Judul: Keragaan galur harapan padi sawah tipe baru di Sukabumi dalam rangka uji multi lokasi
Abstrak: Agronomy and Horticultural Departement, Bogor Agricultural University, has been researched for several rice promising lines to release high yielding variety. This experiment is a part of multilocation yield trial. The experiment was conducted at Sukabumi Regency, West Java on January until May 2010. The research was arranged by Randomized Compately Block Design with 3 replications. The result showed that the highest yield (7,7 t/ ha) obtained from IPB102-F-92-1-1 whereas the lowest yield obtained from IPB102-F-91-2-1 (5,2 t/ha). The productivity of IPB102-F-92-1-1 is only significantly higher than Ciherang and IR64. The other productivity were as same as Ciherang and IR64. The performances of IPB97-F-13-1-1, IPB97-F-15-1-1, IPB97-F-20-2-1, IPB97- F-31-1-1, IPB102-F-92-1-1, and IPB107-F-16-5-1 are representing new plant ideotype.
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Judul: Keragaan galur harapan padi tipe baru (PTB) IPB di Bogor dan Kulon Progo dalam rangka uji multilokasi
Abstrak: The objective of the experiment were to test yield potential and identify rice promising lines as part of multilocation yield trial. The experiment was conducted at two locations namely Bogor Regency, West Java and Kulon Progo Regency, D. I. Yogyakarta from January until May 2010. The experimental was arranged by Randomized Compately Block Design with three replications. The experimental consists of eight rice promising lines and two control varieties. The result of the analyses indicated that lines IPB97-F-13-1-1, IPB97-F-15-1-1, IPB97-F-20-2-1, IPB97-F-31-1-1, IPB97-F-44-2-1, IPB102-F-90-1-1, and IPB102-F-92-1-1 have yield were higher than Ciherang (6.764 ton/ha) and IR64 (6.972 ton/ha). Each lines having yield 8.228 ton/ha, 9.309 ton/ha, 8.692 ton/ha, 8.183 ton/ha, 8.222 ton/ha, 7.204 ton/ha, and 8.029 ton/ha recpectively. In addition, the location effected on the appreance of rice promising lines. There were interaction of genetic and environment on plant height, total number of tillers, panicle length, 1 000 grain weight and yield.
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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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