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31.
32.
C. Proust A. Audouard V. Laukhin L. Brossard M. Honold M.-S. Nam E. Haanappel J. Singleton N. Kushch 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,21(1):31-37
We report on the inter-layer oscillatory conductance of the two-dimensional organic superconductor (BEDO-TTF)2ReO4H2O measured in static and pulsed magnetic fields of up to 15 and 52 T, respectively. In agreement with previous in-plane studies,
two Shubnikov-de Haas oscillation series linked to the two electron and the hole orbits are observed. The influence of the
magnitude and orientation of the magnetic field with respect to the conducting plane is studied in the framework of the conventional
two- and three-dimensional Lifshits-Kosevich (LK) model. Deviations of the data from this model are observed in low fields
strongly tilted with respect to the normal to the conducting plane. In this latter case, the observed behaviour is consistent
with an unexplained lowering of the cyclotron effective mass. At high magnetic field, the oscillatory data could have been
compatible with the occurrence of a magnetic breakdown orbit built from the hole and electron orbits. However, the increase
of the cyclotron effective mass, linked to the electron orbits, as the magnetic field increases above ∼12 T is consistent with a field-induced phase transition. In the lower field range, where the conventional LK model holds,
the analysis of the angle dependence of the oscillations amplitude suggests significant renormalisation of the effective Landé
factor.
Received 22 August 2000 and Received in final form 20 December 2000 相似文献
33.
Two experimental setups are used to study propagation and attenuation of blast waves. In the first one, the blast wave is
generated by a spherical detonation, and in the second one, the blast wave is created by the diffraction of a planar detonation
propagating in a tube. The similarity of these phenomena appears clearly by means of dimensionless space-time and pressure-space
diagrams of shock wave propagation. Dimensionless variables are expressed as a function of the supplied energy. Two energy
formulations are proposed: a piston model and a bulk energy model. The established diagrams cover a wide range of industrial
applications. Under critical conditions, the energy released by a planar detonation is correlated to the ignition source energy
supply and a relationship which links the critical radius of detonation to the critical tube diameter.
Received 5 July 1997 / Accepted 13 July 1998 相似文献
34.
Daniela Silva-Barbieri Fernando N. Salazar Francisco Lpez Natalia Brossard Nstor Escalona Jos R. Prez-Correa 《Molecules (Basel, Switzerland)》2022,27(4)
The unstable proteins in white wine cause haze in bottles of white wine, degrading its quality. Thaumatins and chitinases are grape pathogenesis-related (PR) proteins that remain stable during vinification but can precipitate at high temperatures after bottling. The white wine protein stabilization process can prevent haze by removing these unstable proteins. Traditionally, bentonite is used to remove these proteins; however, it is labor-intensive, generates wine losses, affects wine quality, and harms the environment. More efficient protein stabilization technologies should be based on a better understanding of the main factors and mechanisms underlying protein precipitation. This review focuses on recent developments regarding the instability and removal of white wine proteins, which could be helpful to design more economical and environmentally friendly protein stabilization methods that better preserve the products´ quality. 相似文献
35.
E. Gleeson J.A. Murphy B. Maffei W. Lanigan J. Brossard G. Cahill E. Cartwright S.E. Church J. Hinderks E. Kirby C. OSullivan 《Infrared Physics & Technology》2005,46(6):493-505
Millimetre wave corrugated waveguide-horn structures are used as both single-moded and multi-moded bolometer feeds in a number of cosmic microwave background (CMB) experiments (e.g. PLANCK, Archeops, QUaD). Such horns tend to be employed over a relatively wide bandwidth and for single-moded horns the waveguide acts as the high pass filter. In this paper we report on our investigation on how the waveguide details determine the exact location of the low frequency band edge of such corrugated horns. A sharp step-like band edge, below which there is negligible propagation, is ideally required. Furthermore any leakage below the expected cut-off, possible in corrugated guides, could lead to non-idealised cross-polar effects. Typically deeper corrugations are required in the waveguide filter than at the horn aperture for wide bandwidth operation, thus necessitating a transition section over which the corrugation depth smoothly varies. An electromagnetic mode matching technique and a surface impedance hybrid mode model are used to compute the horn transmission characteristics. We have also undertaken laboratory measurements of the band edge of prototype corrugated horns in order to test the models. 相似文献
36.
Vladimir B. Yurchenko John Anthony Murphy Jean-Michel Lamarre Julien Brossard 《International Journal of Infrared and Millimeter Waves》2004,25(4):601-616
We present Gaussian fitting parameters of simulated beams of the High Frequency Instrument (HFI) of the ESA PLANCK mission. This space probe is designed for measuring the anisotropy of temperature and polarization of the Cosmic Microwave Background (CMB). The six HFI spectral bands cover the frequency range 0.1 - 1 THz with 52 bolometers. Their beams are computed by multi-mode physical optics propagation of the source field from the apertures of the horns simulated by the scattering matrix approach. Computed power patterns are fitted by the elliptical Gaussian beams minimizing the peak difference between the two power distributions within the beam. This approximation is generally considered as acceptable from the scientific viewpoint, although we show that induced errors are far from negligible. 相似文献
37.
Mazouz M Camsonne A Camacho CM Ferdi C Gavalian G Kuchina E Amarian M Aniol KA Beaumel M Benaoum H Bertin P Brossard M Chen JP Chudakov E Craver B Cusanno F de Jager CW Deur A Feuerbach R Fieschi JM Frullani S Garçon M Garibaldi F Gayou O Gilman R Gomez J Gueye P Guichon PA Guillon B Hansen O Hayes D Higinbotham D Holmstrom T Hyde CE Ibrahim H Igarashi R Jiang X Jo HS Kaufman LJ Kelleher A Kolarkar A Kumbartzki G Laveissiere G Lerose JJ Lindgren R Liyanage N Lu HJ Margaziotis DJ Meziani ZE 《Physical review letters》2007,99(24):242501
The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e,e'gamma)X cross section measured at Q2=1.9 GeV2 and xB=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to E_{q}, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced. 相似文献
38.
Camacho CM Camsonne A Mazouz M Ferdi C Gavalian G Kuchina E Amarian M Aniol KA Beaumel M Benaoum H Bertin P Brossard M Chen JP Chudakov E Craver B Cusanno F de Jager CW Deur A Feuerbach R Fieschi JM Frullani S Garçon M Garibaldi F Gayou O Gilman R Gomez J Gueye P Guichon PA Guillon B Hansen O Hayes D Higinbotham D Holmstrom T Hyde-Wright CE Ibrahim H Igarashi R Jiang X Jo HS Kaufman LJ Kelleher A Kolarkar A Kumbartzki G Laveissière G Lerose JJ Lindgren R Liyanage N Lu HJ Margaziotis DJ 《Physical review letters》2006,97(26):262002
We present the first measurements of the e[over -->]p-->epgamma cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q(2) dependence (from 1.5 to 2.3 GeV(2)) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q(2). The helicity-independent cross section is also measured at Q(2)=2.3 GeV(2). We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation. 相似文献
39.
L. Brossard R. Clerac C. Coulon M. Tokumoto T. Ziman D.K. Petrov V.N. Laukhin M.J. Naughton A. Audouard F. Goze A. Kobayashi H. Kobayashi P. Cassoux 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,1(4):439-452
In order to understand the magnetic field-induced restoration of a highly conductive state in , static (SQUID) and dynamic (ESR and AFR) magnetization measurements were performed on polycrystalline samples and single
crystals, respectively. In addition, cantilever and resistivity measurements under steady fields were performed. While the
metal-insulator transition curve of the () phase diagram exhibits a first order character, a “spin-flop” transition line divides the insulating state when the magnetic
field is applied along the easy axis of magnetization. The effects of a RKKY-type indirect exchange and of applied magnetic
field are described within the framework of a generalized Kondo lattice, namely two chains of localised spins coupled through the itinerant spins of the 2D sheets of BETS. The calculations, which can incorporate intramolecular
electron correlations within a mean field theory, are in qualitative agreement with the field induced transition from the
antiferromagnetic insulating ground state to a canted one, i.e. a not fully oriented paramagnetic, but metallic state.
Received: 6 August 1997 / Received: 5 November 1997 / Accepted: 10 November 1997 相似文献
40.
We prove a Liouville type theorem for harmonic morphisms from to , showing that any such mapping which is defined off a polar set must be polynomial. We show that any semi-conformal mapping
from to defined by polynomials is necessarily harmonic. This result has consequences for the local behaviour of a semi-conformal
mapping between arbitrary Riemannian manifolds about a singular point.
Received December 23, 1997; in final form May 17, 1998 相似文献
Received December 23, 1997; in final form May 17, 1998 相似文献