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911.
Yu. M. Poluéktov 《Russian Physics Journal》2009,52(1):33-45
A modified perturbation theory is formulated for an asymmetric anharmonic oscillator based on a choice of the main approximation
constructed by analogy with the self-consistent field model. This perturbation theory has a much wider range of application
in comparison with the standard approach and considers a finite number of energy levels in the potential well already in the
main approximation. This approach is used for the construction of a two-atomic model of a quantum crystal. A quantum analog
of the Lindeman criterion is obtained.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 30–40, January, 2009. 相似文献
912.
J.-F. Daigle O. Kosareva N. Panov M. Bégin F. Lessard C. Marceau Y. Kamali G. Roy V. P. Kandidov S. L. Chin 《Applied physics. B, Lasers and optics》2009,94(2):249-257
A simple method to produce longer filaments with higher ionization density in air by controlling the diameter of an aperture
in the laser beam path is studied via an analysis of the backscattered N2 fluorescence collected by LIDAR. Significant increase in the fluorescence signal (approximately by a factor of five depending
on the conditions) and an increased filament length was observed at an optimum diameter. 3D + time stochastic numerical simulations
have shown that the optimum aperture size corresponds to the case of multiple filament ‘squeezing’ around the propagation
axis forming the regularized elongated structure with higher overall amount of plasma. The optimum range of aperture sizes
is the same for the initial transverse perturbation scale variation at least within a factor of three. 相似文献
913.
L. R. Calixto M. C. Bandéca F. B. Silva A. N. S. Rastelli S. T. Porto-Neto M. F. Andrade 《Laser Physics》2009,19(8):1867-1871
The purpose of this study was to evaluate the effectiveness of different light-curing units on the bond strength (push-out) of glass fiber posts in the different thirds of the root (cervical, middle and apical) with different adhesive luting resin systems (dual-cure total-etch; dual-cured and self-etch bonding system; and dual-cure self-adhesive cements), Disks of the samples (n = 144) were used, with approximately 1 mm of thickness of 48 bovine roots restored with glass fiber posts, that were luted with resin cements photo-activated by halogen LCU (QTH, Optilux 501) and blue LED (Ultraled), with power densities of 600 and 550 mW/cm2, respectively. A universal testing machine (MTS 810 Material Test System) was used with a 1 mm diameter steel rod at cross-head speed of 0.5 mm/min until post extrusion, with load cell of 50 kg, for evaluation of the push-out strength in the different thirds of each sample. The push-out strength values in kgf were converted to MPa and analyzed through Analysis of Variance and Tukey’s test, at significance level of 5%. The results showed that there were no statistical differences between the QTH and LED LCUs. The self-adhesive resin cement had lower values of retention. The total-etch and self-adhesive system resin cements seem to be a possible alternative for glass fiber posts cementation into the radicular canal and the LED LCU can be applied as an alternative to halogen light on photo-activation of dual-cured resin cements. 相似文献
914.
G. Guéna J. Corde S. Fouilloux J. -B. d’Espinose F. Lequeux L. Talini 《The European physical journal. E, Soft matter》2009,28(4):463-468
The present work deals with emulsions of volatile alkanes in an aqueous clay suspension, Laponite, which forms a yield stress
fluid. For a large enough yield stress (i.e. Laponite concentration), the oil droplets are prevented from creaming and the emulsions are thus mechanically stabilized.
We have studied the evaporation kinetics of the oil phase of those emulsions in contact with the atmosphere. We show that
the evaporation process is characterized by the formation of a sharp front separating the emulsion from a droplet-free Laponite
phase, and that the displacement of the front vs. time follows a diffusion law. Experimental data are confronted to a diffusion-controlled model, in the case where the limiting
step is the diffusion of the dissolved oil through the aqueous phase. The nature of the alkane, as well as its volume fraction
in the emulsion, has been varied. Quantitative agreement with the model is achieved without any adjustable parameter and we
describe the mechanism leading to the formation of a front. 相似文献
915.
Fajardo M. Pérez Alcázar G. A. Moreira A. M. Speziali N. L. 《Hyperfine Interactions》2004,158(1-4):395-400
The local environment of implanted 111Ag (t
1/2 = 7.45 d) in single-crystalline [0001] ZnO was evaluated by means of the perturbed angular correlation (PAC) technique. Following
the 60 keV low dose (1 × 1013 cm−2) 111Ag implantation, the PAC measurements were performed for the as-implanted state and following 30 min air annealing steps,
at temperatures ranging from 200 to 1050°C. The results revealed that 42% of the probes are located at defect-free SZn sites (ν
Q ∼ 32 MHz, η = 0) in the as-implanted state and that this fraction did not significantly change with annealing. Moreover, a progressive
lattice recovery in the near vicinity of the probes was observed. Different EFGs assigned to point defects were furthermore
measured and a general modification of their parameters occurred after 600°C. The 900°C annealing induced the loss of 30%
of the 111Ag atoms, 7% of which were located in regions of high defects concentration. 相似文献
916.
