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We discuss the zero field superconducting phase transition in a finite system of magnetically coupled superconducting layers. Transverse screening is modified by the presence of other layers resulting in topological excitations with fractional flux. Vortex stacks trapping a full flux and present at any finite temperature undergo a dissociation transition which corresponds to the depairing of fractional-flux vortices in individual layers. We propose an experiment with a bilayer system allowing us to identify the dissociation of bound vortex molecules. 相似文献
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Background
Growth hormone (GH) plays an incompletely understood role in the development of the central nervous system (CNS). In this study, we use transgenic mice expressing a growth hormone antagonist (GHA) to explore the role of GH in regulating postnatal brain, spinal cord and body growth into adulthood. The GHA transgene encodes a protein that inhibits the binding of GH to its receptor, specifically antagonizing the trophic effects of endogenous GH. 相似文献3.
The Deser, Gilbert, Sudarshan representation (D.G.S.R.) for the functions Wi(ν, q2) (i = 1,2) is considered as equations determining spectral functions hi(a, α) via the values Wi(ν, q2) in the physical region of the electroproduction channel. It is shown that if Wi(ν, q2) obey the microcausality and spectrality conditions, then the equations for hi(a, α) have solutions in the class of Schwartz temperated distributions and thereby the D.G.S.R. is proved. Formulae are obtained expressing spectral functions in the D.G.S.R. through the values of functions Wi(ν, q2) in the physical region of the electroproduction channel. 相似文献
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B. V. Geshkenbein 《Zeitschrift fur Physik C Particles and Fields》1989,45(2):351-354
We analyse the experiments [1–3] on the measurement of the pion electromagnetic formfactor in the time-like and space-like region using an expression with correct analytical properties and with the asymptotics predicted by QCD. The best fit values for the physical quantities (1) electromagnetic radius of the pion:r π 2 =0.466±0.002 fm2, (2) the mass and width of the ρ (770) and the ρ′ (1600) meson:m ρ=768±1 MeV,Г ρ=138±1 MeV,m ρ′=1546±26 MeV,Г ρ'=620±60 MeV; (3) the residuesg ρ m ρ 2 =0.676±0.003,g ρ′ m ρ′ 2 =?(0.644±0.009); (4) the ππ-scattering lengtha 1 1 =(0.1±0.01)m π ?3 . 相似文献
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