Judul: Simulasi Uji BUSS (Baru, Unik, Seragam, dan Stabil) pada Jambu Biji di Kebun Percobaan PKHT, Pasir Kuda, Bogor
Abstrak: This experiment was conducted to study the Distinctness, Uniformness, and Stability (DUS) of guava varieties, so that the data can be used to verify the Test Implementation Guidelines (PPU) in the DUS test. The experiment was conducted at PKHT experiment station, Pasir Kuda, Bogor. This experiment was conducted using a Complete Randomized Design, one factor with incomplete replications, based on UPOV guidelines. The guava varieties evaluated were Sukun Putih, Variegata, Mutiara, Getas Merah, Kristal, Bangkok, Seedless, Super Red and Sukun Merah. The DUS test simulation results showed that 35 of 40 characteristics were different, it consisting of 3 tree characteristic, 12 leaf characteristic, 3 flower characteristic, 15 fruit characteristic, and 2 recommended characteristic, so can be called as distinctness. The result also showed that no varieties with offtype, so can called as uniform and stabile. We conclude that the verification for the PPU of DUS test is appropriate and can be used for condition in Indonesia, with a few addition of new characters that not written in UPOV guidelines. The results of this research can also be useful to determine the variety of the samples.
Keyword: 

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.
Keyword: 

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.
Keyword: