脉冲频率

基于DDS的滑移脉冲频率产生电路设计

Circuit design of a slip pulse frequency generator based on DDS

但LH的脉冲频率和幅度不受上述处理的影响。

However , LH pulse frequency and LH pulse amplitude were unaffected by treatments .

电流脉冲频率对TIG焊电弧影响机理的研究

Mechanism of Pulse Current Frequency Effect on TIG Arc

不同脉冲频率的半导体激光对荷肉瘤180小鼠血清IL-2含量和肿瘤生长的影响

Effect of Different Pulse Frequency Diode Laser Irradiation on IL-2 of the Sarcoma 180 Tumor-bearing Mice

Chirp子脉冲频率步进雷达信号的探讨

Study on Chirp Subpulse Stepped Frequency Radar Signal

分析了PFM光发射机设计中的一项关键技术，即脉冲频率调制。

The PFM as the key technology in the PFM optic transmitter is discussed .

以高距离分辨力和频率分集为基础，采样了Chirp子脉冲频率步进信号解决多径效应的方法。

For this , the paper bring forward the chirp sub-pulse stepped frequency signal on high remove resolution and frequency diversity .

通过对样品电流（I）-电压（V）特性的测量，研究了脉冲频率、扫描次数和扫描路径对薄硅片电学性质的影响。

After measuring I-V characteristics , the influence of processing parameters , such as pulse frequency , scanning times and scanning path on electrical properties of thin silicon sheet is investigated .

用加速器作为ICT系统的射线源，必须保证加速器射线脉冲频率与CT数据采集周期同步。

It is very important to synchronize the ray pulse frequency of accelerator with data acquisition cycle of Industrial Computed Tomography ( ICT ) when using accelerator as ray source .

FCM模型放电脉冲频率随着直流电刺激的变大而变大，产生的动作电位有明显的大小变化。

The firing frequency of FCM model was increasing by the larger of direct electrical stimulation , and the size of generated action potential had obvious change .

对不同脉冲频率的镀层进行了光催化性能的测试，研究了脉冲频率和TiO2含量对光催化性的影响规律。

Of different frequency and content of the coating TiO2 photo catalytic properties were tested to study the pulse frequency and photo catalytic TiO2 content of the impact of the law .

介绍了脉冲频率调制（PFM）光纤视、音频传输系统的原理并对关键功能电路模块作简要分析。

This paper introduces the principle of PFM optical fiber video & audio transmission system and simply analyzes the main function circuit modules .

脉冲频率调制又包括了两种方式，即等宽PFM和SWFM。

The PFM technology includes two kinds modes : constant width PFM and SWFM .

还对Chirp子脉冲频率步进信号中距离像的混叠和冗余问题进行了分析，指出这些现象是Chirp子脉冲频率步进信号对不同参数的选取引起的。

This dissertation analyses problems of profile aliasing and redundance in chirp-subpulse stepped frequency signal , points out that these problems are resulted from different parameters of chirp-subpulse stepped frequency signal .

利用X射线衍射（XRD）仪和扫描电镜（SEM）等研究了直流脉冲频率对膜层生长、相结构及显微结构的影响。

Scanning electron microscopy ( SEM ) and X-ray diffraction ( XRD ) were employed to characterize the microstructure and phase composition of coatings . The result shows that the coating growth rate is dependent on the pulse frequency .

它在重载下工作于电流控制模式，轻载下工作于脉冲频率调制（PFM）模式来降低功耗。

It operates both in current mode at high output load and in pulse frequency modulation ( PFM ) at light load to reduce the power dissipation .

Chirp子脉冲频率步进信号是一种距离高分辨率信号，目标运动对这种信号的影响很大，必须对其进行运动补偿。

The chirp-subpulse stepped frequency radar signal is a signal of high range resolution . The target motion is a main factor influencing on synthetic range profiles , so velocity compensation is demanded .

研究发现，MgO薄膜的结晶性主要受控于衬底温度和激光能量密度，而薄膜的生长速率则依赖于脉冲频率、衬底与靶材间的距离以及激光能量密度。

It is found that MgO films ' crystallinity is mainly affected by substrate temperature and laser fluence , while the growth velocity of MgO films is dominated by pulse frequency , substrate-target distance and laser fluence .

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；

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 ) .

文中总结了Chirp子脉冲频率步进信号参数选取的方法，提出了采用参数选取和目标抽取相结合的方法来解决Chirp子脉冲频率步进信号中距离像的混叠和冗余问题。

This dissertation summarizes the method to select parameters of chirp-subpulse stepped frequency signal , presents a method to resolve profile aliasing and redundance in chirp-subpulse stepped frequency signal by the target pick-up algorithm and selecting parameters .

本文提出了心率变异性（HRV）信号的一种改进的积分脉冲频率调制（IPFM）的计算机仿真模型。

An improved integrated pulse frequency modulation ( IPFM ) model of Heart Rate Variability ( HRV ) by computer simulation is presented .

结果表明：两相界面测量的偏差在±4mm以内，脉冲频率测量的相对偏差在2%以内，存留分数测量的相对偏差在±5%以内。

The measuring deviation for two phase interface is within ± 4 mm . The relative measuring deviations are within 2 % for pulsation frequency and within ± 5 % for hold up , respectively .

当脉冲频率大于10kHz时，脉冲频率增加，电弧最大轴向压力减小。

When the pulse frequency is over 10 kHz , the maximum axial pressure of high frequency arc decreases with the increase of pulse frequency .

相比之下，虽然电流密度、占空比和脉冲频率等工艺参数对Sn-Bi钎料成分的影响较小，但是却在一定程度上影响了沉积钎料的表面形貌。

In contrast , the process parameters such as current density , duty cycle and pulse frequency have little effect on the composition , but do affect the surface morphology to some extent .

介绍了一种用于弱电流测量中的I-F变换电路，它将输入的电流信号直接变换为脉冲频率输出，然后送入计数器计数和送入计算机处理。

This paper describes the I-F converter ( current-frequency converter ) in the weak current measurement . The input current signal is converted into pulse frequency , and then processed by computer .

分析了放电能量使气体加热对激光输出的影响，均匀的横流技术使激光器在每秒16个脉冲频率下获得18W平均功率输出。

The effects of gas heating caused by gas discharge on the laser output power were analysed theoretically . Maximum output power of 18 W at 16 pps was obtained with uniform transverse flow technology .

实验采用铂、金、镍、银和钯5个电极组成的阵列组，在脉冲频率0.1Hz，1Hz和10Hz3个频率下，采用主成分分析对6个不同品牌的同种干红葡萄酒进行初步辨识区分。

Six different brands of claret ( produced by the same grape species ) were successfully discriminated by main compositions analysis through a sensor array of platinum , gold , nickel , silver and palladium electrodes at different frequency of 0.1 Hz 、 1 Hz and 10 Hz .

变化脉冲频率的计算机测量方法

Methods to Measure the Variable Pulse Frequency by Using Computer

脉冲频率与抑制强度间存在线性关系。

The suppression strengthens while the frequency of impulse increases .

音视频脉冲频率调制光纤传输系统的研制

Design for PFM Fibre Optic Audio & Video Transmission Systems