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波模
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  wave mode
     In this paper, the measurement of driven collective electron density fluctuation in the ion cyclotron range of frequencies (ICRF) on Microtor of UCLA using far infrared (FIR) laser scattering are presented and the results are analysed. The experimental results agree with the fast wave mode conversion theory in a two-ion species plasma.
     本文给出了在UCLA的Microtor装置上,用远红外(FIR)激光散射,对离子回旋共振频率范围(ICRF)的外驱动集体电子密度起伏的测量,并对这些结果进行了分析,发现实验结果直接与两种离子等离子体的快波模转换理论相符合。
短句来源
     HYBRID RESONANCE IN A MULTI ̄SPECIES PLASMA:(Ⅰ) WAVE OBSERVATION AND WAVE MODE IDENTIFICATION
     多离子成分空间等离子体中斜传播波的混杂共振:(Ⅱ)实验观测与波模识别
短句来源
     By the overall principles of homogeneous wave,the general principles to determine the factor A i of the wave mode on Gauss optical beam are discussed,and one example of the wave mode of the transverse E wave is determined.
     从Helmholtz方程的解,再满足横场条件,确定电磁波解的一般原理出发,补充讨论了确定波模系数Ai的一般原则,并例举了一种横E波的确定。
短句来源
     If a dedicated line is erected, there is a wave mode of which insertion loss and transmission loss are smaller, which can could be employed for inductive communication.
     架设专用感应线后 ,矿井隧道中将存在一个插入损耗和传输损耗都比较小的波模 ,利用该波模进行感应通信是可行的
短句来源
     The paper had a research on the influence of the conductivity σ in the mine roadway to the transmission of the electric magnetic wave. The results showed that in the mine circular sectional roadway,due to the existing of the conductivity σ,the reduction of the circular roadway wave mode would increase with the increasing of the frequency. But the reduction of the TE_(01)wave mode would reduce with increasing of the frequency.
     研究了电导率σ在煤矿圆形巷道中对电磁波传播的影响,并得出:在圆形巷道中,由于电导率σ的存在,使得圆形巷道波模的衰减随着频率的增加而单调增大,但是TE01波模的衰减却是随频率增加而单调下降,因此,TE01波模更适合在圆形巷道中传播。
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  “波模”译为未确定词的双语例句
     for the bifilar mode, the greater the conductivity is the smaller the attenuation rate is.
     电缆内导体的电导率越大,双线波模衰减率越小;
短句来源
     Wave transformation induced by shear flow in the magnetopause boundary layer
     磁层顶边界层剪切流引起的MHD波模转化
短句来源
     MODE CONVERSION AND PROPAGATION OF FAST WAVE IN TOKAMAK ICRF HEATING
     ICRF快波模转换及快波传播
短句来源
     It is showed that the well known Rayleigh-Tay-lor instability in the intermediate region can be obtained from our model and what is more, the Rayleigh-Taylor instability corresponds to that of negative energy wave.
     而在中小尺度区域,Vin效应很重要,本文模型将得到著名的Rayleigh-Taylor不稳定性结果,Vin项对波的影响可以是致稳作用也可能是失稳作用,RT不稳定性波模对应于负能波分支.
短句来源
     Estimation of the transverse wave strength in gaseous detonation by C-J sound speed
     用C-J声速估算气体爆轰波模波强度的方法
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  相似匹配句对
     Sheet Wave- Shaped Die
     纹板弯曲
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     The flexure wave is a basic wave.
     弯曲是其基本
短句来源
     AN ELECTRIC WAVE-ANALYZER
     谱分析仪
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     reversed T wave;
     T倒置;
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     MODULUS AND CAPACITY
     和容量
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  wave mode
In the case of one excited wave mode the system of model equations goes over into the Kadomtsev-Petviashvili equation, in which, however, the variables x and t are interchanged.
      
The existence of an antisymmetric edge wave mode depends on the Poisson's ratio of the elastic plate.
      
The problem of constructing an asymptotic representation of the solution of the internal gravity wave field excited by a source moving at a velocity close to the maximum group velocity of the individual wave mode is considered.
      
The threshold values of parameters (a dose of preliminary irradiation, comonomer ratio in the initial mixture) necessary for the realization of the self-sustained wave mode of copolymerization have been determined.
      
It was demonstrated that the alternating-current square-wave mode, which can be combined with a triangular potential sweep, possesses the best sensitivity.
      
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This is a brief introduction on the academic activities concerning time and frequency submitted to the National Assembly of the Chinese Astronomical Society, 1982. Tbe development of time service in China during the last three years can be summarized as the following four paris a. Local atomic time systems have been establisbed in two observatories with the ever-improving accuracies. By using the homemade hydrogen maser, the length of a second is kept at the accuracy of 2×10~(-12) or better, and the daily stability...

