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All Journal JURNAL PILAR EPI International Journal of Engineering Jurnal Engine: Energi, Manufaktur, dan Material JTM Jurnal Ekonomika dan Bisnis Islam Business and Investment Review
Wahab, Abd.
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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PENGARUH VARIASI TEKANAN INJEKTOR DAN PUTARAN TERHADAP PERFORMA DAN GAS BUANG PADA MOTOR DIESEL Ashari, Apri; Wahab, Abd.; Junaedi, Ena Marlina
Jurnal Teknik Mesin Vol 6, No 01 (2016): Jurnal Teknik Mesin
Publisher : UNIVERSITAS ISLAM MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (438.079 KB)

Abstract

The diesel fuel injection system is very important and closely related to combustion in diesel motors. The injector is a component of the diesel fuel injection system that serves to atomizes the into the combustion chamber. The combustion process in diesel motors is depend on the results of the injector fuel carburetion. The proper of injector pressure will produce better fuel carburetion and better combustion. This research aims to determine how much influence the fuel pressure in the injector of diesel engine performance and opacity smoke by setting the variation is tie up right or left to lessen the adjusting screw to add or reduce the fuel pressure. Diesel engine used were isuzu panther 2300 cc. In this experiment used engine test bed, in which the machine is placed on a stand, and then connected to dynamometer. The muffler is connected to smoke test. The parameters measured is the power, torque, specific fuel of consumption (SFC), effective specific fuel of consumption (ESFC) and opacity smoke. The results of experiment is seen the increase of power and torque after variation, and maximum at a pressure of 130 bar have 40,4 kW at 2500 rpm, and 16,8 kg.m at 1500 rpm. Pressure at 130 bar is better than pressure of 110 bar and 120 bar. The descending of opacity smoke result is seen at a pressure of 120 bar and 130 which have lowest 17,2 % and 16,8 % of opacity smoke at 1500 rpm, more advance engine turning is more high opacity smoke. More high pressure of injector and engine turning have is increase torque, effective power and reduce exhaust emission levels in diesel engine. But while the pressure increase then more high fuel consumption.
Effect of Temperature Variation PWHT Dissimilar Welding Low Carbon Steel ASTM A36 with ASTM A240 Type 316L Wahab, Abd.; Arma, Lukmanul Hakim; Arsyad, Hairul; Othman, Rozaini Bin
EPI International Journal of Engineering Vol 7 No 1 (2024): Volume 7 Number 1, February 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022024.05

Abstract

Abstract ASTM A36 low carbon steel is steel commonly used in construction, and the austenitic stainless steel 316L series is stainless steel with good corrosion resistance. Joining two dissimilar metals is unavoidable because it can provide good mechanical properties and resist corrosion at a low cost. This study studied the effect of variations in post-welding heating process temperature (PWHT) on mechanical properties and microstructure by shield metal arc welding (SMAW) low carbon steel ASTM A36 with ASTM A240 type 316L with a thickness of 6 mm with a single V connection and using an E308L-electrode. 16. The PWHT process was carried out to improve the weld results with variations in heating temperatures of 400, 600, and 900˚C with a holding time of 1 hour with 15% dromos quenching media. Testing mechanical properties includes hardness test using micro Vickers method on low carbon steel base metal, HAZ, weld metal, HAZ, and stainless steel base metal and impact test using Charpy method. Optical microscopes were used to study the microstructure of the area of the base metal, HAZ, and weld metal viewed using a laser scanning microscope. The test results show that the highest average hardness value in the weld metal area is in the specimen without PWHT with a value of 124.96 HV and samples with a PWHT temperature of 400˚C on the weld metal 121.63 HV and the lowest in the PWHT specimen 900˚C 76.17 HV. in the HAZ 316L area. The hardness value of the weld metal without PWHT and PWHT indicates that the hardness value is higher than the two-parent metals. While the impact test with PWHT specimens at 400˚C had higher impact energy than specimens without PWHT by 6.50 %, and the lowest was 16.26% at the optimum temperature of 900˚C, the shape of the samples showed ductile cracks.
Rancang Bangun Alat Pelurus Puncher Bar Wahab, Abd.; Hamarung, Mukhlis A.
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 8 No. 1 (2024)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v8i1.1816

Abstract

Round bar material with a diameter of 25,4mm is a type of material commonly used in the field of building construction and machinery spare parts. At PT. Vale Indonesia Tbk., this material is fabricated according to its design, which is called a puncher bar. A puncher bar is a tool used to clean the tuyere hole from nickel matte blockages in the PT converter section. Vale Indonesia. A series of cleaning processes can cause the puncher bar to bend at the ends or in the middle. The bent puncher bar was straightened manually in the production workshop of the Soroako Technical Academy. The process of straightening the puncher bar manually is considered less effective in terms of safety, time efficiency and worker productivity. The design of this machine consists of several components, namely the machine frame, electric motor, speed reducer, gears, towing roller, and towing roller. The stages of making a machine start from design, manufacturing, assembly, and testing. The puncher bar straightening machine has dimensions of 930 mm x 702 mm x 1129 mm with a main drive of a 5.5 HP electric motor with 1440 rpm. Vee belts and gears as rotation transmitters. The towing roller uses AISI 4140 alloy steel with a diameter of 5 inches and the guide roller uses mild steel with a diameter of 4 inches. This machine can straighten puncher bars with a maximum bend of 6 cm with a final bend of 1.5 cm with a processing time of 1 minute
Consumer Behavior Assolo’ Pada Acara Pernikahan Suku Kajang Dalam Pesektif Maslahah Ista, Akram; Muchlis, Saiful; Wahab, Abd.
Business and Investment Review Vol. 2 No. 2 (2024)
Publisher : CV. Lenggogeni Data Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61292/birev.102

