Judul: Pengaruh Tepung Garut, Ubi Jalar, dan Onggok Sebagai Bahan Perekat Alami Pelet Terhadap Kualitas Fisik Pakan dan Performa Ayam Broiler
Abstrak: Binder is a substance that has the function to bind the feed component in the form of pellets so that its structure remains compact. The purpose of this research was to know the effect of addition of garut flour, sweet potato flour, and onggok as natural binder for pellet on physical quality of feed and performace of broiler chickens. Completely Randomized Design was used in this experiment, using 4 treatments and 3 replications on physical quality feed, and 4 treatments and 4 replications on performance of broiler. The treatments were R1 = control without binder, R2 = addition of onggok 2%, R3 = addition of sweet potato flour 2%, R4 = addition of garut flour 2%. The data were analyzed using Analysis of Varience (ANOVA) and significant results were further tested using Duncan’s Multiple Range Test. The results showed that addition of onggok 2% in feed influenced (P<0.05) angle of repose (26.30°) and pellet durability index (98.35%), but the treatments in terms did not influence the performance of broiler chickens. The conclusion of this experiment was that onggok 2% as binder yielded the best pellet quality of broiler chickens. The treatments did not influence the performance of broiler chickens. Addition onggok 2% as binder yielded the highest value of IOFCC (Rp. 2337.82/bird)
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Judul: Evaluasi Penggunaan Tepung Garut, Tepung Ubi Jalar dan Onggok sebagai Perekat Pellet Terhadap Persentase Bobot Karkas, Lemak Abdomen dan Organ Dalam Ayam Broiler
Abstrak: Penelitian dilakukan untuk mengevaluasi penggunaan tepung garut, ubi jalar dan onggok sebagai perekat pellet terhadap persentase bobot karkas, lemak abdomen dan organ dalam ayam broiler. Penelitian ini menggunakan 32 ekor ayam broiler dari 240 ekor Day Old Chick yang dipelihara dalam kandang litter selama lima minggu. Analisis data menggunakan Rancangan Acak Lengkap dengan 4 perlakuan dan 4 ulangan. Perlakuan yang diberikan yaitu: A1 = pakan basal, A2 : A1 + 2% tepung garut, A3 : A1 + 2% tepung ubi jalar dan A4 : A1 + 2% onggok. Hasil penelitian menunjukkan bahwa penggunaan tepung garut, tepung ubi jalar dan onggok tidak mempengaruhi berat karkas, organ dalam dan lemak abdomen ayam broiler. Rata-rata persentase berat karkas, lemak abdomen, jantung, hati dan rempela pada penelitian ini adalah 64.03%-64.41%, 0.87%-1.14%. 0.58%-0.61%, 2.52%-2.79%, 2.09%-2.20%. Berdasarkan hasil penelitian dapat disimpulkan bahwa perlakuan tidak memberikan pengaruh pada persentase berat karkas, lemak abdomen dan organ dalam ayam broiler.
Keyword: viscera, abdominal fat, carcass, binder, broiler

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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