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@ONLINE{Doe:2009:Online,
author = {Doe, Ringo},
title = {This is a test entry of type {@ONLINE}},
month = jun,
year = {2009},
url = {http://www.test.org/doe/}
}

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Alpha-partcicle spectroscopy is a method for testing and measuring the properties of any alpha emitter, which is a class of radioactive particles the emit alpha particles, a bound collection of two protons and two neutrons

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@article{article,
author = {Peter Adams},
title = {The title of the work},
journal = {The name of the journal},
year = 1993,
number = 2,
pages = {201-213},
month = 7,
note = {An optional note},
volume = 4
}
@book{book,
author = {Peter Babington},
title = {The title of the work},
publisher = {The name of the publisher},
year = 1993,
volume = 4,
series = 10,
address = {The address},
edition = 3,
month = 7,
note = {An optional note},
isbn = {3257227892}
}
@booklet{booklet,
title = {The title of the work},
author = {Peter Caxton},
howpublished = {How it was published},
address = {The address of the publisher},
month = 7,
year = 1993,
note = {An optional note}
}
@conference{conference,
author = {Peter Draper},
title = {The title of the work},
booktitle = {The title of the book},
year = 1993,
editor = {The editor},
volume = 4,
series = 5,
pages = 213,
address = {The address of the publisher},
month = 7,
organization = {The organization},
publisher = {The publisher},
note = {An optional note}
}
@inbook{inbook,
author = {Peter Eston},
title = {The title of the work},
chapter = 8,
pages = {201-213},
publisher = {The name of the publisher},
year = 1993,
volume = 4,
series = 5,
address = {The address of the publisher},
edition = 3,
month = 7,
note = {An optional note}
}
@incollection{incollection,
author = {Peter Farindon},
title = {The title of the work},
booktitle = {The title of the book},
publisher = {The name of the publisher},
year = 1993,
editor = {The editor},
volume = 4,
series = 5,
chapter = 8,
pages = {201-213},
address = {The address of the publisher},
edition = 3,
month = 7,
note = {An optional note}
}
@manual{manual,
title = {The title of the work},
author = {Peter Gainsford},
organization = {The organization},
address = {The address of the publisher},
edition = 3,
month = 7,
year = 1993,
note = {An optional note}
}
@mastersthesis{mastersthesis,
author = {Peter Harwood},
title = {The title of the work},
school = {The school of the thesis},
year = 1993,
address = {The address of the publisher},
month = 7,
note = {An optional note}
}
@misc{misc,
author = {Peter Isley},
title = {The title of the work},
howpublished = {How it was published},
month = 7,
year = 1993,
note = {An optional note}
}
@phdthesis{phdthesis,
author = {Peter Joslin},
title = {The title of the work},
school = {The school of the thesis},
year = 1993,
address = {The address of the publisher},
month = 7,
note = {An optional note}
}
@proceedings{proceedings,
title = {The title of the work},
year = 1993,
editor = {Peter Kidwelly},
volume = 4,
series = 5,
address = {The address of the publisher},
month = 7,
organization = {The organization},
publisher = {The name of the publisher},
note = {An optional note}
}
@techreport{techreport,
author = {Peter Lambert},
title = {The title of the work},
institution = {The institution that published},
year = 1993,
number = 2,
address = {The address of the publisher},
month = 7,
note = {An optional note}
}
@unpublished{unpublished,
author = {Peter Marcheford},
title = {The title of the work},
note = {An optional note},
month = 7,
year = 1993
}
@ONLINE{Doe:2009:Online,
author = {Doe, Ringo},
title = {This is a test entry of type {@ONLINE}},
month = jun,
year = {2009},
url = {http://www.test.org/doe/}
}
@article
{ahu61,
author={Arrow, Kenneth J. and Leonid Hurwicz and Hirofumi Uzawa
},
title={Constraint qualifications in maximization problems
},
journal=
{Naval Research Logistics Quarterly},
volume={8},
year=1961
,
pages={175-191
}
}
@book{ab94,
author* = {Charalambos D. Aliprantis and Kim C. Border},
year = {1994},
title = {Infinite Dimensional Analysis},
publisher = {Springer},
address = {Berlin}
}
*A book must have either an author field or an editor field.
