Judul: Identifikasi Jenis Hijauan Makanan Ternak di Kawasan Usaha Peternakan (KUNAK) Sapi Perah Kecamatan Cibungbulang dan Pamijahan Kabupaten Bogor
Abstrak: KUNAK is a dairy farm area which located at Cibungbulang and Pamijahan district, Bogor regency, it was built on 1995. The aim of this research was to identify types of forage of areas in KUNAK diversity analysis, and identification of its crude fiber and crude protein. This research used ArcGis application, descriptive analysis, proximate analysis, botanical composition analysis, and vegetation analysis. The result of botanical composition in KUNAK 1 is Ottochloa nodosa (Kunth) 11.83 %, Brachiaria ruziziensis Mez. 10.34 % and Pennisetum purpureum Schum. 8.88 %, while in KUNAK 2 Pennisetum purpureum Schum. 14.24 %, Ottochloa nodosa (Kunth) 13.37 % and Eleusine indica L. Gaertn 7.40 %. Based on vegetation analysis, vegetation diversity in KUNAK 1 and 2 were clasified as medium. The result of proximate analysis, crude protein (CP) and crude fiber (CF) Ottochloa nodosa (Kunth) were 9.1 % and 28.4 %, Brachiaria ruziziensis Mez. 7.4 % and 25.4 % and Pennisetum purpureum Schum. 8.6 % and 30.7 %.
Keyword: KUNAK, forage, dairy cattle, botanical composition

Judul: Jenis dan Kualitas Nutrisi Pakan di Peternakan Rakyat KUNAK Cibungbulang Bogor sebagai Dasar Penyusunan Formulasi Ransum
Abstrak: The research was aimed to identify type of feed that used by farmers in Cibungbulang Bogor and find out nutritional content as basis for formulation of feed rations. This study uses descriptive analysis to describe type and quality of feed used and T-test were used to compare quality of forage and agricultural waste in dry season and the rainy season. Type of forage used in KUNAK among others field grass, grass taiwan, king grass, hawaii grass, rice straw, corn husk, and cabbage waste. Concentrates used are tofu, tempe waste, rice bran, and concentrates. Formulation results based on the average performance of lactating cows using available feed, consisted of Taiwan grass 48%, and concentrates A from Bogor 18%, field grass 10%, rice bran 10% and 14% tempe waste. Formula contained 16.5% CP, 21.5 CF%, 70.6% TDN, 0.45% Ca and 0.28% P.
Keyword: season, forage types, feed nutrition, feed formulation

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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