A wideband rectangular patch antenna resonat- ing at 3.5 GHz and 8 GHz frequencies is developed on a flexible substrate, which can be used for wearable applications. The proposed antenna gives a wide impe- dance bandw...A wideband rectangular patch antenna resonat- ing at 3.5 GHz and 8 GHz frequencies is developed on a flexible substrate, which can be used for wearable applications. The proposed antenna gives a wide impe- dance bandwidth of 116%, operating from 2.SGHz to 9.5 GHz, covering most of the ultra-wideband （UWB） operating frequency range. A two-element multiple-input multiple-output （MIMO） system is developed using the proposed antenna, and the mutual coupling between the two antennas for various separations and frequencies is analyzed by using artificial neural networks （ANNs）. The neural structure is trained by using different ANN algorithms and a comparative study is made between them. It is shown that, quasi-Newton （QN） and quasi- Newton multi layer perceptron （QN-MLP） algorithms are better in terms of training, testing errors, and correlation coefficient.展开更多
针对流域级闸控大型河网水环境日常管理的应用需求与实际特点,将资料适应性强的水文学方法与数据要求相对严苛的水动力-水质数值模型相融合,构建了一维与二维嵌套、分块组合的闸控大型河网水文-水动力-水质耦合数学模型DHQM(Hydrology,H...针对流域级闸控大型河网水环境日常管理的应用需求与实际特点,将资料适应性强的水文学方法与数据要求相对严苛的水动力-水质数值模型相融合,构建了一维与二维嵌套、分块组合的闸控大型河网水文-水动力-水质耦合数学模型DHQM(Hydrology,Hydrodynamics,and Water Quality Model for Impounded Rivers)。模型由河道径流模拟、闸坝调度过程模拟、河道水质模拟、区间入流及入河污染负荷估算和水质预警实时校正等5个模块组成。模型可服务于水环境实时预警和调度,也可为闸坝水文环境效应的量化提供基础工具。展开更多
文摘A wideband rectangular patch antenna resonat- ing at 3.5 GHz and 8 GHz frequencies is developed on a flexible substrate, which can be used for wearable applications. The proposed antenna gives a wide impe- dance bandwidth of 116%, operating from 2.SGHz to 9.5 GHz, covering most of the ultra-wideband （UWB） operating frequency range. A two-element multiple-input multiple-output （MIMO） system is developed using the proposed antenna, and the mutual coupling between the two antennas for various separations and frequencies is analyzed by using artificial neural networks （ANNs）. The neural structure is trained by using different ANN algorithms and a comparative study is made between them. It is shown that, quasi-Newton （QN） and quasi- Newton multi layer perceptron （QN-MLP） algorithms are better in terms of training, testing errors, and correlation coefficient.
文摘针对流域级闸控大型河网水环境日常管理的应用需求与实际特点,将资料适应性强的水文学方法与数据要求相对严苛的水动力-水质数值模型相融合,构建了一维与二维嵌套、分块组合的闸控大型河网水文-水动力-水质耦合数学模型DHQM(Hydrology,Hydrodynamics,and Water Quality Model for Impounded Rivers)。模型由河道径流模拟、闸坝调度过程模拟、河道水质模拟、区间入流及入河污染负荷估算和水质预警实时校正等5个模块组成。模型可服务于水环境实时预警和调度,也可为闸坝水文环境效应的量化提供基础工具。
