Judul: Correlation Between Stress Level, Sleep Quality, and Food Habits with Nutritional Status in IPB University Dormitory Students
Abstrak: Penelitian ini bertujuan mengetahui dan menganalisis hubungan tingkat stres, kualitas tidur, dan kebiasaan makan dengan status gizi pada mahasiswa asrama IPB. Desain penelitian ini merupakan studi cross sectional dengan jumlah subjek sebanyak 78 mahasiswa asrama IPB University. Penelitian dilakukan secara langsung pada bulan Mei 2024 melalui pengisian kuesioner dan wawancara. Instrumen pengukuran tingkat stres menggunakan kuesioner PSS-10, kualitas tidur menggunakan kuesioner Pittsburgh Sleep Quality Index (PSQI), kebiasaan makan menggunakan kuesioner Adolescent Food Habits Checklist (AFHC), status gizi diukur secara langsung pada berat badan dan tinggi badan. Sebagian besar subjek mengalami stres sedang (72%), kualitas tidur yang buruk (85%), dan kebiasaan makan yang tidak sehat (65%). Sebagian besar status gizi subjek tergolong normal (61%). Hasil analisis menunjukkan tidak terdapat hubungan signifikan antara tingkat stres, kualitas tidur, dan kebiasaan makan dengan status gizi (p>0,05)., This research aims to determine and analyze the correlation between stress level, sleep quality, and food habits with nutritional status in IPB University dormitory students. The design of this research was a cross-sectional study with 78 IPB University dormitory students as subjects. The research was conducted online in May 2024 by filling out questionnaires and interviews. Instruments for measuring stress levels using the PSS-10, sleep quality using the Pittsburgh Sleep Quality Index (PSQI) questionnaire, food habits using the Adolescent Food Habits Checklist (AFHC) questionnaire, nutritional status was measured directly on body weight and height. Most subjects experienced moderate stress (72%), poor sleep quality (85%), and unhealthy food habits (65%). Most of the subjects nutritional status was classified as normal (61%). The results of the analysis showed that there was no significant correlation between stress level, sleep quality, and food habits with nutritional status (p>0.05).
Keyword: nutritional status, sleep quality, food habits, stress level

Judul: Correlation between Stress Level, Physical Activity, Sleep Duration, Eating Habit, and Nutritional Status in Final Year Students
Abstrak: Masalah yang sering ditemui pada mahasiswa tingkat akhir adalah stres karena mengerjakan skripsi, sehingga memengaruhi pola makan, penurunan aktivitas fisik, dan durasi tidur yang pendek. Penelitian ini bertujuan menganalisis hubungan stres, aktivitas fisik, durasi tidur, dan pola makan terhadap status gizi pada mahasiswa IPB tingkat akhir. Penelitian dilakukan pada bulan Mei–Juni 2023 pada 55 mahasiswa dengan studi cross sectional. Hasil penelitian menunjukkan sejumlah 34,5% mahasiswa mengalami stres tingkat ringan, 58,2% aktivitas fisik ringan, 80% mahasiswa memiliki durasi tidur kurang, dan sebagian besar mahasiswa memiliki rata-rata tingkat kecukupan gizi defisit. Hasil analisis korelasi rank Pearson menunjukkan terdapat hubungan signifikan bersifat positif antara aktivitas fisik dengan status gizi, dan hubungan signifikan bersifat negatif antara tingkat kecukupan energi, tingkat kecukupan protein, tingkat kecukupan lemak, dan tingkat kecukupan karbohidrat dengan status gizi (p<0,05). Tidak terdapat hubungan signifikan antara tingkat stres dan durasi tidur dengan status gizi (p>0,05)., The problem that is often encountered in final year students is stress from working on thesis, which affects eating habit, decreased physical activity, and short sleep duration. This study aims to analyze the relationship between stress, physical activity, sleep duration, and eating habit on the nutritional status of final year IPB students. The research was conducted in May–June 2023 on 55 students with a cross sectional study. The results showed that 34,5% of students experienced mild levels of stress, 58,2% had light physical activity, 80% of students had less sleep duration, and most students had an average deficit nutritional adequacy level. The results of Pearson's rank correlation analysis showed that there was a significant positive relationship between physical activity and nutritional status, and a significant negative relationship between energy adequacy level, protein adequacy level, fat adequacy level, and carbohydrate adequacy level with nutritional status (p<0,05). There is no significant relationship between stress levels and sleep duration with nutritional status (p>0,05).
Keyword: food consumption, nutritional status, physical activity, sleep duration, 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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