Judul: Pemanfaatan Hijauan di Pematang Sawah di Desa Cihideung Udik, Cibitung Tengah, dan Situ Udik, Kabupaten Bogor, Jawa Barat
Abstrak: Dike in is considerable as forage potency. Forage growing around the dike in has been used by farmers, depend on people who sickling in the dike in. This study aimed to evaluate the potential of forage in dike in as forage source and potency local forage mapping also to evaluate the dike in changes. This study used botanical composition analysis, vegetation analysis, capacity improvement of ruminant livestock population, and area mapping. The results of botanical composition showed that Eleusine indica (L.) Gaertn., Ageratum conyzoides L., and Axonopus compressus (Sw.) P. Beauv. were the top three. The conclusion of the research conducted in the dike in at Cihideung Udik, Cibitung Tengah, and Situ Udik village are Brachiaria mutica (Forsk.) Stapf., Pennisetum purpureum Schumaker., and Eleusine indica (L.) Gaertn. are potential as forages source.
Keyword: dike in, forage potential, geographic information system, botanical composition

Judul: Analisis Potensi dan Pemanfaatan Hijauan Pakan pada Peternakan Domba Rakyat Desa Randobawa Ilir Kecamatan Mandirancan, Kabupaten Kuningan, Jawa Barat
Abstrak: Randobawa ilir is one of the villages in Kuningan Regency where found sheep breeding farm. The aim of this experiment was analyzing potential and utilitazion of forage on sheep breeding farm in Randobawa Ilir village as a feed of ruminant forage. This experiment used descriptive analysis, composition botany analysis, analysis of carrying capacity, and diversity analysis. The results of composition of botany showed that the first rank of forage was Eragrostis sp. as many as 14.01%, the second was Digitaria sp. as many as 9.96%, and the third was Mikania micrantha H.B.K. as many as 9.90%. The result of analysis of carrying capacity showed that Randobawa Ilir village still allowed for addition of livestock as many as 129.39 AU. The result of diversity analysis showed that diversity on paddy field higher than farm. The highest importance value on paddy field was Cynodon dactylon L. Pers. as many as 31.53% and the highest importance value on farm was Oplismenus burmannii (Retz.) P. Beauv as many as 68.64%.
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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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