Judul: Evaluasi Daya Hasil Jagung Manis (Zea mays L. var. saccarata)
Abstrak: Research has been done is the yield evaluation of hybrid sweet corn (Zea mays L. var. saccharata) with the aim of testing the results of seven sweet corn. Hybrids in order to support the needs of hybrid corn seed. The research began in Cibeurem, Darmaga, Bogor in October 2011 to January 2012. Genotypes used were: 3 x 4B, 6 x 8, 6 x 4A, 6 x 3, 3 x 8, 3 x 4A, and 6 x 4B and four commercial varieties were Mutiara, Sweet Boy, Super Sweet Corn, and Talenta. The hypothesis of this research is the evaluation of sweet corn hybrids can be superior or equal to the commercial varieties that can be continued into the new varieties. Experimental design used was Randomized Complete Block Design with three replications. Data were analyzed using the F test and if significantly different be followed by Dunnet (α = 5%). The result of this research showed that skin cobs weight, skin cobs weight/plot, productivity, and harvest index from 6 x 3, 6 x 4A and 6 x 4B hybrids were not significantly different with the best commercial variety, Talenta. Hybrid of 3 x 4A, 3 x 4B, and 3 x 8 have skin cobs weight and harvest index which not significantly different with the best commercial variety, Talenta. Total soluble solids(°brix) of seven hybrid was not significantly with the best commercial variety, Talenta.
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Judul: Daya Hasil dan Kualitas Jagung Manis (Zea mays var. saccharata Sturt.) Genotipe SD-3 dengan Empat Varietas Pembanding di Kabupaten Bogor
Abstrak: This research was a trial step in order to study the potential of SD-3 sweet corn genotype to be developed into high-yielding variety which is able to compete with commercial varieties. The experiment used Randomized Complete Block Design, single factor, with five treatments and four replications. The treatment consisted of one sweet corn genotype (SD-3) and four comparison varieties (Super Sweet, Bonanza, Sweet Boy, and Sugar 75). This experiment was aimed to evaluate the appearance, yield and quality of SD-3 genotype with four comparison varieties in Bogor by observing agronomic character in the field, vegetative and generative growth, production potential as well as quantity and quality of crop. Data was analyzed with ANOVA (F-test) then continued with Dunnet test (α = 5 %) and Pearson correlation coefficient. The results of research showed that there was a significant different in several quantitative variables of sweet corn. Genotype treatment did not significantly affect on the productivity. Based on comparative advantage, SD-3 genotype is better than all comparison varieties
Keyword: sweet corn, evaluation, character, advantage, Bogor Agricultural University (IPB)

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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