Judul: Local Feed Stuff Based Concentrate Test with ProMa Addition to Cattle at Kuansing Farm
Abstrak: Penelitian ini bertujuan untuk menguji kualitas nutrisi ProMa (suplemen dengan teknologi slow release amonia) dan mengevaluasi substitusi konsentrat berbahan baku ProMa terhadap konsentrat lokal pada produktivitas ternak. Penelitian menggunakan sapi Brahman Cross bobot 338 ± 63 kg. Rancangan penelitian menggunakan rancangan acak kelompok (RAK) split plot (In Time) 3 x 2 dengan 4 ulangan. Petak utama terdiri dari T0 = rumput lapang + konsentrat lokal, T1 = rumput lapang + konsentrat campuran (T1+T2), dan T2 = rumput lapang + konsentrat disuplementasi ProMa dan anak petak terdiri dari 10 hari pertama (P1) dan 10 hari kedua (P2). Data dianalisis dengan ANOVA dan uji lanjut menggunakan uji lanjut Tukey. Peubah yang diukur adalah konsumsi bahan kering, pertambahan bobot badan harian, dan efisiensi penggunaan pakan. Hasil penelitian menunjukkan bahwa penambahan ProMa dalam konsentrat dapat meningkatkan penggunaan ubi kayu (51,5%) dan tepung ikan (10%) tanpa menurunkan produktivitas ternak. Konsentrat disuplementasi ProMa dapat mensubstitusi konsentrat lokal dengan hasil lebih baik dengan meningkatnya konsumsi bahan kering dan pertumbuhan bobot badan ternak yang juga disebabkan tingginya penggunaan tepung ikan., This study was aimed to test the nutritional quality of ProMa (feed supplement with slow release amonia technology) and evaluated substitution of ProMa based concentrate against local concentrate on productivity. This study used Brahman Cross cattle weighing 338 ± 63 kg. Research design used randomized block design (RBD) split plot (In Time) 3 x 2 with 4 replicates. Main plot were T0 = airy grass + local concentrate, T1 = airy grass + mixed concentrate (T1+T2), and T2 = airy grass + ProMa based concentrate and sub plot were first 10 days (P1) and second 10 days (P2). Data were analyzed using ANOVA and post test used Tukey test. Observed variable were dry materials consumption, daily weight gain, and feed utilization efficiency. The results showed that addition of ProMa in concentrate could increase the use of cassava (51.5%) and fish meal (10%) without lowering productivity. ProMa based concentrate could substitute local concentrate with better results from increased consumption of dry materials and growth of cattle body weight which also due to the high use of fish meal.
Keyword: Brahman Cross cattles, feed consumption, ProMa, slow release amonia

Judul: Penampilan bobot badan, pertambahan bobot badan dan karkas sapi brahman cross heifer dengan pemberian konsentrat yang berbeda
Abstrak: Beef cattle production in Indonesia can not meet the huge demand for beef. Increased consumption of beef in Indonesia must be balanced with the addition of an adequate production is by way of an increase in beef cattle population. Calves that are kept by the fattening of beef cattle industry in Indonesia generally come from Australia, for example, Brahman Cross cattle (BX). Given the stock price and the lack of beef steer at the time, then to overcome them been procured Heifer cows that have a fairly good quality with a cheaper price than the price of steer beef. This study aimed to study the appearance of body weight, body weight gain and carcass Heifer Brahman Cross cattle by administering different concentrtioans, the number of samples used as much as nine calves. Data obtained in this study treated descriptively. The mean, standard deviation and coefficient of variation was calculated using the formula Walpole (1992). With the treatment of three different types of concentrates. Variables observed in this study is the final weight, body weight gain, carcass weight, carcass percentage, meat percentage of carcass weight and carcass percentage of final weight. The results obtained in this study is the final weight of P1 (325.30±10.90) is relatively lower than P2 and P3 respectively (380.30±16,20; 365,66±7.47), of accretion P3 body weight (0.18±0.11) is relatively lower than P1 and P2 respectively (0.43±0,04; 0,79±0.11), carcass weight P1 (153.97±5.05) was relatively lower than P2 and P3 is (168.30±9.96; 173.30±1.91), percentage of carcass P2(43.70±1.18) was relatively lower than P1 andP3 is (47.33±0.51; 47.40±0.45), meat percentage of carcass weight P2 (62.90±1.82) is relatively lower than the P3 P1dan (63.50±1.30; 63.40±1.39), percentage of meat to cutting the weight of P2 (27.48±0.30) was relatively lower than P1 and P3 is (30.06±0.96; 30.42±0.40) , feed intake assessment conducted by a descriptive test with the amountof each P1, P2 and P2 is (7.42; 7.99; 7.38). Overall response Cross Heifer Brahman cattle on feed P2 feed tend to be better than the P1 and P3.
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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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