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: 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.
Keyword: