电学

The results suggest that the high Al content in the AlGaN barrier layer is promising in improving material electrical properties and device performance.

结果表明，提高AlGaN势垒层Al的组分有助于提高AlGaN/GaN HEMT结构材料的电学性能和器件性能。

Thermochromic properties of vanadium dioxide thin films are applied to solar energy materials, photoeletric switch and bolometer materials for the uncooled microbolometers due to their high temperature coefficient of resistance at room temperature.

中文摘要具热致变特性之VO2薄膜因在室温附近有明显的相转变现象，同时发生光电性质的急遽的转变，且在室温之下有较高的电阻温度系数，所以在一系列氧化钒化合物中格外被受瞩目；VO2因这些性质而被广泛应用於太阳能控制材料、电学开关、光学开关及非冷却型辐射热感测器等半导体元件之中。

When the molten pool begin to solidify,the trapped residual organicmatter may burn,carbonize and boil within the cooling pool,which results in trappedbubble defects inside on the surface of the sintered electronic paste film.

电学性能测试表明：从0至38V驱动电压下，该跨桥式静电驱动可变电容的电容量从0.1705pF增加到0.1919pF，调节范围为12.55％，在1GHz下Q值为20。

There are many kinds of sensors , and the gas-sensor is an important kind, whose theory is to make use of the variable of resistance under the sensitive gas condition, resulting in the change of electricity variable in the circuits.

传感器的类型有很多，而其中很重要的一种就是电阻型气敏传感元件，它的原理就是利用敏感电阻在气体中电阻率改变，从而引起电阻的变化进而通过电路中电学量的改变来测量敏感气体的存在。

In the classroom of college physics the potential distribution of an arbitrary linear charged circular arc is a typical and meaningful electrostatics problem.

在静电学中，任意线电荷圆弧的空间势分布是一个典型而有意义的非线性物理学问题。

There is a small action range in archery.Simple methods and analysis is inadequate,so the author,on the basis of testing the archery athletes in national team with the Qualisisy infrared photoelectric testing system,Footscan sole pressure testing system,Noraxon myoelectricity remote testing system, etc,analyzes comprehensively the action technique of the athletes in national team from the posture,body motion characteristics,body posture equilibrium and stability,distribution of centre sole pressure, myoelectricity characteristics,etc,with the methods of relative software and data statistics.The conclusions and the suggestions are as follows:Conclusion:Firstly,the communality of posture angle,muscle strength,the activation order of main muscle during raising the bow, raising the bow and the timing of the raising could be used as the evaluation index of technique action in archery;Secondly,the length of the time needed in the different periods couldn\'t be used as technique evaluation index since it has no relation with the result.But the time of raising and pulling back the row is relatively fixed,and the time has a positive relation with the archery achievement of the national team in China.Thirdly,the central index of the sole pressure could be used as the reference criterion of selecting athletes and forecasting achievement.During playing archery,the interrelation between the central index of the sole pressure and the achievement is different individually and in different periods.Fourthly,there is low stability of the archery athletes in the front and back direction during the action, caused by the athletes\' posture disequilibrium of dorsal abdominal muscle and non-professional sport shoes..Fifthly,kinematics and electromyography shows that the people on archery in China haven\'t taken the raising and pulling back the row seriously.

射箭的肢体动作幅度小，简单的手段和分析不能满足其需要，笔者结合各种运动生物力学仪器优点及射箭项目的特性，选用Qualisisy红外光点测试系统、Footscan足底压力测试系统、Noraxon肌电遥测系统等对国家队射箭队运动员进行多方位的测试，运用相关软件及数理统计方法，对运动员的射箭动作技术，从射箭动作的姿态构架、肢体运动特点，身体姿态平衡稳定性、足底压力中心分布、肌电特性等进行全面分析，结论及建议如下：结论：第一，姿态角、肌肉用力激活程度、举弓阶段主要用力肌肉激活顺序、举弓、开弓时间等的一致性可作为射箭技术动作评价指标；第二，各动作阶段所用时间的长短不能作为技术评价指标，但举、开弓的时间相对较固定，开举弓时间比与中国国家队射箭成绩正弱相关达到显著性；第三，闭眼状态下足底压力中心单位面积轨迹长与144支箭最好成绩正相关达到显著性，可作为身体素质、选材及成绩预测的参考依据；实射时身体平衡的足底压力中心指标与成绩的相关程度具有个体性差异、阶段性差异；第四，射箭运动员实射时身体在前后方向上的稳定性较差，这与运动员的站立姿态、腹背肌力量的不匹配以及射箭没有专业运动鞋有关；第五，运动学及肌电学都表明中国射箭训练对举弓、开弓阶段的重视不够，背部肌肉用力特征不明显，撒放技术合理性不高。

The fusing quality can be effected easily due to sever changes of commutator's temperature during the process.

换向器与各绕组之间的焊接质量是保证微电机转子电学性能的关键所在。

The electronic properties of annealed slices and coterminous non-annealed slices were evaluated by Hall measurement.

利用霍尔测试设备测量了晶体退火前后的电学性能。生长态的Hg_(1-x)Mn_xTe晶体大部分为P型半导体。

Also covered is: Relativity and electricity; Coulomb's law; and magnetic fields.

同时也包括：相对论与电学；库伦定律；及磁场。

Following developments in electrical theories such as Coulomb's law , which showed that positive and negative charges attract, analogs in human life were developed, such as "opposites attract."

随着电学理论的发展，例如库仑定律的提出表明异种电荷相互吸引，类似的概念在人类生活中也被提出，例如"异性相吸"。

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。