Judul: Respon Planlet Anggrek Dendrobium spectabile pada Pemberian Beberapa Taraf Paclobutrazol selama Tahap Aklimatisasi
Abstrak: The objective of this research was to determine the effect of paclobutrazol on Dendrobium spectabile planlet in acclimatization phase. This research used a complete randomized block design, with paclobutrazol concentration as treatment. There were eight level of paclobutrazol concentrations used 0 ppm, 10 ppm with twice and four times spraying, 20 ppm with twice and four times spraying, 30 ppm with twice and four times spraying, and 20 ppm pre soaked treatment. Each treatment repeated four times, so it consist of 32 units experiment. The result from this research are showed significant effect of paclobutrazol concentration application on planlet survived percent, length of the leaf, number of root, number of palisade cell, plant height, and thickness of leaf. The best response was shown by application of sprayed 30 ppm paclobutrazol four times. That showed 100% percentage of plantlets grown, the highest number of roots, the largest palisade cell, and the highest leaf thickness.
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Judul: Pengaruh Pemberian Paclobutrazol terhadap Pertumbuhan Planlet Anggrek Dendrobium lasianthera pada Tahap Aklimatisasi.
Abstrak: The objective of this research was to determine the effect of paclobutrazol to orchid Dendrobium lasianthera planlet in acclimatization stage. The research was conducted in green house, Cikabayan Department Agronomi and Horticulture IPB Dramaga, Bogor from Oktober to December 2011. The research was arranged in Completely Randomized Design, with paclobutrazol as a treatment.There were five concentration of paclobutrazol; 0, 5, 10, 15, and 20 ppm. Each treatment was repeated five times and number each treatment has 25 unit experiment. Each unit treatment has 10 planlet to grow, so total planlet in experiment is 250 planlet. The result from this research showed that the effect of application paclobutrazol was not significant for percent to grow, lenght leaf, colour leaf, number of root, length root, diamtre of root, plant height, number of shoot, diameter cell palisade, and weight of fresh plant. The range chlorophyl (a+b) is 0.4296 until 0.8477 mg/g, and the range number of cell palisade is 229.35 until 346.58/ mm2, The density of stomata is 50.96 until 86.64/ mm2.
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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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