Over recent years, the phenomena, Web 2.0 has led to the growth of volunteered geographic information (VGI).The emergence of VGI has played an important role in providing timely data when the costs and its availability is a major concern particularly during emergency and humanitarian efforts.The worldwide crowdsourcing efforts through OpenStreetMap
The method of conversion, properties and usage of hydrophobic coatings on the bases of silicon dioxide is presented in the article.These layers are formed by use the silanes which are not react with water.What is more, these cheese slicer layers could provide not only great resistance to the effect of water molecules, but also better resistance to
With the explosive demand for wireless communications, users are always experiencing poor quality-of-services.Spectrum auction is a promising approach to allocate spectrum resources PRO-ADD in wireless networks.Most of the previous works ignored social characteristics of users in wireless networks which influence the allocation of spectrum resource
Diffraction in time manifests itself as the appearance of probability-density fringes when a Wash Tee matter wave passes through an opaque screen with abrupt temporal variations of transmission properties.Here we analytically describe the phase-space structure of diffraction-in-time fringes for a class of smooth time gratings.More precisely, we obt