不均匀分布

Based on analysis of the current state of the flow pattern modeling abroad and at home, explains the meaning of the mathematical simulation of the flows in the valve.(2) Comparing flow simulation data of jet pump with its experimental one, the feasibility and reliability of FLUENT used for flow simulation are proved.(3) Based on the characteristic of valves, the fluid field analysis of specific ring-spray type flow-adjustable is finished. The valve structure is optimized to meet the need, which makes it have such advantages:(1)smaller vortex area and faintish vortex intensity, so the vibration of vortex is controlled effectively;(2)the pressure is distributed more equality, the transition area is larger.

论文的主要内容包括：(1)简述了阀门研究的现状与发展，在分析与总结国内外流体流动模拟研究的基础上，探讨开展阀门内水流运动数值模拟的意义；(2)对特定型号的射流泵进行了内部流场的数值模拟研究，并与实验数据相比较，验证了应用Fluent进行数值模拟的可行性和可靠性；(3)针对调流阀的特点，对特大口径环喷式流量调节阀进行流场计算，其设计指导思想如下： 1、控制旋涡，减小旋涡区，减小涡的强度； 2、控制压力分布，使阀体受力更均匀，改善局部应力状态，提高阀门使用的安全性； 3、最小绝对压力高于水的汽化压力，不产生汽蚀。

As the foaming agent is the continued increase in frother dosage of 400g / t, the gas holdup appears the phenomenon of axial turning point was not obvious, the axial distribution of gas holdup tends to uniform.

随着起泡剂用量的继续增加，在起泡剂用量为400g/t时，气含率出现轴向拐点现象不明显，气含率轴向分布趋于均匀。

Beijing environmental problems hold severe, and atmospheric and water pollute, soil and water loss, hot island and yawp are leading problems,and take on territorial characteristic. Based on research on relativity between urban forest and these environmental problems, urban forest can effective improve environmental quality in Beijing. And for the aim of improve environmental quality, Beijing forest overlay should attain 35% at least in citywide range, and local-areas being severe environmental problem should be provided with higher forest overlay.5. Through the study on urban forest needed capacity, Beijing's forest coverage is up to par in citywide range, but montanic forest coverage, plain covered with trees and average forest area are lacking, and CO2 and O2 balance is incapable;form the point of heat and balance CO2 and O2 balance,urban forest the city zone and suburb is lack. There is urban forest developmental potential space,but the city zone and suburb area need be compensated form urban forest in circumjacent region.6. On the based of the above results and ecological network system, the author drived whole region into city area, plain and mountain area are needed at the point of planning thoughts of running-through forests and water .

根据城市森林与北京市主要环境问题的相关性分析，城市森林在改善这些环境问题中具有重要的作用，为有效改善这些环境问题，整个北京市域范围内森林覆盖率至少达到35%，并且分布比较均匀，环境问题严重的局部区域需要不同程度增加森林覆盖率。5、通过对北京市城市森林需求量研究发现，虽然在市域范围内北京森林覆盖率达到了国家标准，但是山区森林覆盖率、平原林木覆盖率、城区人均森林面积不足；从区域热平衡和碳氧平衡角度分析，城区和郊区不能满足本区域的城市森林需求量，虽然北京市城市森林具有一定的发展潜力，整体上基本可以满足城市需要，但是这些区域需要依靠周边区域城市森林的补偿。6、根据以上的研究结果，以中国森林生态网络体系建设的点、线、面布局理念为指导，以&林网化——水网化&作为优化理念，将北京市整个市域划分为城区近郊区及其辐射区域，平原区和山区三大区域，依据三大区域特点进行城市森林布局优化。

The effects of the spray-drying process of the ammonium paratungstate and the carburization temperature on the formation of the precusor and WC powder were investigated.

采用喷雾干燥-固定床法制备碳化钨粉末，研究了喷雾干燥和碳化反应温度对制备偏钨酸铵前驱体以及碳化钨的影响，前驱体粉末呈现均匀的球状形态，平均粒径为10~20μm，喷雾温度对影响粒径大小和分布影响小；400℃的进口温度下进行喷雾干燥，喷雾粉末仍然保持偏钨酸铵原来的基本组成不发生分解。

The morphologies and purity of CNTs obtained at different temperatures in the range of 700℃-850℃ were investigated. At the optimal decomposition temperature 770℃ the pure product shows uniform diameter, small curvature and high yield. The more important thing is that there is no unremovable oxide support in the products, which represent the excellent properties of MCNTs.

发现在最佳裂解温度770℃下制备的多壁碳纳米管直径分布均匀、曲率小、纯净、产率高，更重要的是不具有难处理的氧化物（如Al2O3）载体，充分体现了碳纳米管作为载体的优越性。

These five zones are as follows: the zone of the reaction synthesis of TiC, the zone of reaction completion, the zone of the growth and homogenization of TiC, the zone of ideal structure and the zone of coarsened TiC particulates.

结果表明：适当提高合金熔体的等温反应温度并选择理想的反应时间，可获得尺寸细小、数目较多且分布均匀的原位TiC颗粒；当合金熔体中TiC的合成反应基本完成时，凝固速度对组织中TiC颗粒的数量和尺寸的影响不是很大。

The method has such advantages as easy operation, stable process and no pollution. The product, when used for fatting leather, can improve the quality, softness and toughness of leather, and can tightly bond with leather fibers. The bonded fatting agent does not transfer in leather, and has such advantages as rapid permeation and uniform distribution, thus can make leather soft and moist.

本发明操作简便，工艺稳定，无环境污染；用本发明制备的产品对皮革进行加脂，不仅能增加成革的丰满性、柔软性、柔韧性，而且能与皮革纤维结合牢固，结合的加脂剂在皮革中不易发生迁移，还具有渗透快，分布均匀等特性，可使皮革柔软、滋润、经久而不枯板。

Also, the efficacy of lysing depends not only on the electric field but, more importantly, on the temporal extend which the cell is exposed to the field strength required for lysis as the cell proceeds downstream.

经由FEMLAB的电场模拟以及MATLAB计算有效体积比率，结果显示3D电极电场不会随著微流道的高度而衰减且具有较均匀的分布，另外3D电极的有效体积比率也优於平面电极。

I recently developed a new type of special ceramic materials charcoal barbecue products (barbecue plate and the pot-type), which are pouring baked products do not contain any harmful substances from the new material, with far-infrared effects, efficient heating , with heat and heat distribution and other performance characteristics.

我公司新近自主研发出一种新型炭性特种陶瓷材料的烧烤制品，该浇烤制品是由不含任何有害物质的新型材料制成，具有远红外效果，加热高效，蓄热量大及热量分布均匀等性能特点。

And below - rotate the pipe a quarter turn to ensure an even distribution of cement on the faying surfaces: in sizes larger than this, rotation is sufficiently difficult as to be impractical.

如果是小口径的管道－ 4英寸或者以下－将管道旋转四分之一圈，确保粘合剂在结合面上分布均匀；如果是大口径的管道－大于4英寸－旋转会非常困难，也不现实。

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。