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All Journal International Journal of Renewable Energy Development Indonesian Journal of Chemical Analysis (IJCA) Nusantara Science and Technology Proceedings Automotive Experiences Indonesian Community Journal Research In Chemical Engineering Sewagati Journal Mechanical Engineering
Abdul Hamid
Department Of Mechanical And Industrial Engineering, Politeknik Negeri Madura
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Other

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Pengaruh Variasi Arus Pengelasan Gas Metal Arc Welding (GWAM) Terhadap Sifat Mekanis Pada Sifat Seamless Gracia Irene Huka; Leslie. S. Loppies; Josef Matheus; Auliana Diah Wilujeng; Abdul Hamid
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2116

Abstract

GMAW welding is a metal joining process with a melting process with the addition of a coil of wire in the form of electrodes and protective gas. Seamlees pipe, also known as seamless pipe, is an iron pipe without a connection. This study aims to produce data from the results of bending and impact testing on seamlees pipes by varying the welding current with a current of 21.5 volts, 22.5 volts, and 23.5 volts in GMAW welding. After the seamless pipe is welded, impact and bending tests are carried out on the seamlees pipe. From the bending/bending strength test, the highest flexural strength occurred at a current of 21.5 and 22.5 volts, while the lowest flexural strength occurred at a current of 23.5 volts. From the impact test, the highest strength occurred at 21.5 and 22.5 volts and the lowest was at 23.5 volts.  Keywords: Seamlees pipe, GMAW welder, Bending Strength, Impact Strength.  
Impact of Biodiesel on Diesel Engine Emissions and Performance Using Various Feedstocks: A Mini Review Abdul Hamid; Auliana Diah Wilujeng; Zeni Rahmawati
Research In Chemical Engineering (RiCE) Vol. 5 No. 2 (2026): Research in Chemical Engineering
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/rice.v5i2.432

Abstract

The transition toward sustainable energy has intensified research on renewable fuels for compression ignition engines. iodiesel is considered a promising replacement for fossil diesel because it is derived from renewable resources and exhibits inherent biodegradability, and inherent oxygen content. However, the physicochemical properties and combustion characteristics of biodiesel are strongly influenced by feedstock type, which subsequently affects engine performance and emission behavior. This mini review systematically evaluates the impact of biodiesel derived from various feedstocks including rapeseed, palm oil, soybean, Jatropha curcas, Calophyllum inophyllum, waste cooking oil (WCO), animal fats, microalgae, and hybrid blends on diesel engine performance parameters and exhaust emissions. The review indicates that most biodiesel blends (B5–B30) demonstrate performance characteristics close to conventional diesel, although slight reductions in brake power and torque (typically 3–9%) and increases in brake specific fuel consumption (BSFC) (approximately 2–13%) are commonly reported. These effects primarily stem from biodiesel’s inferior calorific value and higher kinematic viscosity in comparison with conventional diesel. From an emission perspective, biodiesel consistently reduces hydrocarbons (HC), carbon monoxide (CO), and particulate matter (PM) emissions by 10–36% due to improved oxidation from fuel-bound oxygen. However, a moderate increase in nitrogen oxides (NOx), typically ranging from 2–13%, is frequently observed and remains a major technical challenge. Overall, the findings highlight that feedstock selection significantly influences fuel properties, combustion dynamics, and emission profiles. Low-level blends such as B5–B20 generally provide an optimal balance between engine performance and emission reduction without requiring major engine modifications.
Co-Authors Adinda Rusdianti Maulani Putri Ahmad Mustofa Amin Jakfar Amin Jakfar, S.T.,M.T., Lukman Hadiwijaya, S.T.,M.T. Amri Muhaimin Amri Muhaimin Annafiyah Annafiyah Auliana Diah Wilujeng Auliana Diah Wilujeng Auliana Diah Wilujeng Auliana Diah Wilujeng Aurista Miftahatul Ilmah Dea Putri Pascha Didik Prasetyoko Faizatur Rohmah Faizatur Rohmah Faizatur Rohmah Faizatur Rohmah Gading Adian Kun Saidan Gading Adian Kun Saidan Gracia Irene Huka Ike Dayi Febriana Ike Dayi Febriana Ike Dayi Febriana Ike Dayi Febriana Ilmatus Sa'diyah Ilmatus Sa’diyah Jafni Fara Zahirah Jafni Fara Zahirah Josef Matheus Laily Ulfiyah Loppies, Leslie S Lukman Hadiwijaya Misbakhul Fatah Misbakhul Fatah Mohammad Abdullah Mohammad Abdullah Mohammad Anas Fikri Nabila Eka Ramadhani Nabila Eka Ramadhani Nadiyah Ulfah Noval Alfiansyah Nurir Rohmah Ratna Ayu Ratna Ayu Pawestri Kusuma Dewi Saiful Saiful Septian Dwi Wijaya Sirly Bifadilatur Romaniyah Tri Esti Purbaningtias Wahyu Budi Utomo Widiwurjani Zeni Rahmawati Zeni Rahmawati