Judul: Pengaruh Kemitraan Terhadap Risiko Produksi Usahaternak Ayam Broiler di Kecamatan Pamijahan Kabupaten Bogor
Abstrak: Kecamatan Pamijahan merupakan sentra produksi daging ayam broiler, namun peternak menghadapi risiko produksi dan melakukan upaya untuk meminimalkan dengan kemitraan. Tujuan penelitian ini adalah untuk menganalisis pengaruh faktor-faktor produksi terhadap risiko produksi ayam broiler, menganalisis tingkat risiko, dan menganalisis pengaruh kemitraan terhadap risiko produksi usahaternak ayam broiler di Kecamatan Pamijahan Kabupaten Bogor. Pengambilan responden untuk penelitian ini menggunakan metode simple random sampling untuk peternak mitra dan metode sensus untuk peternak non mitra dengan jumlah masing-masing peternak adalah 30 responden. Penelitian ini menggunakan analisis model Just and Pope untuk mengetahui pengaruh faktor produksi terhadap risiko produksi dan analisis tingkat risiko untuk mengetahui besar risiko yang dihadapi peternak. Hasil penelitian ini menunjukkan bahwa variabel yang berpengaruh nyata terhadap produktivitas ayam broiler adalah pakan, obat-obatan, vitamin, dan dummy kemitraan, sedangkan dalam fungsi variance produktivitas, variabel yang berpengaruh nyata adalah vitamin dan sekam. Analisis tingkat risiko menunjukkan bahwa risiko yang dihadapi peternak mitra lebih kecil dibandingkan peternak non mitra. Kemitraan memiliki pengaruh yang tidak signifikan menurunkan risiko produksi peternak ayam broiler.
Keyword: ayam broiler, kemitraan, risiko produksi

Judul: Risiko Produksi Ayam Ras Pedaging Pada Peternakan di Kecamatan Pamijahan Kabupaten Bogor, Jawa Barat
Abstrak: Husbandry is one of the agricultural sector which has a potential to be developed. One of the many husbandry commodities grown in Indonesia, especially in West Java is broiler. Similarly with other agribusiness, broiler husbandry also has risk especially production risk which seen from the chicken mortality at each production period. This research objectives are to indentify production risk sources, to analyze the sources’s probability and impacts, and to determine alternative strategy due to reduce the risk probability and impacts. To reach the research objectives, this research use several method such as Z-score and Value at Risk (VaR). Production risk sources at broiler husbandry in Kecamatan Pamijahan are weather, pests and predators, disease, and environmental disorders. According to probability the source which has the biggest probability is pests and predators and the lowest probability is environmental disorders. The biggest impact caused by disease and the lowest impact caused by environmental disorders.
Keyword: risk mapping, broiler, Production Risk

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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