Three typical kinds of building materials (painted drywall, ceiling tile, and carpet) have been tested to study the effects of environmental conditions (temperature, relative humidity, and air velocity) on the sorption of volatile organic compounds (VOCs) by building materials. It was found that the effects of environmental conditions on sorption were insignificant for the painted drywall due t...

As invisibility cloaking has recently become experimental reality, it is interesting to explore ways to reveal remaining imperfections. In essence, the idea of most invisibility cloaks is to recover the optical path lengths without an object (to be made invisible) by a suitable arrangement around that object. Optical path length is proportional to the time of flight of a light ray or to the opt...

in this paper the sociological approach of janet wolff and john thompson is used to identify and interpret the relationship between the evolution of persian carpet and its social context. the social context includes socio-economic, ideologican and political conditions surronding this evolution. to study persian carpet from the pazric rug from its initiation to the present time, based on numorou...

This paper studied the influence of various performance indexes machine-made sand on concrete work and admixture adaptability. The experimental results show: MB value has obvious negative effects admixtures. rock-powder content fineness module have relatively little working concrete. effect can also be reduced by adjusting ratio, but amount external additives a certain influence.