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All Journal Jurnal Teknologi Industri Pertanian Abjadia, International Journal of Education Jurnal Elemen Jurnal Ekonomi, Bisnis dan Manajemen
Yusuf Akbar
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Other

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Diesel Oil Biodegradation Process By Mixed Culture Of Hydrocarbon Degrader Bacteria Mohamad Yani; Yusuf Akbar
Jurnal Teknologi Industri Pertanian Vol. 19 No. 1 (2009): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Three isolates name as Pseudomonas aeruginosa (PA), Pseudomonas pseudomallei (PP) and Enterobacter agglomerans (EA) are petroleum hydrocarbon degrader bacteria. They were grown in mineral medium and 10% diesel oil as carbon source. The diesel oil biodegradation by PAEA and PPEA are better than single or other mixed cultures. The diesel oil compounds are oxidized to intermediate product and detected as fatty acids ranged of nC18 to nC8, organic acids, and then it was mineralized. The mineralized products measured as methane, carbon dioxide, and carbon monoxide. This result showed that during hydrocarbon biodegradation of aliphatic compounds by those isolates through fatty acids formation, simple organic acids, and simple volatile organic carbon. The mineralized product of methane, carbon dioxide, and carbon monoxide were emitted to the environment. Keywords: Biodegradation, diesel oil, Pseudomonas, Enterobacter, minerallized
ANALISA VARIASI UKURAN VENTURI KARBURATOR TERHADAP KONSUMSI BAHAN BAKAR PADA SEPEDA MOTOR YAMAHA RX-KING 135cc Kurnia Dwi Artika; Yusuf Akbar
ELEMEN : JURNAL TEKNIK MESIN Vol 3 No 1 (2016)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.614 KB) | DOI: 10.34128/je.v3i1.12

Abstract

Penggunaan sepeda motor saat ini mengalami peningkatan yang sangat pesat. Dampaknya adalah konsumsi bahan bakar yang juga meningkat. Teknologi sepeda motor semakin maju dan berkembang, dari mesin 2 tak menjadi 4 tak, dari sistem bahan bakar karburator menjadi injeksi. Sepeda motor RX-King masih menggunakan mesin 2 tak dan sistem karburator. Di dalam karburator terdapat lubang/pipa venturi yang pengaruhnya sangat besar terhadap putaran mesin dan konsumsi bahan bakar sesuai besarnya diameter venturi. Dari latar belakang tersebut, maka dapat dilakukan analisa pengaruh ukuran venturi terhadap konsumsi bahan bakar. Penelitian dilakukan dengan variasi ukuran venturi karburator 26,3 mm, 27,8 mm dan 28,8 mm dengan putaran mesin 4000 rpm (54 km/jam) dan bahan bakar premium. Pengujian dilakukan dengan mengukur dan mencatat waktu dari konsumsi bahan bakar, kemudian menganalisa venturi standart, perbesaran dan pengecilan diameter venturi. Adapun hasil dari setiap diameter venturi karburator terhadap konsumsi bahan bakar adalah masing-masing venturi 26,3 mm adalah 8,48 menit, pada venturi 27,8 mm (standart) adalah 7,14 menit dan pada venturi 28,8 mm adalah 6,15 menit. Sehingga pengecilan diameter venturi karburator dapat mengurangi konsumsi bahan bakar 18,77% tanpa mengurangi kinerja/performa kendaraan.
The Effect of Discipline, Work Motivation and Work Ability on Employee Performance PT. Bijak Unit Learning Center Bogor Yusuf Akbar; Sudarijati Sudarijati; Ismartaya Ismartaya
Jurnal Ekonomi, Bisnis dan Manajemen Vol. 3 No. 3 (2024): September : Jurnal Ekonomi, Bisnis dan Manajemen (EBISMEN)
Publisher : FEB Universitas Maritim Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ebismen.v3i3.2477

Abstract

This study aims to determine the effect of discipline, work motivation and work ability on the performance of employees of PT BIJAK Bogor Learning Center Unit either simultaneously or partially. Questionnaires were distributed to 101 respondents. The results of the validity and reliability tests indicated that all questions were stated to be valid and reliable. The results of multiple correlation analysis stated that there were very strong relationships between discipline, work motivation and work ability on the performance of employees of PT BIJAK, the result of the coefficient of determination can be explained by 70.8%. The multiple regression analysis F test (simultaneous) states that there is a positive and significant effect simultaneously between discipline, work motivation and work ability on the performance of employees of PT WISE. The results of the t (partial) test state that discipline has a positive and significant effect on employee performance, work motivation has a positive and significant effect on employee performance, and work ability has a positive and significant effect on employee performance at PT. BIJAK Bogor Learning Center Unit.
Quality Management of Facilities and Infrastructure within the Postgraduate Program at UIN Maulana Malik Ibrahim Malang Akbar, Yusuf; Harnika, Lika; Wulandari, Sri; Fikri, Shofil
Abjadia : International Journal of Education Vol 10, No 4 (2025): Abjadia
Publisher : Universitas Islam Negeri Maulana Malik Ibrahim Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/abj.v10i4.35147

Abstract

The quality management of facilities and infrastructure needs to be well understood. The quality of learning can also be determined by the effectiveness of facilities and infrastructure management. This study identifies the issue of how the quality management process of facilities and infrastructure is carried out within the postgraduate environment of UIN Maulana Malik Ibrahim Malang. This study aims to provide knowledge about the stages of quality management of facilities and infrastructure in the theory of Purwasih & Sahnan (2022) and to explore the process of quality management of facilities and infrastructure in the postgraduate environment of UIN Maulana Malik Ibrahim Malang. This type research is field-based qualitative research. Data collection techniques include observation, interviews, and documentation. The primary data sources were interviews with two informants, namely the head of administration and the financial manager, as well as documents on facilities and infrastructure at the Postgraduate Program of UIN Maulana Malik Ibrahim Malang. Secondary data sources are obtained from books, journals, and scientific articles related to quality management of facilities and infrastructure. The findings show that the postgraduate program of UIN Maulana Malik Ibrahim Malang carries out management processes for facilities and infrastructure through planning, procurement, distribution, maintenance, disposal, and supervision of items such as projectors, whiteboards, LCD TVs, desks, chairs, buildings and classrooms, libraries, laboratories, and others. These processes are carried out Purwasih and Sahnan (2022) framework of facilities and infrastructure quality management. From these findings, it can be understood what units are needed and how the implementation process of quality management of facilities and infrastructure is conducted in the higher education environment.
Co-Authors Harnika, Lika Ismartaya Ismartaya Kurnia Dwi Artika Moh. Yani Shofil Fikri Sri Wulandari Sudarijati