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: Pengaruh perbedaan jenis bibit dan perlakuan BAP pada fase peprbanyakan kultur jaringan terhadap keragaan populasi generasi kedua nenas queen di lapang
Abstrak: The aim of this research was analyzing the performance attain from various kinds of vegetative propagates and BAP previous treatment in in vitro to the second generation of pineapple in field-testing. This research was conducted in Tropical Fruit Research Center, Tajur, located at 400 m over sea level, 416 mm rainfall per month, and temperature was about 25-31 OC. Research started on May 2005 until August 2006. The design used was Factorial Randomized Complete Block Design with two factors. In the other hand, kinds of vegetative propagates was divided into three, ratoon, sucker, and crown. Each combination was repeated three times while for crown not repeated due to lack of supply. BAP treatment as a factor given in four levels, 0.5 mg4, 1 mg4, 2 mg4, and 4 mgll. BAP had given in in vifro multiplication stage. Total of material was 545 plants and observation brought about to 280 plants. A cultural activity such as fertilization, weeding, and pest controlled applied in certain times. Fertilization given in three times with different dosage. Weeding was done manually depend on the plantation's condition. Pest controlling executed to the plantation twice. Insecticide and rodenticide was the materials for controlling the pests. Variable observations included vegetative growth (plant diameter, plant height, leaf length, leaf width, and numbers of leaf), post-harvesting (numbers of leaf on peduncle, numbers of crown, peduncle length, fruit weight, crown weight, total weight of fiuit, fruit length, crown length, fiuit diameter, cup depth, edible portion, core width, acidity, and total soluble solid), and the numbers of vegetative propagates (ratoon, sucker, hapas, and slips). Observation on vegetative growth conducted 11 times at 2-13 month after planting. Post-harvesting observation had done directly after harvesting. The condition of plantation was good Several weed, pests, and diseases found with no significant effect to the plantation. The variation that occurred was the rapidity of flowering and harvesting time. From the observation concluded that BAP treatment affected leaf length and total weight of fruit. Different kinds of vegetative propagate affected total weight of fruit and cup depth.-This result considered good, because the BAP treatment gave no declining effect on cultivation in field. Therefore, that BAP considered not affecting on growth stability. Different kinds of vegetative propagate also gave no significant difference. In quality, fruits dominantly conical in shape.
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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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