Because of the pandemic, we have not travelled by air for some 4+ years. This past week took our first trip to the west coast to spent the holidays with our family ( all 12 of them minus one daughter, son-in-law, and one grandson. It is amazing how much things have changed in just four years. ...
三时间维,一空间维 : 超光速观察者在 1+3 时空的相对论 诸平 Credit: Pixabay/CC0 Public Domain 据波兰华沙大学( University of Warsaw ) 2022 年 12 月 22 日报道,三时间维,一空间维 : 超光速观察者在 1+3 时空的相对论( Three time dimensions, one space dimension: Relativity of sup ...
科学家根据需要顺时针或逆时针转动单个分子 诸平 Fig. 1 Scanning tunneling microscopy (STM) image of a rotating europium (Eu) complex on a gold sheet. The dark spot in disc indicates the single Eu atom. Credit: Argonne National Laboratory Fig. 2 Controlled rotation of Eu compl ...