https://www.daiphys.com/portal/ 2026-04-30T21:03:10+00:00 https://www.daiphys.com/portal/ https://www.daiphys.com/portal/_media/wiki/dokuwiki.svg text/html 2022-12-15T03:52:05+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/abundance.html?rev=1671076325&do=diff Abundance Solar Abundance <http://heasarc.gsfc.nasa.gov/docs/software/lheasoft/xanadu/xspec/manual/XSabund.html> ## Allen's Astrophysical Quantities, ed. A. N. Cox (New York: Springer-Verlag), 27 Fraction of H (X) = 0.707 +/- 2.5 % Fraction of He (Y) = 0.274 +/- 6 % Fraction of Others (Z) = 0.0189 +/- 8.5 % text/html 2023-04-14T15:38:33+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/constants.html?rev=1681486713&do=diff Constants Physical Constants <http://physics.nist.gov/cuu/Constants/Table/allascii.txt> <https://github.com/tenoto/repository/raw/master/docs/physical_const_entv190819j.pdf> text/html 2023-03-10T07:45:39+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/dumond.html?rev=1678434339&do=diff DuMond Basics Vertical Axis : Relative Energy (lambda = dE/E) Horizontal Axis : Incident Angle or Beam Divergence References DuMond, J. W. M., 1937, Phys. Rev., 52, 872–883 text/html 2022-12-15T03:21:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/gauss.html?rev=1671074513&do=diff Gaussian Sigma vs FWHM ## sigma = 68.2% integrated area ## fwhm = 50.0% of the gaussian peak fwhm = (2.00 * numpy.sqrt(2.00 * numpy.log(2.00))) * sigma fwhm = 2.3548200450309493 * sigma text/html 2023-03-10T05:55:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/index.html?rev=1678427746&do=diff Physics * Abundance * Constants * DuMond * Gaussian * Tools * X-ray text/html 2022-12-16T06:53:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.daiphys.com/portal/physics/xray.html?rev=1671173624&do=diff X-ray Properties <http://xdb.lbl.gov/>