METHODS: Exposed cutaneous branches rooted in rami posterior nervi spinalis and dominated muscles by exciding the median skin at the back of the rat's neck, given electric stimulation to the muscles by Low-frequency pulse transmitter. The output range was Voltage 0-40 V, frequency 1-111 Hz and pulse width 0-1000 ms.
切开大鼠颈后正中表皮，显露脊神经后支皮支及其所支配的颈部后外侧肌群，使用低频脉冲发射器对上述肌肉进行电刺激，发射器的输出范围为：电压0~40 V，频率1~111 Hz，脉宽0~1 000 ms。
Special structures for coherent FBG group and fiber MZI sensors are designed. For weak signals or strongly interferenced signals, winding method, flat layout method, special coated fiber method or spring separation method, solid separation method are proposed, and the recognition ability for object signals is improved. The physical features of the object signals are extracted from various aspects by the parameters analysis such as maximum amplitude, RMS, ringing count, pulse count, event count and duration, by the waveform transform analysis such as Fourier analysis, AR spectrum analysis and joint-time-frequency analysis, and by statistic analysis of the parameters analysis results or waveform transform analysis results. And the features of different object signals are extracted when the optical fiber sensing systems are applied for railway location, axel counter, fence destruction monitoring and pipe destruction monitoring. Auto-recognition of the railway location signals with coherent FBG sensing system is realized by a linear discrimination function based on Fisher criterion. And auto-recognition of the fence destruction signals with a MZI sensing system demodulated by a 3×3 coupler is realized by a LMBP neural network.
对相干FBG组及光纤MZI传感器的具体结构进行了设计，分别针对微弱振动信号及强干扰信号，采用缠绕法、平面法、特殊材料涂覆光纤及弹簧隔离法、整体隔离法等设计光纤传感器，提高了对目标信号的识别能力；通过提取信号最大幅度、有效电平、振铃计数、脉冲计数、事件计数、持续时间等参数，对信号进行傅立叶谱分析、AR谱分析、时频分析，并对不同参数及频谱分析结果再进行分布统计分析，实现了多角度的信号物理特征提取，应用于列车区间定位、列车计轴、围栏破坏性行为监测、管道破坏性行为监测等场合，实现了各种不同目标信号的特征提取；采用基于Fisher准则的线性判别函数，实现了基于相干FBG组传感系统的列车区间空闲或占用的自动识别；采用LMBP人工神经网络，实现了基于3×3耦合器解调的MZI传感系统的围栏破坏性行为的自动识别。
So when the work of the poor, which would create a unijunction transistor pulse frequency instability (signal is taken from the CFA BG2 electrode voltage), main circuit operating voltage is unstable and the motor speed.
因此当该惯处事不良时，即会变成独结晶体惯不收回的脉冲频率不安不退(暗记存自不收大惯BG2，集电极的电压)，从而引起宾电路处事电压不安不退，电机转速不稳。
This invention relates to envelope impulse control PWM technique, it can occur envelone impulse used for working process. It has two type main circuit in secondary winding of high frequency transformer, so the pior power frequency transformer set in electrospark pulse power system is eliminated.
本发明采用包络脉冲控制PWM技术，去掉了电火花脉冲电源中传统的工频变压器，可直接产生出加工用的包络式脉冲，在高频变压器的副边有两种形式的主回路。
The carrier wave signal is frequency modulated by a non linear function which makes the pulse sweep through a range of frequencies, often called a chirp.
载波信号通过非线性频率调制使得脉冲扫描通过一系列的频率范围，通常称为线性调频脉冲。
Objective To evaluate the influence of power, irradiation time, pulse energy and frequency of pulsed Ho∶YAG laser on its biological effects.
目的 为研究平均功率、照射时间、脉冲能量、脉冲频率等激光参数对Ho∶YAG激光生物效应的影响。
One of the few known techniques is jet-engine modulation, which involves analyzing the raw radar return for the characteristic beat produced by a combination of the radar-pulse frequency and the rotating blades of the engine. This technique is already used on operational radars (including the APG-70 in the F-15) but is vulnerable to countermeasures and dependent on target aspect.
由于Northrop Grumman APG-77主动数组火控雷达与 Sanders ALR-94整合式电战／被动电磁讯号截收系统的搭配是如此强大绝伦，美国方面认为光靠这两者组合便再配合上猛禽本身的匿踪性能，便足以让F/A-22在绝对安全的距离外率先发觉识别并追踪锁定任何已知对手，没有必要再去锦上添花地安装光电侦搜系统。
A novel scheme for realizing a two-qubit quantum SWAP gate in ion-trap systems is proposed. We consider two three-level ions which are confined in a linear trap interact with two different frequency laser pulse in the case of resonant.
提出了一个利用处在线性阱中的两个全同的三能级离子与两个不同频率的激光脉冲共振相互作用来实现两比特量子SWAP门的方案，该方案是根据Haffner H。
Methods Mitral annular motions in 35 cases of normal subjects form apical four-chamber view and two-chamber view were detected with DTI-2D and pulse frequency spectrum. At the same time, compared them with the peak velocity and time velocity integrals of every endocardial myocardium middle segment of LAT and POST-SEP form apical four-chamber view, ANT and INF from apical two-chamber, ANT-SEP, POST from LV long-axis view.
通过DTI-二维及脉冲频谱显示方式检测35例健康成人，心尖四腔观和二腔观二尖瓣环的运动，并与心尖四腔观外侧壁、后间隔；心尖二腔观前壁、下壁；左心长轴观前间隔、后壁各中段内膜面的峰值速度、时间速度积分进行比较。
Under the application of high frequency or high pulse, we recommend to use the polyprogylene film capacitor or MPES stacked capacitor.
