Still, the mathematical models used to rank results are usually some variation of the common term-frequency/inversed document frequency model, which is well-mapped territory.
尽管如此，用于排序结果的数学模型通常是常用的词频/倒排文档频率模型的变体，而对于这种模型，已有很好的研究基础。
Electrical characteristics may vary depending on changes in temperature and frequency. Please consider this variation when you design circuits.
设计线路板时应考虑到电容器的电性能可能随温度和频率的变化而变化。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.
基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。
Discriminator: a device that converts a property of an input signal such as frequency or phase into an amplitude variation depending on how the signal differs from a standard or reference signal.
鉴别器，鉴频器：一种将输入信号的某一特征，如频率或相位转变为幅度变化装置，其变化大小因信号与标准或参考信号的不同程度而异。
So, in engineering computation it is acceptable to neglect the directional variation of coherence value with frequency.
因此在工程计算中不计相干函数随频率的变化不会带来太大的误差。
The authors propose an additional control strategy, which changes the power or current order according to the variation of system frequency, thus the power balance of the grid can be implemented.
提出了一种附加控制策略，该附加控制策略根据系统频率的变化改变直流系统的功率或电流指令，从而实现系统功率的平衡。
The frequency of variation and utilization of exogenous DNA introduction in rice breeding were also discussed.
同时讨论了外源DNA导入水稻的变异频率和在水稻育种中的应用前景。
The FM response magnitude and phase variation effects laser on the high speed frequency switching.
FM响应的大小和相位变化影响激光器的高速频率交换。
The results show that the deposit rate, composition and properties of coating change with the variation of duty ratio and pulse frequency.
结果表明，镀层的沉积速率、镀层成分及镀层的性能都随脉冲频率和占空比的变化而变化；
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency locking property when system transits from chaotic to great periodic motion.
利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
The variation of corner frequency and stress drop with time are analyzed, and the relations between focal parameters are discussed.
分析了拐角频率和应力降随时间的变化趋势，并讨论了震源参数相互之间的关系。
The improved algorithm can track frequency variation of the time-varying signal with no extra calculation burden.
对算法进行了改进，在不增加计算量的情况下，实现了对频率变化的跟踪。
It shows that the stochastic dispersion variation connected with frequency affects the frequence and the position of the black soliton.
结果表明：只有与频率有关的随机色散变化对黑孤子的频率和位置产生影响。
The variation trend of estimated frequency and signal-to-noise reflect the work course off use from different side.
估计频率的变化和信噪比的变化趋势从不同的侧面反映了引信工作的历程。
The appropriative test menu for "power frequency variation" is normally built in domestic relay protection test instruments, but it should be calculated and set beforehand for imported instruments.
国产继电保护试验仪一般都有针对工频变化量的专用测试菜单，而进口仪器则需预先计算和设置。
This paper probes the features of the effect on the external stores jam flutter characteristics due to the variation of parameters of vibration frequency, flutter freedom and generalized mass.
探讨了由于振动频率、颤振自由度、广义质量等参数的变化对机翼—外挂干扰颤振特性影响的一些特点。
The results show that the non-linearity is mainly attributed to a thermal fluctuation magnetic after effect and a numerical variation of the magnetic domain with frequency.
结果表明，非线性主要来源于热起伏磁后效和为了降低微涡流损耗而引起的磁畴数随频率的变化。
When the variation of bus-bar voltage and frequency occurs, the reliability of electric motors, transformers, control and protection system is analyzed in this thesis.
当电网电压和频率的变化时，分析了电动机、变压器、控制及保护系统、照明系统、通信导航设备等受电器工作的可靠性。
Then the characteristics of frequency variation during the fatigue crack propagation process are simulated by three - dimensional dynamic finite element analysis.
并利用三维动态有限元模拟了点焊接头疲劳裂纹扩展过程中频率变化特性。
The variation of temperature coefficient of resonator frequency with tolerance factor was discussed.
分析了谐振频率温度系数随容忍因子的变化关系。
When vehicles passing ring coil detector, the interaction of vehicle body's substance and ring coil changes resonant frequency of the ring coil and forms a curve of frequency variation.
车辆通过环形线圈检测器时，车体物质与环形线圈相互作用改变了线圈的谐振频率，从而形成频率变化曲线。
The variation of frequency curve's mode peak content with the increasing of depth, shows not only the trend of chemical weathering but also variation gradient of weathering extent.
频率曲线众数峰含量随深度的变化，不但指示了化学风化趋势，而且反映了风化程度的变化梯度。
The paper studied the issue of low frequency in shallow parts of cross-hole seismic reflection sections using imaging principle and deduced frequency variation factor.
本文利用成像原理对井间地震反射剖面的浅部频率变低问题进行了研究，导出了频率变化因子。
Feed roller is driven by an electronic frequency converter which permits stepless variation of its speed and is controled to be synchronized with doffer by the computer.
给棉罗拉采用调频电机传动，实现无级变速，通过计算机控制与道夫传动同步。
The variation of structural frequency before and after the damage is believed to be a most available and widely used modal parameter because of its easy testability and high measure precision.
由于结构频率测试容易测试并且有较高的测量精度，因此成为损伤识别中广泛应用的模态参数。
A method for damage positioning is developed on the basis of testing the variation ratio of squared frequency.
介绍了基于频率变化平方比的损伤定位方法。
The variation of respiratory frequency was not significant.
呼吸频率无明显变化。
The variation of respiratory frequency was not significant.
呼吸频率无明显变化。
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