VACUUM BIREFRINGENCE AT X-RAY FREE-ELECTRON LASERS

Vacuum birefringence at x-ray free-electron lasers

We study Cosmetics the perspectives of measuring the phenomenon of vacuum birefringence predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL) alone.We devise an experimental scheme allowing two consecutive XFEL pulses to collide under a finite angle, and thus act as both pump and probe field for the effect.The signature of

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Multi-version consolidation method for block-level backup data

Historical version backup data query efficiency was dependent on the version chain length in a multi-version backup data storage system.A novel block-level backup data multi-version consolidation ZERO TAB AUTO DISHWASHING method was presented for this problem.Any version of a historical full system snapshot could be generated within the incremental

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