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81.
GUOJun LUQuan-Ming WANGShui WANGYu-Ming DOUXian-Kang 《中国物理快报》2004,21(7):1306-1309
A 21/2-dimensional electromagnetic particle-in-cell (PIC) simulation code is used to investigate the wave phenomena in the plasma sheet of collisionless magnetic reconnection. The results show that these waves have the following characteristics: they are right-hand circularity polarized, with propagation direction nearly parallel to local magnetic field, and frequency between 0.07 and 0.17 times of local electron cyclotron frequency. Therefore we conclude that such waves are Whistler waves, and their possible excitation mechanisms are also discussed. 相似文献
82.
Observation of Electromagnetically Induced Transparency by a Train of Short Pulses 总被引:1,自引:0,他引:1 下载免费PDF全文
We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (^85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman-Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of ^85Rb. 相似文献
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在电磁学中经常可以看到这样一个例子,两个稳恒电流元I1dl1和I2dl2之间的作用力并不符合牛顿第三定律。对该问题的解释往往是:稳恒电流元不可能单独存在,稳恒电流总是形成闭合回路,可以证明两个载有稳恒电流的闭合回路之间的相互作用是符合作用反作用定律的。那么电流随时间变化的两个闭合回路之间的相互作用是否符合作用反作用定律? 相似文献
86.
研究Ti-50.8at%Ni合金在马氏体-奥氏体相变温度附近的电磁性质.由M-H曲线分析了传导电子的顺磁性以及少量局域电子引起的铁磁性.在M-T曲线中,降温曲线在180K附近有突降,升温曲线在230K附近有突升.在电阻率测量中,降温和升温的ρ-T曲线也有类似的突变.升温过程的质量热容cp曲线在230K附近出现了由奥氏体相变引起的跳跃.这些实验结果表明,样品的马氏体相变温度约
关键词:
TiNi合金
电磁性质
马氏体-奥氏体相变
质量热容 相似文献
87.
Local Modulation of Double Electromagnetically Induced Transparency Spectrum 总被引:1,自引:0,他引:1 下载免费PDF全文
The double electromagnetically induced transparency induced by two coupling fields can be realized in a fourlevel tripod-type atom. Such double transparency spectra can be locally modulated by using the weak coherent fields to perturb the coupling transitions. These investigations within this scheme can be independent of Doppler broadening by properly orienting these fieds. 相似文献
88.
Electrodynamic Analysis of Dissipative Electromagnetic Materials Based on Fractional Derivative 下载免费PDF全文
The generalized Lagrangian is defined in a dissipative electromagnetic medium on the basis of the combination of dynamical analysis and fractional derivative. Lorentz medium models are obtained by formulating relevant Euler-Lagrange equations. The invariance is obtained subsequently by investigating the invariance of time variation in the system, and then the relation between the related Hamiltonian and electromagnetic energy density is investigated. Canonical equations are obtained eventually. The electrodynamic interpretation on dissipative electromagnetic systems is revealed. 相似文献
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Experimental Verification of Left-Handed Metamaterials Composed of Coplanar Electric and Magnetic Resonators 下载免费PDF全文
We verified experimentally left-handed metamaterials (LHM) composed of coplanar electric and magnetic resonators. A typical LHM sample composed of coplanar resonator unit cells was fabricated, investigated and tested. The experimental results show that the tested sample has a left-handed band of width 1.4 GHz in the X band. The experimental results agree quite well with the simulation ones. Moreover, both the simulation and experimental results show that the LHM under study can automatically achieve good impedance-matching in the left-handed band. 相似文献