Judul: Dampak Kehadiran Ritel Modern terhadap Profitabilitas Pedagang Pasar Tradisional di Kota Bekasi
Abstrak: The aims of this research are to analyze the impact of modern retail on the profitability level of traditional market traders in Bekasi. The market selection is done by purposive sampling method. Jatiasih Market and Family Mart Market are selected as treatment group and Bantargebang Market is selected as control group. The methods using in this study are t-test, chi-square test, and ordinal logistic regression. Factors influencing changes of profit are the number of buyers, the distance between the traditional market with the modern retail, the main commodity of fresh products and processed products. The closer distance the traditional market to the modern retail, the more chance of traditional market traders to increase their profits.
Keyword: t-test, modern retail, traditional markets, ordinal logistic regression, profit, chi-square test

Judul: Dampak Kehadiran Ritel Modern terhadap Profitabilitas Pedagang Pasar Tradisional di Provinsi DKI Jakarta
Abstrak: The aims of this research are to analyze the impact of modern retail on the profitability level of traditional market traders in DKI Jakarta. The research was conducted on the three traditional markets in DKI Jakarta, which are Jembatan Besi Market and Menteng Pulo Market as treatment markets (traditional market which is close to the modern retail), Lenteng Agung Market as control market (traditional markets which is far from modern retail). This research uses t-test, chi-square test and ordinal logistic regression. The existence of modern retail affect the profit of traditional market traders changes in DKI Jakarta. The closer distance the traditional market to the modern retail, the more chance of traditional market traders to decrease their profit
Keyword: t-test, chi-square test, ordinal logistic regression, profit, performance, characteristics

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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