Judul: Hubungan antara Asupan Vitamin dan Mineral dengan Morbiditas pada Siswa di SMPN 5 Bogor dan SMPN 2 Cibinong
Abstrak: The aim of this study was to study the correlation between intake of vitamin and mineral and morbidity of Junior High School students. The study using cross-sectional study design. It was conducted on November 2011. Total sample were 102 student from 8th grade of SMPN 5 Bogor and SMPN 2 Cibinong. The result showed that there were a significant negative correlation between the level of energy, protein and zinc sufficiency and nutritional status. While the test result of vitamin A and C sufficiency level and nutritional status showed that there were no correlation between them. The result of Pearson correlation test showed that there were no correlation between the of level energy, protein, vitamin A, Vitamin C, zinc, nutritional status, and morbidity.
Keyword: 

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: 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: