Judul: Faktor-Faktor yang Memengaruhi Volatilitas Return Jakarta Islamic Index dan Indeks Harga Saham Gabungan Indonesia
Abstrak: Investasi di pasar modal memiliki daya tarik tersendiri bagi investor karena memberikan return yang lebih tinggi dibandingkan menabung di bank. Instrumen investasi yang paling besar memberikan return adalah saham, namun saham juga memiliki risiko tinggi. Risiko pada pasar saham dapat digambarkan melalui pergerakan atau volatilitas return indeks saham. Penelitian ini menggunakan metode ARCH/GARCH, uji beda dan Error Correction Model untuk mengetahui faktor yang memengaruhi volatilitas. Hasil penelitian menunjukan volatilitas return Jakarta Islamic Index (JII) dan Indeks Harga Saham Gabungan (IHSG) memiliki pergerakan yang sama, namun JII memiliki volatilitas lebih tinggi. Kurs berpengaruh signifikan terhadap volatilitas return JII dan IHSG dalam jangka pendek dan panjang. Oil price berpengaruh signifikan pada jangka panjang. FFR berpengaruh signifikan terhadap volatilitas return JII pada jangka pendek dan panjang, sedangkan volatilitas return IHSG hanya berpengaruh pada jangka panjang. Regulasi saham syariah tidak berpengaruh signifikan namun regulasi membuat rata-rata dan error pada volatilitas return JII dan IHSG menurun.
Keyword: volatilitas, ARCH/GARCH, Error Correction Model

Judul: The impact of global financial crisis, world oil price changes and return volatility from global indices to sharia and conventional index in indonesia
Abstrak: Penelitian ini bertujuan untuk menganalisis volatilitas return indeks saham syariah (res_JII) dan konvensional (res_JCI) di Indonesia serta menganalisis dampak krisis keuangan global, perubahan harga minyak dunia dan volatilitas return indeks saham global terhadap volatilitas return indeks saham syariah (res_JII) dan konvensional (res_JII) di Indonesia. Data yang digunakan dalam penelitian ini adalah data harian harga minyak dunia dan indeks saham dari India, Jerman, Hong Kong, Jepang, Australia, Amerika Serikat, Singapura dan Indonesia mulai 1 Agustus 2007 sampai 31 Desember 2013. Metode analisis yang digunakan adalah kombinasi dari GARCH dan VAR. Hasil yang diperoleh adalah: (1) volatilitas return JII lebih tinggi dibanding volatilitas return JCI, tetapi pergerakan volatilitas return kedua indeks tersebut sama. (2) Guncangan krisis keuangan global lebih memberikan pengaruh yang besar terhadap volatilitas return JII dibanding volatilitas return JCI. Namun, baik volatilitas return JII maupun JCI lebih dipengaruhi oleh dirinya sendiri dan volatilitas return dari indeks saham Amerika Serikat, sedangkan perubahan harga minyak dunia tidak memberikan pengaruh yang besar terhadap volatilitas return kedua indeks saham tersebut., The objectives of this research are to analyze the return volatility from sharia (res_JII) and conventional index (res_JCI) and analyze the impact of global financial crisis, world oil price changes and return volatility from global indices to Sharia and Conventional Stock Index Return Volatility in Indonesia. This researh utilize the daily world oil price and the stock price indices from India, Germany, Hong Kong, Japan, Australia,United States, Singapore and Indonesia from August 1st2007 to December 31th 2013. The data analysis method utilize combination GARCH and VAR. The result show that: (1) JII has a higher return volatility than JCI. But, return volatility in JII and JCI have a similar movement. (2) The shock from global financial market give much effect to JII return volatility than JCI return volatility. But, the the both of JII return volatility and JCI return volatility are effected by themselves and and return volatility from United States, whereas the stock price changes don‟t give much effect to the both of stock return volatility.
Keyword: ARCH/GARCH, indeks konvensional, indeks syariah, krisis keuangan global, perubahan harga minyak dunia, volatilitas return indeks, VAR

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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