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All Journal Jurnal Rekayasa Mesin Journal of Energy, Mechanical, Material and Manufacturing Engineering Jurnal Elemen Jurnal Abdi Insani International Journal of Mechanical Engineering Technologies and Applications (MECHTA) ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat Jurnal Kesehatan dr. Soebandi International Journal of Industrial Innovation and Mechanical Engineering ⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Jurnal Elektronika dan Telekomunikasi
Ahmad Robittah
Politeknik Unggulan Kalimantan
Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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PENGARUH JUMLAH LUBANG UDARA TERHADAP UNJUK KERJA KOMPOR BRIKET BERBAHAN BAKU SERBUK KAYU MERANTI akhmad syarief; Akhmad Robittah
ELEMEN : JURNAL TEKNIK MESIN Vol 9 No 1 (2022)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v9i1.186

Abstract

Abstrak. Biomassa merupakan energi alternatif bisa dimanfaatkan dengan proses pembakaran menggunakan kompor, namun demikian kompor yang ada saat ini efesiensinya masih rendah. Aliran udara pada tabung bakar dan tabung pelindung merupakan variabel-variabel yang mempengaruhi. Pada penelitian ini meneliti jumlah lubang udara tabung bakar dan jumlah lubang udara tabung pelindung terhadap unjuk kerja kompor biomassa. Pengujian dilakukan menggunakan jumlah lubang udara tabung bakar 0, 16, 32 dan jumlah lubang udara tabung.pelindung 6, 12, 18, 24. Pengujian menggunakan water boiling test (WBT). Dengan air dalam panci dipanaskan sampai titik didih 100oC. Parameter pada penelitian adalah Boiling time, FCR, efesiensi. Hasil penelitian diperoleh boiling time 336 detik adalah yang tercepat, FCR 0,333.kg/jam pada jumlah tabung bakar 32 dan jumlah tabung pelindung 24. Efesiensi tertinggi adalah 16 % pada jumlah lubang tabung bakar 0 dan jumlah lubang tabung pelindung 6. Kata Kunci: kompor biomassa, boiling time, FCR, efesiensi.
Effect of Alkalization Duration and the Orientation of Fiber on Composites of Polyester Reinforced Fibre of Terap Tree (Artocarpus Elasticus) on Impact and Bending Strength Syarif, Akhmad; Sumantri, Dhenny; Robittah, Ahmad; Prayogi, Syafa'at
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.2

Abstract

Composite application has increased in recent years due to many advantages, e.g. In Kalimantan, there are many types of flora, one of which is the Terap tree (Artocarpus elasticus) which has a strong enough strength and is usually used by the Dayak people as clothing, hats, and rigging. In this research, we examine the laminate composite of tree skin fibers against bending strength and impact price. In making composites using a variety of alkali time, namely 60 minutes, 90 minutes and 120 minutes, the amount of alkali concentration used is 15% of the total volume of alkaline liquid. Then also use variations of fiber orientation 0o-900-00-900, 00-900-900-00, and 900-00-00-900. The impact test results showed that the highest value was obtained in specimens with an immersion time of 90 minutes with 00-900-00-900 orientation of 0.00294 joule / mm2 and the lowest value was found in specimens with immersion time 120 minutes 00-900-00-900 amounting to 0.00164 joules / mm2. While the Bending test obtained the highest value in specimens with 120 minutes of immersion time with 00-900-00-900 fiber orientation of 48.01 mph and the lowest value was obtained in specimens with 60 minutes immersion time at 900-00-00-900 for 16.62 MPa.
ECO – INNOVATIVE CARBURIZING: ENHANCING STEEL ST 37 WITH ALABAN CHARCOAL AND EGGSHELL CATALYSTS Ahmad Robittah; Suprapto, Wahyono; Widodo, Teguh Dwi; Wirawan , Willy Artha; Sabitah, A’yan
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.13

Abstract

This study examines the enhancement of St 37 steel through an eco-friendly carburization process using Alaban charcoal and eggshell catalyst. The agriculture sector in South Kalimantan, Indonesia, depends largely on metal tools made from low-carbon steel, which need greater hardness and durability. Traditional carburization techniques are costly and often lead to uneven carbon distribution. This research investigates the use of Alaban wood charcoal and local duck eggshell waste as carburizing agents. The experiment involved varying the weight ratio of charcoal to eggshell powder, then carburizing at 950°C for two hours, followed by water quenching. The results indicated a notable increase in surface carbon content, diffusion depth, hardness, and microstructure of St 37 steel. The optimal combination, achieving the highest surface hardness of 947 HV and a carbon diffusion depth of 1.0 mm, was found at an eggshell catalyst concentration of 30%. All samples exhibited a microstructural change to martensite. These results demonstrate the potential of using agricultural waste to enhance steel properties, promoting more sustainable and cost-effective industrial practices.
Analisis Kandungan Karbon dan Kekerasan Baja AISI 1020 dengan Variasi Media Karburasi Batubara Lignit dan Cangkang Telur Adawiyah, Rabiatul; Rahman, Noor; Sabitah, A'yan; Ardiyat, Ichwan Noor; Robittah, Ahmad
Jurnal Rekayasa Mesin Vol. 19 No. 3 (2024): Volume 19, Nomor 3, Desember 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i3.5937

