有效数字

Field must be a valid number. Decimal points are not allowed.

列必须为一个有效的数字，不允许出现小数点。

On a calculator, the increase of the least significant digit in the result of a calculation by one if the highest decimal place dropped off has a value of more than zero.

在计算器中，如果计算结果舍弃的最高位十进位数字大于零，则剩余部分的最低有效位加1。

this paper proposes a design method which can improve the performance of fractional order differential filter obviously under the premise of not increasing the structure complexity of the filter.this scheme which bases on mutually compensatory characters of typical differentiator and uses interpolated method to improve performance of iir digital fractional differential filter.the improved frequency response of fractional differential filter is more close to ideal fractional differential filter,it indicates the validity of proposed method.

摘 要：提出一种在不增加分数阶微分滤波器复杂度的前提下，能有效提高分数阶微分滤波器性能的方法。该方法利用几种基于典型微分算子的分数阶微分滤波器之间的互补性，通过相互内插结合的方式，用于提高iir分数阶数字滤波器的性能。改进后的分数阶微分滤波器频率响应更接近理想分数阶微分滤波器，表明所提方法的有效性。

By example analysis and experiment result compare,it introduces the usage and peculiarity of Multisim 2001 software platform of EDA technology in design type of experiment study on digital circuits,the advantages and disadvantages of EDA technology experimenthave been compared with actual operation,the important of combining"imitation experiment"and"material experiment"in design type of experiment of digit circuit teaching is put forward in this paper.

目前，国内高校的数字电路实验教学模式主要以2种方式进行：一种是完全采用常规的TTL逻辑器件(如逻辑门、触发器等中小规模集成电路)进行硬件连线测试，大多采用面包板或由多个双列直插座组成的各种实验箱。这种方式容易出现器件接触不良，接线不慎而烧坏芯片、电源等故障，学生实验课时得不到有效利用，影响对学生综合设计性实验能力的培养与提高。

Using digital imaging cassette to record firingeffect instead of film cassette will effectively improve interpretation efficiency,precision, training quality and make automatic interpretation possible.

记录射击信息的数字影像可以有效地提高判读效率、精度，并为计算机自动判读奠定基础。

It is an effective way for protecting the security of digital media data.

是保护数字媒体信息安全的有效方法。

The experimental research results show: Synthetic aperture technique can improve the resolution of digital holography evidently.

结果表明，合成孔径技术是一种提高数字全息再现像的分辨率的有效方法。

Advanced digital simulation is one of the most effective ways to research large HVDC/AC hybrid systems.

采用先进的数字仿真系统对大规模的交直流混合电力系统进行研究是一个有效的途径。

Discrete Fourier Transform is used for digital signal analysis and processing.

离散傅立叶变换是数字信号分析和处理中常用而有效的手段。

However, as the number of ejector pins increases, the effective area available for cooling channel placement decreases.

然而，因为喷射器的数字别住增量，有效面积可利用为冷却渠道安置减少。

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。