复杂媒质中聚集电极系响应的快速算法

利用高效的数值模式匹配方法（ＮＭＭ）求解二维轴对称介质的位场格林函数，并结合表面积分方程法来匹配球形聚集电极系上复杂的激励条件，圆满地解决了复杂介质中位场的分析，其数值结果与文献数据相吻合。本文还讨论了无源等位体对球形集电极系测井响应的影响。     

双电极有机聚合物热光器件的稳态热场分布

利用热传导学原理和有限差分法对有机聚合物热光器件热场进行了数值计算与分析，较详细的分析了双电极结构和不同热传导系数介质的温度场。双电极结构的温度分布比单电极易获得均匀分布，在等效热场作用下所消耗的功率较单电极小；下限制层采用高热传导系数的介质有利于温度场集中在波导区域，有利于提高开关速度。本工作为设计高效的有机聚合物热光器件打下基础。     

复杂非均匀介质中多偶极层激励的位场分析

本文利用半解析－半数值混合地复杂非均匀介质中单个和多个偶极层所激励的位场进行高效数值求解，并与有限元法结果及实验数据进行了对比验证，获得了满意的一致。该方法已被用于自然电位响应问题的精细建模与求解。     

直流电阻率测井的高效数值模拟:理论方法和应用

本文应用半解析半数值的高效分析方法,给出轴对称二维任意非均匀介质中位场格林函数的数值解,并利用表面积分方程匹配各种电极系不同的电位条件,从而获得具有轴对称激励的各种直流电阻率测井的视电阻率响应。通过与其他方法的数据对比,证明了本文方法的高精度和高效率.本文还简介了一些相关的应用成果。     

三电极全静电摄像管

磁聚焦静电偏转和静电聚焦静电偏转型摄像管具有图像失真小，分辨率高且均匀，电子束易于垂直上靶，阴影小等优点，所以受到人们的重视，但图案偏转电极的形状复杂，非对称场的计算较困难，本文对静电偏转型聚焦偏转系统的结构作了分析研究，运用分离变量法给出了圆柱坐标中静电聚焦（旋转对称）场和静电偏转（非旋转对称）场的解析解，讨论了静电聚焦静电偏转型聚焦偏转系统设计中有关电子轨迹的计算方法，最后给出了计算实例和Ｉｉ     

直流电阻率测井的高效数值模拟：理论方法和应用

本文应用半解析半数值的高效分析方法，给出轴对称二维任意非均匀介质中位格林函数的数值解，并利用表面积分方程匹配各种电极系不同的电位条件，从而获得了具有轴对称激励的各种直流电阻率测井的视电阻率响应。     

T矩阵方法计算双层球形粒子的受力

为了分析聚焦光束对多层粒子的捕获效率,结合矢量衍射积分、 T 矩阵方法以及Maxwell应力张量积分,通过理论推导给出了双层球形粒子的 T 矩阵的详细表达式,并对双层球形粒子在聚焦光场中的受力进行了数值计算,详细分析了内层折射率和内层尺寸对光场捕获效率的影响。结果表明,只有内层折射率在一定范围内,聚焦光束对双层球形粒子才具有捕获作用,随着内层折射率增加,最大后向捕获效率先增加后减小至零,对于空心粒子,内层尺寸越大,聚焦光束对粒子的捕获作用越弱,且平面波的捕获作用比高斯光束更强。此双层球形粒子的受力计算可以拓展到多层的复杂粒子的情形。     

一种高分辨率组合侧向电极系及其性能分析

为了解决电阻率测井仪的纵向分辨率和径向探测深度的矛盾。介绍了一种新型的高分辨率组合侧向电极系,并对其测井响应及性能进行了高效数值模拟。数值模式匹配方法是一种解析－数值混合方法,它使非均匀介质中的场的二维数值分析简化为一维数值分析和另一维的解析递推,从而大大了数值计算量。     

非接触式随钻地层压力测试方法

地层压力是保障安全钻井的重要参数,但要想准确地获取地层压力有很大的难度.本文从数字球形聚焦电极系出发,通过与钻杆的相互结合,形成一种以电极系为探测系统的电阻率测量系统,在随钻过程中测量泥浆侵入地层的径向深度,由压力平衡原理出发,结合井筒压力和泥浆侵入深度,给出了地层压力的计算方法.上述过程的关键问题是泥浆侵入深度的测量,论文在给出总体思路的同时,研究了数字球形聚焦电极系统的相关理论和实现方法.     

