全文获取类型
收费全文 | 104篇 |
免费 | 0篇 |
专业分类
化学 | 40篇 |
数学 | 6篇 |
物理学 | 58篇 |
出版年
2016年 | 1篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 13篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有104条查询结果,搜索用时 0 毫秒
51.
Lionel Moisan 《PAMM》2007,7(1):1041907-1041908
Because they are based on finite differences, usual discretizations of the Total Variation lead to aliased images. We propose a new discretization called spectral total variation that agrees with Shannon sampling principles and produces images that can be exactly interpolated. The quality improvement is illustrated experimentally in the case of image deblurring. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
52.
53.
Collet E Moisan N Baldé C Bertoni R Trzop E Laulhé C Lorenc M Servol M Cailleau H Tissot A Boillot ML Graber T Henning R Coppens P Buron-Le Cointe M 《Physical chemistry chemical physics : PCCP》2012,14(18):6192-6199
We report the spin state photo-switching dynamics in two polymorphs of a spin-crossover molecular complex triggered by a femtosecond laser flash, as determined by combining femtosecond optical pump-probe spectroscopy and picosecond X-ray diffraction techniques. The light-driven transformations in the two polymorphs are compared. Combining both techniques and tracking how the X-ray data correlate with optical signals allow understanding of how electronic and structural degrees of freedom couple and play their role when the switchable molecules interact in the active crystalline medium. The study sheds light on crossing the border between femtochemistry at the molecular scale and femtoswitching at the material scale. 相似文献
54.
55.
Tether S Theriot D Thurman-Keup R Tipton P Tkaczyk S Tollefson K Tollestrup A Toyoda H Trischuk W de Troconiz JF Tseng J Turini N Ukegawa F Vaiciulis T Valls J Vejcik S Velev G Vidal R Vilar R Volobouev I Vucinic D Wagner RG Wagner RL Wahl J Wallace NB Walsh AM 《Physical review letters》2000,85(20):4215-4220
We report the first observation of dijet events with a double Pomeron exchange topology produced in &pmacr;p collisions at sqrt[s] = 1800 GeV. The events are characterized by a leading antiproton, two jets in the central pseudorapidity region, and a large rapidity gap on the outgoing proton side. We present results on jet kinematics and production rates, compare them with corresponding results from single diffractive and inclusive dijet production, and test factorization. 相似文献
56.
A simple route for the preparation of 3,4,6-substituted pyridazines is described by using Tebbe olefination of esters then Diels–Alder reaction of the resulting enol ethers with tetrazine. 相似文献
57.
58.
59.
60.
M. A. Schumaker D. Cline G. Hackman C. Pearson C. E. Svensson C. Y. Wu A. Andreyev R. A. E. Austin G. C. Ball D. Bandyopadhyay J. A. Becker A. J. Boston H. C. Boston L. Buchmann R. Churchman F. Cifarelli R. J. Cooper D. S. Cross D. Dashdorj G. A. Demand M. R. Dimmock T. E. Drake P. Finlay A. T. Gallant P. E. Garrett K. L. Green A. N. Grint G. F. Grinyer L. J. Harkness A. B. Hayes R. Kanungo A. F. Lisetskiy K. G. Leach G. Lee R. Maharaj J-P. Martin F. Moisan A. C. Morton S. Mythili L. Nelson O. Newman P. J. Nolan J. N. Orce E. Padilla-Rodal A. A. Phillips M. Porter-Peden J. J. Ressler R. Roy C. Ruiz F. Sarazin D. P. Scraggs J. C. Waddington J. M. Wan A. Whitbeck S. J. Williams J. Wong 《The European Physical Journal A - Hadrons and Nuclei》2009,42(3):477-484
The low-energy structures of the radioactive nuclei 20, 21Na have been examined using Coulomb excitation at the TRIUMF-ISAC radioactive ion beam facility. Beams of ~ 5×106 ions/s were accelerated to 1.7MeV/A and Coulomb excited in a 0.5mg/cm^2 natTi target. Two TIGRESS HPGe clover detectors perpendicular to the beam axis were used for $ \gamma$ -ray detection, while scattered nuclei were observed by the Si detector BAMBINO. For 21Na , Coulomb excitation from the 3/2+ ground state to the first excited 5/2+ state was observed, while for 20Na , Coulomb excitation was observed from the 2+ ground state to the first excited 3+ and 4+ states. For both beams, B ( $ \lambda$ L) values were determined using the 2+ $ \rightarrow$ 0+ de-excitation in 48Ti as a reference. The resulting B(E2) ↓ value for 21Na is 137±9 e^2fm^4, while the resulting B( $ \lambda$ L) ↓ values for 20Na are 55±6 e^2fm^4 for the 3+ $ \rightarrow$ 2+ , 35.7±5.7 e^2 fm^4 for the 4+ $ \rightarrow$ 2+ , and 0.154±0.030 μ_N^2 for the 4+ $ \rightarrow$ 3+ transitions. This analysis significantly improves the measurement of the 21Na B(E2) value, and provides the first experimental determination of B( $ \lambda$ L) values for the proton dripline nucleus 20Na .-1 相似文献