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 Breakfast and Snacking Habits of Adolescents in Cirebon City
Abstrak: Penelitian bertujuan menganalisis hubungan kebiasaan sarapan dan jajan dengan status gizi remaja di Kota Cirebon. Penelitian comparative cross-sectional study ini melibatkan 92 subjek (46 subjek gemuk dan 46 subjek berstatus gizi normal). Data karakteristik subjek dan keluarga, kebiasaan sarapan, dan kebiasaan jajan diperoleh melalui wawancara menggunakan kuesioner. Data antropometri diperoleh dengan pengukuran secara langsung. Hasil penelitian menunjukkan tingkat pendidikan orang tua signifikan lebih tinggi dan kontribusi energi sarapan signifikan (p<0,05) lebih rendah pada subjek gemuk dibandingkan dengan subjek status gizi normal. Mayoritas subjek gemuk (43,5%) jarang mengonsumsi sarapan sedangkan mayoritas subjek status gizi normal (37,0%) selalu mengonsumsi sarapan. Kontribusi sarapan sebagian besar subjek gemuk (52,2%) adalah kurang sedangkan pada subjek normal (54,3%) adalah sedang. Frekuensi jajan subjek gemuk (60,9%) dan normal (52,2%) memiliki frekuensi jajan sering (>2 kali/minggu) sedangkan kontribusi energi jajanan tinggi untuk subjek gemuk dan sedang untuk subjek berstatus gizi normal. Tidak terdapat hubungan signifikan (p>0,05) antara karakteristik keluarga dengan kebiasaan jajan, kebiasaan sarapan dengan kebiasaan jajan, kebiasaan jajan dengan status gizi, dan frekuensi sarapan dengan status gizi, tetapi terdapat hubungan signifikan positif (p=0,01; r=0,22) antara kontribusi energi sarapan dengan status gizi. Hasil ini mengindikasikan semakin tinggi kontribusi energi sarapan, maka semakin normal status gizi subjek., This research aimed to analyze correlation between breakfast and snacking habits with nutritional status of adolescents in Cirebon City. This comparative cross-sectional study involved 92 subjects (46 subjects of each overweight/obese (OWO) and normal nutritional status). Characteristics of subject and their family, breakfast and snacking habits data were obtained through interviewed, anthropometric data were obtained from direct measurements. The results showed that parental education level was significant higher and breakfast energy contribution was significant lower (p<0.05) of OWO subject than normal. Most of OWO subjects rarely consume breakfast while most of normal subjects always consume breakfast. The breakfast energy contribution of most OWO and normal subjects was categorized as low and moderate, respectively. The frequency of snacking of both subjects was mostly frequent (>2 times / week) while snack energy contribution of OWO and normal subjects were high and moderate, respectively. There was no significant relationship (p>0.05) between family characteristics and snacking habits, breakfast and snacking habits, snacking habits and nutritional status, and breakfast frequency and nutritional status, but there was positive significant relationship (p=0.01; r=0.22) between breakfast energy contribution and nutritional status. These indicated that higher the breakfast energy contribution, the more normal the nutritional status of the subjects.
Keyword: snacking habit, breakfast habit, adolescents, nutritional status

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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