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In this paper, we analyzed the error of film thickness and refractive index caused by the optical control system, and also analysed the allowable error.

通过对光学监控系统引起的薄膜厚度和折射率的误差进行分析。提出膜系的允差分析。尽量减小由于监控设备引起的误差。

Based on the decompound enthalpy of calcium carbonate, the results showed the relative error less then 2.74%, within the allowable error. By this method, which is simple, highly repeatability and accuracy. So the determination method of solid decompound enthalpy with oxygen bomb combustion is feasible and reliable.

通过测定碳酸钙的分解焓，结果的相对误差为2.74%，在允许的误差范围内，且方法简单，重现性好，准确度高，说明用此方法测定固体物质的分解焓是可行和可靠的。

It is given that the connection between interception probability and orbit intersection angle as well as time error under the instance that the main body of objective satellite is destroyed. The choice of orbit intersection angle is expatiated when time error exists by simulation calculation.

研究了对目标卫星主体毁伤情况下，轨道交角和交会时间偏差与拦截卫星拦截概率之间的关系；阐述了有一定交会时间偏差时，轨道交角的选择情况，并对其进行了仿真计算。

Calculation formulae were derived for the maximum angle error of the outputting gear caused by the tangential synthetic tolerance and the last motion error angle caused by normal directional side clearance.

推导出了由切向综合公差引起的输出齿轮最大角度误差的计算公式和由法向侧隙引起的空回误差角的计算公式。

To improve the quality of the image, the defocusing error was used to balance the piston error, spherical aberration and astigmatism, and the results were significantly improved, especially the wave surface variance caused by spherical aberration was decreased by 90%.

运用离焦误差对piston误差、球差和像散进行像差平衡，其效？灾乇鹗乔虿钜鸬牟娣讲钕陆？0％。系统各项像差系数随子孔径数的增加而降低；当子孔径数大于6时，各像差系数变化缓慢。

It analyzes the influence of the time-frequency properties of atom clock on time-keeping error by quantity, and estimates the error of related physical measure caused by the time-keeping properties of atom time-frequency criterion-time resolution.

定量分析了原子钟的时间频率特性产生的守时时差，估算了原子时频标准的守时时差对有关物理量测量所产生的影响。

During the process of camshaft measurement, the phase datum of the key pin or the locating pin can be determined precisely by using the minimum error method of curve symmetry and the cam nose position can be determined by using the minimum error method near the" sensitive point".

在凸轮测量中，采用曲线对称最小误差法，可精确确定键销或定位销的相位基准；采用&敏感点&附近最小误差法，可精确确定凸轮&桃尖&位置。

The invention performs pseudo bit error rate statistic by utilizing the message of multi sampling points in each modulation symbol of discretization system, and again performs one-to-one mapping by utilizing corresponding relation between the pseudo bit error rate and the signal-to-noise ratio, thereby obtaining signal-to-noise ratio estimation value.

本发明利用了离散系统每个调制符号中多个采样点的信息进行伪误码率统计，再利用伪误码率与信噪比之间的对应关系进行一一映射，从而得到信噪比估计值。

Periodic fluid pulsation in aeroplane hydraulic piping could induce fluid-construction vibration and lead to fatigue damage. It is impossible to find the error sensor's optimization location because of the pressure standing wave, and the pulsation attenuation effect is not perfect when adopting pulsation attenuation at single point. For this reason, a distributed active control method of fluid pulsation was presented. To avoid stationary point in all aviation states, several fluid pulsation actuators and error pressure sensors were placed along the piping. The second fluid pulsation produced by actuators can counteract the primary pulsation brought by aviation piston pump and make the mean pulsation of whole piping minimum when adopting adaptive feed- forward control and the filtered-X least mean square algorithm.

针对飞机液压能源管路系统中的周期性流体脉动诱发流固耦合振动，导致管路疲劳损伤的问题，针对管路中存在压力驻波特性，在采用单点消振时寻找误差传感器最佳布局位置困难而引起脉动抑制效果不理想的缺点，提出了一种分布式流体脉动主动控制方法，即沿管路不同位置布置多个主动消振阀和误差压力传感器，在任意飞行阶段，避开压力驻波点，以误差压力传感器的脉动测量值为控制目标，采用一种针对周期脉动主动控制的自适应前馈控制法和多通道自适应滤波－X LMS算法，调整控制器参数，使主动消振器产生的次级脉动与管路中的初始脉动相互抵消，达到整个管路中的平均流体脉动最小的效果。

It is indicated that the accuracy of the measured value is determined rather by the practical relative error than by the maximum relative error. It is correct that the nearer the scale reading approaches the maximum, the more accurate the measurement is. The scale reading need not be required above 2/3X.

指出使用电表进行测量时，测量值的准确性是由其实际相对误差而非最大相对误差决定的；并非电表的读数越接近满刻度，测量值的准确性就越高；使用电表进行测量时，电表的读数不必被限定在2/3X上。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。