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301.
E. J.?Calegari S. G.?Magalh?esEmail author A. A.?Gomes 《The European Physical Journal B - Condensed Matter and Complex Systems》2005,45(4):485-496
The Roth’s two-pole approximation has been used by the present authors
to investigate the role of d-p hybridization in the superconducting
properties of an extended d-p Hubbard model. Superconductivity with
singlet
-wave pairing is treated by following Beenen and Edwards formalism.
In this work, the Coulomb interaction, the temperature and the
superconductivity have been considered in the calculation of some relevant
correlation functions present in the Roth’s band shift.
The behavior of the order parameter associated with temperature, hybridization,
Coulomb interaction and the Roth’s band shift effects on superconductivity are
studied. 相似文献
302.
V.?P.?Gon?alves M.?V.?T.?MachadoEmail author 《The European Physical Journal C - Particles and Fields》2005,40(4):519-529
The photonuclear production of vector mesons in ultraperipheral heavy-ion collisions is investigated within the QCD color dipole picture, with particular emphasis on the saturation model. The integrated cross section and the rapidity distribution for the
(
) process are computed and theoretical estimates for scattering on both light and heavy nuclei are given for the energies of RHIC and LHC. A comparison with the recent STAR data on coherent production of
mesons is also presented. Furthermore, we calculate the photoproduction of vector mesons in proton-proton collisions at RHIC, Tevatron and LHC energies.Received: 12 January 2005, Revised: 2 February 2005, Published online: 9 March 2005 相似文献
303.
304.
A.?G.?DiasEmail author R.?Martinez V.?Pleitez 《The European Physical Journal C - Particles and Fields》2005,39(1):101-107
Some 3-3-1 models predict the existence of a non-perturbative regime at the TeV scale. We study in these models and their supersymmetric extensions, the energy at which the non-perturbative limit and a Landau-like pole arise. An order of magnitude for the mass of the extra neutral vector boson,
, present in these models is also obtained.Received: 12 October 2004, Revised: 1 November 2004, Published online: 21 December 2004PACS:
12.60.Cn, 12.60.Jv 相似文献
305.
F. O.?BorgesEmail author F.?Bredice G. H.?Cavalcanti M.?Gallardo M.?Raineri J. G.?Reyna Almandos A. G.?Trigueiros 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,36(1):23-27
The current status of the determination of corrections to the hyperfine
splitting of the ground state in hydrogen is considered. Improved calculations
are provided taking into account the most recent value for
the proton charge radius. Comparing experimental data with predictions for
the hyperfine splitting, the Zemach radius of the proton is deduced to be
1.045(16) fm.
Employing exponential parametrizations for the electromagnetic form
factors we determine the magnetic radius of the proton to be
0.778(29) fm.
Both values are compared with the corresponding ones derived from the data
obtained in electron-proton scattering experiments and the data extracted
from a rescaled difference between the hyperfine splittings in hydrogen and
muonium. 相似文献
306.
307.
Development and validation of a selective and robust LC-MS/MS method for quantifying amlodipine in human plasma 总被引:1,自引:0,他引:1
Massaroti P Moraes LA Marchioretto MA Cassiano NM Bernasconi G Calafatti SA Barros FA Meurer EC Pedrazzoli J 《Analytical and bioanalytical chemistry》2005,382(4):1049-1054
A liquid chromatographic–tandem mass spectrometric method (LC-MS/MS) for quantifying amlodipine in human plasma was developed and validated. Sample preparation was based on liquid–liquid extraction using NaOH and a mixture of ethyl acetate/hexane (80/20; v/v). Chromatography was performed on a C-18 analytical column and the retention times were 1.9 and 3.0 min for amlodipine and nimodipine (internal standard), respectively. The ionization was optimized using ESI(+) and enhanced selectivity was achieved using tandem mass spectrometric analysis via two MRM functions, 409238 and 418343 for amlodipine and nimodipine. The calibration curve ranged from 0.2 to 20.0 ng/mL. The inter-day precision and accuracy and the relative standard deviation (RSD) were <15%. The analyte was shown to be stable over the timescale of the whole procedure. The robustness of the method was demonstrated by the good reproducibility of the results obtained during the analysis of clinical samples. 相似文献
308.
309.
L.T.?Thieghi J.J.?Bonvent E.A.?Oliveira Email author J.A.?Giacometti D.T.?Balogh 《Applied Physics A: Materials Science & Processing》2003,77(7):911-914
We investigated the alignment induced on a nematic liquid crystal (LC) by a photo-aligned polymer film with azo-dye side groups. The orientation of the LC molecules can be manipulated in a reversible manner by irradiating the film with polarized light. We analyzed the competition between the orientation induced by the main chain, through rubbing of the film and that induced by the photo-aligned polymer. Anchoring strength for the different processing conditions are reported. The changes in film morphology caused by rubbing or photo-alignment could be captured by atomic force microscopy. The reversibility of the photo-induced alignment and the competition between the two anchoring mechanisms may allow recording and erasing of information in a LC display. PACS 61.30.-v; 61.30.Gd 相似文献
310.