@incollection{m85,
author={Maskin, Eric S.},
year={1985},
title={The theory of implementation in {N}ash
equilibrium: a survey},
booktitle={Social Goals and Social Organization},
editor={Leonid Hurwicz and David Schmeidler and Hugo Sonnenschein},
pages={173-204},
publisher={Cambridge University Press},
address={Cambridge}
}
@inproceedings{ah2006,
author={Aggarwal, Gagan and Hartline, Jason D.},
year={2006},
title={Knapsack auctions},
booktitle={Proceedings of the 17th Annual ACM-SIAM Symposium on Discrete Algorithms},
pages={1083-1092},
publisher={Association for Computing Machinery},
address={New York}
}
@techreport{arrow48,
author = {Arrow, Kenneth J.},
title = {The possibility of a universal social welfare function},
institution = {RAND Corporation},
year = {1948},
number = {P-41},
type = {Report}
}
@unpublished{FudenbergKreps1988,
title = {A theory of learning, experimentation, and equilibrium in games},
author = {Fudenberg, Drew and Kreps, David M.},
year = {1988},
note = {Unpublished paper}
}

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@ARTICLE{2016ApJ...821...56F,
author = {{Fausnaugh}, M.~M. and {Denney}, K.~D. and {Barth}, A.~J. and
{Bentz}, M.~C. and {Bottorff}, M.~C. and {Carini}, M.~T. and
{Croxall}, K.~V. and {De Rosa}, G. and {Goad}, M.~R. and {Horne}, K. and
{Joner}, M.~D. and {Kaspi}, S. and {Kim}, M. and {Klimanov}, S.~A. and
{Kochanek}, C.~S. and {Leonard}, D.~C. and {Netzer}, H. and
{Peterson}, B.~M. and {Schn{\"u}lle}, K. and {Sergeev}, S.~G. and
{Vestergaard}, M. and {Zheng}, W.-K. and {Zu}, Y. and {Anderson}, M.~D. and
{Ar{\'e}valo}, P. and {Bazhaw}, C. and {Borman}, G.~A. and {Boroson}, T.~A. and
{Brandt}, W.~N. and {Breeveld}, A.~A. and {Brewer}, B.~J. and
{Cackett}, E.~M. and {Crenshaw}, D.~M. and {Dalla Bont{\`a}}, E. and
{De Lorenzo-C{\'a}ceres}, A. and {Dietrich}, M. and {Edelson}, R. and
{Efimova}, N.~V. and {Ely}, J. and {Evans}, P.~A. and {Filippenko}, A.~V. and
{Flatland}, K. and {Gehrels}, N. and {Geier}, S. and {Gelbord}, J.~M. and
{Gonzalez}, L. and {Gorjian}, V. and {Grier}, C.~J. and {Grupe}, D. and
{Hall}, P.~B. and {Hicks}, S. and {Horenstein}, D. and {Hutchison}, T. and
{Im}, M. and {Jensen}, J.~J. and {Jones}, J. and {Kaastra}, J. and
{Kelly}, B.~C. and {Kennea}, J.~A. and {Kim}, S.~C. and {Korista}, K.~T. and
{Kriss}, G.~A. and {Lee}, J.~C. and {Lira}, P. and {MacInnis}, F. and
{Manne-Nicholas}, E.~R. and {Mathur}, S. and {McHardy}, I.~M. and
{Montouri}, C. and {Musso}, R. and {Nazarov}, S.~V. and {Norris}, R.~P. and
{Nousek}, J.~A. and {Okhmat}, D.~N. and {Pancoast}, A. and {Papadakis}, I. and
{Parks}, J.~R. and {Pei}, L. and {Pogge}, R.~W. and {Pott}, J.-U. and
{Rafter}, S.~E. and {Rix}, H.-W. and {Saylor}, D.~A. and {Schimoia}, J.~S. and
{Siegel}, M. and {Spencer}, M. and {Starkey}, D. and {Sung}, H.-I. and
{Teems}, K.~G. and {Treu}, T. and {Turner}, C.~S. and {Uttley}, P. and
{Villforth}, C. and {Weiss}, Y. and {Woo}, J.-H. and {Yan}, H. and
{Young}, S.},
title = "{McGraw-Hill Dictionary of Scientific & Technical Terms}",
journal = {ApJ},
archivePrefix = "arXiv",
eprint = {1510.05648},
keywords = {galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert},
year = 2016,
month = apr,
volume = 821,
eid = {56},
pages = {56},
doi = {10.3847/0004-637X/821/1/56},
adsurl = {http://adsabs.harvard.edu/abs/2016ApJ...821...56F},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2016Natur.535..388K,
author = {{Kara}, E. and {Miller}, J.~M. and {Reynolds}, C. and {Dai}, L.
},
title = "{Relativistic reverberation in the accretion flow of a tidal disruption event}",
journal = {\nat},
archivePrefix = "arXiv",
eprint = {1606.06736},
primaryClass = "astro-ph.HE",
year = 2016,
month = jul,
volume = 535,
pages = {388-390},
doi = {10.1038/nature18007},
adsurl = {http://adsabs.harvard.edu/abs/2016Natur.535..388K},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2007MNRAS.380..669C,
author = {{Cackett}, E.~M. and {Horne}, K. and {Winkler}, H.},
title = "{Testing thermal reprocessing in active galactic nuclei accretion discs}",
journal = {MNRAS},
archivePrefix = "arXiv",
eprint = {0706.1464},
keywords = {galaxies: active, galaxies: nuclei, galaxies: Seyfert},
year = 2007,
month = sep,
volume = 380,
pages = {669-682},
doi = {10.1111/j.1365-2966.2007.12098.x},
adsurl = {http://adsabs.harvard.edu/abs/2007MNRAS.380..669C},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2014A&ARv..22...72U,
author = {{Uttley}, P. and {Cackett}, E.~M. and {Fabian}, A.~C. and {Kara}, E. and
{Wilkins}, D.~R.},
title = "{X-ray reverberation around accreting black holes}",
journal = {A\&ARv},
archivePrefix = "arXiv",
eprint = {1405.6575},
primaryClass = "astro-ph.HE",
keywords = {Accretion, accretion disks, Black hole physics, Galaxies: active, Galaxies: Seyfert, X-rays: binaries},
year = 2014,
month = aug,
volume = 22,
eid = {72},
pages = {72},
doi = {10.1007/s00159-014-0072-0},
adsurl = {http://adsabs.harvard.edu/abs/2014A%26ARv..22...72U},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2013ApJ...777...24Z,
author = {{Zoghbi}, A. and {Reynolds}, C. and {Cackett}, E.~M.},
title = "{Calculating Time Lags from Unevenly Sampled Light Curves}",
journal = {ApJ},
archivePrefix = "arXiv",
eprint = {1308.5852},
primaryClass = "astro-ph.HE",
keywords = {black hole physics, galaxies: active, galaxies: nuclei, methods: data analysis },
year = 2013,
month = nov,
volume = 777,
eid = {24},
pages = {24},
doi = {10.1088/0004-637X/777/1/24},
