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All Journal Jurnal Pilar Journal of Leadership in Organizations EPI International Journal of Engineering Jurnal Engine: Energi, Manufaktur, dan Material JTM Airlangga International Journal of Islamic Economics and Finance Jurnal Ekonomika dan Bisnis Islam Kartika: Jurnal Studi Keislaman Business and Investment Review
Wahab, Abd.
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Religion Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education 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.
Leadership in Halal Business Sector: Bibliometric Analysis and A Roadmap for Future Research Fitriani, Fitriani; Wahab, Abd.; Hendratmi, Achsania
Journal of Leadership in Organizations Vol 7, No 2 (2025): Journal of Leadership in Organizations
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jlo.103552

Abstract

Introduction/Main Objectives: This study investigates leadership's role in the halal business sector, focusing on Islamic principles such as justice, integrity, and ethical decision-making. Leadership is crucial for business growth and addressing ethical and operational challenges in the expanding halal industry. This topic is significant due to the rising global demand for halal products and the need for leadership to ensure compliance with Islamic standards and sustain competitiveness. Background Problems: The halal sector faces standardization discrepancies, workforce development, and market competitiveness. This research asks: What are the trends, gaps, and future directions in leadership research within halal enterprises? Novelty: This study is the first to apply bibliometric analysis to leadership in halal enterprises, reviewing research from 1999 to 2024. Previous studies lacked exploration of leadership's role in fostering innovation, sustainability, and compliance. Research Methods: Bibliometric analysis of 60 Scopus-indexed publications using R-biblioshiny, Excel, and VOSviewer examines trends, collaborations, and gaps, complemented by content analysis. Finding/Results: Ethical leadership, strategic management, and innovation enhance halal businesses' competitiveness and compliance. Gaps highlight the need for interdisciplinary collaboration and leadership framework exploration. Conclusion: Leadership is essential for ethical challenges, sustainable growth, and global competitiveness, as well as for integrating ethics, innovation, and strategic management for halal industry success.
DOES ZAKAT AS AN ISLAMIC SOCIAL FINANCE INSTRUMENT, MAINTAIN PUBLIC PURCHASING POWER? Fitriani, Fitriani; Wahab, Abd.; Herianingrum, Sri
Airlangga International Journal of Islamic Economics and Finance Vol. 8 No. 02 (2025): July-December 2025
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/aijief.v8i02.71229

Abstract

The decrease in public purchasing power within Indonesian society in 2024 has emerged as a critical issue that may precipitate a broader economic crisis. This study aims to examine the function of zakat in enhancing public purchasing power and fostering economic stability through wealth redistribution. Zakat, as an Islamic social financial mechanism, has the potential to mitigate income inequality by augmenting the financial resources of marginalized groups, thereby increasing their aggregate expenditure. This study utilizes a literature review approach, adhering to the PRISMA model to systematically identify and analyse relevant articles. The findings suggest that productive zakat, which prioritizes economic empowerment through the allocation of business capital and training, exerts a substantial influence on the long-term economic independence of its beneficiaries. Moreover, zakat operates as an automatic stabilizer within the economy, aiding in the maintenance of public purchasing power, particularly during periods of economic strain. This study corroborates the hypothesis that zakat functions as a mechanism for income redistribution and has a multiplier effect that increases demand for goods and services, thereby promoting inclusive economic growth. Therefore, zakat has the potential to function as a strategic solution for enhancing public purchasing power, maintaining economic stability, and strengthening overall socio-economic resilience. Keywords: Zakat, Purchasing Power, Economic Stability, Economic Empowerment, Islamic Economics.
Penerapan Metode Questions Students Have dalam Meningkatkan Minat Belajar Siswa pada Mata Pelajaran Akidah Akhlak Wahab, Abd.; Nurhayati, Sri
Kartika: Jurnal Studi Keislaman Vol. 5 No. 3 (2025): Kartika: Jurnal Studi Keislaman (November)
Publisher : Lembaga Pendidikan Tinggi Nahdlatul Ulama (LPT NU) PCNU Kabupaten Nganjuk

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59240/kjsk.v5i3.392

Abstract

This study aims to analyze the implementation of the Questions Students Have (QSH) method and its impact on increasing students’ learning interest in the subject of Aqidah and Akhlak. Low learning interest among students is often caused by teaching methods that do not actively engage them in the learning process. The QSH method encourages students’ participation and curiosity by providing opportunities to express questions that arise during learning activities. This research employed a qualitative descriptive approach, with data collected from principals, subject teachers, and students through interviews, observations, and documentation. The data were analyzed descriptively to identify patterns and impacts of the QSH method. The results show that (1) the QSH method is implemented by distributing question sheets, allowing students to formulate questions individually, followed by group discussions; and (2) the method effectively increases learning interest, as reflected in students’ enthusiasm, attentiveness, willingness to ask questions, and active participation in discussions. Therefore, the QSH method can serve as an effective pedagogical strategy to foster students’ engagement and motivation in Aqidah and Akhlak learning.  
Co-Authors Achsania Hendratmi Akram Ista Ashari, Apri Ena Marlina Fitriani Fitriani Hairul Arsyad Hamarung, Mukhlis A. Lestari, Nurrizka Puji Lukmanul Hakim Arma Lutfi, Muhtar Othman, Rozaini Bin Reni Reni, Reni Saiful Muchlis, Saiful Sri Herianingrum Sri Nurhayati Tika Widiastuti