In the application research of large-scale quantum communication network, one generally realizes resource allocation by constructing virtual service network and mapping it to actual physical space. this process, some assumptions are often made simplify model. For example, key in topology is assumed be a fixed value, that is, conditions performance differences supply caused different protocols i...

Technological change is transforming media industries. Digitization lowers the cost of recording, storage, reproduction and distribution, while computer-based editing facilitates higher quality and special e¤ects. With electronic distribution, a vast range of content can be made available to consumers at little cost. Meanwhile, the distribution of industry production and sales appears to be shi...

105 Abstract: Origin of A-type alkali feldspar granites is currently the subject of a world-wide debate. Contrasting hypotheses have been proposed, which range from an entirely crustal origin to an almost complete mantle derivation. A-type alkali feldspar granites belong to either unimodal granite (rhyolite)-dominated association, or bimodal gabbro (basalt)-granite (rhyolite) suite. It is argue...