Judul: Diversity of Local Forage for Goats in Pidoli Lombang and Aek Banir Village, Panyabungan Subdistrict, Mandailing Natal Regency, North Sumatera
Abstrak: Bentuk topografi dan dinamika sosial yang berbeda di antara Desa Pidoli Lombang dan Aek Banir mempengaruhi sistem beternak yang diterapkan masyarakat. Desa Pidoli Lombang yang memiliki topografi datar dan lebih dekat dengan ibukota kecamatan menerapkan sistem pemeliharaan ternak kambing secara intensif. Sementara Desa Aek Banir yang memiliki tofografi berbukit dan terletak jauh dari ibukota kecamatan menerapkan sistem pemeliharaan ternak kambing secara semi intensif. Penelitian dilaksanakan di peternakan kambing rakyat Desa Pidoli Lombang dan Aek Banir. Metode yang digunakan adalah observasi langsung difokuskan pada pengamatan kandang kambing, memprediksi komposisi botani di kandang ternak, menimbang hijauan pakan yang diberikan pada ternak, menimbang ternak dewasa, wawancara dengan peternak dan pemotretan untuk dokumentasi. Pengamatan pemberian hijauan per hari hanya di lakukan di Desa Pidoli Lombang dengan sistem pemeliharaan intensif dengan menggunakan sampel 40 ekor kambing dari 4 orang peternak. Desa Pidoli Lombang memiliki 3 jenis kambing yaitu kambing Benggala, kambing Peranakan Benggala-Lokal dan kambing Kacang Lokal. Hijauan pakan diberikan peternak terbagi atas 3, yaitu kacangan (5 jenis), rumput (3 jenis) dan ramban (6 jenis). Spesies jenis kacangan yaitu Gliricidia sepium Jacq. Kunth ex. Walp, Leucaena leucocephala LAMK, Centrosema pubescens Benth, Pueraria javanica Benth. dan Calopogonium mucunoides Desv. Jenis rumput yaitu Brachiaria mutica Forssk, Panicum maximum Jacq var. Gatton dan Chloris barbata Swartz. Jenis ramban yaitu Manihot utillissima POHL, Ipomoea batata (L). Lam, Artocarpus heterophylus LAMK, Mikania micrantha HBK, Mangifera indica L. dan Ipomoea aquatic Forssk. Desa Aek Banir memiliki satu jenis kambing yaitu kambing Kacang Lokal. Jenis hijauan pakan diberikan peternak terbagi atas 3 yaitu kacangan (5 jenis), rumput (2 jenis) dan ramban (5 jenis). Jenis kacangan yaitu Gliricidia sepium Jacq. Kunth ex. Walp, Leucaena leucocephala LAMK, Centrosema pubescens Benth, Calliandra calothyrsus Meissn dan Calopogonium mucunoides Desv. Spesies jenis rumput yaitu Brachiaria mutica Forssk dan Cynodon dactylon L. PERS. Spesies jenis ramban yaitu Manihot utillissima POHL, Mikania micrantha HBK, Arenga pinnata (Wurmb) Merr, Lantana camara LINN dan Eugenia aquena BURM.f.
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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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