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1.
We investigate the symmetry reduction for the two-dimensional incompressible Navier Stokes equation in conventional stream function form through Lie symmetry method and construct some similarity reduction solutions. Two special cases in [D.K. Ludlow, P.A. Clarkson, and A.P. Bassom, Stud. Appl. Math. 103 (1999) 183] and a theorem in [S.Y. Lou, M. Jia, X.Y. Tang, and F. Huang, Phys. Rev. E 75 (2007) 056318] are retrieved. 相似文献
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简单介绍了元素的核合成理论发展的历史和现况.The development history of the nucleosynthesis theory of elements, which was presented by E. M. Burbidge. G. R. Burbidge, W. A. Fowler, F. Hoyle and A. G. W.Cameron, and the progress of this theory during the past 40 years are introduced. 相似文献
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《声学学报:英文版》2010,(4):428-431
43.05. History; 43.10. General; 43.15. Standards; 43.20. General linear acoustics; 43.25. Nonlinear acoustics; 43.28. Aeroacoustics and atmospheric sound; 43.30. Underwater sound; 43.35. Ultrasonics, quantum acoustics, and physical effects of sound; 43.38. Transduction, 相似文献
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Ho and Ti co-doped BiFe03 multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity 下载免费PDF全文
Bio.9HOo.lFeo.9503 and Bio.9HOo.lFeo.9Tio.0503 ceramics were prepared and compared to reveal the effects of Ho and Ti codoping in BiFeO3. X-ray diffraction indicated that both ceramics had a high rhombohedral perovskite phase content, and microstructural analyses showed that the grains of the Bio.9HOo.lFeo.9Tio.0503 ceramics were much smaller than those of Bio.9HOo.lFeo.9503. An electrical resistivity of more than 1 × 1014.cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2Mr of 0.485 emu/g were obtained for Bi0.9HO0.1Fe0.9Ti0.0503; both were much higher than those of Bio.9Hoo.1Feo.9503. Changes in the defect subsystem of BiFeO3 induced by Fe-deficiency and (Ho,Ti) codoping are proposed as being responsible for the improvement in the properties. 相似文献
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Reply to Comment on "Mechanism for Alternating Electric Fields Induced-Effects on Cytosolic Calcium" 下载免费PDF全文
Our article (Chin. Phys. Lett. 26 (2009) 017102) was attempting to calculate the possible existence of the window effects on the physiological signal changes by the external electric field. It is attempted mainly to combine the vibrated-ion model of Panagopoulos et al.(Refs. in our article) and the cellular model of Kuster et al. (Ref. in our article) and Tortes et al. (Ref. in our article). We did not attempt to take the initiative of theoretical bases of both the groups. 相似文献
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Cross sections for charge transfer and ionization of atomic hydrogen by highly charged ions A^q+ (q =6 9) are evaluated using a simple and classical method based on the previous works by Bohr and Lindhard [K. Dan. Vidensk. Selsk. Mat. Fys. Medd 28 (1954) No 7], Brandt [Nucl. Instrum. Methods Phys. Res. 214 (1983) 93] and Ben-Itzhak et al. [J. Phys. B: At. Mol. Opt. Phys. 26 (1993) 1711]. It is proved that the present calculations are feasible to some extent in comparison with available experimental data and quantum calculations. 相似文献
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We propose a novel deterministic protocol that two senders are capable of remotely preparing arbitrary two-and three-qubit states for a remote receiver using EPR pairs and GHZ state as the quantum channel.Compared with the existing deterministic protocols [An et al.2011 Phys.Lett.A 375 3570 and Chen et al.2012 J.Phys.A:Math.Theor.45 055303],the quantum resources and classical information in our scheme are decreased,and the whole operation process is simplified. 相似文献
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In a recent letter [H.F. Wang, X. Ji, and S. Zhang, Phys. Lett. A 358 (2006) 11], an improvement of the multiparty quantum secret splitting and quantum state sharing protocol [F.G. Deng, et al., Phys. Lett. A 354 (2006) 190.] was presented. We study the security of the improved protocol and find that two or more dishonest participants may recover the secret from the dealer. Hence we further modify the improved protocol, which make it stand against this kind of attack. 相似文献
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In a recent paper[J. Korean. Phys. Soc. 49 (2006) 459], two GHZ-state-based quantum secure direct communication protocols were presented. Here we point out that an eavesdropper can utilize a special property of GHZ states, i.e. "correlation-elicitable" to obtain half information of the transmitted secrets without being detected in both protocols. The particular attack strategy is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocols secure against this kind of attack. 相似文献
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SUN Hong-Zhang TANG Zheng-Xin 《理论物理通讯》2008,50(8):425-428
A stochastic local limited one-dimensional rice-pile model is numerically investigated. The distributions for avalanche sizes have a clear power-law behavior and it displays a simple finite size scaling. We obtain the avalanche exponents Ts= 1.54±0.10,βs = 2.17±0.10 and TT = 1.80±0.10, βT =1.46 ± 0.10. This self-organized critical model belongs to the same universality class with the Oslo rice-pile model studied by K. Christensen et al. [Phys. Rev. Lett. 77 (1996) 107], a rice-pile model studied by L.A.N. Amaral et al. [Phys. Rev. E 54 (1996) 4512], and a simple deterministic self-organized critical model studied by M.S. Vieira [Phys. Rev. E 61 (2000) 6056]. 相似文献
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This paper presents a method for generating entanglement molecules,
which is introduced by Dur (2001 Phys. Rev. A). In this
scheme, N ladder-type three-level atoms are sent through a
resonant weak coherent cavity field, then the system states are
measured. And the system field may collapse onto some possible types
of entanglement molecules. Meanwhile it discusses about the
interaction time from the experimental point of view, and compare
the result with the previous scheme proposed by Huang (2004 J.
