Judul: Asupan Gizi, Status Gizi, Kebugaran Fisik, dan Prestasi Belajar Siswa SMP Negeri 1 Jati dan SMP Negeri 2 Undaan Kudus
Abstrak: This study aims to analyze the nutrient intake, nutritional status, physical fitness, and academic achievement of SMP N 1 Jati and SMP N 2 Undaan Kudus students. The design used a cross sectional study, sample of this study was 73 students of SMP N 1 Jati and 72 students of SMP N 2 Undaan. There wasn’t a correlation between pocket money with energy and nutrient adequacy in urban and rural, except protein adequacy (rs=0.231;p=0.049) in urban. There wasn’t a correlation between parental education and parental income with energy and nutrient adequacy in urban and rural, except parental education and vitamin C adequacy (rs=0.253,0.243; p=0.032,0.040) in rural, parental income and vitamin C adequacy (rs=−0.241;p=0.041) in rural. There was a correlation between nutritional status and academic achievement in urban (rs= 0.383;p=0.001), and there was a correlation between learning activities and academic achievement in rural (rs=0.612;p=0.000).
Keyword: Bogor Agricultural University (IPB), adolescents, academic achievement, physical fitness, nutritional status, nutrient intake

Judul: Hubungan Status Gizi (TB/U) dengan Status Kesehatan dan Prestasi Akademik Anak Usia Sekolah
Abstrak: The aims of this study was to determine the association between nutritional status (H/A) and health status and also between nutritional status (H/A) and academic achievement of student in 4th, 5th, and 6th grade in Sukamakmur Village, Bogor district. The design was a cross sectional study with 76 subjects, consisting of 38 normal subjects and 38 stunting subjects. The result showed that average subject’s height; subject’s nutritional status (H/A); mother’s height; family income; nutritional adequacy level (energy and nutrients); and health status (frequency and period of illness) in stunting subjects were significantly lower than normal subjects (p < 0.1). There was a significant correlation between mother’s education and nutritional adequacy level (energy and protein); family income and nutritional adequacy level (energy, protein, iron, vitamin A, vitamin C, and zinc); household size and nutritional adequacy level (energy, protein, vitamin A, vitamin C, and zinc); mother’s height and nutritional status (H/A) and also nutritional adequacy level (energy and nutrients) and nutritional status (H/A); and also nutritional status (H/A) and health status (frequency and period of illness). viii Therefore, subjects with higher nutritional status (H/A) tend to have better health status (lower frequency and period of illness).
Keyword: Bogor Agricultural University, schoolage children., nutritional status, health status, academic achievement

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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