利用PowerBuilder开发数据库比较软件

数据库开发项目中对于数据库信息、数据库内用户表的信息及结构常常由于系统升级、结构变化，遇到数据库之间需要比较的问题，针对所比较特性分析，运用目前颇为流行的数据库客户端开发工具Power Builder，根据其多态性、可封装性和继承性，提高所开发应用系统的可重用性、扩展性，结合独特的数据窗口技术与多事务对象、动态游标、动态数据窗口等的开发技巧和常用方法，分析其实用性。     

四种飞行目标作用距离及散射面积

测量雷达作用距离时通常对应于特定的配试目标。不同配试目标的雷达截面(RCS)会随着视角、工作波长、姿态等因素变化而变化。目标RCS的测量方法有多种，通过动态检飞得到的RCS应该是最可靠的。该文利用对某雷达外场检飞数据，对某民航机、某战斗机、某直升机、某小型教练机四种飞行目标在UHF波段的最大作用距离和RCS进行了估算分析。     

省级广播电视中心的系统结构设计

本文旨在探计省级广播电视中心的系统结构设计。为了充分发挥广播电视中心的功能,减少信号流通环节,提高节目播出的可靠性,提出了以播出为中心的单系统三层结构的设计方案。     

γ射线辐照石英玻璃吸收光谱的研究

石英玻璃以其低热膨胀系数、高紫外透过率而成为不可缺少的光学材料,但并不是所有的石英玻璃都可以作为光学材料。有些石英玻璃在短波长射线环境运行一段时间后,透过率下降,甚至变黑。哪些石英玻璃能够用于射线环境、哪些不能用?这要求对石英玻璃分类。美国Lawerence Livemore国家实验室提出的LL分类法中隐藏一个理论缺陷,即它暗中假定石英玻璃在γ射线照射下,只感生E′,D_0,B_1,Al等4条吸收带,虽然他们所接触的石英玻璃是这种情况,但缺乏理论依据,没有理由认为任何石英玻璃在γ射线照射下只有这4条感生吸收带,事实上确实有的石英玻璃在γ射线照射下还有其他感生吸收带,LL分类法就无法对这种石英玻璃归类。石英玻璃对γ射线的响应有三类,一是有响应的辐照变色石英玻璃,另一是没有响应的耐辐照石英玻璃,第三类是介于这两类之间的、不产生可见的感生吸收带但产生紫外感生吸收带的过渡类石英玻璃。石英玻璃耐γ射线照射的能力取决于杂质总量和羟基含量的比值;比值越大,耐辐照能力越差;比值大于2为变色石英玻璃,比值小于0.01为耐辐照石英玻璃;比值介于其间为紫外透过下降的石英玻璃,即过渡类石英玻璃。     

A Framework for Data Partitioning for C++ Data-Intensive Applications

We present an automated framework that partitions the code and data types for the needs of data management in an object-oriented source code. The goal is to identify the crucial data types from data management perspective and separate these from the rest of the code. In this way, the design complexity is reduced allowing the designer to easily focus on the important parts of the code to perform further refinements and optimizations. To achieve this, static and dynamic analysis is performed on the initial C++ specification code. Based on the analysis results, the data types of the application are characterized as crucial or non-crucial. Continuing, the initial code is rewritten automatically in such a way that the crucial data types and the code portions that manipulate them are separated from the rest of the code. Experiments on well-known multimedia and telecom applications demonstrate the correctness of the performed automated analysis and code rewriting as well as the applicability of the introduced framework in terms of execution time and memory requirements. Comparisons with Rational’s Quantify^TM suite show the failure of Quantify^TM to analyze correctly the initial code for the needs of data management.     

多点时序MCG数据的处理和利用

在简易磁屏蔽室中，用单通道的高温超导rf SQUID梯度计构成心磁图（MCG）测量系统，依照MCG测定部位的约定，测得数例成人胸前多点MCG．不计心动周期随时问的变化，用数据分析软件对这些MCG数据进行分析处理，得到包括了空间信息、可直观展示心脏电磁活动的二维心磁图谱（例如等磁图、时序等磁图、电流箭头图和时序电流箭头图等）     

AUTOCAD数据的转换处理

在全数字摄影测量工作站VirtuoZo上获取的矢量数据为CAD12.0的数据格式,由于我国比较常用的信息处理软件没有统一的编码要求,因此,获取的VirtuoZo数据还要根据用图单位的需求进行数据的转换。针对上述问题论述了VirtuoZo数据转换处理成其他系统数据格式的程序设计方法。利用该程序可以大大的提高工作效率。     

一种改进的二进制自适应算术编码数据转换方法

本文提出了一种用于二进制自适应算术编码的数据转换方法，并通过实验和理论分析，与直接数据转换法、适于灰度图像的数据转换法进行了比较，证明改进的转换方法效率更高     

On the first Laplacian eigenvalue and the center of gravity of compact hypersurfaces

For a closed hypersurface in a space form, this work provides some sharp upper bounds for its first positive Laplacian eigenvalue. These bounds are extrinsic as they rely on the mean curvatures and center(s) of gravity of the hypersurface. Received: May 22, 2000     

Global existence of strong solutions to the Cauchy problem for a 1D radiative gas

We consider a one-dimensional radiation hydrodynamics model in the case of the equilibrium diffusion approximation which is described by the compressible Navier-Stokes system with the additional terms in the pressure and internal energy respectively, which embody the effect of radiation. Under the physical growth conditions on the heat conductivity, we establish the existence and uniqueness of strong solutions to the Cauchy problem with large initial data, where the initial density and velocity may have differing constant states at infinity. Moreover, we show that if there is no vacuum in the initial density, then, the vacuum and concentration of the density will never occur in any finite time.