Judul: Pengetahuan Masyarakat dalam Pemanfaatan Hasil Hutan Bukan Kayu (HHBK) Di Kawasan Cagar Alam Gunung Sibela
Abstrak: Community living around Gunung Sibela Nature Reserve depend on its products mainly to fulfill their needs. They develop knowledge to utilize forest resources including Non-Timber Forest Products (NTFPs). The objectives of this research are to describe people’s knowledge of NTFPs and explaining factors that influence pattern of NTFPs utilization. The method used in this research was survey. Data were collected with interview, observation, and secondary data collection. The results show that NTFPs collected by local people comprises of medicinal plants, yarn and handcraft-produce plants, crops, ornamental plants, and group of hunted animals. They utilize NTFPs to fulfil their daily needs and earn more income. Age, education, and work do not influence pattern of NTFPs utilization by local people
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Judul: Kajian Pemanfaatan Sumberdaya Hutan di Taman Nasional Gunung Halimun Salak oleh Masyarakat Sekitar
Abstrak: Forest product utilization by communities in Taman Nasional Gunung Halimun Salak (TNGHS) faced the fact that TNGHS is one of the Conservation areas that are restricted by regulation. The utilization activities allowed only on certain zones.Meanwhile, local community has been utilized forest resources since long time ago, even before TNGHS established yet not known whether the utilization has been following the rules of TNGHS or not.Therefore, it is necessary to know the characteristics of forest utilizations by local community. Once known the characteristic of utilization by the public, then we could be formulated strategies for the utilization of forest products in a sustainable way.The utilization of forest products by the community around TNGHS especially in Hanjawar village, Majasarivillage and Kutajayavillage used used for daily needssuch as food needs, boards, medicines, household equipment, firewood and fodder. There are 103 species of forest products that are utilized. Utilization only done by local communities.The location of the utilization gone into the 5 zone namely special zone, jungle zone, rehabilitation zone, utilization zone and traditionalzone.
Keyword: utilization, local community, Gunung Halimun Salak National Park, forest product

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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