The NCAR team spent the next ten years working on the problem with researchers at airlines, universities, the F.A.A., NASA, and NOAA—the National Oceanic and Atmospheric Administration. “It was a national imperative,” Cornman said. Luckily, the beginnings of a solution were already in place. The team at NCAR had used sophisticated new Doppler radar systems to detect microbursts. When those were added to the wind detectors already installed at many airports, and the two systems were integrated with software that Cornman developed, microbursts could be detected as they were happening. “A problem where hundreds of people were dying suddenly stopped,” Cornman said. The last time a commercial flight was downed by a microburst in the U.S. was in 1994.
The alert came around 7pm.。关于这个话题，PDF资料提供了深入分析
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Most guys have a love-hate relationship with dating apps. But between work and life, meeting someone organically can feel nearly impossible. That's the promise of online dating — an unlimited number of meet-cutes right to your phone, no serendipity required. Of course, the reality of online dating is often quite different. But don't get discouraged. The Mashable Dating & Relationships team has spent years testing the most popular dating apps for men, and we can tell you which apps are most likely to connect you with the right person for you.。PDF资料是该领域的重要参考
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