Judul: Sintesis Hidroksiapatit dari Cangkang Kerang Hijau dengan Metode Double Stirring Simultan
Abstrak: This research has been done on the syntthesis of hydroxyapatite using double stirring simultant method and stired with time and sintering temperatures variations. In this study the materials used as sources of calcium were green shellsand diammonium hydrogen phosphate as sources of phosphate. The synthesis results were characterizedusingX-ray Diffraction, Scanning Electron Microscope dan Particle Size Analizer. XRD characterizations resultedthat Hap was no longer 100% pure. Crystal size results varied between 10,50-26,65 nm. Precise lattice parameter was formed in almost all samples above 90%. The morphology using SEM resultedthat the crystallines formed particles, hence the PSA characterizationresulted greater suze than the size of crystalline using XRD. The higher the sintering temperature used, the larger the particle size formed, but the longer time used for stirring, the smaller the particles formed
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Judul: Sintesis dan Pencirian Hidroksiapatit dari Limbah Cangkang Kerang Hijau dengan Metode Kering
Abstrak: Hydroxyapatite (HAp) is a calcium phosphate biomaterial utilized in medicine as bone implant and dental fillings. HAp has been synthesized from green mussel shells with dry method. Calcination of green mussel shells at 1100 oC for 18 hours produced CaO with 97.83% crystallinity. Contact of CaO with the air for a night produced Ca(OH)2 with 85.45% crystallinity. Heating of CaO and Ca(OH)2 as the starting materials at 900 and 1100 °C for 2 hours produced HAp as characterized by using X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectrophotometer, and scanning electron microscope (SEM). The best HAp result was obtained from CaO material. The XRD diffractogram showed the formation of HAp phase accompanied by other calcium phosphate phase at 2θ angles matched with Joint Crystal Powder Diffraction Standard data. The FTIR spectra showed the presence of PO4 3– and OH– groups of the HAp and the SEM picture showed homogenous HAp crystal granule size. With additional treatments, the HAp pore size can be adjusted to be applied as bone implant or dental fillings.
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Judul: Pengembangan distribusi ILOS multimedia (ILOSmedia)
Abstrak: The development of open source softwares is still going rapidly nowadays, including open source operating systems for desktop computer, netbook, tablet PC, and smartphone. The open source operating systems have considerable contribution to open source software. Linux is an open source operating system that continues to grow since 1991. The characteristics in general Linux are free, can be distributed freely, and free to make changes in it. Linux in its development is divided into several distributions. Each distribution is made as a specific goal so that the operating system can focus on running the desired functions, such as multimedia, networking, education, etc. The objective of of this research is to develop and evaluate the ILOS distribution for multimedia by providing multimedia of open source packages. ILOSmedia uses Ubuntu10.10 and Remastersys as a tool to remaster. ILOSmedia is developed by installing multimedia packages that have been obtained based on the results of questionnaires from 30 respondents from three communities, which are KPLI Bogor, Linux.com forums, and Kaskus.us forums. ILOSmedia also uses the Realtime kernel as kernal Mutimedia. ILOSmedia testing is performed by 11 students of Computer Science who are members of FOKERZ community. The testing process is performed by executing ILOSmedia via live-cd and filled in a questionnaire. The test result shows that ILOSmedia has hardware compatibility on notebook and PC with good performance. As much as 72.727% of respondents believe that the size of the installer ILOSmedia of 1.34 GB and a minimum 10GB hard drive is normal. ILOSmedia has multimedia packages complete with the percentage completeness according to respondents is 45.455% are very complete and 54.545% are complete. Boot speed ILOSmedia have an average of 28.87 seconds and 90.91% of respondents consider that ILOSmedia have a desktop environment that is easy navigation
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