Abstract

The purpose of this research is to describe, explain about consumer behavior assolo’ the wedding event in Suku Kajang in perspective maslahah. This research is qualitative research, the type of research is field research and using an ethnographic approach method. The data collection methods used were observation and interviews. The research results show that consumer behavior assolo' the wedding event in the Kajang Tribe in perspective maslahah namely: 1) pregnant maslahah in the form of maintaining honor and self-respect/say',2) pregnant Maslahah in the form of taawwun values ​​and the embodiment of friendship, and 3) containsThe Value of Maslahah as a Means of Transaction, Distribution of Wealth and Welfare of Property Ownership.So starting from the description above, it can be understood that consumer behavior assolo' the wedding event in the Kajang Tribe in perspective maslahah directly maintain the objectives of Sharia'. Because considering the benefit dimension, besides that assolo' People hold wedding ceremonies to make it easier for them to live their lives, and to keep them away from the negative stigma of society's views.
EKONOMI SYARIAH VS EKONOMI KONVENSIONAL Reni, Reni; Wahab, Abd.; Lutfi, Muhtar
PILAR Vol. 13 No. 2 (2022): JURNAL PILAR, DESEMBER 2022
Publisher : Universitas Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26618/fbqm6t54

Abstract

AbstractSyariahic economics and conventional economics are two different economic systems which from time immemorial have become one of the determining factors for success in the economic development of a country and even the world economy. This study aims to describe the application and contribution of the two economic systems in building the country's economy. This study uses a qualitative approach with library research, which is a series of activities carried out with regard to the method of collecting library data, or studies explored through various library information. (books, encyclopedias, scientific journals, newspapers, magazines, and documents), which discuss the Conventional Economic System and the Syariahic Economic System. The results of the study show that the Conventional Economic System consists of 2 economic systems, namely; 1) Capitalism economic system that developed because of the policies of colonialism and imperialism that affect Asian and African countries where this system is based on the struggle for freedom where the government may not take part in its implementation. 2) a socialist economic system that arises as a result of protests over injustices applied to the capitalist economic system where the rich are getting richer, and the poor are getting poorer, this is the socialist economic system that comes with providing considerable freedom but with a note that the government takes part in its implementation. Furthermore, the Syariahic Economic System is an economic system that has finally become a solution to various problems that have arisen so far. and the poor are getting poorer, this is a socialist economic system that comes with providing considerable freedom but with a note that the government takes part in its implementation. Furthermore, the Syariahic Economic System is an economic system that has finally become a solution to various problems that have arisen so far. and the poor are getting poorer, this is a socialist economic system that comes with providing considerable freedom but with a note that the government takes part in its implementation. Furthermore, the Syariahic Economic System is an economic system that has finally become a solution to various problems that have arisen so far. Keywords: Syariahic Economics; Economics of Capitalism, Economics of Socialism
DETERMINAN NIAT MEMBELI MAKANAN HALAL SECARA ONLINE DI INDONESIA: INTEGRASI UNIFIED THEORY OF ACCEPTANCE AND USE OF TECHNOLOGY (UTAUT) DAN THEORY OF PLANNED BEHAVIOR (TPB) Lestari, Nurrizka Puji; Wahab, Abd.; Widiastuti, Tika
Jurnal Ekonomika dan Bisnis Islam Vol 8 No 1 (2025): April
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jekobi.v8n1.p33-52

Abstract

This study aims to analyze the factors influencing the intention to purchase halal food through online platforms among Generation Z in Indonesia. The research is based on data from 145 respondents, analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM). The results indicate that facilitating conditions and social influence do not significantly affect attitude, although social influence has a significant impact on purchase intention. Performance expectancy significantly influences both attitude and intention, while effort expectancy significantly affects attitude but not intention. Overall, attitude has a significant impact on purchase intention. Based on these findings, Shopee Barokah should enhance its performance by ensuring the platform is user-friendly through optimized interface design and the addition of features that simplify the purchasing process. Moreover, advertisements featuring influencer reviews can be strengthened to leverage the significant effect of social influence on purchase intention. Ensuring smooth technological and infrastructural support such as responsive customer service, secure payment methods, and fast delivery can further boost Generation Z’s intention to shop on the platform.
Co-Authors Akram Ista Ashari, Apri Ena Marlina Hairul Arsyad Hamarung, Mukhlis A. Lestari, Nurrizka Puji Lukmanul Hakim Arma Lutfi, Muhtar Othman, Rozaini Bin Reni Reni, Reni Saiful Muchlis, Saiful Tika Widiastuti