Judul: Correlations Between Consumption Patterns, Breakfast Habits, and Snacking Habits With Nutritional Status of Adolescents at Senior  High School Kornita IPB
Abstrak: Pola konsumsi yang tidak sehat menyebabkan dampak negatif bagi kesehatan. Salah satu upaya untuk meningkatkan kesehatan dapat dimulai dengan membiasakan sarapan. Melewatkan sarapan dapat membuat rasa lapar sehingga memicu membeli jajanan yang berkalori tinggi. Oleh karena itu penelitian ini bertujuan untuk menganalisis hubungan pola konsumsi, kebiasaan sarapan, dan kebiasaan jajan dengan status gizi remaja di SMA Kornita IPB. Desain penelitian ini adalah cross sectional study dengan subyek berjumlah 69 orang dipilih secara purposive sampling. Pengumpulan data dilakukan melalui google form, wawancara melalui telepon, serta pengukuran tinggi badan dan berat badan secara langsung. Hasil penelitian menunjukkan sebagian besar (55,1%) pola konsumsi subjek tergolong kurang baik, sebagian besar subjek (56,5%) selalu melakukan sarapan dan (55,1%) subjek memiliki frekuensi jajan kadang-kadang. Berdasarkan hasil uji korelasi menunjukkan adanya hubungan yang signifikan antara kebiasaan konsumsi pangan jenis buah-buahan (p=0,0023; r=0,273), kebiasaan konsumsi pangan jenis susu dan olahannya (p=0,049; r=0,238), tingkat kecukupan protein (p=0,025; r=-0,270), tingkat kecukupan karbohidrat (p=0,005; r=-0,234), kualitas konsumsi pangan (p=0,017; r=0,287), kontribusi sarapan (p=0,002; r=-0,374) dengan status gizi subjek. Tidak ada hubungan yang signifikan antara kebiasaan sarapan dan kebiasaan jajan dengan status gizi. Selain itu tidak ada hubungan yang signifikan antara kebiasaan sarapan dengan kebiasaan jajan. Kata kunci : kebiasaan jajan, kebiasaan sarapan, pola konsumsi, status gizi, Unhealthy consumption patterns cause negative impact on health. Get used to breakfast can improve health. Skipping breakfast can triggers to buy high calorie snacks. This research aimed to analyze correlations between consumption patterns, breakfast habits, and snacking habits with nutritional status of adolescents in senior high school Kornita IPB. The design of this research is a cross sectional study with 69 subjects selected by purposive sampling. Data was collected through google forms, online interviews, and measurements of height and weight. The results showed that most of the subjects' consumption patterns (55.1%) were classified as poor, most of the subjects (56.5%) always had breakfast, and (55.1%) the subjects has a snacking rarely. Based on the results of this study, there was a significant correlation between consumption habits of fruit (p = 0.0023, r = 0.273), consumption habits of milk (p = 0.049, r = 0.238), protein adequacy level (p=0.025, r=-0.270), carbohydrate adequacy level (p=0.005, r=- 0.234), quality of food consumption (p=0.017, r=0.287), breakfast contribution (p=0.002, r=-0.374) with nutritional status. There is no significant correlation between breakfast habits, and snacking habits with nutritional status. In addition, there is no significant correlation between breakfast habits and snacking habits. Keywords: breakfast habits, consumption patterns, nutritional status, snack habits
Keyword: breakfast habits, consumption patterns, nutritional status, snack habits

Judul: Correlation Between Body Image, Breakfast and Snacking Habit with Nutritional Status of Female Adolescents
Abstrak: Rasa tidak puas pada bentuk tubuh bagi remaja seringkali berdampak pada kebiasaan makan sehingga menunda dan/atau melewatkan waktu makan. Oleh karena itu penelitian ini bertujuan untuk menganalisis hubungan antara body image, kebiasaan sarapan, dan jajan dengan status gizi remaja putri SMA Negeri 33 Jakarta. Desain penelitian ini adalah cross sectional study dengan subyek berjumlah 62 orang dipilih secara purposive sampling, terdiri dari 31 subyek dengan status gizi lebih dan 31 subyek dengan status gizi normal. Pengumpulan data dilakukan melalui google form dan wawancara melalui telepon. Hasil penelitian menunjukkan bahwa subyek berstatus gizi lebih yang memiliki body image negatif (93,5%) adalah signifikan (p<0,05) lebih banyak daripada yang berstatus gizi normal (77,4%). Kebiasaan atau frekuensi sarapan dan jajan subyek berstatus gizi lebih masing-masing tidak berbeda signifikan (p>0,05) dengan yang berstatus gizi normal. Berdasarkan hasil uji korelasi menunjukkan bahwa terdapat hubungan signifikan positif (p=0,001, r=0,410) antara body image dengan status gizi subyek. Hal ini berarti bahwa semakin tinggi nilai z-score IMT/U (overweight) subyek maka persepsi terhadap body image semakin negatif. Namun demikian tidak terdapat hubungan signifikan (p>0,05) antara body image dengan kebiasaan sarapan dan jajan., Dissatisfaction with body image for adolescents often has an impact on eating habits that are different from usual, causing them to delay and/or skip meals. This research aimed to analyze the correlation between body image, breakfast and snacking habits with nutritional status of female adolescents at SMA Negeri 33 Jakarta. A cross sectional study design with 62 subjects selected purposively sampling, consisting of 31 subjects with overweight nutritional status and 31 subjects with normal nutritional status. Google forms and phone interviews were used to obtain the data. The results showed that overweight subject with a negative body image (93,5%) were significantly higher (p<0,05) than those with a normal nutritional status (77,4%). Breakfast and snacking habits, estimated by its frequencies, of overweight and normal nutritional status of subject were not significantly (p>0.05) different. Based on the correlation test, there was a significant positive correlation (p= 0,001, r= 0,410) between body image and the nutritional status of the subjects. This indicated that the higher the z-score BMI/A (overweight) subject, the more negative the perception of body image. Meanwhile, there were not significant correlation (p>0.05) between body image with breakfast and snacking habits.
Keyword: ody image, breakfast habits, nutritional status, snacking habits

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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