全文获取类型
收费全文 | 466篇 |
免费 | 28篇 |
专业分类
化学 | 304篇 |
晶体学 | 1篇 |
力学 | 21篇 |
数学 | 66篇 |
物理学 | 102篇 |
出版年
2023年 | 5篇 |
2022年 | 11篇 |
2021年 | 15篇 |
2020年 | 21篇 |
2019年 | 7篇 |
2018年 | 18篇 |
2017年 | 11篇 |
2016年 | 19篇 |
2015年 | 27篇 |
2014年 | 27篇 |
2013年 | 26篇 |
2012年 | 49篇 |
2011年 | 47篇 |
2010年 | 24篇 |
2009年 | 18篇 |
2008年 | 28篇 |
2007年 | 29篇 |
2006年 | 25篇 |
2005年 | 22篇 |
2004年 | 14篇 |
2003年 | 16篇 |
2002年 | 10篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
排序方式: 共有494条查询结果,搜索用时 15 毫秒
461.
Romain Melet Valia Voliotis Roger Grousson Xue-Lun Wang Aristide Lemaître Anthony Martinez 《Superlattices and Microstructures》2008,43(5-6):474
By means of an original all-optical experimental technique using microphotoluminescence in a waveguiding geometry, resonant coherent manipulation of quantum states in a single quantum dot becomes possible now. Resonant Rabi oscillation of the fundamental exciton state in a single quantum dot has been realized. We present the results obtained on two different kinds of samples: InAs/GaAs self-assembled quantum dots and naturally formed GaAs quantum dots by thickness fluctuations. 相似文献
462.
Noël R Vanucci-Bacqué C Fargeau-Bellassoued MC Lhommet G 《The Journal of organic chemistry》2005,70(22):9044-9047
[reaction: see text] The preparation of new chiral 6-carbonyl 2,3,8,8a-tetrahydro-7H-oxazolo[3,2-a]pyridines by an efficient two-step procedure is described. 相似文献
463.
464.
M. Girod J. Libert J.-P. Delaroche P. Romain 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):209-212
The structure properties of the even-even nuclei 226, 228, 230, 232, 234Th, 230, 232, 234, 236, 238, 240U, 240, 242, 244, 246Pu, and 242, 244, 246, 248Cm have been investigated at normal and superdeformed shapes in microscopic mean-field calculations based on Gogny force.
Collective levels are predicted from constrained Hartree-Fock-Bogoliubov and configuration mixing calculations. Two quasiparticle
states are also predicted from blocking calculations for neutron and proton configurations. Predictions are shown and compared
with experimental data at superdeformed shapes.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: michel-g.girod@cla.tr 相似文献
465.
Romain E. Kania Dana M. Hartl Stphane Hans Shinji Maeda Jacqueline Vaissiere Daniel F. Brasnu 《Journal of voice》2006,20(1):18-24
This study was designed to develop a database for the electroglottographic measurement of fundamental frequency (Fo) in normal subjects in running speech, for reference in the diagnosis and follow-up of dysphonic patients. A prospective pilot study included 20 healthy male volunteers without laryngeal disorder. Electroglottographic recordings of speaking Fo during connected speech (French) were obtained from two texts with different prosodic content. Fo histograms were sensitive to the variation of speaking Fo between both texts. Graphic representation of the range and distribution of the Fo of the speaker were designed as normalized Fo histograms with plot lines at 5th and 95th percentiles. Less than 5% variability of Fo histograms was recorded when recording more than 15 subjects. This pilot study designed a graphic display of standardized electroglottographic Fo measurements during the physiological condition of connected speech. As the degree of Fo variability depends on the phonetic contents of the text and on the language spoken, a separate histogram for normal subjects needs to be developed in each country or at least for each voice laboratory, with a standard, previously chosen text. 相似文献
466.
Romain?Abraham Jean-Fran?ois?DelmasEmail author 《Probability Theory and Related Fields》2004,128(4):475-516
We consider a Brownian snake (Ws,s0) with underlying process a reflected Brownian motion in a bounded domain D. We construct a continuous additive functional (Ls,s0) of the Brownian snake which counts the time spent by the end points s of the Brownian snake paths on D. The random measure Z=sdLs is supported by D. Then we represent the solution v of u=4u2 in D with weak Neumann boundary condition 0 by using exponential moment of (Z,) under the excursion measure of the Brownian snake. We then derive an integral equation for v. For small it is then possible to describe negative solution of u=4u2 in D with weak Neumann boundary condition . In contrast to the exit measure of the Brownian snake out of D, the measure Z is more regular. In particular we show it is absolutely continuous with respect to the surface measure on D for dimension 2 and 3.Mathematics Subject Classification (2000):60J55, 60J80, 60H30, 60G57, 35C15, 35J65 相似文献
467.
Romain Dujardin 《Journal of Geometric Analysis》2005,15(1):25-47
We study the structure of a class of laminar closed positive currents on ℂℙ2, naturally appearing in birational dynamics. We prove such a current admits natural non intersecting leaves, that are closed
under analytic continuation. As a consequence it can be seen as a foliation cycle a weak lamination. 相似文献
468.
Stomp R Miyahara Y Schaer S Sun Q Guo H Grutter P Studenikin S Poole P Sachrajda A 《Physical review letters》2005,94(5):056802
Single-electron charging in an individual InAs quantum dot was observed by electrostatic force measurements with an atomic-force microscope (AFM). The resonant frequency shift and the dissipated energy of an oscillating AFM cantilever were measured as a function of the tip-back electrode voltage, and the resulting spectra show distinct jumps when the tip was positioned above the dot. The observed jumps in the frequency shift, with corresponding peaks in dissipation, are attributed to a single-electron tunneling between the dot and the back electrode governed by the Coulomb blockade effect, and are consistent with a model based on the free energy of the system. The observed phenomenon may be regarded as the "force version" of the Coulomb blockade effect. 相似文献
469.
The electromagnetic coupling between a two-dimensional grating of resonant gold nanoparticles and a gold metallic film is investigated. We report on the observation of multipeaks in the extinction spectra attributed to resonant modes of the hybrid system, resulting from the coupling between the localized plasmon of the nanoparticles with the underlying surface plasmon mode. Simulations based on the Fourier modal method give good agreement with the experimental measurements and allow for the identification of the respective contributions. 相似文献
470.
Laure?Verret Romain?Goutagny Patrice?Fort Laurène?Cagnon Denise?Salvert Lucienne?Léger Romuald?Boissard Paul?Salin Christelle?Peyron Pierre-Hervé?LuppiEmail author 《BMC neuroscience》2003,4(1):19