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临界频率     
相关语句
  critical frequency
     Variations of the ionospheric F2 layer critical frequency at Zhongshan Station, Antarctica
     南极中山站电离层F2层临界频率变化特征
短句来源
     Finally, the critical frequency load with the 10% outage rate and 2% block rate is found, furthermore the GSM-AMR system capacity is attained.
     最后采用试探的方法得到满足10%的outage率要求与2%阻塞率要求的临界频率负荷率,进而得到GSM-AMR系统的容量。
短句来源
     On the basis of data from the geomagnetic network and ionospheric observatories in China, the geomagnetic low point displacement, diurnal variation anomalies of geomagnetic field and ionospheric f_0F_2 (critical frequency of F_2 layer) anomaly phenomena before large earthquakes have been summarized.
     利用中国地磁台网与电离层台站资料,总结了大地震前出现的地磁低点位移、地磁日变异常及电离层f_0F_2(F_2层临界频率)异常现象。
短句来源
     The main feature of flutter is that exists a critical status-critical wind velocity and critical frequency.
     颤振的重要特征是存在颤振临界状态,即颤振临界风速和颤振临界频率,当作用风速低于颤振临界风速时,结构物对外界扰动的响应会因为阻尼的作用而衰减;
短句来源
     but the filtering action can be neglected for the seismic wave components that their wavelengths are great than 2λ r(or the frequency components are less than the critical frequency f c).
     对于地震波波长大于 2λr 的地震波分量 (或小于临界频率 fc 的频率成分 ) ,其滤波作用一般可以忽略。
短句来源
更多       
  threshold frequency
     An integer linear programming model is presented for computing the optimal static frequency,which is applied to SYS SEDF algorithm for offline real time energy efficient scheduling. The threshold frequency of different real time tasks is analyzed for run time energy optimization. Furthermore,SYS CCEDF and SYS LAEDF algorithms are presented for online real time energy efficient scheduling.
     通过设计线性整数规划模型提出了实现离线节能调度的SYS-SEDF算法,并分析临界频率及其计算方法,进而提出了应用于在线节能调度的SYS-CCEDF算法和SYS-LAEDF算法。
短句来源
  critical frequencies
     Using the ionosonde data observed at Guangzhou and Hainan, and comparing the critical frequencies with the corresponding IRI values, one can find the following differences: (1) Model values of foF2 are systematically bower than those measured;
     本文利用我国广州、海南电离层垂测站的资料,对临界频率实测值(月中值)与IRI—90模式值比较发现:IRI—90的计算值f0F2普遍低于实测值; f0E及f0F1符合较好,但模式的E层和F1层出现与消失时刻同实际情况存在差异;
短句来源
     This paper gives a detailed analysis of the problem of variable inertiaand the parametric excitation of damped torsional vibration system underthe ratio of about 1 or 2 of two critical frequencies.
     本文详细论述了变惯量有阻尼的扭振系统在两个临界频率比Ω=1和2附近的参数激发问题。
短句来源
     Equations of calculating reliability of 4 types and 7 different kinds of working and critical frequencies interferences were derived, and effectualness of them was verified.
     导出了抗共振可靠性工作频率、临界频率相干的 4种类型分布 ,7种不同组合的可靠度计算表达式 .
短句来源
     Critical Frequencies of E-layer in Mid-latitudes and theCalculations of Electron Density Profiles inthe Lower Ionosphere
     中纬E层临界频率和低电离层的电子密度剖面计算
短句来源
     It is known that there are two critical frequencies for a given fill ratio.
     可见对于某一给定的充液比,存在两个临界频率
短句来源
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  “临界频率”译为未确定词的双语例句
     After analysing the data of TEC and f0F2, measured at Beijing, a statistical relationship between Total Electron Content, sunspot numbber R and ionospheric critical frequence f0F2 is obtained.
     利用北京实测的TEC及f_0F_2资料,求出太阳黑子数R,电离层临界频率f_0F_2和总电子含量的一个统计关系。
短句来源
     The results revealed that when transientLED-VEP (TLED-VEP)was applied,the abnormal rate was 33.33%,for steady state LED-VEP(SLED-VEP),the eritical frequency of photic driving(CFPD)was 88.24%,but for associated detec-tion of the both,it was 96,08%.
     结果:异常阳性率TLED-VEP为33.33%,SLED-VEP检测指标光驱动临界频率(criticalfrequencyofphoticdriving,CFPD)为88.24%,两者联合检测异常阳性率达96.08%。
短句来源
     The variation of GMI effect with AC current frequency is investigated. The experimental results show that the GMI effect of the complex-structure sample Fe_ 17Ni_ 83 has a very low critial frequency of 30 kHz (GMI=9.95%) and charicteristic frequency 300 kHz (GMI=27.19%)and its cutoff frequency is 10 MHz (GMI=10.36%).
     此外 ,还研究了复合丝巨磁阻抗效应与驱动交变电流频率的关系 ,复合丝Fe17Ni83 样品巨磁阻抗效应的临界频率为 30kHz(GMI为 9.95 % ) ,特征频率为 30 0kHz(GMI为 2 7.19% ) ,截止频率为 10MHz (GMI为 10 .36 % ) .
短句来源
     Back Propagation(BP)network is applied to forecast f-oF-2 because it is nonlinear between input and output of network.
     本文利用BP网络非线性输入-输出映射的特点预报电离层F2层临界频率.
短句来源
     In this paper, Es occurrence and f0E over Chongqing (29.5°N, 106.6°E) and Lanzhou (36°N, 103.9°E) are compared and studied. The results show that: (1) Change pattern of Es occurrence over these two stations has certain rules. During the daytime, Es occurrence over Chongqing is higher than that over Lanzhou, but at night the result is just the opposite.
     对重庆(29.5°N, 106.6°E)与兰州(36°N, 103.9°E)f0Es>5MHz的 Es出现率和 E层 临界频率 f0E进行了详细对比研究.结果表明:(1)此两地 Es出现率的变化特征显著.白 天重庆高于兰州;
短句来源
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  critical frequency
It is shown that for a certain relationship between the parameters of the porous medium and the saturating fluid there is a "critical" frequency at which the properties of longitudinal waves of both kinds are identical.
      
