Judul: Hubungan pengetahuan gizi dan status gizi dengan ketahanan fisik pada siswi SMA 9 Bogor
Abstrak: Pengetahuan gizi akan mempengaruhi mind set seseorang khususnya remaja putri yang memiliki kecenderungan untuk tampil cantik. Status gizi dari remaja putri sedikit banyak akan mempengaruhi daya tahan kardiorespirasi. Tujuan penelitian ini adalah untuk menganalisis hubungan pengetahuan gizi, status gizi dan kebiasaan berolahraga dengan daya tahan kardiorespirasi. Desain penelitian ini adalah cross sectional. Hasil menunjukan bahwa rata-rata umur contoh adalah 16 tahun dengan mayoritas status gizi adalah normal, besar keluarga sedang dan pendapatan rata-rata di atas 5 juta perbulan. Daya tahan kardiorespirasi sebagian besar adalah Poor dengan pengetahuan gizi mayoritas sedang. Sebaran aktifitas fisik contoh sebagian besar ringan dengan frekuensi olahraga 2 kali seminggu dengan durasi 2 jam. Terdapat hubungan pada daya tahan kardiorespirasi dengan status gizi (p=0,077 r= -0,472) dan frekuensi olahraga (p=0,012 r= 0,26). Terdapat hubungan yang signifikan antara frekuensi olahraga dengan physical activity level (p=0,006 r=0,29). Berdasarkan uji regresi linear sebagai uji lanjut diketahui hasil yang signifikan untuk status gizi (p=0,008) dan frekuensi olahraga (p=0,009) dengan daya tahan kardiorespirasi sebagai variable terikat., Nutrition knowledge would affected people’s mind set especially female teenage who had to be looked a like beauty. Female teenage body mass index (BMI) would affected cardiorespiratory endurance (CE). The objective of this study was analyzing the relationship between nutrition knowledge, body mass index and sport habit to cardiorespiratory endurance. The study design was cross sectional. Subject mostly 16 years old with normal BMI, counted of family member was intermediate and salary over 5 million a month. Subject mostly have CE Score was Poor and intermediate knowledge. Physycal activity subject sprout mostly light by frequency 2 hours a day and it was done 2 times a week. There were a correlation between CE with BMI (p=0,077 r= -0,472) and sports frequency (p=0,012 r= 0,26). There were a correlations between sport frequency with physical activity level (p=0,006 r=0,29). Depends of linear regression correlations test as further test known that there were a significant results for BMI (p=0,008) and sports frequency (p=0,009) with CE as dependent variable.
Keyword: daya tahan kardiorespirasi, pengetahuan gizi, status gizi

Judul: Hubungan Aktivitas Fisik, Pengetahuan, dan Tingkat Kecukupan Gizi Dengan Status Gizi Siswa SMP Boarding School
Abstrak: Remaja membutuhkan energi dan zat gizi untuk memenuhi kebutuhan masa pertumbuhan dan aktivitas fisik yang dipengaruhi oleh pengetahuan gizi. Penelitian ini bertujuan menganalisis hubungan aktivitas fisik, pengetahuan, dan tingkat kecukupan gizi dengan status gizi siswa SMP boarding school. Desain penelitian cross sectional study dengan 43 subjek di SMPIT Al Bunyan, Cikaret. Hasil tingkat aktivitas fisik subjek tergolong sangat ringan dan ringan. Pengetahuan gizi berkategori rendah sebanyak 60,5%. Tingkat kecukupan gizi (TKG) berupa energi berkategori cukup 32,6%, berlebih 20,9%, dan defisit 46,5%, protein berkategori cukup 14%, berlebih 9,3%, dan defisit 76,7%, lemak berkategori cukup 18,6%, berlebih 7%, dan defisit 74,4%, serta karbohidrat berkategori cukup 25,6%, berlebih 34,9%, dan defisit 39,5%. Subjek dengan status gizi kurang memiliki TKG yang lebih tinggi dibandingkan dengan status gizi obes. Subjek dengan status gizi obes ternyata mempunyai asupan zat gizi yang rendah pada saat food recall dilakukan. Uji statistik menunjukkan adanya hubungan yang signifikan antara tingkat kecukupan energi (p=0,001, r=-0,484), protein (p=0,000, r=-0,515), dan karbohidrat (p=0,000, r=-0,535) dengan status gizi. Tidak ada hubungan signifikan antara aktivitas fisik, pengetahuan gizi, dan tingkat kecukupan lemak dengan status gizi., Adolescents require energy and nutrients to meet the needs of growth and physical activity which are influenced by nutritional knowledge. This study aims to analyze the relationship between physical activity, knowledge, and the level of nutritional adequacy with the nutritional status of boarding school junior high school students. The research design was a cross sectional study with 43 subjects at Integrated Islamic Junior High School of Al Bunyan, Cikaret. Physical activity level of the subjects were classified very light and light. Nutritional knowledge was categorized low as 60.5%. The nutritional adequacy level (NAL) in the form of energy was categorized sufficient 32.6%, excess 20.9%, and deficit 46.5%, protein was categorized sufficient 14%, excess 9.3%, and deficit 76.7%, fat was categorized sufficient 18.6%, excess 7%, and deficit 74.4%, and carbohydrates was categorized sufficient 25.6%, excess 34.9%, and deficit 39.5%, respectively. The NAL of undernourished subjects were observed to be higher than NAL compared to obese subjects. Subjects with obesity were found to have low intakes nutrients at the time of food recall conducted. The result of this study showed significant correlation between the adequacy level of energy (p=0.001, r=-0.484), protein (p=0.000, r=-0.515), and carbohydrates (p=0.000, r=-0.535) with nutritional status. There was no significant correlation between physical activity, nutritional knowledge, and fat adequacy with nutritional status.
Keyword: aktivitas fisik, pengetahuan gizi, status gizi, tingkat kecukupan gizi, nutritional adequacy level, nutritional knowledge, nutritional status, physical activity

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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