Judul: Analisis Potensi Pengembangan Peternakan Rakyat Sapi Potong di Kabupaten Garut (Studi Kasus: Peternakan Kecamatan Malangbong)
Abstrak: Development of beef cattle breeding need to be conducted in order to fulfill the public demand of beef. The necessary informations to conduct the development of beef cattle breeding are the breeding's potential in every region and economic activities of the farmers in the region. The results of this research declare that farming activities in Kecamatan Malangbong with LQ analysis amounted 6.34 which means it is the highest breeding activities in Kabupaten Garut. The total cost of a private enclosure with a farmers amounting to IDR 30 313 639 and communal cages of IDR 29 710 747. Private cage breeders net income amounting to IDR 6 436 361 with R/C ratio of 1.21 and earning ratios of 21 percent. While the profits communal cages breeders amounted to IDR 7 039 253 with R/C ratio of 1.24 and earning ratios of 24 percent. Calculation of effective KPPTR in Kecamatan Malangbong produce a negative value of -3 150.99. Calculations obtained from the difference between the Maximum KPPTR Livestock Population Unit in Kecamatan Malangbong. Negative result means Kecamatan Malangbong is not able to accommodate the number of ruminant livestock, especially cattle. Then the development of should be implemented in other regions that have a positive KPPTR.
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Judul: Potensi Limbah Tanaman Pangan di Kabupaten Garut Jawa Barat untuk Pengembangan Budidaya Ternak Sapi Perah
Abstrak: Kabupaten Garut merupakan salah satu penyumbang produksi pertanian terbesar di Jawa Barat, sehingga juga memproduksi limbah pertanian yang dapat digunakan untuk sumber pakan. Penelitian ini bertujuan untuk mengidentifikasi limbah pertanian untuk pakan ternak sapi perah berdasarkan kuantitas dan potensi produksi limbah kabupaten menggunakan IKPP (Indeks Konsentrasi Produksi Pakan), mengidentifikasi kualitas nutrisi limbah pertanian, menentukan kapasitas tampung pengembangan sapi perah berdasarkan ketersediaan limbah pertanian sebagai sumber hijauan pakan ternak di Kabupaten Garut. Metode pengumpulan data primer diperoleh dari survey langsung, dan data sekunder dari dinas terkait. Hasil analisa potensi jumlah ketersediaan limbah yang besar berdasarkan nilai IKPP untuk pengembangan sapi perah berada di sembilan kecamatan yakni Bungbulang, Banjarwangi, Limbangan, Malangbong, Bayongbong, Pamulihan, Banyuresmi, Kadungora, dan Karangpawitan. Limbah pertanian terdiri dari empat komoditas yang digunakan sebagai pakan di Kabupaten Garut yaitu padi, jagung, ubi jalar, dan kedelai, jumlah produksi total limbah segar adalah 87 314.21 ton tahun-1 BK, 7 001.8 ton tahun-1 PK, 30 985.17 ton tahun-1 TDN. Jumlah efektif untuk penngembangan sapi perah yaitu berdasarkan ketersediaan total digestible nutrient 15 709 dan perbandingan pengembangan ternak sapi perah dengan jumlah ternak yang sudah ada adalah 5.45 kali lipat.
Keyword: Potensi pakan, Kapasitas tampung, Sapi perah

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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