Judul: Uji daya hasil galur kedelai (Glycine max (L.) Merr.) hasil iradiasi sinar gamma di tanah masam
Abstrak: Soybean ( Glycine max L. ) is one of the main commodity nuts in Indonesia because it is a source of vegetable protein important to diversify food. The objective of the research was to evaluate the yield of fifteen soybean lines gamma ray irradiation produced with two check varieties, namely Argomulyo as progeny and Tanggamus as drought acid tolerant varieties. The evaluation was aimed to gain information on the performance of agronomic characters of the advanced breeding lines of soybean and to select high yielding lines for released high yield variety soybean acid adaptability. The research conduted at folk’s field in Jasinga subdistrict, Bogor regency, in February 2012 – June 2012 as a part of preface trial. The design used was randomized complete block design (RCBD) with 3 replication. The research result showed that flowering time, harvesting time, number of productive node, number of total pod, number of seed/pod, and 100 seed weight were very significantly different among lines evaluated. Plant height, number of productive branch, number of filled pod, and number of total pod had positive correlated to seed/plant weight. Lines that showed of the good performance for the some characters to influenced the yield were M100-33-6-11, M100-96-53-6, dan M200-93-49-13.
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Judul: Pendugaan Daya Simpan Galur-Galur Kedelai (Glycine max (L.) Merr.) Hasil Iradiasi Sinar Gamma dengan Metode Pengusangan Cepat
Abstrak: The objective of the research was to estimate the varians on seed storability of soybean lines selected from population of gamma ray irradiation varietes Argomulyo, with two chek varietes, namely Argomulyo as wild variety and Tanggamus as drought acid tolerant variety. The research was conducted at the Laboratory of Plant Breeding and Laboratory of Seed Science and Technology, Departement of Agronomy and Horticulture , Bogor Agriculture University from March-August 2012. The research used Nested Plot Design, with 22 soybean lines and two control varietes nested within five perioed of accelerated ageing in 0, 20, 40, 60, and 80 minutes. The result showed that there was variations for character observed due to genetic factors. Character of viability and vigour observed had heritability higher than 50% except moisture content. There was significant and positive correlations among electrical resistance and character related to seed vigour except moisture content. If the seed germination was high, electrical resistance would be high. Electrical resistance had negative correlation with electrical conductivity. It means that electrical resistance could be applied as selection character for improvement seed vigour. M100-29A-42-10, M50-45-9-12, M100-96-53-7, M100-29A-42-15, M100-96-53-6, M200-20-52-11, M200-93-49-13 had good storability.
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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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