Judul: Evaluasi Kandungan Nutrien Daun Torbangun (Coleus amboinicus Lour.) Secara in Vitro Terhadap Pengaruh Interval Defoliasi dan Pupuk
Abstrak: Penelitian ini bertujuan untuk mengevaluasi kandungan nutrien daun torbangun secara in vitro terhadap pengaruh interval defoliasi dan penambahan pupuk ayam broiler yang berbeda level. Rancangan percobaan yang digunakan adalah rancangan acak kelompok pola faktorial 3x3 dengan 3 ulangan. Faktor perlakuan meliputi interval defoliasi (6 minggu, 9 minggu dan 12 minggu) dan penambahan level pupuk kandang ayam broiler 100%, 75% dengan FMA+MPF, 50% dengan FMA&MPF. Data dianalisis dengan analisis sidik ragam, perbedaan yang signifikan diuji menggunakan uji lanjut Duncan dengan SPSS. Parameter yang diamati kandungan mineral (P, Fe dan Ca), konsentrasi N-Protein, kecernaan bahan kering dan organik, konsentrasi amonia serta VFA total. Perlakuan interval defoliasi dan pemupukan berpengaruh nyata (P<0.05) terhadap nilai mineral (Fe, Ca dan P) serta kecernaan bahan kering. Perlakuan umur panen 12 minggu berpengaruh nyata (P<0.05) terhadap N-Protein, kecernaan bahan organik dan konsentrasi amonia. Interaksi antar perlakuan berpengaruh terhadap nilai mineral besi, kalsium dan kecernaan bahan kering.
Keyword: Coleus amboinicus L., kecernaan, mineral, pupuk, interval defoliasi

Judul: Evaluasi Kandungan Nutrisi Daun Torbangun (Coleus amboinicus Lour) terhadap Daya Hidup Mikroba Rumen dan Kecernaan In vitro
Abstrak: This research was conducted to examine the effect of torbangun (Coleus amboinicus Lour) in the diet on the viability of rumen microbes (bacteria and protozoa populations) and in vitro digestibility, using randomized block design with rumen liquid collecting time as a group with 5 treatments and 3 replicates. The treatments were: R0 (kontrol): 60% H + 40% K, R1: RO + 2.5% T, R2: RO + 5% T, R3: RO + 7.5% T, R4: RO + 10% T. Data were analyzed by Analysis of Variance. Further tested Contrast Ortogonal and Polynomial, if there was significant differences. Parameters that measured include: viability rumen of microorganisms (bacteria and protozoa populations), fermentability (the concentration of TVFA and N-NH3), and digestibility (dry and organic matter) in the rumen. The experiment showed that treatments significantly (P<0.05) affected dry matter digestibility and VFA concentration on additional treatment torbangun leaves as much as 2.5% in the ration (R1).
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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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