This is a brief introduction on the academic activities concerning time and frequency submitted to the National Assembly of the Chinese Astronomical Society, 1982. Tbe development of time service in China during the last three years can be summarized as the following four paris a. Local atomic time systems have been establisbed in two observatories with the ever-improving accuracies. By using the homemade hydrogen maser, the length of a second is kept at the accuracy of 2×10~(-12) or better, and the daily stability is better than 3×10~(-13) b. With many satisfactory results, a number of time synchronization experiments were carried out domestically or cooperated with other countries. The time comparison experiment by means of Symphony satellite between China and France, the time synchronization experiments by flyingclocks and TV, as well as by receiving Loran-C signals are some of them. Parkticularly, it achieved very good results that the time delay of ground long waves on the irregular surface has got a better revision via a flying clock. According to the revision, the accuracies of time synchronization can come up to ±0.2μs and ±0.5μs on homogeneous and irregular surface respectively. c. The study and development of many kinds of equipment in the subject of time and frequency have alao got encouraging progress d. The pricision of frequency and time intervals broadcasted by the HF station has been improved and now reaches a high quality, better than 1×10~(-11). The broadcasting of time and frequency with LF(BPL) at fixed time every day has been developed simultaneously and the Pricision is better than 1×10~(-12). All the time differences between BPL and UTC(CSAO) are less than 2μs. Along with the development as stated above we have cooperated with our colleagues in the world. As the participants of CCIR, some academic theses were presented to the symposia during the past three years。 For the purpose of getting academic exchange, a number of foreign experts engaged in this specialality were invited to visit our country. To sum up the time service in China during the last three years, we could say that we have made a large Step. we art looking forward to getting more progress.

本文简要地介绍了中国授时工作三年来的工作情况,文章分四个方面进行了介绍。 1.在几个天文台建立了地方原子时,其精度逐年有所提高,秒长的保持主要是利用国产的氢脉泽,秒长的准确度为2×10~(-12),日稳定度优于3×10~(-13)。 2.时间传递:三年来利用各种手段进行大量的时间传递试验。如利用交响乐卫星进行了中、法比对试验,国内搬运钟试验,国内电视同步比对及Loran-C长波比对等,这些试验均取得良好的结果。尤其是利用长波地波模在复杂地面上的传播时延修正达到较高水平,在平滑地面上同步精度为±0.2μs,复杂地面上为±0.5μs。 3.时频设备的研制:研究制做了一系列时频比对设备,达到较好的水平。 4.长、短波时频发播:提高了短波发播控制精度,建立了BPL长波发播台。每日固定时间发播,发播的控制精度优于1×10~(-12),与UTC之差小于2μs。 5.国际联系:多次参加了CCIR第七组会议并向大会提出多篇文稿,邀请美国USNO搬运钟组来华比对。并多次接待来华访问的时频专家。

A mechanism of solar microwave millisecond spike emission is presented in this paper. Once after a beam of nonthermal electrons is injected downwards into a magnetic arch, it will form a hollow beam distribution, which drives electron-cyclotron maser (ECM) to emit electromagnetic radiation.Assuming the hollow beam to be a Gaussian distribution, we calculated the growth rate of X-mode at the second harmonic. By solving the diffusion equation we obtained the evolution of the distribution of nonthermal electrons,...

A mechanism of solar microwave millisecond spike emission is presented in this paper. Once after a beam of nonthermal electrons is injected downwards into a magnetic arch, it will form a hollow beam distribution, which drives electron-cyclotron maser (ECM) to emit electromagnetic radiation.Assuming the hollow beam to be a Gaussian distribution, we calculated the growth rate of X-mode at the second harmonic. By solving the diffusion equation we obtained the evolution of the distribution of nonthermal electrons, the variation of the growth rate vs. time, the saturation time of ECM, tsat, and the saturation energy density of the waves.Takingwhere ns is the number density of nonthermal electrons, we find out that millisecond spike emission (tsat=0.42ms) with very high brightness temperature (Tb=5×1015K) would be produced at frequency ω=2π×2.84 GHz, in accordance with the observation of the spike event on May 16, 1981.It is also found that the maser emission propagates within a thin surface layer of a cone stretching an angle of about 65° around the magnetic field.As the distribution of nonthermal electrons evolves, the transverse velocity component decreases while the parallel one does not. As a result, when the pitch angle diminishes, the electrons can penetrate through the magnetic mirror points and rush into the transition region to produce hard X-ray bursts.

本文提出由非热电子(60keV)的空心束(hollow beam)分布激发回旋脉降作为太阳微波毫秒级尖峰辐射的产生机制。文中求得了非常波模二次谐波的增长率及其随时间的变化、脉泽的饱和时间、饱和波能密度及脉降辐射的方向特征。 结果得到,当磁场强度B=507G,等离子体数密度n_(?)=4×10~9cm~(-3),电子温度T_e=1.4×10~6K,非热电子数密度与热电子数密度之比(n_s/n_e)≈4×10~(-5),磁场标高时,将在2.84GHz频率上产生高亮温度(T_b≈5×10~(15)K)的毫秒级尖峰辐射。

In this paper, the measurement of driven collective electron density fluctuation in the ion cyclotron range of frequencies (ICRF) on Microtor of UCLA using far infrared (FIR) laser scattering are presented and the results are analysed. The experimental results agree with the fast wave mode conversion theory in a two-ion species plasma. The FIR-laser scattering system used in the experiments is also described. Finally, the future work to study is discussed briefly.

本文给出了在UCLA的Microtor装置上,用远红外(FIR)激光散射,对离子回旋共振频率范围(ICRF)的外驱动集体电子密度起伏的测量,并对这些结果进行了分析,发现实验结果直接与两种离子等离子体的快波模转换理论相符合。此外,也描述了本实验所用激光散射系统,简单地讨论了有待进一步探讨的问题。

 
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