利用级数展开的Z扫描理论分析

利用级数展开的方法，对薄介质的Z扫描理论进行了分析，并对于通常所采用的级数展开和菲涅耳衍射分析方法进行了讨论，证明了在分析利用高斯光束对薄介质进行Z扫描测量时，即使对于大的非线性相移，高斯分解方法和菲涅耳衍射积分方法仍具有等效性，澄清了人们认识上的一些误解。同时分析了远场小孔的归一化透射率与积分限的关系，并对采用高斯分解方法时级数求和的振荡原因进行了分析和讨论，给出了消除振荡所需的最小求和数的判据。针对高斯分解方法和菲涅耳衍射积分方法的使用场合，也进行了讨论。根据所得结论，可以在具体的实验和理论分析中，正确地选择更高效的分析方法。     

串级结构Z扫描特性的分析

对非线性介质串级结构的Z扫描特性进行了分析，分别给出了解析解和数值解. 解析分析主要是基于高斯分解方法（GDM）和分布透镜方法的组合；数值分析采用了Crank-Nicholson有限差分方法和快速汉克尔变换方法(FHT). 同时，也给出了这两种数值分析的使用条件和方法. 将解析结果、数值结果和实验结果进行了比较，结果显示它们具有很好的一致性. 关键词： 串级结构 Z扫描 有限差分方法 快速汉克尔变换     

运动光栅的量子特性研究

讨论了空间周期结构和时间周期性对波和物质波的作用，即动量和能量的量子化变化，并用傅里叶分析和相对论的方法对其进行了分析论证，提出了一种对于运动和物体相互作用在概念上的处理方法。     

中低合金钢中五害元素（Pb,Sn,As,Sb,Bi）的光电光谱分析…

应用日本岛津ＰＤＡ－５０１７真空发射光谱仪，测定了中低低合金钢中的五害元素，对分析条件进行了选择和确定，并讨论了分析结果和影响因素。本方法具有操作简便，分析速度快，准确度高，成本低等优点，在炉前快速分析与石油管材 取得较好的效果。     

同轴线方法测量束流耦合阻抗的有效性分析

 根据同轴线方法测量阻抗的原理，用模拟方法讨论了该测量方法的有效性问题。从均匀圆波导和同轴线结构中的电磁场解析分析，说明了该方法有效性问题的起源和基本物理图像，简单回顾其他方法讨论该问题的结论，最后数值模拟分析了同轴线方法测量束流耦合阻抗的有效性，所得主要结论能够对阻抗测量平台的设计提供可靠的依据。     

142.8MHz次谐波聚束腔的结构优化设计

 使用二维有限差分法分析软件Superfish和三维有限积分法分析软件MAFIA，对142.8MHz次谐波聚束腔的结构进行了模拟和优化研究，给出了聚束腔结构优化设计的步骤和方法，确定了优化后聚束腔的基本结构。分析比较了Superfish和MAFIA两个软件的模拟优化结果，得出了基本一致的结论。还探讨了Superfish和MAFIA在聚束腔设计中的应用方法。     

非实体曲线的测量方法探讨

本文以曲线套筒为例，论述了非实体曲线测量原理和方法，并对其误差进行了分析，提出了改进方法。     

电流表的温度补偿

分析了电流表的温度误差现象，简要介绍了串联可变电阻补偿方法和相同材料电阻补偿方法，重点叙述了3NTC热敏补偿法的实验原理、实验方法，并给出了测量结果．     

FAAS法同时测定工业氧化镁中杂质元素钙,铁,锰的研究和应用

本文就火焰原子吸收法测定工业氧化镁中杂质元素钙，铁和锰的条件进行了试验，对基体元素的影响和消除方法进行了探索。所建立的方法应用于工业氧化镁产品中的铁，钙和锰的分析，结果与国家标准方法分析结果相比较，经统计检验，两者无显著性差异。相对标准偏差钙为１．４１％，铁为３．２０％，锰为０．９６％。方法简便，快速，准确，可用于工业氧化镁产品的质量检验。     

Kalman滤波技术在电感耦合等离子体原子发射光谱分析中的应用

本文研究了Ｋａｌｍａｎ滤波技术在电感耦合等离子体原子发射光谱分析中的应用。以０．３２０ｍｇ／ｍｌ氧化铽中微克级镧，铕，钆，镝，铒和铥的测量为例具体叙述了方法，并提供实用计算机程序，为校正光谱干扰提出了一实用方法。该方法无需化学分离富集，直接分析光谱干扰严重的样品。     

光纤光栅传感信号解调技术研究进展

光纤光栅传感器是一种新型传感器,有着非常广泛的应用前景。限制光纤光栅传感器大量实际应用的主要障碍是传感信号解调,因而,光纤光栅传感信号解调是光纤光栅传感器应用的关键技术之一。本文对现有已报道的光纤光栅传感信号的解调方法进行综述,并归类为:边缘滤波法、匹配滤波法、可调谐滤波法、光源波长可调谐扫描法、射频探测法、光栅啁啾法、CCD分光仪法、干涉法。对各种方法的原理及相关改进方法进行了阐述,并对其优缺点做了比较分析,最后,对光纤光栅传感信号的解调技术发展进行了展望。     

Automatic method of fruit object extraction under complex agricultural background for vision system of fruit picking robot

Fruit picking robot is required for agricultural automation for fruit harvest, and vision system is the important and crucial composition of a robot system. An automatic extraction method of fruit object under complex agricultural background for vision system in fruit picking robot is presented in this study. The method is based on an improving Otsu threshold algorithm using a new feature in OHTA color space. Color features are extracted in OHTA color space and then used as an input for the Otsu threshold algorithm which calculates the segmentation threshold value automatically. Four kinds of fruit images are selected to validate the automatic extraction method. The fruit objects are automatically extracted with this method and the outputs are presented in binary images. Numerous of experiments show that the automatic extraction method can extract mature fruit from complex agricultural background and the extraction accuracy is more than 95%. The results indicate an effective fruit object extraction method for vision system of fruit picking robot.     

基于色貌的跨媒体颜色复制

介绍了一种基于视觉匹配的跨媒体颜色复制方法。通过视觉匹配将一个环境下的一些色貌因素"映射"到另一个环境,是一种基于色貌的CRT特性化方法。该方法复制的22个Munsell色卡的平均视觉评价为6分制的5.17分。其中,红色调的复制色块视觉评价较好,蓝色调或蓝色占有较大比例的复制色块误差较大。sRGB作为目前流行的用于颜色通讯的标准色空间,在实验中也进行了比较。实验证明这种基于视觉匹配的特性化方法,已经包含了一些色貌因素,可以满足一般的应用要求,有着广泛的应用前景。     

Determination of transmission and insertion loss for multi-inlet mufflers using impedance matrix and superposition approaches with comparisons

This paper details how transmission and insertion loss can be defined for the multi-inlet case. Two different procedures are used for calculations and are compared against one another. The first is an impedance matrix method that has been proposed in the past and is especially suitable for deterministic approaches like the boundary element method. The other is a superposition method that does not require assembling or inverting a matrix. Though each method can be extended to the n-inlet situation, the superposition approach is mathematically simpler but requires the source impedance to be known a priori. Transmission and insertion loss can be determined using either method, and results using both are shown to be equivalent. The methods are demonstrated and compared for a two-inlet one-outlet expansion chamber. After which, the superposition method is used to determine the insertion loss for a two-inlet one-outlet generator set muffler experimentally.     

基于分数阶傅里叶变换的光学加密影片

随着通信与网络的快速发展,能够包含大容量信息的影片得到了广泛应用。利用分数阶傅里叶变换的特点,提出了一种全光学加密解密影片的方法。将现有的影片加密密钥从二重变为了四重,显著增加了影片的安全性。通过改变振幅型正弦光栅的作用位置,将影片的加密解密次数由现有的每帧各一次减小为总共一次,优化了算法。仿真结果验证了该方法的有效性。     

线束干扰响应的精简计算模型

将电缆束等效方法与传统的传输线方法相结合,提出了多芯电缆束的精简SPICE分析模型。首先采用有限元法求解等效电缆束的模型参数,然后在SPICE环境中进行时域分析。以14芯电缆束的串扰问题和4芯电缆束的辐射干扰问题为例,对精简分析模型的有效性进行了验证。全模型与精简模型分析结果表明,精简模型线缆芯线数减少了一半以上,仿真幅度误差在5%以内,分析效率提高50%以上。该方法适用于大线束传导耦合分析、串扰分析和辐射分析。     

A perturbation solution to generalized linear Boltzmann equation

A perturbation method to solve the generalized linear Boltzmann equation is presented for the calculation of dynamic conductivity of a normal metal at low temperatures. The method is applied to the ordinary Boltzmann equation. The following three cases are considered: i) when only electron-impurity interactions are dominant, ii) when the metal may be considered as pure plasma, and iii) when both of the interactions are present. The expressions for conductivity are presented in the binary collision approximation. The connected diagram expansion method is extended for the direct calculation of the conductivity. Finally the method is extended for the calculation of conductivity by the correlation function formula.     

The dimension splitting element-free Galerkin method for 3D transient heat conduction problems

By transforming a 3D problem into some related 2D problems, the dimension splitting element-free Galerkin(DSEFG) method is proposed to solve 3D transient heat conduction problems. The improved element-free Galerkin(IEFG) method is used for 2D transient heat conduction problems, and the finite difference method is applied in the splitting direction. The discretized system equation is obtained based on the Galerkin weak form of 2D problem; the essential boundary conditions are imposed with the penalty method; and the finite difference method is employed in the time domain. Four exemplary problems are chosen to verify the efficiency of the DSEFG method. The numerical solutions show that the efficiency and precision of the DSEFG method are greater than ones of the IEFG method for 3D problems.     

Numerical method satisfying the first two conservation laws for the Korteweg–de Vries equation

In this paper, we develop a finite-volume scheme for the KdV equation which conserves both the momentum and energy. The main ingredient of the method is a numerical device we developed in recent years that enables us to construct numerical method for a PDE that also simulates its related equations. In the method, numerical approximations to both the momentum and energy are conservatively computed. The operator splitting approach is adopted in constructing the method in which the conservation and dispersion parts of the equation are alternatively solved; our numerical device is applied in solving the conservation part of the equation. The feasibility and stability of the method is discussed, which involves an important property of the method, the so-called Jensen condition. The truncation error of the method is analyzed, which shows that the method is second-order accurate. Finally, several numerical examples, including the Zabusky–Kruskal’s example, are presented to show the good stability property of the method for long-time numerical integration.