Judul: The Relationship between Fruit Vegetable Consumption Habits and Physical Activity with Nutritional Status and Physical Fitness of Students at SDN 1 Cijeungjing
Abstrak: Status gizi kurang dan lebih merupakan salah satu masalah gizi yang banyak dihadapi pada usia anak sekolah dasar. Status gizi dapat dipengaruhi oleh berbagai faktor seperti pengetahuan gizi, aktivitas fisik, kebugaran, dan kebiasaan makan. Tujuan penelitian ini adalah menganalisis hubungan kebiasaan konsumsi sayur dan buah serta aktivitas fisik dengan status gizi dan kebugaran jasmani siswa di SDN 1 Cijeungjing. Penelitian ini dilaksanakan pada bulan Oktober-November 2022 pada 58 subjek dengan desain cross sectional study. Pengambilan data dilakukan melalui pengukuran tinggi badan dan berat badan, wawancara, harvard step test, pengisian kuesioner meliputi karakteristik subjek dan keluarga, PAQ-C (Physical Activity Questionnaire for Children), dan FFQ (Food Frequency Questionnaire). Sebagian besar subjek berjenis kelamin laki-laki (72,4%) dengan status gizi normal (79,3%). Hasil analisis menunjukkan terdapat hubungan yang signifikan (p<0,05) antara kebiasaan konsumsi sayur dan buah dengan aktivitas fisik (p-value=0,050;r=-0,129). Terdapat hubungan yang signifikan (p<0,05) antara aktivitas fisik dengan kebugaran jasmani (p-value=0,029;r=0,288). Namun, tidak terdapat hubungan yang signifikan (p>0,05) antara kebiasaan konsumsi sayur dan buah dengan status gizi (p-value=0,338;r=0,128). Tidak terdapat hubungan yang signifikan (p>0,05) antara aktivitas fisik dengan status gizi (p-value=0,142;r=0,195). Tidak terdapat hubungan yang signifikan (p>0,05) antara kebiasaan konsumsi sayur dan buah dengan kebugaran jasmani (p-value=0,333;r=-0,129)., Underweight and overweight are one of the most common nutritional problems faced by elementary school children. Nutritional status can be influenced by various factors such as nutritional knowledge, physical activity, fitness, and eating habits. The aim of this study was to analyze the relationship between fruit vegetable consumption habits and physical activity with the nutritional status and physical fitness of students at SDN 1 Cijeungjing. This study was conducted in October-November 2022 on 58 subjects with a cross-sectional study design. Data collected by measuring height and weight, interviews, harvard step test, filling out questionnaires including subject and family characteristics, PAQ-C questionnaire (Physical Activity Questionnaire for Children), and FFQ questionnaire (Food Frequency Questionnaire). Most subjects were male (72.4%) with normal nutritional status (79.3%). The results of the analysis showed that there was a significant correlation (p<0.05) between fruit vegetables consumption habits with physical activity (p-value=0.050;r=-0.129). There was significant correlation (p<0.05) between physical activity with physical fitness (p-value=0.029;r=0.288). However, there was no significant correlation (p>;0.05) between fruit vegetables consumption habits with nutritional status (p-value=0.338;r=0.128). There was no significant correlation (p>0.05) between physical activity with nutritional status (p-value=0.142;r=0.195). There was no significant correlation (p>0.05) between fruit vegetables consumption habits with physical fitness (p-value=0.333;r=-0.129).
Keyword: fruit vegetables consumption habits, nutritional status, physical  activity, physical fitness

Judul: The Correlation between Nutritional Knowledge, Eating Habits, and Physical Activity with Nutritional Status among Student of SMAN 1 Kebumen
Abstrak: Prevalensi remaja gemuk usia 16-18 tahun di Indonesia meningkat pada tahun 2018. Kegemukan pada remaja dapat menimbulkan dampak negatif terkait aspek kesehatan dan psikososial. Penelitian ini bertujuan menganalisis hubungan pengetahuan gizi dengan kebiasaan makan, hubungan kebiasaan makan dengan status gizi, dan hubungan aktivitas fisik dengan status gizi siswa SMAN 1 Kebumen. Penelitian dilakukan pada Mei 2023 menggunakan desain cross sectional, melibatkan 30 remaja normal dan 30 remaja gemuk yang dipilih secara purposive. Data primer diperoleh melalui pengisian kuesioner dan wawancara berupa data karakteristik individu, karakteristik keluarga, pengetahuan gizi, aktivitas fisik, dan kebiasaan makan. Hasil uji beda menunjukkan tidak terdapat perbedaan signifikan (p>0,05) pengetahuan gizi, aktivitas fisik dan duduk, tingkat kecukupan energi dan zat gizi, asupan gula, serta kebiasaan pangan sumber gula dan lemak antara kedua kelompok subjek, namun kelompok subjek gemuk signifikan lebih banyak asupan lemaknya (p<0,05). Hasil uji korelasi menunjukkan hubungan signifikan positif antara asupan lemak dengan status gizi (p=0,01). Tidak terdapat hubungan signifikan pengetahuan gizi dengan kebiasaan pangan sumber gula dan lemak, asupan gula dan lemak, serta tingkat kecukupan energi dan zat gizi. Tidak terdapat perbedaan signifikan kebiasaan pangan sumber gula dan lemak, asupan gula, tingkat kecukupan energi dan zat gizi, dan aktivitas fisik dengan status gizi (p>0,05)., Prevalence obese adolescents aged 16-18 years in Indonesia increased in 2018. Obesity in adolescents have negative impacts related to health and psychosocial. This study aims to analyze correlation nutritional knowledge and eating habits, correlation eating habits and nutritional status, and correlation physical activity and nutritional status students at SMAN 1 Kebumen. Study was conducted in May 2023 using a cross-sectional design, involving 30 normal and 30 obese adolescents that selected purposively. Primary data was obtained through questionnaires and interviews with individual characteristics, family characteristics, nutritional knowledge, physical activity, and eating habits. There was no significant difference (p>0.05) nutritional knowledge, physical activity and duration of sitting, energy and nutrients adequacy level, sugar intake, and eating habits of food sources sugar and fat between two subject, but obese subjects had significantly higher fat intake (p<0.05). There was a significant positive correlation fat intake and nutritional status (p=0.01). There was no significant correlation nutritional knowledge with eating habits of food sources sugar and fat, intake sugar and fat, also energy and nutrients adequacy level (p>0.05). There was no significant correlation eating habits of food sources sugar and fat, sugar intake, energy and nutrients adequacy level, and physical activity with nutritional status (p >0.05).
Keyword: eating habits, nutritional knowledge, nutritional status, normal and obes adolescents, 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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