Judul: Uji stabilitas tujuh hibrida harapan melon (Cucumis melo L.) hasil rakitan Pusat Kajian Buah-Buahan Tropika (PKBT) IPB pada dua musim
Abstrak: The aim of this experiment was to analyzing the genetic stability of seven hybrid genotype melons of PKBT at two different seasons, rainy dan dry season. This experiment was conducted in PKBT's field test, Tajur which located at 400 m over sea level with 26°C daily temperature and 3500 mrn rainfall per year. Experiment during March until August 2006.
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Judul: Evaluasi karakteristik hortikultura hibrida melon, Cucucmis melo L. introduksi dan hasil rakitan Pusat Kajian Buah-Buahan Tropika (PKBT) IPB
Abstrak: The objective of this experiment was to evaluate and characterize horticultural traits of introduced and PKBT’s melon hybrids and to identify the potential PKBT’s hybrids compare to those of the commercial introduced hybrids. The evaluated hybrid varieties consist of introduction hybrids are Ten Me, Angel, Honey Globe, New Charm, New Century and Apollo and PKBT’s melon are H150 and H7. The experiment was conducted at KP IPB Tajur 2 from September to November 2006 using Randomized Complete Block Design with three replications. The genotype variability was analyzed using analysis of variance method. The result showed that there are significant differences for all characters, except on days of male flowering dan days of hermaphrodite flowering. The experiment also shows a negative correlation between fruit length character and Total Solutable Solid (TSS) and a positive correlation between stem diameter character and TSS. H150 is a PKBT’s Cantaloupe melon hybrid that had a good vegetative growth, orange flesh, high TSS (10.02%Brix) and skin hardness, round shaped fruit and perfect net. H7, an Inodorus cultivar, has some potential characteristics. This hybrid has good vegetative growth, good appearance of fruit, white flesh and the highest TSS (10.50%Brix) than the other Inodorus hybrids. PKBT’s hybrids has higher stem diameter, harder fruit and higher TSS but has longer day to harvest than introduced hybrids. Var. Cantaloupensis has higher stem diameter and skin hardness but has lower fruit weight and longer harvest day than var. Inodorus.
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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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