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对于自制天线的无线电QRP爱好者来说，一台能够进行天线测试的仪器至关重要。如果拥有频谱分析仪，配合额外的反射电桥，即可对天线的谐振频率进行简单测试。这里记录了自己进行反射电桥试制的整个过程，绕了一些弯...

虚拟现实技术发展现状和发展趋势一. 国内外虚拟现实几种主流技术的介绍 VRML技术　　虚拟现实技术与多媒体、网络技术并称为三大前景最好的计算机技术。自1962年，美国青年（Morton Heili...

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