流

The main points of this paper are as follows:(1) The actuality and the deficiency of the current workflow technology is analyzed according to the expatiating on the workflow technology.(2) A workflow model supporting the dynamic modifying and its implementation arithmetic and an implementation method using the OO technology is proposed according to the Directed Graph theory.(3) The strategy of dynamic modifying of workflow model is researched, a improved conversion strategy is proposed, and the detailed process of dynamic modifying is discussed.(4) Having researched on the construction scheme of digital campus based on URP and the workflow of office business, an OA system model based on dynamic workflow technology was proposed according to the workflow management system model and several typical functions of OA workflow management system were realized, which is of high value on improving the autoimmunization of business operation and the cooperating work ability.

论文的主要内容如下：(1)通过对工作流技术的全面阐述，分析了目前工作流技术发展的现状和不足，为自己的研究工作划定了问题域范围；(2)利用有向图定义了一个支持动态修改的工作流模型，并给出了该模型的执行算法，给出了该模型利用面向对象技术的一种实现方法；(3)详细讨论了工作流模型的修改策略和方法，提出了一种改进了的转换策略，并给出了动态修改操作的具体步骤；(4)在深入分析基于URP的数字校园建设方案以及办公工作流程的基础上，结合工作流管理系统参考模型，提出了基于动态工作流技术的OA系统模型，实现了OA工作流管理系统中几个典型的功能，对提高业务处理自动化，提高协同工作能力具有重要的应用价值。

Experimental results show the recognition rate of the method is 95%for a known expresser and 72% for a novel expresser. Aiming at the shortcomings of optical flow technique,two improved optical flow algorithms are presented.One way is to introduce forward and backword constraint eqution and Hessian matrix of optical flow equation is computed.The well- posedness of each point of local neighbourhood is examined and the weight of Lucas-Kanade's method is defined as the reciprocal of the conditioning number of its Hessian Matrix.

3针对传统光流法的缺点，分别提出了两种不同的改进方法：其一为引入前向-后向光流方程，计算其Hessian矩阵，把Hessian矩阵条件数的倒数作为Lucas-Kanade光流法的加权阵，可有效消除局部邻域中不可靠约束点，同时提高基本约束方程解的稳定性；其二为针对传统光流法只适用于刚体运动的特点，在扩展约束光流方程的基础上引入了div-curl样条函数作为扩展光流约束方程的附加约束条件，给出了一阶和二阶div-curl样条约束下光流的数值解。

Experimental study on hydraulic characteristics of underflow for energy dissipator with step-down floor

现对跌坎式底流消能工消力池内水流流态的演变进行了初步分析，随着入池能量的变化，消力池中会产生混合流、淹没混合流、淹没底流以及远驱底流流态。

An instance was given by means of the numerical solution for the first boundary value inverse problem of Laplace's equation.

将直匀流绕物面作二维无旋不可压缩定常流动时的流函数表达为曲面后，利用流函数曲面控制边界与流曲线的对应关系，采用拉普拉斯方程第一边值逆问题的数值解法，提出了来流为直匀流的流曲线造型方法并给出了实例。

In general, the design work with traditional measures is done by hand, which cannot meet the needs of the technology and manufacture. So the author has developed a CAD hydraulic design software fit for lower specific speed axial flow runner, which is easily operated by users.The main research work of this paper is as follows:1 Analyzing the main reason of axial flow power station cannot work well under littler volume of flow in some season and putting forward an improving scheme, pointing out the characters of design under abnormal factors.2 Combined with the development of the industry in our country, the abnormal hydraulic design method of propeller turbine is discussed based on present literature, data and experiment results.3 Guided by the design method of software engineering, a suit of hydraulic design software of Lower Specific Speed Axial Flow Runner is programmed by the object-oriented programming language Visual Basic and a straightforward, concise and standard Windows human-computer dialogue interface is designed for the system, which makes the operation of the system very convenient.4 ActiveX Automation technology is adopted as the interface with AutoCAD and the hydraulic drawings are edited, modified by AutoCAD until hydraulic model drawings according with the demand of engineering practice are output.5 To resolve practice problem, the author has designed a lower specific speed axial flow runner for Duowa Power Station through an example.

论文的主要内容有：1 深入分析很多轴流定桨式水电站枯水季节小流量下不能发电的主要原因，提出减容改造方案，并指出超常规条件下的改造设计特点。2 结合国情及行业发展需要，参考现有资料、文献和前人的研究成果，进行低比转速轴流式转轮叶片水力设计方法的研究，对轴流式转轮叶片的奇点分布法水力设计进行了全面的探索，结合现代计算机技术，找到了一种针对特殊条件的轴流式转轮叶片水力设计方法。3 仔细比较多种AutoCAD二次开发工具后，结合本课题的特点，选用Visual Basic语言，综合应用软件工程的设计思想，进行低比转速轴流式转轮叶片水力设计软件的编制，为系统设计了直观、简洁和标准的Windows人机对话界面，便于用户操作；编程时在考虑到设计条件特殊性的同时，尽量做到程序的通用性，使之可用于解决同一类问题；另外，大部分程序还可移植到普通轴流式转轮叶片水力设计中，具有良好的适应性。4 利用ActiveX Automation技术与AutoCAD接口，对AutoCAD进行二次开发，在AutoCAD下实现水力图的自动生成和编辑，直至输出符合实际工程要求的木模图。5 通过算例，为多哇水电站设计了一个低比转速轴流定桨式转轮，解决其在枯水期小流量下不能发电的问题。

Workflow process model consists of logic layer and semantics layer, and workflow pattern is the summarization and generalization of all the repetitiously used conjunctive symbols and its conjunctive relationship in the logic layer of a workflow process model.

