Judul: Penilaian Ekonomi Berbagai Pola Penggunaan Lahan Berdasarkan Citra Satelit Ikonos Tahun 2003 (Studi Kasus di Sub DAS Ciesek, DAS Ciliwung Hulu, Kabupaten Bogor)
Abstrak: The type of land uses in sub-watershed of Ciesek which is located in the upstream of Ciliwung watershed affects the downstream area. The land use types in the upstream give a negative externality to the downstream area. Land use types which are not in accordance with regional land use allocation plan may give a higher economical benefit. On the other hand, the environmental functions can be disturbed. A higher resolution satellite image, Ikonos of the year of 2003, was used to identify the land use types. This study aims to obtain information on land use types with remote sensing analysis using ikonos satellite image and to assess the economical value of subwatershed of Ciesek, Ciliwung Hulu Watershed. The concept of economical valuation which was used to assess the economical value of protected area is the concept of total economical value. The methods are market price valuation, travelling cost, substitution cost and continget valuation methods. Productivity approach was used as the method of cultivation area valuation. The research shows that the land use types of Ciesek sub-watershed are not in accordance with the allocated types. The total economical value of the protected area is 5,068,626,150.83 rupiahs/year or 7,741,539.89 rupiahs/ha/year. The economical value of the wet land agriculture is 3,729,747 rupiahs/ha/year, dry land agriculture is 7,905,698.23 rupiahs/ha/year. Mixed garden has the economical value of 3,435,982.91 rupiahs/ha/year while the common house types has the value of 554,653,679.65 rupiahs/ha/year and villa types give the value of 1,288,702,928.87 rupiahs/ha/year.
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Judul: Water economic value change analysis caused landuse changing case study in Cidanau Watershed in Banten Province
Abstrak: Cidanau is the most important watershed in Banten Province because it has provided economic activity in Serang and Cilegon regions. The users of water services from Cidanau watershed are farmers, households, fisheries, small scale industries, water industries and Krakatau Tirta Industries. Those have been analized to find total economic values of Cidanau water. The aims of the reaserch are to analize water economic value by market pricing and gathering cost, to analize factors influencing water demand curve, and to analize landuse changes of Cidanau and its relationships with water economic values changes from 1997 to 2004. Landsat imaging and GIS of Cidanau have been used the research. The methods of the research are use gathering cost and market pricing to find water values from the users. While the GIS and Remote Sensing have been used to detect landuse changes in Cidanau watershed from 1997 to 2004. Both water values and landuse changes have been analized to find relation the others. The results of the reaserch allows that firstly, total water economic value in 1997 increase Rp 52.006.323.743 per year and in 2004 increase Rp 126.456.999.536 per year. Secondly, landuse of Cidanau has changed in 1997 to 2004; bare land changed is decrease 35.56 %, paddyfield is increase 0.59 %, forest is decrease 4.2 %, agroforest is increase 21.072 %,, shrubs is increase 28.25 %, and wet lands is decrease 9.39 %..
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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