Judul: Kajian Ekologi Situ Citayam, Depok Jawa Barat dalam Upaya Pelestarian dan Peningkatan Fungsi Situ
Abstrak: Situ or lake is one of tl~ep otential wetland that could be developed by natural or man made.Natunl situ need more intensive treatment, in order tlle function and the potency of situ will not lost.This research is done by studying the ecological condition of Situ Citayam freshwater. The study focused on the general condition of freshwater. Water quality analyzed by physical, chemical, and biological parameter. The abundance and, diversity of plankton were analyzed by Shannon Wiener diversity index (H'). Nitrogen and phospoms ratio was counted to get the main limited factor of water organism growth, and double linier regression analysis to know the relation of physical, chemical, and biological parameter. Physical and chemical of water quality showed tllat the condition of freshwater has been polluted in middle range. It caused by domestically waste water and soil erotion which causing superficial in some region. The indicator of the middle polluted level Situ Citayam is guessed from the mesosaprobic organism which found out, it consists of Brachionus, Oscillatoria, ~Melosira. Scenedesn~ us, Pediastrunr, Vorticella, and Spirogym. All the matters supported by index diversity of Shannon Wier in range between 1,12 to 1,30. Nitrogen and pl~osporus ratio counted show that the main limited factor of water organism growth in the situ was phosporus. The result of double linier regression analysis described a very close relation between the physical. chemical, and the biological parameter as well.
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Judul: Upaya Pengelolaan Kualitas Perairan untuk Pengembangan Wisata Air Situ Sawangan-Bojongsari di Kota Depok
Abstrak: Development of situ into water tourism area is an effort to conserve situ from development activities damage, so that situ can generate ecological, economic, and aesthetic benefits. Situ Sawangan-Bojongsari is one of small lakes in Depok that is being developed into water tourism area. Accordingly, this research aimed to study the management, water quality, visitor perceptions, and the level of residents knowledge of small lake environmental material and water tourism development in Situ Sawangan-Bojongsari, and also make recommendation of water quality management strategies for water tourism development in Situ Sawangan-Bojongsari. The management of Situ Sawangan- Bojongsari must be improved by requiring cooperation and better coordinating between the stakeholders involved in: Center Government, Local Government, Working Group of Situ Sawangan-Bojongsari, Forum of Situ Working Groups in Depok, private sector, and NGOs. Water condition of this small lake tends to be good enough for the water tourism development, but some measurements of some parameters exceed or not conform with the water quality standard. The water quality of small lake can decrease more quickly because of anthropogenic activities. Perceptions of visitors to the condition of Situ Sawangan-Bojongsari and its tourism are good enough, but small lake management and water tourism facilities improvement should be performed. The levels of residents knowledge of the small lake environmental material and water tourism development are respectively quite good, but still need to be improved into good comprehension and attitudes. Based on hierarchy analysis, the community empowerment is an alternative to the highest priority, followed by socialization, and recommendation of area management.
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Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix