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<!DOCTYPE html>
<html lang="en">
<head>
<title>木大</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="./theme/css/main.css" type="text/css" />
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<ol id="posts-list" class="hfeed" start="6">
<li><article class="hentry">
<header>
<h1><a href="./search-engine.html" rel="bookmark"
title="Permalink to 学术搜索引擎-转载">学术搜索引擎-转载</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-08-11T00:00:00">
四 11 八月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/物理.html">物理</a>. </p>
<p>tags: <a href="./tag/学术.html">学术</a><a href="./tag/搜索.html">搜索</a></p>
</footer><!-- /.post-info -->
<p>1、<a href="http://cholar.google.com">http://scholar.google.com/</a></p>
<p>这个不多讲了. </p>
<p>2、http://qns.cc/ </p>
<p>后起之秀，科研人员的良好助手，上此网站的90%是从事科研的学生与老师。其词典搜索集成了目前市面上最好的在线英汉写作及科研词典，用此搜索引擎写作英文论文相当方便；其文献搜索集成了目前最优秀的数据库。</p>
<p>3、http://www.scirus.com </p>
<p>Scirus是目前互联网上最全面、综合性最强的科技文献搜索引擎之一，由Elsevier科学出 </p>
<p>版社开发，用于搜索期刊和专利，效果很不错！Scirus覆盖的学科范围包括：农业与生物 </p>
<p>学，天文学，生物科学，化学与化工，计算机科学，地球与行星科学，经济、金融与管理 </p>
<p>科学，工程、能源与技术，环境科学，语言学，法学，生命科学，材料科学，数学，医学 </p>
<p>，神经系统科学，药理学 ...</p>
<a class="readmore" href="./search-engine.html">read more</a>
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</div><!-- /.entry-content -->
</article></li>
<li><article class="hentry">
<header>
<h1><a href="./Geant4-sim-teach2.html" rel="bookmark"
title="Permalink to Geant4模拟总结（二）">Geant4模拟总结（二）</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-08-02T00:00:00">
二 02 八月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/物理.html">物理</a>. </p>
<p>tags: <a href="./tag/geant4.html">geant4</a><a href="./tag/模拟.html">模拟</a></p>
</footer><!-- /.post-info -->
<p>今天要讲的主要是DetectorConstructor的编写。</p>
<p>首先介绍下神马是DetectorConstructor。我们知道唱戏先得搭台子。创建编写DetectorConstructor类就是为模拟搭戏台舞台。比如你要模拟中子穿过晶体的过程。那么你首先得摆一块晶体。要摆一块晶体，除非你已经有一块形状尺寸材料都很理想的晶体了，然后你可以把它摆到某一个位置，放到位置后还可以再转一转方向什么的。否则，你就得自己去定义一块晶体出来，就像上边提到的，定义出晶体的材料、形状、尺寸。然后你就可以把这块晶体放到你想放置的位置了。</p>
<p><strong>首先</strong>，定义材料。比如你想用的材料是纯CsI材料。你要先定义Cs原子和I原子。你可以像这样来定义：</p>
<div class="codehilite"><pre><span class="n">G4Element</span><span class="o">*</span> <span class="n">elementCs</span> <span class="o">=</span> <span class="k">new</span> <span class="n">G4Element</span><span class="p">(</span> <span class="s">"Cesium"</span><span class="p">,</span> <span class="s">"Cs"</span><span class="p">,</span> <span class="mi">55</span><span class="o">.</span> <span class="p">,</span> <span class="mf">132.90543</span><span class="o">*</span><span class="n">g</span><span class="o">/</span><span class="n">mole</span> <span class="p">);</span>
<span class="n">G4Element</span><span class="o">*</span> <span class="n">elementI</span> <span class="o">=</span> <span class="k">new</span> <span class="n">G4Element</span><span class="p">(</span> <span class="s">"Iodine"</span><span class="p">,</span> <span class="s">"I"</span><span class="p">,</span> <span class="mi">53</span><span class="o">.</span> <span class="p">,</span> <span class="mf">126.90447</span><span class="o">*</span><span class="n">g</span><span class="o">/</span><span class="n">mole</span> <span class="p">);</span>
</pre></div>
<p>我们知道，上边的c++代码的语义是：第一行，创建一个指针elementCs，指向一个G4Element类的对象 ...</p>
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</article></li>
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<header>
<h1><a href="./Geant4-1.html" rel="bookmark"
title="Permalink to Geant4模拟总结(一)">Geant4模拟总结(一)</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-07-29T00:00:00">
五 29 七月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/物理.html">物理</a>. </p>
<p>tags: <a href="./tag/geant4.html">geant4</a><a href="./tag/模拟.html">模拟</a><a href="./tag/学术.html">学术</a></p>
</footer><!-- /.post-info -->
<p>笔者是Geant4的初学者，在Geant4学习过程中经历了一段只有例程为师的“痛苦”历程（据说学习Geant4的各位前辈都经历过相同的磨练，并毅然决定把这种心灵与肉体的双重磨砺传播发扬下去。于是在神功初成之后就果断归隐山林，从此不为世人所知。=.- :)）。</p>
<p>在摸索学习Geant4三个月后，笔者对Geant4的使用建立了初步基本的认识。一方面想整理自己对Geant4基本使用方法的粗浅认识，更好的组织和精练自己的知识系统；另一方面也想总结分享下自己学习Geant4的过程和方法以及一些体会，但愿能为后来的Geant4初学者提供绵薄微助。于是有了写这个系列博文的想法。（其实你能看到这些东西还有一个更大的原因，那就是笔者最近迷上了用wordpress写博客=.=!)</p>
<p>本文正如题目所说，是针对没有任何Geant4基础的初学者。不过笔者暂时还没有写如何安装Geant4的教程的想法。笔者也不打算普及计算机教育，默认读者有C++编程基础（如果你还不能阅读C++代码，那还是快先去学一学C++，不用对C++有多么深刻的体会和丰富的实践经验，你只要能读懂一个由数个或者十数个C++类写成的简单C++程序即可），因为Geant4是用C++编写的，你要在Geant4基础上开发模拟程序也要使用C++语言。(鉴于笔者的人生经验尚十分不丰富，如有出现不懂C++却依然能学好Geant4的，纯属奇迹，不管你信不信，反正笔者信；或者说，你丫就是天才！）</p>
