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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=57" 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=87861&size=small" /></div> <h1 class="ph">健康的室内移动通信 </h1> <p class="xg1"> 时间：2009-4-10 11:36<a class="zz" href="home.php?mod=space&uid=87861">作者：信息发布员</a> 阅读<em id="_viewnum">(1311)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=57" 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>随着无线电波的使用日益增多，人们开始关心无线电波是否会对人体健康造成不良影响。过去十几年中，人们在这方面开展了无数研究，各个科研组织根据研究结果制订了人体暴露于射频电磁场中的限值。</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"><P>随着无线电波的使用日益增多，人们开始关心无线电波是否会对人体健康造成不良影响。过去十几年中，人们在这方面开展了无数研究，各个科研组织根据研究结果制订了人体暴露于射频电磁场中的限值。世界卫生组织（WHO）以及其它一些国内和国际专家小组审阅了大量有关无线电波、手机与健康的研究报告。它们的结论基本一致，即就是没有证据表明手机和基站产生的射频电磁场会对人体健康造成不良影响。即便如此，人们还是在面对林立的无线基站和无处不刻不在的手机通讯中显得万分焦虑。</P> <P>无线电波与健康 </P> <P>手机辐射对人体的影响尚在不断的观察与研究之中, 国外有大量相互矛盾的研究报告, 目前尚未有全面的科学的结论。 由于人体组织结构的复杂性，<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>上计算天线辐射功率与人体内场强分布的关系非常困难。但根据电磁场理论，有一点是可以肯定的，在天线结构以及手机和人体相对位置一定的情况下，天线输出功率越大，在人体内形成的电场强度越高，人体吸收的射频辐射功率也就越大。</P> <P><A href="http://www.oecr.com/batch.download.php?aid=41" target=_blank><IMG border=0 src="http://www.oecr.com/attachments/2009/04/87861_200904101137101mM94.jpg" ?></A></P> <P>目前普遍采用的衡量标准是特定吸收率SAR值(SPECIFIC ABSORPTION RATE)，它指的是人体单位质量吸收的射频功率，是一个用于限制公众和职业人员在10 MHz-10 GHz频率范围内的暴露量的数值。而世界卫生组织所规定的SAR安全值为6秒暴露时间全身吸收量为0.08W/kg。现在手机大致SAR<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>得到的结果，CDMA手机最大发射功率为0.2W(3dBm), GSM手机最大发射功率为2W但GSM手机只在1/8的时间发射(最大发射功率和全速率移动的情况下)。 而减少空间中电磁辐射对于人体伤害的有效手段主要为降低天线的发射功率和降低手机全功率发射的时间。</P> <P>健康的室内覆盖系统</P> <P>由于人们大部分的生活和工作时间是在室内度过，科学部署室内无线<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>系统从而大幅降低手机的发射功率就变得格外重要。因此世界各地的运营商为了给公众营造高质量，无风险的无线网络都不遗余力的投资在无线室内覆盖的建设和实施，爱立信更是其中的领导者，从1999年起就在世界各地部署了室内的无线网络，通过大量的实战经验，爱立信也总结出更加行之有效的解决方案。为了在室内环境中获得良好的覆盖和容量，爱立信提倡为网络部署专用室内网络，将天线安装在建筑物内，这种解决方案就叫做分布式天线系统。</P> <P>在降低手机的发射率的同时，配备分布式天线的室内系统能够大幅度降低室内电磁辐射。室外宏基站的平均发射功率为43dBm（20瓦），但室内天线和配备内置天线的微微小区无线基站的最大输入功率通常低于30 dBm（1瓦），而在一个分布式室内天线系统中，等效全向辐射功率甚至可以低至0 dBm和20 dBm（1毫瓦–100毫瓦）之间。这就大大降低了基站系统本身对室内长时间使用者的<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>辐射危害, 使得他们能够实现长时间的使用无线网络而无需担心电磁辐射的危害。 </P></td></tr></table> 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