Judul: Pengujian Galur-Galur Dihaploid Padi Gogo
Abstrak: Demand for rice as a main food source of Indonesia's population continues to increase along with the population increase each year. An important input to increase rice productivity is the use of superior genotype. The good lines may be obtained through anther culture. This research was to study the agronomic traits and yield of doubled haploid lines of upland rice obtained from anther culture and compared to the check varieties Batutegi and Inpago 4. The study was conducted in field trials Babakan, University Farm, Bogor Agricultural University. Research was arranged in a randomized complete block design with four replications. Variables measured were vegetative plant height, generative plant height, number of vegetative tillers, number of productive tillers, flowering time, harvesting time, panicle length, number of pithy grain per panicle, number of empty grains per panicle, number of total grains, the percentage of pithy grain per panicle, the percentage of empty grains per panicle, weight of 1 000 grains, and grain yield per plot. The result showed that genotype gave very significant effect on the observed variables. There were lines whose productivity was higher than the check varieties: GM6, GM7, and GM8.
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Judul: Pengujian pendahuluan galur-galur dihaploid padi gogo hasil kultur antera
Abstrak: The objectives of this research were to obtain information the agronomy characters and yield potential of upland rice lines obtained from anther culture. An experiment was conducted at Sawah Baru Experiment Station, Babakan, Dramaga, Bogor in December 2014 - April 2015. Eighteen dihaploid lines and three check varieties namely Limboto, Inpari 13, and Situ Bagendit were evaluated. The research was arranged in completely randomized block design (RCBD) with three replications. There were 63 experiment of units with the size of each unit 0.6 x 3 m. The highest productivity was achieved by HR-1-12-1-1 (3.0 ton/ha) higher than Inpari 13 (1.9 ton/ha) dan Situ Bagendit (2.0 ton/ha). HR- 1-12-1-1, HR-1-32-1-1, HR-2-21-2-1, HR-2-27-2-7, HR-2-34-1-3, HR-5-9-1-1, and HR-5-13-2-2 had the same potential productivity with Limboto. This lines had the agronomy characters : height of plant (76.4 - 102.8 cm), the number of productive tiller (12.8 - 22.4), age of harvest ( 110 - 119 DAP), the number of grains/panicle (123.5 – 195.0 grains), weight of 1 000 grains (19.9 - 26.5 g), and productivity (2.4 - 3.0 ton/ha).
Keyword: Bogor Agricultural University, dihaploid, dihaploid, anther culture, upland rice, yield potential

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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