1.To reduce the volume of medium frequency transformer, the paper proposes two topologies of DC-HFAC (high frequency alternating current) -DC-MFAC (medium frequency alternating current) high frequency link and cycloconverter high frequency link. The simulation shows that the method is correct.
由于油田中频变压器体积庞大,运输和安装困难,论文提出应用两种新型的拓扑结构DC-HFAC(high frequency alternating current)-DC-MFAC(medium frequency alternating current)高频链和周波变换器(cycloconverter)高频链代替传统中频加热电源,减小变压器体积,并仿真了这两种电路拓扑的工作波形。
2.The main stimuli were pure tones with duration 200 ms,frequency ranged from 50 Hz to 3 000 Hz. Extracellular action potentials were discriminated using a level-crossing detector (SD1,Tucker-Davies Technologies). The characteristic frequency (CF) and frequency response area were determined by making automated frequency-intensity plots.
双耳给予持续时间200ms的纯音,频率范围为50～3000Hz,用Level-Crossing Detector (Tucker-Davies Technologies)记录神经元单位的特征性频率,频率反应面积(Frequency response area)及围刺激时间柱形图(Peristimulus time his-togram)。
3.3. Cycle frequency-based blind beamforming shows the performance degradation due to CFE (cyclic frequency error). An improved algorithm is presented in literature 6, which adopting forgetting factor in estimation cyclic correlation matrix would largely depress the sensitivity of CAB to cyclic frequency error. By using this method, the improved algorithms of the C-CAB and ECAB algorithms are presented in this dissertation.
3．针对基于循环频率的盲波束形成算法对循环频率误差CFE(cyclic frequency error)很敏感而导致算法性能下降的情况，参照文献[6]提出的遗忘因子CAB算法，提出了C-CAB算法以及基于特征空间的盲波束形成算法(ECAB)的改进算法。
4.In recent years, Micro-electro-mechanical System (MEMS) has been developed drastically. MEMS technology applied in radio frequency communication field, which is known as RF-MEMS (Radio Frequency Micro-electro-mechanical System), has great potentials. RF-MEMS research has become very important in application of radio frequency, and drawn attention of academy and governments greatly.
近年来,微机电系统(MEMS)研究得到了迅猛的发展,用于射频通信领域中的MEMS技术,即RF-MEMS (Radio Frequency Micro-electro-mechanical System)技术蕴藏着巨大的市场潜力,已经成为研究的热点,受到学术界和政府部门的高度重视。
5.Single Frequency Operation of Diode-pumped Intracavity Frequency Doubled Nd:YAG Laser with Tilted KTP Crystal: Theoretical Study
Single Frequency Operation of Diode－pumped Intracavity Frequency Doubled Nd：YAG Laser With Tilted KTP Crystal： Theoretical Study
6.The electromagnetic fields including X-ray, y-ray, high frequency electromagnetic field (HFEMF) , nuclear electromagnetic pulse (NEMP), extremely low frequency electromagnetic fields (ELF-EMF). With the development of electrical technology, the possible health hazard of exposure to electromagnetic fields has become an issue of considerable public concern.
电磁波的波谱范围较为广泛，从具有电离作用的X射线、γ射线，到用于通信的射频电磁波等高频电磁场(High frequency electromagnetic field,HFEMF)，核电磁脉冲(Nuclear electromagnetic pulse,NEMP)，再到我们日常使用的50-60赫兹(Hz)的电力线发出的极低频电磁场(Extremely low frequency electromagnetic fields,ELF-EMF)都属于电磁波的范畴。
7.The magnetic fields with frequency of 100 Hz and intensity up to 100 gausses are known as the field magnetic extremely low frequency (ELF).
频率在100Hz,强度最高达100高斯的磁场被称为超低频磁场(Extremely Low frequency,ELF),它对于细胞膜有着特殊的影响,能够改变细胞膜两侧的离子分布,从而在某些创伤或是变性的组织产生的炎症反应中表现出治疗效应.
8.A new data transforming method of D/F(digital to frequency conversion) was adopted to export frequency in the novel digital Coriolis mass flowermeter.
对新型全数字式科氏质量流量计频率输出信号采用数字—频率转换D/F(Digital to Frequency Conversion)方法实现.
9.The research including:1) Design of pipelining 32-bit frequency-phase accumulator with LFM(Linear Frequency Modulation);
主要研究内容包括:1)可以实现LFM(Linear Frequency Modulation)功能的32位流水线相位累加器的设计;
10.Extremely low frequency (ELF) fields (>0 to 300 Hz) are one kind ofelectromagnetic fields, which are common used in people?s daily life.
极低频电磁场（extremely low frequency electromagnetic fields，ELF-EMF）是指频率在0-300Hz之间的电磁场，是与人们日常生活关系最为密切的电磁场之一。
