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频率覆盖    
相关语句
  frequency coverage
    With the further development on the Astronomy and navigation of interplanetary spacecraft, the incremental improvements are expected on the VLBI that is real-time, high sensitivity, reliability and more frequency coverage.
    由于天文和深空探测的需求,决定了VLBI的发展方向为实时性、高灵敏度、高可靠性和更宽的频率覆盖,这对VLBI设备提出了新的要求。
短句来源
    In the design of radar reconnaissance receiver, generally have the characteristics including broadband instantaneous frequency coverage, good sensitivity and dynamic range, simultaneous signal detection, and fine frequency measurement.
    在雷达侦察接收机的设计中,一般要具有瞬时宽带频率覆盖、高的灵敏度和动态范围、检测同时到达信号,以及高的测频精度和频率分辨率等性能要求。
短句来源
    For the full-circle case,the array can be thinned up to the least redundant number,which can never be reached by the most popular Y shaped array configuration under same spatial frequency coverage constraint.
    对于全圆周天线而言,与Y形天线阵结构相比,在同样的空间频率覆盖范围内,全圆周天线阵使天线单元数达到了最优.
短句来源
  frequency coverage
    With the further development on the Astronomy and navigation of interplanetary spacecraft, the incremental improvements are expected on the VLBI that is real-time, high sensitivity, reliability and more frequency coverage.
    由于天文和深空探测的需求,决定了VLBI的发展方向为实时性、高灵敏度、高可靠性和更宽的频率覆盖,这对VLBI设备提出了新的要求。
短句来源
    In the design of radar reconnaissance receiver, generally have the characteristics including broadband instantaneous frequency coverage, good sensitivity and dynamic range, simultaneous signal detection, and fine frequency measurement.
    在雷达侦察接收机的设计中,一般要具有瞬时宽带频率覆盖、高的灵敏度和动态范围、检测同时到达信号,以及高的测频精度和频率分辨率等性能要求。
短句来源
    For the full-circle case,the array can be thinned up to the least redundant number,which can never be reached by the most popular Y shaped array configuration under same spatial frequency coverage constraint.
    对于全圆周天线而言,与Y形天线阵结构相比,在同样的空间频率覆盖范围内,全圆周天线阵使天线单元数达到了最优.
短句来源
  frequency covering
    Research on Counterexamples of 4-colored Problem and Frequency Covering on Civil Aviation's Airspace
    四色问题反例研究与民航空域频率覆盖
短句来源
    The model of propagation prediction and frequency covering is one of the important part in this system.
    电波传播预测及频率覆盖是无线电管理GIS系统的重要组成部分。
短句来源
  frequency changing
    An example of HF VCO, whose frequency changing range is 40.2 to 70.2 MHz is given to illustrate themethod of circuit parameter design and experiment data.
    文中给出了一个频率覆盖范围为40.2~70.2MHz的高频压控振荡器实例,并介绍了电路参数设计方法和实验数据.
短句来源
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  frequency coverage
The high resolution and high sensitivity as well as the broad frequency coverage of the infrared spectrometer are demonstrated in the absorption spectra of some organic gas molecules.
      
Its wide frequency coverage, superb receivers and flexible spectrometer will ensure that its potential is met.
      
The dynamical, physical and chemical processes which lead to planet formation constitute an astrophysical domain which will strongly benefit from ALMA in terms of frequency coverage, sensitivity and angular resolution.
      
A new radio spectrometer, Solar Broadband Radio Spectrometer (SBRS) with characteristics of high time resolution, high-frequency resolution, high sensitivity, and wide frequency coverage in the microwave region is described.
      
The proposed circuit allows the tuning gain to be lowered by deploying the coarse/fine frequency tuning whilst maintaining wide frequency coverage.
      
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A Super-regenerative NQR Spectrometer has been described. The Super-regenerative oscillator constructed by field effect transistors works in wider frequency range and has higher sensitivity, The 13Cl and 57Cl NQR Spectra of Some shemical samples recorded with this spectrometer are shown in this paper, and the advantages of using field effect transistors for NQR are discussed.

本文描述了一台场效应管超再生核四极共振谱仪的工作原理和性能;谱仪的振荡检波级是作者研制的一个频率覆盖范围较宽、灵敏度较高的场效应管(FET)超再生振荡检波器。文中还给出用本谱仪显示、记录的部分化学样品中的~(35)Cl核和~(37)Cl核的核四极共振(NQR)谱,并对使用场效应管的超再生振荡检波器的灵敏度作初步探讨。

In this paper the forms of the vibration disturbance inside the epicyclic gear trainare analysed.The frequency equations for the internal disturbance of the epicyclicgearing with one or two degrees of freedom have been built.The latter of them is a3-dimension problem,and the range of the disturbance frequencies covers a series ofplanes inside the 3-dimension space.As a result,the chance to cause the system reso-nance is developed.The calculation results indicate that in the design process of theshaft system,the...

In this paper the forms of the vibration disturbance inside the epicyclic gear trainare analysed.The frequency equations for the internal disturbance of the epicyclicgearing with one or two degrees of freedom have been built.The latter of them is a3-dimension problem,and the range of the disturbance frequencies covers a series ofplanes inside the 3-dimension space.As a result,the chance to cause the system reso-nance is developed.The calculation results indicate that in the design process of theshaft system,the chance of resonance can be reduced by turning the dynamicparameters.

分析了周转轮系内部存在的振动干扰形式.推导出单自由度及差动周转轮系的内干扰频率方程,后者(差动轮系)是三维问题,干扰频率覆盖范围是空间中一系列平面族,使传动轴系出现共振的机会大增.实例计算表明,可以通过动力学参数调整,减少共振出现次数.所给出的内干扰频率计算公式.对于诊断传动轴系故障有参考价值.

This paper simply presents the development of the miniature of quartz crystal res-onators, and in detail introduces the designs of JA7 seris of quartz crystal resonators, the pro-cedures in making them, and the performanes of experimental samples. The initial use case ofthese products are also described simply in this paper. Their frequencies range over a widefield of 8~350MHz. The frequeney deviations from manufacture are within±10ppm. Theones from temperature are within±50ppm at a wide temperature range of...

This paper simply presents the development of the miniature of quartz crystal res-onators, and in detail introduces the designs of JA7 seris of quartz crystal resonators, the pro-cedures in making them, and the performanes of experimental samples. The initial use case ofthese products are also described simply in this paper. Their frequencies range over a widefield of 8~350MHz. The frequeney deviations from manufacture are within±10ppm. Theones from temperature are within±50ppm at a wide temperature range of -55~90℃.The small deviations of±5ppm, ±10ppm may be achieved, when the operation temperatureranges are 0~60℃, -20~60℃ respectively. The microminiature quartz resonator hassmall volume: only 8×8×3.2mm~3 and 8×6.5×3.2mm~3. Its weight is less than 0.4g, andthe quality is stoble and reliable. They are good electronic components in removable electron-ic devices for communication.

本文简要介绍石英晶体谐振器小型化的发展概况,较详细地介绍了J_(A7)系列石英晶体谐振器的设计、制造工艺及试验样品的性能,对该产品的初步应用情况也作了简单说明。该产品的频率覆盖范围是8~350MHz,其频率制造公差在±10ppm以内,温度频差在-55~+90℃的宽温度范围内为±50ppm,当工作范围分别为0~60℃,-20~+60℃时,可以达到±5ppm,±10ppm内的小公差。微小型石英谐振器体积小,仅为8×8×3.2mm~3和8×6.5×3.2mm~3,重量小于0.4g,且质量稳定可靠,它们是移动通信等电子设备中良好的电子元器件。

 
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