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All Journal International Journal of Science and Society (IJSOC) Journal of Engineering and Science Application Multidisciplinary Indonesian Center Journal
Sinaga, Boy Andika
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Religion Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Materials Science & Nanotechnology Social Sciences Other

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The Duration of Sodium Methoxide Catalyst Impregnation in Methanol and Its Impact on the Reduction Monoglyceride Content in Biodiesel Production Sinaga, Boy Andika; Darma, Frandika; Rahmadhani, Rahmadhani
Journal of Engineering and Science Application Vol. 2 No. 1 (2025): April
Publisher : Institute Of Advanced Knowledge and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69693/jesa.v2i1.17

Abstract

Biodiesel is one of the most promising alternatives to replace conventional fuel products, specifically diesel. The increasing use of biodiesel is currently a focus of many researchers aiming to improve its quality, one of which involves reducing the monoglyceride content. High monoglyceride content can cumulatively affect the performance of diesel engines. Several techniques are used to reduce the monoglyceride content in biodiesel, one of which is maximizing the transesterification reaction. This study focuses on the preparation stage before the transesterification reaction, where the treatment involves variations in the impregnation of sodium methoxide (NaOCH3) in methanol (CH3OH). The impregnation durations tested were 0, 10, 20, 30, and 40 minutes during chemical mixing. The transesterification process was then carried out at reaction temperatures of 62°C and 64°C. The results indicate that the duration of impregnation between sodium methoxide (NaOCH3) and methanol (CH3OH) affects the reduction of the monoglyceride content. The optimal condition identified in this study was an impregnation duration of 20 minutes at a reaction temperature of 62°C, which resulted in a monoglyceride content of 0.3629%.
THE EFFECT OF MICROMANAGE LEADERSHIP STYLE ON GENERATION Z WORKERS: SELF-EFFICACY AS A MEDIATION OF JOB SATISFACTION Sinaga, Boy Andika
Multidisciplinary Indonesian Center Journal (MICJO) Vol. 2 No. 2 (2025): Vol. 2 No. 2 Edisi April 2025
Publisher : PT. Jurnal Center Indonesia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62567/micjo.v2i2.645

Abstract

In order to show how a micromanaged leadership style impacts job satisfaction among generation Z employees, this study used self-efficacy as a mediating variable. The study's sample and demographic were Riau Province's Generation Z workers, who were born between 1997 and 2012. The sample size consisted of 203 respondents using a non-probability sampling approach and a questionnaire survey for data collection. The study's conclusions were tested using SmartPLS 3. It featured an outside model, like a validity and reliability test, and an interior model, such a model fit test and a research hypothesis test. The results of the investigation demonstrated the validity and accuracy of each indicator. The hypothesis test results demonstrated that job satisfaction was positively and significantly impacted by self-efficacy, that self-efficacy was positively and significantly impacted by micromanaged leadership style, and that job satisfaction was not significantly impacted by leadership style. Indirect hypothesis testing using self-efficacy as a mediator between job satisfaction and the micromanaged leadership style produced positive and significant results. The results of the study indicate that the relationship between work happiness and micromanagement leadership style can be totally mediated by self-efficacy.
Enhancement of Organizational Commitment among Management Trainee Graduates: The Influence of Training, Career Development, and Work-Life Balance Mediated by Work Motivation Sinaga, Boy Andika; Utomo, Kabul Wahyu; Rahayu, Heffi Christya
International Journal of Science and Society Vol 6 No 3 (2024): International Journal of Science and Society (IJSOC)
Publisher : GoAcademica Research & Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54783/ijsoc.v6i3.1223

Abstract

Organizational commitment is a critical variable in reducing employee turnover intentions. Enhancing organizational commitment can be facilitated through factors such as training, career development, work-life balance, and work motivation. The objective of this research is to identify the significant direct impact of training, career development, and work-life balance on organizational commitment and work motivation, as well as to demonstrate the significant indirect impact mediated by work motivation between training, career development, and work-life balance on organizational commitment. This study was conducted on staff employees who are graduates of the Management Trainee program at Company Group X, with a sample size of 202 respondents, utilizing probability sampling techniques. The independent variables in this study include training (X1), career development (X2), and work-life balance (X3), while the mediating variable is work motivation (Z), and the dependent variable is organizational commitment (Y). The research data were analyzed using the Structural Equation Model-Partial Least Square (SEM-PLS) method with Likert scale measurements. The hypothesis testing results indicate a positive and significant influence of training (X1), career development (X2), work-life balance (X3), and work motivation (Z) on organizational commitment (Y), as well as a positive and significant influence of training (X1), career development (X2), and work-life balance (X3) on work motivation (Z). The indirect influence hypothesis test shows that training (X1), career development (X2), and work-life balance (X3) have a positive and significant effect on organizational commitment (Y) mediated by work motivation (Z).
Co-Authors Darma, Frandika Kabul Wahyu Utomo Rahmadhani, Rahmadhani