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All Journal Journal of Engineering and Science Application Multidisciplinary Indonesian Center Journal
Sinaga, Boy Andika
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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.
Co-Authors Darma, Frandika Rahmadhani, Rahmadhani