Judul: Kebiasaan Jajan Anak Sekolah Dasar di SD 036, SD 070 dan SD Muhammadiyah 5 Kota Pekanbaru
Abstrak: The purpose of this study was to examine the habits of eating snacks among the school children at SD 036, SD 070 and SD Muhammadiyah 5 in the town of Pekanbaru. This was a cross sectional study with the subjects of 108 children in Grades 4 and 5(10-12 years). The data on the habit of eating snacks were collected by using a 2x24 hour Food Recall and Food Frequency (FFQ), processed using Nutrisurvey, Microsoft Excel 2007 and analyzed using the Statistical Program for Social Science (SPSS) 16.0 for Windows. The Spearman correlation results indicated there was a significant positive relationship between parent’s (mother and father) education and the number of major foods and beverages, while on the food frequency mother’s education had a significant and positive correlation with the main meal snacks and beverages. The Spearman correlation results also showed a significant negative relationship between mother’s education and the habit of eating snacks (number of snack types and frequency) and between father and mother's education and fruit snack habit (number of snack types and frequency). Further, the Spearman correlation results indicated that there was a significant positive relationship between family income and the habit of eating snacks (the number of minor snack types and snack frequency), and on the fruit snacks there was a significant positive correlation between family income and the number of snack types, while on the beverage snacks there was a significant negative correlation between the amount of snack pocket money and the snack habit (number of snack types and frequency). The amount of snack pocket money and the number of major food snack types were positively and significantly related, and on beverage snacks there was also a positive and significant correlation between the amount of snack pocket money and the snack habit (number of snack types and frequency).
Keyword: 

Judul: Pengetahuan Gizi dan Keamanan Pangan serta Kebiasaan Jajan Anak di SD Negeri Sukadamai 03 Bogor dan SD Negeri Situgede 04 Bogor.
Abstrak: This study was aimed to examine the relationship between nutrition and food safety knowledge and snack habit among elementary school children in SDN Sukadamai 03 Bogor as represent high social economic status (SES) and SDN Situgede 04 Bogor represent low SES. This research was a cross-sectional study involving 283 students. Data collection using self administered quesstionnaire. The results show that children with low category of nutrition knowledge in high SES (19.9%) is lower than that in low SES (62.2%), while for food safety knowledge, no high SES children was found with low category whereas in low SES were 11.8%. Snack food commonly eaten by children in both SES were extrudat products. Number of kind snacks consumed by low SES children were higher (>7) than that of high SES (5-7). Nutritional status of most children in both SES were normal. Contribution of snack to energy and nutrients intake ranged from 8.6% (vitamin C) to 15% (energy) while the contribution to energy and nutrients adequacy were ranged from 7.2% (vitamnin C) to 16.1% (calcium). Correlation analysis showed significant relationship between nutrition knowledge, food safety knowledge and snack habits with amount of pocket money (p<0.05), nutritional status (p<0.05) and father and mother education (p<0.05).
Keyword: high SES, low SES, snack habit, food safety knowledge, nutrition knowledge

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.
Keyword: