纳米尺度金属薄膜在拉伸状态下的稳定性

将薄膜和基底作为一个基本结构来研究薄膜的变形和损坏可预测纳米薄膜器件的使用寿命.本文讨论和研究了薄膜基底结构在拉伸载荷下薄膜出现的分叉和断裂的过程.用在相同厚度的PET基底上沉积不同厚度铝膜的薄膜基底结构作为试件,分别对薄膜厚度为100,150和200 nm的3种不同试件进行了拉伸加载实验,并在OLYMPUS显微镜下观...     

基于组合模型的风电机组轮毂载荷预测方法研究

载荷评估对风电机组运行安全性和经济性有重要影响.鉴于采用FAST和GH bladed等软件不适用于短期风电机组载荷评估,利用实测数据和神经网络原理,建立GA-BP、PSO-ELM、BP-ELM-GRNN组合模型,对轮毂载荷开展短期预测,并与实测数据进行对比.该组合模型采用遗传算法优化BP神经网络的权值阈值,粒子群算法优...     

A wideband on-chip millimeter-wave patch antenna in 0.18 μm CMOS

A wideband on-chip millimeter-wave patch antenna in 0.18 μm CMOS with a low-resistivity(10Ω·cm) silicon substrate is presented.The wideband is achieved by reducing the Q factor and exciting the high-order radiation modes with size optimization.The antenna uses an on-chip top layer metal as the patch and a probe station as the ground plane.The on-chip ground plane is connected to the probe station using the inner connection structure of the probe station for better performance.The simulated S11 is less than –10 dB over 46–95 GHz,which is well matched with the measured results over the available 40–67 GHz frequency range from our measurement equipment.A maximum gain of –5.55 dBi with 4% radiation efficiency at a 60 GHz point is also achieved based on Ansoft HFSS simulation.Compared with the current state-of-the-art devices,the presented antenna achieves a wider bandwidth and could be used in wideband millimeter-wave communication and image applications.     

A wideband on-chip millimeter-wave patch antenna in 0.18/Lm CMOS

A wideband on-chip millimeter-wave patch antenna in 0.18 μm CMOS with a low-resistivity （10 Ω.cm） silicon substrate is presented. The wideband is achieved by reducing the Q factor and exciting the high-order radiation modes with size optimization. The antenna uses an on-chip top layer metal as the patch and a probe station as the ground plane. The on-chip ground plane is connected to the probe station using the inner connection structure of the probe station for better performance. The simulated S11 is less than -10 dB over 46-95 GHz, which is well matched with the measured results over the available 40-67 GHz frequency range from our measurement equipment. A maximum gain of-5.55 dBi with 4% radiation efficiency at a 60 GHz point is also achieved based on Ansofi HFSS simulation. Compared with the current state-of-the-art devices, the presented antenna achieves a wider bandwidth and could be used in wideband millimeter-wave communication and image applications.     

基于相关向量信息熵的风电机组功率曲线构建方法研究

仿真研究湍流强度、空气密度、偏航误差等风电机组功率输出特性关键影响因素与功率曲线之间的内在关联特性,建立各影响因素与功率输出特性之间的隐含关系子模型。结合风电机组运行数据,基于相关向量信息熵技术,实现风电机组运行功率曲线的构建。基于构建的功率曲线与机组实际输出特性开展年发电量对比,结果表明,基于相关向量信息熵法构建的功率曲线能够实现对风电机组出力特性的真实准确评价,评价误差不超过2%。