双反射光学系统的I0环/I0孔的研究

从夫琅禾费积分公式出发 ,论述了双反射光学系统的I0环 I0孔 的测定原理和检测方法。并通过精确测试取得了一系列有实用价值的数据。     

线性啁啾变迹及均匀光纤光栅的反射谱分析

该文从理论上研究了线性啁啾变迹光纤光栅及均匀光纤光栅的反射谱，经分析发现，高斯分布的耦合系数具有平滑反射谱，消除旁瓣的作用，啁啾系数的增大使得光栅的反射谱明显变宽，最大反射率降低，利用这个规律，可选择恰当的参量，制作出符合工程要求的光纤光栅，同时也发现均匀“弱”光纤光栅的反射谱具有sa(x)函数的分布特性，在此基础上提出用“弱”光纤光栅做匹配光滤波器的设想。     

积分球反射法测量铌的发射率随温度的变化

提出了一种利用积分球反射法的脉冲加热技术测量材料热物性的方法，在此基础上研制了脉冲加热瞬态热物性测量装置，给出了利用该装置测量的铌在632．8nm波长下法向光谱发射率随温度的变化曲线，并进行了讨论。结果表明，所研制的装置能同时测量带状试样的比热、电阻率、全波长半球发射率及法向光谱发射率，具有试样制备简单、测试精度高等优点。     

单位球上的λ-分布

λ－性质是研究空间的单位球端点分布的性质，给出了关于性质公开问题的肯定和否定的回答，证明了如果X具有λ－性质，那么l1(X)具有λ－性质，但是某些l∞（X）没有λ－性质。     

髋臼骨折的CT诊断价值(附89例分析)

目的：评价CT在髋臼骨折中的诊断价值。方法：回顾分析89例髋臼骨折的CT检查并与X线平片相比较。结果：CT检查在髋臼骨折分型诊断、关节腔内游离碎骨片等方面优于X线平片。结论：CT是全面评价髋臼骨折的必要手段，其总体效能优于X线平片。     

使用IEEE802.1X技术优化校园网计费管理

通过对IEEE 80 2 .1X技术的认证计费系统的分析 ,论述如何用其解决校园网计费管理中现存的问题 ,优化校园网的计费管理     

Vibration Analysis of Digital Radiography System for Large Container Inspection

The cantilever vibration characteristics of a digital radiography system were analyzed to predict the effect of vibration on the performance of a mobile container inspection system. The static deformation,vibration mode and natural frequency of the cantilever of the digital radiography system were calculated with the ALGOR Finite Element System to verify the strength and rigidity of the cantilever. The maximum amplitude of the cantilever vibration occurs as it starts accelerating. The predictions show good agreement with test results, indicating that the finite element model of the cantilever structure accurately models the mechanical characteristics.     

Classification of Medical Brain Images

Since brain tumors endanger people‘s living quality and even their lives, the accuracy of classification becomes more important. Conventional classifying techniques are used to deal with thosedatasets with characters and numbers. It is difficult, however, to apply them to datasets that include brain images and medical history (alphanumeric data), especially to guarantee the accuracy.For these datasets, this paper combines the knowledge of medical field and improves the traditional decision tree. The new classification algorithm with the direction of the medical knowledge not only adds the interaction with the doctors, but also enhances the quality of classification. The algorithm has been used on real brain CT images and a precious rule has been gained from the experiments. This oaoer shows that the ahzorithm works well for real CT data.     

身份认证技术研究

在安全的网络通信中，通信各方必须通过某种形式的身份验证机制来证明他们的身份，以验证用户的身份与所宣称的是否一致，才能实现对不同用户的访问控制和记录。文章讨论了两种常用的身份认证机制，并对其安全性进行了分析。     

基于小波分析的X线医学图像噪声综合抑制方法

提出了一种基于小波分析理论的医学X线图像噪声的综合抑制方法．将X线图像的试验处理结果与邻域平均、中值滤波去噪处理方法进行对比分析，结果表明该方法不仅能消除噪声提高图像质量，而且有效地保留了影像中丰富的细微影纹和边缘信息．