Judul: Pendugaan Parameter Genetik dan Kualitas Buah Pepaya Hibrida
Abstrak: This study aims to obtain a hybrid papaya varieties that have a high heterosis value to be released into new varieties. The research was conducted in May 2011 to May 2012 at Research Station PKHT IPB Tajur (250 m asl) and at post-harvest laboratory PKHT Baranang Siang, Bogor, West Java. This study used six genotypes consist of 3 hybrid genotypes IPB H93, IPB H91, IPB H39 and parent genotypes IPB 9, IPB 3 and IPB 1. Quantitative parameters were observed that plant height; first fruit position; amount of fruit, flower and leaves per plant; stem diameter; fruit diameter, fruit length and circumference of fruit; whole fruit weight, edible portion, 100 seed weight, and the whole seed weight; the skin and flesh firmness; flesh thickness; total soluble solid (obrix); juice pH; total tritated acid; vitamin C. Qualitative parameters were observed that fruit skin color, flesh color of ripe fruit, fruit shape, and the dominant central cavity. The result showed that hybrid genotype IPB H91 had a lot of character superior to the other between hybrids genotypes and had the better character than the parents.
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Judul: Pengujian Pertumbuhan Tiga Genotipe Pepaya Hibrida (Carica papaya L.).
Abstrak: The research aims to examine the growth and character of three genotypes of hybrid IPB 9 x IPB 1, IPB 9 x IPB 3, and IPB 3 x IPB 9 genotypes in vegetative phase. This research was conducted at The Experimental Field Station PKBT IPB, Tajur Bogor from March to September 2011. The experiment use a randomized complete block design with six genotypes of papaya treatment. The repetition was done six times, with each unit of the experiment are five representative plants. The observation of plant growth per week was perfomed on plant height and leaf number. The observation of petiole colour, trunk diameter, petiole length, leaf length, leaf width, times of the first flowers appear, and the height position of the first flower was done once at the end of the observation that was in the week when the first flower appear. The results showed that IPB 9 x IPB 1 genotype has higher average in leaf number and trunk diameter and shorter average in height position of the first flower appear than another genotypes hybrid of papaya. Genotype of IPB 9 x IPB 3 has shorter average in plant high and smaller size in leaf which not different with IPB 9 x IPB 1. The hybrid genotypes of papaya which tested have a short score of heterosis and heterobeltiosis generally. Based on the estimation value of heterosis, genotype of IPB 9 x IPB 1 can be an alternative in obtaining hybrid because it has more superior character than two other hybrids, that of them is have higher in leaf number, bigger in trunk diameter and strong trunk, and shorter in height position of the first flower than parents genotypes.
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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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