Judul: Heterosis dan Daya Gabung pada Persilangan HalfDiallel Cabai Besar dan Cabai Keriting (Capsicum annuum L.)
Abstrak: The aim of this research was to study estimation the heterosis and heterobeltiosis of fifteen hybrids, the general combining ability (GCA), and the specific combining ability (SCA) of six chili inbred lines of hybridization between big and curly pepper (Capsicum annuum L.). This research was conducted at Genetic and Plant Breeding Laboratory and IPB Experimental Field, Leuwikopo, Dramaga, Bogor, from September 2012 to March 2013. The experimental design used was randomized complete block design (RCBD) single factor with three replication. Plant materials were six chili inbred lines, fifteen hybrids from hybridization half diallel crosses, and two commercial hybrids. Genotype IPB C159 x IPB C120, IPB C159 x IPB C111, IPB C159 x IPB C5, IPB C120 x IPB C5, IPB C111 x IPBC2, IPB C19 x IPB C5, and IPB C5 x IPB C2 had positive heterosis, heterobeltiosis, and SCA values for some variables observed. All these genotypes had advantages that were better than the comparison of varieties TM 999 and Gada on some characters observed
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Judul: Pendugaan Daya Gabung dan Nilai Heterosis Hasil Persilangan Half Diallel Cabai Rawit (Capsicum annuum L.).
Abstrak: The aim of this research was to study estimation general combining ability (GCA) and specific combining ability (SCA) of six bird pepper inbred lines (Capsicum annuum L.), heterosis and heterobeltiosis of fifteen bird pepper hybrids in half diallel crosses. The experiment were conducted from November 2013 to April 2014 using a randomized complete block design (RCBD) with three replications at Leuwikopo University Farm, IPB. Analysis of GCA and SCA were based on the Griffing’s model of diallel design method II. Heterosis values were predicted based on the average values of their parents and heterobeltiosis were predicted based on the average values of the highest parents. Genotype IPB C10 x IPB C174, IPB C160 x IPB C291, IPB C174 x IPB C291, dan IPB C291 x IPB C293 had positive SCA, heterosis, and heterobeltiosis values for some variable observed. Genotype IPB C10 x IPB C174 dan IPB C160 x IPB C291 had higher yield for each plant than the commercial varieties which were Sonar and Nirmala
Keyword: heterosis, half diallel, combining ability, bird pepper

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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