本文在考察和比较了国内外各种关于工作流建模理论研究的基础上，针对实现工作流管理系统这一目标所涉及的工作流元模型、工作流过程模型等几个核心问题，在前人研究成果的基础上，对工作流元模型的可扩展性、工作流过程模型建模中存在的问题以及工作流管理系统的实现等方面开展了深入的研究工作。

At the beginning of the *** the writher introduces the background of the project, the document analysis of the related research, the research design and research methods; therefore the writher elaborates the basic theories——Post-modern Perspective on Curriculum, Dialogue Theory and Instructional Design Theory used in this ***. In the third section of the *** the writer has compared the running and Open Educational Resources between Chinese Open Courseware and MIT OCW by statistical analysis. The writer focuses on the analysis of guiding resources, learning resources, developing resources, evaluation resources and interactive resources. In the forth section the writer has summed up the difference between Chinese Quality Open Courseware and MIT OCW, then arrived some comparative significance conclusions which will do good at Open Educational Resources of Chinese Quality Open Courseware. At the end of the ***, the writer has summarized the limitation of the research and promoted the following-up study of this study in future.

头后介绍课题的研讨背景、研讨现状、研讨设计和研讨方式；交灭闭于本研讨的实际基本——后现代课程观、闭于话实际和教受教养设计实际的从要观里入行阐述；第三章做者通功统计剖析比拟邦度粗品课程取MIT OCW两个项纲的概略和开放教导资流，反沉闭于开放教导资流外的指里资流、教习资流、拓铺资流、评价资流和互动资流入行剖析；第四章做者反在第三章的基本长入行分解和谈论，形败了一些闭于人邦邦度粗品课程开放教导资流建设无还鉴意义的比拟解论；反在本研讨最末做者道亮研讨所亡反在的一些出无脚，并闭于本研讨的后续研讨入行了铺望。

In this paper, two kinds of uniflow hydrocyclone's spin movement are caused by bar vertex ban inlet setting. Its performance prediction is based on CFD analysis and a mass of test. By FLUENT application and selecting the RSM model, CFD analysis is performed on 66mm returned flow hydrocyclone and 70mm uniflow hydrocyclone (cone-shaped, columniform), pressure field and velocity field and inner flow field are gained, this approves the results of CFD analysis accord with experimental results. Based on the results of CFD analysis, the schemes of optimum structure may be raised.

设计的两种直流式水力旋流器内的自旋运动是由新型涡流板入口结构引起的，它的性能预测是基于数值计算和大量的实验，通过利用Fluent流体动力学软件，针对旋流器实验样机的主体结构形式，基于RSM模型对内部流场的压力分布、速度分布和流体流动情况，对66mm返流式水力旋流器和70mm直流式水力旋流器进行了模拟分析，为水力旋流器的结构优化设计提供了借鉴。

To experiment on 66mm, 75mm returned flow hydrocyclone and 70mm uniflow hydrocyclone (cone-shaped, columniform) in water-sand intermixture, then each capacity, separation performance and correlative parameter's change rules are obtained and compared. Building up overflow system in series of 66mm and 75mm hydrocyclone, separating property and partition curve of the system through experiment are gained.

分别对66mm、75mm返流式水力旋流器和70mm直流式水力旋流器四种水力旋流器进行砂水实验研究，得出各自的生产能力、分离性能及相关参数的变化规律，并进行比较；组成返流式水力旋流器溢流串联系统，进行性能测试，得出系统的分离性能和级效率曲线。

At many case of bank foundation, such as the case of upper strongness and lower weakness, strong permeable foundation of dyke, strong permeable foundation of dyke containing low penetrability soft intercalation and the dyke foundation by alternation of low and strong penetrability layer, the appropriate condition of various upright seepage prevention measure (whole cut-off wall, half cut-off wall and hanging cut-off wall) and the optimization of seepage prevention measure are analyzed.

从渗流基本理论出发，以压力水头为基本未知量推导多孔介质三维饱和—非饱和、稳定—非稳定渗流问题的微分方程以及方程的有限元格式；在饱和非饱和渗流场的有限元分析中，不仅考虑了饱和区的水体渗流情况，而且也考虑了非饱和区的水分运动情况，将饱和渗流场与非饱和渗流场统一起来进行研究，整个渗流场采用一个支配方程。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。