Judul: Daya hasil dan kualitas jagung manis genotipe sd3 dengan empat varietas Pembanding di Kabupaten Bandung
Abstrak: The productivity of sweet corn is low caused by not using superior seed. The hybrid sweet corn seed price is expensive. The cheap of non-hybrid sweet corn seed is not available in the market. SD3 (open-pollinated variety) assembled to share a cheaper seed for farmers. The objective of this research was to evaluate yield, quality and performance of sweet corn genotype SD3 compared to four varieties (Super Sweet, Bonanza, Sweet Boy, and SG 75). The experiment was conducted from 30 June to 1 Oktober 2012 using a Randomized Complete Block Design with one factor and four replications at Banjaran, Cimaung sub district, Bandung regency. Based on research result, genotype SD3 is higher than Super Sweet (open-pollinated variety) for kernel row number and total soluble solid level. Meanwhile, when compared to Bonanza and Sweet Boy (hybrid variety), genotype SD3 can not compete. Bonanza is higher than SD3 for ear diameter, ear weight with cornhusk, ear weight without cornhusk and productivity. Sweet Boy is higher than SD3 for ear length and ear diameter. Genotype SD3 is the same as SG 75 (hybrid variety) in all variables except for vegetative variable, those are plant height and main ear height.
Keyword: yield, quality, SD3, sweet corn

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: 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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