Using time - dependent mode matched scattering matrix method and based on the theory of the interaction between atom and electromagnetic field , we predict the effect that the longitudinal transport of electron is partly blocked by the lateral emitting electromagnetic wave and give detail analysis of the mechanism and the feature of the effect 第三章我们以光和原子相互作用理论为基础，用含时模式匹配散射矩阵方法研究了直量子线在太赫兹电磁场部分辐照下的电子输运性质，并得出横向电磁辐射对电子纵向运动的阻塞效应。
Ld - pumped nd : yag , lbo ( type - i critical phase matching ) intracavity frequency doubled , blue laser at 473nm was obtained finally . under the condition of 14w pump power , high power tem00 mode blue laser at 473nm of 1 . 1w was obtained . by means of inserting diaphragm into cavity , the power fluctuation and beam mode were improved ; in the experiments , the proportion of special mode matching in quasi - three - level laser was discovered , and the phenomenon were explained reasonedly 实验上采用对热效应不敏感的三镜折叠腔， ld泵浦nd : yag ，类相位匹配lbo作为倍频晶体，获得了1 . 1瓦的连续473mn蓝光输出；采用腔内插入光阑的方法，有效克服了功率抖动，同时改善了光斑模式；实验中发现准三能级激光器存在两个空间模式匹配比例关系，并对这一现象给出了合理的解释。
The thesis describes the common network attack types as well as research condition of network intruding inspection system , and analyses the basic theory of network data packets transfer on account of protocol tcp / ip , and finally discusses network safe system framework on account of p2drr , which takes linux operating system as the development platform , has c as the development tool , uses libpcap as a tool to capture network data packets , and decode according to various protocols , along with the preprocess function on account of such inspection as i / o port scanning , and analyses the misuse inspecting technology deeply on account of key word mode matching , and studies theory abnormal inspecting system on account of data mining . the inspecting and output function of the whole system is designed as mold in plug - mechanism , so as to transplant and extend the system 论文介绍了网络常见的攻击模式及网络入侵检测系统的研究现状，分析了基于tcp ip协议的网络数据包传输的基本原理，讨论了基于p2drr模型的网络安全系统架构，本系统以linux操作系统为开发平台，采用c作为开发工具，利用1ibpcap库为工具捕获网络数据包，并根据不同协议实现报文的解码，实现了基于端口扫描等检测的预处理功能，对基于关键字模式匹配的误用检测技术作了深入地分析，并对基于数据挖掘的异常检测系统进行了探讨，整个系统的检测与输出功能均以插件机制设计成模块，以便系统的移植和扩展。
