Judul: Correlation between Stress Level, Eating Behavior Type, Nutrition Intake, and Nutritional Status in Students of SMAN 1 Kalianda
Abstrak: Pelajar cenderung mengembangkan kebiasaan makan yang buruk ketika berada dalam situasi yang memicu kondisi stres. Konsumsi makanan yang tidak sehat dapat menyebabkan remaja mengalami masalah gizi. Penelitian bertujuan menganalisis hubungan tingkat stres, tipe perilaku makan, asupan zat gizi, dan status gizi pada siswa di SMAN 1 Kalianda. Penelitian dilakukan pada bulan Agustus-September 2022 pada 92 subjek dengan studi cross sectional. Hasil penelitian menunjukkan faktor yang paling memicu kondisi stres pada subjek berkaitan dengan beban kerja dalam belajar. Sejumlah 44,6% subjek memiliki kecenderungan untuk menjadi emotional eaters. Hasil analisis korelasi rank Spearman menunjukkan terdapat hubungan signifikan antara tingkat stres, tingkat kecukupan energi, tingkat kecukupan protein, dan tingkat kecukupan karbohidrat dengan status gizi (p>0,05). Tidak terdapat hubungan signifikan antara tipe perilaku makan dan tingkat kecukupan lemak dengan status gizi (p>0,05).
Keyword: emotional eating, konsumsi makanan, status gizi, tingkat stres

Judul: The Interrelation between Stress Level, Quality of Diet, Nutritional Status, and Academic Achievement of Students, The Interrelation between Stress Level, Quality of Diet, Nutritional Status, and Academic Achievement of Students
Abstrak: Konsumsi pangan yang beragam dan bergizi merupakan hal yang penting bagi status gizi normal serta fungsi otak agar dapat memiliki prestasi belajar yang baik. Penelitian ini bertujuan menganalisis keterkaitan tingkat stres, kualitas diet, status gizi, dan prestasi belajar SMA. Penelitian cross-sectional ini melibatkan 82 subjek yang dipilih secara purposive. Pengumpulan data tingkat stres dilakukan melalui pengisian kuesioner oleh subjek, kualitas diet diestimasi menggunakan Indonesian Healthy Eating Index (I-HEI), berat badan dan tinggi badan diukur secara langsung untuk mengestimasi status gizi. Sebagian besar subjek memiliki tingkat stres tinggi (62,2%), kualitas diet dengan kategori membutuhkan perbaikan atau need improvement (58,6%), dan status gizi normal (62,2%). Tidak terdapat hubungan signifikan (p>0,05) antara tingkat stres dengan kualitas diet (p=0,320, r=-0,111) dan prestasi belajar (p=0,236, r=0,039); antara kualitas diet dengan status gizi (p=0,618, r=0,056); serta antara status gizi dengan prestasi belajar (p=0,180, r=0,150). Namun demikian, seluruh subjek yang gemuk (overweight dan obes) memiliki kualitas diet yang tidak baik (buruk dan membutuhkan perbaikan). Subjek dengan prestasi belajar baik cenderung memiliki status gizi baik (60,9%) dan tingkat stres tinggi (56,5%). Hal ini mengindikasikan bahwa subjek dengan status gizi baik lebih berpeluang memiliki prestasi belajar yang baik pula., The consumption of varies and nutritious foods is important for normal nutritional status and brain function to improve academic achievement. This study aimed to analyze the correlation between stress levels, the quality of diet, nutritional status, and high school academic achievement. This cross-sectional study involved 82 subjects selected by purposively. Stress level data was collected through filling out questionnaires by subjects, diet quality was estimated by Indonesian Healthy Eating Index (I-HEI), body weight and height were measured directly to estimate nutritional status. Most subjects had high level of stress (62,2%), diet quality with the category need improvement (58,6%), and normal nutritional status (62,2%). There was no significant correlation (p>0,05) between stress levels with diet quality (p=0,320, r=-0,111) and academic achievement (p=0,236, r=0,039); between diet quality with nutritional status (p=0,618, r=0,056); between nutritional status with academic achievement (p=0,180, r=0,150). However, all subjects who were overweight and obese had either poor or need improvement their diet quality. Subjects with good academic achievements tended to have a good nutritional status (60,9%) and high stress levels (56,5%). This indicated that subjects with good nutritional status were more likely to have a good academic achievement as well.
Keyword: Academic Achievement, Diet Quality, Nutritional Status, Stress Level

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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