压下

Exerting surrounding pressure can prevent crack growing in a uniaxially compressed concrete specimen. The behavior of concrete in which there is no crack propagation (called ideal state without damage growth) is researched in this paper.

通过对混凝土施加围压，使单轴受压混凝土的裂缝发展受到限制，从而研究混凝土在接近无裂纹发展状态下的受压性能。

1 Contrast unstrengthened square reinforced concrete column and 10 reinforced concrete columns strengthened by circular steel jacket were tested under axial loading .

为研究圆形钢套管加固混凝土柱的基本力学性能，进行了1根未加固的普通钢筋混凝土柱和10根圆形钢套管加固的混凝土短柱在不同加固钢套管厚度及初始轴压比下轴心受压试验，初始轴力通过对未加固试件施加后张预应力来进行模拟；在试验研究的基础上，根据应变协调原则对加固后构件轴压承载力进行了数值分析。

To study the basic mechanical performance of reinforced concrete column strengthened by circular steel jacket,a set of experimental work was carried out.1 contrast unstrengthened square reinforced concrete column and 10 reinforced concrete columns strengthened by circular steel jacket were tested under axial loading.

为研究圆形钢套管加固混凝土柱的基本力学性能，进行了1根未加固的普通钢筋混凝土柱和10根圆形钢套管加固的混凝土短柱在不同加固钢套管厚度及初始轴压比下轴心受压试验，初始轴力通过对未加固试件施加后张预应力来进行模拟；在试验研究的基础上，根据应变协调原则对加固后构件轴压承载力进行了数值分析。

Such as: calibrating the laser system, calibrating the measurement region and focusing the CCD camera for the diffuser passage with complex shape, selecting the best incidence angle for the laser sheet,, setting the time parameter including the time between pulses and the time between records, designing the laser system, and selecting water fog with 1～5μm diameter as seedings for PIV measurement after comparing several particles. All of the work is useful to accumulate the PIV measurement experience in turbomachinery. 2. Experimental research of the unsteady flow in diffusers The instantaneous velocity fields within the vaneless and vaned diffuser were measured by using PIV technique.

本文在国内首次进行PIV测量系统对离心风机扩压器内部非定常流动的测量，为此，作者作了必要的实验前期工作：双谐振激光器工作特性的标定；针对扩压器复杂的流道形状，解决了片光源照射区域位置的标定和CCD相机的聚焦等问题；为复杂流道形状的扩压器内部流动的PIV测量选择了最佳片光源入射角度；选择了合适的PIV测量时间参数；为实现非定常内流的PIV测量设计了PIV系统的光路布置；根据非接触测量示踪粒子的选取原则，对几种示踪粒子进行了筛选，最终1～5μm的水雾粒子在本文实验条件下获得最佳效果。

And eliminates pulsing, pumping action of regulator when operating at high usually

卡司凯特轴式Horus 差压型导压计，确保主压阀在巨大起伏与高压状下的性

The actions of quick feed, workpiece feed and quickreturn of the press can be realized automatically under the program control, it is suitable for the arber of axle sleeve parts and the bending, shelling and pressing of sections parts and the stretching of parts, it can be used for flow assembly of car, machine, automobile electric,appliance motorcycle absorber and air conditioner electric appliance compared with common hydraulic press, Type YKT high speed hydraulic press is of high accuracy of adjustment, quick action, stable repeat accuracy and safe reliable operation.

YKT型快速液压机是一种多功能的液压机床，在程序控制下自动实现压机的快进、工进、快速返回等动作，适用于轴套类零件的压装，型材零件的弯曲、压印、套形及零件的拉伸等工艺动作，可应用于汽车、机床、内燃机、轻纺机械、洗衣机、汽车电器；摩托减震器、空调电器等行业装配的流水线上，与普通液压机相比，YKT型快速液压机具有调节精度高、动作速度快，重复精度稳定、操作安全可靠等优点。

The actions of quick feed, workpiece feed and quickreturn of the press can be realized automatically under the program control, it is suitable for the arber of axle sleeve parts and the bending, shelling and pressing of sections parts and the stretching of parts, it can be used for flow assembly of car, machine, automobile electric,appliance motorcycle absorber and air conditioner electric appliance compared with common hydraulic press, Type YKT high speed hydraulic press is of high accuracy of adjustment, quick action, stable repeat accuracy and safe reliable operation.

