Judul: Aplikasi Daminozide Pra Tanam Menggunakan Teknik Perendaman dan Vacuum Infiltration pada Bibit Tanaman Krisan Pot.
Abstrak: The aim of this research was to study the effect daminozide applications with several concentrations using the vacuum infiltration and immersion techniques on the growth of potted chrysanthemum. This research was conducted in laboratory and experimental field of Research Institute of Ornamental Plants, Pacet District, Cianjur Regency, West Java, from February until July 2010. The design of the research using Split Plot design. The main plot consisted of five levels of daminozide (Alar consist of 85% daminozide), which are 0.213 g/l, 0.425 g/l, 0.850 g/l, 2.125 g/l, and 4.250 g/l. The subplot consisted of two daminozide application techniques, using vacuum infiltration and immersion techniques. The result of this study indicate that vacuum infiltration or immersion technique did not significantly affect to the observed characters. Daminozide concentration applied significantly affected to number of shoots, the main stem height at 2 weeks after planting pre pinching, plant height, number of leaves, the total number of flowers, flower stem length, and carotenoid content. Interaction of concentration and application techniques of daminozide showed significantly different results on the main stem height at 7 weeks after planting and anthocyanin content.
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Judul: Induksi Keragaman Dua Varietas Krisan (Dendranthema grandiflora Tzvelev) Dengan Iradiasi Sinar Gamma Secara In Vitro
Abstrak: The research aims were to study the effect of gamma irradiation doses on Chrysanthemum (Dendranthema grandiflora Tzvelev) and increasing the genetic diversit. The research were conducted at IPB Tissue Culture Laboratory, BATAN Laboratory, and IPB Micro Tehnique Laboratory, during February–November 2010. This research used completely randomized design with two factors. The first factor is varieties of Chrysanthemum, including Dewi Ratih and Puspita Nusantara. The second factor is five doses of gamma irradiation (0, 20, 40, 60, 80 Gy). The result showed that the interaction between varieties with doses of gamma irradiation affected growth of plants and the number of chloroplast in guard cell. The number and size (length and width) of stomata were influenced by a varieties and and irradiation dose as a single factor. Increasing doses of gamma irradiation could increase the length and width of stomata. LD50 of krisan planlets were obtained 22.22 Gy for Dewi Ratih and 22.85 Gy for Puspita Nusantara. The gamma radiation dose 20 Gy produced 13 potential mutant on Dewi Ratih and Puspita Nusantara varieties. Putative mutants characteristic showed small leaves and no serrated, reddish stems, stunted, rosette, and variegata leaves.
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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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