高频小信号单调谐放大器的分析与仿真

通过Multisim10.1软件对高频小信号单调谐放大器的仿真分析,观察到了发射极电阻的变化对单调谐回路频率特性的影响。利用实例证明:将Multisim10.1引入高频电路实验教学后,该软件能及时帮助学生理解课程内容、提高学生分析问题和解决问题的能力,Multisim10.1软件在"高频电子线路"课程教学改革中起着越来越重要的作用。     

使用不同频率域残差和K-SVD模型的图像消噪方法

图像消噪前后的残差信息包含图像的高频信息。为了提高消噪图像的质量,在轮廓波变换域内,根据噪声图像及其K-SVD消噪后不同频率子带图像的残差信息,对残差子图像块再次进行K-SVD消噪,并将其结果与消噪图像的子带图像进行融合,得到包含残差信息的消噪子带图像,最后通过轮廓波逆变换得到消噪图像。仿真实验结果证明了所提出的基于不同频率子带内残差信息和K-SVD的图像消噪方法优于轮廓波变换和K-SVD模型,具有较好的消噪性能。     

Training and learning by using the Microwave Office program for designing high frequency and microwave circuits

This paper presents a detailed planning for a high frequency or microwaves laboratory based on microstrip techniques and also on the use of a CAE commercial software. In the second part of the article we justify the use of the so-called Microwave Office software because of its easy handling and learning, which make it, in the authors' opinion, a good tool for correct learning of the circuits with microstrip techniques and, therefore, of the proposed educational programme.     

Effects of surface finish and treatment on the fatigue behaviour of vibrating cylinder block using frequency response approach

INTRODUCTION Due to market pressures for improvements in productivity, reliability, ductility, wear resistance and profitability of mechanical systems, manufacturers are placing increasing demands on available materials.Economic constraints require that these materials are inexpensive and easily available. In order to enhance the surface properties of today’s materials, producers of components are turning to different surface finish and treatments. There are several techniques available …