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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.
Arjuna Subject : -
Articles 504 Documents
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Hubungan Suhu Permukaan Laut dan Klorofil-a Dengan Hasil Tangkapan Benih Lobster di Perairan Selatan Pulau Lombok Junaidi, Muhammad; Cokrowati, Nunik; Diniarti, Nanda; Dwi Hari Setyono, Bagus; Fitriani Mulyani, Laily
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.9055

Abstract

The waters south of the island of Lombok, Nusa Tenggara Province, are the location for lobster seed production. To maintain the sustainability of lobster seed resources, research is needed to know the distribution of Sea Surface Temperature (SST), chlorophyll-a and lobster seed catch and analyze the relationship between SST and chlorophyll-a on lobster seed catches. The research method used is a descriptive method that describes the state of SST and chlorophyll-a associated with the catch of seeds. Lobster seed catch data was obtained from the 2009-2013 lobster seed census, SST data and chlorophyll-a concentrations from 2009 - 2013 from the Aqua Modis satellite. The results showed that the distribution of sea surface temperature (SST) and chlorophyll-a in the Southern Waters of Lombok Island varied every season, with SST and high chlorophyll-a concentrations generally found in coastal waters and the concentration was decreasing towards the offshore direction. SPL and chlorophyll-a variables simultaneously had a significant effect on the CPUE of lobster seeds and partially SPL had no significant effect on the CPUE of lobster seeds, while chlorophyll-a had a significant effect.
Rancang Bangun dan Uji Kinerja Mesin Pemarut Singkong Tipe Silinder untuk Produksi Tepung Tapioka Darma Darma; Arif Faisol; Asti Sangaji Dahlia
Rekayasa Vol 13, No 3: December 2020
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v13i3.7071

Abstract

The development of agroindustry in rural areas has a strategic role because raw materials are commonly produced in the areas. One of the industrial sub-sectors that has bright prospects to develop in rural agroindustries in Indonesia is tapioca flour processing industry. The most important operatiion units in tapioca processing is rasping or grating, which is mechanical disintegration of the tuber cell’s wall in order to free the starch granules and it suspended into the water during the extraction process.  The objective of this study was to design and test the performance of cassava rasping machine powered by gasoline engine.  In the experiment, three levels of cylinder rotation speed i.e. 1500 rpm, 2500 rpm and 3500 and two feeding methods of cassava tuber i.e. perpendicular and pararrel/longitudinal to the cylinder were examined. Results showed that combination of cylinder rotation speed and feeding methods significantly affect the rasping performances. The highest performance was obtained at the condition of cylinder rotation speed of 2500 rpm with feeding method perpendicular to the cylinder.  The performance of the machine at the condition were (1) rasping capacity 488,91  kg h-1, (2) starch percentage 42,28%, (3) starch loss in waste 7,61% and (4) rasping effect  84,92%.
Analisis dan Model Standard Angkutan Laut: Studi Kasus Muatan Petikemas Achmadi, Tri; Abdan Hanif, Mohammad; Sina Khaqiqi, Alwi
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.10044

Abstract

The increase in container rates, which tends to be unstable, has an impact on the price of cargo per unit to increase. The uncertainty of the amount of cargo carried makes the tariffs imposed also unstable. The purpose of this research is to make a standard model of the cost of each unit and the size of the capacity of container transport services based on changes in cargo and distance of shipping routes. In addition, it analyzes the relationship between load factor and frequency on the gross income of a shipping company. The optimization method is used to get the size and cost per unit under certain conditions. The results of the analysis explain that the current tariff is not yet optimal, proven by the current cost equation y=2E+06x(-0,342) (R2= 0,238). Then to create a standard model of transportation, the equation for the cost line per container ship freight unit y=1E+09x(-0,759) (R2= 0,8634) while SPCB y=6E+07x(-0,59) (R2 = 0,8234). This study also produces an equation model for the size of the container ship transport capacity y=3E-05x+57,662 (R2=0,943) while SPCB y=2E-05x+94,446  (R2=0,997). The conclusion is using a sensitivity analysis of the carrying capacity with the current condition of ship operation patterns for the minimum load factor for the Surabaya-Ambon route 76% and Surabaya-Serui 48%. For a 100% load factor condition, it can reduce the cost per unit for the Surabaya-Ambon route by 50% and for the Surabaya-Serui route by 63%.
Perancangan Trainer Komunikasi Receiver Frequency Modulation sebagai Media Pembelajaran untuk Teknik Elektro Rahmawati, Diana; Ubaidillah, Achmad; Wahyuni, Ardian
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.7999

Abstract

On a Frequency Modulation (FM) receiver there is an interference caused which is usually due to the distance and strong signal from the FM transmitter carried to the FM receiver device. The system used PLL (Phase Loocked Loop) system on the oscillator. An oscillator is an electronic device that produces a voltage signal output. The use of oscillators as the carrier of the signal and the message signal produces waves with a certain frequency value, and has a frequency shift of 56,25KHz. The output of the FM receiver is a signal containing of the FM transmitter in the 88MHz-108MHz range. The signals received from the transmitter are short audio and sine signals, so they can be analyzed based on their waves in oscilloscopes and matlab experiments. In this trainer, there are tuners, IF amplifier, multiplexer demodulator, and digital counter frequency. The IC used is LA1260, LA3361, LB3500, LC7265. The result of making an FM receiver trainer get a satisfaction value of the practical test 80,12% based on aspects of media appearance, technical quality and usefulness. A device designed for UTM Electrical Engineering students as a trainer in FM telecommunications system learning medium practiced in the UTM Department of Electrical Engineering
Penerapan Green Quality Function Deployment Produk Keripik Singkong Mohammad Fuad Fauzul Mu'tamar; Raden Faridz; Aris Nurrahym
Rekayasa Vol 13, No 3: December 2020
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v13i3.7606

Abstract

The attributes of the product may have an impact on the quality of the product for consumers. Depending on this, the product development of the industry needs greater attention to the materials and hygiene used and to reduce the environmental effect of cassava chip production. This study aims to obtain product attributes according to customer desires and proposed priority technical requirements to produce environmentally friendly cassava chips in accordance with the Green Quality Function Deployment method. The first phase is the identification of the customer requirement attributes with the FGD approach, and the results obtained are the nine customer requirement attributes. The highest weight of customer requirement attributes is the attributes of environmentally sustainable manufacturing processes valued at 1.34. There are 17 attributes for the development of HAJA cassava chips (UD. HAJA) in line with the customer expectations of interviews with three experts. The first priority is the formulation of seasoning raw materials of 8,67 per cent contribution value, the second priority being energy utilized with a contribution value of 8,59 per cent.
Analisis Keberlanjutan Ekowisata Bahari Kategori Pantai Pantai Gua Manik dan Benteng Portugis di Kabupaten Jepara Rojana, Ahmad Rifqi Faqih; Muhsoni, Firman Farid
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.10798

Abstract

Marine ecotourism is a type of tourism activities related to the ocean including in coastal areas, above sea level and below sea level. Donorojo subdistrict has many coastal ecotourism that is used as a vacation destination as well as learning about science. This study aims to find out the sustainability status of coastal ecotourism and coastal ecotourism management strategy in Banyumanis Village, Donorojo District, Jepara Regency. The method used by this research were qualitative method and sustainability analysis using Rapfish. The value of sustainability status of the ecological dimension of Gua Manik beach was 84.62 (sustainable) and Benteng Portugis beach was 72.91 (quite sustainable). The economic dimension value of Gua Manik beach was 46.79 (less sustainable) and Benteng Portugis beach was 48.99 (less sustainable). The value of the social and cultural dimensions of Gua Manik beach was 66.45 (quite sustainable) and on Benteng Portugis beach was 44.13 (less sustainable). The value of the legal and institutional dimensions of Gua Manik beach was 40.89 (less sustainable) and Benteng Portugis beach was 43.69 (less sustainable). The overall sustainability status of Gua Manik and Benteng Portugis was 47.25 (less sustainable).
Monitoring Perkembangan Anak Usia Balita Berbasis Aplikasi Mobile Android Febriyanti, Nur Laili; Maulidiansyah, Maulidiansyah; Arifin, Zainal
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.11385

