Judul: Pengujian daya hasil galur-galur padi gogo hasil kultur antera dan resistensinya terhadap penyakit blas daun (Pyricularia grisea)
Abstrak: The objective of the research was to obtain high yielding and blast resistant line of upland rice. Research consisted of three experiments. First yield trial was conducted in Bogor from May-September 2008. Second trial was conducted in Sukabumi from November 2008-March 2009. Resistant study to blast disease was conducted in Sukabumi from November 2008-March 2009. Sixteen doubled haploid lines and four varities (Jatiluhur, Limboto, Batutegi and Cisokan) were used in the two trials. Genotypes IW-54, IW-67, WI-43, WI-44, GI-7, IG-19, IG-38, B13-2e (ranged 3,33-3,77 ton/ha) have the same yield or higher than control Batutegi (3,50 ton/ha), but they are lower than control Jatiluhur (4,71 ton/ha) and Limboto resistant control (5,35 ton/ha). Genotype IW-54, IW-56, IW- 67, WI-43, WI-44, IG-7, O18b-1, GI-19, GI-38, B13-2a, B13-2d, B13-2e, dan D19-1 were resistant to leaf blast disease. Genotype IW-64, A3-2, and A3-7 were susceptible to blast based on disease incidence. Genotype A3-2 and A3-7 were susceptible to leaf and neck blast. IW-54, IW-67, WI-43, WI-44, GI-7, IG- 19, IG-38, and B13-2e have blast resistance and high yield potential, low to medium amylase, low-high gelatinization temperature. It is suggested that those potential lines to be tested further for multilcation trials.
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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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