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All Journal International Journal of Advances in Applied Sciences Media Teknik Sipil Jurnal Dedikasi Jurnal Gamma Prosiding Semnastek Journal of Energy, Mechanical, Material and Manufacturing Engineering BERDIKARI : Jurnal Inovasi dan Penerapan Ipteks PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat J-Dinamika: Jurnal Pengabdian Kepada Masyarakat JINAV: Journal of Information and Visualization ARMATUR : Artikel Teknik Mesin dan Manufaktur Jurnal Teknik Mesin Sinergi SENTRI: Jurnal Riset Ilmiah J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin
Ali Mokhtar
Universitas Muhammadiyah Malang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences

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Pengaruh Penambahan Catalytic Converter Berbahan Ceramic Cordierite Honeycomb dan Sponge steel terhadap Emisi Gas Buang Kendaraan Rahmandhika, Andinusa; Mokhtar, Ali; Defantyan, Etantyo Daffa; Lutfi, Vicky Thorikhotul
J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Vol. 8 No. 2 (2024): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v8i2.1429

Abstract

Peningkatan jumlah kendaraan bermotor mengakibatkan kenaikan polusi udara akibat emisi gas buang. Penelitian ini bertujuan untuk mengkaji penambahan katalisator berbahan keramik cordierite berbentuk sarang lebah dan penambahan spons baja guna menghambat tingginya gas berbahaya yang dilepaskan pada knalpot. Metode yang digunakan dalam penelitian ini adalah metode eksperimental, dimulai dari perancangan converter, pemilihan jenis katalis, hingga proses pembuatan converter berbahan keramik cordierite dan spons baja lebah. Selanjutnya, dilakukan pengujian untuk membandingkan emisi gas buang kendaraan yang menggunakan converter dengan yang tidak menggunakan atau menggunakan knalpot bawaan motor. Parameter yang diukur adalah presentase gas buang CO, CO2, dan HC pada knalpot dengan memvariasikan nilai putaran mesin. Hasil pengujian menunjukkan bahwa penggunaan converter berbahan katalis keramik cordierite dapat menekan peningkatan presentase gas CO, CO2, dan kadar emisi HC yang dilepaskan ke lingkungan pada putaran mesin 1500 – 4500 rpm. Penambahan sponge steel efektif untuk mereduksi gas CO, CO2, dan kadar emisi HC pada putaran mesin rendah, namun tidak maksimal pada rpm tinggi.
Prediction index drought use neural network based rainfall Nafiiyah, Nur; Mokhtar, Ali
International Journal of Advances in Applied Sciences Vol 14, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v14.i4.pp1146-1154

Abstract

Prolonged dry seasons compared to rainy seasons often lead to drought, making drought index observations essential. In Indonesia, drought monitoring commonly uses the standardized precipitation index (SPI), yet there is no common standard for drought index measurement. Therefore, this research applies the Z-score index (ZSI) and China-Z index (CZI), which, like SPI, are rainfall-based drought indices but have rarely been explored in previous research. To predict ZSI and CZI, this research compares the weighted moving average (WMA) and multilayer perceptron (MLP) methods. Two input scenarios are tested: the previous two periods (t-2, t-1) and the previous three periods (t-3, t-2, t-1). The results show that MLP outperforms WMA, with the best performance achieved by the MLP model at a mean absolute percentage error (MAPE) of 4.177% using the three variable input scenario and MLP architecture 3-6-10-1.
Implementasi Prinsip Kerja Generator pada Alat Peraga Program Eduwisata di Pos Konservasi Energi Taman Rekreasi Sengkaling Universitas Muhammadiyah Malang: Implementation of the Generator Working Principle in the Props of the Eduwisata Program of Taman Rekreasi Sengkaling Universitas Muhammadiyah Malang in Energy Conservation Station Rahmandhika, Andinusa; Mokhtar, Ali; Astuti, Ary Dwi; Zakaria, Arie
PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 11 No. 4 (2026): PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institute for Research and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/pengabdianmu.v11i4.11604

