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	<title>Nine Rivers</title>
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	<link>http://9rivers.linkka.com</link>
	<description>Molecular modeling in Materials Sciences Web development Programming IT</description>
	<lastBuildDate>Wed, 04 Apr 2012 15:38:39 +0000</lastBuildDate>
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		<title>Difference between modeling and simulation</title>
		<link>http://9rivers.linkka.com/2012/03/30/difference-between-modeling-and-simulation/</link>
		<comments>http://9rivers.linkka.com/2012/03/30/difference-between-modeling-and-simulation/#comments</comments>
		<pubDate>Fri, 30 Mar 2012 12:38:39 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Modeling & Simulation]]></category>
		<category><![CDATA[modeling]]></category>
		<category><![CDATA[simulation]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=735</guid>
		<description><![CDATA[I&#8217;m doing molecular modeling and simulation in chemistry and material science. The words &#8220;modeling&#8221; and &#8220;simulation&#8221; are often used interchangeably in my texts. However, more precise distinction  must be made in scientific publications. Beat Schwendimann gave clear definitions of them. (I quoted his texts below) The original post is here: http://proto-knowledge.blogspot.com/2010/12/what-is-difference-between-simulation.html by Beat Schwendimann The [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Never give up!</title>
		<link>http://9rivers.linkka.com/2012/03/05/never-give-up/</link>
		<comments>http://9rivers.linkka.com/2012/03/05/never-give-up/#comments</comments>
		<pubDate>Mon, 05 Mar 2012 13:04:34 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Random thoughts]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=729</guid>
		<description><![CDATA[]]></description>
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		<item>
		<title>Mini-me by amazing tool ScribblerToo</title>
		<link>http://9rivers.linkka.com/2012/02/28/mini-me-by-amazing-tool-scribblertoo/</link>
		<comments>http://9rivers.linkka.com/2012/02/28/mini-me-by-amazing-tool-scribblertoo/#comments</comments>
		<pubDate>Tue, 28 Feb 2012 17:42:11 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Fun]]></category>
		<category><![CDATA[Software]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=715</guid>
		<description><![CDATA[I drew this self-portrait in 20 seconds with the amazing ScribblerToo by zefrank. This small flash gadget implements a simple but very catchy shading effect by introducing extra thin lines based on the line drawing by the users. You can find a lot of wonderful work on the internet if you search its name at [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>You need to look at this picture every day!</title>
		<link>http://9rivers.linkka.com/2012/02/25/you-need-to-look-at-this-picture-every-day/</link>
		<comments>http://9rivers.linkka.com/2012/02/25/you-need-to-look-at-this-picture-every-day/#comments</comments>
		<pubDate>Sat, 25 Feb 2012 04:21:38 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Notes]]></category>
		<category><![CDATA[Random thoughts]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=705</guid>
		<description><![CDATA[Don&#8217;t know where I found this (possibly on Google+). Very encouraging! But I think Nike&#8217;s slogan is more concise and conveys essentially the same meaning, &#8220;Just do it!&#8221;]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Ways to load structure and coordinate files into VMD</title>
		<link>http://9rivers.linkka.com/2012/02/24/ways-to-load-structure-and-coordinate-files-into-vmd/</link>
		<comments>http://9rivers.linkka.com/2012/02/24/ways-to-load-structure-and-coordinate-files-into-vmd/#comments</comments>
		<pubDate>Fri, 24 Feb 2012 18:57:57 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Modeling & Simulation]]></category>
		<category><![CDATA[Notes]]></category>
		<category><![CDATA[modeling]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=680</guid>
		<description><![CDATA[This is not even a tip of VMD, because it should have been known by most of the experienced VMD users. However, in case you are new to VMD or still do know these, you will be happy for seeing this post.:) Use the GUI menu: First, click menu &#8220;File-&#62;New Molecule &#8230;&#8221; to read the [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Last saved or modified date in MS Word</title>
		<link>http://9rivers.linkka.com/2012/02/24/last-saved-or-modified-date-in-ms-word/</link>
		<comments>http://9rivers.linkka.com/2012/02/24/last-saved-or-modified-date-in-ms-word/#comments</comments>
		<pubDate>Fri, 24 Feb 2012 12:35:16 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Notes]]></category>
		<category><![CDATA[Software]]></category>
		<category><![CDATA[Office]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=674</guid>
