya, Heri; Khusaini, Moh; Hamamah, Hamamah; Kusumaningrum, Adi
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24909

Abstract

The writer concentates on the research about Indonesian Navy language education system. The method of the research is decriptive qualitative. In resulting the outcome of education program,  there are some problem findings that are required to be solved: the education program curriculla that are still obsolete and temporary, the incompetent educators and educational staff, lack of the standardized education facilities, as well as the low intensity of education cooperation programs.The problems cause the education process of international languages not running well, so it cannot result the qualified Indonesian Navy’s graduates. To achieve the expected Indonesian Navy personnel’s graduates, the language education system in Indonesian Navy institutions can be revitalized by updating, establishing and composing the new education program curriculums, managing the human resources by adding more educators and educational staff, improving the professional development and providing more wellfare or rewards, standardizing the education facilities, such as classrooms, language laboratories, libraries, dormitories and course book references, as well as collaborating with the other foreign languange education units domestically, regionally and internationally. After that, the writer finds the strategy of revitalizing the language education system in Indonesian Navy units.  By revitalizing the system, it can result the qualified graduates of Indonesian Navy personnel that can support the Resilience of Human Resources.
Performance Evaluation of Dolomite Fertilizer Production: AHP and Scoring System Approach Based on Performance Prism Sholeha, Fitriatus; 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.v17i2.25701

Abstract

Fertilizer production often faces various performance issues that can affect efficiency and productivity. One of the main problems is the instability in the quality of raw materials, which can result in variations in the quality of the final product. Workforce performance is also a critical factor, where inadequate training and low motivation can reduce productivity. The lack of an appropriate performance measurement system, such as relevant and accurate Key Performance Indicators (KPIs), can make it difficult for companies to monitor and improve their overall performance. To address these challenges, a performance measurement system is needed that can integrate various aspects of the company (stakeholders). This performance measurement system must be able to accommodate the interests of various parties involved in the company's operations to produce more accurate and relevant information. The performance measurement approach referred to is known as the Performance Prism. It is then supported by using the Objective Matrix (OMAX) method to determine the ranking and class calculation of each KPI and the Traffic Light System (TLS). Based on performance measurements using the Performance Prism, Analytic Hierarchy Process (AHP), and Scoring System at PT. XYZ, there are 53 KPIs divided among various stakeholders. From this analysis, it can be concluded that the design of the company's performance measurement encompasses various aspects involving both internal and external stakeholders. The total performance index of 13.43 indicates overall good performance. In this case, the total KPIs used are 53 KPIs, which include 10 KPIs for employee stakeholders, 5 KPIs for owner stakeholders, 10 KPIs for customer stakeholders, 5 KPIs for government stakeholders, 4 KPIs for investor stakeholders, 10 KPIs for supplier stakeholders, 4 KPIs for partner stakeholders, and 5 KPIs for surrounding community stakeholders. According to the results of the Objective Matrix (OMAX) and Traffic Light System (TLS), it can be seen that 47 KPIs fall into the green category, indicating good achievement, while 3 KPIs fall into the yellow category, and 3 other KPIs fall into the red category, indicating areas requiring further attention for improvement.
Pengaruh Kombinasi Jumlah Piston dan Turbin Terhadap Performa Pembangkit Listrik Tenaga Mekanisme Oscillating Water Column Pratama, Fideryan Axel; Ulum, Miftahul; Noerpamoengkas, Ardi
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.19000

Abstract

The need for electrical energy is very high, but fossil power plants are running low. Consequently, innovations in alternative energy sources are increasing, including sea waves. The geographical location of Indonesia, which is a country with several islands and is accompanied by several beaches, has the potential to bring up innovations in alternative renewable energy, namely wave power plants. In Indonesia, several regions have used sea wave power plants with the OWC (Oscillating Water Column) system. Therefore, this study conducted an experimental OWC test of a piston and turbin as combination mechanism in a water wave power plant by combining the number of pistons and turbines in 3 variations, i.e., 1 piston with 2 turbines, 1 piston with 1 turbine, and 2 pistons with 1 turbine. This experiment compared the effects of the combination of the number of pistons and turbines on the torque, voltage rotation, mechanical power, electrical power, and efficiency of the three combinations. The research results indicated that the combination of 1 piston and 1 turbine produced the highest torque of 4.73 Nm, while the combination of 1 piston and 2 turbines yielded 0.76 Nm, and 2 pistons and 1 turbine generated 4.47 Nm. Out of the three combinations, the highest electrical and mechanical power occurred in the combination of 1 piston and 1 turbine at 8 watts and 298.4 joules per second, respectively, with a voltage of 0.89663 volts, a rotation of 603 rpm, and an efficiency of 10%.
Analisis Sebaran BOD dan TSS pada Sungai Kapuas di Sekitar PTPN XIII Rimba Belian Kabupaten Sanggau Larasati, Allisha; Winardi, Winardi; Purnaini, Rizki
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.v17i2.24586

