Judul: Identifikasi Hijauan Makanan Ternak dan Analisis Potensi Wilayah untuk Pengembangan Usaha Peternakan Domba di Pesisir Pantai Utara Kecamatan Gebang, Kabupaten Cirebon, Provinsi Jawa Barat
Abstrak: Selain digunakan untuk areal hutan pantai dan pariwisata, kawasan pesisir pantai juga dapat kita manfaatkan untuk pembukaan lahan peternakan terutama peternakan domba. Penelitian ini bertujuan untuk mengidentifikasi rumput lokal yang tumbuh di pesisir pantai utara Kecamatan Gebang serta menganalisis potensi wilayah pesisir pantai utara Kecamatan Gebang guna pengembangan usaha peternakan ruminansia khususnya ternak domba dengan menggunakan analisis SWOT dan anlisis Kapasitas Penambahan Populasi Ternak Ruminansia (KPPTR) berdasarkan Nell dan Rollinson. Hasil dari analisis komposisi botani berdasarkan metode “dry weight rank” menunjukkan bahwa hijauan lapang yang paling banyak terdapat pada zona-1 adalah Xerochloa cheribon (57,03%), komposisi botani hijauan lapang pada zona-2 didominasi oleh rumput Cynodon dactylon (41,83%), sedangkan pada zona-3, hijauan lapang yang paling mendominasi berdasarkan komposisi botani adalah Paspalum conjugatum (paitan) dengan persentasi komposisi botani sebesar 43,39%. Hasil analisis KPPTR Nell dan Rollinson menunjukkan bahwa Kecamatan Gebang masih memiliki potensi penambahan ternak ruminansia sebanyak 862,87 satuan ternak atau dengan kata lain penambahan populasi ternak domba dewasa yang dapat dilakukan di Kecamatan Gebang adalah sebanyak 6235 ekor. Berdasarkan analisis SWOT, Kecamatan Gebang berada pada posisi agresif, sehingga strategi yang harus dilakukan dalam pengembangan ternak ruminansia adalah mendukung kebijakan pertumbuhan yang agresif.
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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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