全文获取类型
收费全文 | 211篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 116篇 |
力学 | 6篇 |
数学 | 10篇 |
物理学 | 80篇 |
出版年
2021年 | 4篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2016年 | 2篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 8篇 |
2011年 | 4篇 |
2010年 | 7篇 |
2009年 | 6篇 |
2008年 | 6篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1975年 | 7篇 |
1974年 | 5篇 |
1973年 | 5篇 |
1972年 | 4篇 |
1971年 | 2篇 |
1970年 | 5篇 |
1969年 | 3篇 |
1968年 | 3篇 |
1967年 | 2篇 |
排序方式: 共有212条查询结果,搜索用时 15 毫秒
1.
A. N. Vasiliev V. N. Grishin A. M. Davidenko A. A. Derevschikov Yu. A. Matulenko Yu. M. Melnik A. P. Meschanin V. V. Mochalov L. V. Nogach S. B. Nurushev A. F. Prudkoglyad P. A. Semenov L. F. Soloviev V. L. Solovianov V. Yu. Khodyrev K. E. Shestermanov A. E. Yakutin N. S. Borisov V. N. Matafonov A. B. Neganov Yu. A. Plis Yu. A. Usov A. N. Fedorov A. A. Lukhanin 《Physics of Atomic Nuclei》2004,67(8):1487-1494
Results are presented that were obtained by measuring single-spin asymmetry in the inclusive production of neutral pions in the reaction p+p ↑→ π 0+X at x F≈0. A beam of 70-GeV protons was extracted directly from the vacuum chamber of the accelerator by means of a bent single crystal. For transverse momenta in the range 1.0<p T<3.0 GeV/c, the single-spin asymmetry independently measured by two detectors is zero within the errors. This result is in agreement with Fermilab data obtained at 200 GeV, but it is at odds with CERN data measured at 24 GeV. 相似文献
2.
V. V. Barbakadze E. P. Kemertelidze I. Targamadze K. Mulkidzhanyan J. Kemink A. J. J. van den Berg K. J. Beukelman A. I. Usov 《Chemistry of Natural Compounds》2005,41(4):374-377
Two high-molecular-weight (>1000 kDa) water-soluble preparations were isolated from stems of Symphytum asperum and S. caucasicum. Their basic component was established as poly[hydroxy-1-carboxy-2-(3,4-dihydroxyphenyl)ethylene], analogous to that of high-molecular-weight
(>1000 kDa) preparations from roots of these same plants, using IR and NMR spectral data.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 303–305, July–August, 2005.
An erratum to this article is available at . 相似文献
3.
I. I. Kandror V. A. Usov I. O. Bragina T. L. Usova V. K. Bel'skii M. G. Voronkov 《Russian Chemical Bulletin》1989,38(4):811-815
1. | Radical arylation of 3-arylamino-2-phenyl-1-indenthiones with aryldiazonium fluoroborates or N-nitrosoacetanilide leads to the corresponding 1-arylamino-2-phenyl-3-arylthioindenes with high yield. Partial hydrolysis of the latter under the reaction conditions form 1-oxo-2-phenyl-3-arylthioindenes as by-products. |
2. | The similarity of thioamides and their vinylogs (the aminoindenthiones) in radical arylation reactions was established. |
4.
5.
A. Thomas N. S. Borisov H. -J. Arends A. N. Fedorov G. M. Gurevich R. L. Kondratiev M. Korolija A. B. Lazarev M. Martinez W. Meyer S. V. Mironov A. B. Neganov V. N. Pavlov H. Ortega G. Reicherz Yu. A. Usov 《Physics of Particles and Nuclei》2013,44(6):964-967
The new frozen spin polarized target for experiments at the polarized beam of the real photon facility A2 of the MAMI accelerator is described. The A2-collaboration at the Mainz Microtron MAMI is measuring photon absorption cross section using circularly and linearly polarized photons up to the energy of 1.5 GeV. The photons are produced in the’ Bremsstrahlungs’ process. In the years 2005/2006 the Crystal Ball detector with its unique capability to cope with multi photon final states was set up in Mainz. Since 2010 the experimental apparatus has been completed by a polarized target. The horizontal dilution refrigerator of the Frozen-Spin Target has been constructed and is operated in close cooperation with the Joint Institute for Nuclear Research in Dubna, Russia. The system offers the opportunity to provide longitudinally and transversely polarized protons and deuteron. In this paper the operation experience of this new Frozen-Spin Target and first results from the runs in 2010 and 2011 are presented. 相似文献
6.
7.
L. V. Timokhina E. V. Dolenko V. A. Usov D. -C. D. Toryashinova L. E. Protasova M. G. Voronkov 《Chemistry of Heterocyclic Compounds》1996,32(4):427-430
3-Thioformylindole and its previously unknown 2-methyl-, 2 -phenyl-, and 1-ethyl substituted derivatives have been synthesized by the thiolysis of the corresponding indolylmethylenimmonium perchlorates. The thioaldehydes containing no substitutdt at the nitrogen atom were isolated as crystalline solvates with DMSO and DMF. Monitoring of 3-thioformylindole formation was effected by polarography and spectrophotometry.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 493–496, April, 1996. 相似文献
8.
9.
Getmanchuk Yu. P. Itskovskaya I. N. Usov D. G. Sokolov N. I. 《Theoretical and Experimental Chemistry》2001,37(1):8-11
The photothermoplastic oligomer 1-OAGE containing unsymmetrical anthracene chromophore units has been synthesized. It possesses improved ability to form complexes with charge transfer to electron acceptors and improved information properties in comparison with the symmetrical analog 9-OAGE. 相似文献
10.
To describe photo- and meson-induced reactions on the nucleon, one is faced with a rather extensive coupled-channel problem.
Ignoring the effects of channel coupling, as one would do in describing a certain reaction at the tree level, invariably creates
a large inconsistency between the different reactions that are described. In addition, the imaginary parts of the amplitude,
which are related through the optical theorem, to total cross-sections, are directly reflected in certain polarization observables.
Performing a full coupled-channel calculation thus offers the possibility to implement the maximum number of constraints.
The drawback one is faced with is to arrive at a simultaneous fit of a large number of reaction channels. While some of the
parameters are common to many reactions, one is still faced with the challenge to optimize a large number of parameters in
a highly non-linear calculation. Here we show that such an approach is possible and present some results for photoinduced
strangeness production. 相似文献