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Pebriadi P.,Siliwangi University | Wuryandari A.I.,Bandung Institute of Technology | Setijadi P.A.,Bandung Institute of Technology
Proceedings of the 2013 Joint International Conference on Rural Information and Communication Technology and Electric-Vehicle Technology, rICT and ICEV-T 2013 | Year: 2013

Unemployment is one of the major problems in the world, especially in Indonesia. According to the national statistics agency, the number of unemployed in Indonesia in 2010-2012 to reach 8 million people. The low ability of people in the field of web and the availability of qualified teachers and the availability of professional staff time, as well as the lack of developers who create e-learning, especially the use of touch screen technology. NET Framework 4.5 on windows8, is one cause. But in this era, there are opportunities and industry information technology content. In Indonesia, the content industry is growing rapidly, increasing by 50% from 2011 to 2012 because of high demand from the public. To overcome that, we need an education automation, collaboration and community-based environmental and information technology fields. All that can be overcome with the application-based e-learning that iCode. This application will allow users to learn HTML5 anywhere and anytime, even they do not deal directly with the teacher, as represented by the video tutorial. Features of e-learning in the iCode, which users can learn HTML5 programming language, practice the source code (coding) while watching the video tutorials, the user can perform a challenge to test their understanding and generate the best value, the user can connect with teachers and other users through social media facebook. The results obtained after the application iCode, there is an increase in learning and motivation to learn the language HTML5 users where users are playing games during a. © 2013 IEEE. Source

Aripin H.,Siliwangi University | Mitsudo S.,University of Fukui | Sudiana I.N.,Haluoleo University | Saito T.,University of Fukui | Sabchevski S.,Bulgarian Academy of Science
Transactions of the Indian Ceramic Society | Year: 2015

In the present study, double sintered nanocrystalline silica xerogel (NSX) bulk material has been produced from amorphous silica xerogel (ASX) powders extracted from sago waste ash. The ASX powders have been sintered at 1200°C, milled, pressed and then re-sintered at temperatures ranging from 1200° to 1600°C. The crystallization process of the NSX has been examined by thermal analysis (DSC/TGA) and X-ray diffraction (XRD), while the functional groups and the structure have been identified by infrared and Raman spectroscopy, respectively. From the DSC analysis it has been found that the tetragonal phase of α-cristobalite transforms to the stable phase of SiO2, namely cubic β-cristobalite in the samples re-sintered at 1600°C. This observation has been corroborated by an analysis of the XRD patterns, infrared and Raman spectra. The obtained data suggest that such novel material could be considered as an appropriate alternative for deposition of ceramic coatings on various machine and tool parts, e.g. components of gas-turbine engines. © 2015, © 2015 The Indian Ceramic Society. Source

Aripin H.,Siliwangi University | Mitsudo S.,University of Fukui | Prima E.S.,Haluoleo University | Sudiana I.N.,Haluoleo University | And 3 more authors.
Ceramics International | Year: 2015

In this study, we investigate mullite containing ceramics prepared from alumina (α-Al2O3) and silica xerogel converted from sago waste ash. The silica xerogel was ground and then mixed with a varying content of α-Al2O3. The measurements were performed on cylindrical samples sintered at temperatures ranging from 900 °C to 1700 °C. In order to understand the mullitization process and structure formation a series of analyses were carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, thermo-gravimetric analysis (TGA) and a differential scanning calorimetry (DSC). The results show that the mullite phase can be formed at a temperature as low as 1100 °C. It was found that a complete mullitization takes place for the composition of 40 mol% α-Al2O3 sintered at 1600 °C. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source

Suwardi I.S.,Bandung Institute of Technology | Aradea,Siliwangi University
ICAICTA 2015 - 2015 International Conference on Advanced Informatics: Concepts, Theory and Applications | Year: 2015

Self-adaptive system is a system that can take proper action automatically to reach its goal, based on the situation which occur at this system environment to meet satisfactory of its users. This paper would illustrate a case about self-adaptation function requirement in application tools that correspond to the requirement of graphic element adjustment function. One of the problems that can arise are related to connectivity function graphic elements, wherein when graphic elements associated with other graphic elements, elements of the relationship between the graphic elements can occupy the working area irregularly, even if there are other graphic elements that block the path relations, the relation element can penetrate into that graphic element. This condition has to rearrange by a user manually, so it is quite difficult and time consuming. Strategy that needed to overcome that problems, which must guarantee the availability of areas as working environment, as well as the appropriate decision-making mechanisms when determining an alternative option to connect between elements graphic automatically as self-adaptation ability. The solution for this problem, we propose strategy to automate relation space management of graphic element, as a result of an adaptation mechanism which more flexible and simplify users to do the job. Core concept that developed consist of two approaches namely free space management and neighbourhood modeling. These both concepts realised to polish up adaptation ability from tools limitation that exists at the current time. © 2015 IEEE. Source

Rahmat B.,Siliwangi University | Setiasih I.S.,Padjadjaran University | Kastaman R.,Padjadjaran University
Indonesian Journal of Chemistry | Year: 2012

This research was aimed to study the effect of glycerol separation on palm oil transesterification. Objectives of this study were to suppress the use of excess methanol and shorten the processing time. This research consisted of: design-build reactor, the effect of the glycerol separation on the transesterification reaction, characterization of biodiesel, and mass balance analysis. The reactor was designed by integrating circulate stirrer pump, static mixer, and sprayer that will bring out the intense reaction in the outer tank reactor. The experiment in this research was the treatment of decreasing the quantity of methanol to 5:1 molar ratio and reducing of processing time to 20 min, which was arranged in a completely randomized factorial design. The result showed that, (i) the stirring system was effectively worked outside the reactor tank, and in its reactor tank occurred glycerol separation during the process; (ii) the rate of glycerol during the process followed the inverse regression equation of Ŷ = 66.44-351.17 X-1; (iii) the decrease in the level of methanol to 5:1 molar ratio and the reduction of processing time to 20 min in this engineering did not influence the biodiesel yield and quality that met the SNI 04-7182-2006 standard. Source

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