adsurl = {http://adsabs.harvard.edu/abs/2013ApJ...777...24Z},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2015ApJ...806..129E,
author = {{Edelson}, R. and {Gelbord}, J.~M. and {Horne}, K. and {McHardy}, I.~M. and
{Peterson}, B.~M. and {Ar{\'e}valo}, P. and {Breeveld}, A.~A. and
{De Rosa}, G. and {Evans}, P.~A. and {Goad}, M.~R. and {Kriss}, G.~A. and
{Brandt}, W.~N. and {Gehrels}, N. and {Grupe}, D. and {Kennea}, J.~A. and
{Kochanek}, C.~S. and {Nousek}, J.~A. and {Papadakis}, I. and
{Siegel}, M. and {Starkey}, D. and {Uttley}, P. and {Vaughan}, S. and
{Young}, S. and {Barth}, A.~J. and {Bentz}, M.~C. and {Brewer}, B.~J. and
{Crenshaw}, D.~M. and {Dalla Bont{\`a}}, E. and {De Lorenzo-C{\'a}ceres}, A. and
{Denney}, K.~D. and {Dietrich}, M. and {Ely}, J. and {Fausnaugh}, M.~M. and
{Grier}, C.~J. and {Hall}, P.~B. and {Kaastra}, J. and {Kelly}, B.~C. and
{Korista}, K.~T. and {Lira}, P. and {Mathur}, S. and {Netzer}, H. and
{Pancoast}, A. and {Pei}, L. and {Pogge}, R.~W. and {Schimoia}, J.~S. and
{Treu}, T. and {Vestergaard}, M. and {Villforth}, C. and {Yan}, H. and
{Zu}, Y.},
title = "{Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548}",
journal = {\apj},
archivePrefix = "arXiv",
eprint = {1501.05951},
keywords = {galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert},
year = 2015,
month = jun,
volume = 806,
eid = {129},
pages = {129},
doi = {10.1088/0004-637X/806/1/129},
adsurl = {http://adsabs.harvard.edu/abs/2015ApJ...806..129E},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2015ApJ...806..128D,
author = {{De Rosa}, G. and {Peterson}, B.~M. and {Ely}, J. and {Kriss}, G.~A. and
{Crenshaw}, D.~M. and {Horne}, K. and {Korista}, K.~T. and {Netzer}, H. and
{Pogge}, R.~W. and {Ar{\'e}valo}, P. and {Barth}, A.~J. and
{Bentz}, M.~C. and {Brandt}, W.~N. and {Breeveld}, A.~A. and
{Brewer}, B.~J. and {Dalla Bont{\`a}}, E. and {De Lorenzo-C{\'a}ceres}, A. and
{Denney}, K.~D. and {Dietrich}, M. and {Edelson}, R. and {Evans}, P.~A. and
{Fausnaugh}, M.~M. and {Gehrels}, N. and {Gelbord}, J.~M. and
{Goad}, M.~R. and {Grier}, C.~J. and {Grupe}, D. and {Hall}, P.~B. and
{Kaastra}, J. and {Kelly}, B.~C. and {Kennea}, J.~A. and {Kochanek}, C.~S. and
{Lira}, P. and {Mathur}, S. and {McHardy}, I.~M. and {Nousek}, J.~A. and
{Pancoast}, A. and {Papadakis}, I. and {Pei}, L. and {Schimoia}, J.~S. and
{Siegel}, M. and {Starkey}, D. and {Treu}, T. and {Uttley}, P. and
{Vaughan}, S. and {Vestergaard}, M. and {Villforth}, C. and
{Yan}, H. and {Young}, S. and {Zu}, Y.},
title = "{Space Telescope and Optical Reverberation Mapping Project.I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope}",
journal = {\apj},
archivePrefix = "arXiv",
eprint = {1501.05954},
keywords = {galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert},
year = 2015,
month = jun,
volume = 806,
eid = {128},
pages = {128},
doi = {10.1088/0004-637X/806/1/128},
adsurl = {http://adsabs.harvard.edu/abs/2015ApJ...806..128D},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{1999MNRAS.302L..24C,
author = {{Collier}, S. and {Horne}, K. and {Wanders}, I. and {Peterson}, B.~M.
},
title = "{A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies}",
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eprint = {astro-ph/9811278},
year = 1999,
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volume = 302,
pages = {L24-L28},
doi = {10.1046/j.1365-8711.1999.02250.x},
adsurl = {http://adsabs.harvard.edu/abs/1999MNRAS.302L..24C},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2016MNRAS.462..511K,
author = {{Kara}, E. and {Alston}, W.~N. and {Fabian}, A.~C. and {Cackett}, E.~M. and
{Uttley}, P. and {Reynolds}, C.~S. and {Zoghbi}, A.},
title = "{A global look at X-ray time lags in Seyfert galaxies}",
journal = {\mnras},
keywords = {black hole physics, galaxies: active, X-rays: galaxies},
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pages = {511-531},
doi = {10.1093/mnras/stw1695},
adsurl = {http://adsabs.harvard.edu/abs/2016MNRAS.462..511K},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@INPROCEEDINGS{2006pces.conf...89P,
author = {{Peterson}, B.~M. and {Horne}, K.},
title = "{Reverberation mapping of active galactic nuclei}",
booktitle = {Planets to Cosmology: Essential Science in the Final Years of the Hubble Space Telescope},
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editor = {{Livio}, M. and {Casertano}, S.},
month = jan,
pages = {89},
adsurl = {http://adsabs.harvard.edu/abs/2006pces.conf...89P},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2012ARA&A..50..455F,
author = {{Fabian}, A.~C.},
title = "{Observational Evidence of Active Galactic Nuclei Feedback}",
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pages = {455-489},
doi = {10.1146/annurev-astro-081811-125521},
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}
@ARTICLE{2015PASP..127...67B,
author = {{Bentz}, M.~C. and {Katz}, S.},
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}
@ARTICLE{2014SSRv..183..253P,
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}
@ARTICLE{1973A&A....24..337S,
author = {{Shakura}, N.~I. and {Sunyaev}, R.~A.},
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}

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chaos/CFJChaos/Licence.txt Executable file
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READ THE TERMS OF THIS AGREEMENT CAREFULLY BEFORE USING THE SOFTWARE. BY
USING THE SOFTWARE, YOU AGREE TO THE TERMS OF THIS AGREEMENT. IF YOU DO
NOT AGREE TO ALL THE TERMS, YOU ARE NOT AUTHORIZED TO DOWNLOAD OR USE THE
SOFTWARE IN ANY MANNER.
1. LICENCE TO USE. You are granted a non-exclusive licence, for
non-commercial use only, of the accompanying Software (Chaos for Java).
2. RESTRICTIONS. The Software is confidential and copyright. Title to the
Software and all associated intellectual property rights is retained by
the author. Copyright ©1999-2003 Brian Davies.
3. MODIFICATION. Unless enforcement is prohibited by applicable law, or as
permitted under clause 6 of the LGPL licence in respect of LGPL libraries,
you may not modify, decompile, or reverse engineer the Software.
4. REDISTRIBUTION. You are granted permission to redistribute the software
under this licence, provided that it is complete and accompanied by this
Licence Agreement and all other associated documentation and licences.
5. INSTALLATION SCRIPTS. If the Software is provided with installation
scripts, then permission is granted to modify those scripts to allow the
Software to be installed on a particular computer or class of computers.
Permission is also granted to redistribute such modified scripts, provided
that all changes are documented.
6. DISCLAIMER OF WARRANTY. The Software is provided "AS IS", with no
warranty of any kind, including the warranty of design, merchantability
and fitness for a particular purpose.
7. INTERPRETATION. This Licence Agreement shall be governed by the laws
of the Australian Capital Territory excluding those provisions related to
conflict of laws.
8. TERMINATION. This Agreement is effective until terminated by you. You
may terminate this Agreement at any time by destroying all copies of the
Software.
-------------------------------------------------------

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chaos/CFJChaos/ReadMe.txt Executable file
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CHAOS FOR JAVA - APPLICATION VERSION.
The software is free for non commercial use without explicit permission
from the author. Before downloading or using it it you must read and agree
to the licence agreement. All other rights reserved.
Copyright ©1999-2003 Brian Davies.
IMPORTANT NOTICE:
Application Version 1.2.2 has no expiry date, but you should visit the website
http://sunsite.anu.edu.au/education/chaos
for information on later versions.
FEATURES:
Features of Application Version, beyond those of the Applet Version
documented in my book "Exploring Chaos: theory and experiment", are
briefly summarised as:
1. After startup there is a window which has menus and buttons. In the
MacOS9 version the window may be hidden using the close box (which does
not actually close it), in other versions it may be minimized once some
other window(s) are open, since all windows carry menus (for the MacOS X
version, menus are at the top of the screen and always present).
2. Documents may be saved and then re-opened. You will be prompted
automatically about saving. Note that no computational or graphical
information is saved, only the parameter and window settings necessary
for exact reconstruction.
3. Pictures/Graphs may be saved in the following cross platform formats:
(i) GIF - the compression algorithm is subject to patent and you assume
responsibility for any use you make of the output. This format may
be omitted from future versions.
(ii) JPEG - the compression is not lossless but the quality setting is
high, so the files will be quite large. In most circumstances this
will not be the appropriate format to use.
(iii) PNG - this format was introduced (in part) to circumvent the use
of patented algorithms. There is increasing support for PNG format
in Browsers and Word Processors. The files will be small - probably
smaller than the GIF output.
4. Printing is possible, using the rudimentary printing features of Java 1.1.
Because of these limitations, printing is not particularly good. Device and
resolution independence are supported in Java 1.2 (aka Java 2) and I expect
to move to this when time permits.
5. Preferences may be saved and re-loaded, ie, all choices available via
the Preferences menu. You will be prompted automatically about saving if
needed. Note that preferences are application wide, ie, fonts apply to all
windows, colours to all windows of that type, ie, Bifurcation Diagrams
have distinct colour settings from Fourier Analysis, and so on.
BUG REPORTS:
Bug reports may be sent to
Brian.Davies@anu.edu.au
but it is essential to quote all the information in the startup panel, ie
(i) the platform and operating system - displayed top left,
(ii) the virtual machine information - displayed top right,
(iii) the Chaos for Java version - displayed bottom.
VERSION HISTORY:
Version 1.0 - June 30, 1999. Original version released for use with book.
Version 1.0.1 - August 2, 1999. Resolves an incompatibility with
Internet Explorer 5 for Windows.
Version 1.0.2 - September 22, 1999. Minor bug fixes.
Version 1.0.3 - October 1, 1999. Minor changes to allow application
versions.
Version 1.0.4 - November 1, 1999. Enhancement (animation) of "Graphical
Analysis".
Version 1.0.5 - January 7, 2000. Minor bug fixes.
Version 1.1 - January 28, 2000. First application version.
Version 1.1 - March 1, 2000. Common applet/application version.
Version 1.1.1 - May 5, 2000. Save as png (portable network graphics)
format. 8th order Runge-Kutta integration of ODEs. Enhancements
of application version user interface.
Version 1.1.2 - November 1, 2000. Minor bug fixes. Enhancements of user
interface and application preferences. Iterate(1d) has animation and
includes 2d maps. Return maps include 1d maps. Saved files not all
compatible with previous versions.
Version 1.1.3 - April 24, 2001.
(i) Major enhancement of Iterate(2d) to allow investigation of fixed
points of two dimensional maps and compositions. The zero-curves of
x - f(x,y) and y - g(x,y) may be viewed in the x-y plane, accurate positions
and eigenvalues of fixed points may also be obtained.
(ii) ODEs: the two-well oscillator [f(x) = x(1-x^2)] and Duffing oscillator
[f(x) = -x(1+x^2)] are included.
(iii) File format: version 1.1.3 will read and convert files saved from
version 1.1.2 but the new file format is incompatible with earlier ones.
(iv) Minor bug fixes and user interface enhancements.
Version 1.1.4 - October 22, 2001.
(i) Minor bug fixes and enhancements.
(ii) Version 1.1.4 will read and convert files saved from versions 1.1.2
and 1.1.3 but the new file format is incompatible with earlier ones.
Version 1.1.5 - June 1, 2002.
(i) Minor bug fixes.
(ii) Some features not documented in "Exploring Chaos: Theory and Experiment"
temporarily removed.
Version 1.2 - June 2, 2003.
(i) Complete refactorisation of all code.
(ii) Numerous interface improvements.
(iii) Choice of display modes.
(iv) Dual orbits for PoincarŽ sections.
(v) Fixed points and stability analysis for compositions of two-dimensional
maps and PoincarŽ sections.
(vi) Graphical visualisation of bifurcations of two-dimensional maps and
PoincarŽ sections.
(vii) Basins of attraction for PoincarŽ sections.
(viii) Bifurcation diagrams of stable and unstable orbits for two-dimensional maps.
(ix) Better estimates of accuracy of fixed points of two-dimensional systems.
(x) Variational equations used for Lyapunov exponents of PoincarŽ sections.
Version 1.2.1 - Septembeer 30, 2003.
(i) Minor big fixes.
(ii) Improved algorithm for one-dimensional bifurcation diagrams (periodic orbits).
(iii) MacOSX version has "aqua" appearance and Java 2 printing.
Version 1.2.2 - November 30, 2003.
(i) Java 2 printing for all platforms.
(ii) Improvements to the graphical user interface.
(iii) Minor bug fixes.
ACKNOWLEDGEMENTS
Development of this software has been assisted by support from the
Australian Apple University Consortium,
http://auc.uow.edu.au/
an international cooperative program between Apple Computer and Australian
Universities. One of its aims is to develop educational software for the
Macintosh environment.
The Gif Encoder is Copyright (1996) by Jef Poskanzer (jef@acme.com).
The Jpeg Encoder is Copyright (1998) by James R. Weeks and BioElectroMech
(James@obrador.com).
The Png Encoder is Copyright (2000) by J. David Eisenberg
(david@catcode.com) (GNU Lesser General Public License).
-----------------------------------------------------------------------

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Copyright (C) 1996 by Jef Poskanzer <jef@acme.com>. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR WISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
Visit the ACME Labs Java page for up-to-date versions of this and
fine Java utilities: http://www.acme.com/java/

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The JpegEncoder and its associated classes are Copyright (c) 1998, James R.
Weeks and BioElectroMech. This software is based in part on the work of the
Independent JPEG Group.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
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disclaimer.
2. Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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That's all there is to it!

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Quasars and the Birth & Evolution of Galaxies
It was on February 5, 1963 (just 8 days before my birth) that astronomer
Maarten Schmidt ran through the hallways of Caltech announcing that
he had discovered the high redshift nature of quasars, then known only
as mysterious points of light recently identified in radio surveys. In
the interim period our understanding of their place in the universe has
gone from that of isolated, ultraluminous freaks of nature to crucial
links in the birth and evolution of massive galaxies. I will present an
overview of these very recent and dramatic developments.

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%
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%
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% http://journals.aas.org/authors/aastex.html
% ftp://ftp.edpsciences.org/pub/aa/readme.html
% For more information about ADS abstract server, please see:
% http://adsabs.harvard.edu/ads_abstracts.html
%
% Abbreviations for journals. The object here is to provide authors
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% Bulletin of the Astronomical Institutes of Czechoslovakia
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% Chinese Astronomy and Astrophysics
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% Chinese Journal of Astronomy and Astrophysics
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% Revista Mexicana de Astronomia y Astrofisica
\def\qjras{\ref@jnl{QJRAS}} % Quarterly Journal of the RAS
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\def\solphys{\ref@jnl{Sol.~Phys.}} % Solar Physics
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@proceedings{proceedings,
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{ahu61,
author={Arrow, Kenneth J. and Leonid Hurwicz and Hirofumi Uzawa
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title={Constraint qualifications in maximization problems
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journal=
{Naval Research Logistics Quarterly},
volume={8},
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pages={175-191
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@book{ab94,
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*A book must have either an author field or an editor field.
@incollection{m85,
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title={The theory of implementation in {N}ash
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editor={Leonid Hurwicz and David Schmeidler and Hugo Sonnenschein},
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@unpublished{FudenbergKreps1988,
title = {A theory of learning, experimentation, and equilibrium in games},
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\documentclass[11pt,letterpaper]{article}
%\usepackage{aas_macros}
\usepackage{biblatex}
\usepackage{graphicx}
\usepackage[margin=1.in,centering]{geometry}
\usepackage{hyperref}
\usepackage{caption}
\usepackage[export]{adjustbox}
\usepackage{float}
\usepackage{gensymb}
\bibliography{/home/caes/wmu/phy-4660/adv_lab.bib}
\begin{document}
\newcommand{\FpaO}{$^{19}\textrm{F(p,}\alpha)^{16}\textrm{O}$}
\newcommand{\LipaHe}{$^7\textrm{Li(p,}\alpha)^4\textrm{He}$}
%\newcommand{}$^7\textrm{Li(p,}\alpha)^4\textrm{He}$ reaction.\\
\title{The Role of Active Galactic Nuclei in Galactic Evolution and Cosmology}
\author{Otho Ulrich}
\maketitle
\begin{abstract}
AGN Feedback\end{abstract}
%─────────────
\section{Introduction}
\label{sec:intro}
Bragg diffraction of X-rays is a useful method for characterising the atomic and molecular structure of materials. Many mechanical and electric properties are functions of the atomic structures that constitute materials. Bragg diffraction uses the wave theory of electromagnetic radiation to predict how x-rays will interact with the atomic lattice of a crystal. The spacing between atoms can be measured by inference, and these spacings are called the lattice constants.\\
We attempt to compute the lattice constant from an x-ray diffractometer reading of a sample of NaCl, or common salt. NaCl forms a cubic crystal structure, so it has a single lattice constant. This will be computed from the diffraction pattern and compared to known values. Three amorphous samples will also be analyzed: plastic of an unknown type; grease; and wood. These materials are not expected to have rigid crystal structures, but the average spacing between atoms can be ascertained from the diffraction pattern. These materials are made of mostly carbon, with some hydrogen and oxygen. We therefore expect their densities to be nearly that of amorphous carbon.\\
