Judul: Genetic parameter analysis  and  development of selection criteria for pineapple  improvement (ananas comosus (l.) Merr.) in Indonesia.
Abstrak: Information of genetic variability, heritability an d correlation between quantitative characters with yields is very important to support Pineapple Hybridization Program in Indonesia. This study has been conducted in four topics namely: (1) estimation of genetic parameters at some quantitative characters of pineapple germplasm, (2) study on correlation between some quantitative characters of pineapple germplasm, (3) study on genetic variability of pineapple crosses based on morphology and RAPD markers, (4) multivariate analysis and selection of the PKBT ‘Queen’ x ‘Smooth Cayenne’ hybrid collection for superior high yield and fruit quality. The objectives of the first topic were to examined the genetic variability and heritability of the agronomic characters of germpla sm collection. A total of 26 accessions of pineapple germplasm collection were used in this study. The results of the research showed that the leaf number, leaf l ength, number of hapas, days to flowering, days to harvest, peduncle length, peduncle diameter, fruit weight, fruit length, number of spirals, flesh thickness, total acid and vitamin C content have wide genetic variability. The leaf number, leaf length, number of hapas, number of suckers, days of flowering, days to harvest, fruit length, number of spirals, flesh thickness, total acid and vitamin C content have high heritability value. The characters which have high genetic gain (> 50%) were peduncle length and vitamin C content.
Keyword: morphology marker, RAPD marker, independent culling level selection, truncation selection, selection index

Judul: Genetic diversity analisis on pineapple (Ananas comosus (L.) Merr.) by random amplified polymrphic dna (RAPD)
Abstrak: Pineapple is belong to the Bromeliaceae, a large family of American tropics (only one species originated from Africa) which has 45 genera and 2 000 species. Out of six species of pineapple, Ananas comosus (L.) Merr. is the only species grown commercially for its fruit (Nakasone and Paull, 1998). To date, world cultivation just based on six cultivars, i.e., Cayenne, Queen, Singapore Spanish, Red Spanish, Abacaxi and Perolera, while the first three have been the genetic base of distribution from the original area. In Indonesia, cultivars that recommended by Department of Agriculture are only Queen (Bogor pineapple and Palembang pineapple) for fresh fruit and Cayenne (Smooth or Lisse) for processing uses and assumed to have low genetic variability. In this study, 17 accessions of pineapple (Ananas comosus (L.) Merr.) were evaluated for their morphological performance and subjected to analysis of Random Amplified Polymorphic DNA (RAPD). Eight morphological characters of the accessions were measured to examine their morphological relationship. For RAPD analysis, thirteen primers of 10-mers were used to amplify the genomic DNA of the pineapple accessions. Out of them, three random primers yielded monomorphic products while the remaining amplified a total of 20 (87%) fragments, all of which were polymorphic, with an average of 1.77 fragments per primer. A dendogram based on UPGMA-link method and principal component analysis (PCA) plots were examined the clustering pattern and distribution of the accessions, both for morphological characters and amplification products. As the result, RAPD analysis showed higher coefficient of similarity between pineapple accessions tested rather than morphological's, which may indicate the high environmental influence on the morphological performance. This study was demonstrated that RAPD analysis was able to detect genetic similarity among accessions in one species, eventhough among all primers used, there was no single primer could distinguish between Queen and Smooth Cayenne group of pineapple tested. ...
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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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