Judul: Hubungan Kebiasaan Sarapan dengan Status Gizi dan Prestasi Siswa SMA N 1 Pangururan Kabupaten Samosir
Abstrak: The aim of this study was to analyze the correlation of student’s breakfast habit to nutritional satus and academic performance. A cross sectional study was conducted in this study. Subjects were 35 female student and 35 male student. The result showed that male student (77.14%) and female student (85.71%) have normal nutritional status. The level of nutrition knowledge of male student (82.86) and female student (82.86%) were classified good. Breakfast frequency of female student (65.71%) more regular than male student (51.43%). Most of subjects were don’t have enough time to breakfast. Energy and protein adequacy were 25.25% and 18.26% from breakfast. Subjects academic level (58.57%) were classified as good category. Spearman rank correlation showed a not significantly correlation between nutrition knowledge and nutritional status (p>0.05). However, there was a significant correlation between breakfast and academic performance (p<0.05)
Keyword: Bogor Agricultural University (IPB), nutritional status, nutrition knowledge, breakfast, Academic performance

Judul: Kebiasaan Sarapan, Konsumsi Buah dan Sayur, dan Status Gizi Siswa Sekolah Menengah Pertama di Bogor
Abstrak: Fruits and vegetables are very important for consumption, especially for school-age children and adolescents. The purpose of this study were to analyze breakfast habits, fruits and vegetables consumption, and students’s nutritional status of junior high school in Bogor. The design of this study was cross-sectional with purposive sampling technique as much as 50 students in SMP Negeri 8 Bogor. Fruits and vegetables that consumed by students was included low as category. The result showed there was male students consumed breakfast more frequent than female students. Students’s nutritional status were categorized as normal. Correlation test showed there were no significant relationship (p>0.05) between individual and family characteristic, except households income with breakfast habits. There were no significant relationship (p>0.05) between individual and family characteristic, availability of fruits and vegetables at home, and parental habits of fruits and vegetables consumption, except households income with students of fruits consumption. Breakfast habits and fruits and vegetables consumption there were no significantly associated (p>0.05) with students’s nutritional status.
Keyword: Bogor Agricultural University (IPB), students, nutritional status, fruits and vegetables, breakfast habits

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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