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In radiation physics, kerma is an acronym for "kinetic energy released per unit mass" (alternately, "kinetic energy released in matter", [1] "kinetic energy released in material", [2] or "kinetic energy released in materials" [3]), defined as the sum of the initial kinetic energies of all the charged particles liberated by uncharged ionizing radiation (i.e., indirectly ionizing radiation such ...
There are also sporadic X-ray off durations. The spin period history of Centaurus X-3 shows a spin-up trend that is very prominent in the long-term decrease in its pulse period. This spin-up was first noted in Centaurus X-3 and Hercules X-1 and is now noted in other X-ray pulsars. The most feasible way of explaining the origin of this effect is ...
It is radiating 3.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,435 K. [2] 45 Boötis is a source of X-ray emission. [ 10 ] There is a magnitude 11.53 visual companion at an angular separation of 103.50 ″ along a position angle (PA) of 40°, as of 2012.
The first X-ray picture of the Sun from a rocket-borne telescope was taken by John V. Lindsay of the NASA Goddard Space Flight Center and collaborators in 1963. The first orbiting X-ray telescope flew on Skylab in the early 1970s and recorded more than 35,000 full-disk images of the Sun over a 9-month period. [3]
For example, it is not clear that enough matter can be accreted by a white dwarf, at the distance of the purported secondary star implied by the orbital period, sufficient to power an X-ray emission of nearly 10 33 erg/s or 100 YW. A neutron star could easily power this X-ray flux, but X-ray emission from neutron stars is known to be non ...
The 3D structure of human serum albumin has been determined by X-ray crystallography to a resolution of 2.5 ångströms (250 pm). [1] Albumin is a 65–70 kDa protein. Albumin comprises three homologous domains that assemble to form a heart-shaped protein. [2] Each domain is a product of two subdomains that possess common structural motifs. [2]
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Harald Trefall (10 November 1925 – 14 March 2008) was a Norwegian professor of experimental physics and far-right politician. He graduated from and worked at the University of Bergen, where he focused his work on cosmic radiation, and held a Ph.D. from the University of Oslo.