Judul: Impact of investment inflows on regional disparity in Indonesia
Abstrak: Some tactical pilicies related to region development, whether they were intended or not, were implemented since the early 1970's. Moreover some policies have been formulated in 1990s to reduce regional disparities. However, they are more in normative level than implementation. An increasing level of regional income inequality, which accompanied the rapid economic growth, shows the failure of same those policies. The large differences in economic indicators among provincies in Indonesia are no doubt due to the very significant inequality of investment inflows. The problem of ecomonic disparity across Indonesia will still exist. This study aims to analyze the disparity of regional economy by testing the income convergence; to identify the relationship between regional income and investment inflows and to find the determinants of foreign investment inflows into provinces
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Judul: Impact of Investment on Economic Disparities between Regions in Indonesia
Abstrak: Perbedaan pendapatan perkapita antar wilayah provinsi semakin besar dalam kurun waktu 4 tahun terakhir, sementara dalam kurun waktu tersebut investasi cenderung meningkat. Dengan demikian tujuan utama penelitian ini adalah mengukur tingkat ketimpangan antar wilayah berdasarkan Indeks Williamson dan menganalisis dampak investasi terhadap ketimpangan tersebut. Metode yang digunakan pada penelitian ini adalah analisis regresi data panel dan perhitungan indeks Williamson. Data dalam penelitian ini diperoleh dari Badan Pusat Statistik, BKPM dan Open Data PUPR. Hasil analisis menunjukan bahwa tingkat ketimpangan wilayah cenderung tinggi atau mendekati angka 1 dalam kurun waktu 4 tahun yaitu dengan rata-rata nilai indeks Williamson sebesar 0,71. Berdasarkan analis data panel menunjukan bahwa investasi berpengaruh negatif dan signifikan terhadap ketimpangan ekonomi antar wilayah. Variabel infrastruktur dan tingkat pengangguran terbuka bersama-sama berpengaruh positif dan signifikan terhadap ketimpangan ekonomi antar wilayah. dan variabel tingkat pendidikan berpengaruh negatif dan tidak signifikan terhadap ketimpangan ekonomi antar wilayah di Indonesia., The difference in per capita income between provinces has been getting higher in the last 4 years, while during this period investment tends to increase. Thus, the main objective of this study is to measure the level of inequality between regions based on the Williamson Index and to analyze the impact of investment on this inequality. The method used in this study is panel data regression analysis and the calculation of the Williamson index. The data in this study were obtained from the Central Statistics Agency, BKPM and PUPR Open Data. The results of the analysis show that the level of regional inequality tends to be high or close to number 1 in a period of 4 years, with an average Williamson index value of 0.71. Based on panel data analysis, it shows that investment has a negative and significant effect on economic inequality between regions. The infrastructure variable and the open unemployment rate together have a positive and significant effect on economic inequality between regions. and the variable level of education has a negative and insignificant effect on economic inequality between regions in Indonesia.
Keyword: investment, regional inequality, williamson index

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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