Judul: Analisis Faktor-faktor yang Mempengaruhi Risiko Produksi Ayam Broiler di Kabupaten Serang.
Abstrak: Kabupaten Serang mengalami peningkatan jumlah populasi ayam broiler sebesar 1.307 persen pada tahun 2015. Akan tetapi, produksi pada tahun tersebut menurun sebesar 2.29 persen dari tahun sebelumnya. Peningkatan mortalitas dan penurunan jumlah produksi mengindikasikan terjadinya risiko produksi yang dihadapi oleh para peternak di Kabupaten Serang. Penelitian ini bertujuan untuk menganalisis pengaruh faktor-faktor produksi terhadap risiko produksi ayam broiler yang dihadapi oleh peternak di Kabupaten Serang. Penelitian ini mengambil 32 sampel dari peternak responden di Kabupaten Serang dengan menggunakan purposive sampling sebagai metode penentuan sampel sedangkan metode analisis data menggunakan model Just and Pope. Berdasarkan hasil perhitungan, ditunjukkan bahwa peningkatan penggunaan DOC dan pakan secara nyata dapat meningkatkan risiko produksi (risk inducing factors) sedangkan peningkatan penggunaan tenaga kerja secara nyata dapat menurunkan risiko produksi (risk reducing factors). Sementara itu, faktor produksi lainnya seperti obat, vaksin, bahan bakar, dan sekam tidak berpengaruh nyata terhadap produksi ayam broiler.
Keyword: ayam broiler, Just and Pope, risiko produksi

Judul: Analisis Risiko Produksi Pada Usaha Peternakan Ayam Broiler Bermitra dan Mandiri di Kabupaten Serang Propinsi Banten
Abstrak: One of the many farms which has the potential national meat contribution is broiler chickens farm. Serang Regency is one of the broiler production centers in Banten, and it encourages the emergence of partner companies. PT.Berkah Mitra Sejahtera is a company which forms a partnership with three broiler poultrymen in Serang District. There are few independent broiler chicken farms there. The aim of the study was to identify the sources of the farm production risks of the independent or contract farming, to analyze the likelihood of the risks and impacts of farm production risk sources,to compared risks production broiler chicken farm of independent or contract farming, to analyze and to analyze alternative strategies to handle the farm producton risk sources. There were four farm production risk resources found in the contract farming farms i.e, diseases whose average probability was 39.43 percent, weather changes - 31.93 percent, poorer DOC quality - 24.23 percent, and predators - 12.90 percent. Similiarly there were also four farm production risk resources found in the independent poultryman’s farm, i.e diseases whose probability of which was 50.00 percent, weather changes - 46.40 percent, predators - 23.30 percent, and poorer DOC quality - 18.10 percent.Based on t-test showed the risk production being largest for contract farming because p-value >α=0.05,so that no reject Ho. Risk mapping results indicate that there were two strategies, namely preventive and mitigation strategies. Diseases were a source of risk that had the highest possibility and the greatest impact.
Keyword: Bogor Agricultural University, Production ris, Independent, Contract Farming, Broilers

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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