Judul: Potensi dan Pemanfaatan Tumbuhan Berguna Di Cagar Alam Bojonglarang Jayanti Kabupaten Cianjur Jawa Barat
Abstrak: Bojonglarang Jayanti Nature Reserve is a protected area which has various ecosystem including lowland forest, and land processed forest. This research purposes are to identify the potency of useful plant and the utilized plants by the local people. The methode of research wash conducted by vegetation analysis and snowball sampling technik for interview. The calculation of vegetation analysis in every forest formation has the diversity index > 1,5 and evenness > 0,5 in every growth level. The vegetation analysis of useful plant potency wich is ±83% identified or 128 species from 154 species that belong into 57 families. People utilization of herb, there are 130 species that belong into 51 families. Mostly those plants are utilized as medicine, housing material, and food.
Keyword: Bogor Agricultural University (IPB), society, plants potency, Bojonglarang Jayanti nature reserve

Judul: Potensi Keanekaragaman Tumbuhan Pangan dan Obat di Cagar Alam Cibanteng, Sukabumi, Jawa Barat
Abstrak: Cagar Alam Cibanteng memiliki tipe hutan dataran rendah dan hutan pantai dengan keanekaragaman spesies tumbuhan yang tinggi. Penelitian ini bertujuan untuk mengidentifikasi komposisi dan struktur vegetasi, potensi keanekaragaman tumbuhan pangan dan obat serta bentuk pemanfaatannya oleh masyarakat. Metode yang digunakan yaitu analisis vegetasi dan wawancara. Cagar Alam Cibanteng memiliki 137 spesies tumbuhan dari berbagai habitus dan tingkat pertumbuhan. Hasil perhitungan analisis vegetasi disemua tipe hutan memiliki nilai keanekaragaman > 0.98 dan nilai kemerataan > 0.50 dari semua tingkat pertumbuhan. Potensi tumbuhan pangan dan obat sebanyak 79 spesies yang terdiri dari 6 spesies tumbuhan pangan, 22 spesies tumbuhan pangan fungsional dan 51 spesies tumbuhan obat. Pemanfaatan spesies tumbuhan pangan dan obat oleh masyarakat sekitar CA Cibanteng terdiri dari 11 spesies tumbuhan pangan, 7 spesies tumbuhan pangan fungsional dan 46 spesies tumbuhan obat. Tumbuhan yang bernilai ekonomi terdiri dari 12 spesies tumbuhan obat, satu spesies tumbuhan pangan fungsional dan tiga spesies pangan.
Keyword: cagar alam cibanteng, pemanfaatan, potensi tumbuhan

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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