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 Cangkang Kerang Hijau dengan Metode Sol-Gel
Abstrak: Hydroxyapatite (HAp) is a major component of bones and teeth. HAp is widely used to repair, fill, extend, and reconstruct damaged bone tissue. In this research, HAp has been synthesized from green mussel shell by using sol-gel method. The controlled synthesis parameter was pH, and the variable being compared was heating temperature at 900 and 1100 oC. The HAp products were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectrophotometer, and scanning electron microscope. The results showed that HAp was formed at alkaline pH. The XRD pattern showed that Hap was formed along with type A apatite carbonate, octacalcium phosphate, α- and β-tricalcium phosphate. The crystallinity was increased by raising the temperature and prolonging the heating time. The quality of HAp will get better with increasing crystallinity, and incrasing the temperature will raise the amount of HAp formed as well
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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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