Judul: Etnobotani dan potensi tumbuhan berguna di Taman Nasional Gunung Ciremai, Jawa Barat
Abstrak: The people around TNGC have a very close interaction with the surrounding natural resources as can be seen when they deal with the use of plants (ethnobotany). Documenting the people‟s knowledge in TNGC ethnobotany is especially important so that the knowledge of TNGC people in the use of these plants can be preserved. This study aimed to identify the use of plants by the people around TNGC (etnobotany) and to find out the potential of useful plants in the TNGC region. Ethnobotany study was conducted by interviews and the potential of useful plants in the TNGC region was learned through a vegetation analysis. The number of species obtained from the ethnobotany results was 131 species and 62 families. Medicinal plants were among the much used reaching 37 species. The number of spesies obtained from the results of vegetation analysis was 99 plant spesies and 43 families residing in the TNGC area. The most useful plant species were plants producing buildings as many as 14 species. Out of 131 plant that were used by community, many them were not be found in the area of TNGC reached 113 species, whereas plants that were aas many as 18 species. Of all the plants obtained from the ethnobotany results and vegetation analysis, 10 superior species can be develoved by communities around the TNGC area, for example, nilam (Pogostemon cablin) as aromatic material and raw material for the manufacture of perfume and ground orchids with yellow flowers (Phaius flavus ) for ornamental plants. These superior species if well-cultivated are expected to help TNGC community improve their income.
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Judul: Etnobotani Masyarakat Sekitar Kawasan Cagar Alam Gunung Simpang (Studi Kasus di Desa Balegede, Kecamatan Naringgul, Kabupaten Cianjur, Jawa Barat).
Abstrak: The relationship between human and their environment, especially related to the use of plants known as ethnobotany. Plants utilization by local communities that based on local culture produced typical knowledge known as traditional knowledge. A change in lifestyle of a society can threaten the existence of traditional knowledge held by the community. This study aimed to determine the type of plants utilization and traditional knowledge in the form of plants used by communities in the surrounding area of Gunung Simpang Nature Reserve. This research was conducted at Miduana Hamlet, Balegede Village, Naringgul Subdistrict, Cianjur Regency, West Java in January, February, and May 2010. Tools and materials used in this study include questionnaires, digital camera, transparent plastic size 40x60 cm, newspapers, hanging labels, plant identification books, alcohol 70%, the data area of Gunung Simpang Nature Reserve, and demography of Balegede Village, while the object was Miduana Hamlet’s community and surrounding vegetation. Data collected include primary and secondary data. Primary data included the data of plants used by the respondents. This data was collected through semi-structured interviews on 30 respondents, direct observation, and making herbarium. Respondents selected using snowball sampling technique. The secondary data included the condition of Gunung Simpang Nature Reserve and demography of Balegede Village. Data analysis was performed by classifying the use of plants to 13 groups of usage, calculating the percentage of habitus and the percentage of parts used, and analyzes preference ranking and use value. The communities of Miduana Hamlet used 191 plant species from 69 families that classified into 13 group of usage. They used 62 species for food, 74 species for medicinal purpose, 43 species for ornament purpose, 19 species for indigenous utility, 14 species for building materials, 12 species for cattle feeding, 12 species for aromatic purpose, 9 species for firewood, 14 species for ropes, wickerwork, and crafts, 4 species for dyes, 4 species to exceed pest, 4 species for beverage, and other uses as many as 7 species. Although traditional knowledge of plants used in Miduana Hamlet already decrease, there were some people who still keep the values of traditional knowledge that was visible from the activities of plants used, conservation efforts to utilized plant, and still doing some traditions related to respect for the rice (Oryza sativa).
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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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