Abstract

Taman Rekreasi Sengkaling (TRS) is a business unit owned and managed by Universitas Muhammadiyah Malang (UMM). It provides entertainment and educational (eduwisata) facilities for visitors. Students' use of the props in the Energy Conservation Station TRS UMM prompted the need for repair and maintenance. Therefore, some of the materials that need props cannot be practiced. Moreover, knowledge on energy has been developed that TRS UMM requires another prop for the eduwisata program in Energy Post. Therefore, the problem faced by TRS UMM, especially in Energy Post, is the need for additional props to serve as facilities for the eduwisata program for visitors. The solution offered to this problem is to provide this facility with props for the Energy Conservation Station TRS UMM. The props were designed to develop energy knowledge, especially for students' learning, as they aim to help students apply and practice the concepts they learned at school. The design of the props began with building the design and defining the working principle. It was tested before it was applied at Energy Post TRS UMM.
Analysis of a friction buffer stop as an enhancement of safety systems on railway testing tracks Andinusa Rahmandhika; Muhammad Choirul Insan; Budiono Budiono; Ali Mokhtar; Karisma Rizal
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 11 No. 1 (2026)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.44701

Abstract

The use of safety equipment in the railway sector is crucial, particularly when navigation system failures occur. One such aid used when a train fails to stop is the buffer stop. Friction buffer stops are a type of buffer stop that can absorb large amounts of kinetic energy, enabling efficient and safe deceleration. Although it has been widely implemented in railway systems, few studies have evaluated its energy absorption capability and deceleration characteristics specifically on railway test tracks. This study aims to evaluate the absorption of kinetic energy by the buffer stop during train collisions and ensure the deceleration rate meets the standard of ≤ 2.5 m/s². This study used an analytical calculation method based on friction buffer stop design equations, ISO 898-1 bolt standards, and kinetic energy-deceleration analysis. The results of the study show the relationship between kinetic energy, deceleration rate, and braking distance, as well as the influence of bolt size and material grade on the friction force in the braking jaws. The deceleration rate meets the requirements; the braking distance is ≤ 11 meters, and the kinetic energy is well absorbed by the buffer stops.
Perencanaan Bangunan Pengaman Pantai untuk Mitigasi Abrasi dan Perlindungan Kawasan Wisata Pulau Derawan Kabupaten Berau Muhammad Nizar; Ali Mokhtar
SENTRI: Jurnal Riset Ilmiah Vol. 5 No. 9 (2026): SENTRI : Jurnal Riset Ilmiah, September 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v5i9.7079

Abstract

Derawan Island is one of the leading tourism destinations in Berau Regency that is vulnerable to coastal erosion, particularly along the eastern to northeastern parts of the island. Continuous coastal erosion poses a significant threat to tourism areas, local settlements, and coastal infrastructure located along the shoreline. This study aims to analyze the coastal erosion conditions and determine the most appropriate coastal protection structure as a mitigation measure to reduce erosion and protect the tourism area of Derawan Island. The research employed shoreline change analysis using the Digital Shoreline Analysis System (DSAS), hydro-oceanographic condition analysis, coastal erosion vulnerability and risk assessment, and evaluation of alternative coastal protection structures based on technical and environmental criteria. The results indicate that the eastern to northeastern coast of Derawan Island has experienced coastal erosion covering approximately 1.4 ha, with a shoreline change rate of -1.71 m/year. Hydro-oceanographic analysis shows that waves and ocean currents play a significant role in sediment transport processes, thereby influencing shoreline dynamics. Based on the evaluation of alternative coastal protection structures, an offshore breakwater was identified as the most suitable option due to its superior ability to reduce wave energy, control coastal erosion, and accommodate environmental considerations while maintaining tourism activities. The proposed coastal protection concept consists of a series of offshore breakwaters connected by a causeway, strategically located in areas experiencing the most severe erosion. The findings of this study are expected to provide a scientific basis for coastal protection planning and contribute to the sustainable management of the coastal tourism area of Derawan Island.
Perancangan Teknis Struktur Perkerasan Jalan dalam Mendukung Rekonstruksi Infrastruktur Transportasi di Kecamatan Pulau Derawan (Studi Komparatif Desain Perkerasan Kaku dan Perkerasan Lentur) Suyatno Suyatno; Ali Mokhtar
SENTRI: Jurnal Riset Ilmiah Vol. 5 No. 9 (2026): SENTRI : Jurnal Riset Ilmiah, September 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v5i9.7082

