便携式微波肉类含水量测试仪

采用微波功率比法进行微波衰减量测量原理,制成一种可现场对样品迅速完成计测的便携式肉类含水量测试仪。肉类含水量的多少与微波衰减量的大小有关     

应用光纤技术在线检测刀具的磨损

以光纤传导理论为基础，提出了一种新的非接触式刀具磨损检测方法——光纤反射位移检测法．该法以激光为光源，以光纤传感器为检测手段，以刀杆振动位移为检测对象来实现对刀具状态的跟踪检测．大量的切削实验表明了这种方法的适用性和可靠性     

波导隔离器用Ce：YIG磁光薄膜的制备

波导隔离器用Ｃｅ：ＹＩＧ磁光薄膜可由溅射外延或溅射沉积后热处理结晶化两种方法制备。控计了制备过程中不同工艺条件对薄膜结晶性能及磁光特性的影响．     

渐变型波导模方程的计算方法

本文对渐变型波导的模方程,进行严格的推导,得到解析表达式,从而给出了数值求解的方法。用结果可以直接计算出膜层的厚度,有效折射率值,表面折射率及折射率的最大差值。     

z传Ti:LiNbO_3M-Z型调制器

我们在z传LiNbO_3基片上设计、制作了M-Z(Mach-Zehnder)型电光调制器.理论和实验表明,它可以实现与偏振无关的调制.     

低折射率耦合层半导体激光器模式特性的分析

本文讨论了几何参量和光学参量对具有低折射率耦合层半导体激光器垂直结方向模式的影响,对器件制做时参数的选取提供了理论上的依据.     

指纹图像预处理和特征提取算法的Matlab实现

在指纹识别中,作为指纹匹配的前提和基础,指纹图像的预处理和指纹图像的特征提取对整个指纹识别算法起着至关重要的作用。本文设计了一套指纹图像预处理和指纹特征提取算法,利用方向滤波的方法对原始图像进行增强,使用改进的细化算法进行细化,最后基于脊线跟踪的方法,用改进的算法更为简洁而有效地避免了各种伪特征。设计的算法经Matlab实现,实验效果良好。该算法为指纹识别进一步应用到实际提供了一定的技术基础。     

岭回归建模分析针对促进社会主义新农村经济发展的应用——以四川省南充市xx区为例

大力发展社会主义新农村的建设一直是国家高度重视的问题。该文首先分析了影响农村经济飞速发展的因素,然后针对《南充市嘉陵区关于对社会主义新农村的问卷调查》进行分析,根据岭回归理论并结合当地的实际情况,对水果总收入、生猪总产值、粮食作物总收入等9个方面进行岭迹分析,剔除了不相关因素,建立了合理的岭回归模型,并对农村经济如何促进稳健发展提出建议。     

Three-dimensional simulation of a nanophotonics device with use of fullwave software

Using the FullWAVE software (www.rsoftdesign.com) that implements the finite-difference FDTD-method of solving Maxwell’s equations, we simulate the performance of a three-dimensional nanophotonics device comprising a sub-wavelength diffraction grating, a wide and a narrow planar waveguide, and a photonic crystal (PhC) Mikaelian lens located in a thin silicon film coated on a substrate containing a three-period Bragg mirror, with each period made up of silicon + silica layer. The device is intended to couple a focused laser beam with the focal spot of 3 × 4.6 μm² and wavelength 1.55 μm into a planar waveguide of width 500 nm, resulting in a 125-fold “compression” of the input beam cross-section. The modeling has shown that the coupling efficiency amounts to 32% of the energy of the linearly polarized elliptic Gaussian beam focused onto the grating and 52% when a plane wave segment is incident onto the grating. For comparison, the grating-unaided coupling of light into the same device by the butt-coupling of light into the wide waveguide’s silicon film gives the efficiency as low as 8%. The article is published in the original.     

A novel technique for the direct determination of multimode equivalent circuit models for substrate integrated waveguide discontinuities

A novel technique is presented for the automatic, self‐consistent and direct determination of wide‐band lumped‐element equivalent circuit models of substrate integrated waveguide discontinuities. This technique is based on the full‐wave analysis of substrate integrated waveguide components by using the Boundary Integral‐Resonant Mode Expansion method, which provides a generalized admittance matrix of the components in the form of a pole expansion in the frequency domain. This expression of the admittance matrix permits to directly identify the topology of a multimodal equivalent circuit and the values of its lumped elements, thus avoiding any initial guess or fitting procedure. The basic theory of the full‐wave analysis method and the procedure for determining the equivalent circuit model are reported. The features of the proposed technique are detailed through the modeling of an iris‐like discontinuity. Moreover, this technique is validated by modeling substrate integrated waveguide filters, whose frequency response is compared with numerical and experimental results. The proposed method can be adopted to obtain libraries of parametric models of substrate integrated waveguide discontinuities, which can be included in computer aided design tools. The multimodal parametric model of an iris‐like discontinuity is presented and discussed. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009.