Judul: Analisis efisiensi produksi dan peran koperasi terhadap usaha ternak Sapi Perah di Kecamatan Cibungbulang Kabupaten Bogor
Abstrak: Indonesia has a potency to develops the dairy industry in the future, however Indonesia still imports about 73% of its dairy need and produces the 27% remaining domestically (Kementerian Pertanian, 2013). Kawasan Usaha Ternak (KUNAK) Cibungbulang, Bogor District is purposively established by the Koperasi Peternak Susu (KPS) Bogor as a national pilot area of an environmentally friendly dairy farm. Further, it is also expected that its milk production can support national milk supply. However, as the milk production in KUNAK Cibungbulang still highly depends on the input usage, therefore the influencing factors of milk production analyses are interesting to be examined. Moreover, this study also analyses the farmer’s income level, the optimum input usage, and also the dairy cooperative’s role in supporting the farmer’s activity. This study applies the double linear regression which has been transformed into the natural logarithm form, the farm management income analysis, the efficiency analysis of production factor, and the descriptive analysis. The result of the study indicates that the significant production factors which influence the milk production are: the amount of the feed, concentrate, tofu dregs, and workers. The analysis is resulting an evidence of profitable dairy farm. However, it is also important to increase the usage of optimum input and the cooperative roles, thus the KUNAK Cibungbulang can reach its optimum profit. The research found that inputs farm have not been used optimally, even the dairy cooperatives have supported the farms well.
Keyword: Bogor Agricultural University (IPB), optimum input, production factor, milk production, cooperative

Judul: Analisis Pendapatan dan Peran Koperasi Terhadap Usaha Ternak Sapi Perah di Kabupaten Bogor.
Abstrak: Kabupaten Bogor merupakan sentra populasi sapi perah terbesar keempat di Jawa Barat. Salah satunya keberadaan Kawasan Usaha Peternakan (KUNAK) yang berlokasi di Kecamatan Cibungbulang dan Kecamatan Pamijahan. KUNAK merupakan kawasan usaha sapi perah dibawahi langsung oleh Koperasi Produksi Susu (KPS) Bogor. Usaha ternak sapi perah tidak terlepas dari faktor produksi seperti pakan ternak. Harga pakan yang meningkat berpengaruh terhadap biaya yang dikeluarkan peternak. Tingginya harga pakan dan rendahnya produksi susu akibat penggunaan input yang belum optimal berpengaruh pada pendapatan peternak. Penelitian ini bertujuan untuk menganalisis pendapatan usaha ternak sapi perah, faktor-faktor yang memengaruhi produksi usaha ternak sapi perah, peran koperasi terhadap usaha ternak sapi perah dan persepsi anggota koperasi terhadap pelayanan KPS Bogor. Metode yang digunakan dalam penelitian ini adalah analisis pendapatan, fungsi produksi Cobb-Douglas, analisis deskriptif, dan skala likert dengan jumlah responden sebanyak 50 orang. Hasil penelitian ini menunjukkan bahwa pendapatan peternak dari setiap skala usaha menguntungkan. Faktor-faktor yang memengaruhi produksi usaha ternak sapi perah yaitu pakan konsentrat dan jumlah sapi laktasi. KPS Bogor menjalankan perannya dalam memberikan pelayanan terhadap usaha ternak sapi perah yang dijalankan anggota. Persepsi anggota koperasi terhadap pelayanan KPS Bogor secara keseluruhan dalam kategori baik.
Keyword: fungsi produksi, pendapatan, skala likert, usaha 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.
Keyword: