Judul: Studi potensi habitat banteng (bos javanicus d'alton) di Cagar Alam Leuweung Sancang, Kabupaten Garut, Jawa Barat
Abstrak: Banteng (Bos javanicus d'Alton) merupakan salah satu satwa langka yang dilindungi dan termasuk dalam katagori Vurnerable, populasinya sedang menuju tahap yang membahayakan dari kelestariannya (Red Data Book IUCN, 1972 dalam Alikodra, 1983). Kelestarian satwaliar seperti banteng sangat tergantung pada habitatnya, sehingga untuk menjaga kelestariannya harus dijaga pula habitatnya agar tetap dalam kondisi yang baik, dalam artian habitat tersebut masih dapat menyediakan makanan, air dan tempat berlindung bagi banteng. Perubahan ekosistem yang terjadi akibat aktivitas manusia yang bersifat negatif tidak saja menimbulkan perubahan terhadap iklim mikro akan tetapi juga menimbulkan perubahan terhadap lingkungan biotik satwaliar, seperti penurunan daya dukung habitat dalam menyediakan makanan dan tempat berlindung. Menurut Alikodra (1990) kualitas dan kuantitas habitat sangat menentukan prospek kelestarian satwaliar. Upaya pengelolaan dan pembinaan habitat satwaliar akan menjamin kelangsungan hidupnya. Untuk mengetahui kondisi habitat perlu dilakukan pengamatan tentang potensi habitat dalam kaitannya. dengan upaya pelestarian satwa (banteng) khususnya di Cagar Alam Leuweung Sancang. Penelitian ini bertujuan untuk mengkaji beberapa komponen habitat banteng di Cagar Alam Leuweung Sancang yang meliputi kualitas dan kuantitas makanan, kualitas dan kuantitas air sebagai sumber air minum, serta kualitas lingkungan pendukung habitat banteng (tempat berlindung, organisma lain dan interaksinya dengan manusia). Penelitian dilakukan di Cagar Alam Leuweung Sancang Kabupaten Garut, Jawa Barat, yaitu di daerah Cijeruk, Cipalawah dan Cibako, selama dua bulan pada bulan Desember 1997 sampai Pebruari 1998. Pengamatan dilakukan terhadap struktur dan komposisi jenis vegetasi pakan banteng dan vegetasi yang bukan pakan banteng, tingkat kesukaan terhadap pakan banteng, tingkat keasaman dan debit air, thermal cover (pelindung dari cuaca yang buruk) dan hiding cover (tempat persembunyian)...
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Judul: Faktor-Faktor Penyebab Kepunahan Banteng (Bos javanicus) di Cagar Alam Leuweung Sancang Jawa Barat
Abstrak: Banteng (Bos javanicus) is one of wildlife species that is categorized into the conservation status of "Endangered" which its habitat and population continue to decline to extinction even in natural reserve such as Leuweung Sancang Natural Reserve. Habitat and population of banteng currently just located in national park which is wide area and intensive management with other protected areas including Leuweung Sancang Natural Reserve. The objective of this research is to anlyze the extinction factors of banteng in Leuweng Sancang Natural Reserve by identifying and analyzing the population, distribution, habitat, socio-economic activities of communitie and area management system. To identify ecology, socio economic and management condition with literature study and interview. The research analysis is reliability and validity instrument, spatial, qualitative, quantitative and correlation factors. Wide and shape area, boundary area, area status, PMP activities, stakeholders, community perception and community interaction are all factors than can affect to banteng extinction in Leuweung Sancang Natural Reserve. Correlation factors are (a) wide and shape area (WSA) with community interaction (0.540350); (b) PMP activities with community interaction; (c) boundary area with area status (0.531250). The extinction factors of banteng are illegal hunting that impact of 3 factors, are: (1) habitat degradation especially less maintenance of grazing area and the elongated shape of Leuweung Sancang Natural Reserve did not support banteng population, (2) less of management intensity, (3) local people negative perception for banteng existence.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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