Judul: Keragaan dan Stabilitas Galur-Galur Padi Gogo Tipe Baru Hasil Kultur Antera
Abstrak: Breeding of upland rice is now directed towards new plant type (NPT) architecture. NPT rice lines have been obtained from anther culture and need to be evaluated in multilocation trials. The objectives of the research were to obtain information on agronomic characters, genetic parameters, yield potential, adaptability and stability of the lines. Ten lines and two cultivars were planted at seven different location in November 2010 – March 2011. In each location, the experimental design was randomized complete block design with four replications. Observation was done on agronomic characters such as plant height, number of vegetative tiller and productive tiller, panicle length, number of filled grains per panicle, empty grains per panicle, and total grains per panicle, 1000-grain weight, grain weight per plant and yield per hectar. The results showed FM1R-1-3-1 and Fat-4-1-1 rice lines has grain weight per plant 20.3 and 18.2 grams/plant respectively and other agronomic characters that were better than eight other lines. Genotype x environmental interaction factors contributed to variance by 16.6%. The highest productivity was achieved by FM1R-1-3-1 (4.52 ton/ha). FM1R-1-3-1 showed as genotype specifically adapted to favourable environments.
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Judul: Uji Daya Hasil Galur-Galur Dihaploid Padi Gogo (Oryza sativa L.) Hasil Kultur Antera
Abstrak: Dryland optimization is a strategy to increase national rice production through the development of upland rice. The upland rice production contributed for 5.28% of the national rice production. The objectives of this research was to obtain high yielding upland rice lines obtained from anther culture. The research was arranged in completely randomized block design (RCBD) with nineteen doubled haploid lines and three check varieties namely Inpago 10, Limboto, and Situ Bagendit with three replications. The results showed that the highest productivity was achieved by HR-5-7-1-1 (4.2 tonnes ha-1) and higher than Limboto (2.84 tonnes ha-1) and Situ Bagendit (2.95 tonnes ha-1). HR-5-9-1-1 (4.0 tonnes ha-1) showed higher productivity than Limboto (2.84 tonnes ha-1) and Situ Bagendit (2.95 tonnes ha-1). There were 10 lines selected to have similar productivity to Inpago 10, Limboto, and Situ Bagendit: HR-1-12-1-1 HR, HR-1-32-1-1, HR-2-22-2-1, HR-2- 27-2-7, HR-2-34-1-3 HR-3-6-2-1, HR-5-11-1-1, HR-5-13-2-2, HR-5- 9-4-1, and HR-7-15-2-1.
Keyword: dryland, upland, productivity, agronomic characters

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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