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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 18, No 2: Agustus, 2025" : 17 Documents clear
Populasi Sonokeling (Dalbergia latifolia Roxb) di Cagar Alam Gunung Jagat Sumedang Wilujeng, Sri; Fahmi Solihat, Raizal; Darliana, Ina
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.29456

Abstract

Rosewood (Dalbergia latifolia Roxb.) is a tree species with high economic value. The latest data on the global rosewood population was reported in 2020 to be in a vulnerable state of extinction, due to exploitation and regeneration constraints. The initial step in analyzing to restore and manage the existence of a tree species in an area is to observe the population density, population distribution patterns and determine associated plants. The sampling technique was carried out by determining a quadrant of 20 m x 20 m with 37 sampling units. The average density parameters of rosewood per plot were analyzed descriptively, the distribution pattern of rosewood populations was analyzed using the Standardized Morisita Index and the determination of the type of association between rosewood and other species was obtained through the Chi-square Test and Percent Co Occurrence. The results showed that there was a decrease in rosewood density per plot from the seedling level to the tree level. The sharpest decline occurred at the seedling level to the sapling level. The analysis of the rosewood distribution pattern showed a clumped pattern with a Standardized Morisita Index of 0.628. Analysis of rosewood association type, showed that 34 tree species were not associated with rosewood, negatively associated with Orophea hexandra (Blume) and positively associated with Swietenia macrophylla King. Between rosewood and 9 other species has percent Co Occurrence = 0, which shows that there is no interdependence between rosewood and other species. This finding is an important basis for conservation and habitat management efforts, with a focus on the regenerative phase and interspecies relationships to support the sustainability of rosewood populations.
Penampilan 10 Kandidat Jagung Hibrida Berdaya Hasil Tinggi dan Toleran terhadap Kekeringan Ramlan, Ach Rofiqi; Amzeri, Achmad; Chan, Caroline; Suhartono, Suhartono; Umam, Ahmad Syaiful
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.30907

Abstract

One way to increase maize productivity in dry land is to develop superior maize varieties with high production, early maturity, and resistance to drought stress. The study aims to evaluate the characteristics of 10 hybrid maize candidates with high production, early maturity and resistance to drought stress. The research used a Randomized Complete Block Design (RCBD) with 13 genotypes (10 hybrid maize candidates, three comparison varieties (Jakaring, Pioneer-X, and Bisi-X)) as treatments. It was repeated three times, so that there were 39 experimental units. Drought stress using the CYMMYT method, namely drought stress, is carried out when the plants are 50 DAP until harvest, but providing irrigation with field capacity at 0 to 40 DAP with an interval of every 10 days. The observation parameters in this study were plant height, number of leaves, leaf length, leaf area, ear height, days of 50% tasseling, days to 50% silking, harvest age, number of kernel rows, weight of cob with husk, ear length, ear diameter, kernel width, kernel length, kernel thickness, kernel diameter, 1000-kernel weight, and production per hectare. The results of the study showed that the thirteen tested characters showed a very significant effect of the treatment, namely plant height, number of leaves, leaf length, leaf area, ear height, days of 50% tasseling, days to 50% silking, harvest age, number of kernel rows, weight of cob with husk, ear length, kernel width, and 1000-kernel weight. Four characters showed a significant effect of treatment: kernel length, kernel thickness, kernel diameter, and production per hectare. The ear diameter character did not show any significant differences between treatments. The broad heritability values for all tested characters for the 13 genotypes ranged from 49.90 to 97.90. Production per hectare was positively correlated with ear length (0.79**), ear diameter (0.37*), and kernel thickness (0.59**). Furthermore, the production character per hectare is negatively correlated with harvest age (-0.49**) and kernel length (-0.38*). G1, G2, G3, and G6 are the hybrid maize candidates selected for the release of hybrid varieties with high production and early maturity.
Sintesis Biodiesel dari Minyak Jelantah menggunakan Katalis Heterogen Berbasis Kalsium Oksida dari Limbah Cangkang Kerang Bulu (Anadara antiquata) Rahmat, Anni; Kurniati, Yuni; Rahmah Hidayah, Laila; Nafisah, Salwa
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.30015

