全文获取类型
收费全文 | 662篇 |
免费 | 18篇 |
国内免费 | 16篇 |
专业分类
化学 | 1篇 |
物理学 | 695篇 |
出版年
2024年 | 1篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 16篇 |
2015年 | 9篇 |
2014年 | 9篇 |
2012年 | 8篇 |
2011年 | 31篇 |
2010年 | 18篇 |
2009年 | 6篇 |
2008年 | 29篇 |
2007年 | 21篇 |
2006年 | 41篇 |
2005年 | 63篇 |
2004年 | 65篇 |
2003年 | 80篇 |
2002年 | 21篇 |
2001年 | 17篇 |
2000年 | 10篇 |
1999年 | 22篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 13篇 |
1995年 | 16篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 15篇 |
1989年 | 23篇 |
1988年 | 33篇 |
1987年 | 17篇 |
1986年 | 21篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 6篇 |
1977年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有696条查询结果,搜索用时 15 毫秒
101.
The ZEUS Collaboration S. Chekanov et al. 《The European Physical Journal C - Particles and Fields》2002,25(2):169-187
Diffractive dissociation of virtual photons, , has been studied in ep interactions with the ZEUS detector at HERA. The data cover photon virtualities 0.17 < Q
2
< 0.70 GeV2 and 3 < Q
2
< 80 GeV2 with 3 < MX < 38 GeV, where MX is the mass of the hadronic final state. Diffractive events were selected by two methods: the first required the detection
of the scattered proton in the ZEUS leading proton spectrometer (LPS); the second was based on the distribution of MX. The integrated luminosities of the low- and high-Q2 samples used in the LPS-based analysis are 0.9 pb-1 and 3.3 pb-1, respectively. The sample used for the MX-based analysis corresponds to an integrated luminosity of 6.2 pb-1. The dependence of the diffractive cross section on W, the virtual photon-proton centre-of-mass energy, and on Q2 is studied. In the low-Q2 range, the energy dependence is compatible with Regge theory and is used to determine the intercept of the Pomeron trajectory.
The W dependence of the diffractive cross section exhibits no significant change from the low-Q2 to the high-Q2 region. In the low-Q2 range, little Q2 dependence is found, a significantly different behaviour from the rapidly falling cross section measured for Q
2
> 3 GeV2. The ratio of the diffractive to the virtual photon-proton total cross section is studied as a function of W and Q2. Comparisons are made with a model based on perturbative QCD.
Received: 27 March 2002 / Published online: 9 August 2002 相似文献
102.
The qq+q Collaboration F. Farchioni et al. 《The European Physical Journal C - Particles and Fields》2002,26(2):237-251
Two degenerate flavors of quarks are simulated with small masses down to about one fifth of the strange quark mass by using
the two-step multi-boson (TSMB) algorithm. The lattice size is with lattice spacing about which is not far from the N
t
=4 thermodynamical cross-over line. Autocorrelations of different physical quantities are estimated as a function of the quark
mass. The eigenvalue spectra of the Wilson-Dirac operator are investigated.
Received: 20 June 2002 / Revised version: 30 August 2002 / Published online: 25 October 2002 相似文献
103.
104.
105.
106.
We present some physics possibilities with an iron calorimeter detector (ICAL) and a status report on the feasibility study
to construct such a detector at a future possible India-based Neutrino Observatory (INO). This talk was given at the workshop
on high energy physics phenomenology, WHEPP-8, in Jan. 2004, at IIT Bombay. 相似文献
107.
The DELPHI Collaboration J. Abdallah et al. 《The European Physical Journal C - Particles and Fields》2003,26(4):505-525
In some supersymmetric models, the gluino () is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy
signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino
is not constrained by hadron collider results, which looked for the decay . Data collected by the DELPHI detector in 1994 at 91.2 GeV have been analysed to search for events. No deviation from Standard Model predictions is observed and a gluino mass between 2 and 18 GeV/c2 is excluded at the 95% confidence level in these models. Then, R-hadrons produced in the squark decays were searched for
in the data collected by DELPHI at the centre-of-mass energies of 189 to 208 GeV, corresponding to an overall integrated luminosity
of 609 Pb-1. The observed number of events is in agreement with the Standard Model predictions. Limits at 95% confidence level are derived
on the squark masses from the excluded regions in the plane ()
GeV/c2, and GeV/c2 for purely left squarks.
GeV/c2, and GeV/c2 independent of the mixing angle.
Received: 6 November 2002 / Published online: 15 January 2003 相似文献
108.
D. Beck F. Ames G. Audi G. Bollen H.-J. Kluge A. Kohl M. König I. Martel D. Lunney R.B. Moore H. Raimbault-Hartmann M. de Saint Simon E. Schark S. Schwarz J. Szerypo the ISOLDE Collaboration 《Hyperfine Interactions》1997,108(1-3):219-225
First direct mass measurements on rare earth isotopes around 146Gd have been performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. More than 40 isotopes of the elements
Pr, Nd, Pm, Sm, Eu, Dy and Ho have been measured with an accuracy of typically 1 × 10-7. In the case of 141Sm isomeric and ground state (ΔE = 175 keV) were resolved. Since isobaric contaminations are present in the ISOLDE beam, these
measurements on rare earth isotopes became only possible after the installation of a new cooler trap which acts an isobar
separator.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
109.
The ZEUS Collaboration S. Chekanov et al. 《The European Physical Journal C - Particles and Fields》2003,28(2):175-201
Cross sections for e-p neutral current deep inelastic scattering have been measured at a centre-of-mass energy of 318 GeV using an integrated luminosity
of 15.9 pb-1 collected with the ZEUS detector at HERA. Results on the double-differential cross-section in the range 185 < Q
2
< 50 000 GeV2 and 0.0037 < x < 0.75, as well as the single-differential cross-sections , and for Q
2
> 200 GeV2, are presented. To study the effect of Z-boson exchange, has also been measured for Q
2
> 10 000 GeV2. The structure function xF3 has been extracted by combining the e-p results presented here with the recent ZEUS measurements of e+p neutral current deep inelastic scattering. All results agree well with the predictions of the Standard Model.
Received: 2 August 2002 / Revised version: 30 January 2003 / Published online: 24 March 2003 相似文献
110.
R. Bertini O. Bing P. Birien K. Braune W. Brückner H. Catz A. Chaumeaux M. A. Faessler R. -W. Frey D. Garreta T. J. Ketel K. Kilian B. Mayer J. Niewisch B. Pietrzyk B. Povh H. G. Ritter M. Uhrmacher Heidelberg -Saclay-Strasbourg Collaboration 《Nuclear Physics A》1981,360(2):315-330
Cross sections for the production of hypernuclei were measured in the reaction A(K−, π−) ΛA. on light and heavy nuclear targets, using a separated K− beam at the CERN Proton Synchrotron. The pions were detected in the forward direction. The results are compared with cross sections calculated under the assumption that the reaction took place on a single neutron. The good agreement between the measured and the calculated cross sections justifies the use of the (K−, π−) reaction in order to obtain spectroscopic information on hypernuclei. 相似文献