Judul: Anal isis Risiko Diversifikasi Sayuran Organik Pada The Pinewood Organic Farm di Bogor, Jawa Barat
Abstrak: Vegetables as one of the parts of the horticulture and have a business opportunity if managed properly. Vegetables is one of the organic agricultural products of environmental friendly nature and get closer to nature concept, so as to provide a good quality assurance compared to conventional vegetables. Besides having the advantages of environmentally friendly farming organic vegetables have a pretty big obstacle is the high level of risk, including the risk of production. The purpose of this study was to analyze the activities of specialization and develop alternative strategies commodity diversification by presenting the right combination to reduce the magnitude of the risk of farming in the specialization of activities. Meanwhile, the risk measure used include opportunities, expected return, variance, standard deviation, and coefficient of variation. The results of the analysis indicate that the specialization of activities Broccoli is a commodity with the lowest coefficient of variation is equal to 0.17. The combination of Broccoli and Carrots are the most diversified activities lower risk than other commodity combinations
Keyword: Diversification, Risk, Organic, Horticulture

Judul: Analisis Risiko Produksi Sayuran Organik pada KebonKu Farm di Kabupaten Bogor Provinsi Jawa Barat
Abstrak: KebonKu Farm merupakan perusahaan yang bergerak dibidang agribisnis, khususnya budidaya sayuran organik. Dalam melakukan usaha budidaya organik KebonKu Farm menghadapi masalah produksi yang menyebabkan tingkat produktivitas sayuran organik yang diusahakan berfluktuasi yang mengindikasikan bahwa KebonKu Farm mengalami risiko dalam usahanya. Tujuan penelitian ini adalah mengidentifikasi sumber-sumber risiko yang dihadapai KebonKu Farm, menganalisis risiko produksi dalam pengelolaan sayuran organik pada kegiatan spesialisasi dan diversifikasi, dan menganalisis alternative strategi yang dapat dilakukan KebonKu Farm untuk menangani risiko usahanya. Berdasarkan hasil analisis risiko pada kegiatan spesialisasi diperoleh risiko yang paling tinggi terdapat pada sayuran bayam jepang sedangkan yang paling rendah terdapat pada sayuran wortel. Hasil analisis risiko diversifikasi menghasilkan kombinasi paccoy dan bayam jepang merupakan diversifikasi yang paling tinggi risikonya sedangkan risiko yang paling rendah adalah wortel dengan paccoy.
Keyword: Organic vegetables, diversification, specialization, 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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