Abstract

The depletion of non-renewable fossil energy reserves is the main reason for this research to develop renewable energy as a substitute for diesel fuel. One of the alternatives studied is the production of biodiesel from used cooking oil. This study aims to produce environmentally friendly biodiesel, reduce dependence on fossil energy, and utilize used cooking oil waste to increase its value for society. This research employs esterification and transesterification methods. The variations in the catalyst used are 2 grams, 4 grams, and 6 grams. Meanwhile, the oil-to-methanol ratio is applied at 1:1.5, 1:3, and 1:6. The results of this study indicate that the free fatty acid content of used cooking oil must be at least 1% to proceed with the transesterification process. Calcium oxide (CaO) catalyst derived from Anadara antiquata shell waste, used as a heterogeneous base catalyst, contains 96.51% CaO. The best biodiesel yield was obtained at a molar ratio of 1:1.5 with 6 grams of catalyst, a molar ratio of 1:6 with 2 grams of catalyst, and a molar ratio of 1:6 with 4 grams of catalyst. All three samples met the biodiesel test standards according to the National Standard (SNI. This study tested the flame on biodiesel. During combustion, the flame color is produced by rapid oxidation. The color indicates the amount of energy produced. Blue flames emit more heat than red flames. Red flames are present below 1000°C. Blue flames are present at temperatures below 2000°C. The combustion of samples containing biodiesel produced a blue flame.
Pengaruh Penambahan Konsentrasi Minyak Atsiri Nilam (Pogostemon cablin B.) Pada Formulasi Pembuatan Sampo Cair Widyasanti, Asri; Hafyyan, Muhammad; Rosalinda, S
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.27951

Abstract

Shampoo is a personal care product formulated to cleanse and maintain the health of hair and scalp by removing impurities. Indonesia has significant potential to capture a share of the global shampoo market by leveraging its natural resources and traditional herbal ingredients. Patchouli essential oil, a notable ingredient in Indonesian products, contains patchouli alcohol, which serves as an effective antibacterial agent. This study aimed to examine the impact of incorporating light fraction patchouli oil into a liquid shampoo formulation and to evaluate the quality of the patchouli oil shampoo in accordance with the Indonesian National Standard (SNI) Shampoo 06-2692-1992. The research employed a laboratory-based experimental approach using a Completely Randomized Design (CRD). Treatments involved varying concentrations of patchouli oil added to the shampoo formulation: Z (0%), A (1.0%) (w/w), B (1.25%) (w/w), C (1.5%) (w/w), D (1.75%) (w/w), and E (2.0%) (w/w). The evaluation parameters included yield, moisture content, pH level, organoleptic properties, and antibacterial activity. Among the formulations, the shampoo with a 1.0% (w/w) concentration of patchouli oil (Treatment A) was identified as the optimal formula, with a yield of 87.122%, moisture content of 63.59%, pH of 6.74, and the highest bacterial inhibition zone at 16.75 mm. Results indicated that increasing the concentration of patchouli oil resulted in higher moisture content and pH levels, while yield and antibacterial activity decreased. All treatments met the standards set by SNI Shampoo 06-2692-1992, demonstrating that the addition of light fraction patchouli oil is effective and beneficial as a functional component in shampoo production.
Perancangan Alat Pembaca Aksara Jawa Pada Prasasti Dengan Metode YOLO Ubaidillah, Achmad; Fiqhi Ibadillah, Achmad; Lailatul Riski, Ulfa; Fajar Sidik, Rahmad; Kholida, S. Ida
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.28173

Abstract

Understanding the history of a nation is very important. Inscriptions are an important historical relic for the nation. Inscriptions provide information and learning for future generations. Inscriptions are usually made of stone or metal. There are several problems in reading the inscription, such as smearing which affects the readability of the writing, erosion of the smear or other things which reduce the legibility of the inscription. On the other hand, Javanese script is a way of writing Javanese instead of using Latin script. It is quite difficult to understand and memorize Javanese script because of its shape and rarely used. Archaeologists in Indonesia generally use fairly simple tools to read inscriptions so it takes a long time. This adds complexity to the process of documenting existing inscriptions. Therefore, in this research a tool was designed to read and translate inscriptions using the principle of light reflection. This is the main contribution and novelty of this research. The data that has been obtained is then processed using image processing and interpreted from Javanese to Indonesian. The method used is YOLO (You Only Look Once) to process image processing. Adding light around the inscription using LED strip lights. From the experiment, the success rate was 88.5% and the failure rate was 11.5%. The intensity of the light and the accuracy of the angle of incidence of the light greatly influence the level of success in reading the writing on the inscription.
Effect of Boiler Chimney Design on Particulate Emission Dispersion Using Aermod Modelling Prabasari, Ira Galih; Hutagalung, Winny Laura Christina; Bahar, Fetty Febriasti; Kumalasari, Dyah
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.28630

