Judul: Analisis Spasial untuk Sebaran Suara dan Perolehan Kursi Partai Politik pada Pemilu Legislatif 2009 di Wilayah DKI Jakarta dan Jawa Barat
Abstrak: In terms of election, voters behavior within a certain area varies widely and produces various responses of party preferences. This thing indicates that there is an influence of spatial on voters’ preferences besides other variables and factors innate in every individual. What is interesting is that in legislative contest, changes in districts as a spatial factor that can result in different vote accumulations that can impact different seat gain. Therefore there is a deterministic technical aspect to be emphasized which are the technical mechanism and regulations of district creation. This research used Local Indicator Spatial Association (LISA), statistical method based on Local Moran Index, to prove the influence of those two factors on the result of party votes and seats in the Election of 2009.
Keyword: 

Judul: Spatial Regression Analysis to Evaluate Indonesian Presidential General Election
Abstrak: Indonesia has held two presidential elections in 2004 and 2009. The result of these elections shows that number of voter abstention is very high. On the first term of 2004 presidential election, about 21.77% of official voters were abstain. On the second term, it increased to 23.37%. Five years later, the number of voter abstention was still high which increased to 27.19%. This research aims to identify spatial pattern and spatial relationship of 33 provinces that produce voter abstention number in the 2009 presidential elections and to identify voter characteristics. The data used are secondary data from General Election Commision of Indonesia (KPU) for an official result of 2009 presidential election and Central Bureau Statistics of Indonesia (BPS) for characteristics of provinces. The results of this research show that there is positive spatial autocorrelation for voter abstention data, which means that there are similiar proportion of provinces to their neighbors in Indonesia. Provinces that are significant to spatial autocorrelation are Riau, Riau Islands, West Sumatera, Central Kalimantan, and Gorontalo. According to significant provinces, there are not province identified as hotspot or coldspot observation. Determining factors that are significantly affected to voter abstention using Spatial Error Model (SEM) is better than Spatial Autoregressive Model (SAR) and Multiple Linier Regression. There are six significant explanatory variables, i.e. percentage of poor people, monthly average of wage/salary/income of employee, mean years of schooling population 15 years of age and over, human development index, school enrollment ratio 16-18 years of age, and life expectancy at birth.
Keyword: voter abstention, spatial error model, spatial autocorrelation, k-nearest neighbor, election

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.
Keyword: