Judul: Pemanfaatan Tumbuhan Obat Pada Masyarakat Kampung Sekitar Kawasan KHDTK Haurbentes Jasinga Bogor
Abstrak: Area KHDTK ( Kawasan Hutan Dengan Tujuan Khusus ) Haurbentes is the forest that function as forest research. In land research forestry there are various kinds of herbs often used by community as a drug to cure diseases. With respect to such matters, then this research was conducted. The aim of this research is to identify plant species drug used of the surrounding community research KHDTK Haurbentes forest area. This research carried out in 2 town about are in Haurbentes town and Cikeusal Wirajaya village. Research is done in February to March 2014. Based on research, characteristic of community dominated by the use of medicinal herbs age 50-60 years, education has elementary education, and society most much use of medicinal herbs freelance. Plant species identified as much as 21 species of the family 16 that can be used by local community as an alternative medicine. This type of the disease ever suffered by the people around KHDTK Haurbentes there are 15 groups of diseases/use of medicinal plants which are exploited by the community.
Keyword: Bogor Agricultural University (IPB), medicinal plants, KHDTK Haurbentes, diseases, community

Judul: Pemanfaatan Tumbuhan oleh Masyarakat di Sekitar Hutan Pendidikan Gunung Walat Sukabumi
Abstrak: Society, which lives in forest margin area such as one in Hegarmnah Village, Cicantayan, Sukabumi, has interaction with forest. The changing lifestyle of the society threaten the existence of their traditional knowledge. This research needed to identified the diversity of plants used by forest margin society of GWUF. Data of used plant diversity were collected through semi-structured interview. Plant species was classified into 8 group of purpose, that is for medicinal purpose, food, aesthetics, fire-wood, building materials, cattle feeding, aromatic, and other purpose. Medicinal purpose plant is the most group used plants, amount of 145 species of 54 family. Herb habitus is the most used plants by a value of 36,56%. Plant’s part that mostly used by the people was the leaves with the amount of 51,61% since leaves were easy to obtain and process
Keyword: Bogor Agricultural University (IPB), plant use, Hegarmanah village society, Gunung Walat University Forest

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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