Judul: Pengetahuan dan Sikap Gizi Ibu dengan Praktek Konsumsi Susu Anak Sekolah TK
Abstrak: Thisstudy is aimed to analyze correlation between mother’s nutritional knowledge and attitude and milk consumption of pre-school children’s (PSC). A cross sectional study design was applied among 136 PSC aged 4-5 yrs old in the two favorite kindergartens of Bogor City - Aliya and Mexindo. The mothers f the PSC filled in a questionnaire consist of sociodemographic characteristics, children’s milk consumption, and a nutritional knowledge-and-attitude. Milk consumsption of PSC was measured by applying a 30 days semi-FFQ method . The results show that most of mother had good nutritional knowledge and attitiude. More than 90% of them agree that drinking milk is a good habit for children. The mother’s nutritional attitudes showed significant positive correlation with children’s milk drinking habit (r = 0.31). No relation was found between nutritional knowledge with attitude and milk consumption
Keyword: pre-school children., milk consumption, nutritional attitude, nutritional knowledge

Judul: Hubungan Konsumsi Susu dengan Tinggi Badan Anak Sekolah TK
Abstrak: The objective of this study was to analyze the correlation between milk consumption and body height of pre-school children (PSC). The study was conducted by applying a cross sectional study design implemented among 136 PSC aged 4-5 yrs old in the two favorite kindergartens of Bogor City - Aliya and Mexindo. Milk intake was derived from the intake data collected by applying a 30 days semi-FFQ method filled in by the mothers. The body height of PSC is direcly measured by the researchers. The statistical analysis showed that there are positive significant correlation between body height and milk intake frequency, amount of milk intake, animal protein intake, total protein intake, and calcium intake from milk respectively (p<0.05), but there is no correlation between body height and calcium intake from non-milk (p>0.05). Children who consumed milk every day are taller than children who are not consumed (p<0.05).
Keyword: preschool children., body heigh, milk intake, milk calcium intake

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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