Sultan Ageng Tirtayasa University
Serang, Indonesia

Sultan Ageng Tirtayasa University is the only state university in the province of Banten, Indonesia. The main campus is in Serang and the faculty of engineering is at Cilegon. Sultan Ageng Tirtayasa University was established by the Tirtayasa Foundation.Untirta has six faculties: Law, Teacher Training and Education , Engineering, Agriculture, Economics, and Social and Political Science.Sultan Ageng Tirtayasa University is the youngest in Indonesia, which is located in the province of Banten. Wikipedia.

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Suherman,Sultan Ageng Tirtayasa University | Wibowo F.C.,Sultan Ageng Tirtayasa University
Advanced Science Letters | Year: 2017

The aim of this study is to Development an integrated skills, humanist, mental (SHM) for professional teacher preparation programmer. The average teacher in Indonesia when asked whether it is professional, surely the answer is already a professional. However, in reality in Indonesia they are a competent teacher who asked but when seen from the results of teacher evaluation in the low category. So that model proposed SHM Model articulated, in broad terms, the Skills, Humanist, and Mental components for beginning teachers’, with the underlying core values permeating the programmer. The method of study uses one group experiment for development as well as the characteristic of SHM and total samples of research is 50 teachers. The result is model of SHM significant for development of professionalism teachers. © 2017 American Scientific Publishers All rights reserved.

Alfirano,Sultan Ageng Tirtayasa University
Materials Science Forum | Year: 2016

Pin-on-disk wear test using Co-Cr-Mo-C-N-Si-Mn cast alloy pins and alumina disks was conducted in Kokubo and 1mass% lactic acid solutions. The precipitates in the as-cast alloys were M23X6 type, π-phase and M2X type. After wear test, it was found that the ratio of the amount of eluted ions in 1mass% lactic acid solution corresponded to the chemical composition of alloys. The detached of M2X type precipitate was observed in as-cast alloy after wear test in 1mass% lactic acid solution. Meanwhile, the elution of metallic ions in Kokubo solution was much less that in 1mass% lactic acid solution. Concentration of Cr was extremely low in Kokubo solution. The formation of CrOOH during test in Kokubo solution might suppress the concentration of Cr. © 2016 Trans Tech Publications, Switzerland.

Syaichurrozi I.,Sultan Ageng Tirtayasa University
Renewable Energy | Year: 2018

The biogas fermentation co-digestion Salvinia molesta (SM) and rice straw (RS) was investigated within a wide range of SM:RS of 100:0–0:100 (mass ratio). This study used batch anaerobic digesters in laboratory-scale operated at mesophilic temperature in 30 days. The optimum SM:RS ratio was 60:40–0:100 (C/N of 29.50–39.17) producing total biogas yield of 103.83–113.92 mL/g VS. The highest biogas yield (113.92 ± 6.90 mL/g VS) was obtained from SM:RS of 40:60 (C/N of 34.80). The biogas produced from SM:RS of 40:60 contained 60.58% CH4, 38.69% CO2, 0.73% H2. Fitting error between measured and predicted total biogas yield for 30 days fermentation by using modified Gompertz, Cone, First Order model was 0.96–6.45%, 0.14–3.52%, and 1.97–15.25% respectively. Furthermore, Cone model was used to design the anaerobic batch digester volume and develop the kinetic model of VS degradability rate. The fit correlation of measured and predicted VS removal was R2 = 0.992. © 2017 Elsevier Ltd

Zulaida Y.M.,Sultan Ageng Tirtayasa University | Suryana,Sultan Ageng Tirtayasa University
AIP Conference Proceedings | Year: 2016

Macrosegregation is indentified through the differences in the composition of the solid composition to the nominal composition in relative large distance in casting. Macrosegregation can be caused by fluid flow or solid movement that induced convection due to the density differences in liquid during solidification. The difference temperature and composition in liquid can cause the density differences. In this present study wants to observe the effect of solute composition in binary alloy on the macrosegregation formation. Low melt temperature material, Bi-Sn alloy, is used as a material model. Three compositions of Binary alloy include solid solution, eutectic and hypereutectic are used to represent the different composition from the different solidification condition. The three are applied to observe the effect solute composition on macrosegregation formation and dendrite structure. The result show that In eutectic composition, Sn-rich dendrite structure form in upper side until some parts of the edge side of casting. In hypereutectic composition, Primary Bi is gathering in the bottom of the casting show that there is a possibility of solid movement and convection through sedimentation primary phase. © 2016 Author(s).

