Judul: Productivity test of soybean lines in Majalengka at two planting seasons
Abstrak: Soybean (Glycine max L. Merr) is a very important crop in Indonesia. The development of new elite varieties is one approach to increase the national production of soybean. We have developed several potential lines of soybean to be realeased as a new variety. The productivity of these lines has to be tested in several locations. Therefore the objective of this research is to study the productivity of fourteen soybean lines resulted from the cross between Slamet and Nokonsawon varieties and four national varieties as standard in Majalengka in two seasons. The research was designed as Randomized Block, with three block replications in two planting seasons. The result showed that based on the seed production per plant, at the two seasons, all the lines tested had higher productivity than that of Anjasmoro variety which is the elite varieties recognized as the highest productivity. All lines have bigger seed size than that of four standard varieties. Soybean lines KH 40, KH 42, KH 44, KH 58 were the potential lines to be released as new varieties with high productivity and big seed size. More over KH 42 line adapt very well in two planting seasons.
Keyword: 

Judul: Uji Daya Hasil Beberapa Galur Kedelai (Glycine max L. Merr) di Mataram Pada Dua Musim Tanam
Abstrak: Soybean with high yield, large seed size and short maturity are become consumer’s preference recently. Indonesia import two tons of soybean grain each year. The development of new varieties is one of the approach to increase the national production of soybean. We have developed several potential lines of soybean to be released as a new variety. The productivity of these lines has to be tested in several locations. The objective of this research was to study the productivity of six soybean lines and four national varieties as standard in Mataram in two seasons. The research was carried on by Randomized Block, with three block replications. The result showed that based on the seed production per plant, during two seasons all the lines tested had higher productivity than Anjasmoro variety. KH 55 and KH 71 were the potential lines to be released as new varieties with high productivity and bigger seed size.
Keyword: 

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.
Keyword: