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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">超辐射现象——类似排水孔的旋涡一样 </h1> <p class="xg1"> 时间：2017-6-16 09:26<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(877)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=5771&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>当水波流经漩涡时中散射时，可以从中获得能量。这是巴西、加拿大和英国科学家共同得出的结论，这也是首次观察到一种称为“旋转超辐射散射”的现象。研究小组说这种效应可以用来研究黑洞物理学。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 当水波流经漩涡时中散射时，可以从中获得能量。这是巴西、加拿大和英国科学家共同得出的结论，这也是首次观察到一种称为“旋转超辐射散射”的现象。研究小组说这种效应可以用来研究黑洞<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201706/16/092603fmvw9j2jf98kf42m.jpg" target="_blank"><img src="data/attachment/portal/201706/16/092603fmvw9j2jf98kf42m.jpg"></a></p></div><div><br></div><div> Silke Weinfurtner和工作在诺丁汉大学、联邦大学ABC和不列颠哥伦比亚大学的科研同事采用矩形的长1.5米，宽3米的水池进行观察。水不断地从一个角落泵入水箱，并通过水箱中间直径4厘米的孔排水排出，形成一个熟悉的排水漩涡。</div><div><br></div><div> 控制水流，使水箱中的水始终是6.25厘米深，然后该研究团队在水箱的一个边产生一个平面波，其激发频率在2.9 到4.1赫兹的范围内。一个“吸收边”放置于水箱的另一面，以尽量减少反射回油箱的反射波的影响。</div><div><br></div><div><b><font color="#f00000"> 简易的实验水箱</font></b></div><div><br></div><div> 研究人员开发出一种特殊的3D<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器，能够精确<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>穿过中心漩涡的波的高度。研究小组称，不同激励频率下的波浪图像与“简单浴盆流模型”相一致。此外，平面波经过一个角相位散射与量子力学中的伯姆效应类似。</div><div><br></div><div> 研究小组还研究了波与漩涡的相互作用，它通过相对于水的旋转方向来表示入射波的方位分量。研究发现，方位波分量在涡流方向上旋转时，其散射能量较低，这是涡能吸收能量的结果。然而，方位角波动分量与旋转方向相同时，由于超辐射散射会从涡获中得的能量，在3.7赫兹时大约会有14%的最大放大值。</div><div><br></div><div> 研究小组指出，确切地说能量是如何消失在漩涡中的目前还不知道，这可能是未来实验的主题，将试图测量消耗在排水孔中的波浪能量的数量。这些实验可以提供黑洞的一些观察参考，黑洞可以用与水从水箱中旋转的波相结合来进行模拟。</div><div><br></div><div> 这项研究已经发表在《自然物理学》杂志中。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201706/16/092618ujbu4smv9btutbgj.jpg" target="_blank"><img 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<span class="xg1 xw0">2017-6-16 15:06</span> </dt> <dd>嘘，低调。</dd> </dl><a name="comment_anchor_13055"></a> <dl id="comment_13055_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(13055, '5771');">引用</a> </span> <a href="http://club.oecr.com/space-uid-89512.html" class="xi2 xw1" c="1">海盗天</a> <span class="xg1 xw0">2017-6-16 14:36</span> </dt> <dd>搞光电的mm很少吧。</dd> </dl><a name="comment_anchor_13050"></a> <dl id="comment_13050_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(13050, '5771');">引用</a> </span> <a href="http://club.oecr.com/space-uid-98585.html" class="xi2 xw1" c="1">calvinsong</a> <span class="xg1 xw0">2017-6-16 12:06</span> </dt> <dd>very good ！！</dd> </dl><a name="comment_anchor_13049"></a> <dl id="comment_13049_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(13049, '5771');">引用</a> </span> <a href="http://club.oecr.com/space-uid-24873.html" class="xi2 xw1" c="1">sunysea</a> <span class="xg1 xw0">2017-6-16 11:36</span> </dt> <dd>希望有一天能变成现实。</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" class="area"></div><!--[/diy]--> </div> <div class="sd pph"> <div class="drag"> <!--[diy=diyrighttop]--><div id="diyrighttop" class="area"><div id="framepeEZDd" class="sy_ltdr frame move-span cl frame-1"><div class="frame-title title"><span class="titletext">社区成员推荐</span></div><div id="framepeEZDd_left" class="column frame-1-c"><div id="framepeEZDd_left_temp" class="move-span temp"></div><div id="portal_block_910" class="cl_block_bm block move-span"><div id="portal_block_910_content" class="dxb_bc"><div class="module cl ml mls"> <ul><li> <a href="http://club.oecr.com/space-uid-7522.html" c="1" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=7522&size=small" width="71" 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