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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 16 Documents
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Search results for , issue "Vol 13, No 3: December 2020" : 16 Documents clear
The Effect of Curing Pressure and Duration on Mechanical Strength of Ultrahigh Molecular Weight Polyethylene/High-Density Polyethylene Composite as An Alternative Material for Windmill Turbine Febrianti Nurul Hidayah; Johan Boss
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.v13i3.8703

Abstract

The use of steel in building or construction manufacture continues to decrease, owing in part to the sustainability and mechanical properties of fibers which have higher strength in minimum weight than steel. This preliminary study was defined to evaluate the mechanical properties of high-performance fibers, especially ultrahigh molecular weight polyethylene (UHMWPE), in terms of the composite to be the main material of windmill turbines. It was UHMWPE as reinforcement and high-density polyethylene (HDPE) as a matrix in this composite system. The composites were processed in a variety of pressure and duration (50 to 165 bar and 10 minutes to 48 hours). The mechanical strength was tested by 3-point bending tests to measure the interlaminar shear strength, shear modulus, and bending strength. The result showed a significant difference in properties of the composite which is higher pressure and longer duration obtained a higher value of mechanical strength.
Karakteristik Kondisi Mangrove di Desa Taddan Kabupaten Sampang Firman Farid Muhsoni
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.v13i3.9146

Abstract

Mangroves are intertidal plants found along tropical and non-tropical coastlines which  is flooded by tides in brackish areas. Mangroves ecosystems  have experienced a very large decrease in area especially in Madura region. This research was conducted in Taddan Village, Camplong District, Sampang. The objectives of this research were to identify mangrove vegetation, mangrove area and mangrove characteristics. The area of mangroves in the research location was 48 ha. There were 7 types of mangroves found, e.g Rhizophora apiculata, Rhizophora stylosa, Rhizophora mucronata, Sonneratia alba, Sonneratia caseolaris, Avicennia marina and Avicennia alba. The type of substrate in the mangrove research location was mainly mud. The distribution pattern of mangroves at the research location tends to spread in groups, with a low level of mangrove diversity. The uniformity index value is balanced, or in other words, there are individuals who dominate. The average sediment depth is 24.7 cm, the average salinity is 36.7 ppt, the average water pH is 5.3, the average DO is 5.9 mg / l, the average water temperature is 31, 70C, the average soil pH is 6.4. Further analysis concluded that  environmental parameters in the area was  unsuitable for marine tourism.
Analisis Kekuatan Rangka Pada Mesin Transverse Ducting Flange (TDF) Menggunakan Software Solidworks Eko Prasetyo; Rudi Hermawan; Muhammad Naufal Ibnu Ridho; Istihara Ibnu Hajar; Hasan Hariri; Erlanda Augupta Pane
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.v13i3.8872

Abstract

In the industrial world, companies are required to be more effective and creative with the development of today's technology. Transverse ducting flange (TDF) machine is a machine that functions to make ducting flange products and form ducting connections, where there are several components in large quantities, so the design of the frame construction made must be strong to support these components. Responding to the cases that occurred, with the aims and objectives of this study, namely to determine the level of efficiency in the use of the design on a hollow galvanized steel frame measuring (100 × 50 × 3,2) mm, by performing simulations using SolidWorks Premium 2019 software with static analysis features. using the finite element method. So with this research, we can find out whether the frame is receiving loads that exceed the yield strength limit or vice versa. The results of the research are three load-bearing areas received, with load values in a row, namely 11693,809 N, 266 N, and 598,206 N. From the results of the three, it shows that the design of the frame construction that has been made is safe to use, because the calculation of the analysis meets the value requirements safety factor and the maximum stress simulation that occurs does not exceed the yield strength limit of the frame material.
Normalization based Multi-Criteria Collaborative Filtering Approach for Recommendation System Noor Ifada; Nur Fitriani Dwi Putri; Mochammad Kautsar Sophan
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.v13i3.8545

Abstract

A multi-criteria collaborative filtering recommendation system allows its users to rate items based on several criteria. Users instinctively have different tendencies in rating items that some of them are quite generous while others tend to be pretty stingy.  Given the diverse rating patterns, implementing a normalization technique in the system is beneficial to reveal the latent relationship within the multi-criteria rating data. This paper analyses and compares the performances of two methods that implement the normalization based multi-criteria collaborative filtering approach. The framework of the method development consists of three main processes, i.e.: multi-criteria rating representation, multi-criteria rating normalization, and rating prediction using a multi-criteria collaborative filtering approach. The developed methods are labelled based on the implemented normalization technique and multi-criteria collaborative filtering approaches, i.e., Decoupling normalization and Multi-Criteria User-based approach (DMCUser) and Decoupling normalization and Multi-Criteria User-based approach (DMCItem). Experiment results using the real-world Yelp Dataset show that DMCItem outperforms DMCUser at most  in terms of Precision and Normalized Discounted Cumulative Gain (NDCG). Though DMCUser can perform better than DMCItem at large , it is still more practical to implement DMCItem rather than DMCUser in a multi-criteria recommendation system since users tend to show more interest to items at the top list.
Analisis Indeks Kesesuaian Lokasi Garam (IKG) di Kawasan Sentra Produksi Garam Jawa Timur Andi Kurniawan; Riski Agung Lestariadi; Rika Kurniaty; Tri Budi Prayodo; Citra Satrya Utama Dewi; Abd Aziz Amin; Adi Tiya Yanuar; Lutfi Ni'matus Salamah
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.v13i3.9130

Abstract

Salt is an essential commodity that is widely used for consumption and industrial purposes. One of the main factors determining the success of this salt production is the suitability of the salt production location. However, there has been no analysis of the suitability of salt production locations in salt production centers in East Java. This study aims to analyze the suitability level of the location of salt production centers for the salt production process using the Salt Location Suitability Index (IKG). The areas analyzed in this study are salt production centers in Sampang Regency, Probolinggo Regency, Gresik Regency, and Tuban Regency. The IKG analysis is prepared based on nine suitability parameters: rainfall, soil permeability, soil type, duration of exposure, humidity, wind speed, air temperature, evaporation rate and saturation level of raw material water. The IKG analysis results can also be used as a basis for recommending alternative technologies that need to be applied to increase salt production. The results of this study indicate that the locations of salt production in Sampang District, Probolinggo Regency and Tuban Regency, which are the focus of this study, are in the Very Appropriate category (more than 85%), while the locations in Gresik Regency are in the Sufficiently Suitable category (80-84 %). Based on the results of this study, all the locations that are the focus of this study are suitable for further development of salt production.
Klasifikasi Gerakan Tangan Menjadi Suara Menggunakan Neural Network Muhammad Arifan Lizamanihi; Ii Munadhif; Mohammad Abu Jami'in
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.v13i3.6614

Abstract

Pemetaan Kesesuaian Perairan untuk Budidaya Laut di Perairan Pesisir Kabupaten Situbondo dan Banyuwangi Jawa Timur Zainul Hidayah; Apri Arisandi; Maulinna Kusumo Wardhani
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.v13i3.9858

Abstract

Pemilihan lokasi merupakan langkah awal untuk penentuan kegiatan perikanan budidaya laut yang berkelanjutan.  Dokumen Rencana Zonasi Wilayah Pesisir dan Pulau-Pulau Kecil (RZWP3K) Provinsi Jawa Timur menyebutkan bahwa kawasan pesisir dan laut yang berada di perairan Selat Madura dan Selat Bali, terutama pesisir Kabupaten Situbondo dan Banyuwangi dialokasikan sebagai wilayah pengembangan budidaya laut. Penelitian ini bertujuan untuk menganalisa karakteristik kondisi perairan Kabupaten Situbondo dan Banyuwangi, khususnya mengenai kelayakan sebagai lokasi budidaya laut. Penelitian ini dilaksanakan pada bulan Juni sampai dengan Juli tahun 2020. Pengambilan data sample air laut dilakukan di  titik pengamatan yang tersebar di 15 kecamatan pesisir di Kabupaten Situbondo (Selat Madura) dan Banyuwangi (Selat Bali dan Samudera Hindia). Metode yang digunakan adalah dengan menganalisis parameter kualitas perairan dan menghitung nilai indeks kesesuaian. Selain itu dilakukan pula pendugaan besarnya beban limbah dan analisis komponen utama. Hasil penelitian dapat disimpulkan bahwa lokasi yang sesuai untuk pengembangan budidaya laut di Kabupaten Situbondo terletak di Kecamatan Suboh, Kendit, Arjasa dan Jangkar dengan nilai indeks kesesuaian berkisar antara 63,5-67,5. Sementara untuk Kabupaten Banyuwangi, kawasan yang sesuai untuk pengembangan budidaya laut terletak di Kecamatan Wongsorejo dan Muncar dengan nilai indeks antara 64 – 68.5. Estimasi beban limbah menunjukkan bahwa potensi limbah yang terjadi akibat budidaya laut dengan KJA adalah sekitar 0,24 ton N/10 unit karamba. Hasil perhitungan analisis komponen utama menunjukkan stasiun pengamatan memiliki karakteristik nilai parameter kualitas air yang beragam.
Densitas dan Morfologi Stomata Daun Pterocarpus indicus di Jalan Arif Rahman Hakim dan Kampus ITS, Surabaya Dhimas Wildan Humami; Puput Anggie Widhiarti Sujono; Iska Desmawati
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.v13i3.7869

Abstract

The relationship between physiological and environmental factors can affect the anatomical structure and morphology of stomata as organs that important to exchange carbon gas, oxygen, and water vapor as well as organs that are directly exposed to polluted environments that can inhibit the photosynthesis process of plant leaves. The purpose of this study was to determine differences in stomata density and morphology of  Pterocarpus indicus leaves at locations suspected of having high pollution exposure and low pollution exposure. This study uses the leaf of Pterocarpus indicus as a type of plant that is often exposed to pollution. The leaf sampling method was carried out with 3 replications in the area of Arif Rahman Hakim Street and Taman Benzena, ITS Surabaya as a comparison of areas estimated to have high and low pollution exposure. Sampling using the abaxial side of the leaf by using the imprint method. Calculation of density is done by unit mm2 of leaf area under normal, closed, and abnormal stomata morphological conditions. The results obtained from the observation of stomata density in Taman ITS Benzena Surabaya are 32,502 stomata/mm2 were opened, 65,004 stomata/mm2 closed, and 13,630 stomata/mm2 abnormal, while in the area of Arif Rahman Hakim Street, Sukolilo, Surabaya as a sample location assuming the pollution is 46,132 stomata/mm2 were opened, 78,634 stomata/mm2 closed and 13,630 stomata/mm2 abnormal.
Rancang Bangun Sistem Pemanen Energi di Lantai Menggunakan Modul BQ25570 pada Aplikasi Piezoelectric Energy Harvesting Rifki Abi Setiawan; Syaiful Alam; Umi Murdika; Sumadi Sumadi
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.v13i3.8926

Abstract

Energy harvesting is a process whereby energy produced is derived from an external. As for external sources consisting of sunlight, sound, the wind, vibrations, the press, and others. One potential that could be used the style press derived from a footrest man while walking. The device that can be used to harvest energy by using the style press is piezoelectric. Piezoelectric is a material when given style tap hence will generate electricity. But, electricity produced piezoelectric is a signal impulse so it needs a coherent rectifier and devices series of electronic another so that the energy harvested can be stored on a battery, in this research using a module BQ25570. Module BQ25570 is an electronic device in which there are DC-DC converter, charging battery and protection, and super capacitor as media temporary storage. The research was conducted by making a prototype with size 80 cm × 50 cm, use piezoelectric kind of PZT as many as 50 strung together in parallel. Testing conducted by using the style press from the average weight of a human body. The results of tests carried out the power produced at the time of heavy 42 kg is 1,345 mW, 52 kg is 2,251 mW, 67 kg is 4,729 mW, 70 kg is 10,646 mW,  and 82 kg is 17,218 mW.
Kesesuaian Jenis Tanaman Pertanian dengan Kualitas Air Irigasi dari Beberapa Mata Air Karst di Kabupaten Tuban Hari Siswoyo; Mohammad Bisri; Mohammad Taufiq; Vanadani Pranantya
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.v13i3.7213

Abstract

This research was conducted with the aim to describe the types of non-paddy agricultural crops that can be cultivated on agricultural land with irrigation water sources from karst springs. This research was conducted at 10 locations of karst springs that are used to irrigate agricultural land in Tuban Regency. Determination of alternative of types of non-rice agricultural crops is done by integrating the irrigation water quality index model, criteria of relative tolerance of crops to salt, and criteria of non-rice agricultural crops that have high economic value. Irrigation water quality index values from karst springs at the study location ranged from 73.99 to 76.23, which is in the range of 70-85 with a low water use restriction. Based on the irrigation water quality index values it can be recommended that water supply for irrigation from karst springs is not carried out on salt sensitive crops. The non-paddy agricultural crop types that can be recommended to be planted in the study location are corn (Zea mays), soybeans (Glycine max), peanuts (Arachis hypogaea), sweet potatoes (Ipomoea batatas), tomatoes (Lycopersicon lycopersicum), eggplants (Solanum melongena), cucumbers (Cucumis sativus), spinach (Spinacia oleracea), melons (Cucumis melo), and watermelons (Citrullus lanatus).

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