Judul: The Correlation between Eating Habit, Nutrients Intake and Adequacy, Sleep Quality with Academic Achievement of Nutrition and Economics Students in IPB
Abstrak: Prestasi akademik adalah derajat keberhasilan sebagai bentuk pencapaian belajar setelah mengikuti proses belajar. Penelitian ini bertujuan menganalisis hubungan kebiasaan makan, asupan zat gizi, serta kualitas tidur dengan prestasi akademik pada mahasiswa Gizi dan Ilmu Ekonomi IPB. Desain penelitian menggunakan cross sectional dengan melibatkan 31 mahasiswa Gizi dan 30 mahasiswa Ilmu Ekonomi. Data pengetahuan gizi dikumpulkan menggunakan kuesioner yang diisi sendiri oleh subjek. Data kebiasaan makan dikumpulkan dengan food frequency questionnaires, sedangkan data asupan makanan menggunakan metode recall 2x24 jam. Data kualitas tidur dikumpulkan dengan kuesioner pittsburgh sleep quality index, data konsentrasi belajar menggunakan kuesioner digit symbol sutitution test, sedangkan data prestasi akademik didapatkan dari indeks prestasi kumulatif. Hasil penelitian menunjukkan asupan zat gizi subjek secara keseluruhan kurang dan kebiasaan makannya tidak jauh berbeda. Pengetahuan gizi mahasiswa Gizi lebih baik dibandingkan mahasiswa Ilmu Ekonomi dan terdapat perbedaan nyata (p<0,05). Mayoritas kualitas tidur subjek tergolong buruk. Konsentrasi belajar mahasiswa Gizi (72,5±7,3) lebih baik dibandingkan mahasiswa Ilmu Ekonomi (63,2±11,1) dengan perbedaan nyata (p<0,05). Prestasi akademik sebagian besar subjek tergolong baik. Terdapat korelasi yang signifikan positif antara asupan protein dan lemak dengan konsentrasi belajar serta hubungan konsentrasi belajar dengan prestasi akademik (p<0,05)., Academic achievement is degree of success as a form of learning achievement after following learning process. This research aim to analyze the correlation between eating habit, nutrients intake and sleep quality with academic achievement of nutrition and economics students in IPB. This cross sectional study involving 31 nutrition students and 30 economics students. Nutritional knowledge data was collected using a questionnaire that was filled out by the subjects themselves. Eating habit collected by food frequency questionnaires, while food intake data was collected using 2x24 hour recall. Sleep quality collected by pittsburgh sleep quality index, learning concentration collected by digit symbol substitution test, while academic achievement data was collected by grade point average. The results showed, nutrients intake from most of subject was insufficient and their eating habits were not much different. Nutritional knowledge of nutrition students was better than economics students with significant difference (p<0,05). Majority of subjects’s sleep quality classified as poor. Learning concentration of nutrition students (72,5±7,3) was better than economics students (63,2±11,1) with significant difference (p<0,05). Academic achievement of most subjects is classified as good. There is significant positive correlation between protein and fat intake with learning concentration, and correlation between concentration ability with academic achievement (p<0,05).
Keyword: academic achievement, eating habit, sleep quality

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: 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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