An analytical expression for this "critical" frequency is obtained.
      
Analysis of flicker fusion critical frequency by the iteration method
      
The analysis of the propagation conditions allows one to relate the position of this minimum to the critical frequency of the water modes.
      
The frequency dependence of attenuation exhibits a pronounced minimum whose position on the frequency axis is close to the critical frequency of the first "water" mode (about 160 Hz).
      
更多          
  threshold frequency
For the transverse component of the dielectric tensor, the threshold frequency for small k is about 2.2 times greater than that calculated without taking into account rotations.
      
In both cases, one of the branches is characterized by a threshold frequency depending on the dislocation density.
      
The interrelation established between the parameters of the laser radiation and the stream is used to determine the threshold frequency of the laser pulses which determines the transition to quasi-steady-state flow.
      
Chaotic Colpitts circuits with fundamental frequency f* beyond 1GHz are studied by both circuit simulation and experiment using Philips' broadband transistor with threshold frequency of 25GHz.
      
Within the framework of the dipole approximation an expression for the interband absorption coefficient is obtained, and the absorption threshold frequency is determined.
      
更多          
  edge frequency
The lux-ampère characteristics at the band edge frequency have been studied at different applied voltages.
      
Among the tested measures, edge frequency in all shortest paths of a network yielded a particularly high correlation with vulnerability and identified intercluster connections in biological but not in random and scale-free benchmark networks.
      
For cloud recognition, we use a total of five different feature extraction methods, namely autocorrelation, co-occurrence matrices, edge frequency, Law's features and primitive length.
      
Using data from 20 patients, the percent change from preocclusion to postocclusion values for total power, spectral edge frequency, spectral variance, and log spectral variance was examined.
      
Electroencephalogram spectral edge frequency, lower esophageal contractility, and autonomic responsiveness during general anesth
      
更多          
  critical frequencies
On the basis of the experimental data, the vertical distribution of the critical frequencies of the waveguide is obtained, and the validity limits are established for the wave and ray calculation methods.
      
