Judul: Analisis Pembentukan Portofolio Optimal Dengan Model Indeks Tunggal Dan Model Black-Litterman: Studi Kasus Indeks Idx30
Abstrak: Penelitian Ini Dilakukan Untuk Membentuk Portofolio Optimal Berdasarkan Model Indeks Tunggal Dan Model Black-Litterman Yang Kemudian Akan Dibandingkan Model Mana Yang Mempunyai Kinerja Lebih Baik Dengan Menggunakan Excess Return On Value At Risk. Model Indeks Tunggal Didasarkan Pada Pengamatan Bahwa Harga Saham Berfluktuasi Searah Dengan Indeks Harga Pasar Sedangkan Model Black-Litterman Didasarkan Bahwa Pandangan Investor Dapat Dikombinasikan Dengan Data Historis Harga Saham Untuk Membentuk Portofolio Optimal. Penelitian Ini Menggunakan Data Sekunder Periode Januari 2014–Januari 2015 Dari Saham-Saham Yang Termasuk Dalam Indeks Idx30 Periode Agustus 2014-Januari 2015. Dari Kedua Model Tersebut, Yang Dihasilkan Oleh Model Indeks Tunggal Memiliki Nilai Yang Lebih Tinggi Dibandingkan Dengan Nilai Yang Dihasilkan Model Black-Litterman Sehingga Portofolio Optimal Dengan Model Indeks Tunggal Memiliki Kinerja Yang Lebih Baik.
Keyword: Excess Return On Value At Risk, Indeks Idx30, Model Black Litterman, Model Indeks Tunggal, Portofolio Optimal

Judul: Analisis Pembentukan Portofolio Optimal dengan Model Markowitz dan Model Indeks Tunggal: Studi Kasus Indeks IDX30
Abstrak: This research in udertaken based on the act that the investment cannot be separated from the business world. The aim of this research is to identify the stocks that included in the IDX30 index that meet the criteria based on the formation of optimal porfolios from Markowitza Model and Single Index Model.
Keyword: Bogor Agricultural University (IPB), Optimal Portfolio, Markowitz Model, Single Index Model

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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