Judul: Sistem pemeliharaan dan produktivitas sapi potong pada berbagai kelas kelompok peternak di Kabupaten Ciamis
Abstrak: The research was conducted to study farming system and productivity of beef cattle from different farming groups (pemula, lanjut and madya) in Ciamis. The study was meld on July until December 2007. The research metodology included observation and interview based on questioner againts 75 farmers. The qualitative data was analysis using descriptive analysis, while the quantitive data was computed using t-Student test and Chi Square test. The research showed the differences ocured between farming groups on production management and productivity of bef cattle. The farming group of madya level showed better production management and productivity of beef cattle, compared with the other farming groups (Pemula and Lanjut) level
Keyword: 

Judul: Potensi dan Ketersediaan Limbah Pertanian untuk Mendukung Pengembangan Budidaya Ternak Sapi Potong di Kabupaten Ciamis
Abstrak: Kabupaten Ciamis merupakan salah satu kabupaten di Jawa Barat yang memiliki potensi untuk pengembangan budidaya ternak sapi potong. Limbah pertanian dapat dimanfaatkan sebagai alternatif dalam penyediaan hijauan pakan untuk mendukung pengembangan sapi potong. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis kualitas nutrien limbah pertanian yang digunakan, menentukan kecamatan yang potensial untuk pengembangan ternak sapi potong berdasarkan indeks konsentrasi produksi pakan (IKPP) dan menghitung kapasitas peningkatan populasi ternak ruminansia (KPPTR) khususnya sapi potong di Kabupaten Ciamis, Jawa Barat. Pengumpulan data menggunakan data primer yang diperoleh dari kuisioner terstruktur dan data sekunder diperoleh dari data badan pusat statistik (BPS) serta dinas terkait. Hasil penelitian terdapat dua macam limbah pertanian yang digunakan di kabupaten Ciamis yaitu jerami padi dan batang pisang. Hasil perhitungan IKPP kecamatan yang berpotensi untuk dikembangkan sebagai sentral peternakan sapi potong adalah Kecamatan Purwadadi, Lakbok, Langkaplancar, Cijulang, Padaherang, Cimerak, Parigi, dan Cigugur…
Keyword: Agricultural by-product, Beef cattle, Ciamis district, Forage supply, Nutrient quality, FPCI, CERPE, CSA, RICE straw

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: