有效数字

As with the accuracy specification, this value is given as a percentage of reading plus a number of counts of the least significant digit (or as a ppm of reading plus ppm of range) for digital instruments.

和准确度技术指标一样，对数字显示仪器来说，温度系数表达为读数的百分数加上最低有效位的字数（或者读数的ppm+量程的ppm）。

Experimental results showed that the method can rapidly and effectively localize the text region in digital image.

实验结果表明，提出的方法可以快速有效地定位数字图像中的文本区域。

The simulation results show that the denoising effects of the three methods are all superior to that o f Fourier transform, and the influence of colored noise can be eliminated effectively by bispectrum methods. That is very i mportant for reconstructing LoranˉC signal under the condition of small signalˉtoˉnoise ratio, and also lays the fou ndation for digital LoranˉC signal processing.

仿真分析结果表明，三种方法的去噪效果都优于传统的傅氏变换法，且双谱估计能够有效地去除色噪声的影响，对于小信噪比条件下的罗兰C信号的提取和恢复具有重要意义，也为复杂环境下对罗兰C信号的数字处理奠定了良好的基础。

According to the primary problems limiting Digital Speckle Pattern Interfermetry to be widely used in practical engineering, a novel DSPI method using multi lower power He-Ne lasers to measure the large object was proposed in this project, which overcomes the contradiction between the laser power and the size of object to be measured.

本项目针对制约数字散斑干涉测量（DSPI-Digital Speckle Pattern Interfermetry）在工程中广泛应用的基础性问题，提出利用多个低功率He-Ne激光器测量大尺度构件的新方法，有效解决了高相干性激光器光功率、体积和待测物尺度之间的矛盾，建立了相应的实验系统，并进行了大量的测量实验，获得了满意的实验结果。

The non-reference-signal's adaptive digital filter algorithm of multi-sensor data fusion in the course of adaptive filter can be done without reference signals. It can adjust convergence constant automatically, it can also be recurred with real gradient value. Thus the field to apply the adaptive filter is widened, the convergence speed of the adaptive filter is sped up, the weighted disadjustmend is decreased, so that the last error of mean square approaches its minimum value more.

这章研究的基于多传感器数据融合无参考信号的自适应数字滤波算法其在自适应滤波过程中具有不用参考信号与自动调整收敛因子及使用实际梯度值进行递推的特点，这样不仅可扩大自适应滤波的使用范围，而且还使自适应滤波的收敛速度加快有效地减小权失调，从而使最后的均方误差更接近于其最小值。

This paper introduces a kind of intelligent digital AC millivoltmeter that is based on the chip microcomputer and the design of voltage's real virtual value measuring.

介绍了一种基于单片机和测量电压真有效值方案设计的智能数字交流毫伏表。

The RMS—to—DC transformation is used for collecting virtual value of Ac. The voltage election elects the range of voltage. The analog—to—digital transformation realize transformation of measured voltage to corresponding digital figure. Finally the Sample Digital Display Ac Millivoltmeter is obtained.

其中RMS/DC专用芯AD637用来采集交流有效值转换，电压范围选择模块选择电压量程，模数转换使测量电压转换，最终得到所要求的数字显示交流毫伏表。

To validate the proposed method, numerical simulation and a vibration mode test of a cantilever beam are completed, where the mass varies continuously with time.

为验证方法的有效性，进行了数字仿真和附加质量随时间连续变化的悬臂梁的模态分析试验，试验结果和理论结果比较，表明了提出的线性时变系统的模态参数识别方法有效、可行。

The experimental results show that controlling the pulse width of monostable trigger with CPLD on the basis of full digital ciruits effectively helps the realization of mi...

实验结果表明在全数字电路的基础上，用可编程逻辑器件实现的单稳态触发器脉宽控制能有效地实现激光引信电路系统小型化，提高电路的可靠性

True, this number is valid only with the survey with resolution reduced to 2,2 Mp.

诚然，这个数字是有效的只有在调查的决议减少到2，2支原体。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。