Judul: Body Image, Kebiasaan Makan, dan Kepercayaan Diri pada Siswi dengan Status Gizi Obese dan Non Obese di SMAN 3 Bogor
Abstrak: Masa remaja merupakan masa seorang individu mengalami perkembangan secara psikologis dan perubahan fisik. Hal ini disebabkan karena mereka merasa tidak puas dengan penampilan fisik dirinya yang akan mempengaruhi kepercayaan diri dan kebiasaan makan. Kebiasaan makan yang buruk dan kepercayaan diri yang rendah akan mempengaruhi status gizi seseorang. Tujuan dari penelitian ini adalah untuk menganalisis body image, kebiasaan makan dan kepercayaan diri pada siswi dengan status gizi obese dan non obese di SMAN 3 Bogor. Desain penelitian ini adalah cross-sectional study dan pengambilan subjek menggunakan metode purposive sampling. Subjek yang digunakan pada penelitian ini berjumlah 54 subjek dengan 27 subjek kelompok obese dan 27 subjek kelompok non obese dengan usia 14-16 tahun dengan status gizi kelompok obese dan kelompok non obese. Berdasarkan hasil penelitian diketahui bahwa mayoritas subjek berusia 15 tahun (80%), body image negatif pada kelompok obese (59.7%) serta kelompok non obese (66.7%), kebiasaan makan tidak sehat pada kelompok non obese (63%) kebiasaan makan sehat pada kelompok obese (55.6%), kepercayaan diri rendah pada kelompok obese (53.8%), dan kepercayaan diri tinggi pada kelompok non obese (53.6%). Berdasarkan uji chi-square tidak ditemukan hubungan yang signifikan antara body image, kebiasaan makan, dan kepercayaan diri dengan status gizi obese dan non obese (p>0.05).
Keyword: body image, kebiasaan makan, kepercayaan diri, status gizi

Judul: Kebiasaan Makan dan Perspsi Body Image pada Siswa smp Berstatus Gizi Lebih dan Normal
Abstrak: The purpose of this study was to analyze the differences between food habits and body image perception and the correlation between the two variables observed in overweight and normal nutritional status of junior high school boys students. This research used cross sectional design involved 100 students, 50 overweight and 50 normal status from two schools in Bogor. The data consist of individual and family characteristic, food habits, nutritional knowledge, body image perceptions, and healthy status. Most of the subject of 12 years old, with family members in the middle category, dan almost all parents are college graduates. Subjects have middle category of nutritional knowledge, and topic about healthy and safe food is answered correctly only by one third of the subjects.. The result found no difference in food habit (p>0.05), but significant difference (p=0.000) in body image perception. Was found no correlation (p>0.05) was between food habits and body image perception, but was found significant correlation exist (p=0.027) between nutritional knowledge and body image perception.
Keyword: boys., adolescent, body image, food habit

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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