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: 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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