Judul: Pengaruh jarak tanam terhadap ukuran dan kualitas buah nenas (Ananas comosus L.) varietas queen
Abstrak: The objective of the research was to evaluate the effect of plant spacing on the growth, fruit size and the quality of pineapples var queen. The experiment was conducted on May 2002 until June 2003 at Pasir Kuda, Bogor. The experiment was arranged in Randomized Block Design with two factors. The first factor was plant spacing between row (80 and 100 cm) and the second factor was plant spacing with in row (15, 30 and 45 cm). Obtained data were analyzed by analysis of variance (ANOVA) and mean separation was determined by Duncan's multiple range test at p ≤ 0.05. The result after harvesting at 13 months indicated that both of the plant spacing, treatment was not significantly influenced to stem height, leave width, leave number, fruit weight, fruit diameter, core diameter, crown length, crown weight, fruit length, crown leave number, juice pH values, total soluble solids, deep eyes, slips number and suckers. In this experiment plant spacing was not significantly affected to fruit size and quality of fruit. Significant differences were found in shoots number inside row plant spacing. The treatment of plant spacing was significantly effected to yield. The yield was higher in row plant spacing 15 cm (36.82 ton/ha), than in plant spacing between row 45 cm (14.29 ton/ha). The shoots number were higher inside plant spacing in the row 15 cm (19.97) but it was slightly lower to slips number and suckers.
Keyword: analysis of variance, Randomized Block Design, leave width, leave number

Judul: Pengaruh ukuran bibit terhadap pertumbuhan, produksi dan kualitas buah nanas tipe queen
Abstrak: The objectives of this experiment is to elucidate the effect of sucker size on growth, production and fruit quality of pineapple type Queen. The expriment was conducted at the IPB research field, Babakan Pasir Mas, Pasir Kuda Village, Ciomas Bogor, West Java from Mei 2002 until Mei 2003. The experiment was arranged in the Randomized Complete Block Design with single faktor of pineapple sucker weight consist of four suckers size they were sucker U, -35.0 gr -101.5 gr, sucker U₂ 101.6 gr 168.1 gr, sucker Us 168.2 gr-234.0 gr, sucker U₁234.1 gr - 300 gr. Analysis of variance results showed that suckers size significantly effects on plant heigths, number of leaves, the wide of leaves, shoot number, fruit weight with crown for fruit sample, fruit weight with crown for total population, fruit weight, fruit size, fruit diameter, crown height and total soluble solid. The size of suckers has no significant difference on sucker number, slips number, peduncle diameter, fruit crown height, the number of crown leaf, the depth of the fruit eye and fruit pH. Correlation analysis indicates that the increase of pineapple sucker size will cause increases of plant height, total leaf, leaf width, total sucker, fruit weight include crown for fruit sample, fruit weight include crown for total population, fruit weight, fruit length, fruit diameter and total soluble solid.
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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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