Judul: Etnobotani Pangan Suku Matbat di Pulau Misool Kabupaten Raja Ampat Papua Barat
Abstrak: Indonesia community consists of various ethnic groups who have different knowledge of food plants. However, there is documentation about knowledge and utilization of food plants. The documentation can be done through ethnobotanical study. Purpose of the research was to identify the diversity of the used of food plants by the matbat ethnic. The research was conducted in Tomolol village, Misool islands of Raja Ampat, West Papua, on August-September 2012. The data was collected through observation and interview using purposive sampling method. Based on this research, the ethnic used 63 species of 33 families was the food plants with a predominance of family Arecaceae. The plants were mostly found in the yard and garden, and there were 11 species found wild in lowland forests. People In this ethnic still found nomadic farming system model with traditional agroforestry gardens. Traditional knowledge identified the forbiddean or moratorium the used of plants called “sasi”
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Judul: Etnobotani Pangan dan Obat oleh Masyarakat Minang di Kecamatan Simpang Alahan Mati, Pasaman Timur, Sumatera Barat.
Abstrak: Masyarakat tradisional masih banyak yang bergantung terhadap sumberdaya alam sebagai kebutuhan utama seperti pangan dan obat, kemudian didokumentasikan dalam pengetahuan tradisional “Etnobotani”. Masyarakat tradisional memenuhi kebutuhan pola makanan sehat dan penggunaan obat dari alam yang lebih baik dan praktis dibandingkan masyarakat yang hidup didaerah perkotaan. Penelitian ini betujuan untuk mengidentifikasi keanekaragaman spesies tumbuhan pangan dan tumbuhan obat yang dimanfaatkan oleh masyarakat minang di Kampung Simpang Alahan Mati. Data pengetahuan pemanfaatan spesies tumbuhan pangan dan obat masyarakat Simpang Alahan Mati diperoleh melalui metode wawancara snowball. Teridentifikasi 99 spesies tumbuhan pangan dari 44 famili dan 101 spesies tumbuhan obat dari 48 famili yang dimanfaatkan oleh masyarakat Simpang Alahan Mati. Tumbuhan obat yang dimanfaatkan masyarakat dikelompokkan menjadi 22 manfaat obat.
Keyword: Etnobotani, keanekaragaman spesies, tumbuhan pangan, tumbuhan obat, masyarakat tradisional

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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