Judul: Sintesis dan Karakterisasi Octacalcium phosphate berbasis Cangkang Kerang Darah (Anadara granosa Linn.) dengan Variasi Molaritas dan Suhu Sintering.
Abstrak: Octacalcium phosphate (OCP) adalah biomaterial pengganti tulang dan gigi yang memiliki sifat biodegradable dan biocompatible yang tinggi. Sintesis OCP menggunakan cangkang kerang darah sebagai sumber kalsium dan H3PO4 sebagai sumber fosfat. Cangkang kerang hasil kalsinasi pada suhu 900 C selama 8 jam adalah murni CaO .Hasil uji AAS diperoleh kandungan Ca sebesar 66.41%. OCP disintesis dengan meneteskan larutan H3PO4 kedalam suspense CaO dengan variasi molaritas dan suhu sintering. Variasi molaritas Ca/P yang digunakan adalah [0.6]/[0.45], [1.2]/[0.9], dan [2.4]/[1.8] sedangkan varisi suhu sintering adalah 700 C, 800 C, 900 C, dan 1000 C. Identifikasi senyawa yang dihasilkan dianalisis menggunakan x-ray diffraction dan fourier transform infrared. Hasil pola difraksi sinar-X dan spektra FTIR menunjukan bahwa OCP terbanyak terbentuk pada molaritas Ca/P [2.4]/[1.8] dengan suhu sintering 900 C.
Keyword: fourier transform infrared, octacalcium phosphate, x-ray diffraction

Judul: Sintesis dan Karakterisasi Hidroksiapatit Berpori dari Cangkang Kerang Darah (Anadara granosa Linn.) dengan Porogen Lilin Lebah
Abstrak: Calcium phosphate compound is ceramic material that is used as good biomaterial for bones because of its bioactive and good biocompatibility which the composition is same as pure bone. The most stable calcium phosphate compound is hydroxyapatite (HAp) (Ca10(PO4)6OH2). But HAp has low dissolving level, thus porous HAp was made. HAp was synthesized by sol gel methods with main calcium material was provided by Cockle (A. granosa ) and as the porous agent was used beeswax dissolved by ethanol 96%. This research was done by 5 difference concentrations of beeswax, i.e. 10%, 20%, 30%, 40%, and 50%. Synthesis result was analyzed with X-ray diffractometer, scanning electron microscopy, and Fourier transform infrared. The result from X-ray diffractometer analysis showed the best porous HAp in this research used 30% beeswax as porous agent. Scanning microscopy electron analysis result showed big porous formed by using 50% beeswax with average macro porous size was about 1,74 μm and average micro porous size was about 0,245 μm . Calcium phosphate compound was sintered on the temperature 900o C for 5 hours.
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Judul: Zero-inflated negative binomial models in small area estimation.
Abstrak: The problem of over-dispersion in Poisson data is usually solved by introducing prior distributions which lead to negative binomial models. Poisson data sometime is also suffered by excess zero problems, a condition when data contains too many zero or exceeds the distribution's expectation. Zero Inflated Negative Binomial (ZINB) method can be utilized to solve such problems. This paper demonstrates the adaption of ZINB methods in Small Area Estimation with excess zero data. It is shown that the excess zero problem has substantially influenced the Empirical Bayes (EB) estimates, and the adaption of ZINB methods has improved the precision and reliability of the estimates. Key Words: Small Area Estimation, Zero-Inflation, Poisson-Gamma, Negative Binomial Regression, Empirical Bayes
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