Abstract

Karburisasi adalah proses perlakuan panas yang meningkatkan kekerasan dan ketahanan aus baja karbon rendah, seperti AISI 1020, yang sering digunakan dalam industri. Penelitian ini bertujuan untuk mengevaluasi pengaruh fraksi berat batubara lignit dan cangkang telur sebagai media karburasi terhadap kandungan karbon, kekerasan, dan struktur mikro baja AISI 1020. Karburasi dilakukan dengan lima variasi fraksi berat (60-100% batubara lignit dan 0-40% cangkang telur) selama dua jam, diikuti pendinginan udara. Kandungan karbon diukur menggunakan optical emission spectrometer (OES), kekerasan diuji dengan microvickers, dan struktur mikro dianalisis menggunakan scanning electron microscope (SEM). Hasil menunjukkan bahwa penambahan cangkang telur sebagai katalis meningkatkan kandungan karbon hingga 0,955%, dengan kekerasan tertinggi sebesar 3937 HV pada variasi 30% cangkang telur. Struktur mikro baja berubah dari dominasi ferit-perlit menjadi lebih banyak perlit-sementit. Kombinasi batubara lignit dan cangkang telur terbukti efektif dan ramah lingkungan
SOSIALISASI SANITASI DAN HIGIENITAS DI LINGKUNGAN KERJA UD. SU’AIDI SALMAH Zaini, Muhammad; Salman, Yuliana; Hariyono, Muhammad Akbar; Tahdi, Muhammad; Robittah, Ahmad; Isna, Isna; Hazizah, Hazizah; Widyawati, Tri Aksari; Priyadi, Budi
Jurnal Abdi Insani Vol 12 No 10 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i10.2991

Abstract

Sanitasi dan higienitas merupakan faktor penting dalam menjamin mutu produk kesehatan dan kosmetika tradisional. Namun, masih banyak pelaku industri kecil yang menghadapi keterbatasan fasilitas dan kurangnya pemahaman tenaga kerja dalam penerapan prinsip sanitasi yang baik. Kondisi ini dapat meningkatkan risiko kontaminasi silang dan menurunkan kualitas produk. Oleh karena itu, diperlukan intervensi berupa sosialisasi dan edukasi yang tepat untuk memperkuat pemahaman pekerja terkait praktik sanitasi dan higienitas di lingkungan kerja. Tujuan kegiatan ini adalah meningkatkan pengetahuan dan pemahaman pekerja UD. Su’aidi Salmah tentang prinsip sanitasi dan higienitas dalam mendukung mutu dan keamanan produk bedak dingin Bunga Tanjung. Metode kegiatan dilakukan melalui ceramah interaktif yang dilengkapi dengan media presentasi power point dan brosur bergambar. Evaluasi pemahaman peserta dilakukan menggunakan instrumen pretest dan posttest, dengan indikator capaian skor >80 sebagai standar pemahaman baik. Hasil kegiatan menunjukkan adanya peningkatan pemahaman peserta, dengan nilai rata-rata pretest sebesar 93,64 dan meningkat menjadi 97,27 pada posttest. Sebelum sosialisasi, sebanyak 91% peserta memperoleh nilai di atas 80, sedangkan setelah kegiatan, seluruh peserta (100%) mencapai skor >80. Selain itu, peserta memberikan respon positif terhadap materi dan metode penyampaian, serta menunjukkan minat dalam menerapkan prinsip sanitasi di lingkungan kerja. Dukungan dari pengelola UD. Su’aidi Salmah turut menjadi indikator penting dalam menjamin keberlanjutan program. Kesimpulan kegiatan ini adalah sosialisasi sanitasi dan higienitas terbukti efektif dalam meningkatkan pemahaman peserta serta mendorong penerapan prinsip kebersihan di lingkungan kerja secara konsisten.
Biomass-Derived Surface Engineering of AISI 1020 Steel for Electromedical Applications Robittah, Ahmad; Akbar Hariyono, Muhammad; Sabitah, A'yan; Achmadi Achmadi; Kusuma Wardani, Ika
International Journal of Industrial Innovation and Mechanical Engineering Vol. 3 No. 1 (2026): February: International Journal of Industrial Innovation and Mechanical Enginee
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/ijiime.v3i1.387

