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- PFM (Pulse frequency munition) 脉冲频率调制
- Switching Power Supply has three kinds of control circuits: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Pulse Width and Frequency Modulation (PWM-PFM). 开关电源有三种控制方式：脉冲宽度调制(PWM)、脉冲频率调制(PFM)、脉冲宽度频率调制(PWM-PFM)。
- Hardware pulse distribution, and can be controlled stepper pulse frequency to the governor. 硬件脉冲分配方式，可以控制步进脉冲的频率来调速。
- Increase in intensity,retention time and the pulse frequency could enhance the efficiency. 增加磁场强度、处理时间和脉冲频率可以提高杀菌效果.
- Describes a new design of pulse frequency dividers in which timers NE556 and sequencecontrol unijunction transistors are used. 利用定时器NE556和程控单结晶体管，设计了一种新型多路脉冲分配器。
- Based on the model,the relationship between the main pulse frequency of supply power and the balanceable inter-electrode gap is discussed. 给出了脉冲电化学加工极间平衡间隙的数学模型,并据此讨论了高频群脉冲电化学加工中,电源主脉冲频率与平衡加工间隙的关系。
- Laser scribing of InSb with a Q switched Nd:YAG laser was studied in this paper and the relationship between pulse frequency and groove depth and width has been obtained. 研究了利用调 Q Nd： Y A G 激光对 In Sb 的激光划片，得出了刻槽深度和宽度与脉冲重复频率之间的关系。
- Multiple functions available : start/crater arc current, increase/decrease time,base/crest value current,pulse frequency,pulse rate,post flow time, HF welding. 功能丰富：起始/收弧电流、上升/下降时间、基值电流、峰直电流、脉冲频率、占空比、滞后关气时间分别可调，高频引弧。
- NEB delays the time of first ovulation through inhibition of LH pulse frequency and low levels of blood glucose, insulin and insulin-like growth factor-I (IGF-I). NEB可通过抑制LH脉冲频率、降低血浆葡萄糖、胰岛素和胰岛素样生长-1(IGF-I)因子浓度,从而造成奶牛分娩后首次排卵间隔延长;
- The Increase of pulse voltage and pulse frequency is beneficial to refinement and improvement of solidification structure of hypereutectic gray cast Iron. 脉冲电压的升高和脉冲频率的增大都有利于过共晶灰口铸铁凝固组织的细化和改善。
- Furthermore the dependence of etching current were proved on laser parameters(pulse number and pulse frequency) and that the excimer laser have the abili... 表明准分子激光在钝化区具有增强电化学特性的能力。
- The increase of current density and pulse frequency can be helpful to refine and improve the solidification microstructure of the pure aluminum at a given pulse current range. 在一定的脉冲电流参数范围内,电流密度增大和脉冲频率升高都有利于金属凝固组织的细化和改善。
- Acidizing fluids' type, concentration, jet pulse frequency, treatment time and interval treated may be selected according to degree of formation plugging. 该工艺可根据地层堵塞情况及程度,选择酸液种类、酸液浓度、射流脉冲频率、处理时间和处理层位。
- Acidizing fluids’ type, concentration, jet pulse frequency, treatment time and interval treated may be selected according to degree of formation plugging. 该工艺可根据地层堵塞情况及程度 ,选择酸液种类、酸液浓度、射流脉冲频率、处理时间和处理层位。
- Many parameters,such as current density,time on and off,pulse frequence,can be interceded in pulse electrolysis. 脉冲电解可以调解电流密度、电流的通断时间、脉冲频率等多个参数,为控制金属沉积层的质量和沉积速度提供了有力的手段。
- Multiple funcyions available:start/crater arc current,increase/decrease time,base,crest value current,pulse frequency,pulse rate,post flow time,HF/friction welding,water/gas cooling. 功能丰富：起始/收弧电流、上升/下降时间、基值电流、峰值电流、脉冲频率、占空比、滞后关气时间分别可调，高频/接触引弧、水冷/气冷可供选用。
- A new kind of time series, which is used as the ‘HRV Signals’ for the purpose of nonlinear dynamics analysis of HRV, is introduced based on the Integral Pulse Frequency Modulation (IPFM) model. 该时间序列对 于影响HRV的内在系统是一个更为直接的观察量，不但可以应用于非线性动 力学研究，还可以用于其它的一些分析方法。通过RR间期序列的功率谱与HRV 时间序列功率谱的对比，表明后者的功率谱具有较少的波峰数目和相对弱的宽 带特性，说明某些病例中RR间期的功率谱中的宽带特性是由于非线性观察函 数引起的，而不一定是系统内在混饨特性的反映。
- The result indicated that the pulse electric current can homogenize structure of Q235 steel,as the increase of pulse voltage and pulse frequency,the homogenization effect is enhanced. 结果表明,脉冲电流可以使Q235钢的正火组织均匀化。
- An unwanted false electronic pulse. 一种不希望有的假电子脉冲。
- The results showed that the survivability of E. coli decreased with the increase of electric field, pulse frequency and the initial temperatures, and increased with the increase of water velocity. 实验结果表明大肠杆菌的存活率随电场强度、频率、初始温度的增加而降低,随处理流速的增加而升高。
