Judul: Impact of Breeder Groups Membership on Beef Cattle Fattening Livestock Business Income in East Java Province
Abstrak: Sebanyak 90% produksi daging sapi nasional berasal dari peternakan rakyat. Pendapatan dari usaha peternakan penggemukan sapi potong menjadi salah satu sumber pendapatan bagi peternak terutama yang masih berskala kecil dan memiliki luas lahan pertanian yang sempit. Kelompok peternak menjadi salah satu upaya untuk meningkatkan kompetensi peternak yang dapat berdampak pada peningkatan pendapatan yang diperoleh. Penelitian ini bertujuan untuk menganalisis dampak keanggotaan kelompok peternak terhadap pendapatan peternak penggemukan sapi potong. Data yang digunakan merupakan data sekunder Survei Rumah Tangga Usaha Peternakan Tahun 2014 yang bersumber dari Badan Pusat Statistik di Provinsi Jawa Timur. Pengolahan data dilakukan secara kuantitatif dengan analisis pendapatan dan propensity score matching (PSM). Hasil penelitian menunjukkan bahwa kelompok peternak tidak berpengaruh secara signifikan terhadap pendapatan usaha peternakan penggemukan sapi potong di Jawa Timur., As much as 90% of national beef production comes from smallholder farms. Income from fattening beef cattle is a source of income for breeders, especially those that are still on a small scale and have a narrow agricultural land area. Breeder groups are one of the attempts to increase the competence of breeders so that it can have an impact on increasing the income earned. This study aims to analyze the effect of breeder groups membership on the income of beef cattle fattening farmers. The data used is secondary data from the “Survei Rumah Tangga Usaha Peternakan Tahun 2014” sourced from the Badan Pusat Statistik of East Java Province. Data processing was carried out quantitatively with income analysis and Propensity Score Matching (PSM). The results showed that farmer groups had no significant effect on beef cattle fattening income in East Java.
Keyword: beef cattle, income, livestock group, propensity score matching

Judul: Analysis of Beef Cattle Farming Business for Members and Non-Members of Sentra Peternakan Rakyat in Bojonegoro District
Abstrak: Populasi sapi potong di Indonesia terus meningkat setiap tahunnya, hal tersebut menjadikan usahaternak sapi potong berpeluang besar untuk dikembangkan terutama pada peternakan rakyat yang saat ini masih didominasi oleh usahaternak berskala kecil. Salah satu program yang dicanangkan pemerintah untuk pemberdayaan peternak yaitu Sentra Peternakan Rakyat (SPR). SPR Mega Jaya merupakan SPR percontohan dan terbaik di Indonesia tahun 2017. Namun tidak semua peternak tergabung dalam SPR, sehingga penelitian ini bertujuan untuk menganalisis struktur biaya, penerimaan, serta pendapatan peternak anggota dan non anggota SPR Mega Jaya. Metode analisis yang digunakan adalah analisis pendapatan usahaternak sapi potong, R/C ratio, dan uji beda. Hasil penelitian menunjukkan pendapatan atas biaya total usahaternak anggota SPR dan non anggota berturut-turut sebesar Rp8.561.126,06 dan -Rp3.928.392,91. Nilai R/C rasio total sebesar 1,37 persen dan 0,76 persen, hal ini menunjukkan bahwa usahaternak anggota layak dijalankan sedangkan non anggota tidak layak untuk dijalankan., The beef cattle population in Indonesia continues to increase every year, making beef cattle farming a great opportunity to be developed, especially on smallholder farms which are currently still dominated by small-scale farming. One of the programs launched by the government to empower farmers is the People's Livestock Center (SPR). SPR Mega Jaya is a pilot SPR and the best in Indonesia in 2017. However, not all farmers are members of SPR, so this study aims to analyze the cost structure, revenue, and income of farmer members and non-members of SPR Mega Jaya. The analytical methods used were beef cattle farming income analysis, R/C ratio, and difference test. The results showed that the income over the total cost of farming of SPR members and non-members amounted to Rp8.561.126,06 and -Rp3.928.392,91, respectively. The total R/C ratio value is 1,37 percent and 0,76 percent, this indicates that the livestock business of members is feasible to run while non-members are not feasible to run.
Keyword: pendapatan, R/C ratio, sapi potong, Sentra Peternakan Rakyat, Uji beda

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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