Hartono,Sultan Ageng Tirtayasa University | Kuo M.-T.,National Taiwan University of Science and Technology
AIP Conference Proceedings | Year: 2017

If the power system falls into an unsteady state, there will be voltage collapse in which the power system will be separated into small systems. Identifying the stability reserve in conformity with a certain practical operation condition is very important for the system management and operation. In fact, the global power system issue has caused serious outages due to voltage collapse such as in the United States-Canada in August 14, 2003; South London in August 28, 2003; southern Sweden and eastern Denmark in September 23, 2003; and Italy on September 28, 2003, and in Vietnam where power system problem led to power loss on 17 May 2005, 27 December 2006, 20 July 2007, and 10 September 2007. The analysis shows that the phenomenon is related to the loss of system stability. Thus, the operational system as well as the power system designs should be studied related to the issue of the system stability. To study the static stability of the power system, different approximate standards, called pragmatic criteria, were examined. Markovits has investigated the application of the standard of dP/dd to test the stability of the power button and dq/dU to check the voltage stability of the load button [1]. However, the storage stability when calculating standard dP/d d is usually much larger than the reserves when calculating standard dq/dU [1]. This paper presents a method to build a possible operation region in the power plane of load bus which works in comply with the stability limit to evaluate the stability reserve of the power system. This method is used to build a program to monitor the stability reserve of IEEE 39 Bus Power System in real time. To monitor the stability reserve of IEEE 39 nodes power system, articles based on the standard dq/dU was used to calculate the assessment. When using standard dq/dU to check for voltage stability load button, the amount of storage stability can be calculated by the following steps: first, transformed replacement scheme Masonry on the schematic rays of the source and node load stability was examined by using Gaussian elimination algorithm [1, 2, 3], then on the basis of ray diagrams the construction work, allowed domain of spare capacity load capacity in space and storage stability for the load button were determined. The GS-ODT program was built on the basis of Gaussian elimination algorithm and stable domain construction work algorithm for Masonic load button by dQ/dU pragmatic criteria. The GS-ODT program has a simple interface and easy to use with the main function is to identify the allowed domain for the load button and thus can assess visually stable reserve still according to the load capacity of the nodes of the IEEE 39 nodes power system in real-time. © 2017 Author(s).

Effendy M.,State University of Surabaya | Wardhono E.Y.,Sultan Ageng Tirtayasa University
MATEC Web of Conferences | Year: 2016

The catalytic oxidation of methane for abating the emission vented from coal mine or natural gas transportation has been known as most reliable method. A reverse flow reactor operation has been widely used to oxidize this methane emission due to its capability for autothermal operation and heat production. The design of the reverse flow reactor requires a proper kinetic rate expression, which should be developed based on the operating condition. The kinetic rate obtained in the steady state condition cannot be applied for designing the reactor operated under unsteady state condition. Therefore, new approach to develop the dynamic kinetic rate expression becomes indispensable, particularly for periodic operation such as reverse flow reactor. This paper presents a novel method to develop the kinetic rate expression applied for unsteady state operation. The model reaction of the catalytic methane oxidation over Pt/-Al2O3 catalyst was used with kinetic parameter determined from laboratory experiments. The reactor used was a fixed bed, once-through operation, with a composition modulation in the feed gas. The switching time was set at 3 min by varying the feed concentration, feed flow rate, and reaction temperature. The concentrations of methane in the feed and product were measured and analysed using gas chromatography. The steady state condition for obtaining the kinetic rate expression was taken as a base case and as a way to judge its appropriateness to be applied for dynamic system. A Langmuir-Hinshelwood reaction rate model was developed. The time period during one cycle was divided into some segments, depending on the ratio of CH4/O2. The experimental result shows that there were kinetic regimes occur during one cycle: kinetic regime controlled by intrinsic surface reaction and kinetic regime controlled by external diffusion. The kinetic rate obtained in the steady state operation was not appropriate when applied for unsteady state operation. On the other hand, the kinetic rate expression obtained in the unsteady state operation fitted quite well. It was proven that in one cycle period the kinetic rate would always shift according to the ratio of CH4/O2. © Owned by the authors, published by EDP Sciences, 2016.

Sholehah A.,University of Indonesia | Sholehah A.,Sultan Ageng Tirtayasa University | Yuwono A.H.,University of Indonesia | Rimbani C.R.,Sultan Ageng Tirtayasa University
Materials Science Forum | Year: 2013

ZnO nanorods were deposited on ITO glass substrate via chemical bath deposition at low temperature of 90°C. The seeding solution was made by dissolving zinc nitrate tetrahydrate and methenamine in cool water (5°C). The as-synthesized ZnOs were further subjected to posthydrothermal treatment series. The results of scanning electron microscope (SEM) studies showed that the ZnO nanorods were grown as vertically-aligned hexagonal structure, while x-ray diffraction (XRD) patterns showed a high intensity of [002] peak. The absorption spectra of the as-synthesized sample indicated a strong absorption peak near the UV region. After post-hydrothermal treatments, the absorption was slightly shifted to visible region. The ZnO nanorods sample derived from posthydrothermal treatment at 150°C for 12 hours has the largest crystallite size of 269.402 nm and the lowest band gap energy, Eg value of 3.205 eV.© (2013) Trans Tech Publications, Switzerland.

Wibisono G.,University of Indonesia | Firmansyah T.,Sultan Ageng Tirtayasa University
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2012

In this paper, multiband low noise amplifier (LNA) with multi-section impedance transformer (MIT) as impedance matching is designed, fabricated and evaluated. MIT is used as input and output impedance matching because MIT has higher stability, large Q factor, and low noise than lumped component. MIT is easy to fabricate and measure. The aim of the research is to design multiband LNA with MIT at center frequencies located at 0.95 GHz for GSM, 1.85 GHz for WCDMA and 2.65 GHz for LTE. Designed and evaluated of the proposed multiband LNA with MIT is done by using advanced desain system (ADS). It shown from the simulated results that performances of the proposed LNA at center frequency of 0.950 GHz has return loss, S11 = -23.541 dB, insertion loss, S 21 = 18.911 dB, noise figure, NF = 1.475 dB, VSWR = 1.143, and FoM = 8.38, respectively. At center frequency of 1.85 GHz, the proposed LNA has S 11 = -23.771 dB, S21 = 12.858 dB, NF = 1.988 dB, VSWR = 1.139, and FoM = 2.616. At center frequency 2.65 GHz, the proposed LNA has S11 = -23.521 dB, S21 = 10.180 dB, NF = 2.776 dB, VSWR = 1.143, and FoM = 1.152. The center frequencies of fabricated proposed multiband LNA with MIT are shifted in average to 5-10 MHz lead to simulation results, and the performances of the fabricated of the proposed LNA with MIT are degraded about 7-10% by using Monte-Carlo Yield Analysis. © 2012 IEEE.

This research aim to know: (1) how much the influence the three the factors of productions to yield product, (2) efficiency of using raw material, fuel, and labor. A Survey was applied in this study. The population consisted of melinjo chips producers in Menes. A Sample was sorted out trough stratified random sampling. The sample consisted of 32 producers. With respect to its raw material used, 11 producers more similar to 15 kg and the others, 21 producers produced less than 15 kg. Cobb-Douglas production function and efficiency analysis were applied. The results of this study indicated that Simultaneously melinjo chips production is influenced by melinjo seed (raw material), fuel and labor. Partially melinjo seed (raw material) and fuel significant effect on the production of melinjo chips, and significant experiences tapped to melinjo chips production, While labor did not significantly affect the production of melinjo chips. © 2016, Research India Publications.

Putra A.N.,Sultan Ageng Tirtayasa University
Research Journal of Microbiology | Year: 2015

The present study was aimed to obtain amylolytic bacteria probiotic to improve feed digestibility and growth performance in tilapia. All of the bacteria were isolated from the digestive tract of tilapia. The probiotic bacteria candidates were screened for amylolytic activity, bacterial growth rate, the resistance to acid and alkali, antagonistic activity, attachment and pathogenicity in tilapia. The selected isolates were then tested in vivo to observe their ability to improve feed digestibility and growth performance in tilapia. Two treatments with four replicates consisted of the control (without any probiotic) (A) and the probiotic (B) at a dose of 1% v/w feed were administered every day for 60 days. There were 41 isolates which secreted amylase and the five isolates with the largest diameter of the clear zone were NB1, NB2, NB3, NB4 and NB5. Isolate NP5 demonstrated the best results: It had amylolytic activity with a clear zone diameter of 20.3 cm, it grew rapidly with a generation time of 33.59 min, it had antagonistic properties against the pathogenic bacteria Aeromonas hydrophila and Streptococcus sp., with the inhibition zones of 12.0 and 11.0 cm, respectively. It had the ability to adhere to stainless steel plates and it was not pathogenic to tilapia. The feeding trial in tilapia showed that the probiotic treatment resulted in better feed digestibility and growth performance than those of the control. © 2015 Academic journals Inc.

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