Phys. B: At. Mol. Opt. Phys.). 相似文献
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Spin pumping at the Co2FeAlo.sSio.5/Pt and Pt/Co2FeAIo.sSio.5 interfaces has been studied by ferromagnetic res- onance technology (FMR). The spin mixing conductance of the Co, FeA~o.sSio.s/Pt and Pt/Co2FeAlo.sSio.5 interfaces was determined to be 3.7~ lO19 m-2 and 2.1 ~ lO19 m 2 by comparing the Gilbert damping in a Co2FeAIo.sSio.5 sin- gle film, Co2FeAlo.sSio.s/Pt bilayer film and a Pt/Co2FeAIo.sSio.s/Pt trilayer film. Spin pumping is more efficient in the Co2FeAlosSios/Pt bilayer film than in permalloy/Pt bilayer film. 相似文献
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In this contribution,the α preformation factors of 606 nuclei are extracted within the framework of the generalized liquid drop model(GLDM).Through the systematic analysis of the α preformation factors of even-even Po-U isotopes,we found that there is a significant weakening of influence of N=126 shell closure in uranium,which is consistent with the results of a recent experiment [J.Khuyagbaatar et al.,Phys.Rev.Lett.115,242502(2015)],implying that N=126 may not be the magic number for U isotopes.Furthermore,we propose an improved formula with only 7 parameters to calculate α preformation factors suitable for all types of α-decay;it has fewer parameters than the original formula proposed by Zhang et al.[H.F.Zhang et al.,Phys.Rev.C 80,057301(2009)]with higher precision.The standard deviation of the α preformation factors calculated by our formula with extracted values for all 606 nuclei is 0.365 with a factor of 2.3,indicating that our improved formula can accurately reproduce the α preformation factors.Encouraged by this,the α-decay half-lives of actinide elements are predicted,which could be useful in future experiments.Notably,the predicted α-decay half-lives of two new isotopes 220 Np [Z.Y.Zhang,et al.,Phys.Rev.Lett.122,192503(2019)] and 219 Np [H.B.Yang et al.,Phys.Lett.B 777,212(2018)] are in good agreement with the experimental α-decay half-lives. 相似文献
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The nonclassical symmetries of a class of nonlinear partial differential equations obtained by the compatibility method is investigated. We show the nonclassicaJ symmetries obtained in [J. Math. Anal. Appl. 289 (2004) 55, J. Math. Anal. Appl. 311 (2005) 479] are not all the nonclassical symmetries. Based on a new assume on the form of invariant surface condition, all the nonclassical symmetries for a class of nonlinear partial differential equations can be obtained through the compatibility method. The nonlinear Klein-Gordon equation and the Cahn-Hilliard equations all serve as examples showing the compatibility method leads quickly and easily to the determining equations for their all nonclassical symmetries for two equations. 相似文献
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Classical Communication and Entanglement Cost in Preparing a Class of Multi-qubit States 总被引:1,自引:0,他引:1
PAN Gui-Xia LIU Yi-Min ZHANG Zhan-Jun 《理论物理通讯》2008,49(3):631-634
Recently, several similar protocols [J. Opt. B 4 (2002) 380; Phys. Lett. A 316 (2003) 159; Phys. Lett. A 355 (2006) 285; Phys. Lett. A 336 (2005) 317] for remotely preparing a class of multi-qubit states (i.e, α[0...0〉 +β[1... 1〉) were proposed, respectively. In this paper, by applying the controlled-not (CNOT) gate, a new simple protocol is proposed for remotely preparing such class of states. Compared to the previous protocols, both classical communication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded. Hence our protocol is more economical and feasible. 相似文献