Abstract

The research area, namely the Kapuas River, serves as a disposal site for waste from household activities, including bathing, washing, and sanitation (MCK), as well as waste from the industrial and plantation sectors. PTPN XIII Rimba Belian, located in Rimba Belian Hamlet, Semerangkai Village, Kapuas Subdistrict, Sanggau Regency, operates in palm oil (CPO) production, resulting in the formation of waste containing organic compounds such as BOD and TSS. Waste from the PTPN factory's wastewater treatment plant (IPAL) that enters the river can render the river unsuitable for use, leading to diseases, and may cause a decrease in the river's assimilative capacity. Therefore, modeling is needed to analyze the spread of BOD and TSS and calculate the assimilative capacity for pollution using the WASP 7.5 model. The objective of this modeling is to predict the river's assimilative capacity for pollution and the impact of changes in water quality caused by oil palm plantations around the Kapuas River in the research location. The modeling is conducted by segmenting the river into 6 segments. The results of this study indicate that the PTPN XIII factory plays a significant role in contributing to BOD and TSS parameters. The assimilative capacity for BOD in the research location shows positive values in all segments except for segment 4, which has a negative value. Meanwhile, the assimilative capacity for TSS pollution load shows positive values in all segments.
Kontaminasi Mikroplastik pada Ikan Kiper (Scatophagus argus) dari Laguna Segara Anakan, Cilacap Hidayati, Nuning Vita; Hotijah, Siti; Hudawi, Mohammad Nuh; Andriyono, Sapto; Sanjayasari, Dyahruri; Hastuti, Dewi Wisudyanti Budi; Hendrayana, Hendrayana
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.19543

Abstract

Microplastics are pollutants of emerging concern today. The presence of microplastics in fish from several marine environments has been reported worldwide. This study examined the presence of microplastics in the gastrointestinal tract (GIT) of the Kiper Fish (Scatophagus argus) from the Segara Anakan Lagoon, Cilacap, Central Java. Microplastics were found with an average abundance of 22.22 ± 6.8 items/ind. Fragment (45%) was the main type of microplastic found in the analyzed Kiper fish, followed by fiber (27%), film (21%), and pellets (7%). Eight types of colors were found in the analyzed fish, with black (43%) and transparent (33%) being the predominant plastic colors. There were 12 types of microplastic polymers found, namely Polystyrene (PS), Nylon, Polymethyl methacrylate (PMMA), Cellulose acetate (CA), Polycarbonate (PC), Polyvinyl chloride (PVC), Polypropylene (PP), Polyurethane (PU), Latex, Acrylonitrile butadiene stryrene (ABS), High-density polyethylene (HDPE), Polyethylene telephthalate (PETE). The results of this study indicate that more serious attention must be paid to the handling of plastic waste, given the accumulation of high amounts of microplastics in fish, which can be harmful to human health.
Implementasi Visual Studio pada Sistem Monitoring Daya dan Proteksi Rele Arus Lebih Menggunakan Automatic Transfer Switch/Automatic Main Failure (ATS/AMF) Disuplai oleh Kombinasi Grid dan Photovoltaic (PV) Riftianto, Andrian Eko; Amirullah, Amirullah
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.22151

