Judul: Pemanfaatan Tumbuhan Pangan dan Obat Oleh Masyarakat Kampung Sinarwangi di Sekitar Hutan Gunung Salak, Kabupaten Bogor
Abstrak: The needs of food and medicine always increase. The fulfillment of these needs can be met by the utilization of natural resources. Many plant species contains nutrients and essential contents for health and medicinal materials that needs to be explored. Sinarwangi Village is a village around the food of Mount Salak, Bogor. Community of Sinarwangi Village utilize food and medicinal plants directly. Plant untilization which is done by Sinarwangi Village community was closely related to food and health needs in their daily life. The aim of this study is to identify and asses the diversity of food and medicinal plants, also conservation practices in Sinarwangi Village on the utilization of food and medicinal plants. This study was conducted on Mey until June 2012 at Sinarwangi Village by using interviews with a purposive sampling respondent selection as much as 30 respondents. The result of this study showed that there are 79 species from 40 family food plants and 89 species from 47 family identified as medicinal plants from various kind of habitus. The utilization of food plants was dominated by Cucurbitaceae as much as 8 species. Cucurbitaceae family was the main comodity to fulfill the needs of food. The habitus of food plants was mostly tree habitus as much as 30 species. The utilization of medicinal plants was dominated by Zingiberaceae and Fabaceae as much as 8 species. The highest habitus of medicinal plants was herbs habitus as much as 34 species (38%). The knowledge of food and medicinal plants utilization was mostly come from hereditary. The conclusion of this study is that community of Sinarwangi Village utilized plants for food and medicine. Conservation practices such as plant conservation activity, plant cultivation activity and land use. Use of land in Sinarwangi Village includes land use for residential, gardens, fields and forest.
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Judul: Pemanfaatan Tumbuhan  Masyarakat Kampung Wangun I, Desa Karang Tengah, Kecamatan Babakan Madang, Kabupaten Bogor
Abstrak: Pemanfaatan tumbuhan di sekitar hutan merupakan tradisi masyarakat yang tinggal di sekitar hutan. Penelitian ini bertujuan mengidentifikasi spesies tumbuhan berguna dan mengetahui bentuk pemanfaatan tumbuhan serta aksi konservasi masyarakat Kampung Wangun I. Teknik pengumpulan data melalui studi pustaka, observasi lapang, dan wawancara 35 responden dengan metode snowball sampling. Hasil penelitian diketahui tumbuhan berguna teridentifikasi sebanyak 145 spesies dari 63 famili. Famili terbanyak yaitu famili Fabaceae 13 spesies (29.9%). Tumbuhan obat merupakan spesies terbanyak dimanfaatkan warga 85 spesies dari 45 famili. Bentuk kearifan tradisional dalam pemanfaatan tumbuhan yaitu pembuatan gula aren. Aksi konservasi warga dalam melestarikan lingkungan meliputi pemanenan madu hutan, dan budidaya tumbuhan hutan.
Keyword: action of conservation, local tradition, useful plant.

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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