失去的70天！从信心满满到手忙脚乱 美国新冠疫情何以至此
监制| 唐怡 陆毅制片人 | 赵新宇 郑弘策划 | 关美璐编辑 | 金律成视频 | 杜通 曹楚 王默晗 丁韬燃参考文章BostonGlobe.com. 2020. A President Unfit For A Pandemic - The Boston Globe. [onli
模型能感知调整3D物体位姿吗？首个交互式投影对齐空间推理基准
认出一个物体之后，换个角度还能认出来，进一步想象它转动后的样子，这些都涉及空间感知。人类需要在头脑中表示物体的形状与方向，理解不同视角之间的关系，并从二维投影中推断三维几何。
盛夏临近，日本多家企业推出夏季清凉口罩
日本多家企业推出令人感觉凉快、透气的清凉口罩，抵御新冠病毒的传播，还可以吸热吸汗防中暑。Mizuno's masks are made with a soft stretch tricot material that is used for its swimsuits.
顶级期刊复盘武汉疫情92天：5阶段，2月前医护感染风险高
当地时间4月10日，顶级医学期刊《美国医学会杂志》在线发表了上述研究团队联合完成的一项研究“Associationof Public Health Interventions With the Epidemiology of the COVID-19 Outbreak in Wu
失去的70天！从信心满满到手忙脚乱 美国新冠疫情何以至此
监制| 唐怡 陆毅制片人 | 赵新宇 郑弘策划 | 关美璐编辑 | 金律成视频 | 杜通 曹楚 王默晗 丁韬燃参考文章BostonGlobe.com. 2020. A President Unfit For A Pandemic - The Boston Globe. [onli
银河系居然是弯的！天文学家绘制三维地图
我们一直认为银河系像一张平滑的光盘，但天文学家最近绘制出的银河系三维地图却显示，银河系星系盘是弯曲的，厚度不一，而且距离中心越远处越厚。
今年樱花何时开放？原来日本是这样预测樱花花期的
在如今的信息时代，樱花花期的预测也紧跟潮流，除了人员观测，大数据、算法、甚至人工智能齐上阵。随着春天的临近，日本的天气预报员们将面临着每年最重要的一项任务：预测樱花开放的准确日期。
《自然》（20211223出版）一周论文导读
Magnetars are strongly magnetized， isolated neutron stars with magnetic fields up to around 1015 gauss， luminosities of approximately 1031-1036 ergs per second and rotation periods of about 0.3–12.0 s. Very energetic giant flares from galactic magnetars have been detected in hard X-rays and soft γ-rays， and only one has been detected from outside our galaxy. During such giant flares， quasi-periodic oscillations with low and high frequencies have been observed， but their statistical significance has been questioned. High-frequency QPOs have been seen only during the tail phase of the flare. Here we report the observation of two broad QPOs at approximately 2，132 hertz and 4，250 hertz in the main peak of a giant γ-ray flare in the direction of the NGC 253 galaxy， disappearing after 3.5 milliseconds. The flare was detected on 15 April 2020 by the Atmosphere–Space Interactions Monitor instrument aboard the International Space Station， which was the only instrument that recorded the main burst phase in the full energy range without suffering from saturation effects such as deadtime and pile-up. Along with sudden spectral variations， these extremely high-frequency oscillations in the burst peak are a crucial component that will aid our understanding of magnetar giant flares.
失去的70天！从信心满满到手忙脚乱 美国新冠疫情何以至此
60万确诊、25575例死亡，50个州、首都华盛顿特区及美属维京群岛、北马里亚纳群岛、关岛和波多黎各4个海外领地，全部进入了“重大灾难状态”，这在美国历史上，前所未有。一向被认为是应对流行病准备最充分的美国，为何却被新冠病毒灾难性地击败？