Judul: Simulasi Uji BUSS (Baru, Unik, Seragam, Stabil) Enam Varietas Nenas (Ananas comosus L. Merr.)
Abstrak: The objective of this experiment was to elucidate the characters of the distinctness, uniformity and stability of the six varieties of pineapples, as simulation nDUS test important for the Plant Variety Protection Rights application. The experiment was conducted at Pasir Kuda experimental field, Bogor, West Java. The experimental materials consisted of five candidates varieties are Dole 14, P-1972, Mayan Gold 01, Champaka, Pasir Kuda and Subang as reference variety. The result showed that six varieties can be deemed to be dictinct. The distinctness between candidates varieties with reference variety consist of seven characters on the plant, six characters on the leaves, four characters on the flower, nineteen characters on the peduncle and fruit. Six varieties can be deemed to be uniform and stable. Off-type are found only in one plant with two crown Subang variety. The number of off-types are still under uniformity limits standard.
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Judul: Simulasi Uji Baru, Unik, Seragam, dan Stabil (BUSS) Pisang (Musa spp.) di Kebun Percobaan Pasir Kuda, Bogor
Abstrak: The experiment was conducted to elucidate the characters of distinctness, uniformity and stability (nDUS) test for seven varieties of bananas and plantains that was ambon hijau (AHM), cavendish (CVS), kepok kuning (KKU), kepok unti sayang (KUS), pisang ungu (PUG), pisang lampung (PLP), and pisang mas kirana (PMK) that for simulating the nDUS test important for the plant variety protection right application. The experiment held at experimental field Pasir Kuda, Bogor. Data has been processed with model randomized completely design. The accession conducted in every part of plant, with the sub accession at pseudoterm stem, plant, leaf blade, peduncle, bunch, male inflorescence, rachis, and fruit that used test guidlines TG UPOV 123. The results showed that 50 different characters found from 52 characters in TG UPOV between candidate varieties and refernce variety. The difference could be expresed that the candidate varieties had distinctness character. The uniformity and stability was categorized when the candidate varieties have not off type character and the source for propagation was from vegetative. The distinctness or the differences used for getting the example varieties. The example varieties that used to make the next test guidlines.
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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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