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Purwokerto, Indonesia

The Jenderal Soedirman University is a State University located in Purwokerto, Indonesia that was established on September 23, 1963. The university named after Jenderal Soedirman, the first commander-in-chief of the Indonesian Army during the country's fight for independence; he was born in the Banyumas region. The university rector is Prof. Edy Yuwono, PhD.UNSOED is the only State University in ex Banyumas residency. Thus affecting the student composition, from 25,782 of total active students in 2008, students from local Banyumas region accounted for almost 35% while the rest are from other regions in Indonesia as far as Sumatera and Sulawesi. About 5000 students enrolled at the university every year. Continuing development and improvement in education and student facilities and UNSOED's location in Purwokerto, a peaceful and cozy city, make it very suitable as a place for study, attracting more fresh high school graduates from all regions in Indonesia. The university also established a good reputation in the fields of Agriculture, Law, and Biology research and applied science.To improve overall services for the students, UNSOED provided many facilities and activities such as students economic union , scholarships, medical services and medical infrastructure, life insurance, libraries, laboratory, student learning center, student activity center, web-based academic information system, academic infrastructure , arts and sports organizations and dormitory. Wikipedia.

Sulaeman U.,Jenderal Soedirman University | Sulaeman U.,Tohoku University | Yin S.,Tohoku University | Sato T.,Tohoku University
Applied Catalysis B: Environmental

Chromium (Cr)-doped SrTiO3 nanoparticles were synthesized by a microwave-assisted solvothermal reaction using SrCl2·6H2O and Ti(OC3H7)4 as starting materials in KOH methanol-oleic acid solution. The products were characterized by XRD, TEM, BET surface area, and XPS. The photocatalytic activity was determined by DeNOx ability using LED lamps with wavelengths of 627nm (red), 530nm (green), 445nm (blue) and 390nm (UV). The nanoparticles of perovskite type Cr-doped SrTiO3 with a particle size of 15-20nm were successfully synthesized. The photocatalytic activity of SrTiO3 for DeNOx ability under visible light (627nm) irradiation was able to be improved by doping with a small amount of Cr. The high photocatalytic activity of Cr-doped SrTiO3 in the visible region was caused by new absorption in the visible region. © 2011 Elsevier B.V. Source

Meinita M.D.N.,Jenderal Soedirman University | Meinita M.D.N.,Pukyong National University | Hong Y.-K.,Pukyong National University | Jeong G.-T.,Pukyong National University
Bioprocess and Biosystems Engineering

Red seaweed, Kappaphycus alvarezii, holds great promise for use in biofuel production due to its high carbohydrate content. In this study, we investigated the effect of fermentation inhibitors to the K. alvarezii hydrolysate on cell growth and ethanol fermentation. In addition, detoxification of fermentation inhibitors was performed to decrease the fermentation inhibitory effect. 5-Hydroxymethylfurfural and levulinic acid, which are liberated from acidic hydrolysis, was also observed in the hydrolysate of K. alvarezii. These compounds inhibited ethanol fermentation. In order to remove these inhibitors, activated charcoal and calcium hydroxide were introduced. The efficiency of activated charcoals was examined and over-liming was used to remove the inhibitors. Activated charcoal was found to be more effective than calcium hydroxide to remove the inhibitors. Detoxification by activated charcoal strongly improved the fermentability of dilute acid hydrolysate in the production of bioethanol from K. alvarezii with Saccharomyces cerevisiae. The optimal detoxifying conditions were found to be below an activated charcoal concentration of 5%. © Springer-Verlag 2011. Source

Meinita M.D.N.,Jenderal Soedirman University | Meinita M.D.N.,Pukyong National University | Hong Y.-K.,Pukyong National University | Jeong G.-T.,Pukyong National University
Bioprocess and Biosystems Engineering

Abstract In this study, hydrolysis of marine algal biomass Kappaphhycus alvarezii using two different acid catalysts was examined with the goal of identifying optimal reaction conditions for the formation of sugars and byproducts. K. alvarezii were hydrolyzed by autoclave using sulfuric acid or hydrochloric acid as catalyst with different acid concentrations (0.1-1.0 M), substrate concentrations (1.0-13.5%), hydrolysis time (10-90 min) and hydrolysis temperatures (100-130 °C). A difference in galactose, glucose, reducing sugar and total sugar content was observed under the different hydrolysis conditions. Different by-product compounds such as 5-hydroxymethylfurfural and levulinic acid were also observed under the different reaction conditions. The optimal conditions for hydrolysis were achieved at a sulfuric acid concentration, temperature and reaction time of 0.2 M, 130 °C and 15 min, respectively. These results may provide useful information for the development of more efficient systems for biofuel production from marine biomass.© Springer-Verlag 2011. Source

Maryani S.,Jenderal Soedirman University
Mathematical Methods in the Applied Sciences

In this paper, we prove the global well-posedness of non-Newtonian viscous fluid flow of the Oldroyd-B model with free surface in a bounded domain of N-dimensional Euclidean space RN(N≥2). The assumption of the problem is that the initial data are small enough and orthogonal to rigid motions. © 2015 John Wiley & Sons, Ltd. Source

Suroso,Jenderal Soedirman University | Noguchi T.,University of Shizuoka
Energy Conversion and Management

This paper presents a novel topology of a three-level current-source PWM inverter totally driven by using single gate-drive power supply used for a grid connected inverter. The great feature of the proposed inverter circuit is that all of the power switches are connected on common-source or common-emitter configuration. Using this common-source current-source inverter (CS-CSI) the number of gate-drive power supply can dramatically be reduced into only a single power source without using bootstrap technique or many isolated power supplies. Operation of the proposed new inverter was tested by using computer simulation and experimentally. The simulation and experimental results proved that the inverter works properly generate a three-level output current waveform and inject a sinusoidal current into power grid with unity power factor operation. During grid connected operation, almost all harmonic orders are suppressed by using an additional harmonic suppression technique. © 2010 Elsevier Ltd. All rights reserved. Source

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