Judul: Preferensi Pangan Anak Sekolah Dasar Di Kota Bogor
Abstrak: Food preference has an important role in defining children’s food pattern. Food preference that is formed earlier will persist to influence food preference in adult. In the other words, children’s food preference is a critical point in defining adult’s food preference. Thus, study about children’s food preference and many factors that were related is important to do. The general objective of this study was to identified factors that is correlate to food preference of school children in bogor city, and the specific objectivess were to: 1). Identified individual characteristic of subject, 2). Identified Family’s socio economics condition of subject, 3). Identified school children’s food preference, and 4). Analyze correlation between food preference and many factors. This study used cross-sectional design and the subject was 90 students from 3 elementary school in Bogor City. The correlation between factors and food preferences analized use inferensia statistics which are: Chi Square and Rank Spearman. Food preference of school children shows that school children tend to like certain kind of food in each food groups. There are several kinds of food in each foods group which is less like by school children. Fruits are liked by most school children. Most of school children like a kind of food because of the organoleptic characteristic of food, especially taste. Individual characteristics and family’s socio economic conditions explained little of the variation in school children’s food preference. The statistic test shows that preference of certain food has correlation with individual and family’s socio economic conditions. School children’s food preference doesn’t not show variety yet. Interventions are needed to direct school children’s food preference become more various.
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Judul: Konsumsi Buah dan Sayur pada Anak Sekolah Dasar menurut Status Sosial Ekonomi Berbeda di Kota Bogor
Abstrak: This research aim to examine the consumption of fruit and vegetable on elementary school children according to different socio-economic status in Bogor City. This research used the design of cross sectional study. Subjects taken in random who represents students who are registered in 20 elementary schools in Bogor City. There were no difference between the frequency of fruit and vegetable consumption of students in both groups of social economy. The contribution of vitamins A and C from fruit and vegetable consumption and the adequacy of the students were still low. There were no correlation between socio-economic families with the frequency of fruit and vegetable consumption, but there were a correlation between family size with vegetable consumption frequency, mother's education with the contribution of vitamin C in vegetable, and allowance with the contribution of vitamin C from vegetable consumption of students. There were no correlation between fruit and vegetable consumption frequency with the nutritional status of students.
Keyword: social economy, nutritional status, elementary school children, consumption of vegetable, consumption of fruit

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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