Abstract

This study investigates biomass-derived surface engineering of AISI 1020 steel for electromedical applications using galam wood charcoal and chicken bone waste as carburizing media. Surface modification is required to improve the mechanical performance of low-carbon steel, particularly in applications that demand high wear resistance and long-term durability. A pack carburizing approach was applied using various ratios of biomass-derived media at a treatment temperature of 800 °C for 2 hours. Chemical composition was analyzed using Optical Emission Spectroscopy (OES), surface hardness was evaluated using Micro Vickers hardness testing, and microstructural characteristics were observed using optical microscopy. The results show a significant increase in surface carbon content with increasing fractions of chicken bone powder, indicating its effectiveness as a carbon donor and diffusion promoter. The surface hardness increased from approximately 150 HV in the untreated condition to a maximum of about 860 HV in the treated specimen. Microstructural observations revealed the formation of a distinct carburized layer with increasing thickness and uniformity, consistent with enhanced carbon diffusion and surface strengthening. These findings demonstrate that biomass-derived surface engineering provides an effective and sustainable approach for improving the surface properties of low-carbon steel. The proposed method offers strong potential for environmentally friendly manufacturing of durable and reliable electromedical components.
In Silico Study of Bay Leaf (Syzygium polyanthum) Compounds as Renin Inhibitors and Antihypertensive Herbal Tea Development Blegoh Iwan Santoso; Siti Nur Hikmah; ahmad Robitah; Khrisna Agung Cendikiawan; Kintoko
Jurnal Kesehatan dr. Soebandi Vol 14 No 1 (2026): Jurnal Kesehatan dr. Soebandi
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas dr. Soebandi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36858/jkds.v14i1.1112

Abstract

Background :  Hypertension is a major global health problem contributing significantly to cardiovascular morbidity and mortality. One of the key pathways in blood pressure regulation is the Renin–Angiotensin– Aldosterone System (RAAS), where renin plays a crucial role as the initiating enzyme. Inhibition of renin is considered a more specific therapeutic strategy with potentially fewer side effects. Bay leaf (Syzygium polyanthum) has been traditionally used as an antihypertensive agent and contains various bioactive compounds Methods : This study aims to evaluate the potential of bay leaf compounds as renin inhibitors using an in silico approach and to explore their development into herbal tea products. Active compounds were identified through literature-based LC-MS data, including gallic acid, malic acid, luteic acid, and myricetin. Molecular docking was performed using AutoDock Vina against human renin (PDB ID: 3D91). Results: The results showed that myricetin exhibited the highest binding affinity (-9.3 kcal/mol), followed by luteic acid (-7.9 kcal/mol), gallic acid (-6.1 kcal/mol), and malic acid (- 5.1 kcal/mol), compared to the standard inhibitor remikiren (-10.3 kcal/mol). Conclusions: Interaction analysis revealed that myricetin formed multiple hydrogen bonds with catalytic residues. These findings suggest that bay leaf compounds, especially myricetin, have potential as natural renin inhibitors and could be developed as antihypertensive herbal tea.
Optimization of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) as an alternative biofuel Ichwan Noor Ardiyat; Noor Rahman; Jarot Wijayanto; A'yan Sabitah; Ahmad Robittah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42340

Abstract

This study aims to investigate the effect of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) and to evaluate its potential as an alternative biofuel. Torrefaction was carried out at 200°C, 250°C, and 300°C for 150 minutes under oxygen-limited conditions, and the resulting char, tar, and gas yields were quantified, while chemical changes were analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing temperature significantly affects product distribution, with the highest char yield (52%) obtained at 250°C and increased gas formation at 300°C. FTIR analysis revealed a progressive reduction of hydroxyl (O–H) and carbonyl (C=O) functional groups, indicating enhanced deoxygenation and carbonization at higher temperatures. These chemical transformations suggest improved thermal stability and fuel quality of the torrefied ironwood. It can be concluded that Eusideroxylon zwageri has strong potential as a renewable biofuel feedstock, with torrefaction at 250°C being the most suitable condition for solid biofuel production.
Penerapan Teknologi Tepat Guna Alat Pengering pada Produksi Bedak Dingin Bunga Tanjung Muhammad Zaini; Yuliana Salman; Muhammad Akbar Hariyono; Ahmad Robittah; Blegoh Iwan Santoso
ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2026): ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat
Publisher : UPT Publikasi dan Penerbitan Universitas San Pedro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59632/abdiunisap.v4i1.695

Abstract

Bedak dingin Bunga Tanjung merupakan produk kosmetik tradisional khas Kalimantan Selatan yang proses produksinya masih menghadapi kendala pada tahap pengeringan. Selama ini pengeringan dilakukan menggunakan sinar matahari sehingga sangat bergantung pada kondisi cuaca dan menyebabkan penurunan produktivitas pada musim penghujan. Kegiatan Pengabdian kepada Masyarakat (PKM) ini bertujuan menerapkan teknologi tepat guna berupa alat pengering bedak dingin berbasis energi listrik untuk meningkatkan efisiensi produksi dan higienitas proses pengeringan. Metode pelaksanaan meliputi identifikasi permasalahan dan kebutuhan mitra, perancangan dan pembuatan alat pengering, penyerahan dan pelatihan penggunaan alat, serta monitoring dan evaluasi penerapan teknologi. Alat pengering yang dihibahkan terdiri atas dua unit lemari pengering berbahan galvanis yang dilengkapi lampu pijar sebagai sumber panas dan thermostat controller untuk pengaturan suhu. Hasil kegiatan menunjukkan bahwa penggunaan alat pengering mampu mempercepat waktu pengeringan dari tiga hari menjadi satu hari per siklus produksi atau tiga kali lebih cepat dibandingkan metode konvensional. Dua unit alat pengering menghasilkan kapasitas produksi sebesar 75 pak atau setara 1.800 bungkus per siklus dengan proses yang lebih higienis karena terlindung dari kontaminasi debu dan mikroorganisme. Tingkat pemanfaatan alat mencapai 100% dan seluruh proses pengeringan telah beralih dari metode tradisional ke metode berbasis teknologi. Penerapan alat pengering terbukti meningkatkan efisiensi, produktivitas, dan kualitas proses produksi bedak dingin Bunga Tanjung.
Parametric Analysis of Reynolds Number Effects on Wake Region Characteristics in LBM-Based Fluid Flow Simulations Aulia Rahman; Putra Dwiantoko; Novan Habiburrahman; Djarot Winoto; Ahmad Robittah; Reinaldo Evan Audrey
⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/j7cd2273

Abstract

This study investigates the fundamental fluid dynamics of steady-state laminar flow past a circular cylinder using the Lattice Boltzmann Method (LBM) with a D2Q9 lattice arrangement. Developed using a vectorized Pythonic approach, the numerical solver employs the Bhatnagar-Gross-Krook (BGK) collision operator to resolve the mesoscopic particle distribution functions. The research focuses on the flow characteristics at low Reynolds numbers (Re) ranging from 20 to 70 to ensure stable convergence toward steady-state conditions. Results demonstrate that the LBM effectively captures critical hydrodynamic phenomena, including stagnation points, flow acceleration due to blockage effects, and the development of symmetric wake regions. Analysis reveals a linear correlation between increasing Reynolds numbers and the longitudinal elongation of the recirculation zone, confirming the solver's ability to maintain numerical stability and momentum conservation without the computational expense of conventional pressure-velocity coupling. These findings validate the use of open-source computational tools for rigorous fluid flow analysis and provide a robust dataset for future integration with multi-scale modeling and machine learning frameworks, such as Physics-Informed Neural Networks (PINNs).
Co-Authors A'yan Sabitah Achmadi achmadi achmadi Ahmad Faqih Habibi Akhmad Syarief Akhmad Syarif Ardiyat, Ichwan Noor Aulia Rahman Aulia Rahman Djarot Winoto Hafiz Al Farizi Hariyono, Muhammad Akbar Hazizah, Hazizah Ichwan Noor Ardiyat Isna Isna Jarot Wijayanto Khrisna Agung Cendekiawan Kintoko KUSUMA WARDANI, IKA Muhammad Zaini Muhammad Zaini Noor Rahman Noor Rahman, Noor Novan Habiburrahman Persadha, Galih Prayogi, Syafa'at Priyadi, Budi Putra Dwiantoko Rabiatul Adawiyah Reinaldo Evan Audrey Sabitah, A'yan Santoso, Blegoh Iwan Siti Nur Hikmah Sumantri, Dhenny Tahdi, Muhammad Teguh Dwi Widodo Wahyono Suprapto Widyawati, Tri Aksari Wirawan, Willy Artha Yuliana Salman Yuliana Salman