产品介绍： YKT型快速液压机是一种多功能的液压机床，在程序控制下自动实现压机的快进、工进、快速返回等动作，适用于轴套类零件的压装，型材零件的弯曲、压印、套形及零件的拉伸等工艺动作，可应用于汽车、机床、内燃机、轻纺机械、洗衣机、汽车电器；摩托减震器、空调电器等行业装配的流水线上，与普通液压机相比，YKT型快速液压机具有调节精度高、动作速度快，重复精度稳定、操作安全可靠等优点。

Is the service of agriculture and animal husbandry scientific research, production and sales of private high-tech enterprises, has experienced professional and technical personnel, and to a number of agricultural colleges and universities, research institutes co-operation long-term commitment to crop stalks, pasture Press Processing Products and processing equipment research and development, in the absorption of advanced technologies at home and abroad on the basis of summing up the company many years of experience in China Nongda Prataculture Center, Chinese Academy of Agricultural Mechanization and other units of projects under the support and cooperation for China's rural market, developed a series of crop stalks briquette briquette processing products and complete sets of equipment, mechanical products have achieved the provincial level to promote a permit under the "2006-2008 National supporting the promotion of the Products directory of agricultural machinery."

河北富润农业科技开发有限公司是服务于农牧业的集科研、生产、销售于一体的民营高新科技企业，拥有经验丰富的专业技术人员，并和多家农业院校、研究院所合作，长期致力于农作物秸秆、牧草压块产品加工工艺和加工成套设备的研究和开发，在吸收国内外先进技术的基础上，总结公司多年经验，在中国农大草业中心、中国农机化院等单位对项目支持与合作下，针对我国农村市场，研发出系列农作物秸秆压块加工工艺和压块产品加工成套设备，取得了省级机械产品推广许可证，被列入《2006-2008年国家支持推广的农业机械产品目录》。

When a sudden power failure or accident or normal pump stops when the pump stops, the valve inlet water velocity to reduce stress Agency, the valve plate also fall, when its velocity is zero (that is, inlet flow rate is zero Department), large valve plate because of its own gravity and rapidly turn off (time 3s ~ 5s), the majority of water to prevent backflow, when the valve before and after the formation of a water pressure, water stress, on the one hand through the small valve at the bottom of the three slot for pressure relief vent pressure. 4 water stress from the bypass tube into the cavity patch up the control room (this process for the suction pressure chamber that can effectively absorb the energy of water), when water stress on cavity than inferior vena cava, the pressure of water promote the diaphragm down mobile , the current cavity pressure of water being squeezed out all the small valve plate slowly drop back to standby status, the process time to ease closure adjustable (3s ~ 150s), then the valve has been fully closed, watertight.

当突然停电或事故停泵或正常停泵时，阀门进水口处压力水流速降低，大阀板也随之下降，当其流速为零时，大阀板由于自身重力而迅速关闭（时间3s～5s），可防止大部分水倒流，此时阀门前后形成一种水压差，压力水一方面通过小阀板底部的三条泄压槽进行泄压。4）压力水从旁通管进入膜片控制室上腔（此过程为吸压腔，能有效吸收一部分水能量），当上腔压力水大于下腔时，压力水推动膜片往下移动，当下腔压力水全部被挤出来时，小阀板缓缓下降，恢复到待机状态，此过程中缓闭时间可调节（3s～150s），届时阀板已全部关闭，滴水不漏。

Equalizers are spacer blocks mounted on either the blank holder surface or the die face that maintain a specific gap between the die face and blank holder surface.

在很多情况下，拉延模设计时不放置平衡块。平衡块是一些安装在压边圈或凹模型面上用来维持压边圈和凹模间的压边面间隙的垫片。

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。