Judul: Perubahan Pengetahuan, Sikap dan Perilaku Jajan Anak Sekolah Melalui Penyuluhan Gizi di SDN Pasanggrahan 2, Purwakarta.
Abstrak: Nutrition education is an effort for people to obtain knowledge about nutrition. The aim of this study was to examine changes in knowledge, attitude of nutrition and food safety snacks and snack practice of school children through nutrition education. The study used a cross-sectional study design. A total number of 53 elementary school children in underdeveloped villages were selected out of 224 children by purposively. Data collected through questionnaires and interviews 2x24 hour recall method. There was a significant difference between pretest and posttest knowledge, attitude of nutrition and food safety knowledge (p<0.05), however there was no difference exist between snacks practices pretest and posttest. Snack food contributed energy (13,0%), protein (45,3%), vitamin A (1,4%), vitamin C (15,0%), calcium (5,3%), phosphorus (3,1%) and iron (15,9%) respectively. Street food contributed to the adequacy level of energy (9,0%), protein (55,9%), vitamin A (4,1% ), vitamin C (3,6%), calcium (1,8%), phosphorus (2,1%) and iron (9,5%) respectively.
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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.
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