<p>好言归正传！</p>
<p>先概括讲一下笔者对Geant4的整体印象。初识Geant4（就是半年前），是因为笔者的本科毕业设计是模拟宇宙线的一个小题目。还没怎么开始做，指导老师量才为用就中途给换了题目 ...</p>
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<header>
<h1><a href="./test2.html" rel="bookmark"
title="Permalink to test">test</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-07-29T00:00:00">
五 29 七月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/测试.html">测试</a>. </p>
<p>tags: <a href="./tag/test.html">test</a></p>
</footer><!-- /.post-info -->
<p>\ \ \ \ 测试段首空格。</p>
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<header>
<h1><a href="./markdown-syntax.html" rel="bookmark"
title="Permalink to MarkDown常用语法">MarkDown常用语法</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-07-28T00:00:00">
四 28 七月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/linux.html">linux</a>. </p>
<p>tags: <a href="./tag/linux.html">linux</a><a href="./tag/markdown.html">markdown</a></p>
</footer><!-- /.post-info -->
<p>纯为自己记录留用。主要选择自己现在初学者迫切需要的语法。日后熟悉了继续发展。</p>
<p>1、空一行（两个回车）分段</p>
<p>2、行末加两个或多个空格才是真正的换行，否则正常的一个回车就像在HTML代码中一样，被当作空
格处理 (很明显，我机器上并非如此，一个回车也被当回车入理了） <br />
3、插入链接：<a href="static/url">链接文字</a></p>
<p>4、图片跟链接很像，在前面加个叹号：！[alt 文字］(图片URL)</p>
<h2>标题</h2>
<p>用1-6个井号（＃）开始一行表示这一行是标题，倒如：</p>
<div class="codehilite"><pre><span class="c">#一级标题</span>
<span class="c">##二级标题</span>
<span class="c">######六级标题</span>
</pre></div>
<blockquote>
<h1>一级标题</h1>
<h2>二级标题</h2>
<h6>六级标题</h6>
</blockquote>
<h2>blockquote</h2>
<p>用右尖括号（>）表示blockquote，你一定见过邮件中这样表示引用别人的内容。可以嵌套，可以包含其它的Markdown元素，例如：</p>
<div class="codehilite"><pre><span class="o">></span> <span class="c1">## This is a header.</span>
<span class="o">></span>
<span class="o">></span><span class="mi">1</span><span class="o">.</span> <span class="n">This</span> <span class="n">is</span> <span class="n">the</span> <span class="n">first ...</span></pre></div>
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<header>
<h1><a href="./photon-sim-promote.html" rel="bookmark"
title="Permalink to 光学过程模拟方法细节promote">光学过程模拟方法细节promote</a></h1>
</header>
<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-07-27T00:00:00">
三 27 七月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/物理.html">物理</a>. </p>
<p>tags: <a href="./tag/模拟.html">模拟</a><a href="./tag/geant4.html">geant4</a><a href="./tag/物理.html">物理</a></p>
</footer><!-- /.post-info -->
<p>光学过程细节要考虑淬灭因子，且原子核淬灭与阿尔法粒子与电子（几乎无淬灭）的淬灭因子都不同。要在physicalList中重写不同粒子的闪烁过程，计算闪烁光子数时分别乘上不同的淬灭因子。详细闪烁过程的编写参考G4dyb项目中的Scintillation类。</p>
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<h1><a href="./script-high.html" rel="bookmark"
title="Permalink to 代码高亮测试">代码高亮测试</a></h1>
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<div class="entry-content">
<footer class="post-info">
<abbr class="published" title="2011-07-27T00:00:00">
三 27 七月 2011
</abbr>
<address class="vcard author">
By <a class="url fn" href="./author/木大.html">木大</a>
</address>
<p>In <a href="./category/测试.html">测试</a>. </p>
<p>tags: <a href="./tag/test.html">test</a></p>
</footer><!-- /.post-info -->
<p>如下：</p>
<div class="codehilite"><pre><span class="nt"><div</span> <span class="na">id=</span><span class="s">”foo”</span><span class="nt">></span>
<span class="cp"><?php</span>
<span class="k">function</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">{</span>
<span class="k">echo</span> <span class="s2">"Hello World!</span><span class="se">\\</span><span class="s2">n"</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o"><</span> <span class="mi">10</span> <span class="nx">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">foo</span><span class="p">();</span>
<span class="p">}</span>
<span class="cp">?></span>
<span class="nt"></div></span>
</pre></div>
<p>Here is an example of AppleScript:</p>
<div class="codehilite"><pre><span class="nb">tell</span> <span class="n">application</span> <span class="s">"Foo"</span>
<span class="n">beep</span>
<span class="n">end</span> <span class="nb">tell</span>
</pre></div>
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<h2>blogroll</h2>
<ul>
<li><a href="http://docs.notmyidea.org/alexis/pelican/">Pelican</a></li>
<li><a href="http://python.org">Python.org</a></li>
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