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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 10 Documents
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Search results for , issue "Vol 18, No 1: April 2025" : 10 Documents clear
Analysis of Slip Plane Using Geoelectric Data in Pancor Dao Central Lombok Ulfah, Syarifatul; Winardi, Agus
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.26538

Abstract

Landslide are one of the disasters that occur in sloping areas. It occurs very often when the intensity of rainfall is high. Apart from that, it occurs in an area known as a slip area. The slip area is characterized by contrasting rock resistivity values. This research aims to determine the resistivity value of the soil indicated as a sliding area using the geoelectric method with a dipole-dipole configuration. A dipole-dipole configuration is used to get a deeper penetration value compared to other configurations. Field data collection was carried out on 3 tracks with a research area of around 1,000 m2. Based on the results of data processing using 2D Res2divn inversion, the soil resistivity value is obtained which is indicated as a slip plane. The soil resistivity value indicated as a slip plane on 3 line, namely resistivity value on line 1 of 973 Ωm - 2067 Ωm, line 2 of 1202 Ωm - 3167 Ωm, line 3 of 618 Ωm – 1391 Ωm which is classified as a type of silt clay soil. the results show that the depth of slip plane on the third line is deeper than the first line and second line. From the soil resistivity values, it represents the slip plane. And the depth of slip plane on 3 line, namely at a depth of 8.53 m - 12.7 m for the first line, 5.13 - 16.3 m for the second line, and 1.71 - 17 m for the third line. And categorized as shallow to deep slip plane types.
Pengaruh Variasi Holding Time pada Proses Single Stage Aging Terhadap Kekerasan dan Mikrostruktur pada Material Paduan Al-Si-Cu-Fe Shieddieque, Apang Djafar; Kuswandi, Rendi
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.26678

Abstract

The Al-Si-Cu aluminum alloy is the most commonly used alloy for household appliances, aircraft materials, automotive, marine vessels, construction, and more. However, cast aluminum alloys still exhibit low mechanical properties, necessitating additional processes to enhance their strength. One method of strengthening aluminum is by varying the composition and/or heat treatment process. The aim of this research is to investigate the effect of aging time variation on the microstructure and hardness of the Al-Si-Cu-Fe alloy. The heat treatment processes conducted in this study include solid solution treatment (T=540°C and t=5 hours) and various single-stage aging treatments (T=155°C and t=4, 5, and 6 hours). Mechanical properties of the aluminum alloy were evaluated through metallographic observations and Brinell hardness testing. Microstructural observations indicate changes in the Silicon microstructure from the As cast sample, which exhibits dendrites, to the formation of AlSi and AlFeSi phases after aging treatment. With longer aging treatments, larger and more dispersed precipitate grains are formed. The variation in holding time has different effects on hardness, with the highest hardness obtained at a holding time of 4 hours during artificial aging, resulting in 71.57 BHN. However, increasing the holding time tends to decrease hardness due to the growth of larger precipitate phases.
Analisis Pengaruh Penambahan Koagulan Terhadap Kualitas Tetes Tebu dalam Proses Dekalsifikasi sebagai Bahan Baku Pembuatan Monosodium Glutamate Shofia Khoirunissa, Dita; Ramadhani, Salsabila Amania; Darmayanti, Rizki Fitria; Muharja, Maktum; Khotimah, Husnul; Ayu Salsabila, Putri
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.22196

Abstract

One of the challenges in preparing MSG raw materials is the reduction in the quality of molasses due to changes in the sugar production process. This research aims to evaluate the impact of adding coagulants on improving the quality of molasses in the Industrial MSG preparation. The materials used consist of sugar cane molasses and Sodium polyacrylate with varying concentrations of 5-20 ppm. Analysis was carried out on the percentage of total solids (%TS) using the sludge reduction rate method, and by comparing the total solution volume with the sludge height. The results showed that the addition of coagulant had a significant effect on the rate of sludge formation. The optimum point was achieved by adding 20 ppm of coagulant, which was able to achieve sludge reduction stability within 0.5 hours. Optimal operational conditions occur at a temperature of 55℃, pH 2.5-2.6, and a sugar content of 37%. The important role of the coagulant solution volume was seen in accelerating the deposition process, which had a significant impact (P 0.1). Although this condition has the potential to accelerate improvements in the quality of molasses in the production process, it still requires an assessment of the economic impact on overall production profits. The addition of coagulants was identified as a solution to improve the quality of molasses which was decreasing.
Smart Camera for Volcano Eruption Early Warning System Based on Faster R-CNN and YOLO Firdausi, Hasanur Mohammad; Utomo, Satryo Budi; Widjonarko, Widjonarko
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.27372

