Judul: Keragaan Galur-galur Harapan Sorgum (Sorghum bicolor (L.) Moench) di Tanah Masam, Jasinga
Abstrak: This research was aimed to obtain information on performance of sorghum IPB breeding lines under acid soil conditions. The research was conducted at Cikopomayak, Jasinga, Bogor from March to August 2013. The experimental design used was Randomized Complete Block Design with genotype as the treatment. The plant materials used were 17 strain of sorghum IPB breeding lines, Numbu and UPCA S1 as check varieties. The results showed that there were significantly different among genotypes evaluated for leaf number, flowering time, panicle length and thousand of grain weight. Leaf number, plant height, diameter of stem positively correlated with biomass weight. Plant height, diameter of stem, biomass weight and thousand of grain weight positively correlated with grain weight panicle-1. The IPB breeding lines showed comparable grain weight panicle-1 to the check varieties. Yield potential of N/UP-4-3, N/UP-82-3, N/UP-118-7, N/UP-124-7, N/UP-139-1 dan N/UP-139-5 strain were better than UPCA S1 in range 3–4 ton ha-1.
Keyword: sorghum, performance, genotipe, acid soil

Judul: Keragaan Galur Sorgum (Sorghum bicolor (L.) Moench) di Tanah Masam Lampung Selatan
Abstrak: This study aims to obtain information on the performance of agronomic characters and yield components of sorghum F8 lines, to conduct yield trials of 17 F8 lines derived from a cross between Numbu x UPCA S1 in acid soils and to identify lines that have better yield than the parental lines. This study was conducted from March to August 2013 at the Experimental Field of BPTP Lampung, District Natar, South Lampung. The plant material used is 17 strain of sorghum varieties from crosses F8 Numbu as female parents and UPCA S1 as the male parent. The results of analysis of variance showed that the strain are not significantly different in harvesting time and weight of panicles but were significantly different to the character of stem diameter, number of leaves, flowering, seed / panicle weight and weight of 1000 seeds, as well as highly significant and a positive for plant height and panicle length. Positive correlation and highly significant was shown by panicle length with seed / panicle weight and weight of 1000 seeds. The N/UP-4-8, N/UP-48-2, N/UP-118-7, N/UP139-1, N/UP-139-5, N/UP-159-9 dan N/UP-166-6 strain are strain that have seedpanicle-1 weight larger than average strain evaluation
Keyword: yield components, sorghum, agronomic characters, acid soil stress conditions

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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