Judul: Uji daya hasil sembilan galur harapan kedelai hasil persilangan kultivar slamet dengan nokhonsawon di lahan asam
Abstrak: The objective of this experiment was to test the productivity of nine lines of soybean on the acid land. This experiment was carried out by using split plot design, with three replications. The main plot was liming treatment and the sub plot was lines/cultivars of soybean. Nine soybean lines tested in this experiment are KH 9,KH 10, KH 11, KH 28, KH 35, KH 38,KH 40, KH 42,KH 44, and four cultivars i.e. Slamet, Panderman, Willis, and Tanggamus were used as standard. The seeds were planted in the distance of 40 cm x 20 cm, and each plot was 2.5 m x 3 m.
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Judul: Uji daya hasil 8 galur harapan kedelai hasil persilangan  kultivar Slamet dan Nokonsawon
Abstrak: This research had an objective to test eight hybrid soybean li nes from crossing between Slamet and Nokonsawon cultivar and the effect of Bio P 2000 Z fertilizer to the productivity of these lines. The experiment was done by randomize block design consisting of two blocks and two factors of treatment i.e. lines/cultivars and fertilizing level by Bio P 2000 Z. The lines/cultivar tested were eight lines (KH 3, KH 4, KH 6, KH 8, KH 9, KH 10, KH 11, and KH 28), and three cultivars (Slamet, Panderman and Tanggamus) as a standard. Two levels of fertilization were applied i.e. with and without Bio P 2000 Z fertilizer. The size of each experiment plot is 5m x 3m. The result of experiment showed that in general, all eight lines had higher productivity than Slamet. The productivity of KH 11, KH 10 and KH 9 was consistently higher than Slamet, Panderman, and Tanggamus. Bio P 2000Z fertilizer only had an effect to the seed productivity in the fertile soil i.e. block 2. All lines had big seed and their seeds bigger than that of Slamet and Tanggamus. Comparing with Panderman, KH 10 had bigger seeds meanwhile KH 6 was relatively smaller. Other lines had a same size of seeds with Panderman.
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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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