Abstract

This research uses two object detection algorithms, Faster R-CNN with ResNet50 backbone and YOLOv5, to develop an intelligent camera system for monitoring volcanic activities. The models were trained and evaluated using CCTV footage from Mount Semeru, a region prone to volcanic eruptions. Key performance metrics such as Precision, Recall, and mean Average Precision (mAP) were used to evaluate the performance of both models. The high precision numbers for YOLOv5 and Faster R-CNN show they are good at avoiding false positives, which is essential for volcanic monitoring. YOLOv5 has a precision of 83.2%, while Faster R-CNN is 84%. However, recall shows a more significant difference between the two models. Faster R-CNN has a recall of 82%, meaning it is better at detecting all relevant volcanic activities, even if that means catching a few false positives. The variations in performance can be attributed to their respective designs. YOLOv5 is designed to achieve rapid, real-time detection by simultaneously predicting bounding boxes and class probabilities. This approach enhances speed but may slightly reduce recall.  Faster R-CNN uses a two-stage process, tending to be more accurate but can be slower and less flexible across different IoU thresholds. Its higher recall means it catches more objects, contributing to its lower mAP@50-95 since it could struggle with overlapping or varying-sized objects.
Efektivitas Media Filter Pasir Silika dan Arang Ampas Tebu untuk Menurunkan Warna Menggunakan Filtrasi Upflow Farras Fadillah, Raihan; Badriani, Ririn Endah; Fildzah, Cantika Almas
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.24483

Abstract

The availability of quality water is crucial for human survival. This study aims to evaluate the efficiency of reducing water colour through the upflow filtration method with variations in silica sand filter media and bagasse charcoal. The research method involves the preparation of research tools and materials, the manufacture of bagasse charcoal, and filter reactors. Experimental stages include raw water preparation and testing, the filtration process, filtration result water collection and testing, and data analysis. The results showed that the colour removal efficiency at 16.72 TCU was highest in reactor 2 (77.07%) and lowest in reactor 3 (45.85%). At 34.28 TCU, the highest efficiency was in reactor 2 (63.24%) and the lowest in reactor 3 (29.09%). The level of 46.08 TCU showed the highest efficiency in reactor 2 (59.33%) and the lowest in reactor 3 (22.53%). Two Ways ANOVA analysis showed that the thickness of bagasse charcoal filter media has a significant effect on colour reduction because the p value is smaller than 0.05. While the thickness of silica sand has no significant effect because the p value is greater than 0.05, The limitation of colour removal is due to the small surface area of silica sand, which cannot absorb a limited amount of dye.
Pengaruh Hutan Mangrove Terhadap Reduksi Gelombang di Pantai Bama Kabupaten Situbondo dengan Pemodelan Menggunakan Delft3D Imanda, Regita Ramadhani; Wiyono, Retno Utami Agung; Widiarti, Wiwik Yunarni
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.26555

Abstract

Mangrove forest in Bama Beach is one of the mangrove forests in Indonesia. Mangroves in the Bama Beach area have a function to protect various ecosystems around it from damage due to abrasion or sedimentation. Bama Beach, whose status is still in the Baluran National Park area and a tourist spot that has a beautiful charm, needs to be protected from wave damage so that wave reduction modeling research is carried out on the influence of mangrove forest width using Delft3D software. Modeling was carried out to obtain the value of energy reduction and wave height due to the presence of mangrove forests with different widths. The modeling results found that the highest significant wave height occurred on July 16, 2023 at 12:00 WIB. Mangrove forests with a thickness of 125 m can reduce wave height by 30.031% and wave energy by 48.263%. Mangrove forests with a thickness of 110 m can reduce up to 15.988% of wave height and 31.268% of wave energy. Mangroves with a thickness of 37 m can reduce up to 4.049% of wave height and 10.940% of wave energy.
Perencanaan Sistem Pengelolaan Sampah Skala Desa di Kecamatan Mukok Kabupaten Sanggau Sugeng, Try Kurniadi; Jumiati, Jumiati; Desmaiani, Herda
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.24582

Abstract

Population growth in Mukok District, Sanggau Regency, and West Kalimantan Province has resulted in the expansion of residential areas that are difficult to access by local government waste disposal facilities. The enormous volume of waste is the result of the community's lack of understanding of the significance of appropriate waste management and disposal. Burning rubbish is a common sanitary practice. The purpose of this research is to investigate the current waste management system in Mukok District, estimate the expected waste volume till 2032, and build an effective waste management system for Mukok District. The collection and measurement of waste samples adhere to the SNI 19-3694-1994 criteria. Inggis, Semuntai, and Kedukul villages generate 2.66 m3/day, 9 m3/day, and 3.05 m3/day of rubbish, respectively. The waste management plan calls for isolating organic and inorganic trash at the source, using individual containers for each residence, and collecting trash on a daily basis with three-wheeled bike.
Penentuan Strategi Pengelolaan Sampah Rumah Tangga dengan Metode SWOT (Studi Kasus: Bangunjiwo Kasihan Bantul DIY) Astuti, Reni Dwi; Maknun, Lu’luil
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.28033

Abstract

Waste is one of the problems in Bantul Regency, especially in Bangunjiwo Village, Kasihan District. Bangunjiwo Village has a waste generation of 8.39 tonnes per day, but only 0.03 tonnes can be managed, and the rest is disposed of in landfills. The contributing factors are low public awareness of waste management and suboptimal waste management. The purpose of this study is to propose a waste management strategy to reduce the volume of waste disposed to landfill. This research uses the SWOT method as a strategy planning tool by considering the internal factors of the waste management party and the external factors that surround it. Strategy determination is based on the calculation of the IFAS and EFAS matrix which serves to determine the quadrant position. Then the quadrant position is used as the basis for determining waste management strategies. The results showed that the position of waste management in Bangunjiwo Village is in quadrant 1 (S-O), which means that it must optimise internal strengths and existing opportunities. The strategy formed is a strategy of collaboration between BUMDes and private waste collectors by utilising funds provided by the Regency Government and utilising the existing large land area, as well as increasing the empowerment of Human Resources (HR) for waste management. 
Modeling of conventional single slope solar still (CS4) with phase change material (PCM) Santosa, Irfan; Dwi Septiyanto, Muhamad; Andriyanto, Sholikhin; Budiana, Eko Prasetya Budiana; Hadi, Syamsul; Wijayanta, Agung Tri
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.29386

Abstract

This study investigates the capability of two-dimensional Computational Fluid Dynamics (CFD) simulation to estimate the temperature distribution pattern and velocity contours in a single slope solar still that uses soybean wax as a phase change material (PCM). A triangular mesh model is employed in the simulation. The basin geometry uses a mesh with 20,402 nodes and 10,000 elements, while the PCM geometry uses a mesh consisting of 9,272 nodes and 4,500 elements. This study introduces an equation developed based on the Dunkle, Bulk Motion, and Chilton-Colburn analogies to estimate the Nusselt number in the solar still. The water temperature (Tw), the inner surface temperature of the glass cover (Tg), and the PCM temperature (Tpcm) are determined experimentally, whereas the performance of the conventional solar distillation system is predicted theoretically using the experimental results. The results demonstrate that the use of soybean wax as a PCM positively influences the temperature distribution and streamline patterns within the single slope solar still. In the morning, the temperature and velocity distributions reveal that the isotherm lines are parallel to the lower right segment of the cavity, indicating that conduction is the dominant heat transfer mechanism. As the day progresses, the streamline pattern inside the cavity expands and becomes more curved, suggesting an increased influence of the convection process. These findings are consistent with the CFD analysis results, which show high accuracy in predicting Nusselt numbers. Furthermore, the comparison between daily distilled water productivity from experimental measurements and theoretical predictions shows good agreement.
Seleksi Galur Jagung Tahan terhadap Cekaman Kekeringan Menggunakan PEG 6000 pada Fase Perkecambahan Ahadiyah, Izdihar Suci; Suhartono, Suhartono; Amzeri, Achmad; Umam, Ahmad Syaiful
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.30395

Abstract

Seleksi galur jagung terhadap cekaman kekeringan merupakan langkah awal untuk merakit varietas jagung dengan karakter produksi tinggi dan tahan terhadap cekaman kekeringan.  Penelitian bertujuan untuk mengetahui karakter galur jagung pada fase perkecambahan dan menseleksi ketahanan galur jagung pada fase perkecambahan menggunakan PEG 6000. Penelitian menggunakan Rancangan Acak Lengkap yang disusun secara faktorial dengan dua faktor. Faktor pertama adalah 20 galur jagung dan faktor kedua adalah kosentrasi PEG 6000 yaitu 0% (Potensial osmotik : 0 Mpa), 5 % (potensial osmotik -0,03 Mpa), 10 % (potensial osmotik : -0,19 Mpa), 15% (potensial osmotik : -0.41 Mpa), dan 20% (potensial osmotik : -0,67 Mpa). Karakter yang diamati adalah daya berkecambah, panjang akar dan tunas, berat basah kecambah, berat kering kecambah, dan Indeks Sensitivitas Kekeringan (ISK). Hasil penelitian menunjukkan bahwa perlakuan pemberian larutan PEG 6000 sebesar 5%, 10%, 15%, dan 20% sebagian besar menurunkan nilai karakter daya kecambah, panjang akar dan tunas, berat basah kecambah, dan berat kering kecambah dibandingkan dengan kontrol (pemberian larutan PEG sebesar 0%).  Perlakuan pemberian larutan PEG 6000 pada kosentrasi 0%, 5%, 10%, 15%, dan 20% pada semua karakter terdapat perbedaan nyata pada 20 galur yang diuji kecuali untuk karakter berat kering kecambah pada perlakuan pemberian PEG 6000 sebesar 15%. Galur jagung yang toleran terhadap cekaman kekeringan adalah G1, G2, G3, G8, G9, G13, dan G20.

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