P.?SantiagoEmail author J.A.?Ascencio D.?Mendoza M.?Pérez-Alvarez A.?Espinosa C.?Reza-SanGermán P.?Schabes-Retchkiman G.A.?Camacho-Bragado M.?José-Yacamán 《Applied Physics A: Materials Science & Processing》2004,78(4):513-518
In the present work we report the synthesis of MoS2 nanotubes with diameters greater than 10 nm using a template method. The length and properties of these nanotubes are a direct result of the preparation method. High-resolution transmission electron microscopy is used to study the structure of these highly curved entities. Molecular dynamics simulations of MoS2 nanotubes reveal that one of the stable forms of the nanotubes is a twisted one. The twisting of the nanotubes produces a characteristic contrast in the images, which is also studied using simulation methods. The analysis of the local contrast close to the perpendicular orientation shows geometrical arrays of dots in domain-like structures, which are demonstrated to be a product of the atomic overlapping of irregular curvatures in the nanotubes. The configuration of some of the experimentally obtained nanotubes is demonstrated to be twisted with a behavior suggesting partial plasticity. PACS 61.16.Bg; 79.60.Jv; 61.46.+w; 61.50.Ah 相似文献
917.
J.J.?RomeroEmail author M.R.B.?Andreeta E.R.M.?Andreeta L.E.?Bausá A.C.?Hernandes J.?García Solé 《Applied Physics A: Materials Science & Processing》2004,78(7):1037-1042
The growth from ceramic pedestals of single crystal fibers of strontium barium niobate (SBN), doped with different Nd concentrations, was studied. High-quality fibers were grown for Nd doping levels of up to 4.2 at.%, and doping levels as high as 9.9 at.% were reached. No signs of core effects were observed, even for the highest concentration samples. The emission spectra of Nd3+ ions in the fibers did not differ from those obtained from bulk SBN crystals, showing very broad bands due to the typical disorder of the crystallographic tungsten-bronze structure. Fluorescence quenching was clearly observed for Nd doping levels above 2 at.%. PACS 81.10.Fq; 78.55.-m 相似文献
918.
A numerical study of the guided modes in a water-saturated poroelastic plate that obeys the Biot theory is presented. In the first part, we study the leaky guided modes and the angular resonances when the slow wave does not propagate. Two types of guided modes exist. The first ones occur from coupling of the fast longitudinal wave with the shear wave; most of them propagate whatever the frequency is, provided that it is not close to their cut-off frequencies. The leaky guided modes of the second type occur from coupling of the two longitudinal waves and the shear wave. These modes do not propagate (they are highly damped) as long as the slow wave remains diffusive. We show that the characteristics of the angular resonances can be linked to the leaky guided waves of the first type in the same way as for an elastic plate. The guided modes of the second type may not be associated to angular resonances. In the second part, we consider a thinner plate in a higher frequency range so that the slow wave can propagate. Once again its influence is studied both on the leaky guided modes and on the angular resonances. 相似文献
919.
Bailly J. L. Caso C. Chiba Y. Dibon H. Epp B. Ferrando A. Fontanelli F. Ganguli S. N. Gémesy T. Gurtu A. Hamatsu R. Hidas P. Hirose T. Hrubec J. Ivanyshenkov Yu. Kageya T. Khalatyan N. Kistenev E. Kita I. Kitamura S. Kubik V. MacNaughton J. Malhotra P. K. Matsumoto S. Mittra I. S. Montanet L. Neuhofer G. Pinter G. Porth P. Raghavan R. Rodrigo T. Singh J. Squarcia S. Takahashi K. Tanaka R. Tikhonova L. A. Trevisan U. Yamagata T. Zholobov G. Zotkin S. A. 《Zeitschrift fur Physik C Particles and Fields》1989,43(3):341-348
Zeitschrift für Physik C Particles and Fields - Correlations among identically charged pions were measured for pions produced inp p collisions at 360 GeV/c using the EHS spectrometer. The... 相似文献
920.
Merlet D Béguin L Courtieu J Giraud N 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2011,209(2):315-322
The application of the G-SERFph pulse sequence is presented on enantiomeric mixtures dissolved in a chiral liquid crystal. It aims at editing, within one single 2D spectrum, every proton coupling which is experienced by a given proton site in the molecule, and leads to real phased T-edited spectroscopy (T=J+2D). This NMR experiment is based on the combination of homonuclear semi-selective refocusing techniques with a spatial frequency encoding of the sample. This approach, which consists in handling selectively each coupling in separate cross sections of the sample, is applied to the visualization of enantiomers dissolved in a chiral liquid crystalline phase. Advantages and limits of this methodology are widely discussed. 相似文献