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Understanding how materials evolve under non-equilibrium conditions requires experimental tools capable of capturing both local structural changes and their ultrafast dynamics. Ultrafast X-ray pair distribution function (uf-PDF) analysis—based on total scattering measurements enabled by femtosecond X-ray free-electron lasers (XFELs)—now allows direct access to transient local structures beyond the...

题目：Dissecting Cross-Stock Momentum（理解跨股动量） 摘要：Aiming to capture underreaction to information, previous studies document cross-stock momentum (CSM) where returns of some stocks predict those of related stocks. Re-examining this literature, we document the puzzling fact that CSM returns tend to revert over time. To understand the source of this reversal, we decompose CSM into two disti...

活体光学显微成像旨在在体、原位、无创地观察活体生物组织或模式动物体内的（亚）细胞结构并跟踪其功能动态。相比于离体组织切片或贴壁培养细胞等薄样本，活体光学三维显微成像有两大特点，同时也是技术挑战：一是需要具备光学层析（也称深度层析）能力，从而在无需物理切片的情况下实现活体“厚样本”的在体原位三维成像；二是需要足够的时空分辨率，以记录活体样本或模式动物的高通量三维结构与功能动态信息，并有效对抗活体组织...