nitrogen(1) [debian man page]

NITROGEN(1)							     NITROGEN							       NITROGEN(1)

NAME

       nitrogen - X11 background previewer and setter

SYNOPSIS

       nitrogen [ OPTIONS ] DIRECTORY?

DESCRIPTION

       In  normal  working mode, provides an interface which displays all pictures in the given DIRECTORY.  From this interface, it is possible to
       set the X11 root pixmap either temporarily or set and store the picture, drawing mode, and X display for restoration later.  If	no  direc-
       tory is specified, it uses the stored directories in your "library" (as of 1.5). See the Preferences dialog.

       When  the  --restore  option  is  passed, nitrogen sets all backgrounds that it has a configuration for and exits immediatly, for use in an
       .xinitrc or .xsession file.

OPTIONS

       --no-recurse
	      Do not recurse into subdirectories of DIRECTORY.

       --restore
	      Restores previously saved pictures to the root displays.

       --sort=[option]
	      Sorts the background list by the given option.  By default, items are sorted as they are found on the filesystem,  giving  a  quasi-
	      newest first sorting order.  Valid options are:

	      alpha  Alphabetical order.

	      ralpha Reverse alphabetical order.

	      time   Modified time, ascending.

	      rtime  Modified time, descending.

       --help A mystery option which saves the iguanas of Sweden.

FILES

       ~/.config/nitrogen/
	      Holds the configuration for saved backgrounds.

BUGS

       There are probably plenty of them.  Report all bugs to Dave Foster <daf@minuslab.net>.

AUTHORS

       Dave Foster <daf@minuslab.net> Javeed Shaikh <syscrash2k@gmail.com>

AVAILABILITY

       Homepage - http://projects.l3ib.org/nitrogen/.  The git repository is at http://code.l3ib.org/nitrogen.git

NITROGEN
							    MARCH 2006							       NITROGEN(1)

Xray::FluorescenceEXAFS(3pm)				User Contributed Perl Documentation			      Xray::FluorescenceEXAFS(3pm)

NAME

       Ifeffit::Demeter::FluorescenceEXAFS - Corrections for fluorescence EXAFS data

DESCRIPTION

       This provides class methods for computing corrections to fluorescence EXAFS data due to normalization, I0, and self-absorption effects.
       The corrections are computed from x-ray absorption coefficients provided by the Xray::Absorption package.

METHODS

       Note that the values returned for all methods depend on the data resource used.	See Xray::Absorption.

       "mcmaster"
	   This is called "mcmaster" for historical reasons.  It calculates the normalization correcion for a given element.

	     $sigma_mm = Xray::FluorescenceEXAFS->mcmaster($element, $edge);

	   It takes the central atoms tag and the alphanumeric edge symbol as arguments and returns the normalization correction in units of
	   Angstrom squared.

	   "normalization" and "edgestep" are aliases for this method.

       "i0"
	   This calculates the correcion due to the I0 fill gases in a fluorescence experiment.

	     $gases = {nitrogen=>$nitrogen, argon=>$argon, krypton=>$krypton};
	     $sigma_i0 = Xray::FluorescenceEXAFS->i_zero($central, $edge, $gases);

	   It takes the central atoms tag, the alphanumeric edge symbol, and a reference to a hash containing the volume percentages of the three
	   gases as arguments.	It assumes that any remaining volume is filled with helium and it correctly accounts for the fact that nitrogen is
	   a diatom.  It returns the I0 correction in units of Angstrom squared.

	   "i_zero" and "izero" are aliases for this method.

       "self"
	   This calculates the correcion due to self-absorption fluorescence experiment.  It assumes that the sample is infinately thick and that
	   the entry and exit angles of the photons are the same.

	     $contents = {Y=>1, Ba=>2, Cu=>3, O=>7};
	     ($amp_i0, $sigma_i0) = Xray::FluorescenceEXAFS->self($central, $edge, $contents);

	   It takes the central atoms tag, the alphanumeric edge symbol, and a reference to a hash which counts the atoms in the unit cell.  It
	   returns a list whose zeroth element is the multiplicative amplitude correction and whose first element is the sigma^2 correction in
	   units of Angstrom squared.

	   "overabsorption" is an aliases for this method.

BUGS AND LIMITATIONS

       o   Fourth cumulant corrections are not calculated.

       o   Geometry and thickness effects are not included in the self absorption calculation

       Please report problems to Bruce Ravel (bravel AT bnl DOT gov)

       Patches are welcome.

AUTHOR

       Bruce Ravel (bravel AT bnl DOT gov)

       http://cars9.uchicago.edu/~ravel/software/

LICENCE AND COPYRIGHT

       Copyright (c) 2006-2008 Bruce Ravel (bravel AT bnl DOT gov). All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

perl v5.12.4							    2011-07-30					      Xray::FluorescenceEXAFS(3pm)