Judul: Asupan Energi, Zat Gizi, Serat dan Aktivitas Fisik Siswa Sekolah Dasar dengan Status Gizi Gemuk dan Normal di Bogor
Abstrak: Prevalensi anak sekolah yang kelebihan berat badan dan obesitas di Indonesia semakin meningkat. Angka nasional tahun 2010 menunjukkan prevalensi kelebihan berat badan sebesar 9,2%, sedangkan di perkotaan Bogor anak sekolah kelebihan berat badan dan obesitas sebesar 22,3%. Penelitian ini menggunakan desain studi cross sectional yang dilakukan di tiga sekolah dasar pada bulan September dan November 2011. Penelitian ini menggunakan teknik kuesioner dan wawancara. Tidak terdapat perbedaan yang signifikan (p>0,05) karakteristik keluarga antara sampel normal dan obesitas. Uji Independent Sample T-test menunjukkan tidak terdapat perbedaan bermakna (p>0,05) asupan energi, lemak, karbohidrat, dan serat antara sampel normal dan obesitas. Namun terdapat perbedaan yang signifikan (p<0,05) pada asupan protein antara sampel normal dan obesitas. Hal ini juga menunjukkan bahwa tidak ada perbedaan yang signifikan (p>0,05) pada lama waktu menonton televisi dan bermain game antara sampel normal dan obesitas. Korelasi Pearson menunjukkan bahwa tidak terdapat hubungan yang bermakna (p>0,05) antara asupan energi, lemak, karbohidrat, dan serat dengan status gizi, namun terdapat hubungan yang bermakna (p<0,05) antara asupan protein dengan status gizi. Tidak terdapat hubungan yang bermakna (p>0,05) antara lama menonton televisi dan bermain game/komputer dengan status gizi.
Keyword: Intake energy, Nutrients, Fiber, Physical Activity Elementary School Children

Judul: Asupan Energi, Zat Gizi dan Serat serta Aktivitas Fisik Siswa Sekolah Dasar Berstatus Gizi Lebih di Kota Bogor
Abstrak: This study were aimed to analyze energy, nutrient intake and physical activity of overweight and obese elementary school student and correlation between energy, nutrient intake, physical activity and family characteristics of students with nutritional status BMI/U. A cross sectional study of 99 subjects was conducted. The intake of energy, protein, fat and carbohydrate was 1777 kcal, 57 g, 53 g and 340 g. Most of the students were deficit of energy, fat, calcium, phosporus, vitamin A, vitamin C and fiber, while protein, carbohydrate and iron were adequate. Physical activity levels of students classified mostly light or sedentary activity. There was no significant relationship between energy and macronutrients intake with BMI/U (P> 0.05). There was a significant correlation between the nutritional status of IMT/U with a family income level, father's education and maternal education (p<0.05).
Keyword: overweight and obesity physical activity, nutrient intake, elementary school student

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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