Judul: Determination of Agricultural Potential Area Based on Land Suitability and Revenue Cost Analysis. Case study in Bantul Regency, Yogyakarta
Abstrak: Nowadays, the population of the world is growing dramatically. Under present situations, where the land is a limiting factor, it is impossible to bring more area under cultivation (extensive farming), so farming community should tackle this challenge of producing more and more food with the available land only (intensive farming). Bantul regency which one of the food source in Yogyakarta has undergone rapidly tremendous economic growth during last few years. This condition caused the decreasing of agricultural areas to industrialized, tourism and settlement areas. The objective of this research is to explore the geographic information systems on defining potential agricultural area based on land suitability and revenue cost analysis in Bantul Regency. Land suitability analysis is a prerequisite for sustainable agricultural production. It involves evaluation of the criteria ranging from soil, terrain to socio-economic, market and infrastructure. Many of these factors are vaguely defined and characterized by their inherent vagueness. Multicriteria decisionmaking techniques like weighting, ranking, rating etc. are employed for suitability analysis. Simple Additive Weighting (SAW) or Weighted Linear Combination (WLC) is the most often used technique in multi-criteria decision making. As this process incorporates expert knowledge and judgment by decision makers at various levels, it is very much subjective in nature. Revenue cost analysis is needed in this research for determining agricultural potential area, in order to get the maximum benefit out of the land in the research area which had several land suitability level of several crops. The result of this research showed how land suitability and revenue cost analysis approach were very useful to determine the agricultural potential area in Bantul Regency. The agricultural potential area consists of potential area for corn, rice, soybean, and peanut.
Keyword: Agricultural Potential Area, Land Suitability, Revenue Cost Analysis, GIS

Judul: Land suitability analysis for agriculture area using weighted method: a case study in Bogor
Abstrak: This research was conducted from January 2005 June 2005, In Bogor, West Java- Indonesia. Geographically the area is located between 106°35'00" - 106°50"30" East longitude, and 06°25'00" - 06°45'00' South latitude. The area cover 743.65 square kilometers and consists of 21 (twenty-one) sub districts, including municipality. The main objective of this research is to define suitable area for agriculture by using weighted method. The general objectives of the research area are: 1) to provide information about weighted method technical to analyze land suitability, 2) to provide information land suitability for agriculture of Bogor area. The data input was collected from various source, among others: 1) The National Coordinating Agency for Survey and Mapping (Bakosurtanal), 2) Center for Soil and Agroclimate Research (Puslitanak)- Bogor for information on soil type which is derived from the regional soil type map of Bogor, 3) The Bureau of Metrology and Geophysics (BMG) - Bogor for rainfall data. 4) Biotrop Training and Information Center of SEAMEO BIOTROP for the imagery of Landsat TM 2002 and Landsat TM 2000 for West Java. The analysis method used is the weighted method overlay conducted using Arc View-32 focusing on weighted method for single crop, weighted method for group crops, weighted method for an area. From the analysis, we concluded the following: 1) technically, the use of weighted method is variable where each process is very much influenced by data input. 2) Weighted method analysis provides three criterias i.e. very suitable area, suitable area and less suitable area for each crop or group crop.
Keyword: weighted method, analyze land suitability, weighted method technical

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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