排序方式: 共有11条查询结果,搜索用时 218 毫秒
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随着对沙漠边缘及腹地合理有效的开发,沙漠产生的经济效益也越来越大,通信的重要性随之凸显出来,沙漠地区无线通信的覆盖亟待解决。无线通信系统的性能主要受到无线信道的制约,沙漠地区视野开阔信号传播距离非常远,随着传播距离的增大,地球曲率对电磁波传播的影响也会逐步增大。文章从经典电波传播模型中的双线地面反射模型出发,增加地球曲率因子,提出一个对沙漠地区远距离电波传播特性具有理论指导意义的双线模型,通过对模型进行仿真对比可知地球曲率会增加电波的损耗。 相似文献
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In a colloidal system confined by a small cylindric pipeline, the
depletion interaction between two large spheres is different to the
system confined by two plates, and the influence on depletion
interaction from the pipeline is related to both the size and shape
of it. In this paper, the depletion interactions in the systems
confined by pipelines of different sizes or different shapes are
studied by Monte Carlo simulations. The numerical results show that
the influence on depletion force from the cylindric pipeline is
stronger than that from two parallel plates, and the depletion force
will be strengthened when the diameter of the cylinder is decreased.
In addition, we also find that the depletion interaction is rather
affected if the shape change of the pipeline is slightly changed,
and the influence on depletion force from the shape change is
stronger than that from the size change. 相似文献
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为了满足通信设备大容量数据传输与设备小型化的需求,提出了一种包括矩形贴片、介质基板和开槽接地板的多模式可重构太赫兹微带天线.基于石墨烯材料在太赫兹波段的电可控特性,将3组石墨烯作为调控开关分布在开槽处,通过控制石墨烯的偏置电压实现开关通断.该天线具有6种频率可重构模式,谐振频率分布在2.652~4.565 THz范围内... 相似文献
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针对绝热近似小参数随机共振方法不足,文章提出了一种改进的变步长随机共振数值算法,该方法通过调整计算步长,使随机共振方法能同时处理大、小参数信号,仿真结果表明了该算法简单可行,具有良好的应用前景。 相似文献
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基于C8051F000的多通道数据采集范围控制系统 总被引:4,自引:0,他引:4
介绍了利用Cygnal公司的C8051F000单片机可编程窗口检测器,进行多通道数据采集范围控制的硬件组成和软件设计方法。 相似文献
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