Judul: Determinant of Regional Food Security and Household Food Security in East Java Province.
Abstrak: Food availibility is a necessary but not sufficient condition for regional food security. Regional food security does not guarantee household food security. This study aims is to determine the factors that affect regional food security and households food security in East Java Province. The analysis was done by using the 2002, 2005 and 2008 SUSENAS data and other supporting data. Regional food security analysis was conducted by using panel data regression. Meanwhile, household food security analysis was conducted by using ordinal logistic regression. The results shows improved food security and convergence between districts in East Java Province. Production of paddy, education, roads and market infrastructure significantly affect regional food security. Income per capita, the classification of regional (urban/rural), education of household head, age of household head, household size, occupation of household head, and food aid significantly affect households food security.
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Judul: Factors Determination that Influence Food Insecurity in Central Java Using Spatial Panel Data Analysis
Abstrak: Food insecurity refers to the consequence of inadequate consumption of nutritious food at region, society or household, considering the physiological use of food by the body as being within the domain of nutrition and health. Sutawi (2008) explained that availability and achievability on aggregate scale, Indonesia citizen is appertained food secure. However, household with food insecure still found in almost whole provinces with high proportion. So, it is necessary to do a research to determine factors that influence food insecurity in a province by calculating spatial effect of inter-regency or municipality. In this research, food insecurity that will be analyzed is food insecurity in Central Java using spatial panel data analysis. Cross-section unit in this research is 35 regencies or municipalities in Central Java province which was observed for 4 years (2007-2010) as time series unit.The analysis result in this research show that fixed effect model with SAR are better used for modelling food insecuity in Central Java. This model show that production of paddy (X2) and local government original receipt of regency or municipality (X3) influence percentage of citizen with food insecure that consume calorie under basic requirement 2100 kkal/capita/day (Y) with R2 95.88%. Coefficient of λ indicates that spatial autoregressive effect significant in influencing percentage of citizen with food insecure in Central Java.
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Judul: Penyalutan Nanotube Paduan Logam Ti-6Al-4V dengan Komposit Hidroksiapatit-Kitosan Menggunakan Metode Elektroforesis Deposisi
Abstrak: Paduan logam Ti-6Al-4V digunakan sebagai bahan implan tulang karena sifatnya yang biokompatibel dan tahan korosi. Akan tetapi, kelemahan paduan logam ini tidak bersifat bioaktif dan mudah melepas kation Al dan V ketika diimplankan ke dalam tubuh manusia. Untuk itu, tujuan penelitian ini ialah membentuk struktur nanotube pada permukaan paduan logam Ti-6Al-4V serta menyalutkan komposit hidroksiapatit(HAp)-kitosan pada nanotube paduan logam Ti-6Al-4V. Nanotube dibentuk melalui metode anodisasi dalam larutan NH4F 5% pada tegangan 20 V selama 1 jam. Hasil pencirian dengan mikroskop elektron payaran menunjukkan nanotube terbentuk secara heterogen dan tidak seragam dengan diameter lubang 2‒3 μm. Komposit HAp-kitosan disalutkan pada nanotube tersebut dengan metode elektroforesis deposisi pada tegangan 100 V selama 1 jam. Hasil penyalutan merata, tidak ada perbedaan yang cukup jelas antara penyalutan komposit HAp-kitosan pada bagian nanotube dan bagian tanpa nanotube. Hasil pencirian difraksi sinar-X dan inframerah transformasi Fourier menunjukkan komposit HAp-kitosan telah menyalut paduan logam Ti-6Al-4V.
Keyword: anodisasi, hidroksiapatit, kitosan, nanotube, Ti-6Al-4V