Judul: Uji Daya Hasil 12 Genotipe Buncis (Phaseolus vulgaris L.) di Tajur Bogor
Abstrak: The use of highland area for vegetable planting should be reduced to prevent land degardation in the future. Alternative approach is planting adapted superior varieties of kidney bean in lowland area. In order to identified superior variety of kidneybean in lowland area yield trials is neccesary. The objective of this experiment was to evaluate yield of 12 genotypes of kidneybean (Phaseolus vulgaris L.) adapted at lowland. This experiment was conducted at Bogor Agricultural University, Experimental Field, IPB, Tajur (250 m above sea level) in November 2013-January 2014, using Randomize Completely Block Design arrangement with single factor and four replications. The factor was 10 genotypes from exploring Java Island, Indonesia. Those genotypes were Lebat 2 (32.05 ton ha-1), Lebat 1 (34.68 ton ha-1), Sukabumi 1 PHTB 14 (33.11 ton ha-1), Garut 3 (34.19 ton ha-1), PHTB 17 (12.34 ton ha-1), PHTB 18 (8.45 ton ha-1), Garut 2 (25.99 ton ha-1), Bogor 2 PHTB 6 (36.94 ton ha-1), PHTB 15 (12.81 ton ha-1), PHTB 16 (16.31 ton ha-1), and two national varieties Lebat 3 (27.82 ton ha-1) and Horti 1 (3.48 ton ha-1) as checks. The result revealed that varieties exhibit significally different for all observed parameters, and Bogor 2 PHTB 6 genotypes showed highest yield.
Keyword: Phaseolus vulgaris L., lowland, genotypes

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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