牵引装置

As a new thought about the vehicle flexible drawing theory and technique, the drawgear has been designed with spring and damper which their spring constant and damping coefficient have been optimized.

根据平顺性试验结果引发出的问题，首次提出了柔性牵引的概念，设想研究、开发及应用柔性牵引理论和技术，把牵引架设计成加装经过优化设计的弹簧～阻尼器单元的柔性牵引装置

It could be concluded that the drawing performance and the riding comfort of the tractor-trailer combinations would been improved obviously when the optimized flexible drawgear was used.

同时发现使用经过优化设计的柔性牵引装置后不但大幅度降低了牵引架上动态纵向力的峰值，因而明显改善了挂接车辆在非平稳道路离散事件激励条件下运行时的牵引运行状况和纵向平顺性状况

Consequently the using of the flexible drawgear can improve the drawing status and the riding comfort conditions of the tractor-trailer combinations greatly under the condition of stationary random excitation.

因此使用柔性牵引装置后大大改善了挂接车辆在平稳随机路面激励状况下的牵引运行状况和纵向平顺性状况

Under the condition of running on the hard soil pavement with the total train mass, the riding comfort tests of the tractor-trailer combinations with the stiff and the flexible drawgear have been performed, and the dynamics longitudinal force has been studied. When the flexible drawgear was used, the theoretical results and the experimental data showed that the peak value of the dynamics longitudinal force, the peak value of the RMS of the dynamics longitudinal force, and the PSD both of the dynamics longitudinal force and of the longitudinal acceleration decreased largely.

以平稳随机路面激励状况下满载行驶作为挂接车辆的经常行驶工况，进行了挂接车辆以刚性牵引架及不同柔性牵引参数的柔性牵引装置牵引运行时的平顺性试验，柔性牵引理论分析结果与试验结果均表明，使用柔性牵引参数值接近优化值的柔性牵引装置后，动态纵向牵引力的峰值、功率谱密度峰值及均方根值均有了大幅度的降低；主车和挂车的纵向振动加速度功率谱峰值也有了很大的降低。

When the flexible drawgear is used, the peak values both of the dynamics longitudinal force and of its instantaneous PSD have decreased largely, and the distribution status of the instantaneous PSD along both the time axles and the frequency axles have been improved. So the working stability of the tractor-trailer combinations braking process would been improved when the optimized flexible drawgear was used.

仿真分析和试验结果均表明，使用柔性牵引装置后，牵引架动态纵向力峰值及其瞬时功率谱的峰值有了大幅度的降低，动态纵向力瞬时功率谱密度沿时间轴和频率轴的能量分布得到了改善，这说明使用柔性牵引装置后有利于提高挂接车辆制动工况的工作稳定性。

In this research, the pubertal five-week-old SD rats were chose as experimental object to establish the animal model for simulating maxillary protraction, on which was imposed the orthopedic force of 85g with utilizing the self-devised maxillary protraction appliance. Located lateral X-ray cephalograms were taken to measure and analyze the changes of maxillary development after exerting the orthopedic force for 4 weeks. The technique of immunohistochemistry was used to investigate theexpression of TGF-, in frontomaxillary sutures and palatomaxillary sutures with identical force performing for different extent of time. The average hue was selected as indicator, which was measured by the means of the analysis system of pathological color images. The measuring data were analyzed by the one-way ANOVA in software SPSS 11.0 version.

本研究采用自行设计的上颌前牵引装置，以生长发育期5周龄SD大鼠为实验对象，施加85g的矫形力，建立了模拟上颌前牵引的动物模型，通过X线头影测量分析，观察施力4周后上颌骨的生长发育情况；应用免疫组织化学技术，检测同一力值作用不同时段下TGF-β_1在上颌骨的额颌缝、腭颌缝的表达，彩色病理图象分析系统测定每张切片中阳性染色细胞的平均灰度值，结果采用SPSS 11.0进行方差分析。

The mode of tracklayer traction used that crawler traction device and wheel hub axis united to control the traction.The question including the traction force match of crawler and moving axis and the stability of running speed directly concerns tracklayer track-lying quality and efficiency.

由于铺轨机组牵引采用履带式牵引装置和轮轨式动力轴联合操控牵引的方式，履带和动轴牵引力匹配，走行速度的稳定性，直接影响铺轨的质量和效率。

Results After 3~6 months, anterior crossbite cases are cured. 6~12 months later, crowded dentition cases were cured.

结果 经过治疗，使用前方牵引装置3~6个月，反纠正；使用口外弓装置6~12个月，解除牙列拥挤。

Methods Twelve cases of anterior crossbite and crowded dentition (with 6~12 mm) were included using extroral arch and extroral protraction in the same time or in the different time.

选择混合牙列期或恒牙早期有前牙反并牙列拥挤（拥挤度6~12 mm）病例12例，同时或先后使用前方牵引装置和口外弓装置，观察疗效。

Our products mainly include a series of traction beds for lumbar and cervical vertebra, computerized 3D multifunctional traction beds, Chinese traditional medicine fumigating curers, far infrared massage beds, first-aid stretchers and beds, electro-motion traction chairs, Multi-positional Electric Lift Physiotherapy Device , Multi-functional Electric Lifting Bed , Electric Lifting Bed , etc.

公司主要生产各种多功能牵引系统、电脑三维多功能牵引装置、中药熏蒸器、远红外线按摩床、电动颈椎牵引机、颈椎牵引机、急救担架、救护车担架、医用抢救床、多体位电动升降理疗床、多功能电动升降起立床、医用超声波清洗等系列产品。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。