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In this paper, the demand and measure of security for the internet tax payment system in our work have been introduced. The investigation and analysis of the real security in the internet tax payment system reveal that the secure risks are mostly from damages of software and hardware, malice code, virus attack, error operation of legitimate user, attack and destruct of malice assaulter and hacker.

本文以作者的实际工作为基础，对网上报税系统的安全需求及已采取的安全措施进行了简要介绍，通过对网上报税系统安全现状的调查和分析，了解到其安全威胁主要来自系统的软硬件故障、恶意代码和病毒的攻击、合法用户的误操作、恶意攻击者或黑客利用系统的安全漏洞及管理上的漏洞进行恶意攻击和破坏等几方面。

In this thesis, we take the delay r as a bifurcation parameter to investigate the Hopf bifurcation phenomenon in system (1). By analyzing the associated characteristic transcendental equation of system (2), and using the Hopf bifurcation theorem, we obtain one condition for the existence of Hopf bifurcation in system (1). Furthermore, based on the center manifold theorem and the method of normal form, some interesting results about the properties of Hopf bifurcation are obtained, including the direction of Hopf bifurcation and stability of Hopf bifurcating periodic solutions.

我们以时滞T作为分支参数，研究了系统(1)的Hopf分支现象：通过分析系统(2)的特征超越方程，结合利用Hopf分支定理获得了系统(1)的Hopf分支存在的一个条件；利用中心流形定理和正规形方法分析了系统(1)的Hopf分支的性质，包括分支的方向和分支周期解的稳定性。

The mechanism and dynamic model of ASVG is introduced in this article at first. Then the authors point to the problems of running and control of ASVG under asymmetric conditions of power system, and put forward the asymmetric expert PID control law. Under the experimental condition of 10%negative voltage, the simulated results are given.

论述了ASVG的工作机理和在系统电压对称时的动态数学模型，并针对系统电压不对称时ASVG的运行与控制问题，分析了系统电压不对称时的被控对象模型，提出了恒电压不对称专家PID控制方法，给出了系统有15%的负序电压时的仿真结果。

The nonlinear plant is first linearised, the fuzzy basis function vector is then introduced to adaptively learn the upper bound of the system uncertainty vector,and its output is used as the parameters of the compansator in the sense that both the robustness and the asymptotic error convergence can be obtained for the closed loop nonlinear control system.

在该方法中，首先将非线性系统线性化，然后利用模糊基函数向量自适应学习系统不确定向量的上界，模糊基函数向量可作为补偿控制器的一个参数。在控制系统的设计过程中可充分保证非线性控制系统的鲁棒性和跟踪误差的渐进收敛性。

By means of generalized Lyapunov function and linear matrix inequality,the asymptotical stability with zero solution is studied for the system,and a sufficient condition is given such that the system is asymptotically stable with zero solution and also a H∞ norm constraint .

针对非线性离散广义系统研究了状态反馈H∞控制器的设计问题，利用广义Lyapunov函数和线性矩阵不等式，首先对系统的零解渐近稳定问题进行了研究，并在此基础上给出了系统的零解渐近稳定且具有H∞范数约束的充分条件，之后设计了状态反馈H∞控制器，使闭环系统具有同样的性能，最后给出了数值算例说明本文结论的有效性和可行性

Through introduction of the digital optical fiber network system,the audio frequency

系统的光纤网络系统、音频控制系统和效果声处理系统的介绍，阐述了其在东方艺术中心建筑中的

It has been shown that any 3×3 ABCDEF augmented matrix,which describes a misalighed optical system,can be represented by an ordered product of basic matrices of , and types.

Casperson[1] 首先研究了描述轴对称光学系统 2× 2矩阵的分解及系统的合成问题。对于实际光学系统，例如谐振腔，由于安装和调整误差、光学系统工作时外界环境产生的微扰、变形而产生失调。

Depending on network, heart beat detecting and database technique,the system realizes failure detecting,autoalarm and control switch.

介绍了某型综合调查船测量控制系统的热备份软硬件系统的设计与实现，采用网络技术、心跳监测和数据库技术，实现了系统的故障检测、实时报警和自动切换，保证了不间断的高质量数据采集和测量系统的可靠运行。

For solve problem these, we basis these design one computer lab fire prevention the burglary-resisting system, computer lab fire prevention burglary-resisting system through infrared sensor , temperature sensor , gas detector has lenses, spend the system lasting 24 hours to control to the computer lab to transmit to the picture , find unusual situation autoalarm , play a firing prevention theft- proofly role really , can make computer system relatively safe in one, in the reliable environment , operate steadily for a long time , and lengthen service life as much as possible .

为了解决这些问题，我们依据这些设计了一套机房防火防盗系统，机房防火防盗系统通过红外传感器，温度传感器，气体探测器还有摄像头，利用系统对图像传输对机房实施二十四小时监控，发现异常情况自动报警，真正起到防火防盗作用，能够使计算机系统在一个相对安全，可靠的环境里，长时间稳定地运转，并尽可能延长使用寿命。

Based on the principles of autocatalysis and the theory of entropy, this paper tries to discuss and attest the autocatalytic mechanism in systems which cause general S curve.

运用熵理论和自催化原理对系统发展过程中普遍存在的 S型曲线的成因进行了论述和证明，指出系统出现 S型发展曲线是由系统的自催化机制和系统的限制因素共同作用引取。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。