Abstract

Monitoring power consumption and protecting the use of household electrical equipment with separate and remote Internet of Things (IoT)-based energy sources, is an important requirement in modern times. This paper proposes the implementation of a voltage and current monitoring system resulting from the output of an automatic transfer switch/automatic main failure (ATS/AMF) supplied by a PLN (grid) source and a photovoltaic (PV) generator. This power electronics device is used to control the combination of two separate energy sources automatically. The PZEM-004t sensor functions to read the value of the output voltage and load current from the ATS/AMF. Arduino-Uno is used to control the protection relay so that it is able to disconnect or connect load currents where the parameters of current, voltage and power as well as the performance of the protection relay are all monitored by Visual-Studio. Test results on eight loads, namely: 30 W LED lamp, 15 W LED lamp, solder heater, cellular phone charger, laptop charger, 5 W spiral energy saving lamp (LHE), 5 W bulb lamp, and portable fan using the PZEM-004t sensor monitored by Visual Studio and validated by a multimeter, the average error values for voltage and current measurements were 0.448% and 14.561%, respectively. The results of the relay protection test show that if the source is connected to a load that absorbs the load current below 0.6 A, then the trip indicator on the overcurrent protection relay has not turned on so that the protection menu display in the Visual Studio application is OFF. On the other hand, if the total load current exceeds 0.6 A, the trip indicator on the protective relay will light up so that the switch will cut off the load current. In this condition, the display of the protection menu in the Visual Studio application is in ON status.
Analisis Structural Equation Modeling (SEM) Pengaruh Transformational Leadership Terhadap Employee Performance Sari, Citra Arum; 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.v17i2.27158

Abstract

Performance results in a company can increase due to the influence of the transformational leadership style supported by how job satisfaction and behavior of its employees. Job satisfaction and OCB function to have a positive impact on employee performance, if employees are satisfied with what is given by their leaders, it will affect the progress of the company and feel encouraged to work better as well as the impact of OCB and transformational leadership on them, in terms of involving employees in voluntary work which ultimately improves performance. Contributions to this research so that in the future it can expand information and new references. This research also expands the literature by examining the mediating influence of OCB and provides new directions for researchers to study transformational leadership and OCB. The sampling method is purposive. The data collection technique begins with the distribution of an initial questionnaire (pre test) to 30 respondents, then continues with a sample of 150 respondents. The research was conducted quantitatively with the SEM (Structural Equation Model) Lisrel method. The results showed that transformational leadership has a positive effect on job satisfaction, organizational citizenship behavior and employee performance directly and job satisfaction and OCB have a positive effect indirectly.
Coral Fish Biodiversity Assessment on Different Locations (Case Study of the North Bali ICRG Area). Potje, Emilian Ivarlyano; Wiyanto, Dwi Budi; Giri Putra, I Nyoman; Demianus Hukom, Frensly
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24171

Abstract

Reef fish associated with artificial reefs are one indicator of success for artificial reef applications. This research was carried out in February 2023. Reef fish data was collected in three tidal conditions. Data of Coral fish was collected using the Underwater Visual Census (UVC) method. The data that collected includes abundance of species, individual abundance and fish size from 3 categories namely major, indicators and targets. From the results, the community structure at each location obtained the same diversity index and uniformity index which were classified as moderate to high and the dominance index was classified as low. For each tidal condition the diversity index obtained was classified as medium to high, the uniformity index is relatively high and the dominance index is low. The total abundance of species at each point ranges from 26 species represented by 13 families to 63 species represented by 19 families, and for each tidal condition it ranges from 11 species represented by 7 families to 42 species represented by 16 families. The total abundance of individuals at each point overall ranged from 1333-20,048 Ind/Ha, each tidal condition it ranges from 20- 980 individuals. The total biomass at each point overall ranged from 102,844- 1353,119 Kg/Ha, each tidal condition ranges from 2,154 to 63,780 kg. Based on the results, the species similarity index values at each point were categorized as medium, except for Les II and Galeri, which were classified as high, while the test results for each tidal condition ranged from medium to high at each point. Test results (Mann-Whitney) for each point based on individual abundance values and coral reef fish biomass generally showed significant differences except between the Gallery and Les II points, whereas for each tidal condition there were no significant differences. Based on the results of the Correspondence Analysis, it was found that there was a relationship between several types of fish with each research point and at each tidal condition, this shows that the artificial reef structure at each point and each tidal condition was successful in attracting fish populations.

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