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: Analisis keragaman perbanyakan stek nenas (Ananas comosus (L.) Merrill) varietas queen
Abstrak: The different propagules (suckers, shoots, slips, crowns) have already been described. When an industry is just starting it may be necessary to maintain special nurseries for fast propagation. The stems are cut lengthwise and are sectioned. In principle each bud can grow out to a new plant, provided their nutrition is assured and the apical dominance is broken. The different group should be kept separate and must be sorted for size, so that a field is planted with uniform material. In order to develop rapid method for propagation of pineapple, the experiment that employ three factors, i.e. the section of stem used for propagation (upper-stem, middle-stem, lower stem), the number of vertical division (two and four), and growth regulator (BAP 0 mg/I and BAP 4 mg/l), conducted under green house condition at Pusat Kajian Buah-buahan Tropika (PKBT), Baranangsiang, Bogor, from December 2002 to October 2003, evaluated 'Nenas Bogor's stems, taken from Desa Tajur Halang. It was arranged in Completely Randomized Design (CRD) with three replications. The obtained data was subjected to analyze of variance homogeneity, analyze of variance, and analyze of correlation. The result indicated the using of the upper-stem and BAP 4 mg/l gave the highest number of planted materials and the fastest breaking of apical dominance. The using of two sectioned stem gave the highest number of planted materials and simultaneously gaye the best performance of planted materials. The experiment described that small variation was found within cuttings propagations' population. The variant is duplicated or triplicated plant.
Keyword: 

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.
Keyword: