流网

In the middle of this paper, six kinds of basic Petri net flow modules which conform to Workflow model are put forward. The method of transforming Petri net flow model to XPDL and constructing Petri network using XPDL is given. These establish the base for different modeling method using Petri net. And these extend EJB task engine and Subprocess task engine of distributed Workflow Management System——Flowstep.

文章中心部分是提出了符合工作流元模型的六种基本Petri网流程模块，给出了由Petri网流程模型向XPDL转换的方法以及由XPDL构造Petri网的方法，为不同的建模方法利用Petri网分析技术奠定了基础；扩展了分布式工作流管理系统Flowstep的EJB任务引擎和子流程任务引擎。

Workflow modeling based on the activity network is straight and wieldy. Petri network modeling has rigorous mathematics logic, firstly, this paper compares the two modeling method, secondly, this paper completes a modeling implement.

基于活动网络的工作流建模直观、易使用，Petri网的建模有严密的数学逻辑，在比较了二者的优缺的基础上，本文的工作流建模工具在表示方式上采用了活动网络的建模方式，在计算方法上采用了Petri网的建模方法。

In organization level, design activity fragmentizing strategy and negotiation mechanism are applied to schedule the collaborative design process. To present the uncertainty in design, resource sharing, message passing and real-timed interaction between programs, the integrated control Petri net is adopted to model and simulate the collaborative level. Control level is realized by workflow model, which control the tasks in collaborative design by means of user management, access control and task control rules.

本文通过细化设计活动策略和协商机制，实现了组织级的协同设计过程规划；针对常用的有色Petri网方法不能解决实际系统运行中出现的不确定性、资源共享、信息传递和外部程序的实时交互等问题，通过对有色Petri网的扩充，提出了采用集控Petri网方法，用于协调级的建模和仿真；采用工作流模型为控制级实现，从用户管理、访问控制模型、协同任务控制规则三个方面实现协同设计过程的任务流控制。

This paper made the value simulation about the flow filed around the net and non-net dumpsite, referring to dusting pattern to establish he source strong simulation pattern of material pilesraising the dust to discharge in the coal dump site that the US environmental protection bureauRecommended.

本文使用标准κ-ε模型对有网堆场周围的流场和无网堆场周围的流场进行了数值模拟，参考美国环境保护局推荐煤堆场起尘模式建立料堆扬尘排放源强模拟模式，给出了不同开孔率的防风网对静态煤堆场的抑尘率，为防风网的设置提供技术参数。

In order to find out a simple and efficient method to calculate the water breakthrough time in combination well pattern of horizontal and vertical wells, simplifing a horizontal well into a vertical well with the same well-hole radius, and considering the unpiston-like displacement, the water breakthrough time formulas of five-spot, seven-spot and nine-spot pattern were derived and revised by equivalent percolating resistance method. In this method, the percolation region is divided into three resistance regions.

为了寻求一种简单、有效的计算水平注水井与直井联合井网的见水时间的方法，将水平井简化为具有等效井筒半径的直井，考虑水平井与直井联合布井水驱油的非活塞性，运用等值渗流阻力法将渗流区划分为3个阻力区，推导出了五点法、七点法和九点法水平井与直井联合井网的油井见水时间的计算公式和修正公式。

First of all, this paper derives pressure expressions of stable state about vertical well inanisotropic media with various boundary. Based on this, Formulae of pressure distributionfor five-spot pattern and nine-spot pattern have been established, the characters of isobariccontours and streamline are analyzed, and this equips optimum of well pattern with theoreticfoundation.

首先利用坐标转换及镜像反演理论，推导了单一直井直线边界、平行直线边界的定常渗流的压力分布公式，在此基础上研究了五点法井网、九点法井网定常渗流问题，推导了压力分布方程，分析了等势线及流线的特点，为各向异性储层井网优化提供了理论基础。

Weigh's addition minishes the loss of net's volume in pure current, but makes no differnce in the pure wave condition. After installed of sinking ring or lower ring, the loss of net's volume is decreased. The loss of net volume is more in the current combined with wave condition than in the pure current condition.

在纯流条件下，增大配重均有利于减小网箱的体积损失；而在纯波条件下，配重的增加对于改善网衣的变形没有实质性的意义；设置了底圈或沉降圈后，均能在一定程度上减小网衣的体积损失；波流组合条件下网衣的体积损失要明显大于纯流条件下的体积损失。

Now the main production: 1092,1575,1760,1880,2400 multi-cylinder single-cylinder single network to multiple networks, net short-and long net paper machine, rotary screen machine to machine short-long network, Winder, pressure-ray machine , Dry pressure-ray machine, level-sizing machine, ramp-sizing machines, screen-basket, two-phase pump, ZBJ small pump,Ф500-1000 mm screw propeller, the slurry pond blender, 5 m3 Dajiang Ji , 12-inch circulating pump, a high concentration of vertical hydraulic pulper, horizontal hydraulic pulper, 1575,1092 standards and widening of Cutter, thin slurry valve 5 t and 8 t-cut grass and dust collector 606 Cleaner And so a variety of products, production of paper making equipment in various gears, sprockets, shaft length and various derivative Roll, Roll and maintenance Dryer, the drying system to do all kinds of steel gear.

现主要生产：1092、1575、1760、1880、2400单缸单网到多缸多网、短长网、长网纸机、圆网纸机改短长网纸机、复卷机、压光机、半湿压光机、水平式施胶机、斜式施胶机、振筐筛、两相流浆泵、ZBJ细浆泵、Ф500-1000mm螺旋推进器、方浆池搅拌器、5m3打浆机、12寸循环泵、立式高浓水力碎浆机、卧式水力碎浆机、1575、1092标准及加宽型切纸机、薄型浆料阀5t和8t切草机及除尘器606除渣器等多种产品，生产造纸设备用各种齿轮、链轮、长短轴及各种导辊、光辊并维修烘缸，制做各种烘钢大齿轮。

Therefore, as one of the most perspective applications, P2P streaming system has become one of the hotspot of P2P research.This paper conducts in-depth research on several basic issues of P2P streaming system, including the design of P2P overlay network, optimizing the topology based on underlay network, managing member nodes, and scheduling dynamic data set between data sending nodes to obtain minimum delay, etc.

本文针对大规模流媒体应用部署中的若干问题对P2P流媒体技术进行了深入的研究，从覆盖网结构、节点管理、数据分发以及异常处理等方面分析比较了几种典型的P2P流媒体系统模型，针对解决当前主流的图状拓扑模型在实现中存在的组播结构不稳定、异构性节点适应性差、数据调度效率低、开销大等问题，提出了一套完整的面向大规模网络视频直播的P2P流媒体系统AVStreamer的设计和实现。

In succession, by using of the simulative program under various running conditions, we studies the different effects that various parameters on the dynamic current-collecting such as running speed, span length, ocs tension force, masses of pantograph head and framework, damping capacity and stiffness etc. Moreover, measures are suggested to improve the quality of current-collecting, especially the idea of active control scheme, which restains the fluctuation of contact force by modulating the air pressure of pantographs airbag.

利用弓网仿真程序对各种工况的弓网受流进行模拟仿真，分别研究了列车运行速度、接触网跨距、接触线张力以及受电弓弓头和框架质量、阻尼、刚度等对弓网系统受流的影响，提出通过主动控制技术对弓网系统的振动进行抑制的气囊调节方法，将受电弓气囊的气压值作为控制对象，通过对气囊气压的调节来抑制弓网接触压力的波动。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。