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随着社会和科学技术的发展,电磁辐射问题日益受到各方面的重视.受信息产业部电信管理局和科学技术司的共同委托,信息产业部通信计量中心于2002年1月24~25日在厦门成功举办了移动电话电磁辐射(SAR)研讨会. 相似文献
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First-principles investigation of chemical modification on two-dimensional iron–phthalocyanine sheet
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Successful synthesis of single iron–phthalocyanie(FePc) framework layer on substrate and its transferrable properties open the door for decorating the separately distributed transition metals for exploring the diverse properties. We have studied the effects of chemical modification on two-dimensional FePc organometallic framework with density functional theory. For simplicity, the non-metal atoms with variant valence electrons are used as prototypes to estimate the effects from chemical modifications with different functional groups. The thermo-stabilities of the non-metal atom decorated complex sheet materials have been estimated by the first-principles constant energy molecular dynamic simulations. Upon the nonmetal atom adsorption, the magnetic moment could be changed from 2 μBto 0, 1, 2, and 3 μBper unit cell for the case of tetra-, penta-, hexa-, and hepta-valent non-metal modifications, respectively, showing interesting promise to tailor its magnetic properties for potential applications. 相似文献
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由大唐电信代表中国政府提交的具有自主知识产权的TD—SCDMA技术先后被ITU—T和3GPP,采纳为第三代移动通信国际标准,成为中国百年电信史上的重要突破。[第一段] 相似文献
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遗传算法自诞生以来,凭借自身优越的全局寻优、不依赖目标函数梯度信息等特性,已在科研领域内得到了广泛应用.应用遗传算法解决移动机器人静态全局路径规划,利用神经网络模型描述环境信息,得到神经网络输出与无碰撞路径的关系,然后将路径的二维编码简化为一维编码,从而将无碰撞约束和最短路径约束合并在一个适应度函数中.在一定程度上提高了运算效率,通过计算仿真证明,方法是正确有效的. 相似文献
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研究了Lebesgue-Stieltjes形式的Choquet积分的收敛性定理,如单调收敛定理、法都引理、控制收敛定理等. 相似文献