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1 day ago · Most receivers have a track algorithm, sometimes called a tracker, that combines sets of satellite measurements collected at different times—in effect, taking advantage of the fact that successive receiver positions are usually close to each other. After a set of measurements are processed, the tracker predicts the receiver location ...
- United States
- Military, civilian
- Operational
- US Space Force
1 day ago · Other corrections must be made to account for the proportion of 14 C in different types of organisms (fractionation), and the varying levels of 14 C throughout the biosphere (reservoir effects). Additional complications come from the burning of fossil fuels such as coal and oil, and from the above-ground nuclear tests performed in the 1950s and ...
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1 day ago · A TEM image of a cluster of poliovirus.The polio virus is 30 nm in diameter. Operating principle of a transmission electron microscope. Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image.
2 minutes ago · Search the MCLab Group List of Papers. MCLab Group List of Papers
1 day ago · Robert Strange McNamara (/ ˈ m æ k n ə m ær ə /; June 9, 1916 – July 6, 2009) was an American businessman and government official who served as the eighth United States secretary of defense from 1961 to 1968 under presidents John F. Kennedy and Lyndon B. Johnson.
- 1940–1946
- 3, including Craig
1 day ago · In general, photosynthesis in cyanobacteria uses water as an electron donor and produces oxygen as a byproduct, though some may also use hydrogen sulfide a process which occurs among other photosynthetic bacteria such as the purple sulfur bacteria. Carbon dioxide is reduced to form carbohydrates via the Calvin cycle.
1 day ago · 99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object with a diameter of 370 metres (1,210 feet) that caused a brief period of concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April 13, 2029.
