Cultural differences caused by the characteristics and customs of different ethnicities are similar in the causes leading to obesity but differ in intensity. Among the children in the US., obesity rates are higher among the non-whites compared to the Caucasians [36]. One of the key determinants lie in the social status of children which often dictates place of residence (e.g., low-income vs. affluent neighborhoods) [36]. Extrapolating to the UAE, a previous study reported that traditional and cultural factors and ethnic differences can play a role in the risk of childhood obesity [37]. The present study is limited by geographical and cultural factors since the parents who participated in the interviews were all UAE nationals and the region of the study was limited to only two of the 7 emirates of the UAE. However, although income and place of residence have been associated with obesity [36], in the present study the role of the above two factors on the perspectives of the parents is expected to be shaped by the high standard of living Emirati nationals have.
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Fiber metal laminates (FMLs) are high-performance hybrid structures based on alternatingstacked arrangements of fiber-reinforced plastic (FRP) plies and metal alloy layers. Inthis paper, effect of some geometrical and material parameters on free vibrations of FMLplates was studied. The first-order shear deformation theory (FSDT) as well as the Fourierseries method was used to analytically solve the governing equations of the compositeplate. The accuracy of the used method was verified by comparing the Rayleigh-Ritzanalytical method and the ABAQUS finite element software (numerical) method. The resultsindicated that some of the important parameters like sequence of metal layers, aspectratio (a/b) of plate and orientation of compositefibers were important factors affecting free vibration of the FMLs.
This paper considers the effect of the damage caused by transverse stresses due to a low velocity impact loading on composite plates. The dynamic response of a plate is calculated using the modal superposition technique based on the classical plate theory of sandwich plates (stratified) taking into account transverse shear effects. An indentation law, based on the Hertz theory and verified experimentally, governs the behavior of the plate subsequent to impact. The numerical time integration scheme is used to calculate the contact force at any instant by combining the indentation and the dynamic response of the structure. The obtained results show a good correlation between the shock results and their prediction. This method is equally applied to the contact force as well as to the deformation of the plate. The simulation permits a parametric study of the structure dimensions and the material properties on the global behavior of the plate. 2ff7e9595c
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