长波长1.3μm超辐射发光管的制备

对半导体激光器腔面分别蒸镀单层和双层减反射膜（ＡＲ）制备超辐射发光管（ＳＬＤ），测试了器件功率特性、光谱特性和远场分布，并计算了器件端面的剩余反射率。     

星载SAR辐射定标误差分析及成像处理器增益计算

本文对星载ＳＡＲ辐射定标的各项误差因素进行了分析,提出了计算辐射定标误差的公式,提供了分配星载ＳＡＲ系统辐射定标误差的工具;对基于ＣＳ算法的成像处理器的增益计算公式进行了推导,并通过计算机仿真得到了验证;定量地分析了成像处理器增益计算误差对ＳＡＲ系统辐射定标精度的影响。     

有耗介质中单极天线的场分布和SAR图

用一段刚性同轴线制作的微细单极天线在医疗上已得到广泛应用。本文给出了单极天线在有耗介质中的近场分布的数值解，进而在有耗介质中测定了温度分布和ＳＡＲ图，利用近场分布计算的ＳＡＲ图和测定的ＳＡＲ图基本相符。     

有耗介质中单极天线的场分布和SAR图

用一段刚性同轴线制作的微细单极天线在医疗上已得到广泛应用。本文给出了单极天线在有耗介质中的近场分布的数值解，进而在有耗介质中测定了温度分布和ＳＡＲ图，利用近场分布计算的ＳＡＲ图和测定和ＳＡＲ图基本相符。     

空载合成孔径雷达技术及展望

空载合成孔径雷达（ＳＡＲ）是一种现代高分辨率侧视成象雷达，它应用合成孔径技术、脉冲压缩技术和数字信息处理技术，获得方位向和距离向的高分辨率。本文将对空载ＳＡＲ的现状及发展趋势进行综述，并主要讨论ＳＡＲ的有关技术，涉及星载ＳＡＲ工作模式和体制，雷达数字图象的信息获取与成象处理等，最后，给出了ＳＥＡＳＡＴ－Ａ卫星ＳＡＲ数字成象结果。     

星载合成孔径雷达（SAR）成像处理快速近似算法

本文研究了一种用于星载ＳＡＲ方位处理的快速算法，称为ＳＰＥＣＡＮ算法。该算法与常规的频域算法相比较，，在计算量，存贮量和算法结构上都有明显的优势。它可作为星载ＳＡＲ粗处理的实时处理算法，对星载ＳＡＲ实时成像处理具有重大意义。本文关重研究了ＳＰＥＣＡＮ算法的结构及其在星载ＳＡＲ中所需解决的特殊问题。最后，利用ＳＥＡＳＡＴ－Ａ海洋卫星ＳＡＲ原始数据验证了该算法的可行性。     

复杂电磁环境与两个体的相互作用研究

在复杂环境中单个人体的电磁场分布以及ＳＡＲ计算的比较多，而对多个人体的相互作用以及之间的相互影响研究较少。利用现有的方法，计算在一定条件下，两个体的相互作用，将其计算的结果与单个体存在的情况下的结果相比较由比较了可以得出结论，平面波入射情况下，两个人体存在时的多层ＳＡＲ与单个体的分层ＳＡＲ相比差别较小，且比单个人体存在时要小一点。     

抗高能单粒子辐射加固的LC6508电路的研制

本文介绍抗单粒子辐射加固的１ＫＣＭＯＳＳＲＡＭＬＣ６５０８电路，对该电路进行了单粒子辐射试验，并就试验结果进行了讨论。     

SRAM在激烈竞争中开拓新市场

静态随机存取存储器（ＳＲＡＭ）的市场情况与一年前已大不一样。去年夏天，为满足需求，特别是对用于个人计算机中的二级超高速缓存的需求，ＳＲＡＭ制造厂商拼命地扩大生产能力。多种ＳＲＡＭ的价格居高不下，使去年的销售额猛增６２％。至去年底，景气的泡沫开始破灭。由于许多公司其中有不少台湾公司，同时进入超高速缓存ＳＲＡＭ市场，加之ＰＣ制造厂商并不都采用超高速缓存ＳＲＡＭ，从而导致供需严重失衡，价格骤降，一个１兆位ＳＲＡＭ的售价在６个月内从３０美元降至４美元，使许多做ＳＲＡＭ生产的人无利可图。激烈的竞争ＳＲＡＭ…     

SAR图像基于Rayleigh分布假设的最小误差阈值化分割

针对合成孔径雷达（ＳＡＲ）图像的特点，本文提出基于灰度直方图的混合偏移Ｒａｙｌｅｉｇｈ分布假设下的最小误差阈值化分割算法，并与现有的基于Ｇａｕｓｓ和Ｐｏｉｓｓｏｎ分布假设下的最小误差分割算法以及经典的Ｏｔｓｕ算法作了比较。实验和Ｋｏｌｍｏｇｏｒｏｖ－Ｓｍｉｒｎｏｖ检验结果表明对ＳＡＲ图像而言，基于Ｒａｙｌｅｉｇｈ假设的算法可以取得更好的分割效果。     

Electromagnetic and thermal models of a water-cooled dipoleradiating in a biological tissue

An insulated, water-cooled dipole, radiating in a biological tissue, is analyzed with a theoretical electromagnetic and thermal model. The SAR and temperature distributions are calculated taking into account the effect of the water flowing inside the applicator. The steady-state temperatures in a dissipative medium, interacting with the dipole, are evaluated for several thicknesses of the external casing, water temperatures and blood perfusions. A correct design of the external casing thickness and a proper choice of the temperature and flow velocity of water allows to control the wall temperature of the applicator within physiological limits. The influence of the blood perfusion on the temperature distribution is investigated.     

