Judul: Estimation of Genetic and Stability Parameters for Yield and Yield Components of Peanut (Arachis hypogaea (L) Merr.), Pendugaan parameter genetik dan parameter stabilitas hasil dan komponen hasil kacang tanah (Arachis hypogaea (L) Merr)
Abstrak: Genetic parameters for number of total pods, munber of seeded pods, number of unseeded pods, number of seeds, 100 seed weight (gram), pod weight (gram/1,4 m2), and seed weight (yield)(gram/1,4 m2) were estimated from field in a split plot design with 3 replications at 3 locations (Cikeumeuh, Sukamandi, and Kuningan). There main plots werw used, i.e. the peanuts werw grown in monoculture and in assosiation with maize grown at 7 and 15 days after the peanuts werw planted, respectively. There growing environments used in this study were to create a greater environmental variation. It was done becouse many peanut famers are still planing this crop either in monoculture or associated with maize in Indonesia.
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Judul: Karakteristik Pertumbuhan dan Produksi Delapan Varietas Kacang Tanah (Arachis hypogaea L.).
Abstrak: The research was aimed to indentify the growth characteristics that influence filling of the pod and productivity of the groundnut. This research was conducted at Leuwikopo Experimental Field, Departement of Agronomy and Horticulture, IPB, Dramaga, on February to June 2010. The method of this research was based on a completely block randomized design, consisted of one factor and three repetitions. The factor was eight varieties, namely Pelanduk, Sima, Gajah, Turangga, Panther, Anoa, Kelinci, and Kidang. The data was analyzed by using F test. If there was significantly difference then it would be followed by Duncan Multiple Range Test (DMRT). The result showed that varieties affect signifficantly to the total of leaves, branch, and peg, weight of leaves, branch, and peg, and lenghth of the plants in several weeks of observations. Each varieties has difference characteristics of gowth and production. Pelanduk had highest growth characteristics. Gajah was the fastest on pod filling. Panther had highest growth parameter and production variables. Anoa was not really good at growth characteristic and pod filling so the productivity was low. Kidang had high dry matters and good at pod fillling. Sima, Kelinci, and Turangga had high total pod, but not so good at pod filling.
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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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