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As a star runs out of fuel, it will billow out to a million times its original size, engulfing any matter — and planets — in its wake. Scientists have observed hints of stars just before, and shortly ...
Real or fake text? We can learn to spot the difference（图）
Computer Science Artificial Intelligence 人工智能
2023/6/29
The most recent generation of chatbots has surfaced longstanding concerns about the growing sophistication and accessibility of artificial intelligence.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Estimating Factor-Based Spot Volatility Matrices with Noisy and Asynchronous High-Frequency Data
噪声 异步高频 数据估算 因子 现货波动率 矩阵
2023/5/4
With noisy and asynchronous high-frequency data collected for an ultra-large number of assets, we estimate high-dimensional spot volatility matrices satisfying a low-rank plus sparse structure. A loca...
Mars Global Surveyor Update: Mars Reconnaissance Orbiter Fails to Spot Missing Spacecraft（图）
Mars Reconnaissance Orbiter Spacecraft
2006/12/4
November 21, 2006，As was reported here last week, NASA's Mars Global Surveyor spacecraft has been missing in action since November 5, three days after the spacecraft first reported a problem with one ...