Judul: Analisis biplot dan procrustes untuk mengkaji pengaruh pemangkasan (ratoon) pada berbagai tanaman sorgum (sorghum bicolor I)
Abstrak: In the means of food stuff diversity, the sorghum can be used for the alternative of carbohydrate resource. As a food resource, this sorghum has many advantages, for example high productivity, dry resistance in accordance with another second crops. It's capability to grow in an appropriate land, the available seed to usc for many purpose. And its resistant for long time preserve. Another advantages is sorgum can be cutted off (ratooned) for 2-3 time in equal productivity with it's main plant. To get visual appearance of sorgum characteristic principally in dry seed weight variable which indicate the level of productivity on the main plant and ratoon biplot analysis were use. Meanwhile to compare the characteristic of similarity level we use procrustes analysis. Before analysis, elintinate tile six variety that perish after tile cutting off (ratoon), so only 94 of 100 variety that being used.
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Judul: Analisis Lintas Beberapa Karakter Agronomi untuk Pengembangan Kriteria Seleksi Tanaman Sorgum (Sorghum bicolor L. Moench)
Abstrak: Almost all parts of cereal sorghum plants can be used, so that sorghum needs to be cultivated and improved quality. Sorghum quality improvement can be done through plant breeding. One of the agronomic characters that need to be improved agronomic quality is yield plants. Sorghum yield was also be affected by other agronomic characters. The great effect on the agronomic characters crop yield can be determined by path analysis and levels of inheritance properties can be determined based on the value of heritability. Agronomic characters under study is the production of dry seeds, total biomass production, biomass production without seeds, 50% flowering, panicle length, plant height, maturity, weight of 1000 seeds, panicle weight, stem diameter, and number of stem segments. The results of this study indicate that yield based on the production of dry seeds (PBK) and total biomass production (PBS) was the most dominant effect of the increase in panicle weight (BM) so BM can be used as selection criteria sorghum plants with moderate levels of heritability. In addition, panicle length (PM) can also be used as selection criteria sorghum because PBS was the most dominant effect of the increase in PM with a high degree of heritability. Yield based on biomass production without seeds (PBTB) was not affected by other agronomic characters.
Keyword: sorghum, path analysis, heritability

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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