Virtual reality(VR)and augmented reality(AR)are revolutionizing our lives.Near-eye displays are crucial technologies for VR and AR.Despite the rapid advances in near-eye display technologies,there are still challenges...Virtual reality(VR)and augmented reality(AR)are revolutionizing our lives.Near-eye displays are crucial technologies for VR and AR.Despite the rapid advances in near-eye display technologies,there are still challenges such as large field of view,high resolution,high image quality,natural free 3D effect,and compact form factor.Great efforts have been devoted to striking a balance between visual performance and device compactness.While traditional optics are nearing their limitations in addressing these challenges,ultra-thin metasurface optics,with their high light-modulating capabilities,may present a promising solution.In this review,we first introduce VR and AR near-eye displays,and then briefly explain the working principles of light-modulating metasurfaces,review recent developments in metasurface devices geared toward near-eye display applications,delved into several advanced natural 3D near-eye display technologies based on metasurfaces,and finally discuss about the remaining challenges and future perspectives associated with metasurfaces for near-eye display applications.展开更多
After the first concrete was poured on December 9,2012 at the Shidao Bay site in Rongcheng,Shandong Province,China,the construction of the reactor building for the world’s first high-temperature gascooled reactor peb...After the first concrete was poured on December 9,2012 at the Shidao Bay site in Rongcheng,Shandong Province,China,the construction of the reactor building for the world’s first high-temperature gascooled reactor pebble-bed module(HTR-PM)demonstration power plant was completed in June,2015.Installation of the main equipment then began,and the power plant is currently progressing well toward connecting to the grid at the end of 2017.The thermal power of a single HTR-PM reactor module is 250 MWth,the helium temperatures at the reactor core inlet/outlet are 250/750℃,and a steam of 13.25 MPa/567℃ is produced at the steam generator outlet.Two HTR-PM reactor modules are connected to a steam turbine to form a 210 MWe nuclear power plant.Due to China’s industrial capability,we were able to overcome great difficulties,manufacture first-of-a-kind equipment,and realize series major technological innovations.We have achieved successful results in many aspects,including planning and implementing R&D,establishing an industrial partnership,manufacturing equipment,fuel production,licensing,site preparation,and balancing safety and economics;these obtained experiences may also be referenced by the global nuclear community.展开更多
基金supports from the National Key Research and Development Program of China (2021YFB2802100)the National Natural Science Foundation of China (62075127 and 62105203).
文摘Virtual reality(VR)and augmented reality(AR)are revolutionizing our lives.Near-eye displays are crucial technologies for VR and AR.Despite the rapid advances in near-eye display technologies,there are still challenges such as large field of view,high resolution,high image quality,natural free 3D effect,and compact form factor.Great efforts have been devoted to striking a balance between visual performance and device compactness.While traditional optics are nearing their limitations in addressing these challenges,ultra-thin metasurface optics,with their high light-modulating capabilities,may present a promising solution.In this review,we first introduce VR and AR near-eye displays,and then briefly explain the working principles of light-modulating metasurfaces,review recent developments in metasurface devices geared toward near-eye display applications,delved into several advanced natural 3D near-eye display technologies based on metasurfaces,and finally discuss about the remaining challenges and future perspectives associated with metasurfaces for near-eye display applications.
文摘After the first concrete was poured on December 9,2012 at the Shidao Bay site in Rongcheng,Shandong Province,China,the construction of the reactor building for the world’s first high-temperature gascooled reactor pebble-bed module(HTR-PM)demonstration power plant was completed in June,2015.Installation of the main equipment then began,and the power plant is currently progressing well toward connecting to the grid at the end of 2017.The thermal power of a single HTR-PM reactor module is 250 MWth,the helium temperatures at the reactor core inlet/outlet are 250/750℃,and a steam of 13.25 MPa/567℃ is produced at the steam generator outlet.Two HTR-PM reactor modules are connected to a steam turbine to form a 210 MWe nuclear power plant.Due to China’s industrial capability,we were able to overcome great difficulties,manufacture first-of-a-kind equipment,and realize series major technological innovations.We have achieved successful results in many aspects,including planning and implementing R&D,establishing an industrial partnership,manufacturing equipment,fuel production,licensing,site preparation,and balancing safety and economics;these obtained experiences may also be referenced by the global nuclear community.
