< >求两道老题的论文,大家伸出援助之手。</P>
< >一、太阳能热水器的倾角计算
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< >讨论南京地区太阳能热水器的倾角<v:shapetype> <v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path gradientshapeok="t" extrusionok="f" connecttype="rect"></v:path><LOCK aspectratio="t" v:ext="edit"></LOCK></v:shapetype><v:shape><v:imagedata></v:imagedata></v:shape>与热效率的关系,这里倾角是指热水器受热面与水平面的夹角。(1)计算一年中春分、秋分、夏至、冬至这四天中<v:shape> <v:imagedata></v:imagedata></v:shape>的最优值。(2)若某用户夏天热水用不完,冬天不够用,又如何确定<v:shape> <v:imagedata></v:imagedata></v:shape>的值?(3)若允许一年中调节两次倾角,选定在一年中的几月几号最好?倾角如何改变?热效率可提高多少?若允许调节4次又如何?(4)若考虑南京一年四季天气特点、早晚大气折射,结论又将如何?(最后一问选做)
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<P>二、脉冲通讯
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<P><FONT face="Times New Roman"> </FONT>某连通的通讯系统有<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>个网站,网站之间一共有<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>条通讯线路。若用顶点表示网站,用边表示通讯线路<FONT face="Times New Roman">,</FONT>则该系统可用一颗“树”表示。其中有<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>个网站可发布信息,<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,可发布信息的网站称为<B>源</B>。源发布的信息是这样传播的:拥有该信息的网站每隔一个单位时间(以下简称“步”)“有选择”地向与它邻接但未获得该信息最多一个网站发送信息,这里所谓“有选择”是指使得源的信息传播到所有网站所需总时间最少。设<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>是一个源,<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>的信息至少需要<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>步才能传播到所有顶点,则称<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>的<B>脉冲通讯时间</B>(简称<B>脉冲时间</B>)为<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>。</P>
<P>例如,图<FONT face="Times New Roman">1</FONT>中<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape><FONT face="Times New Roman">=8</FONT>,不难验证源<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>的脉冲时间为<FONT face="Times New Roman">3</FONT>,其余顶点旁的数字表示该顶点在第几步获得<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>的信息。</P>
<P>给定正整数<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>和<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,若<FONT face="Times New Roman">T</FONT>是一棵树,在<FONT face="Times New Roman">T</FONT>中可找到<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>个源,它们的脉冲时间均不超过<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,但不存在这样<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>个源,它们的脉冲时间均不超过<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,则称<FONT face="Times New Roman">T</FONT>为<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>脉冲(通讯)树。顶点数最多的<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>脉冲树称为<B>最大</B><B><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></B><B>脉冲(通讯)树</B>。其顶点数记为<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>。</P>
<P>容易验证<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,而<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>不存在。对任给的正整数<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>,使<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>一定存在的最大的<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>记为<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>。于是<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>。令<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape>。讨论以下问题:以下省略.......................................................</P>
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<P>第一题在论坛里看到了,但没图没公式,看不懂,达人帮忙</P>
[此贴子已经被作者于2005-8-31 19:59:34编辑过]
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