FDTD electromagnetic and thermal analysis of interstitialhyperthermic applicators

The electromagnetic and thermal behavior of interstitial applicators was analyzed by using the finite-difference time-domain method. Two configurations were considered: a simple insulated dipole antenna radiating in a layered tissue, and an air cooled applicator radiating in a tissue-equivalent phantom. The proposed approach allows a detailed modeling of the complete structure of the applicator. Furthermore, specific absorption rate and temperature distributions can be determined considering real clinical or experimental conditions. The temperature distribution for the air cooled applicator has been compared with experimental results     

热疗用微波辐射器长度对其性能影响的理论分析

本文分析了一种带冷却水的用于人体体腔内部热疗的绝缘偶极子微波辐射器的特性。利用辐射器上的电流分布导出辐射阻抗和驻波经与辐射器长度的关系式，探讨了体腔周围被加热生物组织中分布的比吸收率，进而根据热平衡方程得到辐射器长度对温度场分布的影响，为体腔内部热疗用微波辐射器的设计提供了理论依据。     

A Coaxial Microwave Applicator for Direct Heating of Liquids Filling Chemical Reactors

A coaxial microwave applicator radiating in a liquid medium contained inside a chemical reactor is described. The applicator consists of an insulated asymmetrical dipole antenna that radiates almost isotropically. Hence, it appears well suited to directly heat the medium that fills the vessel, making it unnecessary to use a microwave oven as currently done in microwave assisted chemistry. The electromagnetic (EM) properties of the insulated dipole antenna emitting in high permittivity lossy media are first reviewed to define the applicator design criteria. A 3-D numerical EM solver is then employed to analyze the radiation of the applicator in the surrounding medium taking into account the whole structure of the reactor. Safe operations are always assured by the proper design of the applicator-vessel mechanical connection that drastically reduces unwanted stray radiation. The agreement between the theoretical analysis and the experiments performed is good, thus confirming that the coaxial applicator compares favorably with the traditional methods of activation, which use a single or multimode resonant EM cavity.     

The calculated and measured temperature distribution of a phasedinterstitial antenna array [invasive applicators]

The power deposition pattern of four antennas, positioned on the corners of a 2-cm square array with different driving phases, is computed under the assumption of negligible coupling between the antennas. The spatial SAR (specific absorption rate) distribution is calculated by modeling each interstitial applicator as an insulated, asymmetric dipole. For comparison with the heating patterns measured by a thermal video system, the calculated SAR distributions are converted into temperature patterns through an electric network simulation of the heating in artificial muscle tissue. At each nodal point of a grid in the thermal system, the absorbed microwave power (or SAR times density), thermal resistivity, heat capacitance, and temperature are simulated, respectively, as current source, electrical resistance, electrical capacitance and potential. Therefore, solving the equivalent electric network on a computerized simulation routine (SPICE) yields the temperature distribution. In both the axial and transverse planes, the resulting temperature distributions from the antenna array, with various driving phases, agree very well with the measured temperature patterns     

An insulated dipole applicator for intracavitary hyperthermia

Specific absorption rate (SAR) patterns for an insulated sleeve dipole applicator, operating at 433 MHz, were measured by infrared thermography. The applicator was modeled using classical transmission-line theory, and experimental and theoretical results were compared. In general, agreement between measured and calculated SAR values was good. However, at the antenna feedpoint, the measured values were appreciably higher than the calculated values. This indicates that inclusion of junction effects would improve the model     

Analysis of the SAR distributions in three-layered bio-media in direct contact with a water-loaded modified box-horn applicator

This paper presents theoretical analysis of the specific absorption rate (SAR) distribution in three-layered bio-media (skin, fat, and muscle layers) in direct contact with a modified box-horn applicator in which the horn is flared in both the E- and H-planes for hyperthermia treatment of cancer. The modified box-horn is assumed to be filled with water to provide a better impedance match to the bio-media. The present analysis is based on a plane-wave spectral technique. The spatial distribution of SAR in skin, fat, and muscle layers are computed and presented at 433 and 2450 MHz. Higher SAR value in each of the bio-layers, higher penetration depth, and lower resolution in the muscle layer are observed at 433 MHz in comparison to those at 2450 MHz for the water-loaded modified box-horn. The effect of substituting a pyramidal horn in place of an H-plane sectoral horn in the design of the box-horn on the SAR distribution is also examined. The results have been validated against published results in the literature.     

Synthesis of a circular polarized field radiated by an electric dipole located over a rectangular screen

A radiating system consisting of a rectangular perfectly conducting screen and an oblique electric dipole is considered. An algorithm taking into account diffraction by the edges of the screen is developed for determination of the dipole’s slope angle such that the radiated field is circularly polarized in the principal observation planes. The effect of the dipole position relative to the screen on the polarization properties and gain of the system radiating a circularly polarized field is investigated. It is shown that these characteristics exhibited in a given direction can be optimized through selection of the dipole’s position and slope angle.     

The determination of the electromagnetic field and SAR pattern ofan interstitial applicator in a dissipative dielectric medium

The spatial distribution of microwave energy absorbed per unit mass (the specific absorption rate or SAR) in biological tissue is calculated for a class of interstitial antennas. The insulated interstitial applicator is simulated as an asymmetrically drive antenna. An expression for the electric field intensity near the antenna is derived and calculated by direct numerical evaluation of a surface integral over the insulation. The predicted SAR patterns obtained using the calculated electric field intensity and the tissue conductivity agree very well with the measured SAR distributions around three different applicators in muscle-equivalent phantoms