在高频或高脉冲条件下使用的电容器，我们推荐聚丙烯膜电容器或MPES叠片式电容器。
Under the application of high frequency or high pulse, we recommend to use the polyprogylene film capacitor or CL23B stacked capacitor.
在高频或高脉冲条件下使用的电容器，我们推荐聚丙烯膜电容器或MPES叠片式电容器。
DongGuan Xiangyikang Electronics Technology Co., Ltd was established in 2005 year. We specialized in design, manufacturing and sales Hi-frequency transformer, pulse transformer, linear filter, coil inductor, communication and wide band data transformer, Lan filter, RJ45 connector etc. The products widely used for DC/DC adaptor, medical machine, electronic equipment in home, Lamp equipment in home, digital communication, DVR, personal computers etc.
东莞翔艺康科技有限公司，创建于2005年，专业开发设计，生产以及销售高频变压器、脉冲变压器、线性滤波器，电感线圈以及通讯，宽带数据变压器和网络匹配滤波器，RJ45连接器等电子元器件，产品广泛应用于DC/DC转换器，医疗仪器，家用电器，民用灯具照明和数码网络通讯，安防产品，电脑资讯产品等。
In the paper, the sequence of inverse Fourier transformation of wavelet low-pass filters is multiplied by the filter pulse sequence, thus filtering the frequency-domain signal using wavelet filters. This method can be used to smooth the filter`s transmission band and reject high frequency components, thus reducing the error and improving the anti-aliasing capacity of low-order filters.
文章以小波低通滤波器H的逆Fourier变换所得的序列同滤波器脉冲序列相乘，相当于小波对滤波器的频域信号进行滤波，在滤波器阶数不高的情况下，能起到平滑滤波器通带频谱，抑制高频成分，达到减小误差及增强抗混叠能力的作用。
Zhucheng Shenfeng造纸机械厂main products: water pulper equipment (low concentration of hydraulic pulper, the high concentration of hydraulic pulper, D-hydraulic pulper, to drum hydraulic pulper), Refining Relief equipment (Roll-grinding machine, single-effective fiber separator, Double-Disc refining machines, high concentration of refining, Li seminal plasma horizontal plane), filter purification equipment (dual-screen drum pulse low net sieve, flow Pressure on the screen, cylindrical screen, high-frequency vibration box sieve), deinking equipment (all closed flotation Deinking machine, the trough flotation Deinking efficient machines, exhaust-Deinking machine), washed enrichment equipment (enrichment Machine, sludge dewatering machine, washing machine, screw propeller), the paper machine and ancillary equipment (toilet paper machines, pneumatic scraper, dryer, Slitter, embossing machine, pump).
诸城市申丰造纸机械厂主要产品有：水力碎浆机设备（低浓水力碎浆机、高浓水力碎浆机、D型水力碎浆机、转鼓式水力碎浆机），磨浆疏解设备（搓磨分丝机、单效纤维分离机、双盘磨浆机、高浓磨浆机、立卧式精浆机），筛选净化设备（双筛鼓低脉冲网前筛、内流压力筛、圆筒筛、高频振框筛），，脱墨设备（全封闭浮选脱墨机、方槽式高效浮选脱墨机、抽气式脱墨机），洗涤浓缩设备（浓缩机、污泥脱水机、漂洗机、螺旋推进器），纸机及配套设备（卫生纸机、气动刮刀、烘干机、分切机、压花机、浆泵）等。
it is necessary to divide frequency of encoder pulse in ac servo systems.
在交流伺服系统中对码盘脉冲信号进行小数分频有其必要性。
According to the semi-active laser guidance weapon`s technology status that its pulse repeating frequency coding is easily interfered, a new idea of laser pulse width coding is proposed to improve its anti-interfering capability.
针对现有的激光半主动制导武器系统采用脉冲重复频率编码易受干扰的技术现状，提出了采用激光脉宽编码技术提高其抗干扰性能的新构想。
According to the semi-active laser guidance weapon`s technology status that its pulse repeating frequency coding is easily interfered, the possibility of high repetition rate laser interference with semi-active laser guided weapons operating based on real-time gate signal was studied. The technology principal of laser pulse width coding is analyzed, and the influence of real-time gate signal is discussed.
针对现有的激光半主动制导武器系统采用脉冲重复频率编码进行制导易受干扰的技术现状，研究了激光半主动制导武器选用实时波门选通信号技术制导的可能性，就激光半主动制导武器接收系统的解码脉冲的宽度进行了理论研究，讨论了选取不同的解码脉冲宽度对激光导引头制导效果的影响。
In this way, you control how'lean'your mixture is by the strength of the pulse (ie'fatness'at the optimum pulse frequency).
在采用这种方式，您如何控制'精益'你的混合物，是由强度的脉冲（即'肥胖'的最佳脉冲频率）。
To compare with the traditional constant current capacitor charging power supply, the series resonance capacitor charging power supply which is developed in recent years has a more constant current, small volume, high efficiency, high power density and its suitable for variable capacitor load in a large range. so it is very suitable for capacitor charging power supply and can satisfy the demand of the repeat frequency pulse power technology.
近年来发展起来的串联谐振充电电源与传统直流电源相比较，具有恒流充电、体积小、效率高、功率密度大、适合宽范围变化的负载等优点，是较为理想的电容器充电电源，能更好的满足当前重复频率脉冲功率技术下对电容器充电电源的要求。
Several key technologies in the fields of Nuclear Magnetic Resonance radio-frequency pulse design and Magnetic Resonance Imaging were investigated.
本论文着重研究和解决核磁共振射频脉冲设计以及磁共振成像方法学中的若干关键问题。