查询词典 difference frequency

Partition search follows this strategy: construct a data structure for quick search and location, and divide the (K-1)th frequency itemset sequence into a number of continuous partitions to obtain a number of disjoint sub-sets of (K-1)th order frequency itemset.

分区查找基于以下策略：建立一种可快速搜索定位的数据结构，将频繁(K-1)-项集序列划分为若干连续的分区，形成(K-1)阶频繁项目集的若干不相交的子集。

The1Hz~lMHz input measured pulse signals of the digital frequency meter can be used for measuring frequency, period, pulse width and duty ratio,etc.The test results stably display 3 seven-segment numeric tubes, and the measuring ranges may be switched over automatically. The measuring error is equal to or less than 0.1％.

该数字频率计的lHz～1MHz输入被测脉冲信号具有频率测量、周期测量、脉宽测量和占空比测量等多种用途；其测试结果由3只七段数码管稳定显示，测试量程可自动切换、测量误差小于等于0.1％。

The natural frequency can be calculated using the numerical value method for the equation and a facility method to solve the natural frequency of chain structures is obtained.

建立了随机性结构参数的链式机械系统动力特性分析模型，利用Monte Carlo数值模拟方法获得系统的特征值随机变量的数字特征。

It carries out the amplitude-preserved migration with the phase shift amplitude-preserved correction operator in frequency-wave number domain and time shift amplitude-preserved correction operator in frequency-space domain.

文中引入了裂步傅里叶保幅偏移算法，分别通过频率－波数域的相移保幅校正算子和频率－空间域的保幅时移校正算子实现了保幅偏移。

We also divided type 2 diabetic patients into three groups defined by examination of direct ophthalmoscopy which consisted of diabetes without retinopatliy(56),with simple tetinopathy(90)and with proliferate retinopathy (12).We compared the genotypes frequency and allele frequency among groups.

根据眼底镜检查将2DM分为无视网膜病变组（56例）、单纯型视网膜病变组（90例）、增殖型视网膜病变组（12例）三组，比较上述各组间基因型和等位基因频率分布有无差异。

It is found that the change of the frequency characteristics of chaotic system occurs mainly at the frequency band of the chaotic system, in which the input signal exists. The amplitude of the input signal doesn't influence the distortion of the output signal when masking signal is extracted by Oppenheim's chaotic masking.

研究发现，混沌系统频率特性的变化主要发生在输入信号的频率位於混沌系统频带内的情况下；输入信号幅度的大小，不影响输出信号的失真。

In this paper the light frequency shift of an optically pumped Cs beam frequency standard is reported and analyzed.

介绍了光抽运铯束管的光频移测量的原理和结果，并对结果进行了简要的分析，估算了射入Ramsey腔的相应光强。

The space quadrature vector oriented control can decouple between output current and frequency of the inverter by Park transformation, which guarantee the quite high accuracy of the 90 degree phase angle between the two-phase output current that supply for two phase electromagnetic stirrer in quite low frequency.

提出了一种基于空间矢量定向的二相电磁搅拌器逆变电源的结构和控制策略，该逆变器采用六桥臂式主电路拓扑结构，逆变器的第三相桥臂与两相电磁搅拌器的中点相连。

The peak radial spatial frequency and the halfpeak radial spatial frequency range corresponding to each item of the orthogonal polynomials were calculated.

利用傅里叶变换得到了Zernike多项式和环扇域内正交多项式的功率谱密度分布，以及正交多项式每项所对应的峰值径向空间频率和半峰值径向空间频率范围。

Studies show that the system has almost the same frequency spectrum efficiency as the orthogonal frequency division multiplexing system.

研究表明该系统有着和正交频分多址复用系统同样的频谱利用率。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。