1. Application Procedure of 2010 World FairOn May 2, 2001, China, the first country, submitted formally an application for holding 2010 Shanghai World Fair to theBureau of International Exhibition (BIE). There were Ch...1. Application Procedure of 2010 World FairOn May 2, 2001, China, the first country, submitted formally an application for holding 2010 Shanghai World Fair to theBureau of International Exhibition (BIE). There were China, Russia, ROK, Poland, Mexico and Argentina (Afterwards ArgentinaWithdrew) formally submitting applications. The deadline for application is six months after the application was formally submittedby the first country. Then BIE sent investigation delegation to investigate various countries that made applications, and submittedreports to the Executive Commission and General Assembly. China stated reports at BIE 129th, 130th and 131st General Assembliesin June and November 2001 and July 2002 respectively. In December 2002, China stated the last report at BIE 132nd GeneralAssembly.展开更多
In theoty, engineered anomalous transmission in passive materials and waveguide devices can be used to compensate for wavetorm distortions. However, they suffer from inherent dissipation. Recently, active non-Foster e...In theoty, engineered anomalous transmission in passive materials and waveguide devices can be used to compensate for wavetorm distortions. However, they suffer from inherent dissipation. Recently, active non-Foster elements with imaginary immittance monotonically decreasing with frequency have shown important potentials in broadening bandwidths of electromagnetic devices. So far, they are implemented besed on negative impedance convertors （NICs） loaded with Foster devices. This makes them intrinsically one-port elements and thus cannot be used to compensate for distortions of signals. We construct a two-port network with a non-Foster transmission coefticient based on an unconventional use of NICs. Simulation and experiments show that it can compensate for extremely distorted signals. The proposed method can be used to broaden existing applications in different areas such as antennas, circuits and systems, and physical-layer signal processing.展开更多
Perovskite quantum dots light-emitting diodes(PeLEDs)have been developed for next-generation high resolution display applications.However,the hindered charge injection and massive charge trapping due to the insulating...Perovskite quantum dots light-emitting diodes(PeLEDs)have been developed for next-generation high resolution display applications.However,the hindered charge injection and massive charge trapping due to the insulating and defective surface of quantum dots(QDs)usually lead to a slow rise in electroluminescence(EL)response,which makes it challenging to realize ultra-high refresh rate displays with nanosecond response.Herein,an ionic liquid 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate([BMIM]OTF)was used to enhance the crystallinity and reduce the surface area ratio of QDs,which effectively decreases defect state and injection barrier at the interface.Therefore,the rise time of EL response with steady-state is successfully reduced by over 75%.We further reduce the capacitance effect by decreasing the light-emitting unit area.Thus,ultra-high resolution(9072 pixel per inch)PeLEDs with light-emitting pixel size of 1.3μm were realized,achieving a brightness exceeding 170,000 cd/m^(2) and an external quantum efficiency up to 15.79%.Moreover,it achieves nanosecond ultrafast response time under steady-state,which is the fastest response time of PeLEDs reported so far.Our work represents the most advanced performance of ultra-high-resolution PeLEDs,and provides in-depth insights into the mechanism of improving their response speed,showing significant potential in high refresh rate active display application.展开更多
文摘1. Application Procedure of 2010 World FairOn May 2, 2001, China, the first country, submitted formally an application for holding 2010 Shanghai World Fair to theBureau of International Exhibition (BIE). There were China, Russia, ROK, Poland, Mexico and Argentina (Afterwards ArgentinaWithdrew) formally submitting applications. The deadline for application is six months after the application was formally submittedby the first country. Then BIE sent investigation delegation to investigate various countries that made applications, and submittedreports to the Executive Commission and General Assembly. China stated reports at BIE 129th, 130th and 131st General Assembliesin June and November 2001 and July 2002 respectively. In December 2002, China stated the last report at BIE 132nd GeneralAssembly.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61771421,61771422,61528014 and 6140139the Zhejiang Provincial Natural Science Foundation under Grant No LY16F010009
文摘In theoty, engineered anomalous transmission in passive materials and waveguide devices can be used to compensate for wavetorm distortions. However, they suffer from inherent dissipation. Recently, active non-Foster elements with imaginary immittance monotonically decreasing with frequency have shown important potentials in broadening bandwidths of electromagnetic devices. So far, they are implemented besed on negative impedance convertors （NICs） loaded with Foster devices. This makes them intrinsically one-port elements and thus cannot be used to compensate for distortions of signals. We construct a two-port network with a non-Foster transmission coefticient based on an unconventional use of NICs. Simulation and experiments show that it can compensate for extremely distorted signals. The proposed method can be used to broaden existing applications in different areas such as antennas, circuits and systems, and physical-layer signal processing.
基金supported by the National Key Research and Development Program of China(2022YFB3606500)'Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ126)the National Natural Science Foundation of China(62075043,62305063,61905042).
文摘Perovskite quantum dots light-emitting diodes(PeLEDs)have been developed for next-generation high resolution display applications.However,the hindered charge injection and massive charge trapping due to the insulating and defective surface of quantum dots(QDs)usually lead to a slow rise in electroluminescence(EL)response,which makes it challenging to realize ultra-high refresh rate displays with nanosecond response.Herein,an ionic liquid 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate([BMIM]OTF)was used to enhance the crystallinity and reduce the surface area ratio of QDs,which effectively decreases defect state and injection barrier at the interface.Therefore,the rise time of EL response with steady-state is successfully reduced by over 75%.We further reduce the capacitance effect by decreasing the light-emitting unit area.Thus,ultra-high resolution(9072 pixel per inch)PeLEDs with light-emitting pixel size of 1.3μm were realized,achieving a brightness exceeding 170,000 cd/m^(2) and an external quantum efficiency up to 15.79%.Moreover,it achieves nanosecond ultrafast response time under steady-state,which is the fastest response time of PeLEDs reported so far.Our work represents the most advanced performance of ultra-high-resolution PeLEDs,and provides in-depth insights into the mechanism of improving their response speed,showing significant potential in high refresh rate active display application.
