全文获取类型
收费全文 | 442篇 |
免费 | 16篇 |
国内免费 | 3篇 |
专业分类
化学 | 274篇 |
晶体学 | 3篇 |
力学 | 18篇 |
数学 | 42篇 |
物理学 | 124篇 |
出版年
2023年 | 3篇 |
2022年 | 12篇 |
2021年 | 11篇 |
2020年 | 14篇 |
2019年 | 16篇 |
2018年 | 10篇 |
2017年 | 4篇 |
2016年 | 16篇 |
2015年 | 16篇 |
2014年 | 16篇 |
2013年 | 21篇 |
2012年 | 32篇 |
2011年 | 48篇 |
2010年 | 21篇 |
2009年 | 22篇 |
2008年 | 25篇 |
2007年 | 26篇 |
2006年 | 27篇 |
2005年 | 16篇 |
2004年 | 21篇 |
2003年 | 13篇 |
2002年 | 16篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有461条查询结果,搜索用时 31 毫秒
181.
Ludovic Daumont Alain Jenouvrier Semen Mikhailenko Michel Carleer Christian Hermans Sophie Fally Ann Carine Vandaele 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(11):878-888
High-resolution water vapor absorption spectra have been measured at room temperature in the 8800–11,600 cm?1 spectral region. They were obtained using the mobile BRUKER IFS 120M Fourier transform spectrometer (FTS) from ULB-SCQP coupled to the 50 m base long multiple reflection White type cell in GSMA laboratory. The absorption path was 600 m and different H2O/HDO/D2O mixtures were used. Measurements of line positions, intensities and self-broadening coefficients were performed for the HD16O isotopologue. 6464 rovibrational assignment of the observed lines was made on the basis of global variational predictions and allowed the identification of new energy levels. 3ν3, 2ν1+ν3, 3ν1+ν2, ν1+2ν3 and 2ν2+2ν3 are the five strongest bands. The present paper provides a complementary data set on water vapor for atmospheric and astrophysical applications. 相似文献
182.
Junxia Wang Ludovic Tuduri Maurice Millet Olivier Briand Michel Montury 《Journal of chromatography. A》2009,1216(15):3031-3037
For low volatile pesticides, the applications of solid-phase microextraction (SPME) as an air sampler were reported with sampling time chosen in the linear stage of the sorption kinetics because of long equilibrium time. In these pre-equilibrium conditions, sampling rates (SRs) expressed as the volume of air sampled by the SPME sampler per unit of time, were used to estimate analytes concentrations in air. In the present study, to achieve good extraction performance and accurate calibration, the sorption kinetics of several pesticides with SPME were investigated in detail, with a focus on parameters influencing SRs. Linear air velocity was found to be the main parameter affecting SRs. For exposed fibers, with air velocities below 20–25 cm s−1, SRs increased with increasing air velocity. When linear air velocity was equal to or greater than 25–30 cm s−1, it had little effect on SRs. To improve the flexibility of SPME, different configurations of SPME were compared, i.e. different lengths of fibers exposed, retracted fibers, exposed fibers with grids. SRs were linearly proportional to exposed lengths of fibers. Using grids, lower SRs and wider calibration time range were achieved. SRs for retracted fibers were the lowest among the different experimented configurations. The accuracy of calibration was improved and more flexibility of SPME was provided. 相似文献
183.
Ludovic Drouin Dr. E. Cristina Stanca‐Kaposta Dr. Priptal Saundh Antony J. Fairbanks Dr. Sebastian Kemper Timothy D. W. Claridge Dr. John P. Simons Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(16):4057-4069
The effect of carbon is subtle but sweet : The flexible C‐linkage in the newly synthesised C‐glycosyl mimetic, Manα(1,6)‐C‐ManαOPh allows OH? π bonding, both in the gas phase and in aqueous solution. This interaction is absent in the O‐linked disaccharide (see figure).
184.
185.
Cviklinski J Ortalo J Laurat J Bramati A Pinard M Giacobino E 《Physical review letters》2008,101(13):133601
Using electromagnetically induced transparency in a cesium vapor, we demonstrate experimentally that the quantum state of a light beam can be mapped into the long-lived Zeeman coherences of an atomic ground state. Two noncommuting variables carried by light are simultaneously stored and subsequently read out, with no noise added. We compare the case where a tunable single sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same electromagnetically induced transparency window. 相似文献
186.
