Judul: Kebiasaan Sarapan Hubungannya dengan Produktivitas Kerja Karyawan PT. Samick Indonesia
Abstrak: The objective of this research is to analyze the relationship between breakfast habits with the employees productivity of PT. Samick Indonesia. This research used cross sectional study design, and the method was observational survey. Breakfast could contribute energy, protein, iron (Fe), vitamin A, and vitamin C to the total intake as follows 12.47%, 13.19%, 24.44%, 20.00% and 3.01%. The average of nutrient intake from breakfast for energy 321±141 kcal/day, protein 8.02±4.51 gram/day, iron (Fe) 4.00±1.49 mg/day, vitamin A 114.38±129.38 RE/day, and vitamin C 2.59±5.34 mg/day. The result showed that sample who always breakfast is equal to 80.4%, but 56.5% of the sample who did the breakfast does not meet the productivity targets. This study showed that there was no significant relationship (p>0.05) between breakfast habits and employees productivity. But, there was significant (p<0.05, r=0.266) relationship between nutritional status and employees productivity. It’s shown by 23.9% with normal nutritional status meet the productivity targets. It is concluded that the breakfast habits of employees at PT. Samick Indonesia not yet showed work productivity is good, because the quality and the contribution of nutrients intake consumed at breakfast does not meet the needs of iron (Fe), vitamin A, vitamin C and specifically for the needs of energy and protein 20-25% and 15-25% of the total daily energy and protein required respectively (Depkes RI 2009). Finally, it is strongly advised for employees at PT. Samick Indonesia to improve the quality of nutrients intake consumed at breakfast, so that they can improve the work employees productivity and reach their intented target.
Keyword: Bogor Agricultural University (IPB), nutritional status, employees productivity, breakfast habits

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: 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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