Abstract Optical devices capable of suppressing diffraction nature light are great technological importance to many nanophotonic applications. One important technique achieve diffractionless optics is exploit field canalization effect. However, current platforms based on metamaterial structures typically suffer from strict loss-confinement trade-off, or lack dynamic reconfigurability over devic...

Earthquake force, loading more than structural capacity, cracking, material fatigue and the other unpredicted events were undeniable in the structure life cycle in order that environmental conditions of the structure would be changed and treats health. Damage of structures such as crack, corrosion of the post tension cables from inappropriate grouting of the post tension structures and etc. can...

Most acoustic levitation techniques are limited to objects smaller than half the wavelength. To overcome this limit, different strategies have been proposed for suspending macroscopic in mid-air. Two approaches levitate spherical and non-spherical recently presented: acoustical virtual vortices boundary hologram method. However, former approach places high demands on available hardware due mand...

abstract: compaction under tractors tires is of special concern because the weight of these machines has increased dramatically in the last years. these machines and others associated with crop cultural practices weight enough to significantly compact the soil, especially if the soil is soft with high moisture content during tilling, planting, or harvesting. the stress distribution and the size...

background. the aim of this study was to assess the relationship between genetic taste sensitivity, dietary preferences and salivary flow rate in 6‒14-year-old children for identification of individuals at higher risk of developing dental caries. methods. a total of 500 children 6‒14 years of age, of both genders, who reported to the department of oral medicine and radiology, were included. pro...