20200305出版《自然》论文导读
翻译| 李言Nature, 5 March 2020, Volume 579 Issue 7797《自然》2020年3月5日,第579卷7797期物理学PhysicsStrange-metal behaviour in a pure ferromagnetic Kondo lat
当AI又要看视频又要听声音时,怎么才能不把自己累死
你有没有想过这样一个场景:让你一边看一部两小时的电影,一边全神贯注地听里面的每一句对白和每一个背景音,然后立刻回答关于剧情的问题。人脑其实做不到把每一帧画面和每一段声音都记得清清楚楚,我们会自动筛选,抓住重点,忽略掉大部分重复的、不重要的信息。
《科学》(20220624出版)一周论文导读
Abstract:Rivers support indispensable ecological functions and human health and infrastructure. Yet limited river sampling hinders our understanding of consequential changes to river systems. Satellite-based estimates of suspended sediment concentration and flux for 414 major rivers reveal widespread global change that is directly attributable to human activity in the past half-century. Sediment trapping by dams in the global hydrologic north has contributed to global sediment flux declines to 49% of pre-dam conditions. Recently, intensive land-use change in the global hydrologic south has increased erosion, with river suspended sediment concentration on average 41±7% greater than in the 1980s. This north-south divergence has rapidly reconfigured global patterns in sediment flux to the oceans, with the dominant sources of suspended sediment shifting from Asia to South America.
Hainan special customs operations: China's next era of opening-up
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《自然》(20190627出版)一周论文导读
Volume570Issue7762《自然》2019年6月27日,第570卷7762期仿生学BionicScienceFlightoftheRoboBee机器蜂的飞行作者:NoahT。
《自然》(20200430出版)一周论文导读
▲AbstractInteractions between atoms and light in optical cavities provide a means of investigating collective quantum physics in controlled
China weathers Hormuz disruptions, buoyed by years of energy diversification
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术后前外侧腹壁影像评估的解剖学基础
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《自然》(20200305出版)一周论文导读
翻译| 李言Nature, 5 March 2020, Volume 579 Issue 7797《自然》2020年3月5日,第579卷7797期物理学PhysicsStrange-metal behaviour in a pure ferromagnetic Kondo lat
《科学》(20230203)一周论文导读
Abstract:Photoredox catalysis enables distinctive and broadly applicable chemical reactions, but controlling their selectivity has proven to be difficult. The pursuit of enantioselectivity is a particularly daunting challenge, arguably because of the high energy of the activated radical intermediates, and previous approaches have invariably required pairing of the photoredox catalytic cycle with an additional activation mode for asymmetric induction. A potential solution for photoredox reactions proceeding via radical ions would be catalytic pairing with enantiopure counterions. However, although attempts toward this approach have been described, high selectivity has not yet been accomplished. Here we report a potentially general solution to radical cation–based asymmetric photoredox catalysis. We describe organic salts, featuring confined imidodiphosphorimidate counteranions that catalyze highly enantioselective -cross cycloadditions of styrenes.