Judul: Hubungan Pengetahuan Gizi dan Kesehatan Ibu serta Kebiasaan Makan dengan Perkembangan Kognitif Balita Stunting dan Normal
Abstrak: Prevalence of stunting in Indonesia is extremely high, which can result in impaired development i.e cognitive development. The objective of this study was to analyze the relationship of mother's nutrition and health knowledge as well as eating habits with cognitive development of stunting and normal underfive children. Samples were 82 underfive children selected purposively, consisted of 41 stunting underfive children and 41 normal underfive children. Most of stunting underfive children were female aged 3.6-4.5 years. Result showed mother's nutrition and health knowledge, eating habits and cognitive development of normal underfive children were better than stunting underfive children. Eating habits and cognitive development of stunting and normal underfive children had significant difference (p<0.05). Correlation test showed that diversity of vegetables had a positive correlation with cognitive development, but frequency and diversity of snack had negative correlation with cognitive development.
Keyword: stunting, cognitive development, eating habits, mother's nutrition and health knowledge

Judul: Praktek Pemberian Makan, Konsumsi Pangan, Stimulasi Psikososial dan Perkembangan Balita Stunting dan Normal
Abstrak: Stunting it’s a nutrition problem in Indonesia, prevalence of stunting in Indonesia is 35.6%. The impact of chronic under nutrition in children can decreased brain development that can result in low intelligence, learning ability in children. The purpose of this study was to identify feeding practices, food consumption and psychosocial stimulation and it’s relation to child development in stunting and normal under five children. Design used in this study was a crosssectional study. Subjects in this study were 92 children under the age of 36-60 months in the village Cibatok Dua. The result showed, there was significant differences in food consumption and language development between stunting and normal under five children (p<0.05). Correlation test result is significant positive relation between food consumption and nutritional status (HAZ), nutritional status (HAZ) and cognitive development, and nutritional status (HAZ) and language development (p<0.05).
Keyword: child development, food consumption, feeding practice, stunting

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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