Judul: The production of “kereman” cattle in tlogohendro village, pekalongan, central java
Abstrak: Sapi potong menjadi salah satu komoditi utama petani di Tlogohendro, Kabupaten Pekalongan. Penelitian ini bertujuan untuk mengevaluasi produksi sapi potong di Pekalongan, Jawa Tengah. Metode yang digunakan dalam penelitian ini adalah survei ke lokasi yang telah ditentukan secara sengaja (purposive) yakni dusun yang memiliki sapi dengan jumlah rata-rata kepemilikan 2-4 ekor yang menerapkan pola kereman. Hasil penelitian menunjukkan jenis dan karakteristik dari dataran tinggi dan rendah secara signifikan mempengaruhi peternakan sapi potong yang mengakibatkan produksi sapi berbeda. Pemeliharaan dengan sistem kereman di Dusun Tlogo memiliki produktivitas yang lebih tinggi sehingga menghasilkan keuntungan yang lebih tinggi., Beef cattle become one of the main comodities of farmers in Tlogohendro of Pekalongan Regency as a source of family income and asset. This study was aimed to evaluate the production system and productivity of beef cattle in Pekalongan Central Java. The method used in this study was by conducting survey to some purposively determined locations which have at about 2-4 beef cattles and apply the “Kereman” system. The result showed that the types and characterictics of high and low land significantly influenced the beef cattle farming which resulted in different cattle production system and productivity. The beef cattle farming by using ‘kereman’ system, had higher productivity and also resulted in the higher benefit.
Keyword: sapi potong, pengembangan ternak, kereman

Judul: Evaluasi Penerapan Good Farming Practice pada Peternakan  Rakyat Sapi Potong di Situ Bolang Indramayu
Abstrak: Produktivitas ternak sapi potong domestik belum cukup untuk memenuhi kebutuhan dalam negeri. Sebanyak 90% peternakan sapi di Indonesia dikelola secara tradisional. Penelitian bertujuan mengevaluasi pengelolaan peternakan sapi potong di Peternakan Situ Bolang sesuai Peraturan Menteri Pertanian Republik Indonesia Nomor 46/Permentan/PK.210/8/2015 tentang Good Farming Practice untuk Sapi Potong. Penelitian menggunakan analisis deskriptif kualitatif wawancara kepada 33 responden menggunakan kuesioner dan pengamatan secara langsung. Hasil penelitian dapat dilihat dari nilai aspek Good Farming Practice yaitu pembibitan dan reproduksi, manajemen pakan, tata laksana pemeliharaan, perkandangan, dan kesejahteraan ternak. Penerapan GFP oleh peternak rakyat di Situbolang Indramayu mendapatkan nilai 2,05 tergolong dalam kategori sangat kurang., Domestic beef cattle productivity is not sufficient to meet domestic demand. As many as 90% of cattle farms in Indonesia are managed traditionally. The study aimed to evaluate the management of beef cattle farming in Situ Bolang Farm according to the Regulation of the Minister of Agriculture of the Republic of Indonesia Number 46/Permentan/PK.210/8/2015 about Good Farming Practice for Beef Cattle. The study used descriptive qualitative analysis of interviews with 33 respondents using questionnaires and direct observation. The results of the study can be seen from the value of aspects of breeding and reproduction, feed management, rearing procedures, cowshed, and animal welfare. Implementation of GFP by smallholder farmers in Situbolang Indramayu received a score of 2.05, which is classified as very lacking.
Keyword: beef catle, community farm, good farming practice

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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