共查询到20条相似文献,搜索用时 31 毫秒
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A. Wobst D. Weinmann 《The European Physical Journal B - Condensed Matter and Complex Systems》1999,10(1):159-167
The curvatures of two-particle energy levels with respect to the enclosed magnetic flux in mesoscopic disordered rings are
investigated numerically. We find that the typical value of the curvatures is increased by interactions in the localised regime
and decreased in the metallic regime. This confirms a prediction by Akkermans and Pichard (Eur. Phys. J. B 1, 223 (1998)). The interaction-induced changes of the typical curvatures at different energies and disorder strengths exhibit
one-parameter scaling with a conductance-like single parameter. This suggests that interactions could influence the conductance
of mesoscopic systems similarly.
Received 24 August 1998 相似文献
4.
Certain important and pertinent questions have been raised by E. Träbert in his comment on the paper [Eur. Phys. J. D 22, 189 (2003)] by one of us. We provide explanations as well as new and recent data using a calibrated monochromator on the existence of the main intercombination multiplet 233 nm which is the bone of contention. It is shown that there is no conflict with the established atomic physics in the regenerative sooting discharges; only the interpretations are at variance with those of the comment.Received: 30 July 2003, Published online: 30 September 2003PACS:
32.70.Fw Absolute and relative intensities - 34.50.Dy Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of ions - 34.80.Dp Atomic excitation and ionization by electron impact 相似文献
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This paper is a further work of the authors' paper published previously (Liao T H and Gao Q 2005 Chin. Phys. Lett. 22 2316). The amplitudes of fractional Fourier transform of Cantor sets are analysed from the viewpoint of multifractal by wavelet transform maxima method (WTMM). An integral operation is carried out before the application of WTMM, such that the function obtained can be considered as the perturbed devil staircase. Also, wavelets with large number of vanishing moments are used, which makes the complete singularity spectrum more accessible. The validity of multifractal formalism is guaranteed by restricting parameter q to a proper range, so that the phenomenon of multifractal phase transition can be explained reasonably. Particularly, the method of determining the range of parameter q in the above paper is developed to be more operational and rigorous. 相似文献
6.
E. Scalas U. Garibaldi S. Donadio 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,60(2):271-272
This erratum corrects a mistake in reference [E. Scalas, U. Garibaldi, S. Donadio, Eur. Phys. J. B 53, 267 (2006)].
In that paper,
we needed an aperiodic version of the BDY game, but, in formula (1),
we incorrectly presented
a periodic transition matrix of period 2 in the special case of g = 2 agents.
Here, we present the right aperiodic version. 相似文献
7.
J.W. Brill 《Solid State Communications》2004,130(7):437-439
In recent measurements on the charge-density-wave (CDW) conductor blue bronze (K0.3MoO3), the electro-transmittance and electro-reflectance spectra were searched for intragap states that could be associated with solitons created by injection of electrons into the CDW at the current contacts [Eur. Phys. J. B16 (2000), 295; Eur. Phys. J. B35 (2003) 233]. In this work, we adapt the model of soliton absorption in dimerized polyacetylene to the blue bronze results, to obtain the (order of magnitude) estimate that current induced solitons occur on less than ∼10% of the conducting chains. We discuss the implications of these results on models of soliton lifetimes and motion of CDW phase dislocations. 相似文献
8.
E.P. Borges 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,30(4):593-595
Comment on Eur. Phys. J. B 27, 445 (2002)
We analyze the distribution of success of musicians, comparing a stretched exponential (found by J.A. Davies [Eur. Phys.
J. B 27, 445 (2002)]) with a distribution of the family of the q-exponential (presenting an intermediate power-law regime with a crossover to an exponential tail). We find that both assumptions
yield comparable results, within the available range of data, hence a definite conclusion cannot yet be taken. But this example
joins many others that has been found to be fairly described by q-exponentials (or variations of it), which may be indicative that there is a (significantly large) class of systems described
by nonextensive statistical mechanics, from where q-exponentials naturally appear.
Received 17 October 2002 Published online 31 December 2002 相似文献
9.
G. Huber T.A. Vilgis 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,3(2):217-223
The adsorption of a single ideal polymer chain on energetically heterogeneous and rough surfaces is investigated using a variational
procedure introduced by Garel and Orland (Phys. Rev. B 55, 226 (1997)). The mean polymer size is calculated perpendicular and parallel to the surface and is compared to the Gaussian
conformation and to the results for polymers at flat and energetically homogeneous surfaces. The disorder-induced enhancement
of adsorption is confirmed and is shown to be much more significant for a heterogeneous interaction strength than for spatial
roughness. This difference also applies to the localization transition, where the polymer size becomes independent of the
chain length. The localization criterion can be quantified, depending on an effective interaction strength and the length
of the polymer chain.
Received: 29 October 1997 / Revised: 19 December 1997 / Accepted: 6 March 1998 相似文献
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A. Casado T. Marshall R. Risco-Delgado E. Santos 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,13(1):109-119
We continue the study of parametric down conversion within the framework of the Wigner representation, by using a Maxwellian
approach developed in a recent paper [A. Casado et al., Eur. Phys. J. D 11, 465 (2000)]. This gives a mechanism, inside the crystal, for the production of the down-converted radiation. We obtain the
electric field to second order in the coupling constant by using the Green's function method, and compare our treatment with
the standard Hamiltonian approach. The spectrum of the down-converted radiation is calculated as a function of the parameters
of the nonlinear crystal (in particular the length) and the radius of the pumping beam.
Received 15 May 2000 相似文献
11.
We show that the emergence of criticality in the locally-defined Bak-Sneppen model corresponds to separation over a hierarchy
of timescales. Near to the critical point the model obeys scaling relations, with exponents which we derive numerically for
a one-dimensional system. We further describe how the model can be related to the glass model of Bouchaud (J. Phys. I France
2, 1705 (1992)), and we use this insight to comment on the usual assumption of stationarity in the Bak-Sneppen model. Finally,
we propose a general definition of self-organised criticality which is in partial agreement with other recent definitions.
Received 14 January 2000 and Received in final form 18 April 2000 相似文献
12.
A.E. Robson 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,22(1):117-118
Eur. Phys. J. D 15, 87 (2001)
Received 12 January 2001 Published online 10 December 2002
RID="a"
ID="a"e-mail: aerobson@cstone.net 相似文献
13.
V. A. Bernshtam Yu. Ralchenko Y. Maron 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,51(3):319-320
We show that the criticism [Eur. Phys. J. D 49, 167 (2008)] of our
empirical formula for electron-impact ionization of atomic ions [J. Phys B. 33, 5025 (2000)] is unjustified. 相似文献
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B. Eckhardt S. Grossmann D. Lohse 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(3):541-544
We interpret measurements of the Reynolds number dependence of the torque in Taylor-Couette flow by Lewis and Swinney [Phys.
Rev. E 59, 5457 (1999)] and of the pressure drop in pipe flow by Smits and Zagarola [Phys. Fluids 10, 1045 (1998)] within the scaling theory of Grossmann and Lohse [J. Fluid Mech. 407, 27 (2000)], developed in the context of thermal convection. The main idea is to split the energy dissipation into contributions
from a boundary layer and the turbulent bulk. This ansatz can account for the observed scaling in both cases if it is assumed
that the internal wind velocity introduced through the rotational or pressure forcing is related to the external (imposed) velocity U, by with and for the Taylor-Couette (U inner cylinder velocity) and pipe flow (U mean flow velocity) case, respectively. In contrast to the Rayleigh-Bénard case the scaling exponents cannot (yet) be derived
from the dynamical equations.
Received 9 September 2000 相似文献
15.
I. Kim G. Mahler 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,60(3):401-408
In the classical limit no work is needed to couple a
system to a bath with sufficiently weak coupling strength (or
with arbitrarily finite coupling strength for a linear system) at
the same temperature. In the quantum domain this may be expected to
change due to system-bath entanglement. Here we show analytically
that the work needed to couple a single linear oscillator with
finite strength to a bath cannot be less than the work obtainable
from the oscillator when it decouples from the bath. Therefore, the
quantum second law holds for an arbitrary temperature. This is a
generalization of the previous results for zero temperature
[Ford and O'Connell, Phys. Rev. Lett. 96, 020402 (2006); Kim and Mahler, Eur. Phys. J. B 54, 405 (2006)]; in the high temperature limit we recover the
classical behavior. 相似文献
16.
S. -W. Xu Y. -X. Xie Z. -K. Li F. -R. Xu H. -L. Liu Y. -B. Xing B. Guo J. -P. Xing C. -F. Wang 《The European Physical Journal A - Hadrons and Nuclei》2006,29(2):161-164
The proton-rich isotope 133Sm was produced via the fusion evaporation reaction 40Ca + 96Ru. Its β-delayed proton decay was studied by p-γ coincidence in combination with a He-jet tape transport system, and half-lives,
proton energy spectra, γ-transitions following the proton emission, as well as β-delayed proton branching ratios to the low-lying
states in the grand-daughter nucleus were determined. Comparing the observed β-delayed proton branching ratios with statistical
model calculations, the best agreement is found assuming that only one level with the spin of 3/2 in 133Sm decays or two levels with the spins of 1/2 and 5/2 decay with similar half-lives. The configuration-constrained nuclear
potential energy surfaces of 133Sm were calculated using the Woods-Saxon-Strutinsky method, which suggests a 1/2- ground state and a 5/2+ isomer with an excitation energy of 120keV. Therefore, the simple (EC+β+) decay scheme of 133Sm in Eur. Phys. J. A 11, 277 (2001) has been revised. In addition, our previous experimental data on the β-delayed proton decay of 149Yb reported in Eur. Phys. J. A 12, 1 (2001) was also analyzed using the same method. The spin-parity of 149Yb is suggested to be 1/2-. 相似文献
17.
Are citations of scientific papers a case of nonextensivity? 总被引:1,自引:0,他引:1
C. Tsallis M.P. de Albuquerque 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,13(4):777-780
The distribution N(x) of citations of scientific papers has recently been illustrated (on ISI and PRE data sets) and analyzed by Redner (Eur.
Phys. J. B 4, 131 (1998)). To fit the data, a stretched exponential () has been used with only partial success. The success is not complete because the data exhibit, for large citation count
x, a power law (roughly for the ISI data), which, clearly, the stretched exponential does not reproduce. This fact is then attributed to a possibly
different nature of rarely cited and largely cited papers. We show here that, within a nonextensive thermostatistical formalism,
the same data can be quite satisfactorily fitted with a single curve (namely, [0pt] for the available values of x. This is consistent with the connection recently established by Denisov (Phys. Lett. A 235, 447 (1997)) between this nonextensive formalism and the Zipf-Mandelbrot law. What the present analysis ultimately suggests
is that, in contrast to Redner's conclusion, the phenomenon might essentially be one and the same along the entire range of the citation number x.
Received 13 April 1999 相似文献
18.
G. Brida M. Genovese F. Piacentini 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,44(3):577-580
Following the theoretical suggestion of [E. Santos, Phys. Lett. A 327, 33 (2004);
E. Santos, Eur. Phys. J. D 42, 501 (2007)], we present experimental results addressed to
test restricted families of local realistic models, but without
relying on the fair sampling assumption. 相似文献
19.
M. P. Seevinck J.-Å. Larsson 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(1):51-53
De Raedt et al. [Eur. Phys. J. B 53, 139 (2006)] have claimed to provide a
local realist model for correlations of the singlet state in the
familiar Einstein-Podolsky-Rosen-Bohm (EPRB) experiment when
time-coincidence is used to decide which detection events should
count in the analysis, and furthermore that this suggests that it is
possible to construct local realistic models that can reproduce the
quantum mechanical expectation values. In this letter we show that
these conclusions cannot be upheld since their model exploits the
so-called coincidence-time loophole. When this is properly taken into account no startling conclusions can be drawn about
local realist modelling of quantum
mechanics. 相似文献