Judul: The Correlation between Stress Score, Eating Habit and Nutritional Status of Final Year Sudents
Abstrak: Mahasiswa tingkat akhir sering mengalami stres karena mengerjakan skripsi, sehingga dapat memengaruhi pola makan dan status gizi. Penelitian ini bertujuan menganalisis hubungan nilai skor stres, pola makan dan status gizi pada mahasiswa tingkat akhir. Desain penelitian menggunakan studi cross sectional melibatkan 30 subjek. Penelitian dilakukan November 2019 hingga Maret 2020 di Fakultas Ekologi Manusia IPB. Data yang dikumpulkan adalah karakteristik individu dan keluarga, nilai skor stres, pola makan, dan status gizi. Data nilai skor stres dikumpulkan menggunakan kuesioner Depression Anxiety Stress Scales 42 (DASS 42), sedangkan data pola makan dikumpulkan menggunakan Food Frequency Questionnaire (FFQ) dan recall 2 x 24 jam. Hasil penelitian menunjukkan pola makan sebagian besar subjek belum sesuai panduan gizi seimbang. Sebagian besar subjek memiliki rata-rata tingkat kecukupan gizi defisit, 83,3% subjek berstatus gizi normal dan 63,3% subjek memiliki nilai skor stress terkategori stres sedang. Terdapat hubungan signifikan negatif antara nilai skor stres dengan asupan energi (p<0,05), artinya semakin tinggi nilai skor stres mahasiswa, asupan energi subjek semakin rendah. Tidak terdapat hubungan pola makan dengan status gizi (p<0,05), demikian pula tidak terdapat hubungan antara nilai skor stres dengan status gizi (p>0,05)., Final-year students often experience stress because they work on their thesis, which may affect their eating habits and nutritional status. This study analyzes the relationship between stress scores, eating habits, and final year students' nutritional status. The study used a cross-sectional study design involving 30 subjects. The research was conducted from November 2019 to March 2020 at the Faculty of Human Ecology, IPB. The data collected were individual and family characteristics, stress scores, eating habits, and nutritional status. Stress score data were collected using the Depression Anxiety Stress Scales 42 (DASS 42) questionnaire while eating habit data were collected using the Food Frequency Questionnaire (FFQ) and 2 x 24-hour recall. The results showed that the diet of most of the subjects did not comply with balanced nutrition guidelines. Most of the subjects had an average nutritional adequacy deficit, 83.3% of subjects with normal nutritional status, and 63.3% had stress score categorized as moderate stress levels. There is a significant negative relationship between the stress score and energy intake (p <0.05), meaning that the higher the students stress score the lower the energy intake. There is no relationship between eating habits and nutritional status (p<0.05), as well as no relationship between stress scores and nutritional status (P>0.05).
Keyword: final year students, eating habit, nutritional status, stress score

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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