Judul: Evaluasi Karakter Agronomi Galur-galur Generasi Awal Sorgum (Sorghum bicolor (L.) Moench) Hasil Persilangan B-69 x Numbu
Abstrak: The objectives of this experiment were to evaluate performance and variability of agronomic characters of 62 F3, 31 BC1P1F2 and 31 BC1P2F2 of early generation lines of sorghum. This research was carried at Leuwikopo Experimental Farm, Bogor Agricultural University, Dramaga, Bogor from February to June 2013. The experiment was arranged in a randomized complete block design augmented with one factor genotype and 12 replications. The agronomic data was analyzed by comparing means of each line to the parental lines B-69 and Numbu. The results showed that the early generation lines showed significant difference with the parental lines, B-69 and Numbu for agronomic characters and yield components. The early generation lines from BC1P2F2 have higher mean value for stem diameter, crop height and biomass weight, compared to B-69 and Numbu, while the BC1P1F2 lines have lower crop height compared to B-69 and Numbu. The panicle weight and seed weight per plant have high heritability value, which allow for further selection.
Keyword: sorghum, early generation, heritability

Judul: Keragaan Karakter Agronomi dan Keberhasilan Persilangan Galur-galur Sorgum (Sorghum bicolor (L.) Moench)
Abstrak: The objectives of this experiment were to determine the performance character of the parental lines and crossing ability of sorghum (Sorghum bicolor (L.) Moench) lines. This research was carried out in the Leuwikopo Experimental Farm, Bogor Agricultural University, Dramaga, Bogor and started from February 2013 to July 2013. This experiment was arranged by two sebdivission. The first experiment was arranged in a randomized complete block design with one factor and three replications, and the second was arranged in line x tester crossing methode. Performance of agronomic traits of the parental lines showed significant differences with Numbu and Kawali varieties in all variables, except the germination variable. Performance of yield comoponent in sorghum lines showed significant differences with Numbu and Kawali varieties, especially on the character length of panicle and thousand grain weight. The results showed a positive correlation between agronomic characters and yield component. The results showed that the cross compatibility introduced lines was higher than IPB breeding lines and mutant lines of sorghum. The successful at the each lines did not indicate correlation of the climate components
Keyword: yield component, hybridization, agronomy character

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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