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  2. Numerical weather prediction - Wikipedia

    en.wikipedia.org/wiki/Numerical_weather_prediction

    Weather reconnaissance aircraft, such as this WP-3D Orion, provide data that is then used in numerical weather forecasts.. The atmosphere is a fluid.As such, the idea of numerical weather prediction is to sample the state of the fluid at a given time and use the equations of fluid dynamics and thermodynamics to estimate the state of the fluid at some time in the future.

  3. Direction finding - Wikipedia

    en.wikipedia.org/wiki/Direction_finding

    Radio direction finding differs from radar in that only the direction is determined by any one receiver; a radar system usually also gives a distance to the object of interest, as well as direction. By triangulation , the location of a radio source can be determined by measuring its direction from two or more locations.

  4. Ground-penetrating radar - Wikipedia

    en.wikipedia.org/wiki/Ground-penetrating_radar

    Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. It is a non-intrusive method of surveying the sub-surface to investigate underground utilities such as concrete, asphalt, metals, pipes, cables or masonry. [ 1 ]

  5. X band - Wikipedia

    en.wikipedia.org/wiki/X_band

    X band is used in radar applications, including continuous-wave, pulsed, single-polarization, dual-polarization, synthetic aperture radar, and phased arrays. X-band radar frequency sub-bands are used in civil , military , and government institutions for weather monitoring , air traffic control , maritime vessel traffic control , defense ...

  6. Northrop B-2 Spirit - Wikipedia

    en.wikipedia.org/wiki/Northrop_B-2_Spirit

    B-2 Spirit A U.S. Air Force B-2 Spirit flying over the Pacific Ocean in 2016 General information Type Stealth strategic heavy bomber National origin United States Manufacturer Northrop Corporation Northrop Grumman Status In service Primary user United States Air Force Number built 21 History Manufactured 1987–2000 Introduction date 1 January 1997 First flight 17 July 1989 ; 35 years ago ...

  7. Dun & Bradstreet - Wikipedia

    en.wikipedia.org/wiki/Dun_&_Bradstreet

    The Dun & Bradstreet Holdings, Inc. is an American company that provides commercial data, analytics, and insights for businesses. [3] Headquartered in Jacksonville, Florida, the company offers a wide range of products and services for risk and financial analysis, operations and supply, and sales and marketing professionals, as well as research and insights on global business issues.

  8. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.

  9. Eugene, Oregon - Wikipedia

    en.wikipedia.org/wiki/Eugene,_Oregon

    Eugene (/ j uː ˈ dʒ iː n / yoo-JEEN) is a city in and the county seat of Lane County, Oregon, United States.It is located at the southern end of the Willamette Valley, near the confluence of the McKenzie and Willamette rivers, about 50 miles (80 km) east of the Oregon Coast.

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