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简体中文 Arthur B. C. Walker, Jr., American physicist and academic (b. 1936)
Arthur Bertram Cuthbert Walker Jr. (August 24, 1936 – April 29, 2001) was an African-American solar physicist and a pioneer of EUV/XUV optics. He is most noted for having developed normal incidence multilayer XUV telescopes to photograph the solar corona. Two of his sounding rocket payloads, the Stanford/MSFC Rocket Spectroheliograph Experiment and the Multi-Spectral Solar Telescope Array, recorded the first full-disk, high-resolution images of the Sun in XUV with conventional geometries of normal incidence optics; this technology is now used in solar telescopes such as SOHO/EIT and TRACE, and in the fabrication of microchips via ultraviolet photolithography.
2001Apr, 29
Arthur B. C. Walker, Jr.
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Events on 2001
- 6May
Pope John Paul II
During a trip to Syria, Pope John Paul II becomes the first pope to enter a mosque. - 11Sep
September 11 attacks
Two hijacked aircraft crash into the World Trade Center in New York City, while a third smashes into The Pentagon in Arlington County, Virginia, and a fourth into a field near Shanksville, Pennsylvania, in a series of coordinated suicide attacks by 19 members of al-Qaeda. A total of 2,996 people are killed. - 14Sep
September 11, 2001 attacks
Historic National Prayer Service held at Washington National Cathedral for victims of the September 11 attacks. A similar service is held in Canada on Parliament Hill, the largest vigil ever held in the nation's capital. - 17Sep
September 11 attacks
The New York Stock Exchange reopens for trading after the September 11 attacks, the longest closure since the Great Depression. - 7Oct
War in Afghanistan (2001-2014)
The Global War on Terrorism begins as a result of the September 11 attacks. The U.S. invasion of Afghanistan initiates with an air assault and covert operations on the ground.