Judul: Karakterisasi Keragaman Genetik Beberapa Genotipe Tomat Lokal Hasil Induksi Mutasi
Abstrak: Tomato is one of the most important vegetables in Indonesia with increasing demand by increasing its population. The objective of this research was to obtain information of tomato genotype performance and morphological variability from induced mutation process. Genetic material of tomato genotype was obtained by germplasm exploration from different region in Indonesia. Local genotype was mutated by gamma rays at level 990 gray. The experiment research was conducted in September 2014 to January 2015 at Leuwikopo Experimental Field, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The characterization was conducted through variability comparison between tomato genotypes without irradiation (M0) and with irradiation (M1). The result of this research elucidated that there are variability in the performance of mutant tomato M1 generation i.e : plant height (cm), stem diameter (cm), flowering age (DAP), harvesting age (DAP), weight of fruit (g), average fruit weight (g), length of pedicel (cm), fruit length (cm), fruit diameter (cm) , fruit softness (mm g-15s-1), and total dissolved solids (ºbrix). The variability in the genotype still occurs seen from the variability performance of qualitative character. The genetic similarity was analyzed by clustering analysis. Clustering analysis from dissimilarity distance resulted that the genotype M0 and M1 is not different at the level of 0.77, indicated that the dissimilarity is low (23%). Dissimilarity coefficient elucidated that M1 and M0 is divided into two cluster. Value of heritability was varied between genotype and character. Clustering analysis for group of genotype M1 resulted different at level 0.5, indicated that the similarity is high (50%). Broad sense of heritability value if more than 50% was stated as high criteria, medium at 20% - 50%, and low if less than 20%.
Keyword: Bogor Agricultural University, characterization, gamma rays irradiation, genotype, Lycopersicon esculentum

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: 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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