Judul: Faktor-Faktor yang Mempengaruhi Praktik Manajemen Pemeliharaan Sapi Perah pada Peternak Pemasok Susu Segar Industri Keju di Kabupaten Sukabumi.
Abstrak: This research was aimed to determine the factors that influence the maintenance management practices in farms which supply fresh milk for cheese industry. This research was conducted from June 2011 to January 2012. The respondents were ten fresh milk suppliers. The data was collected by interviewing using questionnaires. The questionnaires contained some question’s about farmer’s characteristic, the maintenance management practices, and farmer’s knowledge about subclinical mastitis and how to control it. The result showed that profile of dairy cattle farmers which most age were between 30 until 50 years old, had educated from elementary school and junior high school, and had farming experience from 1-5 years and >10 years. Half of them had attending the extention program. All of dairy cattle (100%) showed positive reaction of subclinical mastitis with IPB-1 mastitis test. The result of observation showed that respondents with good maintenance management practice were 10%, while respondents with enough and poor maintenance management practices respectively by 30%, and 60%. The significant positive correlation with maintenance management practice (p<0.05) was found between farming experience, and attending the extention program.
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Judul: Good Management dan Milking Practices Menggunakan Analytical  Hierarchy Process pada Peternakan Sapi Perah Rakyat KPSBU Lembang
Abstrak: Sapi perah mempunyai kontribusi besar terhadap penentu kebutuhan susu setiap tahun yang terus meningkat. Penerapan Good Dairy Farming Practice (GDFP) dan Good Milking Practice (GMiP) berperan penting terhadap kualitas dan keamanan susu. Penelitian bertujuan mengetahui faktor penentu yang paling berpengaruh pada evaluasi GDFP pada aspek Good Management dan GMiP di peternakan sapi perah rakyat KPSBU Lembang dengan menggunakan analisis data Analytical Hierarchy Process (AHP). Metode yang digunakan yaitu metode survei dan wawancara langsung kepada 10 peternak di Manoko dan 10 peternak di Cisaroni yang merupakan anggota Koperasi Peternak Sapi Perah Bandung Utara (KPSBU) serta 4 orang ahli yang terdiri dari akademisi, praktisi, dan pemerintah. Hasil evaluasi Good Milking Practice (GMiP) pada aspek ketika pemerahan, aspek sebelum pemerahan, dan aspek setelah pemerahan berturut-turut memiliki nilai 3,85; 3,84; 3,79 serta hasil evaluasi GDFP aspek good management memiliki nilai 3,65. Kriteria yang paling diprioritaskan adalah pengeringan sapi laktasi dan yang paling tidak diprioritaskan adalah kriteria peralatan dan lantai. Kata kunci: GDFP, GMiP, sapi perah, Dairy cows have a major contribution to determining the demand for milk every year which continues to increase. The implementation of Good Dairy Farming Practice (GDFP) and Good Milking Practice (GMiP) plays an important role in the quality and safety of milk. The aim of this study was to determine the determinants that most influenced the evaluation of GDFP on the Good Management and GMiP aspects of the KPSBU Lembang small dairy farm by using the Analytical Hierarchy Process (AHP) data analysis. The methods used are survey methods and direct interviews with 10 farmers in Manoko and 10 farmers in Cisaroni who are members of the North Bandung Dairy Farmers Cooperative (KPSBU) and 4 experts consisting of academics, practitioners and the government. The evaluation results for Good Milking Practice (GMiP) aspects during milking, aspects before milking, and aspects after milking respectively have a value of 3,85; 3,84; 3,79 and the results of the evaluation of the GDFP aspect of good management have a value of 3,65. The most prioritized criteria is the drying of lactating cows and the least prioritized are equipment and floor criteria. Keywords: dairy cows, GDFP, GMiP
Keyword: dairy cows, GDFP, GMiP, 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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