精度

Based on the analysis of the mathematics models of saturation steam density and superheat steam density the paper states that the deviation of the detection on temperature highly affects the accuracy of intelligent flow totalizer.

文摘：在分析饱和蒸汽和过热蒸汽密度的数学模型的基础上指出，温度检测的偏差对智能流量积算仪的精度影响极大，尤其是饱和蒸汽，测温电路的精度应设计为远高于仪表的精度，同时引入一种基于比率法的高精度测温电路。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

To get the observer's Lat.and Long.just by pressing a button without the sea horizon to turn to,we should know clearly the relationship between the accuracy of zenith distance observed and the accuracy of a position fixed,the causes of the errors of zenith distance observed,what accuracy of zenith distance observed could be obtained and what accuracy standard should be used.

要在无水天线测天时一按按钮就可定出较精确的船位经纬度，必须弄清天体顶距测量精度对定位精度的影响，弄清顶距测量误差产生的原因，可达到的精度及选用适当的精度标准。

Applied example makes clear, PSO can be solved well have nonlinear the computational precision of the least square method of optimizes problem;PSO computational precision excel that optimize target function or has multi-parameter, define with other and contented standard most the methodological computation precision of zonule condition comparatives, can achieve the result with taller precision and come true simply easily.

应用实例表明，PSO能够很好地解决具有非线性优化目标函数或具有多参数的优化新问题；PSO的计算精度优于最小二乘法的计算精度，和其他满足标准定义的最小区域条件的方法计算精度相当，能够获得精度较高的结果且简单易于实现。

In response to broach dentiform precision molding design and calculation of the degree of difficulty, and enhance the accuracy of processed products, the company's decision to purchase gear in the design of software programs to achieve the required accuracy of customers, and the coming years, and one after another machine tool purchase, replacement, in order to enhance broach manufacturing efficiency and accuracy.

因应拉刀齿型成型之设计精度及计算之困难度，及提升加工产品之精度，本於公司决定添购齿轮设计软体程式，以达客户所需之精度，并於往后数年，陆续添购工作母机，汰旧换新，以提升拉刀制造之效率与精度。

The positioning result of phase and broadcast ephemerides are gained using time-satellite differential model after canceling SA, the precision for 24 hours phase observation data is about 1.1 metre,the precision for 2 hours phase observation data is about 1.3 metre,the precision for 1 hour phase observation data is about 1.6 metre ,the precision for 20 minutes phase observation data is about 2.7 metre.

采用时星差模型得到取消SA后相位和广播星历的定位结果：用24小时的相位观测数据定位精度在1.1米水平；用2小时的观测数据定位精度在1.3米水平；用1小时的观测数据定位精度在1.6米水平；用20分钟的观测数据定位精度在2.7米水平。

Repace the thrust bearing in the Fidaptor periodically,when you use the Fidaptor repeatedly,bearing will wear and become damaged,thereby losing their smooth rotation and resulting in deteriorated measurement accuracy.

定期更换精度调节器的推力轴承。频繁使用精度调节器后，轴承受到磨损，失去平滑旋转的能力，降低测量精度。2 使用前检查调节器：灰尘、缺少黄油或主轴弯曲均会降低测量精度。

To delineate the role of these factors in tissue oxygen moni tor,a multi-layered Monte-Carlo method was applied in this paper.The result of the simulation shows the accuracy of tissue oximeter decreases with the increas e of the thickness of overlaying tissue;The higher variation of SO2 itself,th e higher regional blood volume in tissue and the higher haematocrit in blood intr oduce additional error in measurement.

本文利用多层介质条件下的蒙特卡方法对影响近红外光谱组织氧检测精度的因素进行了仿真，结果表明外层覆盖组织厚度的增加导致检测精度的急剧下降，较大的局部血氧饱和度波动本身也会降低测量精度，较高的血容积和红细胞比容都对测量精度不利。

Increasing observation accuracyand reducing the error of the measuring ship will improve the accuracy of orbit determination during Translunar orbit phase,and the reduced dynamic method and improvement of lunar gravity accuracy will benefit the accuracy of orbit determination during Misson Orbit phase.

在奔月阶段，提高观测量精度和减小测量船的点位误差将有助于提高定轨精度，而在环月阶段，采用减缩动力学方法和提高月球重力场精度将有助于提高定轨精度。

New coefficients of the equation are developed, then a set of coning error compensation algorithm is derived.

本文丰富和完善了新的圆锥补偿算法设计方法，并利用新的设计方法给出了7种新的圆锥补偿算法，在计算量增加不多的情况下，提高了圆锥误差的补偿精度；圆锥补偿后的剩余误差是评价圆锥补偿精度的重要指标，也是工程实际中设计圆锥补偿算法的重要依据，本文给出了新的圆锥补偿算法精度评定方法，既可以评价圆锥补偿算法的精度，又方便于实际应用

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。