Abstract

Derawan Island District is an archipelagic area with continuously developing marine tourism potential; however, its road infrastructure faces technical challenges due to coastal subgrade characteristics, water inundation, and increasing tourism-related traffic loads. This study aims to design an appropriate pavement structure to support road reconstruction in the area by comparing two design alternatives, namely flexible pavement and rigid pavement. The method employed includes a review of secondary data consisting of soil characteristics, traffic volume, and climatic conditions, which were subsequently analyzed using the Indonesian Highway Design Manual (Bina Marga) pavement thickness design guidelines and the AASHTO 1993 design references. The results indicate that rigid pavement is technically more suitable for road sections with low soil bearing capacity and high inundation risks, while flexible pavement remains applicable for segments with more stable soil conditions and faster construction requirements. This study is expected to serve as an initial technical reference for planners and stakeholders in determining effective, durable, and geographically appropriate road reconstruction strategies for small archipelagic regions.
Analisis Dampak Lingkungan Pembangunan Spam Biatan Lempake dalam Peningkatan Pelayanan Air Bersih di Kabupaten Berau Fadhil Adzanino Prayogo; Ali Mokhtar
SENTRI: Jurnal Riset Ilmiah Vol. 5 No. 9 (2026): SENTRI : Jurnal Riset Ilmiah, September 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v5i9.7112

Abstract

Access to safe and sustainable drinking water is both a basic community need and an engineering challenge in areas with limited accessibility such as Biatan Sub-district, Berau Regency, East Kalimantan. This article reviews the Environmental Management and Monitoring Effort (UKL-UPL) document for the planned Biatan Lempake Drinking Water Supply System (SPAM), designed with an 80 liter/second intake capacity, two reservoirs with a combined capacity of 2,000 m³, and a distribution network serving approximately 5,000 household connections across five villages. The study applies a descriptive-analytical method to the technical and environmental planning documents, covering baseline environmental conditions, impact scoping across the pre-construction, construction, operational, and post-operational stages, and an assessment of the proposed environmental management and monitoring measures. Key identified impacts include reduced air quality and increased noise from heavy-equipment mobilization, potential degradation of Biatan River surface-water quality as the raw-water source, increased solid domestic and hazardous waste during operation, and shifts in community perception and socio-economic conditions. From an engineering standpoint, the SPAM Biatan Lempake design incorporates environmental engineering principles through the sequential layout of intake, treatment, and reservoir units for hydraulic efficiency, a coagulation-flocculation-sedimentation-filtration-disinfection treatment train consistent with drinking-water engineering standards, and beneficial reuse of treatment sludge. The article concludes that consistent implementation of the UKL-UPL is an essential instrument for a professional engineer to ensure that water-supply infrastructure projects comply with occupational health and safety principles and environmental sustainability, while recommending periodic raw-water quality monitoring and community engagement as part of the engineer's professional and ethical responsibility.
Co-Authors Achmad Fauzan Hery Adi Putra, Bagus Ahmar, Ansari Saleh Ali Saifullah Andinusa Rahmandhika Astuti, Ary Dwi Budiono Budiono Daryono Daryono Defantyan, Etantyo Daffa Fadhil Adzanino Prayogo Heni Hendaryati Ilyas Masudin Karisma Rizal Lud Waluyo Lutfi, Vicky Thorikhotul M Choirul Muzaini Machmud Effendy Machmud Effendy Moch Agus Kresno Moch Agus Kresno, Moch Agus Moch. Agus Krisno Budiyanto muhammad irfan Muhammad Irfan Muhammad Nizar Murjito Murjito Nafiiyah, Nur Pringga P, Okta Samin Samin Satworo Adiwidodo Sayid Muhammad Sayid Muhammad, Sayid Sentot Achmadi Sudarman . Sudarman . Sudarman Sudarman Sudarman Sudarman Sujono Sujono Suwignyo . Suwignyo, Suwignyo Suyatno Suyatno Yepy Komaril Sofi’i Zakaria, Arie