Judul: Daya Hasil Galur Harapan Tomat (Solanum lycopersicon L.) di Dataran Rendah
Abstrak: The objective of this experiment was to evaluate yield for tomato’s lines (Solanum lycopersicon L.) at lowland. The experiment was conducted at PKHT Experimental Field, Tajur, Bogor in January-April 2013. Experiments used randomized completely block design, single factor and three replications. The factor was genotype that consisted of IPB T3-8-3, IPB T8-5, IPB T30-4-3, IPB T33-1-3, IPB T34-7-10, IPB T43-6-8, IPB T53-3-1, IPB T57-3, IPB T60-2-2, IPB T64-2-3, IPB T65-6, IPB T78-10 genotypes, and three comercial varieties (Intan, Ratna dan Karina) as controls. The results showed that the genotypes significantly affect the overall character. IPB T65-6 and IPB T64-2-3 were genotypes that showed no different performance for fruit width, fruit length, fruit weight, fruit flesh density, total dissolved solid, and vitamin C content compared with comercial varieties as controls. Days of harvesting of IPB T65-6 was earlier than comercial varieties. Agronomically, IPB T65-6 genotype which planted in lowland at Bogor had same yield compared with Ratna and Karina as control. Heritability (high) observed among all characters indicated that genetic factors give more contribute in determining the phenotypic variability of plant. All genotypes had close relationship, shown by the form of seven clusters with 89 % similarity. Factor of yield component was positively correlated with productivity. All genotypes were well adapted in lowland at Bogor.
Keyword: yield evaluation, Solanum lycopersicon L, lowland, line, comercial varieties

Judul: Uji Daya Hasil 12 Genotipe Tomat (Solanum lycopersicum L.) di Dataran Rendah (Tajur, Bogor).
Abstrak: Development of tomato which is adaptive in lowland is important because land availability in the highlands being limited. The study aims to test and compare the yield and quality of 10 genotypes with two compared varieties grown in the lowlands. The study uses Randomized Completely Block Design one factor with three replications. Materials used are 10 potential tomato genotypes and 2 compared varieties, Intan and Ratna. Observations were conducted on 13 qualitative characters which include hypocotyl color, growth type, leaf types, leaf attitude, leaflets attitude, infloresence type, flower color, fruit shape, fruit blossom end shape, color of immature fruit, color of ripe fruit, flesh color, shape of pistil scar, and 17 quantitative characters which includes plant height, leaf size, pedicel length, number of locules, number of inflorescence, number of flowers per inflorescence, fruit set, number of fruit per plant, days to flowering, days to harvesting, fruit size, flesh thickness, weight per fruit, fruit weight per plant, productivity, fruit hardness, total soluble solid (PTT). The results showed that tested genotypes have different character in leaf attitude, fruit shape, and fruit blossom end shape compared with varieties Intan and Ratna. Genotype that can be continued for multilocation field trials is F8 005001-4-1-12-3-17-3 genotype because it has a length fruit (5.55 cm), flesh thickness (0.69 cm), pedicel length (3.1 cm), and leaf width (33.48 cm) better than the two compared varieties, yields (45.24 ton/ha) and fruit set (70.8%) as well as both compared varieties, weight per fruit (73.03 g ), fruit diameter (4.99 cm), and PTT (1.58 oBrix) better than varieties Ratna, and plant height (76.77 cm), fruit number per plant (39), fruit weight per plant (1 413.70 g), and fruit hardness (1.35 kgf cm-2) higher than varieties Intan.
Keyword: genotype, lowland, productivity field trial, Solanum lycopersicum L., tomato

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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