This letter is to confirm that _____ has applied to become a volunteer with _____ JCR Patrol. As part of the screening process for adults who work with this youth program, all volunteers are required ...

School of Physics and Technology, Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China ...

Huazhong University of Science and Technology, School of Optical and Electronic Information, National Engineering Research Center for Next Generation Internet Access System (NGIA), Wuhan 430074, Hubei ...