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11.
The vibrational dephasing rate is calculated for H2-rare gas mixtures between 85 and 300 K. The semiclassical calculation which only considers unbounded trajectories is based on binary interaction of particles through a Lennard—Jones potential. A comparison is made with three-dimensional and with collinear results obtained when a purely repulsive potential is considered. It is shown that the temperature dependence of the vibrational dephasing rate increases monotonically as T rises. Experimental investigation of Q1 (1) Raman lines for n-H2 perturbed by neon, argon and krypton between 100 and 300 K has been realized. The comparison between calculated and measured linewidths suggests that bounded states have to be taken into account at the lowest temperatures considered here. 相似文献
12.
J. Bonamy D. Robert C. Boulet 《Journal of Quantitative Spectroscopy & Radiative Transfer》1984,31(1):23-34
The broadening coefficients for i.r. lines of CO perturbed by Ar are calculated in the temperature range 300–3500 K using the formalism previously developed by two of us (D.R. and J.B.). The results are compared with high-resolution spectroscopic measurements of shock-heated CO-Ar gas mixtures. A simplified model is proposed to describe the temperature dependence of the linewidths. The resulting model is applied to CO broadened by N2 and the results are critically discussed. 相似文献
13.
Jeanine Bonamy Daniel Robert 《Journal of Quantitative Spectroscopy & Radiative Transfer》1975,15(9):855-862
The half-widths of rotation, inversion and rotation-inversion spectral lines of NH3 perturbed by rare gases have been calculated. These calculations take into account the R-7 dispersion potential energy, which was previously studied by the present authors. A detailed analysis of the contribution of various induced collisional processes has shown that the ΔK = ±3 transitions induced by the dispersion potential are of importance for both the pure rotation spectrum and the inversion and rotation-inversion spectrum. 相似文献
14.
While there exists a unified theoretical framework–Linear Elastic Fracture Mechanics–to describe the failure of homogeneous materials, understanding and modeling the mechanical properties of heterogeneous media continue to raise significant fundamental challenges. Stress enhancement in the vicinity of cracks indeed makes classical homogenization methods irrelevant to predict the toughness and lifetime of heterogeneous materials. “Mean field” approaches have been proposed to estimate these quantities, but they remain limited to dilute damage. 相似文献
15.
P. Bonamy P. Borgeaud M. Crozon J.P. Guillaud O. Guisan P. Le Du P. Sonderegger J.K. Bienlein S. Mango L. Paul H. Dinter 《Nuclear Physics B》1973,52(2):392-402
Measurements of the polarization parameter of the reactions π?p → π0n and π?p → ηn at 4.90 and 7.85 GeV/c and for a squared four-momentum transfer ?t ranging from 0.1 to 2.0 (GeV/c)2 have been achieved by using a butanol polarized proton target and detecting only the two γ's from the neutral meson decay. The background due to events involving bound protons has been separately measured and subtracted out. A large positive polarization has been found for the reaction π?p → π0n. It is consistent with other pion-nucleon scattering data connected by isospin conservation. The polarization for the reaction π?p → ηn is not significantly different from zero within the large experimental errors. 相似文献
16.
J. Hussong R. Lückerath W. Stricker X. Bruet P. Joubert J. Bonamy D. Robert 《Applied physics. B, Lasers and optics》2001,73(2):165-172
This work describes a further step towards the determination of the temperature accuracy of H2 Q-branch CARS (Coherent Anti-Stokes Raman Scattering) at high pressure with regard to the influence of the H2 line widths. In laminar steady H2/air flames in the pressure range 1–15 bar and at fuel-rich conditions with stoichiometries between two and four, quasi-simultaneous
temperature measurements were performed with H2 and N2 CARS. The temperature values deduced from H2 CARS are in good agreement with the reference temperature from N2 CARS. The influence of different line-width contributions on the accuracy of H2 Q-branch thermometry was investigated in detail.
Received: 10 April 2001 / Revised version: 22 May 2001 / Published online: 18 July 2001 相似文献
17.
The magnetic microstructure and domain wall distribution of antiferromagnetic α-Fe2O3 epitaxial layers is determined by statistical image analyses. Using dichroic spectromicroscopy images, we demonstrate that the domain structure is statistically invariant with thickness and that the antiferromagnetic domain structure of the thin films is inherited from the ferrimagnetic precursor layer one, even after complete transformation into antiferromagnetic α-Fe2O3. We show that modifying the magnetic domain structure of the precursor layer is a genuine way to tune the magnetic domain structure and domain walls of the antiferromagnetic layers. 相似文献
18.
The paper reports on a detailed study of the N2–H2 collisional line broadening coefficient. High resolution stimulated Raman spectra of nitrogen–hydrogen mixtures have been recorded at liquid nitrogen and room temperatures. Corresponding linewidth calculations have been performed at temperatures between 77 and 500?K using the semiclassical Robert and Bonamy model for J rotational quantum numbers varying between 0 and 11. Comparison between experimental data and calculated results shows good agreement at room temperature using an adjusted value for the kinetic diameter. 相似文献
19.
The self-affine properties of postmortem fracture surfaces in silica glass and aluminum alloy were investigated through the 2D height-height correlation function. They are observed to exhibit anisotropy. The roughness, dynamic, and growth exponents are determined and shown to be the same for the two materials, irrespective of the crack velocity. These exponents are conjectured to be universal. 相似文献
20.
M. Afzelius P.-E. Bengtsson J. Bood J. Bonamy F. Chaussard H. Berger T. Dreier 《Applied physics. B, Lasers and optics》2002,75(6-7):771-778
Rotational coherent anti-Stokes Raman spectroscopy (CARS) is a well-established spectroscopic technique for thermometry at
pre-combustion temperatures and atmospheric pressure. However, at pressures of several MPa, a previous investigation revealed
large discrepancies between experimental data and the theoretical model. A re-evaluation has been made of these data (at room
temperature and in the range 1.5–9 MPa) with two improvements to the spectral code. The first is the inclusion of an inter-branch
interference effect, which is described in detail in Paper I. The second is the use of experimental S1-branch Raman line widths measured at 295 K, with a temperature dependence extracted from semi-classical calculations following
the Robert–Bonamy formalism. It is shown that these two modifications significantly improve the theoretical model, since both
the spectral fits and the accuracy of the evaluated temperatures are considerably improved.
Received: 18 February 2002 / Revised version: 9 July 2002 / Published online: 22 November 2002
RID="*"
ID="*"Corresponding author. Fax: +46-46/2224542, E-mail: mikael.afzelius@forbrf.lth.se 相似文献