场

The results of this study indicate that changing the angle of the intake port has a profound effect on the flow field during the intake stroke of the engine cycle. For the case with the intake-exhaust valves canted at zero degree (the so-called vertical valves), the tumble ratio, swirl ratio, turbulent intensity, and turbulent kinetic energy in the direction perpendicular to the bisecting plane of the cylinder are at their highest levels than those obtained for the other cases. This effect is most pronounced after the compression stroke of the cycle. As a result of this study, it is observed that the behavior of the overall flow field from the intake to the completion of compression stroke has a major impact on the effectiveness of the mixing of fuel-air prior to the ignition of the engine cycle.

结果显示，改变进排气阀的倾斜角度对进气期间的流场变化有很明显的影响，其中以垂直阀(进排气阀倾斜0度)所得的 Y轴向(Y方向系垂直於将汽缸对分为二平面的方向)滚流强度、涡漩比、紊流强度、紊流动能等流场强度为最强；若以流体经活塞压缩后的流场特性进行探讨，所得结果显示压缩冲程对汽缸内流场的效应是不容忽视的；因此由进气到压缩过程结束的整体流场现象，才是影响引擎点火前的油气混合程度与燃烧品质的关键。

The results of numerical simulation shows that without considering the influences of wind field, the influx and the positions of infalls and outfalls decide the West Lake"s field structure which would further decide the rule of water"s process and distribution.

各种工况下的流场和浓度场模拟结果表明：在不考虑风场的情况下，各进出水口的流量和位置决定了西湖的流场结构，而流场结构决定了水体的推移扩散规律。

It directly decides the oil output of our country. In the process of oil exploration and exploitation, a great deal of data can be collected. These data form 3D data sets, for instance, density sets, hole degree, and flow sets of high-pressure shoot in one block. At present, the usual adopting method is to draw isoclines of data sets, and ask the career men to analyze and explain them.

在石油勘探、开发过程中，会采集到大量的数据，形成三维数据场，如某一区块的密度场、孔隙度场、高压射流的流场，目前使用这些数据时，通常采用的方法是画出数据场的等值线，然后由专业人员进行分析、解释。

In this way, the simulation of actualseepage fields in complicated site and construction conditions were made in order tohave a deep view of the general rules of seepages in earth dam, and illuminate laws ofmain physical quantities.

通过土坝渗流场的三维非稳定分析，以期达到对土坝渗流场实际复杂情况的模拟，比较理想地反映不同时段的土坝渗流场中等势线、流速矢量、无压渗流场自由面以及流量等渗流要素在不同条件下的变化规律，从而在一定程度上弥补过去对土坝渗流场研究的不足。

In view of the ill-posedness of the diagnosis problem, an effective measure is adopted to make it well-posed. Then the diagnosis problem is transferred into a variational problem which is solved by a regularization method.

&流场诊断技术&是一门综合利用实验测试技术和理论计算技术，进行快速流场分析和流场评估，给出叶轮机械内部流场详细信息和流场优劣判断准则的新兴的综合技术。

Ultimately, we calculate steam function field, velocity field, pressure field and stress field.

最终，得到了粘弹性流体在扩张流道内流动时的速度场、流函数场、压力场和应力场以及在带横向槽流道内流动时的速度场和流函数场。

In this paper, associated with the key problem of 550kV SF6 high voltage circuit breaker which is used in GIS of three Gorges project, the mathematical models of static electrical field and one-dimensioned and two-dimensioned gas flow field during the overall breaking process in arc chamber of circuit breaker are developed. On the basis of gas discharge theory, the criteria to judge the interruption success is determined.

本文结合长江三峡550kV GIS中SF6断路器的科技攻关项目，建立了断路器开断过程中灭弧室内静电场、一维气流场、二维气流场的数学模型；根据气体放电的基础理论选定了衡量断路器能否成功开断的标准，并通过一维和二维气流场的有机结合，有效地解决了原二维气流场计算软件无法计算有载开断的难题，具有较强的工程实用性。

The three dimensional flow field in the triple-screw extruder with triangle configuration is the research objects of this task, including velocity field, pressure field and shear rate field etc., simulate the representative flow field in metering section of the triple-screw extruder, consisted of three-thread element with75mm pitch, has been simulated at the screw speed of 60, 120, 180, 240 and 300rpm and the flowing regulations in flow field and especially the role of the unique center zone affecting to the conveying and pressure generating ability have also been analyzed.

本课题以三角形排列的三螺杆挤出机三维流场为研究目标，研究内容包括速度场、压力场、剪切速率场等。模拟分析首先以螺距75mm的三头螺纹元件为代表，计算由其构成的三螺杆挤出机在60、120、180、240及300rpm转速下的流场，分析流动规律，并分析了特有的中心区在输送、建压方面的作用。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

Three regional climate models (MM4,RegCM2 and P-σ incorporated coordinate model)have been used to simulate the regional climate over eastern China in July .It is found that these three models have different performances in simulating different climate elements such as 500 hPa geopotential high field ,temperature fields,sea level pressure and rainy belt location.The results are important for developing regional climate model system which is suitable for eastern China and improving the simulation and forecast results.

利用MM4中尺度数值模式、RegCM2模式和P-σ混合坐标五层区域气候模式，以GFDL多年平均的6月份气候场作初始场，对我国东部地区7月份的区域气候进行数值模拟，比较、检验了三个模式模拟中国东部区域气候的性能，发现对500 hPa高度场、温度场、海平面气压场、雨带位置等不同的模拟对象，三个模式各有优劣，其结果对于发展适合我国东部地区的区域气候模式系统、改进模拟和预测效果具有一定的参考意义。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。