Judul: Risiko Produksi Pendederan Ikan Hias Black Ghost pada Anggota Kelompok Tani Batara Mina Sejahtera di Kecamatan Bogor Utara
Abstrak: Ornamental fish is one of the potential fishery commodities which has some advantages than other fish. Black Ghost is one of the export ornamental fish commodities and has a potential business opportunity. One of the farmer groups in Bogor city is Batara Mina Sejahtera (BMS). The problem faced by BMS is different fish survival rate from the Black Ghost fish mortality. This research objectives are to identify production risk sources, to analyze the production status of risk, and to determine handling alternative to reduce the Black Ghost nursery production risk. This research use several method such as descriptive analyze, z-score, and Value at Risk. Sources of production risk in Black Ghost nursery of BMS members at North Bogor is different survival rate between farmer because mortality from water quality, seed quality, diseases, and human resources. The highest status risk production is water quality and the lowest risk sourcers is human resources. The handling alternative which can reduce of risk production are preventive and mitigation.
Keyword: production risks, ornamental fish, Black Ghost

Judul: Risiko Produksi Ikan Hias pada PT Qian Hu Joe Aquatic Indonesia di Kabupaten Bogor, Provinsi Jawa Barat
Abstrak: Ikan hias merupakan komoditas perikanan yang cukup prospektif untuk dikembangkan karena memiliki nilai ekonomis yang tinggi. Dalam pelaksanaan usaha ikan hias tidak terlepas dari adanya risiko usaha. Penelitian ini dilakukan untuk mengidentifikasi sumber-sumber risiko produksi pembesaran ikan hias yang dihadapi PT. Qian Hu Joe Aquatic Indonesia, menganalisis hubungan antara diversifikasi usaha dengan upaya meminimalkan risiko, serta memberikan alternatif strategi yang memungkinkan dalam penanganan risiko produksi yang dihadapi perusahaan. Metode analisis yang digunakan dalam penelitian ini adalah analisis varian, standar deviasi, koefisien variasi, dan expected return. Penelitian ini memberikan informasi bahwa sumber-sumber risiko produksi yang dihadapi perusahaan diantaranya kondisi iklim dan cuaca, serangan penyakit, dan kesalahan tenaga kerja. Hasil analisis risiko pada komoditas tunggal diperoleh risiko yang paling tinggi adalah ikan clown loach, nilai risiko yang paling rendah adalah ikan black ghost. Hasil analisis risiko diversifikasi diperoleh nilai risiko paling rendah pada kombinasi ikan black ghost dan silver arowana. Alternatif strategi yang dapat dilakukan perusahaan dalam mengurangi risiko produksi adalah melakukan diversifikasi produksi dan kemitraan.
Keyword: ikan hias, risiko diversifikasi, risiko produksi.

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: