原理

Through profound study of coupling relationship between gyroscope scale factor and its input axis misalignment,an uncouple principle was proposed,a precise mathematic model was established,and a set of uncouple test equipment and experiment were designed;the methods for solving constraint nonlinear Least-Squares problems were applied...

通过研究陀螺标度因数与输入轴失准角之间的耦合关系，提出了解耦测试原理，建立了严格的数学模型，针对该原理设计了解耦测试设备和方法；应用有约束多元非线性最小二乘问题解法实现了解耦解算。

Primarily, the thesis assays the condition of network framework, the network was divided into three levels in terms of network management in order to establish the distributed method ,and still pointing out the intention and denotation of studying the Topology Discovery.Next, the thesis analyzes SNMP protocol minutely, including its development, principle, and the Network Management system that established on the SNMP protocol. Have analysed MIB in detail and the application way of MIB in network management .The thesis also assays the ICMP protocol, describing its working principle and the format of datagram minutely , and describing two important tools of ICMP- Ping and TraceRoute in detail. On the base of upper analysis, the thesis expounds a kind of distributed Topology Discovery project, and book it in one autonomy system. Topology Discovery was divided into two levels in terms of network management, and analyses the way of linking up between the two level. The thesis minutely assays Router-Level Topology Discovery technology basing on SNMP and Subnet-Level Topology Discovery technology basing on ARP and ICMP. According to these analyses, the thesis explores the specific methodology and the technology of XML data object which using the WinSNMP API to achieve topology discovering system on the development platform of Visual C++, and also analyses the technology of topology analysis and topology graph minutely. Moreover, the thesis assays the technology of basic firewall and Topology Discovery response strategy. Finally, the thesis analyses the underlying blind problem of the topology finding, and also analyses the reason that the blind problem produced and the way that reduced. The distributed algorithm that this paper puts forward has a certain directive significance in wireless network or other fields.

本文首先分析了网络结构状况，将网络从网络管理的角度划分为三个层次，为分布式的方法奠定了基础，同时还指出拓扑发现研究的目的及意义；接着本文分析了SNMP协议，详细分析了SNMP协议的发展状况，协议的工作原理，以及由SNMP协议基础上建立的SNMP网络管理体系，详细分析了MIB，以及MIB在网络管理上的应用方式；本文又分析了ICMP协议，详细描述了ICMP的工作原理和数据报格式，并详细描述了ICMP的两个重要工具-Ping 和TraceRoute；然后本文在结合上述分析的基础上，提出了一种分布式的拓扑发现方案，将拓扑发现拟订在一个自治系统内，将拓扑发现从网络管理角度划分为路由器级和子网级两个层次，分析了两个层次之间的衔接方式，同时从拓扑地域的角度将拓扑发现过程分布化，分析了分布式算法的具体方法和分布式结点之间的数据通讯方法，本文详细分析了基于SNMP的路由器级拓扑发现技术和基于ARP和ICMP的子网级拓扑发现技术；根据这些分析，本文利用XML数据对象作为分布式算法中的数据对象，分析了XML的技术，本文使用Visual C++开发平台实现网络拓扑发现系统，详细分析了使用WinSNMP API实现基于SNMP的路由器级拓扑发现和基于ARP的子网级拓扑发现，分析了使用Winsock编程实现基于ICMP的子网级拓扑发现，本文还对拓扑分析和拓扑图的绘制技术作了较细致的分析；本文最后还分析了基本防火墙技术，分析了几种类型的防火墙对拓扑发现带来的影响，以及在拓扑发现时的应对策略，本文还分析了拓扑发现中可能产生的盲点问题，分析了盲点产生的原因以及拓扑发现中减少盲点的方法。

By using these maximum principles,the uniqueness theorem and gradient estimates for the solutions of some fourth order parabolic equations are obtained.

文摘：文中证明了四阶非线性抛物方程的最大值原理，利用这些最大值原理获得了一些四阶抛物型方程的解的唯一性定理和解的梯度估计。

The method of "type day unit" is time of basis and"repeated Qian set" principle of space,acquire a day of"type day unit" sky-trunk the rule obtain,at the same time,can also acquire a tradition 《easy to learn 》the principle of "the Ground-branch conceals sky-trunk" and assurance method

"类日单元"的方法，就是根据时空多重"嵌套"的原理，获得"类日单元"天干的纳取的法则，与此同时，还可以得到传统易学"地支藏干"的原理和确定方法

But since it becomes aware in this way that its business must always remain incomplete because the questions never cease, reason sees itself necessitated to take refuge in principles that overstep all possible use in experience, and yet seem so unsuspicious that even ordinary common sense agrees with them.

但自从它意识到因为问题永不停止出现，以这种方式它的工作必定总是停留在未完成状态之后，理性知道自己不得不接受一些原理的庇护，这些原理超出经验中所有可能的使用范围，且仍显得毫无疑问以至于甚至普通的公共意识也同意它们。

Based on the Hamiltons principle and the displacement variation principle, one-dimensional discrete finite element method is developed for vibration analysis of thin-walled members.

对于动力分析部分，概述了Hamilton原理，并由位移变分原理出发推导出考虑剪力滞效应的薄壁杆件振动的一维离散有限元法。

In the chapter 2, based on elastic mechanics and variation principle, the fundamental and process of static and dynamic FEM is presented, placing special emphasis on the modal superposition method.

第二章根据弹性力学和变分原理，系统总结了有限元法求解静力学、动力学问题(包括特征值、动力响应问题等)的基本原理和步骤，并重点对模态叠加法求解动力，响应问题作了阐述。

In this paper,discusses the application of the complementary variational method for the calculation of the electromagnetic parameters.

本文就互补变分原理在计算电磁参数中的应用进行研究，提出了恒定场中基于互补变分原理分析与计算电参数的方法。

In this paper,the application of the complementary variational method of the calculation of the electromagnetic parameters is investgated.

本文讨论了互补变分原理在电磁参数计算中的应用，提出了恒定场中基于互补变分原理的电参数的计算方法，最后给出了计算实例。

In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.

本文在分析传统串级调速原理的基础上，对系统的功率因数进行分析；针对传统串级调速系统功率因数低的缺点，采用升压斩波式串级调速系统加以改进；建立了升压斩波式串级调速系统的等效电路并采用向量图法对该系统的功率因数进行详细分析；分析了系统的谐波情况；构建了以7.5kW／380V电机为调速对象的升压斩波式串级调速系统实验装置，给出相应的实验结果；针对斩波器中IGBT处于硬开关状态的缺点，应用无源无损软开关技术予以改善，包括对软开关电路工作原理的分析、参数的设计并给出相应的实验结果。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。