Judul: Studi Penyebaran Jenis Tumbuhan Eksotik dan Persepsi Masyarakat terhadap Penggantiannya di Taman Nasional Gunung Halimun Salak (Studi Kasus di Stasiun Penelitian Cikaniki)
Abstrak: Gunung Halimun Salak National Park (TNGHS) surrounded by the area of rural district, agricultural and plantation. So that this area becomes susceptible one of them is the attack of strange species (eksotik) which came to the area. The coming of eksotik plan to the TNGHS has a negative impact to the existence of genuine plant. So that, it has to manage the eksotik plan. The first step to manage is the needed of the data of spread, benefit and the perception of society toward the eksotik plan. This research has three purpose, they are: (1) spread of eksotik plant at Cikaniki research station (TNGHS), (2) the benefit of eksotik plant at Cikaniki research station (TNGHS), and (3) society perception on eksotik plan substitution in Cikaniki research station (TNGHS). This research carrying out at Cikaniki research station (TNGHS) Malasari village, Nanggung Sub district, Bogor regency on July until August 2009. Primary data and secondary data are use in they research. Primary data obtained from the analysis of vegetation using compartmentalized stripe and result of interview which using snowball method toward 30 respondents. Secondary data obtained from house of TNGHS, the government of Malasari village and literature study. Forest vegetation data obtained analyze by calculate: type frequency, the density of type, type domination, emphatic value index, varied type, dominate index and spread pattern. Tabulation and scoring of interview result then describe in descriptive. To measure relationship closeness between respondent characteristic and level perception, used correlation spearman test. The eksotik plant which found in research location are: harendong bulu (Clidemia hirta), ki rinyuh (Eupatorium pallescens), kecubung (Brugmansia suaveolens), kaliandra (Calliandra calothyrsus), and seuseureuhan (Piper aduncum). It growth at 1.000-1.077 m dpl, and has grouping spreaded pattern. The kind of eksotik plant which used by the society are kaliandra (Calliandra calothyrsus), sesuseureuhan (Piper aduncum), pinus (Pinus merkusii), ki rinyuh (Eupatorium pallescens), teh (Camellia sinensis), sengon (Paraserianthes falcataria), and kayu afrika (Maesopsis eminii). It used for firewood, medicine and cattle food. Society perception toward eksotik plan spread justify; low (0-2), medium (3-5), and high (6-8) they are 33,33%. A lot of society (53,33%) states that they are agree with tes subtition of eksotik plant.
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Judul: Economic Value Estimation of Flora Diversity Potentially as Medicinal Plants in National Park of Mount Halimun Salak
Abstrak: Taman Nasional Gunung Halimun-Salak (TNGHS) merupakan salah satu Taman Nasional yang memiliki keanekaragaman flora yang tinggi yang berada di Provinsi Jawa Barat. Penelitian ini bertujuan untuk mengetahui jenis-jenis tanaman yang sudah dimanfaatkan oleh masyarakat Desa Malasari di Pengelolaan Taman Nasional Wilayah Cikaniki (PTNW Cikaniki), baik itu yang sudah dikomersialkan atau belum dikomersialkan, menghitung nilai ekonomi dari keanekaragaman flora yang berpotensi sebagai bahan baku obat di TNGHS, dan mengetahui stakeholder yang terkait dengan pengelolaan keanekaragaman flora yang berpotensi sebagai bahan baku obat di TNGHS. Metode harga pasar dan harga barang pengganti digunakan untuk mengetahui nilai ekonomi tanaman, dan snowball sampling untuk mengetahui stakeholder terkait dalam pengelolaan Berdasarkan hasil penelitian, terdapat 145 jenis tanaman yang memiliki manfaat obat, beberapa diantaranya sudah dikomersialkan diolah menjadi produk, 53,8% tanaman telah dikomersialkan dan belum dikomersialkan menghasilkan persentase 46,2%. Nilai keuntungan pengolahan tanaman obat berbentuk kapsul paling tinggi dimiliki oleh jahe merah dengan keuntungan Rp4.650.000 per 20 kilogram bahan baku segar, selain itu terdapat 5 stakeholder yang terkait dalam pengelolaan keanekaragaman flora berpotensi sebagai obat baik itu secara langsung maupun tidak langsung dengan stakeholder paling berpengaruh dan berkepentingan adalah TNGHS. Kata kunci: nilai ekonomi, Taman Nasional Gunung Halimun-Salak, tanaman obat, analisis stakeholder
Keyword: analisis stakeholder, nilai ekonomi, tanaman obat, TNGHS, economic value, National Park of Mount Halimun Salak, medicinal plants, stakeholder analysis

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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