Abstract

In the power plants operation, the combustion process will produce particulate emissions. Particulate emissions themselves are known have a negative impact on health, such as causing respiratory problems. The pattern of particulate emissions from boiler chimneys needs to be studied to minimize the spread of pollution to the environment. The particulate emission dispersion model generated from the chimney of a boiler can be known using the aermod modeling tool, through this model, the concentration of particulate emissions received by the environment around the activity can be studied. The design of the boiler chimney is also known to affect the concentration of particulate matter that is dispersed. This study aims to determine the effect of chimney design on the distribution of particulate emissions from boilers. The particulate dispersion model was carried out using the aermod modeling tool with the independent variables were variations in chimney heights of 21 meters and 25 meters. From the dispersion analysis, it can be seen that the 21-meter chimney results in higher emission concentrations at close range because the lower chimney causes less optimal dispersion and tends to have a more significant local impact due to higher emission concentrations near the source. The 25-meter chimney provides better dispersion results more effective in dispersing pollutants over a wider area. The result of this research is consistent with plume rise theory and the Gaussian dispersion model, which states that the higher the stack, the more potential for the released flue gas and particulates to disperse vertically and horizontally before reaching ground level. Taller chimneys allow emissions to be released at a higher altitude, which can reduce particulate concentrations in the area around the plant or industrial installation. As the stack height increases, emissions are dispersed more widely in the atmosphere, so the potential for pollutant accumulation in areas near the source is reduced
Optimalisasi Teknologi Fog Harvesting: Studi Performa Fog Collector Model Savonius dan Datar Jamaldi, Agus; Supriyanto, Agung; Prihastomo, Arik; Davantio, Jeremy Adi
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.28510

Abstract

Fog harvesting or fog catching is a technological breakthrough used as a sustainable and environmentally friendly water source. This technology utilizes mist converted into water droplets captured by the fog collector. This study was conducted to analyze the effectiveness of the number and shape of fog collectors in a fog harvesting prototype. The shape of the fog collector used is flat and semicircular (savonius). The variation in the number of fog collectors used is 2, 4, and 6 pieces. The fog collector material is High-Density Polyethylene (HDPE) with Rectangular and Raschel mesh. The area of flat and semicircular fog collectors (Savonius) is 209.25 and 310.5 cm2, with a shading coefficient of 60%, respectively. The data collection method is carried out by blowing the mist generated by the ultrasonic mist maker to the fog collector using a blower for 1 hour. The water mass amount that can be absorbed by the fog collector is obtained by weighing it every 15 minutes. The results showed that the more fog collectors, the more water mass was produced. The difference in the type of fog collector mesh also affects the amount of water mass produced. The semicircular type (Savonius) produces more water mass from fog than the flat type. The experiment results showed that the semicircular type (Savonius) with 6 fog collectors with the Raschel mesh type produced the most water mass of 6.27 grams. Based on the results, the semicircular fog collector (Savonius) with the Raschel mesh type is more effective than the flat type.
Identifikasi Tanaman Melon Toleran Cekaman Kekeringan Umam, Ahmad Syaiful; Amzeri, Achmad; Husna, Arifah
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.31405

