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All Journal Jurnal Pertanian Agros Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Makara Journal of Technology
Warjito Warjito, Warjito
Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Modification of Flow Structure Over a Van Model By Suction Flow Control to Reduce Aerodynamics Drag Harinaldi, Harinaldi; Budiarso, Budiarso; Warjito, Warjito; Kosasih, Engkos Achmad; Tarakka, Rustan; Simanungkalit, Sabar Pangihutan; Lay Teryanto, I Gusti Made Fredy
Makara Journal of Technology Vol. 16, No. 1
Publisher : UI Scholars Hub

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Abstract

Automobile aerodynamic studies are typically undertaken to improve safety and increase fuel efficiency as well as to find new innovation in automobile technology to deal with the problem of energy crisis and global warming. Some car companies have the objective to develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic drag. Some flow control method provides the possibility to modify the flow separation to reduce the development of the swirling structures around the vehicle. In this study, a family van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed body). This model is equipped with a suction on the rear side to comprehensively examine the pressure field modifications that occur. The investigation combines computational and experimental work. Computational approach used a commercial software with standard kepsilon flow turbulence model, and the objectives was to determine the characteristics of the flow field and aerodynamic drag reduction that occurred in the test model. Experimental approach used load cell in order to validate the aerodynamic drag reduction obtained by computational approach. The results show that the application of a suction in the rear part of the van model give the effect of reducing the wake and the vortex formation. Futhermore, aerodynamic drag reduction close to 13.86% for the computational approach and 16.32% for the experimental have been obtained.
THE INFLUENCE OF FROTHER IN FLOTATION USING ELECTROLYSIS FOR BATIK DYEING WASTE SEPARATION Nurrohman, Nurrohman; Warjito, Warjito
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 2 No. 1 (2016)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (518.947 KB) | DOI: 10.32832/ame.v2i1.350

Abstract

Batik waste can increase water characteristics such as turbidity, color and Total Suspended Solid (TSS). A technique for separating Batik from the liquid so that its turbidity, color and TSS decrease is needed. Flotation studies have been conducted using electrolysis to produce the bubbles to separate waste synthetic dye staining result of Batik from the bulk liquid. Research carried out by electrolysis with 316L stainless steel electrodes, inside an acrylic pipe with a height of 100 cm, and 8,4 cm in diameter with a voltage 15 V. Solid aluminum sulfate as a reagent was added to coagulate Batik waste as much as 1 gram per 10 ml of Batik waste. Batik waste was mixed with distilled water beforehand. Frother used was pure ethanol as much as 0.1% v/v. From the research it was discovered that flotation of Batik waste can be used for Batik waste separation with the addition of alum. Alum was proved capable of acting as collector in this type of waste separation. Ethanol as frother used was proved capable of making stable froth and increases the separation efficiency.
FAKTOR-FAKTOR YANG MEMENGARUHI PRODUKSI USAHA TANI BAWANG MERAH DI DESA BARENG KECAMATAN SEKAR KABUPATEN BOJONEGORO Warjito, Warjito; Kustanti, Asihing; Syafrial, Syafrial
Agros Journal of Agriculture Science Vol 26, No 2 (2024): Edisi Juli
Publisher : Fakultas Pertanian, Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v26i2.4730

Abstract

Mastery of Information and Communication Technology (ICT) has a significant role in developing the agricultural sector, especially in increasing efficiency and productivity. This research aims to investigate the influence of ICT mastery on shallot farming in Bareng Village, Bojonegoro Regency. Through a quantitative approach and collecting primary and secondary data from 93 respondents, multiple regression analysis shows that mastery of ICT makes a positive and significant contribution to agricultural development. Apart from that, factors such as the amount of fertilizer and type of seed also influence production. This study highlights the importance of integrating ICT in agricultural practices to increase efficiency, optimize production and strengthen the competitiveness of agricultural products in the global market. The results of this research provide important insights for policy makers, farmers and other stakeholders in understanding the role of ICT in facing challenges and exploiting opportunities in agricultural development.
Co-Authors Asihing Kustanti Budiarso Budiarso, Budiarso Engkos Achmad Kosasih Engkos Kosasih Harinaldi . I Gusti Made Teryanto, I Gusti Made Lay Teryanto, I Gusti Made Fredy Nurrohman Nurrohman Rustan Tarakka Sabar Pangihutan Simanungkalit Sabar Simanungkalit, Sabar Syafrial Syafrial