A dispersion equation for wave numbers, an equation for critical frequencies, and expressions for the eigenfunctions of such a waveguide are derived.
      
A dispersion equation for the wave numbers of these waves, an equation for the critical frequencies, and expressions for the eigenfunctions of such a waveguide are derived.
      
Critical frequencies and eigenfunctions of the problem are determined.
      
Results of numerical calculations for the wave numbers, critical frequencies, and modes of vibration are presented.
      
更多          


This is a brief report of the measurements by the method of critical penetration frequency of the maximum intensities of ionization in the ionospheric layers during the partial solar eclipse of June 19, 1936 at Shanghai. The results support the ultra-violet light theory of ionization in the F1 layer. For the E layer these results suggest that a considerable part of the ionization may be due to agents different from ultraviolet light.

本文报告公历一九三六年六月十九日在上海日偏蚀时用临界频率法测量天空电离层游离强度之变化就F_1层所显之结果而论,足为紫外线作用论强有力之一证惟按E层所显之结果则显出该层游离化之主因颇有一部分非紫外线之作用。

The oscillating frequency range of quartz crystal at basic oscillator circuits is analyzed and the critical frequency is introduced.It is shown that the oscillating frequencies of the three basic oscillator circuits Iie between the series resonance and the critical frequencies of the crystal, and generally it cannot be oscillated on. the parallel resonance frequency of the crystal.General formulas of the oscillating frequencies of the three basic oscillator circuits and the required transconductance of the tube...

The oscillating frequency range of quartz crystal at basic oscillator circuits is analyzed and the critical frequency is introduced.It is shown that the oscillating frequencies of the three basic oscillator circuits Iie between the series resonance and the critical frequencies of the crystal, and generally it cannot be oscillated on. the parallel resonance frequency of the crystal.General formulas of the oscillating frequencies of the three basic oscillator circuits and the required transconductance of the tube are given.Finally, the ideal oscillating range is discussed and it is thought that the frequency stability of any types of oscillator increases as the oscillating frequency approaching to the series resonance frequency of the crystal.

本文用解析的方法分析了石英晶体在基本振荡电路中的振荡范围,引入临界频率概念,并证明三种基本振荡电路的振荡频率都在晶体的串联谱振频率与临界频率之间,而在一般情况下,不可能振荡在晶体的并联谐振频率上。文中还给出了三种基本振荡电路的振荡频率的普遍公式。最后讨论了理想的振荡范围,认为不论何种振荡器,其振荡频率愈接近晶体的串联谐振频率,由于电路元件不稳定引起的频率漂移就愈小。

This article puts forward a new mechanism of superconductivity of materials, it introduces a conception of critical frequency with the aid of theoretical analysis of for- ced osillation. It disccusses some principal superconductive phenomenas and leads to a simple formula of getting T_e. Besides, this article puts forward an experiential formula of proper frequency of conducting electrons, which accords with all chemical elements with exception of rare- earth elements, therefore calculates critical temperature...

This article puts forward a new mechanism of superconductivity of materials, it introduces a conception of critical frequency with the aid of theoretical analysis of for- ced osillation. It disccusses some principal superconductive phenomenas and leads to a simple formula of getting T_e. Besides, this article puts forward an experiential formula of proper frequency of conducting electrons, which accords with all chemical elements with exception of rare- earth elements, therefore calculates critical temperature Tc of almost all chemical ele- ments excepting rareearth elements. Excepting Al, Hg Pb and Re, the counting accords better with experimental value.

本文提出了一个新的超导机构,通过强迫振动的理论分析,引入了一个临界频率概念。讨论了一些主要的超导现象;得到了一个简单的求T_c的公式。本文又给出了一个求传导电子固有频率的经验公式。它适用于除镧系、锕系外所有的元素。从而计算了除稀土元素外,周期表中几乎所有元素的临界温度T_c;除Al,Hg,Pb,Re,外都和实验值附和的比较好。

 
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