共查询到19条相似文献,搜索用时 218 毫秒
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无线电事业迅速发展起来,同时也使人们处于极大的复杂的电磁环境之中。电磁辐射污染直接影响环境及人体健康。本文介绍了电磁环境污染的现状及防护措施,试图通过计算机操作控制电磁环境监测进行初步探索,努力使人们电磁环境监测的相关知识进一步增强。 相似文献
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DES加密算法的差分电磁攻击实现 总被引:2,自引:2,他引:0
差分电磁攻击是一种针对密码算法的侧信道攻击方法.根据CMOS器件工作时产生发射辐射的原理,建立了针对DES加密算法的电磁侧信道攻击平台;对差分攻击方法和电磁辐射分析进行了说明;结合虚拟仪器技术,采用磁场探头对单片机的电磁辐射进行测量,获得了较好的信号;利用针对多CPU的优化算法,实现了在1000组样本量下快速破解DES加密算法,整个实验过程在半小时内完成. 相似文献
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移动电话电磁辐射及防护 总被引:1,自引:0,他引:1
随着信息技术的发展,移动电话的使用日益普及,移动电话电磁辐射污染问题也越来越受到人们的关注。为了减小移动电话对用户健康的影响,从移动电话电磁辐射的原理出发,结合国家电磁辐射防护标准,对用户提出了防护移动电话电磁辐射的建议,使用户尽量远离移动电话电磁辐射污染,以保护用户的身体健康。 相似文献
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Qian Zhang Qijie Liang Zheng Zhang Zhuo Kang Qingliang Liao Yi Ding Mingyuan Ma Fangfang Gao Xuan Zhao Yue Zhang 《Advanced functional materials》2018,28(1)
Nowadays, mankind faces increasingly energy crisis and electromagnetic radiation pollution. An energy harvester with function of protecting human health from electromagnetic radiation is a desirable solution to this problem. Here, a stretchable electromagnetic shielding hybrid nanogenerator (ES‐HNG) is reported which can not only scavenge thermal and mechanical energy from living environment but also protect and monitor human health. The ES‐HNG is capable of transforming mechanical and thermal energy to electricity based on triboelectric, piezoelectric, and pyroelectric effects. To be devised as a computer keyboard cover, ES‐HNG takes about 200 s to charge a capacitor to 3 V by typing. The stored energy can drive the portable devices successfully. Besides, the ES‐HNG eliminates electromagnetic radiation of computer completely due to its unique electromagnetic shielding property. A large range of electromagnetic wave (frequency is between 0 and 1.5 GHz) is shielded more than 99.9978% by the ES‐HNG. Moreover, the ES‐HNG is able to monitor human health by attaching it on human abdomen to be a self‐powered sensor. This work opens up a new prospect of harvesting energy effectively as well as protecting/monitoring human health from electromagnetic radiation surroundings. 相似文献
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电磁辐射污染被世界卫生组织列为继空气污染、水污染和噪声污染之后第四大污染,被称为"隐形杀手"。根据电磁辐射污染的成因,我们总结出了科学有效的防护措施。 相似文献
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对采用智能天线的移动通信系统的电磁干扰性能进行了分析与仿真.仿真结果表明,采用智能天线的移动通信系统可以减少对环境所造成的电磁干扰和电磁污染,并且电磁干扰是随着用户分布而变化的,是有方向性的.与采用传统全向单天线的移动通信系统相比较,采用智能天线的移动通信系统最大干扰抑制比可达14.52dB,平均干扰抑制比为6.94dB. 相似文献