压下的

In the experimental investigation of acoustic streaming, flow visualization techniques are used. The flow patterns of the vortex structures in the tube which transform with the variation of Sound Pressure Level of reflecting end are recorded in detail under the resonate frequency of the tube.

在对驻波声流的实验研究中，首先采用了流动显示技术对共振频率下，驻波管中稳定对称的声流旋涡结构随反射端声压级的变化作了全面细致的记录研究。

Based on the analysis of the dynamic differential pressure signal of two-phase flow through Venturi tube, the various flowrate equations were established according to the flow pattern.

论文通过对文丘里管前后两端的动态差压信号的分析和处理，根据用波动系数确定的流型，建立了不同流型下的各种流量测量公式。

Finally, according to the critical overpressure values and concentration values, vapor cloud explosion model, Gaussian model and atmospheric dispersion model of the special weather conditions, accident consequence is analyzed and the qualitative and quantitative comparisons on consequences of these two kinds of accidents of artificial gas are made.

最后根据各级临界超压值选用蒸气云爆炸模型，根据各级临界浓度值选用高斯模型及其发展出的特殊气象条件下的大气扩散模式进行事故后果分析，并对人工燃气的这两种事故的结果加以定性、定量比较。

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。

The conductive pole only acts for contact and conducting during welding, the pressure pole in its center forces pressure under action of compression spring, and the pressure pole is characterized by high fusing point and mechanical intensity because of the tungsten alloy material, and the life length of contact finger is prolonged.

在焊接作业时，导电杆仅起到接触导电作用，而其中心的压力杆在压簧的作用下起到施加压力的作用，由于压力杆采用钨合金材料，具有高熔点、高机械强度的特点，不会变形，导电杆压力小不易变形，从而延长了整个触头的使用寿命，并且焊点整齐美观。

The residual stress and deformation of the piece as well as the influences of tension on the crown and screw-down were analyzed by using the models. The comparison of simulation results and experimental data prove that the FEM models are accurate and reliable.

利用所建立的模型对带钢轧制过程轧件的残余应力、变形以及张力对板凸度和压下量的影响进行了模拟分析，模拟结果与实验结果的比较证明所建立的模型是正确的。

The solid stainless case and screw-down crown of the Black Tip are rated to 200 meters so you can rest easy underwater, and you'll appreciate the huge numerals on the one-way ratcheting bezel when you need to quickly gauge your bottom time.

固体不锈钢案件和压下冠的黑顶的额定为200米，因此您可以安心地在水下，你会欣赏巨大的数字对单向棘轮面板时，您需要快速判断您的底部时间。

Theoretical analysis of strip mills AGC had been processed and a three-DOF mathematical model of hydraulic screw-down system had been built,which was specified cylinder displacement and inner gap and adapt to varied control way.

对板带轧机自动厚度控制模型进行了理论分析，建立了三自由度轧机负载的液压压下系统的模型，将缸位移和内辊缝相区分，使其适用于不同的控制方式，进而对厚度计式控制模型、变形的厚度计式控制模型、动态设定控制模型进行了对比研究，指出轧机模数和轧件塑性系数分别对应于自动厚度控制系统的静态指标和动态指标，为控制过程中参数的选取提供理论依据。

Some solutions are put forward by analyzing reasons of burning loss for the screwdown screw and nut on steckel mill.

通过对炉卷轧机的压下螺丝与螺母烧损的设备事故现象的分析，找出事故产生的原因，并提出了相应的解决方案。

The VCL method and the displacement method are used to calculate the Stress Intensity Factors of semi-elliptical surface crack at the root of pipe screws, on the basis of which a simplified calculating model for screws contact is put forward so as to analyse the fracture intensity for oil drill pipe screw coupling. For the semi-elliptical surface crack with different shape and deep ratio at the root of female and male screws and the corner of male flange, the SIF has been studied systemically under inter-pressure, tension, bend and torsion loads and the approximate formulas encluding the structure parameters of oil drill pipe screw coupling, deep ratio and the shape parameters of surface crack are developed.

对工程实际中的多种石油钻杆接头螺纹连接件，就公螺纹齿根、母螺纹齿根、公螺纹台阶转角处存在的不同形状、不同厚度比的半椭圆表面裂纹，在拉伸、内压、弯曲、扭转多种载荷作用下的应力强度因子作了系统研究，在大量有限元计算基础上，建立了包含接头结构参数、裂纹形状、厚度比在内的近似计算公式。

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。