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61.
Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7−δ single crystals
R.V. Vovk N.R. Vovk G.Ya Khadzhai O.V. Dobrovolskiy Z.F. Nazyrov 《Current Applied Physics》2014,14(12):1779-1782
The effect of high hydrostatic pressure up to 17 kbar on the fluctuation conductivity of lightly Pr-doped Y1−xPrxBa2Cu3O7−δ (x ≈ 0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7−δ samples, application of a high pressure leads to a substantial increase of the pressure derivative of the coherence length dξc/dP and a temperature shift of the 2D-3D crossover point. Possible mechanisms of the influence of high pressure on the critical temperature and the coherence length are discussed within the framework of a model assuming the presence of singularities in the charge carriers electron spectrum typical for lattices with strong coupling. 相似文献
62.
63.
Xiangmin Liu Pengfei Zhu Zonglin Yan Jiangwen Wu Qingfen Yang 《Optics Communications》2008,281(2):273-277
The accurate reflection coefficient of prism waveguide coupler that takes coherence property of incident light into account is obtained at first. Based on the reflection coefficient, the effect of coherence property of incident light on prism coupling is discussed in this work. It is shown that extra damping in waveguide caused by the coherence property is larger for high-order resonant mode than that for low-order mode. For 100 fs Gaussian pulses incidence, the reflected spectra at different resonant modes are obtained theoretically and experimentally, which show that coherence property has a strong effect on prism coupling at high-order modes. 相似文献
64.
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66.
An expression is derived for the cross-spectral density matrix, valid in the paraxial region of the far field, generated by a planar blackbody source. With the help of it we determine the spectral degrees of polarization and of cross-polarization of the far field. 相似文献
67.
Philippe Artzner Freddy Delbaen Jean-Marc Eber David Heath Hyejin Ku 《Annals of Operations Research》2007,152(1):5-22
Starting with a time-0 coherent risk measure defined for “value processes”, we also define risk measurement processes. Two
other constructions of measurement processes are given in terms of sets of test probabilities. These latter constructions
are identical and are related to the former construction when the sets fulfill a stability condition also met in multiperiod
treatment of ambiguity as in decision-making. We finally deduce risk measurements for the final value of locked-in positions
and repeat a warning concerning Tail-Value-at-Risk. 相似文献
68.
《Journal of Pure and Applied Algebra》2022,226(10):107037
A coherent presentation of an n-category is a presentation by generators, relations and relations among relations. Confluent and terminating rewriting systems generate coherent presentations, whose relations among relations are defined by confluence diagrams of critical branchings. This article introduces a procedure to compute coherent presentations when the rewrite relations are defined modulo a set of axioms. Our coherence results are formulated using the structure of n-categories enriched in double groupoids, whose horizontal cells represent rewriting paths, vertical cells represent the congruence generated by the axioms and square cells represent coherence cells induced by diagrams of confluence modulo. We illustrate our constructions on rewriting systems modulo commutation relations in commutative monoids, isotopy relations in pivotal monoidal categories, and inverse relations in groups. 相似文献
69.
A review of X-ray intensity fluctuation spectroscopy 总被引:1,自引:0,他引:1
This article reviews the literature on X-ray fluctuation intensity spectroscopy or, as it is often called, X-ray photon correlation spectroscopy. It highlights measurements using different types of diffuse scattering. To cite this article: M. Sutton, C. R. Physique 9 (2008). 相似文献
70.
J. W. Eslick Jr H. N. Pham C. Radu A. Puri 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(3):553-562
In this paper, we revisit the problem of quantum entanglement in an
oscillating macroscopic mirror previously studied by Marshall et al. consisting
of a modified Michelson interferometer where one of the mirrors is free to
oscillate about its center of mass. A photon incident upon the oscillating
mirror becomes entangled with the mirror, driving the mirror into a
superposition of quantum states. Once the photon and mirror decouple, the
mirror returns to its initial state. The purpose of our investigations was
to optimize the parameter regime, taking into consideration the current
state of technology and the demands imposed by the need to maintain a stable
environment in the presence of thermal noise. Optimization should not demand
ultra-low temperatures and this is reflected in our results. Our results also
show that if the separation between states is maintained at 10-14 m, the mirror size is reduced, making it easier to induce superposition in
the mirror. The critical nature of mirror reflectivity and its connection to
cavity decay rate was also revealed by our investigations. The results
obtained through our investigations could be useful in quantum error
correction, where decoherence negatively affects the results of computations
performed by quantum computers. Finally, we note that we are only concerned
with an isolated system, where no losses to the external environment occur
and any decoherence that occurs within the system remains internal to the
system; that is, any mention of decoherence refers specifically to
recoverable decoherence. 相似文献