Judul: Analisis Pola Penyediaan, Ketersediaan, dan Jenis Vegetasi Hijauan Pakan pada Peternakan Sapi Perah di KUD Mandiri Cipanas, Kabupaten Cianjur, Jawa Barat
Abstrak: KUD Mandiri Cipanas is a corporation which organized dairy farmers from districts in Cianjur, which are Cipanas, Sukaresmi, and Pacet. The aim of this research was to evaluate and analize the pattern of forage management based on the level of ownership of forage, forage potential, diversity analysis, and three types of forage in the three districts. This study used descriptive analysis, forage botanical composition analysis, capacity analysis of location based on Nell and Rollinson methods, and vegetation analysis. Pattern of forage management dairy cattle in KUD Mandiri Cipanas is cut and carry. Based on population of dairy cattle, avaibility of foragenon large and medium farms are from grass land farm (GRF), and tropical grass for small farms. There is no correlation between cutting capacity and ownership of livestock. The most dominant in enclosure is Penisetum purpureum Schum, while the rumbah grass dominant on the land
Keyword: forage, diversity analysis, dairy cattle, composition botany, carrying capacity

Judul: Produktivitas Tenaga Pengarit dan Komposisi Hijauan Pakan Domestik di Peternakan Sapi Perah Pondok Ranggon, Kecamatan Cipayung, Jakarta Timur
Abstrak: Pondok Ranggon farm is one of the dairy farms in Jakarta where the pattern of availability forage depending on natural pastures. The aim of this experiment were to analyze labor productivity of grass seekers and to identify the composition of domestic forage in the dairy farm of Pondok Ranggon. This experiment used descriptive analysis, composition of botany and Nell and Rollinson method. The result showed that the capacity of grass seekers influenced by body weight, age and experience of cutting. The result showed, the highest capacity of cutting obtained by grass seekers in the age of 40 years old. Composition of forage consist of 52.63% grasses, 15.79% legumes and 31.58% rumbah. The most frequent type of grass that used were Imperata cylindrica (LINN.) P.Beauv., Pennisetum polystachyon (L.) Schult., and Panicum maximum Jacq. Type of legumes that often used was Calopogonium mucunoides Desv. and the types of rumbah that most commonly used were Asystasia coromodeliana Ness., Biden pilosa L. and Lantana camara L.
Keyword: legume, leaves, grass, cutting, composition of forage

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.
Keyword: