Judul: Hubungan Gaya Hidup dan Pengetahuan Gizi terhadap Kebiasaan Makan Remaja di Pedesaan dan Perkotaan
Abstrak: The objective of this research was to study correlation between life styles and nutrition knowledge with eating habit of rural and urban adolescent. Research design was cross sectional study.Samples were selected from adolescent of Senior High School of 10th grader at SMA Negeri 109 Jakarta Selatan and SMK Giri Taruna Jasinga, Kabupaten Bogor. Sampling was done using Simple Random Sampling. The sample consisted of 110 students. The results that the higher the smoking habit the lower the habit of buying street or junk food, the higher internet usage the higher the water consumption, and the higher the nutrition knowledge the lower the eating frequency and the water consumption.
Keyword: eating habit, nutrition knowledge, internet usage, smoking habit, adolescent

Judul: Hubungan Pengetahuan, Sikap, dan Praktik Gizi dengan Keragaman Konsumsi Pangan Remaja di Kecamatan Ciampea, Bogor
Abstrak: Pengetahuan, sikap, dan praktik gizi merupakan faktor tercapainya keseimbangan zat gizi remaja. Penelitian ini bertujuan untuk menganalisis hubungan pengetahuan, sikap, dan praktik gizi dengan keragaman konsumsi pangan remaja di Kecamatan Ciampea, Bogor. Penelitian berdesain cross-sectional ini menggunakan data sekunder penelitian lain yang dilakukan pada bulan Oktober 2017 – Febuari 2018 terhadap 262 siswi SMP dan SMK. Variabel yang diteliti meliputi karakteristik remaja, pengetahuan gizi, sikap gizi, praktik gizi, asupan zat gizi, status gizi, dan keragaman konsumsi pangan remaja. Hasil penellitian ini menunjukkan bahwa sebagian besar remaja putri memiliki pengetahuan gizi sedang, sikap gizi baik, dan praktik gizi sedang. Rata-rata skor keragaman konsumsi pangan (IDDS) remaja putri tergolong tinggi (≥6 jenis kelompok pangan). Terdapat hubungan positif signifikan antara usia dan uang saku remaja putri dengan pengetahuan dan sikap gizi (p<0,05). Karakteristik remaja putri memiliki hubungan positif signifikan dengan keragaman konsumsi pangan (p<0,05). Pendidikan gizi mendorong alokasi uang saku yang sesuai dengan prinsip gizi seimbang penting untuk dilakukan., Nutritional knowledge, attitude, and practice are important factors for balanced nutrition for adolescents. This research aimed to analyze relationship between nutritional knowledge, attitude, practice, and dietary diversity of adolescents in Ciampea district, Bogor. This cross-sectional study used secondary data of a study conducted in October 2017 – February 2018 to 262 junior and vocational high school students. Variables included were individual characteristics, nutritional knowledge, attitude, and practice, nutrient intake, nutritional status, and dietary diversity. Results showed that majority of adolescent girls had fair nutritional knowledge, good nutritional attitude, and fair nutritional practice. Average individual dietary diversity score (IDDS) of adolescents was high (≥6 food groups). There were positive significant associations (p<0.05) on age and school allowance with nutritional knowledge and attitude. These individual characteristics were also associated with dietary diversity of adolescents (p<0.05). Nutrition education encouraging proper allocation of school allowance in line with balanced nutrition guidelines is important.
Keyword: adolescent girls, dietary diversity, nutritional attitude, nutritional knowledge, nutritional practice, adolescent girls, dietary diversity, nutritional attitude, nutritional knowledge, nutritional practice

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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