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: Kebiasaan Sarapan pada Remaja Siswi Sekolah Menengah Kejuruan di Bogor
Abstrak: The study was aimed to describe breakfast habit in teenage girls of vocational high school Bogor. Design of this study was a cross sectional and the subject was 68 students 14–18 years old. Breakfast consumption was collected by a 7- day food record and verified by researcher. The result showed that there are 45.6% teenage girls having breakfast regularly. Breakfast frequency per week is associated with BMI and anaemic status. The subject mostly answer breakfast was defined as eating in the morning. Half of the subject answer breakfast was defined as eating in the morning is beneficial and the other answered eating in the morning consist of a solid food and beverage with medium portion. Food and drink for breakfast was good by subject is bread and milk. The subject declare breakfast is important, but also the subject ever not breakfast because wake up late. Almost all of subject declared should be mother who prepare breakfast and must breakfast at home before starting activity. The teenage girls having a good quality breakfast with higher consumption of rice, bread, fruit, and milk than teenage girls having a low quality breakfast with higher consumption of sweet tea and snack was found in anaemic status (13.2%). Mother education, mother occupation, parents income, and number of family member were related to habitual breakfast (p<0.05). There is positive associated between habitual breakfast and quality breakfast (p=0.000 ; r=0.539).
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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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