电头

研究目的：为了研究高速列车受电弓头动态接触压力特性和整弓气动阻力，在中国航天空气动力技术研究院FD-09低速风洞进行试验。

Research purposes : In order to study the dynamic touch pressure characteristics for the pantograph head and an aerodynamic drag measurement for the whole pantograph , the experimental research is conducted in FD-09 low speed wind tunnel of CAAA .

介绍自制器械包括电刀头、头拉钩、部打结器在小切口胆囊切除术的应用。

We introduced the application of a serial of self-made instruments such as electric knife bit , retractor , deep knotter in minicholecystectomy ( MC ) .

本文利用迈氏干涉法测量压电陶瓷扫描头（PZT）的电滞曲线和灵敏度因子。

The measurements of the hysteresis loop and sensitivity of PZT using Michelson interferometer are described .

为评价正电子发射断层照相术（PET）在颞叶癫痫病人术前侧别定位诊断中的意义，对20例颞叶癫痫病人术前均行脑电监测、头MRI及PET检查。

To study the lateral location diagnosis value of PET in temporal lobe epilepsy before operation , 20 patients with refractory temporal lobe epilepsy were investigated by EEG , MRI and PET .

高密度聚乙烯管道电熔焊接头基本力学行为

Basic mechanical behaviors of high-density polyethylene electro-fusion welded joint

机车受电弓弓头弹簧系统的优化设计

Optimum Design of Collector Head Spring System of Pantograph

一种新型复合电引火药头在秒延期电雷管生产中的应用

Application of a New Composite Fusehead in the Production of Second Delay Electric Detonator

论刚性电引火药头技术的优势

Technology Advantages of Rigid Fusehead

利用超声波的动能来替代机械振动，以期用另一种形式的振动波来优化电渣焊接头性能。

Using kinetic energy of ultrasonic is instead of mechanical vibration to optimize the properties of electroslag welding joint .

从运用的观点来看，受电弓弓头碳基滑板的安装方法是非常重要的。

The method for installing carbon-based contact strips on pantograph heads is very important from the operational points of view .

本文研究了微晶体共沉淀点火药应用于刚性电引火药头，其点火性能和电感度。

The paper studies on the ignitability and the inductance of the rigid electric ignition , while the microcrystal-precipitating igniting explosive is applied to the rigid electric ignition .

碳滑板一般用带贴紧钢套包层的楔型榫制成，或用能夹紧整个碳滑板的金属装配架制作，用螺栓固定在受电弓弓头上。

Carbon contact strips are generally manufactured with a dovetail base that can be clad with a close-fitting steel sheath , or a fabricated metal holder that grips a full-length carbon strip and has installation bolts for mounting on a pantograph heads .

在铁路提速后，受电弓弓头外形、受电弓的静抬升力和空气动力、受电弓的摆动量等都会影响受流质量和弓网间的关系。

After raise of railway speed , the quality of current receiving and interaction between pantograph and OCS will be affected by the outline shape of head of pantograph , static raising force of pantograph , aerodynamic force and deflection of the pantograph .

电渣压力焊接头质量缺陷分析及预防措施

Quality defects of electroslag pressure welding adapter and preventive measures

不锈钢网孔板电火花穿孔机主轴头系统研制

Developing EDM machine tool spindle system for making group holes on rustless steel plate

钢筋电渣压力焊接头易出现的质量问题分析

On Analysis of Quality Problem that is likely to Emerge in Pressured Welded joint of Electroslag with Castiron

由于她的脸严重扭曲，连父母都认不出她来了，当地的小孩子都称她为电风扇大妈：头大身小。

Her face was so altered that her own parents did not recognise her and local children also used to call her ' standing fan ' because her face was so large compared to her small body .

提出在受电弓集电头和底座上安装执行机构，通过传感器返回弓网接触力，与估计力的差值作为控制的输入去控制受电弓的位移。

It is suggested to fix actuators on pantograph collecting head and base . The pantograph-catenary contact force is fed back by the sensor , the difference of estimated and measured contact forces is used to control the pantograph 's displacement .

参照建设部《钢筋焊接接头试验方法标准》的规定，对超细晶粒钢建筑钢筋闪光对焊、电渣对焊接头的疲劳寿命进行了测试。

In the present work , fatigue lifetime has been measured for flash butt welded joints and electrical slag welded joints of the ultrafine grained steel , based on a standard of State Architecture Ministry named " Testing method of reinforcement steel bar welded joint " .

结果表明压电执行器端头挠度谐振幅度随作用电场振幅的增大而增大，以及力学品质因数随电场振幅的增大而减少，并且与实验结果非常吻合。

The predicted resonance amplitude of the tip deflections of the piezoelectric actuators , which increase with the increase in the magnitude of the electric field , the decrease in the mechanical quality factor with the increase in the electric field , and well agrees with experimental results .

操作时，按动电切开关，电刀头即产生电切高频电流；

When the utility model is operated , the electricity cutting switch is pressed , and an electric cutter head generates high frequency electric cutting current ;

受电弓通过接触网将引起接触网振动，使受电弓弓头和接触网之间的接触力波动。

When a pantograph run under the catenary , it leads the catenary vibration and makes the contact force between contact wire and pantograph head wave .

在此基础上，本文给出了钢板电渣焊接工艺中取消正火的力学依据&退火工艺下的电渣焊接头的断裂力学性能优于正火工艺下的接头。

According to the experiment results , the mechanical foundations of canceling the normalizing procedure were given in this paper .

通过对受电弓各主要部分的运动特性进行分析，特别是对受电弓弓头部位的运动进行分析讨论，建立了包括受电弓侧滚运动、俯仰运动和垂向运动的力学模型。

Through analyzing the motion features of each main part , especially the motion of the pantograph head , a DOF model was established , which included several parameters such as pitching , rolling and vertical , etc.