Judul: Kajian Etnobotani Masyarakat Kasepuhan Sobang di Kabupaten Lebak, Banten
Abstrak: Ethnobotany is one tool to discover many plants which are used by traditional community to support their livelihood. This research is aimed to investigate knowledge of local communities in managing biological resources, diversity, the way of using and proliferating that plants. The data were obtained through participant observation method and semi-structured interviews of 38 respondents by using an interview guide and questionnaire. Data of plant diversity was obtained through sampling and identification of plant species. There were 203 species (classified into 70 families) used by Kasepuhan Sobang communities. The most useful plant for traditional communities belongs to Fabaceae. The most utilization of plant diversity was as source of food (93 species, 39.74 %) and medical plant species (54 species, 23.07 %). Most of the plants were taken from the gardens and used immediately. Leaves were the largest part of plant that used to support communities livelihood, most of the plants are harvested monthly. The application of ethnobotany knowledge in Sobang Kasepuhan society in managing forest was demonstrated by dividing zone Kasepuhan Sobang into several utilization areas.
Keyword: traditional knowledge., local wisdom, leuweung tutupan, kasepuhan sobang, ethnobotany

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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