		<description><![CDATA[In MS Word 97, you could insert data &#038; time by clicking the &#8216;Date &#038; time&#8217; button on the insert->text panel. This will by default insert a dynamically updated field that shows the &#8216;current&#8217; date (when this field is updated. Why is it the current date? because this field will be automatically updated when you [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Remember the path of last login</title>
		<link>http://9rivers.linkka.com/2011/12/02/remember-the-path-last-login/</link>
		<comments>http://9rivers.linkka.com/2011/12/02/remember-the-path-last-login/#comments</comments>
		<pubDate>Fri, 02 Dec 2011 06:16:59 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Articles in English]]></category>
		<category><![CDATA[Programming]]></category>
		<category><![CDATA[bash]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=670</guid>
		<description><![CDATA[create ~/.bash_logout with the following contents: 12t=`readlink -f \`pwd\`` ln -sfn $t ~/lastdir Each time when you log off, the current dir is remembered and a symlink is created in ~/ . It&#8217;s convenient for the next time:) NOTE: 1. &#8220;readlink -f&#8221; to ensure you ALWAYS get the really full path (or you will have [...]]]></description>
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		<item>
		<title>FENE势函数的函数图像和不同版本</title>
		<link>http://9rivers.linkka.com/2011/11/18/fene%e5%8a%bf%e5%87%bd%e6%95%b0%e7%9a%84%e5%87%bd%e6%95%b0%e5%9b%be%e5%83%8f%e5%92%8c%e4%b8%8d%e5%90%8c%e7%89%88%e6%9c%ac/</link>
		<comments>http://9rivers.linkka.com/2011/11/18/fene%e5%8a%bf%e5%87%bd%e6%95%b0%e7%9a%84%e5%87%bd%e6%95%b0%e5%9b%be%e5%83%8f%e5%92%8c%e4%b8%8d%e5%90%8c%e7%89%88%e6%9c%ac/#comments</comments>
		<pubDate>Fri, 18 Nov 2011 13:22:48 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[中文文章]]></category>
		<category><![CDATA[分子模拟]]></category>
		<category><![CDATA[forcefield]]></category>
		<category><![CDATA[modeling]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=650</guid>
		<description><![CDATA[FENE（finitely extensible nonlinear elastic）势函数可以用来描述分子成键相互作用。它的主要特点是最大键长只能有限值，这是和harmonic成键函数的主要不同之处。文献中有两个常用的版本： 1. Kremer版： 特点是用一个WCA势函数作为“硬核”。不方便的地方是，势能的极小值与硬核势的参数有关，不是十分直观。同时这个势函数关于势能极小值是非对称的。 2. Binder版：无需而外硬核势防止原子重叠，势函数本身关于极小值对称，且可以直接指定势能极小值的位置。 FENE势函数的另一个特征是存在上下两个发散的边界位置，在边界处势能值为正无穷大。（Kremer版下边界在r=0位置，由WCA势函数参数控制。Binder版的下边界与rmax关于rmin对称，因此有可能在r&#60;0的位置） 具体的函数图象见下或参见我在SimuWorld上的帖子。 注：Kremer和Binder版FENE势函数在LAMMPS中分别由bond_style fene和bond_style fene/expand实现。]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Ubuntu wubi.exe installation</title>
		<link>http://9rivers.linkka.com/2011/11/16/ubuntu-wubi-exe-installation/</link>
		<comments>http://9rivers.linkka.com/2011/11/16/ubuntu-wubi-exe-installation/#comments</comments>
		<pubDate>Wed, 16 Nov 2011 18:26:17 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[Articles in English]]></category>
		<category><![CDATA[Software]]></category>
		<category><![CDATA[linux]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=646</guid>
		<description><![CDATA[The Ubuntu CD contents look like these: There is an executable named &#8220;wubi.exe&#8221;, which allows you installing Ubuntu alongside with an existing Windows system (dual-boot). However, many people experienced &#8220;no response&#8221;  problem after double clicking the wubi.exe. Some say this is because some of your drives contains non-English labels. However, this is not always the [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Chinese character display with VPtyhon</title>
		<link>http://9rivers.linkka.com/2011/11/15/chinese-character-display-with-vptyhon/</link>
		<comments>http://9rivers.linkka.com/2011/11/15/chinese-character-display-with-vptyhon/#comments</comments>
		<pubDate>Tue, 15 Nov 2011 08:38:12 +0000</pubDate>
		<dc:creator>9rivers</dc:creator>
				<category><![CDATA[编程]]></category>
		<category><![CDATA[软件应用]]></category>
		<category><![CDATA[3D]]></category>
		<category><![CDATA[Python]]></category>

		<guid isPermaLink="false">http://9rivers.linkka.com/?p=640</guid>
		<description><![CDATA[VPython到底能不能显示中文字符？能显示哪些中文字体？下面的code给出答案。 123456789101112131415from visual import * label&#40;pos=&#40;0,0,0&#41;, text=u'测试'&#41; #print shapes.findSystemFonts() #pl = shapes.text(text=u'测试') #凡是ttf字体文件用windows字体查看器查看typeface name不乱码的（显示中文）字体都可以使用 text&#40;text=u'中文', align='center', depth=-0.3, color=color.green, font=u'C:\\WINDOWS\\Fonts\\simkai.ttf'&#41; text&#40;text=u'字体', align='center', depth=-0.3, color=color.yellow, font=u'C:\\WINDOWS\\Fonts\\msyh.ttf',pos=&#40;0,-1,0&#41;,height=0.5&#41; text&#40;text=u'字体', align='left', depth=-0.3, color=color.red, font=u'C:\\WINDOWS\\Fonts\\jianhuangcao.ttf',pos=&#40;0,-1,0&#41;&#41; 可见VPython不仅支持中文3D字体生成，而且也支持不同字体。但是我发现并不是所有中文字体都能使用，至少在我的英文版WinXP上是这样。一个技巧是，在windows中双击字体ttf文件用字体查看器查看字体，如果显示的typeface name是正确的中文字符，那么这个字体可以使用，如果是乱码则不能。 最近VPython又加入了extrusion的功能，因此生成的中文字形也可以经过挤出形成其它复杂造型，会有很多不同用途。]]></description>
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