Judul: Pelapisan Hidroksiapatit (HAp) pada Permukaan Logam Stainless Steel 316L dengan Metode Deposisi Elektrororesis (EPD)
Abstrak: Telah dilakukan penelitian untuk melapisi permukaan logam stainless steel 316 L. Oleh materian hidroksiapatit dengan metode deposisi elektroforesis. Hodrokiapatit dibuat dengan metode presipitasi, dari hasil kalsinasi cangkang telur pada suhu 1000 derajat celsius selama 5 jam dan (NH4)2HPO4. Pemilihan logam stainless steel (SS) didasarkan pada fisik ketahanan korosi yang baik, kadar impuritas rendah, dan mudah dibentuk. Penelitian dilakukan dengan melarutkan hidroksiapatit pada etanol ditambah trietanolamin sebagai dispersan.
Keyword: 

Judul: Pelapisan hidroksiapatit (HAp) pada permukaan logam Stainless Steel 316L dengan metode deposisi elektroforesis (EPD)
Abstrak: Telah dilakukan penelitian untuk melapisi permukaan logam stainless steel 316 L. oleh material hidroksiapatit dengan metode deposisi elektroforesis. Hidrokiapatit dibuat dengan metode presipitasi, dari hasil kalsinasi cangkang telur pada suhu 1000°C selama 5 jam dan (NH4)2HPO4- Pemilihan logam stainless steel (SS) didasarkan pada sifat ketahanan korosi yang baik, kadar impuritas rendah, dan mudah dibentuk. Penelitian dilakukan dengan melarutkan hidroksiapatit pada etanol ditambah trietanolamin sebagai dispersan. Konsentrasi Ca/ P yang digunakan pada saat presipitasi yaitu 0,3/0,16. Spektra infra merah menunjukkan hilangnya karbonat pada sampel hasil presipitasi yang dipanaskan pada suhu 900°C. Pola difraksi sinar X untuk hasil presipitasi yang dipanaskan pada suhu 900°C, menunjukkan fasa yang terbentuk adalah hidroksiapatit. Pola difraksi setelah coating menunujukkan adanya fasa hidroksiapatit dan base metal yaitu logam SS. Hasil uji mikrostruktur menunjukkan, diantara penggunaan variabel tegangan 30 V; 60 V dan 90 V selama 1, 2, dan 3 menit pada saat coating, penggunaan variabel tegangan 60 V selama 2 menit, menunjukkan hasil pelapisan yang paling merata pada permukaan logam SS. Sintering dengan suhu 800°C lebih menguatkan pelapisan hidroksiapatit pada permukaan logam dibandingkan dengan sintering pada suhu 250°C.
Keyword: Surface coating, Hydroxyapatite, Stainless steel, Deposition elektoforesis, Sintering;

Judul: The Role of Cocoa Sector in The Indonesian Economy: An Input-Output Analysis
Abstrak: Agriculture is a potential sector in supporting economy and national income. This is because Indonesia has a comparative advantage. The agricultural land is still widespread and most people still rely on agriculture for their livelihood, and agriculture is a renewable business. So that this sector can stand for an indefinite period. This agriculture is including livestock farming, forestry, fisheries, and tree crop. One of Indonesia's agricultural commodities are cocoa. Cocoa is one of tree crop commodity sector that have a vital role to the national economy. Cocoa is one of Indonesia's main export commodities in producing national wealth. The existence of Indonesia as a major of cocoa producer in the world shows that Indonesian cocoa is feasible to count and have a chance to dominate the global market. The research objectives are to analyze the role of the cocoa sector in the Indonesian Economy (intermediate demand and final demand), gross value added, and the structure of exports and imports; analyze forward linkage and backward linkages; analyze coefficient of dispersion and sensitivity of dispersion; and analyze output multiplier and income multiplier effect seen from the cocoa sector in the national economy. The data used in this research is a secondary data. The data used were derived from the Input - Output Table of Indonesia domestic transactions on the basis of producer prices in 2005, 175 sector classification from Statistics Indonesia which is then aggregated into 22 sectors. Several other secondary data obtained from government agencies and other relevant agencies. The use of Input - Output Table of Indonesia in 2005 is due to a new table for this study took place. Data is processed by utilizing Input-Output Analysis for Practitioners (IOAP) Complementary Version 1.0.1. and Microsoft Excel. The results shows that the cocoa sector has a positive contribution to the establishment of Indonesia's GDP. Cocoa sector has a backward linkage higher than the forward linkage. This suggests that the cocoa sector has a greater ability to output to be used as inputs in other sectors than the output of the cocoa sector to be used as input for other sectors. Cocoa sector has a coefficient value higher than the sensitivity dispersion. This suggests that the cocoa sector increase its upstream sector highly than the downstream sector. Based on the analysis of output and income multipliers can be concluded that the cocoa sector has a considerable multiplier effect on economic output and incomes in all sectors of the economy in Indonesia. Cocoa sector is ranked the 20th priority sector. While the first priority sector is other tree crops sector.
Keyword: Cocoa, Indonesian Economy, Input-Output Analysis