Judul: Hubungan Status gizi, Penggunaan Instagram, Pola konsumsi, dan Risiko Gangguan Makan dengan Persepsi Tubuh pada Siswi SMAN 5 Bogor.
Abstrak: Penelitian ini bertujuan untuk menganalisis hubungan status gizi, penggunaan Instagram, pola konsumsi, dan gangguan makan dengan persepsi tubuh pada siswi SMAN 5 Bogor. Desain penelitian ini adalah studi cross-sectional dan melibatkan 95 orang siswi sebagai subjek penelitian. Hasil penelitian menunjukkan bahwa subjek dengan status gizi lebih (32.1%) lebih besar dibandingkan subjek dengan status gizi kurang (4.2%). 1/3 dari subjek penelitian memiliki persepsi tubuh negatif (37.9%) dan 14.7% subjek memiliki risiko gangguan makan. Subjek yang berisiko gangguan makan cenderung berada pada subskala dieting (12.6%). Durasi waktu penggunaan Instagram subjek sebagian besar termasuk dalam kategori light users (53.7%) dan persepsi penggunaan Instagram berpengaruh pada subjek (53.7%). Pola konsumsi subjek terkait pangan nabati, buah-buahan, dan sayuran tergolong rendah, sedangkan pola konsumsi jajanan tergolong sering. Terdapat hubungan negatif signifikan antara penggunaan Instagram dengan persepsi tubuh (p=0.031, r=-0.192). Tidak terdapat hubungan yang signifikan antara status gizi, pola konsumsi, dan gangguan makan dengan persepsi tubuh.
Keyword: gangguan makan, Instagram, persepsi tubuh, remaja, status gizi

Judul: Correlation Between Eating Behavior and Body Image with Nutritional Status among High School Students in Bogor
Abstrak: Dewasa ini remaja mulai memerhatikan perubahan fisik yang terjadi pada mereka dan tak jarang merasa tidak puas dengan bentuk tubuh yang dimiliki. Hal tersebut dapat mendorong remaja untuk melakukan upaya-upaya tertentu untuk membuat bentuk tubuh sesuai keinginannya, seperti membatasi asupan makan dan melakukan diet berlebih yang dapat memengaruhi perilaku makan, persepsi diri terhadap citra tubuh, dan status gizi. Penelitian ini bertujuan untuk menganalisis hubungan antara perilaku makan dan body image dengan status gizi siswa SMA di Kota Bogor. Desain penelitian ini adalah cross-sectional study. Jumlah sampel yang digunakan sebanyak 114 siswa SMA di Kota Bogor. Pengumpulan data dilakukan melalui wawancara dan self-administered secara online. Sebagian besar subjek memiliki status gizi normal (81,6%), tergolong dalam tipe perilaku makan external eating (75,4%), memiliki persepsi body image negatif (51,8%), dan memiliki kebiasaan makan yang kurang baik (53,5%). Terdapat hubungan signifikan antara status gizi siswa SMA dengan perilaku makan restrained eating (p=0,018) dan body image (p=0,000). Tidak terdapat hubungan signifikan antara perilaku makan emotional eating dan external eating terhadap status gizi (p>0,05). Dapat disimpulkan bahwa perilaku makan dan persepsi body image memengaruhi status gizi siswa., These days, adolescence begine to pay attention to the physical changes that occur to them and often feel dissatisfied with their body shape. This can encourage adolescents to make certain efforts to make the body shape according to their wishes, such as limiting food intake and doing excessive diets that can affect eating behavior, body image, and nutritional status. The purpose of this study was to analyze the correlation between eating behavior and body image with nutritional status among high school students in Bogor. The design of this study was a cross-sectional study. The number of samples used in this study were 114 high school students. Data was collected through interviews and self-administrated online. Most of the subjects had normal nutritional status (81.6%), belonged to the external eating behavior (75.4%), have a negative body image perception (51.8%), had unhealthy eating habits (53.5%). There is a significant relationship between nutritional status in high school students with restrained eating (p=0.018) and body image (p=0.000). However, there is no significant relationship between emotional eating and external eating behavior on nutritional status (p>0.05). It can be concluded that eating behavior and perception of body image affect the nutritional status of students.
Keyword: adolescent, body image, nutritional status, food habits, eating behavior

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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