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: 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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