Purwokerto, Indonesia

Jenderal Soedirman University

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.

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Sugiyanto G.,Jenderal Soedirman University
Journal of Engineering and Applied Sciences | Year: 2016

The increases of car ownership, population growth and urbanization have increased traffic congestion in many cities in the world. One of the alternatives to reduce congestion is application of congestion pricing. The aim of this research is to estimate the congestion cost of motorcycles and the impact of congestion pricing scheme on the generalized cost and speed of motorcycle to the city of Yogyakarta, Indonesia. The amount of the congestion pricing is the difference between generalized cost in free-flow speed and actual generalized cost in traffic jam condition. In this study, generalized costs of motorcycle from origin zone i to destination zone j consists of vehicle operating cost and travel time cost. This study shows that while the free-flow speed of motorcycle to the city of Yogyakarta is 45.45 km h-1 bring on the generalized cost is IDR774 per trip, the actual speed in traffic jam condition is 12.57 km h-1 produce the generalized cost is IDR1655 per trip, giving the congestion pricing of motorcycle to the city of Yogyakarta is IDR881 per trip. The impact of application of congestion pricing for motorcycles users will increase the vehicle speeds between 0.42-6.32% and decreases the generalized cost. Speed of vehicle will increase as 1.76 kmh-1 in Malioboro Street. The amount of generalized cost of motorcycles will decrease IDR36 per trip (3.63%). © Medwell Journals, 2016.

Ngadiman,Jenderal Soedirman University
IOP Conference Series: Materials Science and Engineering | Year: 2017

The purpose of this research is to evaluate the Kids Athletic massing program in Banyumas Central of Java. The research uses both qualitative and quantitative approach (mixed methods). CIPP evaluation model of Stufflebeam is used to evaluate the context, input, process, and outcome. Samples are taken using purposive and cluster sampling technique. The result showed that in the context evaluation scored 0.73, the input evaluation scored 0.71, the process evaluation scored 0.73, and the product evaluation scored 0.68. The conclusion are the aspect of context, input, and process, the programs are classified into good category. Meanwhile, the aspect of output, those are classified into fair category. © Published under licence by IOP Publishing Ltd.

Sulaeman U.,Jenderal Soedirman University | Zuhairi Abdullah A.,Universiti Sains Malaysia
Renewable and Sustainable Energy Reviews | Year: 2017

The power conversion efficiency (PCE) of TiO2-based dye-sensitized solar cells (DSSCs) could be enhanced by modification of photoanodes. The effective blocking layer addition, one-dimensional nanostructure architecture, and scattering material design are the most important approaches to provide the high PCE of DSSCs and are critically reviewed in this work. The blocking layer generated the energy barrier can suppress the recombination of an electron in photoanode. One-dimensional (1D) nanostructures of a nanorod, nanotube and nanowire, promote the enhanced electron transport of DSSCs. The PCE of 1D nanostructure based DSSCs can potentially be improved by incorporating high surface area TiO2 nanoparticles and constructing the multilayered 1D nanostructure arrays photoanodes. The scattering effect can be generated by mesoporous, core-shell and yolk-shell materials with the sizes architecture corresponding to the wavelength of incident light, enhancing the light harvesting. The high efficiency of TiO2-based photoanodes could be realized by optimizing the composition, size of materials, and thickness of photoanodes. © 2017 Elsevier Ltd

Maryoto A.,Jenderal Soedirman University
Procedia Engineering | Year: 2017

Water tightness of concrete is usually specified by how much water penetrates or infiltrates into concrete. This indication is applied to detect the possibility of corrosion attack due to aggressive ions such as chloride into reinforced concrete. Since the corrosion occurs on the steel bar of concrete, corrosion level is another methods to express impermeability of concrete. Unfortunately, corrosion process due to chloride attack in the real environment needs several decades. One of the methods which is used to measure corrosion process rapidly is an accelerated corrosion test. This study investigates water tightness and corrosion resistance due to chloride ion in the concrete with calcium stearate by using absorption and electrolytic corrosion test. Two types of concrete mixture i.e. CS-0 and CS-1 are considered in the experiment. Each type of concrete mixture comprises three groups of testing, which are compressive strength, absorption, and electrolytic corrosion test. The dimension of the specimen for compressive strength is 100 mm of diameter and 200 mm in height, and for absorption is 75 mm of diameter and 150 mm in height. Meanwhile, dimension of the electrolytic corrosion specimen is a cube with a size of 100 cm x 100 cm x 200 mm. The result shows that concrete with calcium stearate 1 kg per cubic meter of concrete has a better water tightness property than concrete without calcium stearate. Furthermore, the tendency is also being supported by corrosion resistance result. It can be observed that concrete with calcium stearate is also more resistant to corrosion attack. © 2017 The Authors.

Waluyo S.,Jenderal Soedirman University
Structural Engineering and Mechanics | Year: 2017

This work presents a new strategy to model stress dependent relaxation process in large deformation. The strategy is relied on the fact that in some particular soft materials undergoing large deformation, e.g., elastomers, rubbers and soft tissues, the relaxation time depends strongly on stress levels. To simplify the viscoelastic model, we consider that the relaxation time is the function of previous elastic deviatoric stress state experienced by materials during loading. Using the General Maxwell Model (GMM), we simulate numerically conditions with the constant and the stress dependent relaxation time for uniaxial tension and compression loading. Hence, it can be shown that the proposed model herein not only can represent different relaxation time for different stress level but also maintain the capability of the GMM to model hysteresis phenomena. Copyright © 2017 Techno-Press, Ltd.

Sugiyanto G.,Jenderal Soedirman University
Engineering Journal | Year: 2017

Scrapped tire rubbers have been proposed as flexible pavement components because they are waste materials. Sustainable development of flexible pavement by utilizing waste tire rubber to replace natural resources generates positive impact to the nature and reducing environmental pollution. This paper presents a study on the investigation of waste scrapped tire rubber as fine aggregate in the production of Asphalt Concrete (AC) mixture. There are three type of AC mixture with 0%, 50%, and 100% of waste scrapped tire rubber replacement of aggregate at fraction No. 50 (0.279 mm). Laboratory test is performed on six characteristics of Marshall test are void in mineral aggregate, void in mixture, voids filled with bitumen, stability, flow, and Marshall quotient. The results showed that the optimum asphalt content for ACStandard mixture is 6.78%, while ACScrapped-tire 50% mixture is 7.10% and ACScrapped-tire 100% mixture is 6.22%. Based on the Marshall Test characteristics, scrapped tire rubber can be used as an alternative material to replace fine aggregate in AC mixtures for road surface layer. The use of scrapped tire rubber in asphalt concrete mixtures can improve the resistance to permanent deformation due to ruts and provide better resistance to high temperatures and loads. © 2017, Chulalongkorn University 1. All rights reserved.

Suroso,Jenderal Soedirman University | Noguchi T.,University of Shizuoka
Energy Conversion and Management | Year: 2010

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.

Suroso,Jenderal Soedirman University | Noguchi T.,University of Shizuoka
IET Power Electronics | Year: 2011

The study proposes a new circuit configuration of multilevel current-source inverter (CSI). In this new multilevel CSI topology, all power switching devices of the inverter are connected at a common-emitter point or at a common-potential line. Hence, all the power switches need only a single gate drive power supply without using isolated power supplies or conventional bootstrap techniques. This feature is still valid even if the number of the power switches increases owing to the higher-level number of the output current waveform. As a result, complexity of the gate drive circuit can be remarkably moderated. In addition, the multilevel CSI circuit is more capable to operate at high switching frequency if required, because all the power switches are connected at a common potential level. A five-level pulse width modulation inverter configuration, including chopper circuits as DC current-power source circuits using small smoothing inductors, is verified through computer simulations and experimental tests. The results show feasibility of the proposed multilevel inverter topology with reducing the complexity of the gate drive circuits, the inductor size, total harmonic distortion (TMD) of output current and increasing the efficiency of the multilevel CSI. © 2011 The Institution of Engineering and Technology.

Suroso,Jenderal Soedirman University | Suroso,Nagaoka University of Technology | Noguchi T.,University of Shizuoka
IEEE Transactions on Power Electronics | Year: 2012

This paper presents a new circuit configuration of single-phase multilevel current-source inverter (CSI). In this new topology, a basic H-bridge CSI working as a main inverter generates a multilevel current waveform in cooperation with inductor cells connected in parallel as auxiliary circuits. Each inductor cell is composed by four unidirectional power switches with an inductor across the cell circuit. The inductor cells work by generating the intermediate level of the multilevel current waveform with no additional external dc-power sources. A simple proportional-integral controller is applied to control the intermediate-level currents of the multilevel output waveform. A five-level and a nine-level pulsewidth-modulation inverter configuration, with chopper-based dc-current sources, are verified through computer simulations. Furthermore, an experimental prototype of a five-level CSI is set up and is tested. The results show that the test circuit works properly to generate the multilevel output-current waveform with low output harmonics by using small size of inductors without any additional external dc-power sources, which proves feasibility of the proposed strategy. © 2011 IEEE.

Tri Cahyanto W.,Jenderal Soedirman University
Advanced Materials Research | Year: 2014

Adsorption mechanism of carbon monoxide (CO) on PtRu and PtRuMo alloy surfaces is investigated by using a density functional theory (DFT). It includes evaluation of binding configuration and the adsorption strength. The results show that CO preferentially adsorbs onto the 3 fold hollow site of the PtRu- surface, while on the PtRuMo surface we observe the shift from the fcc hollow site to near the bridge site. We also note that adsorption energy of CO on the PtRuMo is stronger than that of adsorption on the PtRu surface. From the charge transfer analysis, we conclude that the stronger binding energy is caused by the more charge transferred to the surfaceadsorbate bonding region brought by alloying Mo to the PtRu. © (2014) Trans Tech Publications, Switzerland.

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