Judul: Analisis Risiko Portofolio Produksi Hortikultura Di Puncak Berry Farm Agrowisata Cipanas, Kabupaten Cianjur, Jawa Barat
Abstrak: Puncak Berry Farm merupakan perusahaan yang bergerak di bidang agribisnis sekaligus agrowisata. Usaha yang dijalankan oleh Puncak Berry Farm menghadapi permasalahan produksi yang menyebabkan produktivitas stroberi dan sayuran yang diusahakan mengalami fluktuasi yang mengindikasikan adanya risiko dalam usahanya. Tujuan penelitian ini adalah menganalisis risiko produksi dalam pengelolaan stroberi dan sayuran pada kegiatan spesialisasi dan portofolio (diversifikasi) yang dilakukan Puncak Berry Farm dan menyusun alternatif strategi diversifikasi dengan menyajikan kombinasi komoditas yang tepat untuk mengurangi besarnya risiko pada kegiatan diversifikasi yang dilakukan Puncak Berry Farm. Hasil analisis risiko pada kegiatan spesialisasi diperoleh risiko yang paling tinggi terdapat pada stroberi sedangkan yang paling rendah terdapat pada pakcoy. Sedangkan, hasil analisis risiko diversifikasi menghasilkan kombinasi stoberi dan brokoli merupakan diversifikasi yang paling tinggi risikonya, sedangkan risiko yang paling rendah adalah stroberi dengan daun bawang.
Keyword: stroberi, sayuran, risiko, spesialisasi, diversifikasi

Judul: Optimalisasi Produksi Stroberi dan Sayuran Pada Puncak Berry Farm Agrowisata Cipanas, Kabupaten Cianjur, Provinsi Jawa Barat
Abstrak: Puncak Berry Farm is an agribussiness company in west java that developed the business of strowberries and vegetables cultivating for the needs of its agrotourims. The study aimed to analyze the combination of productions that bring in the optimal return. The analysis method that used in this study is Linnear Programming (LP) which from the models of goals and abstacles function. The result shows that the residual value of polybag that used for production, in the actual condition the value greater that zero, while the residual value on the optimal condition is zero. In the other side, the resource on the optimal condition shows the excess, it seen from the slack or surplus value that greater that zero.
Keyword: Bogor Agricultural University (IPB), vegetable, stroberries, production optimalization, agrotourims

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: