Judul: Local Concentrate Substitution with Pro-Ma-Based Concentrate at Kuansing Farm Riau
Abstrak: Penelitian ini bertujuan untuk mengevaluasi kualitas nutrisi Pro-Ma dan kemampuan substitusi konsentrat Pro-Ma terhadap konsentrat lokal. Penelitian ini menggunakan 12 sapi Brahman Cross berumur dua sampai tiga tahun (252-473) kg. Rancangan menggunakan rancangan acak kelompok (RAK) split plot in time dengan tiga perlakuan ransum (T0, T1, dan T2) sebagai petak utama (faktor A) dan dua periode (P1 dan P2) sebagai anak petak (faktor B) dan empat kelompok sebagai ulangan. T0 = konsentrat lokal, T1 = 50% T0 + 50% T2, T2 = konsentrat ditambah Pro-Ma. Perbandingan hijauan dan konsentrat adalah 30: 70% bahan kering. Peubah yang diukur adalah pertambahan bobot badan harian (PBBH), laju pertumbahan, dan income over feed cost (IOFC). Data dianalisis menggunakan ANOVA dan dilanjutkan dengan uji Tukey. Hasil penelitian menunjukkan T2 berpengaruh nyata lebih tinggi (P<0,05) terhadap PBBH dan tidak berpengaruh nyata terhadap laju pertumbuhan (P>0,05), nilai IOFC terbaik adalah T2. Konsentrat ditambah Pro-Ma meningkatkan PBBH dan IOFC dan mampu menggantikan konsentrat lokal serta meningkatkan kualitas gizi dan nilai ekonomis yang juga disebabkan tingginya penggunaan tepung ikan, This study aimsed to evaluate the nutritional quality of Pro-Ma and the ability to substitute concentrates Pro-Ma to local concentrates. This study used 12 Brahman cross cattle aged two to three years (252 - 473) kg. The experimental design used was a split plot in time randomized block design (RBD) with three treatment diets (T0, T1, and T2) as the main plot (factor A) and two periods (P1 and P2) as subplots (factor B) and four groups as replicates. T0 = local concentrate, T1 = 50% T0 + 50% T2, T2 = Pro-Ma based concentrate. The ratio of forage and concentrate was 30: 70% of dry matter basis. Data used daily body weight gain (DBWG), growth rate, and income over feed cost (IOFC). Analyzed data with ANOVA and post test with Tukey test. The results show that T2 significant effect (P<0.05) on daily body weight gain and not significant effect on growth rate (P>0.05), the best IOFC was T2. Pro-Ma based concentrate increases DBWG and IOFC and concentrates are able to replace local concentrates and can improve nutritional quality and economic value
Keyword: Brahman cross cattles, sapi Brahman cros, Pro-Ma, daily body weight gain (DBWG), slow release amonia, income over feed cost (IOFC)

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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