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Light from the accretion disk around a supermassive black hole is scattered off the surrounding broad line region, causing a delayed echo at redder wavelengths. Reverberation mapping (or Echo mapping ) is an astrophysical technique for measuring the structure of the broad-line region (BLR) around a supermassive black hole at the center of an ...
Figure 1 shows the progression of events used in echo mapping, from the flash of light from the accretion disk to the echo of that light off the dust torus. JPL manages NEOWISE for NASA's Science Mission Directorate at the agency's headquarters in Washington. The Space Dynamics Laboratory in Logan, Utah, built the science instrument.
A typical shipboard ARPA/radar system. A marine radar with automatic radar plotting aid (ARPA) capability can create tracks using radar contacts. [1] [2] The system can calculate the tracked object's course, speed and closest point of approach [3] (CPA), thereby knowing if there is a danger of collision with the other ship or landmass.
Navigational instruments are instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction, etc. to arrive at the port or point of destination.
There's no foolproof way to know the future for Echo Global Logistics (NAS: ECHO) or any other company. However, certain clues may help you see potential stumbles before they happen -- and before ...
Magellan develops and distributes vehicle navigation, crossover GPS, and outdoor handheld navigation products. The Company also produces customized mapping software for topographic, marine, and street navigation. Current GPS products as of 2016 include: The Magellan RoadMate and Magellan Maestro series of portable car navigation systems
The latest 13F reporting period has come and gone, and Insider Monkey is again at the forefront when it comes to making use of this gold mine of data. We have processed the filings of the more ...
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