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 <title>iMechanica - thin-walled structures - Comments</title>
 <link>http://imechanica.org/taxonomy/term/619</link>
 <description>Comments for &quot;thin-walled structures&quot;</description>
 <language>en</language>
<item>
 <title>wrongly estimated: persistence length of a carbon nanotube</title>
 <link>http://imechanica.org/node/844#comment-1175</link>
 <description>&lt;p&gt;In the discussion section of the paper, the persistence length of a carbon nanotube was estimated wrongly.&lt;/p&gt;
&lt;p&gt;For a carbon nanotube, the Young&amp;#39;s modulus &lt;em&gt;E&lt;/em&gt; defined in this paper is not a constant. The material constant is &lt;em&gt;E&lt;/em&gt;*&lt;em&gt;R&lt;/em&gt;*&lt;em&gt;t&lt;/em&gt;. Therefore, for carbon nanotube, the persistence length &lt;em&gt;l&lt;/em&gt;p does not scale to 4.4*&lt;em&gt;R&lt;/em&gt;^(3/2)/&lt;em&gt;t&lt;/em&gt;^(1/2)! &lt;/p&gt;
&lt;p&gt;However this equation, which does not apply to the case of carbon nanotube, was used for the estimation of the persistent length of a carbon nanotube (&lt;em&gt;R&lt;/em&gt;~2, &lt;em&gt;t&lt;/em&gt;~0.2nm). Therefore the conclusion that the persistence is &lt;em&gt;l&lt;/em&gt;p~30nm is wrong.&lt;/p&gt;
&lt;br class=&quot;clear&quot; /&gt;</description>
 <pubDate>Thu, 15 Feb 2007 14:22:06 -0500</pubDate>
 <dc:creator>Henry Tan</dc:creator>
 <guid isPermaLink="false">comment 1175 at http://imechanica.org</guid>
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<item>
 <title>The pdf file is now attached.</title>
 <link>http://imechanica.org/node/844#comment-1156</link>
 <description>&lt;p&gt;Thank you very much for your interest. I have now uploaded the pdf file of the paper.&lt;/p&gt;
&lt;br class=&quot;clear&quot; /&gt;</description>
 <pubDate>Wed, 14 Feb 2007 10:59:45 -0500</pubDate>
 <dc:creator>Ashkan Vaziri</dc:creator>
 <guid isPermaLink="false">comment 1156 at http://imechanica.org</guid>
</item>
<item>
 <title>The link does not work.
</title>
 <link>http://imechanica.org/node/844#comment-1154</link>
 <description>&lt;p&gt;The link does not work.&lt;/p&gt;
&lt;br class=&quot;clear&quot; /&gt;</description>
 <pubDate>Wed, 14 Feb 2007 09:50:40 -0500</pubDate>
 <dc:creator>Haimin Yao</dc:creator>
 <guid isPermaLink="false">comment 1154 at http://imechanica.org</guid>
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