Judul: Karakterisasi Tomat M I Hasil lradiasi Sinar Gamma 495 Gy
Abstrak: Penelitian ini bertujuan untuk memperoleh informasi keragaan tanaman tomat M1 hasil iradiasi sinar gamma dosis 495 Gy. Bahan yang digunakan merupakan 40 genotipe benih tomat hasil eksplorasi dengan perlakuan iradiasi sinar gamma 495 Gy. Penelitian ini dilaksanakan di Kebun Percobaan Leuwikopo dan Laboratorium Pasca Panen pada bulan November 2014 hingga Maret 2015. Karakterisasi dilakukan dengan membandingkan karakter kualitatif dan kuantatif antara genotipe M1 dan M0. Hasil penelitian menunjukkan perlakuan sinar gamma menyebabkan adanya keragaman pada keragaan genotipe, baik pada karakter kualitatif maupun kuantitatif. Terdapat beberapa genotipe M1 yang memiliki keragaan kualitatif berbeda dibandingkan kontrolnya yaitu Kefaminano 6, Kefaminano 4, Situbondo GL, Lombok 4, Lombok 1, Gondol 2, Kudamati 1, Aceh 1, Makassar 3, Bogor Cibanteng, Berlian, CLN 4046, dan Kemir. Berdasarkan bobot panen didapatkan tiga genotipe dengan produksi lebih unggul dibandingkan dengan tanaman kontrol yaitu Aceh 5, Lombok 4, dan Kefaminano 4.
Keyword: tomat, mutasi, sinar gamma, genotipe, karakterisasi

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: 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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