Judul: Fermented Feed Containing Sorgum and Indigofera on Male Sheep Performance
Abstrak: Pengaruh pemberian silase sorgum dan indigofera bernama Sorinfer dalam kadar yang berbeda terhadap performa domba lokal jantan. Penelitian dilakukan selama 7 minggu di kandang individu. Penelitian ini menggunakan 20 ekor domba jantan dewasa dengan bobot badan 20,90±3,72 kg. Domba dibagi menjadi 5 perlakuan dengan 4 ulangan terdiri dari P0 = 100% rumput lapangan (RL), P1 = 75% RL + 25% Sorinfer(S), P2 = 50% RL + 50% S, P3 = 25% RL + 75% S, P4 = 100% S. Uji Duncan digunakan jika ada perbedaan data menggunakan analisis varians ANOVA (Analyses of Variance) menggunakan software SPSS. Parameter yang diukur dalam penelitian ini adalah konsumsi nutrien pada pakan, pertambahan bobot badan harian, dan Income Over Feed Cost. Hasil penelitian menunjukkan bahwa perlakuan berpengaruh nyata (P<0,05) terhadap konsumsi bahan kering, pertambahan bobot badan harian, dan pendapatan terhadap biaya pakan. Kesimpulannya Sorinfer sampai dengan tingkat rasio 75% dapat meningkatkan asupan bahan kering, protein kasar, lemak kasar, serat kasar, pertambahan berat badan harian, dan Income Over Feed Cost., The effect of giving sorgum and indigofera silage named Sorinfer in different levels on the performance of males local sheeps. Research conducted over 7 weeks in their own cage. This research used 20 adult male sheeps, with body weight of 20.90±3.72 kg. The sheeps were divided into 5 treatments with 4 replicates consisted of P0 = 100% field grass (RL), P1 = 75% RL + 25% sorinfer (S), P2 = 50% RL + 50% S, P3 = 25% RL + 75% S, P4 = 100% S. Duncan test was used if there was a difference in the data using analysis of variance ANOVA (Analyses of Variance) using SPSS software. The parameters measured in this study were feed intake nutrient, daily weight gain, and income over feed cost. The treatment had a significant effect (P<0.05) of dry matter intake, daily weight gain, and income over feed cost. The conclusion is the sorinfer up to 75% level of ratio can increase intake of dry matter, crude protein, crude fat, crude fiber, daily weight gain, and income over feed cost.
Keyword: Domba, Performa, Sorinfer

Judul: Performa Domba Lokal dengan Pemberian Pakan Konsentrat Komersial dan Sorinfer pada Taraf yang Berbeda
Abstrak: Performa domba dipengaruhi oleh beberapa aspek seperti manajemen pakan. Penelitian bertujuan mengkaji performa domba lokal dengan pemberian pakan kombinasi sorinfer terhadap performa produksi domba lokal. Domba yang digunakan adalah domba betina lokal betina yang berumur 1-2 tahun (I0- I1) sebanyak 15 ekor dengan rataan bobot awal 19,38±3,11 kg. Penelitian menggunakan 3 perlakuan ransum yaitu konsentrat yang dikombinasikan dengan silase sorinfer dengan rasio P1 75:25, P2 50:50, P3 25:75. Peubah yang diamati adalah konsumsi ransum as feed, bahan kering (BK), protein kasar (PK), energi (TDN), konversi ransum as feed, BK, pertambahan bobot badan (PBB), bobot akhir, serta feed cost per gain (FCG). Data dianalisis kovarian (ANCOVA) menggunakan Statistical Product and Service Solution (SPSS) yang diuji lanjut dengan metode Duncan. Hasil penelitian menunjukkan konsumsi ransum as feed, BK, PK pada perlakuan P1 nyata lebih tinggi (P<0,05) dibandingkan dengan perlakuan lainnya. Nilai TDN, konversi as feed, konversi BK, PBB, dan FCG ketiga perlakuan tidak berbeda nyata (P>0,05). Perlakuan P1 menghasilkan performa domba terbaik berdasarkan konsumsi as feed, konsumsi BK, dan konsumsi PK.
Keyword: Domba Lokal, Konsentrat, Performa, Sorinfer

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: