Purdue e-Pubs | Purdue University Scholarship Online

<!DOCTYPE html> <html lang="en"> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("http://docs.lib.purdue.edu/","20130704143454","https://web.archive.org/","web","/_static/", "1372948494"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" />  <script type="text/javascript" src="https://web.archive.org/web/20130704143454js_/http://yui.yahooapis.com/3.6.0/build/yui/yui-min.js"></script>  <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title> Purdue e-Pubs | Purdue University Scholarship Online </title>  <meta name="viewport" content="width=device-width">  <meta name="viewport" content="width=device-width">  <link rel="stylesheet" href="/web/20130704143454cs_/http://docs.lib.purdue.edu/ir-style.css" type="text/css" media="screen"> <link rel="stylesheet" href="/web/20130704143454cs_/http://docs.lib.purdue.edu/ir-custom.css" type="text/css" media="screen"> <link rel="stylesheet" href="/web/20130704143454cs_/http://docs.lib.purdue.edu/ir-local.css" type="text/css" media="screen"> <link rel="stylesheet" href="/web/20130704143454cs_/http://docs.lib.purdue.edu/ir-print.css" type="text/css" media="print"> <link rel="alternate" type="application/rss+xml" title="Purdue e-Pubs Feed" href="/web/20130704143454/http://docs.lib.purdue.edu/recent.rss"> <script type="text/javascript" src="/web/20130704143454js_/http://docs.lib.purdue.edu/assets/footnoteLinks.js"></script>   </head> <body> <div id="purdue"><div id="container"><a href="#main" class="skiplink" accesskey="2">Skip to main content</a> <div id="header">   <div id="pagetitle"> <h1><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/" title="Purdue e-Pubs">Purdue e-Pubs</a></h1> </div> </div><div id="navigation"><div id="tabs"><ul><li id="tabone"><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/" title="Home" accesskey="3"><span>Home</span></a></li><li id="tabtwo"><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/about.html" title="About"><span>About</span></a></li><li id="tabthree"><a href="https://web.archive.org/web/20130704143454/http://www.lib.purdue.edu/escholar/epubs/about.html" title="FAQ"><span>FAQ</span></a></li><li id="tabfour"><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/cgi/myaccount.cgi?context=" title="My Account"><span>My Account</span></a></li></ul></div> </div> <div id="wrapper"> <div id="content"> <div id="main" class="text">  <div id="dcn-home">  <h2>Browse and Search by:</h2> <div id="cover-browse"> <h3><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/authors.html">Author Names</a></h3> <h3><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/communities.html">Departments and Centers at Purdue</a></h3> <h3><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/thepress">Purdue University Press</a></h3> <h3><a href="https://web.archive.org/web/20130704143454/http://ezproxy.lib.purdue.edu/login?url=http://docs.lib.purdue.edu/dissertations">Doctoral Dissertations</a></h3> </div> <p>Purdue e-Pubs is a service of the Purdue University Libraries, providing online publishing support for original publications as well as hosting for Purdue-affiliated articles, reports, conference proceedings, student scholarship, and more. Contact <a href="https://web.archive.org/web/20130704143454/mailto:epubs@purdue.edu">the Libraries</a> to discuss opportunities to bring additional Purdue-affiliated scholarship online.</p>   <div class="clear"></div> <div class="box sunburst"> <div id="chart"></div> <p class="view-sunburst"><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/sunburst.html">View Larger <i class="icon-arrow-right"></i></a></p> </div> <script src="/web/20130704143454js_/http://docs.lib.purdue.edu/assets/d3/d3.v2.js"></script> <script type="text/javascript" src="/web/20130704143454js_/http://docs.lib.purdue.edu/assets/scripts/sunburst.pack.js"></script> <script type="text/javascript"> var sunburst = new DisciplineSunburst( DisciplineSunburst.nextId(), { data_url: "/assets/disciplines/docs.lib.purdue.edu/disciplines.json" , canvas: { w: 200 , h: 200 } , graphClickFn: function( d ) { document.location = 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inDatum.label ) textLines.push( "Explore " + DisciplineSunburst.formatInt( inDatum.total_works ) + " works" ); if ( inDatum.total_disciplines && inDatum.total_disciplines > 0 ) { textLines.push( "in " + DisciplineSunburst.formatInt( inDatum.total_disciplines ) + " disciplines" ); } } return textLines; } } } ); sunburst.init(); </script>  <div class="box aag"><h2>At a Glance</h2><p><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/topdownloads.html">Top 10 Downloads<span>All time</span></a><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/recent_additions.html">Recent Additions<span>50 most recent additions</span></a></p></div>  <div class="box potd"><h2>Paper of the Day</h2> <p><a href="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/dissertations/AAI3453114" title="Published in ETD Collection for Purdue University">Evaluating the pre-operational and operational test instruments and testing strategies for the Gearing Up for Safety: Production Agricultural Safety Training... <span>William Brian Hoover</span></a></p> </div>  </div> <div class="clear"> </div><p id="stats"><span class="papers">30,365 papers to date</span> <span class="downloads">4,723,633 full-text downloads to date</span> <span class="downloads">2,024,671 downloads in the past year</span></p> </div> <div class="verticalalign"> </div> <div class="clear"> </div> </div> <div id="sidebar"> <p class="site-follow"><span class="pull-right"> <a rel="nofollow" href="https://web.archive.org/web/20130704143454/http://network.bepress.com/api/follow/subscribe?institution=MzM4ZGU4ZWRlZDAwOGEwYg%3D%3D&format=html" data-follow-set="institution:MzM4ZGU4ZWRlZDAwOGEwYg==" title="Follow Purdue e-Pubs" class="btn followable">Follow</a> </span></p>  <form method="get" action="https://web.archive.org/web/20130704143454/http://docs.lib.purdue.edu/do/search/" id="sidebar-search"> <label for="search" accesskey="4">Enter search terms:</label> 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