Judul: Evaluasi Karakter dan Daya Hasil Beberapa Genotipe Tomat (Lycopersicon esculentum Mill.) di Kebun Percobaan IPB Tajur, Bogor
Abstrak: Tomato (Lycopersicon esculentum Mill.) is one of the important vegetable in Indonesia. This research was conducted to study the performance of yield and to get information about horticultural characteristic of some tomato genotypes in Bogor Agricultural University Experimental Field Tajur, Bogor. The experiment was arranged using Randomized Complete Block Design (RCBD) with genotypes as a single factor. Plant materials were 15 genotypes of tomato and one comercial hybrid (Permata) as a control variety. The result showed there were phenotypic variability among genotypes were evaluated in both quantitative and qualitative characters. Plant height range from 55.01-106.48 cm, days to flowering from 20-31 days, days of harvesting from 54-70 days, fruitset from 66.21-95.02%, fruit weight per plant from 1-2 kg and fruit weight from 20.55-59.05 g. Potential productivity of PHT 7, PHT 11, PHT 12, PHT 13 and PHT 15 were higher 40 ton ha-1, therefore that genotypes have high potential for commercial varieties and proceed to multi-location trial. Heritability (high and medium) among observed characters indicated that genetic factors give more contribute in determining the phenotypic variability of plant.
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Judul: Evaluasi Daya Hasil 12 Genotipe Tomat (Solanum lycopersicum L.) dengan 3 Pembanding
Abstrak: The experiments was conducted to test resources yield of 12 genotype potential of tomatoes and get the genotype who has a higher yield and better qualities than commercial varieties. The experiments used Randomized Completely Block Design, single factor and three replications. The factor was 12 tomatoes genotypes potential and three commercial varieties (Intan, Ratna, dan Rampai) as a comparison. The results showed that there are potential tomatoes genotypes have good agronomic characters which genotype F6004001-8-16-14-1 and F6004001-8-16-14-7 (faster flowering and harvesting). F6004009-5-7-5-7 genotype showed a higher yield (1 032.63 g) than all genotypes, but not significantly different from the commercial varieties Intan (563.94 g), Ratna (666.85 g), and Rampai (640.85 g). On the character of total dissolved solids (PTT) and the hardness of fruit, F6005001-4-1-12-5 and F6005001-4-1-12-3 genotype have better quality than all the genotypes and commercial varieties. F6004009-5-7-5-7 genotype had the highest productivity value and potential to continue. The productivity was positively correlated with fruit weight and fruit thickness.
Keyword: variety, total dissolved solids, productivity, harvest, fruit hardness, 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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