牵引

Based on the analysis of soil mechanics for a semi-track air-cushion vehicle,theoretical models for traction efficiency and total power consumption were established,and relationships between slip ratio and traction efficiency,total power consumption were examined respectively.

在分析半履带气垫车所受土壤力的基础上，建立了牵引效率和总功耗的理论模型，讨论了滑转率同牵引效率和总功耗的关系。

This paper describes the inherent relationship between the haulage cutting and high speed extrusion in the production of PVC allotype plastic material and introduces a new type of haulage cutting transmission system.

阐述了在PVC异型材生产中牵引切割与高速挤出的内在关系，并介绍了一种新型的牵引切割传动系统

It is necessary to develop new distractor to meet the special requirement of alveolar.

为此，需要开发新型的牵引器，以满足对牵引有特殊要求的牙槽突。

The therapeutic efficacy in posterior extension sitting position occupying 11-20° was better in upper hind neck; the therapeutic efficacy in anteversion sitting position occupying 11-20° was better in inferior neck; the therapeutic efficacy in anteversion sitting position occupying 1-10° was better in neutral position sitting position.

即上颈段椎动脉型颈椎病患者坐位后伸11°~20°牵引疗效较好，下颈段椎动脉型颈椎病患者坐位前屈11°~20°牵引疗效较好，混合型椎动脉型颈椎病患者坐位前屈1°~10°疗效较好。

In order to study diesel locomotive AC-DC electric-drive system, this thesis makes a analysis of the primary capability parameters of AC-DC electric-drive system, under the train"s running state, such as traction dynamotor"s voltage/ current, pulling power and train velocity, then makes a research in the ideal running characteristic and the adjust characteristic of dynamotor and the speed adjust characteristic of electromotor with the theory of AC-DC electric-drive.

本文针对内燃机车交-直电力传动系统，对机车运行过程中，传动系统的主要性能指标参数(如牵引发电机电压/电流、牵引力、机车速度等)及其关系进行分析；并运用交-直电力传动原理，对机车电力传动过程中牵引发电机的理想外特性、调整特性及牵引电动机的速度调节特性进行研究；通过参考东风7型内燃机车的性能、结构参数，运用Visual Basic对内燃机车交-直电力传动系统进行数学建模。

This paper describes different characteristics of traction motor for freight electric locomotive and pas-senger electric locomotive.

对客运电力机车和货运电力机车所用牵引电动机的不同特点进行描述，针对货运电力机车的使用特点，提出了速度为120km/h的交流传动电力机车用牵引电动机的设计方案，并指出开发货运用途变频交流异步牵引电动机的必要性。

Methods 12 middle-age patients with single femoral neck fracture underwent DSA of selective deep femoral artery and femoral circumflex artery from 2 to 5 days after fracture in the absence of traction, in the presence of 4 kg hip traction in the neutral position and in the intorted position without traction.

对12例青壮年股骨颈骨折在2～5 d内进行旋股内、外及支持带动脉造影，造影中均采用中立位无牵引、中立位5 kg牵引及内旋位无牵引3种形式。

Methods: The hook test was performed by a single surgeon in a cohort of 45 patients undergoing surgical exploration of the distal biceps tendon. While the patient actively supinates with the elbow flexed 90°, an intact hook test permits the examiner to hook his or her index finger under the intact biceps tendon from the lateral side. With an abnormal hook test, indicating distal avulsion, there is no cord-like structure under which the examiner may hook a finger.

一名外科医生对一组45例远端二头肌腱外科手术探查的患者进行了牵引钩试验，当患者肘关节屈曲90度上肢主动旋后时完整的牵引钩试验检查者在完整的二头肌腱侧面可以钩住他或她的食指，而异常的牵引钩试验表明远端撕裂，那里没有索状的结构使检查者可以钩住他的手指。

For the first time, a screw pile and pile driver system for preventing flood and rushing to deal with an emergency was manufactured. The screw piles of the system is different from screw drills used to sap, and it doesn't push soils out. Analyses, including the screw pile's structural strength analysis and the screw blade's welding analysis, were done by ANSYS, which showed that the screw pile's structural strength is enough and that the distort of the screw blade is small. Testing on the screw pile and pile driver system showed that the system performed stably and could meet the need of preventing flood and rushing to deal with an emergency. A mechanics model of interaction of a screw pile and soil was built, and expressions of torque of screw pile's cylindrical part on the condition of screw pile's crew part being driven into soil fully were gained, then the relation of the torque with screw pitch and out diameter of cylinder, which shows the torque decreases with the screw pitch increasing, and that the torque increases with the out diameter of cylinder increasing, which was according with the experiments of the screw pile's being driven into soils, and thus a screw pile with the best structure was chosen. Experiments of bionic surface showed that, on the condition of certain pressure on the surface, the protruding bionic surface can not reduce adhesion and resistance and that the corrugated bionic surface can reduce adhesion and resistance. An orthogonal experiment of the corrugated bionic surface was done with the factors including the width of protrusion, the space between two protrusions, the trolley's velocity and the vertical surface pressure and with the surface frictional coefficient as the experimental target, and some inclusions were drawn that the best combination of the factors was acquired and that the width of protrusion affected the surface frictional coefficient remarkably.

研制了防汛抢险螺旋桩机系统，提高了沉桩作业效率；利用ANSYS对桩体进行整体结构强度分析以及螺旋叶片的焊接分析，表明桩体结构强度足够，焊接过程中，螺旋叶片的变形小；对整个螺旋桩机系统进行试验，表明该系统性能可靠，工作稳定，作业效率高，能够满足防汛抢险沉桩作业基本需要；建立了螺旋桩桩土作用力学模型，得出螺旋桩沉桩过程中螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩以及扭矩与防汛抢险螺旋桩的螺旋导程和圆柱外径的关系曲线，表明螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩随着螺旋导程的增大而减小，随着圆柱外径的增大而增大，这与螺旋桩沉桩试验结论相符合，据此优选出最佳结构的螺旋桩；仿生曲面试验表明，尺寸较小的球冠突起型仿生曲面在一定压力作用下未能起到减粘降阻的作用，而尺寸较大的波纹型仿生曲面相对平板具有一定的减粘降阻作用；以波纹型仿生曲面突起宽度、波纹型仿生曲面两突起之间间距、台车的牵引速度以及叶片表面垂直载荷为因素，以曲面摩擦系数试验指标进行正交试验，寻求出在一定试验条件下最佳因素水平组合；波纹型仿生曲面突起宽度在本试验条件下对曲面摩擦系数影响显著，而其它几个因素对曲面摩擦系数影响均不显著；通过波纹型仿生曲面突起宽度和台车牵引速度的单因素试验，表明曲面摩擦系数随着仿生曲面突起宽度的增大而减小，而随着台车牵引速度的变化基本保持不变，和正交试验结果保持一致。

It was distracted to close the cleft after 3-day latency period. The active distraction period was 7 days and the rate was 1mm/day.

经过3天的延迟期后，牵引输送盘关闭裂隙，牵引期为7天，牵引速度为1mm／天。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。