Abstract

Posyandu is a health activity organized by the community for the community, almost all villages have posyandu activities, including the village of Gunggun Lor. Posyandu in Gunggugan Lor in conveying schedule information, child development, and health information using the MCH book or orally when attending the Posyandu, the consultation process from the midwife is also face-to-face, the process has problems when the MCH book is lost and when the midwife or cadre forgets to convey the information needed, therefore an application is needed as an intermediary to convey the information, namely using a mobile (android) based application, with a modern development method, namely RAD (Rapid Application Development) toddler mother
Penguasaan dan Pengembangan Iptek Kemaritiman Guna Mewujudkan Indonesia Sebagai Poros Maritim Dunia Widodo, Widodo; Bandono, Adi
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12566

Abstract

Science and technology is always experiencing dynamics in the form of changes and developments. Industrial revolution 4.0. has brought new technology which is always characterized by cyber physical systems such as artificial intelligence, advance robotics, autonomous vehicles, 3d printing, virtual reality, and crypto currency, and others. The impact of the presence of these new technologies brings major and fundamental changes in various fields of life, including the maritime sector. The industrial revolution 4.0., has given rise to the phenomenon of shifting community activities which were initially carried out in the real world, now carried out in cyberspace. Everything is digital and all activities are done online with the help of internet media. In realizing the vision of the five pillars of PMD through the mastery and development of science and technology, several strategies are needed, including: (1) Building a maritime culture, through efforts: (a) the use and application of smart education technology, (b) carry out a cultural revolution or mental revolution, (c) build and expand internet network access infrastructure that is evenly distributed and reaches all regions of Indonesia. (2) Utilization of Maritime Natural Resources, with strategies, including: (a) Increasing the quantity and quality of exploration and management of natural resources classified as potential recoverable resources. (b) Increase the quantity and quality of exploration and management in the field of natural resources which are classified as potential non-recoverable resources, such as large oil and gas, minerals and mining materials. (c) Improving marine tourism management based on marine natural resources. (3) Development of Maritime Infrastructure and Connectivity, through efforts to prioritize the development of sea highways for inter-island domestic connectivity, by developing port infrastructure, and shipping and navigation safety infrastructure. (4) Improving Maritime Diplomacy, through strategies to strengthen diplomacy in the economic sector, diplomacy in the defense sector, and digital diplomacy. (5) Maritime Defense, through increasing the ability of defense equipment to defend the country's sovereignty, the territorial integrity of the Unitary State of the Republic of Indonesia, and the safety of all ethnic groups from all forms of threats.
Influence of Sand Casting Waste as Substitutor of Quartz Sand in Mortar Prasetya, Fandi Angga; Faria, Niswatun; Susanto, Tri Eddy; Firdaus, Rizqi Ni’amul; Zamzami, Yaski Achmad
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12451

Abstract

Sand casting waste has the potential to replace quartz sand in mortar manufacture because it contains high silica. This study uses sand casting waste from the steel industry in Gresik, Indonesia to observe how it affects the quality of the mortar. Initial characterization were carried out to determine the properties of the material, including; magnetic test which results are not attracted by magnets, moisture content test with a value of 0.328%, XRD test to determine the crystallinity content which results contain 99.52% Silica Quartz, and XRF test to determine the content of the compound in which results are 81.25% Silica dominant. Then observations were made by making mortar with the replacement of quartz sand by sand casting with variations of 0% wt, 25% wt, 50% wt, and 100% wt and then tested its compressive strength at 3 days, 7 days, and 28 days. Based on the research that has been done, the optimum result using sand casting is at 25% wt with a compressive strength of 251.15 kgf/cm2 at 28 days of age which is higher than the standard.
Perbandingan Metode Roberts’ Filter, Segmentasi dan Band Ratio Pada Citra Landsat 8 untuk Analisis Garis Pantai Prayogo, Luhur Moekti; Basith, Abdul
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.10300

Abstract

Computerization has an essential role in the field of remote sensing. Various methods for automatic coastline analysis continue to develop. This study aims to determine the performance of three methods, namely Roberts' Filter, Segmentation, and Band Ratio on Landsat 8 imagery, in producing land edges that are directly adjacent to the sea area (coastline). This study shows that the non-fusion image, the resulting edge, is less sharp than the fused image in the Roberts' filter method. The use of a 2x2 matrix on the Roberts' filter, the range of values from 0.52 to 0.56 in the segmentation method, and the Green Band Ratio - Near-Infrared produce various accuracy. The best method is produced by Band Ratio, where the edge detection results are close to the image's actual conditions. Meanwhile, unsatisfactory results are produced by the segmentation method.

Page 29 of 51 | Total Record : 504

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