改变角度

According to the understanding of the flow characteristics, a mechanism of formation of vortex streets has been proposed to be the absolute instability of the wake, and several methods of flow control have been developed and shown successful.

根据表面流动及尾流特性的研究结果，从流动稳定性的角度提出了尾流中涡街产生的机理，在于尾流中存在着绝对不稳定的区域。基于对流动特性的理解，从改变流动稳定性的角度，寻求各种流动控制方法。试验结果表明这些方法是成功的。

First we depicted one theoretical model of LCoS device, and then working modes of LCoS used as phase-only SLM were selected and optimized by varied the twist angle of liquid crystals and polarized angle due to parameter space method, two working modes, which are suitable to apply LCoS as phase-only SLM, were found, that is (0°, 0°) and (0°, 52°). Theoretical study also showed that the (0°,52°) could be used as a compound device, it behaved property of intensity modulation if a working point was selected appropriately and it behaved property of phase modulation when another wording point was selected. At the same time, this two working modes were studied detailed by extended Jones matrix method.

首先建立了LCoS器件的理论模型，并采用参数空间的方法通过改变液晶的扭曲角度和偏振片的起偏角度选择和优化了LCoS器件用作相位调制的合适的工作模式，找到了两种比较合适的作为相位调制的工作模式----(0°，0°)和(0°，52°)配置。

The differences of external rotation angle during dial test were measured and compared between pre-and 1 year post-reconstruction.

比较术前、术后外旋拨号试验测得外旋角度的改变以及重建术后1年步态分析中膝关节外旋角度与外旋拨号试验之间的关系。

Maintain deflector if the size of the same voltage, the voltage change is accelerating, we can see a very accelerated voltage reduce, electron beam deflection angle instead of increasing, it is because of low accelerating voltage, the electron velocity smaller horizontal direction, electronic deflection plates in the field of the role of the extended time, the angle of deflection increases .

如果保持偏转板的电压大小不变，改变加速极的电压，可以看到加速极的电压减小，则电子束偏转的角度反而增大，这是因为加速极电压低，则电子的水平方向速度变小，电子在偏转板中受电场力作用的时间加长，所以偏转的角度增大。

Finally, the PEC-treated LEDs are packeted as the TO-Can and Lamp formal to measure the output power. The fabricated LEDs through the PEC process have 14.6% output power enhanced compared with the general LED at 20 mA operation current.

最后将基板磨薄切割劈裂成晶粒，并且以 TO-Can 与 Lamp 形式封装，量测电性资料与光学特性，发现表面结构的改变也影响发散角度，经过处理的晶粒有较大的发散角度，最终封装成 Lamp 形式的光输出功率增加14.6%。

This system adopts P89V51RD2 microcontroller as the core, the stepper motor as the drivers which is driven by L298 chip, the rudder to change the veer and the angle sensor to detect the transformation of the teeterboard. The infrared detection module is designed fore-and-aft the car.Via taking count of the pulse infrared photoelectric code board determine the location on the board. Infrared remote control keyboard boot the system into operation, and liquid crystal display information about relevant parameters.

本系统采用P89V51RD2单片机作为控制系统的核心，采用步进电机作为电动车驱动电机，以L298为驱动芯片，配以舵机改变转向，使用角度传感器检测跷跷板的角度变化，在车的前后端设计了红外黑线检测模块保证电动车顺利驶上板以及在板上笔直行驶，红外光电码盘通过脉冲计数确定电动车在板上的位置，红外遥控键盘启动系统开始运行，液晶显示相关参数信息。

No matter be returned from economic angle,be political angle, chinese crude oil is depended on outside annulus sure meeting alters carriage aspect, this offerred development chance with respect to the tanker company that gives China, brought investment gravitational force, each main tanker companies build large tanker in succession, try to carry vantage ground is held in the market in prospective oil.

无论从经济角度还是政治角度，中国原油依靠外轮运输的局面必定会改变，这就给中国的油轮公司提供了发展契机，带来了投资引力，各个主要油轮公司纷纷建造大型油轮，试图在未来的油运市场中占据有利地位。

Methods 34 bimaxillary protrusion adolescents were selected and 18 soft tissue of facial profile controls were compaired before and after orthodontic treatment with paired t-test to evaluate the changes in cranio-facial area.

结果 18项软组织指标中5项角度指标的改变在男性组与女性组的改变均有统计学意义， 13项线距测量指标中的上唇厚度、下唇厚度、鼻凸度均增，而鼻底厚度在男性组与女性组改变不同。

The convexity of facial profile decreases after orthodontic treatment for bimaxillary protrusion's adolescents with four premolars extracted, but there are differents in upper lip and lower lip in male and female.

结果 18项软组织指标中5项角度指标的改变在男性组与女性组的改变均有统计学意义， 13项线距测量指标中的上唇厚度、下唇厚度、鼻凸度均增大，而鼻底厚度在男性组与女性组改变不同。

The purpose of this study was to evaluate the changes on the tongue movement during swallowing before and after orthodontic retraction of anterior teeth using ultrasound technique. The subject consisted of four men and nine women, with a mean age of 21.3 years old. The subjects were undergoing orthodontic treatment with extraction, and there were at least 3mm space left on each side between lateral incisors and canines.

在齿颚矫正治疗时，常常利用拔牙的方式让前牙往后方移动，而这样的移动是否会影响舌头的运动及功能则有待验证；本研究的目的是使用B+M模式口腔超音波防震扫描技术，去评估接受拔牙治疗之矫正患者，在前牙后退完成之后，舌头吞咽运动的时间和振幅是否会改变，并检测前牙距离、角度的改变比率和舌头吞咽运动改变比率之间的相关性。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。