Gilbert J Menguy L Campbell M 《The Journal of the Acoustical Society of America》2008,123(4):1854-1857
A frequency-domain numerical model of brass instrument sound production is proposed as a tool to predict their brassiness, defined as the rate of spectral enrichment with increasing dynamic level. It is based on generalized Burger's equations dedicated to weakly nonlinear wave propagation in nonuniform ducts, and is an extension of previous work by Menguy and Gilbert [Acta Acustica 86, 798-810 (2000)], initially limited to short cylindrical tubes. The relevance of the present tool is evaluated by carrying out simulations over distances longer than typical shock formation distances, and by doing preliminary simulations of periodic regimes in a typical brass trombone bore geometry. 相似文献
187.
The point reference global correlation (PRGC) technique which combines single and global measurements as proposed by Chatellier
and Fitzpatrick (Exp Fluids 38(5):563–757, 2005) is of significant interest for the analysis of the turbulent statistics for noise source modeling in jet flows as it allows
the 2D spatio-temporal correlation functions to be obtained over a region of the flow. This enables the statistical characteristics
including inhomogeneous and anisotropic features to be determined. The sensitivity of the technique is examined in some detail
for the specific case of laser doppler velocimetry (LDV) and particle image velocimetry (PIV). Simulated data are used to
enable a parametric study of the accuracy of the PRGC technique to be determined as a function of the various measurement
parameters. The sample frequencies and the number of samples of both the LDV and PIV signals are shown to be critical to errors
associated with the estimated spatio-temporal correlations and that low data rates can lead to significant errors in the estimates.
Measurements performed in single stream and co-axial jet flows at Mach 0.24 using PIV and LDV systems are reported and the
2D space–time correlation functions for these flows are determined using the PRGC technique. The results are discussed in
the context of noise source modeling for jet flows. 相似文献
188.
Franck Delval Grgorio Crini Ludovic Janus Joëel Vebrel Michel Morcellet 《Macromolecular Symposia》2001,166(1):103-108
Crosslinked polymers containing starch have been used for the recovery of various pollutants from aqueous solutions. These polymers have been prepared by reticulation of starch‐enriched flour using epichlorohydrin as crosslinking agent. Several studies (kinetics, time, concentration, role of crosslinking agent) are presented here. The results show that these polymers exhibit high sorption capacities toward substituted phenol derivatives. The mechanism of sorption is both physical and steric adsorption in the polymer network and/or the formation of hydrogen bond and hydrophobic interactions. 相似文献
189.
Mihaela-Liliana îna Ludovic Peauger Florent Alix Cyril Papamicaël Thierry Besson Jana Sopkov-de Oliveira Santos Vincent Gembus Vincent Levacher 《Molecules (Basel, Switzerland)》2023,28(1)
The DYRK (Dual-specificity tyrosine phosphorylation-regulated kinase) family of protein kinases is involved in the pathogenesis of several neurodegenerative diseases. Among them, the DYRK1A protein kinase is thought to be implicated in Alzheimer’s disease (AD) and Down syndrome, and as such, has emerged as an appealing therapeutic target. DYRKs are a subset of the CMGC (CDK, MAPKK, GSK3 and CLK) group of kinases. Within this group of kinases, the CDC2-like kinases (CLKs), such as CLK1, are closely related to DYRKs and have also sparked great interest as potential therapeutic targets for AD. Based on inhibitors previously described in the literature (namely TG003 and INDY), we report in this work a new class of dihydroquinolines exhibiting inhibitory activities in the nanomolar range on hDYRK1A and hCLK1. Moreover, there is overwhelming evidence that oxidative stress plays an important role in AD. Pleasingly, the most potent dual kinase inhibitor 1p exhibited antioxidant and radical scavenging properties. Finally, drug-likeness and molecular docking studies of this new class of DYRK1A/CLK1 inhibitors are also discussed in this article. 相似文献
190.
Patthira Sumsalee Dr. Laura Abella Sitthichok Kasemthaveechok Dr. Nicolas Vanthuyne Marie Cordier Dr. Grégory Pieters Prof. Jochen Autschbach Dr. Jeanne Crassous Dr. Ludovic Favereau 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(66):16505-16511
Luminescent exciplexes based on a chiral electron donor and achiral acceptors are reported as a new approach to design circularly polarized (CP) and thermally activated delayed fluorescence (TADF) emitters. This strategy results in rather high CP luminescence (CPL) values with glum up to 7×10−3, one order of magnitude higher in comparison to the CPL signal recorded for the chiral donor alone (glum ∼7×10−4). This increase occurs concomitantly with a CPL sign inversion, as a result of the strong charge-transfer emission character, as experimentally and theoretically rationalized by using a covalent chiral donor-acceptor model. Interestingly, blue, green-yellow and red chiral luminescent exciplexes can be obtained by modifying with the electron accepting character of the achiral unit while keeping the same chiral donor unit. These results bring new (inter)molecular guidelines to obtain simply and efficiently multi-color CP-TADF emitters. 相似文献