Judul: Land Suitability Evaluation Of Guava Crop (Psidium Guajava) At Bogor Regency By Using Geographical Information System
Abstrak: Currently medicinal crop were pavorited by society because they have many advantages, besides they may cure various diseases, they also can be used as economics sources to farmers. One of these medicinal crop is guava crop, where not only it’s leaf can be sold, and also it’s fruit. To develop guava crop at Bogor Regency, it needs land suitability evaluation. The evaluation plays in development of guava crop especially at suitable place, so that it’s development can be more efficient and effective. The aim of this research was to map land suitability of guava crop at Bogor Regency, to map of land suitability evaluation with it’s actual status at Bogor Regency, and to evaluate location of center guava crops according to land suitability. This research method used geographical information system consisting two phases; secondary data collection and data analysis phase. Secondary data were: topography map, land system map, satellite image ( Landsat TM7), rainfall data, and few statistical data. The analyses were divided into five category: Landsat image analysis, topography data analysis, land systems analysis, rainfall analysis, and land suitability analysis. The result of the research was presented in a map. The reason is a map as spatial data presentation has visual appearance and has information which store in tabular data form. According to the land suitability evaluation analysis of guava crop at Bogor Regency, the land suitability class of S1 has 2,40 % (7.065,326 ha), S2 (S2w, S2tw, S2mw, S2mwt, S2m, S2mt) 12,82 % (37.650,770 ha), S3 (S3w, S3mw, S3emw, S3mtw, S3tw, S3e, S3m, S3em) equal to 50,82 % (149.250,679 ha), and N equal to 33,96 % (99.727,922 ha). According to it actual survey area, the center of guava crops were found dominant at land suitability of class S3.
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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: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa