Ulf geomagnetic changes associated with large earthquakes .
大地震相关之地磁超低频变化。
In 2006 sir john pendry of imperial college , london , and ulf leonhardt of the university of st andrews independently worked out how it might be done in a limited way .
" It 's a beautiful fundamental experiment , " says ulf leonhardt of the university of st andrews in the uk , who was not involved in the work . " It 's just fun , good physics . "
To model how light 's path would change in space curved by gravity , ulf peschel of the university of erlangen-nuremberg in germany and colleagues constructed smooth 3d objects and sent laser beams shooting along their surfaces ( physical review letters , in press ) .