含曲面介质结构复杂目标电磁散射计算的射线追踪方法

针对含曲面介质结构的电大复杂目标电磁散射计算问题, 提出一种基于平面元网格模型曲率重构与射线密度归一化概念相结合的快速射线追踪方法.该方法通过曲率重构计算复杂目标表面的主曲率半径, 考虑从光疏介质到光密介质和从光密介质到光疏介质时电磁波照射凹凸曲面所具有的不同扩散或聚焦效应, 并利用射线密度归一化计算射线追踪过程中每一根射线对总散射场的贡献.当射线与介质表面的碰撞点位于焦散处时, 通过引入功率追踪成功克服了传统几何射线管在焦散处的奇异性.仿真结果验证了该方法的正确性和高效性.     

A collaborating colleague model for inducting internationalengineering students into the language and culture of a foreign researchenvironment

Practitioners of research in a particular field have extensive knowledge of how to operate successfully in that field and communicate effectively with others, within the boundaries of their own language and culture. However, when it comes to inducting novice researchers into these skills, difficulties are often encountered, and more so when the novice comes from a different language and cultural background. At the same time, specialists in English teaching or cross-cultural communication aiming to prepare novices to enter such a research environment often lack access to the details of how things are really done there. At The University of Adelaide, South Australia, this situation is being addressed through a new program for international postgraduate students in their first semester of enrolment. This Integrated Bridging Program (IBP) relies on collaboration between the discipline specialist researcher and language and learning specialists and is informed by the perspectives of systemic functional linguistics (SFL). This paper presents an overview of the IBP, followed by details of its operation in the Faculty of Engineering. Information is included on outcomes of the collaboration in specific instances, and how SFL theory has been applied to develop a flexible and effective induction which is highly valued by both staff and student participants     

Fat and hydration monitoring by abdominal bioimpedance analysis: data interpretation by hierarchical electrical modeling

In a previous publication, it was demonstrated that the abdominal subcutaneous fat layer thickness (SFL) is strongly correlated with the abdominal electrical impedance when measured with a transversal tetrapolar electrode arrangement. This article addresses the following questions: 1) To which extent do different abdominal compartments contribute to the impedance? 2) How does the hydration state of tissues affect the data? 3) Can hydration and fat content be assessed independently? For simulating the measured data a hierarchical electrical model was built. The abdomen was subdivided into three compartments (subcutaneous fat, muscle, mesentery). The true anatomical structure of the compartment boundaries was modeled using finite-element modeling (FEM). Each compartment is described by an electrical tissue model parameterized in physiological terms. Assuming the same percent change of the fat fraction in the mesentery and the SFL the model predicts a change of 1,24 omega/mm change of the SFL compared to 1,1 omega/mm measured. 42% of the change stem from the SFL, 56% from the mesentery and 2% from changes of fat within the muscle compartment. A 1% increase of the extracellular water in the muscle is not discernible from a 1% decrease of the SFL. The measured data reflect not only the SFL but also the visceral fat. The tetrapolar electrode arrangement allows the measurement of the abdominal fat content only if the hydration remains constant.     

自聚焦透镜的长度对斐索干涉仪面形测量的影响

讨论了自聚焦透镜的长度对自聚焦透镜斐索干涉仪面形测量的影响 ,给出了面形干涉图中相邻干涉条纹半径的平方差随自聚焦透镜长度和面形曲率半径变化的三维曲线、待测面 R→∞时的二维曲线以及自聚焦透镜的长度对面形测量范围的影响 ,并用平面作待测面给出实验值 ,验证了实验与理论的一致性     

复介质光量子阱光传输特性的增益效应

利用传输矩阵法,研究复介质光量子阱光传输特性的增益效应机制,结果表明复介质对光量子阱内部局域电场和分立共振透射峰的透射率均具有增益放大作用:复介质光量子阱与实介质光量子阱一样,内部也存在很强的局域电场以及透射谱中也出现分立的共振透射峰,但复介质光量子阱的内部局域电场和分立共振透射峰会出现增益放大现象。在光量子阱的组成介质A中掺入具有增益效应的激活性杂质时,光量子阱的内部局域电场首先随着激活性杂质含量的增加而放大增强,但增益放大到极大值后又开始衰减下降,而且不同入射光波长,光量子阱内部局域电场增益放大的极大值及其对应的激活杂质含量不同,其中对处于短波方向的光入射时内部局域电场对激活杂质含量的响应最灵敏最高,而且内部局域电场增益放大的极大值最大,对处于长波方向的光入射时内部局域电场对激活杂质含量的响应灵敏度最低,内部局域电场增益放大的极大值最小。复介质光量子阱光传输特性的增益效应机制,对新型光学滤波器、光学放大器和激光器等光学器件的理论研究与实际设计,以及光量子阱光传输特性的内在机制研究等,均具有积极的指导意义。     

介质覆盖导电球上缝隙天线的辐射

给出了用位函数方法推导介质覆盖导电球上缝隙天线辐射场严格解的过程.基于球Hankel函数加法定理,将基本磁流源激励的场展开为以球心为原点的球面波的叠加.利用球矢量波函数的定义及性质,提取出场的径向分量,将初级场分解为相对于径向的TE波和TM波,避免了复杂的矢量微分运算.在此基础上依据散射叠加原理,构造出各区域中场的一般表示形式,其中待定系数直接由球面分层介质中波的反射和透射规律给出.作为实际应用的例子,给出了介质覆盖导电球上均匀环缝问题的计算结果,并对结果进行了分析.     

Modeling low-frequency electrode-type resistivity tools in invadedthin beds

The authors formulate and implement a numerical mode-matching (NMM) method to model electrode-type resistivity tools in invaded thin beds. The authors derive the low-frequency approximation of the Maxwell's equations to obtain the partial differential equation for the potential field. The new NMM program is validated by comparing the numerical results with those obtained from other dc programs. It is found that this new program is much faster than the program using the finite-element method (FEM), and hence is useful for routine interpretation of resistivity logs and for inversion     

Simple pictograph for displaying complex field data in TEM celltissue sample

A simple diagram is described for displaying complex field data calculated using an original finite-difference time-domain algorithm. This polar plot is used to display field properties within a culture medium placed in a transverse electro-magnetic (TEM) cell, and shows the presence of an elliptically polarised exposure field with reactive phasing, arising from a plane wave incident field. The pictograph aids in comprehending this field behaviour, which may be relevant to any biological effects     

三层导电媒质中环天线的远区电磁场

快速准确地计算分层导电媒质中的环天线产生的电磁场一直受到人们的重视。由于这个问题常常涉及到Ｓｏｍｍｅｒｆｅｌｄ型积分的计算问题，因而是相当困难的。本文采用一种计算远场Ｓｏｍｍｅｒｆｅｌｄ型积分的新方法，结合复镜象理论，快速方便地得出了三层导电媒质中环天线远区场强的解析表达式。该方法可以很方便地推广应用到类似情况的远区场强的计算中去。     

基于声音识别的气味发生装置设计与实现

提出了一个以声音识别来取代画面识别为核心的气味发生控制系统,仿真体验现场气味：给出了声音的识别与控制电路;介绍了从特定构造的声音媒体中获得决定气味发生动作的气味数据的原理;给出了原理图、主程序框图。     

一种计算有耗媒质中跨界目标电磁散射的高效算法

为了克服传统离散复镜像法计算有耗媒质中索莫菲尔德积分的不足,提出了一种基于增强离散复镜像法的插值算法。当场点和源点位于分界面两侧时,谱域格林函数中同时包含场点和源点位置坐标,传统二级离散复镜像法无法一次拟合复指数参数,考虑将谱域核函数对场点坐标分离,然后建立复镜像参数随源点坐标的一维插值表,从而可以对复镜像参数进行插值运算;当场点和源点均位于有耗媒质中时,二级离散复镜像法的采样路径会带来错误,提出对谱域核函数进行形式变换再进行求解,从而使插值法适合有耗媒质中格林函数的计算;为了扩大传统二级离散复镜像法的横向计算距离,在对复镜像参数进行复指数级数拟合时,选择增强离散复镜像法的采样路径。该方法同传统对格林函数进行插值的方法相比,在计算复杂度降低的同时,效率和精度都获得了大大提高。