Abstract

Identifikasi tanaman melon yang tahan terhadap cekaman kekeringan merupakan solusi untuk meningkatkan produktivitas tanaman melon pada lahan kering. Tujuan penelitian adalah identifikasi karakter-karakter melon dan menyeleksi toleransi melon terhadap cekaman kekeringan. Penelitian menggunakan Rancangan Acak Kelompok  faktorial yang terdiri dari 2 faktor.  Faktor pertama terdiri dari 10 taraf genotip tanaman melon dan faktor kedua terdiri dari 2 taraf, yaitu Irigasi 100% (100% kapasitas lapang) dan irigasi 50% (50% kapasitas lapang). Penelitian terdiri dari 20 kombinasi perlakuan dan diulang sebanyak 3 ulangan sehingga dihasilkan 60 unit percobaan. Tiap unit percobaan terdiri dari 5 tanaman dan pengamatan dilakukan pada 3 tanaman sampel pada setiap unit percobaan. Karakter tanaman yang diamati adalah umur berbunga jantan, umur berbunga betina, umur panen, kadar gula (oBrix), bentuk buah, warna kulit buah, warna buah, net pada kulit buah, panjang buah, diameter buah, tebal daging buah, berat buah, dan produksi per hektar. Hasil penelitian menunjukkan bahwa cekaman kekeringan menurunkan produksi per hektar sebesar 26.36%. Nilai ISK rata-rata menunjukkan bahwa terdapat 3 genotip yang toleran terhadap cekaman kekeringan dan 7 genotip yang tidak tahan terhadap cekaman kekeringan. Tanaman melon yang direkomendasikan untuk dikembangkan pada lahan kering adalah G2, G3, G5, dan G6.
Produksi Blok Plastik Bahan Pasangan Dinding dari Kombinasi Plastik Tipis Bekas Kemasan dan Minyak Jelantah Tanpa dan Dengan Pengisi Abu Sekam Thanaya, I Nyoman Arya; Mataram, I Nyoman Karnata; Ian Anu, Dafry
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.29371

Abstract

Waste thin plastic wrap in the form of crackle plastic, aluminium coated plastic, other thin plastics, have not yet been widely utilized. Limited un-organic rubish collector willing to receive it. The price is also relatively low, hence it is not attractive for it’s collection. This material can be used as a plastic wall block (PWB) with combination of those waste plastic, waste cooking oil (wco), without and with rice husk ash filling. The objective was to analyze the properties of the PWB. There were four mixed produced namely: Mix A (50% crackle plastic+25% aluminium coated plastic+25% other thin plastics and wco); Mix B: (75% crackle plastic+12.5% aluminium coated plastic+12.5% other thin plastics and wco). Mix C: similar to Mix A, added with rice husk ash. Mix D, similar to mix B, added with rice husk filling. The samples were produced by heating the wco at 200 °C, the the waste plastic were melted without and wirh rice husk ash, then pressed at around 576.02 kg. The mixture were pressed at 100-125 °C. It was obtained that the density: 0.796 – 0.817gr/cm3, porosity: 0.018 – 0.096, IRS: 0.015 – 0.045 kg/cm2.minute, absorption: 0.044– 0.169%. The unsoaked compressive strength was 14.51 – 27.285  kg/cm2. The soaked one was 13.005 – 23.205. In general the compressive strength obtained was within higher range of low quality block experimented by researchers in some part of the world with sttength between 2.55-15.2 kg/cm2.
Penerapan Sistem Kontrol Adaptif Proportional Integral Derivative (PID) pada Mesin Penimbang Mie dengan Konveyor Dafid, Ach; Umam, Faikul; Budiarto, Hairil
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.31610

Abstract

Indonesia is the second-largest instant noodle consumer in the world after China, with consumption reaching more than 12 billion packs per year. This high demand drives the need for innovation in the production process, especially in the weighing and cutting aspects, which are still carried out manually in small and medium industries. Manual processes not only require more time and energy, but also result in variations in packaging weight that are not uniform and reduce production efficiency. This study aims to design and implement a Proportional Integral Derivative (PID) adaptive control system on a noodle weighing machine with a conveyor. The system was developed using a load cell sensor to measure the noodle dough weight, a servo motor as a cutting actuator, and a DC motor as a conveyor drive, all of which are controlled by an Arduino ATmega 2560 microcontroller. The research methodology includes mechanical design, electronic design, control system programming, sensor calibration, and performance testing. The test results show that the system is able to produce noodle portions with a target weight of 50 grams consistently. The prototype has conveyor dimensions of 100×20×8 cm with a speed of 26 cm/ms, controlled using tuned PID parameters (Kp=1.5; Ki=1; Kd=1.7). From 20 trials, the system produced an average error of 0.75% and a success rate of 99.25%. Thus, the application of the PID adaptive control system has been proven to improve weighing precision, conveyor speed stability, and production efficiency. This innovation is expected to be a simple and affordable solution to support the automation of small and medium industries in Indonesia in facing increasingly fierce food market competition.

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