\section{Bragg Diffraction}
\label{subsec:bragg}
The diffraction angle of x-rays by atoms in a crystal lattice or other molecule depends on the distance between atoms. The lattice constants of a crystal describe the distances and angles between atoms, but in the case of a cubic lattice such as NaCl, there is only one relevant lattice constant. Bragg diffraction predicts strong x-ray signals at diffraction angles that produce constructive interference. Figure~\ref{fig:bragg} illustrates the geometry of Bragg diffraction; the distance between planes d is the lattice constant, and the Bragg condition
\begin{equation}
\centering 2d\sin \theta = n\lambda,
\end{equation}
where $\lambda$ is the photon wavelength of the X-ray and $n$ a positive integer describes the angles at which strong signals should be detected. \cite{advlabxrd} \\
\begin{figure}
\center
\includegraphics[width=3in]{braggdiffraction.png}
\caption{Bragg diffraction from a cubic crystal lattice. Plane waves incident on a crystal lattice at angle $\theta$ are partially reflected by successive parallel crystal planes of spacing d. The superposed reflected waves interfere constructively if the Bragg condition $2d\sin \theta =n\lambda$ is satisfied. \cite{braggdiff_wiki}}
\label{fig:bragg}
\end{figure}
The modern approach to analyzing materials by Bragg diffraction is to interpret the output as the reciprocal space representation of the lattice positions. An inverse Fourier transform then gives the positions that make the lattice. The HighScore Plus software, associated with the Empyrean XRD, is used to perform these operations. \cite{highscore}\\
A crystal powder sample will have random orientations across all possible rotations in 3 dimensions; we call this powder diffraction. In a cubic crystal the Miller indices ($h~k~l$) describe the orientation of the planes, predicting periodic lattice points along the z-axis that will produce constructive interference. While the lattice constant does not change, each orientation may result in a different diffraction spacing, so a powder diffraction will result in a diffraction pattern where signals are observed at many angles; observe Figure~\ref{fig:miller}. The lattice constant can be computed in each case.\\
%─────────────
\section{Material Structure}
\label{subsec:nacl}
The structure of some samples tested here are known. NaCl is a face-centered cubic lattice with lattice constant $a = 564.02 \textrm{pm}$. \cite{naclwiki} This closely agrees with the value reported by Wallace and Barrett: $a = 5.64 \pm 0.0005 \textrm{\AA}$. \cite{10.1021/ja01631a014} The allowed miller indices for a FCC lattice are given in Table~\ref{tab:cubicstructure}, with the computed diffraction spacing, and some of the geometries are shown in Figure~\ref{fig:miller}. \\
\begin{table}
\centering
\begin{tabular}{llllll}
h & k & l & Spacing () & $2\theta (\degree)$ & Reflected Int. (\%) \\
\hline
1 & 1 & 1 & 3.26 & 27.367 & 8.7 \\
0 & 0 & 2 & 2.82 & 31.704 & 100 \\
0 & 2 & 2 & 1.99 & 45.449 & 64.3 \\
1 & 1 & 3 & 1.70 & 53.87 & 2.2 \\
2 & 2 & 2 & 1.63 & 56.474 & 20.2 \\
0 & 0 & 4 & 1.41 & 66.229 & 8.7 \\
1 & 3 & 3 & 1.29 & 73.072 & 1 \\
0 & 2 & 4 & 1.26 & 75.294 & 22.5 \\
2 & 2 & 4 & 1.15 & 83.994 & 16.2 \\
\end{tabular}
\caption{Allowed Miller indices ($h~k~l$) for NaCl. For each, the predicted diffraction spacing along the axis normal to the sample surface is predicted, and the incidence angle with its expected reflected intensity. \cite{10.1021/ja01631a014} \cite{highscore}}
\label{tab:cubicstructure}
\end{table}
\begin{figure}[]
[A]\includegraphics[width=1.4in]{FCC_002.pdf}
[B]\includegraphics[width=1.4in]{FCC_111.pdf}
[C]\includegraphics[width=1.4in]{FCC_022.pdf}
[D]\includegraphics[width=1.4in]{FCC_133.pdf}
\caption{Four of the atomic plane orientations of a face-centered cubic lattice that result in Bragg diffraction. The Miller indices ($h~k~l$) for each structure are [A] (0 0 2) [B] (1 1 1) [C] (0 2 2) [D] (1 3 3). The predicted diffraction spacings are tabulated in Table~\ref{tab:cubicstructure}}
\label{fig:miller}
\end{figure}
Amorphous materials consisting of mostly carbon have complex structures. Therefore, they are difficult to analyze in detail. \cite{C3CS60279F} The diffraction pattern peak should reach a maximum at the angle $\theta$ corresponding to the average distance between atoms, and lesser peaks can be expected as indicators of other prominent structures within a sample. These values will be determined and a density computed from the average distance between atoms. \cite{advlabxrd} \\
\begin{table}
\centering
\begin{tabular}{rlllll}
Mat. & Packing Frac. & Density (g/cm$^3$) & Atomic Mass (g) & MAC (cm$^2$/g) & Pen. Depth ($\mu \textrm{m}$) \\
\hline
NaCl & 0.7 & 2.165 & - & 73.7 & 206 \\
Carbon & 0.6 & 2.0 & $1.99442\times10^{-23}$ & 4.3 & 4460 \\
\end{tabular}
\caption{Properties of interest for the materials analyzed in this study. Values for the amorphous materials are assumed to be those of amorphous carbon. Packing fractions are rough estimates. The mass attenuation coefficients are taken from the NIST Hubbell and Seltzer database, and used by HighScore Plus to compute the penetration depth. Densities and atomic mass are as reported on Wikipedia, April 17, 2017. \cite{MACNIST} \cite{naclwiki} \cite{carbonwiki}}
\label{tab:properties}
\end{table}
\subsection{Penetration Depth}
\label{subsec:pendepth}
The penetration depth of Cu K-$\alpha_1$ is computed for each material. This is the depth in a material by which 98\% of the photons at this energy will have attentuated. The defining formula
\begin{equation}
I_L = I_0 \times e^{-(\frac{\mu}{\rho}\rho L)}
\end{equation}
is valid for symmetric (gonio) scans. \cite{highscore} The HighScore Plus software computes the penetration depth from the mass attentuation coefficient, specific gravity of the material, and a powder packing fraction. These values are tabulated in Table~\ref{tab:properties} along with the computed penetration depths. Penetration depth is computed for an incidence angle 90\degree, which gives maximum penetration. \\
%─────────────
\section{X-ray Diffractometer}
\label{subsec:diffrator}
An Empyrean x-ray diffractometer by PANalytical \cite{empyrean} was used to collect a diffraction pattern from each sample. In this machine, an x-ray source emits onto a material sample, and a detector records x-rays diffracted at the angle of incidence; see Figure~\ref{fig:diffractometer}. X-rays are created by accelerating electrons toward a copper anode (Figure~\ref{fig:xraysource}). The X'Celerator detector is an x-ray sensor consisting of 127 single-file barrier detectors with copper K-$\alpha$ efficiency $>94\%$ \cite{xcelerator}.\\
The sample container depth was not measured during the experiment -- a major oversight. A best guess for the sample tray depth is $1.5\pm.3$ cm. If the penetration depth of a material exceeds this distance, diffraction from the container may be observed, contaminating the results.
