Arctic sea ice extent through most of April changed very little. Only at the end of the month did extent begin to decline. Because the month started with unusually low extent, however, the average ...

Department of Physics, National Cheng Kung University, Tainan 701, Taiwan Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 701401 Taiwan ...

"For example, a classical standing-wave light field (composed of two counter-propagating light waves) with periodic intensity maxima and minima is now described as an alternating succession of ...