\begin{figure}
\center
\includegraphics[width=3in]{empyrean_sample.jpg}
\includegraphics[width=3in]{empyrean_scanners.pdf}
\caption{The PANalytical Empyrean x-ray diffractometer. A sample is placed in a bin at the center. X-rays are generated in the arm on the left, diffracted at an incidence angle $\theta$ by the sample at the center, and detected at a reflected angle $\theta$ by the X'Celerator in the arm on the right. Each scan runs through $\theta = \{5\degree .. 45\degree\}$.}
\label{fig:diffractometer}
\end{figure}
\begin{figure}
\center
[A]\includegraphics[width=3in]{xraytube.png}
[B]\includegraphics[width=3in]{Copper_K_Rontgen.png}
\caption{[A] X-rays are generated when collisions with accelerated electrons knock electrons in the copper atoms of the anode out of the K shell. When the electrons fall back to the K shell, x-rays are emitted with energies indicated in [B]. These energy values are important for predicting the x-ray diffraction pattern from Bragg diffraction. \cite{advlabxrd} \cite{xraytubephoto}}
\label{fig:xraysource}
\end{figure}
\begin{table}
\centering
\begin{tabular}{cccc}
Copper Emission & Energy (eV) & Frequency (Hz) & Wavelength ($\textrm{\AA}$)\\
\hline
K-$\alpha_1$ & 8046 & 1.946$\times 10^{18}$ & 1.541\\
K-$\alpha_2$ & 8027 & 1.941$\times 10^{18}$ & 1.393\\
K-$\beta$ & 8903 & 2.153$\times 10^{18}$ & 1.545\\
\end{tabular}
\caption{Copper K-$\alpha$ and K-$\beta$ x-ray photon properties. The K-$\alpha_1$ is the primary driver of x-ray diffraction in this study, but the other x-rays are also present in smaller numbers.}
\label{tab:kalpha}
\end{table}
\subsection{Computational Details}
\label{sec:compdets}
The phases of the x-rays cannot be measured, so the HighScore Plus software from PANalytical determines the phase by fitting predicted profiles. To identify the NaCl pattern, a background is determined using the minimum 2nd derivative method with ``bending factor'' = 5, ``granularity'' = 20, and using smoothed input data. Peaks are located with ``minimum significant'' = 10.00, ``minimum tip width'' = 0.01, ``maximum tip width'' = 1.00, and ``peak base width'' = 2.00. \cite{highscore}.\\
The lattice constant $a$ is computed by
\begin{equation}
a = \textrm{diffraction spacing}\times\sqrt{h^2 + k^2 + l^2}.
\end{equation}
For the amorphous samples, peaks are identified by hand to within a standard error of $\pm0.05\degree$. We use the copper K-$\alpha$ wavelength from table \ref{tab:kalpha}: $\lambda = 1.541\times10^{-10} \textrm{\AA}$. The spacing is calculated as
\begin{equation}
d/n = \lambda / \left(2\sin\theta\right)
\end{equation}
with n = 1. Using the atomic mass and packing fraction from Table~\ref{tab:properties} allows the density $\rho$ to be computed as
\begin{equation}
\rho = \frac{\textrm{atomic mass}}{\textrm{unit cell volume}\times\textrm{packing fraction}}
\end{equation}
where the unit cell is assumed to be face-centered cubic with side length equal to the computed average distance.
%─────────────
\section{Results}
\label{sec:results}
\begin{figure}
\centering
[A]\includegraphics[width=6.5in]{nacl_bumps.pdf}
[B]\includegraphics[width=6.5in]{nacl_compare_bumps.pdf}
\caption{[A] HighScore Plus identified the characteristic NaCl diffraction pattern from Cu K-$\alpha$ emission, and this is used to fit the phase and in turn determine the lattice constant. [B] At the most prominent peak, the detector measurements (red) strongly correlate with the computed diffraction lines (blue).}
\label{fig:nacldiffraction}
\end{figure}
\begin{table}
\centering
\begin{tabular}{llrlllc}
2$\theta$ (\degree) & Spacing ($\textrm{\AA}$) & Refl. Int. (\%) & h & k & l & Lattice Const. ($\textrm{\AA}$)\\
\hline
27.369~(0.000)&3.2588~(0.000)&2.32~(0.73)
&1&1&1&5.64$\pm0.35$\\
31.638~(0.002)&2.8258~(0.002)&100 ~(0.00)
&0&0&2&5.65$\pm0.40$\\
45.385~(0.001)&1.9967~(0.004)&16.75~(0.74)
&0&2&2&5.65$\pm0.56$\\
53.873~(0.000)&1.7004~(0.000)&0.58~(0.74)
&1&1&3&5.64$\pm0.66$\\
56.430~(0.000)&1.6293~(0.000)&4.36~(0.78)
&2&2&2&5.64$\pm0.69$\\
66.180~(0.000)&1.4109~(0.000)&8.96~(0.03)
&0&0&4&5.64$\pm0.80$\\
75.291~(0.000)&1.2612~(0.000)&5.54~(0.75)
&0&2&4&5.64$\pm0.89$\\
83.949~(0.000)&1.1518~(0.002)&2.42~(0.85)
&2&2&4&5.64$\pm0.98$\\
\end{tabular}
\caption{Observed peaks from the NaCl sample. Diffraction spacings and the reflected intensity ratios are computed for each. The Miller indices are determined by matching angular position with Table~\ref{tab:cubicstructure}. In parentheses is the ratio difference from predicted values in that table. These values are best matches reported by the HighScore software, but uncertainties were not reported. An inspection by eye gives approximately $\pm0.05\degree$ for 98\% confidence in the observed angle $2\theta$, and the computed standard error for the diffraction spacing is $\pm 0.20 \textrm{\AA}$.}
\label{tab:naclobs}
\end{table}
\begin{figure}[]
[A] \includegraphics[width=1.9in]{plastic_peaks.pdf}
[B] \includegraphics[width=1.9in]{grease_peaks.pdf}
[C] \includegraphics[width=1.9in]{wood_peaks.pdf}
\caption{Diffraction curves observed from the three amorphous samples, presented on log scales: [A] unknown plastic; [B] grease; [C] wood. The largest peak should correspond to the average distance between atoms. Secondary peaks may indicate a secondary structure. An interpretation is attempted in Section~\ref{sec:conclusion}.}
\label{fig:amorphous_peaks}
\end{figure}
\begin{table}
\centering
\begin{tabular}{lrrrl}
Sample & 2$\theta \pm 0.5$ ($\degree$) & Spacing ($\textrm{\AA}$) & Density (g/cm$^3$) & Ratio (2g/cm$^3$)\\
\hline
Plastic*&14.0&$6.32\pm0.45$&$0.136\pm0.029$&$0.07\pm0.02$\\
Plastic &30.5&$2.93\pm0.09$&$0.549\pm0.038$&$0.27\pm0.04$\\
Plastic &42.5&$2.13\pm0.05$&$3.451\pm0.243$&$1.73\pm0.24$\\
Grease* &12.0&$7.37\pm0.62$&$0.087\pm0.021$&$0.04\pm0.02$\\
Grease &20.0&$4.44\pm0.22$&$0.385\pm0.057$&$0.19\pm0.06$\\
Wood &16.0&$5.54\pm0.35$&$0.200\pm0.038$&$0.10\pm0.04$\\
Wood* &22.5&$3.95\pm0.17$&$0.545\pm0.070$&$0.20\pm0.07$\\
Wood &34.5&$2.60\pm0.07$&$1.899\pm0.153$&$0.95\pm0.15$\\
Wood &46.0&$1.97\pm0.04$&$4.359\pm0.265$&$2.18\pm0.27$\\
\end{tabular}
\caption{Observed peaks in diffraction pattern in amorphous samples. * indicates greatest peak, likely the peak associated with the average spacing between atoms. The ratio relative to the known carbon density 2.0 g/cm$^3$ is also tabulated.}
\label{tab:amorph_spacings}
\end{table}
The penetration depths of NaCl and amorphous carbon are 206 $\mu \textrm{m}$ and 4,460 $\mu \textrm{m}$, respectively. 98\% of all photons will have attentuated at this depth in the material.
The observed diffraction pattern from NaCl is presented in Figure~\ref{fig:nacldiffraction}. The HighScore software was able to identify the copper Bragg diffraction pattern, which was prominent by inspection. Table~\ref{tab:naclobs} contains the values obtained by the program, with divergence from predicted values. The lattice constant for NaCl's face-centered cubic structure is computed from each value, all returning approximately 5.64, with relative error between 7\% and 18\%.
Several peaks were identified for each amorphous sample. In each case, a spacing was determined and a density computed. These are reported in Table~\ref{tab:amorph_spacings}. The densities ran from 0.087 to 4.359 g/cm$^3$, which is a run of about 1.5 orders of magnitude. The median value is 2.22 g/cm$^3$.
%─────────────
\section{Conclusion}
\label{sec:conclusion}
The penetration depths fall short of the 1.2 cm limit imposed by the sample container tray depth, so we do not expect that there are significant signals observed from the sample container over these collections. Signals observed may therefore reliably be considered emergent from Bragg diffraction by the samples.
The diffraction pattern of NaCl was easily and clearly identified by the HighScore Plus program. The angles of incidence and reflection deviate from predictions only in the fourth order of precision or less, as do the diffraction spacings. The reflection intensities, however, deviate by a large amount from predictions: many showing approximately $\frac{1}{4}$ the predicted intensity. It's suspicious that each of these errors falls within a small range around $\frac{1}{4}$, and this may indicate a computational error rather than an experimental one.
The lattice constant for NaCl was computed in each case, and all agree to within 3 orders of precision with the known lattice constant 5.64 $\textrm{\AA}$. This method of measuring the lattice constant appears to be very reliable.
The amorphous samples present several peaks from which to compute an average diffraction spacing. Only one of the computed densities falls precisely around the density of amorphous carbon (wood, 46.0$\degree$). Considering a cubic structure using the average distance is a rudimentary approach, and the fact that computed densities are all within 1.5 orders of magnitude of carbon's density is remarkable. It should also be noted that the median value across all of these densities is 2.22 g/cm$^3$, which only differs from carbon by about 10\%. It may be reasonable to consider that each of these peaks indicates a prominent component to the structure, so taking them all into account provides a better estimation of the density.
\printbibliography
\end{document}

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