全文获取类型
收费全文 | 898篇 |
免费 | 21篇 |
专业分类
化学 | 482篇 |
晶体学 | 5篇 |
力学 | 21篇 |
数学 | 83篇 |
物理学 | 328篇 |
出版年
2021年 | 7篇 |
2020年 | 16篇 |
2019年 | 14篇 |
2018年 | 5篇 |
2017年 | 5篇 |
2016年 | 17篇 |
2015年 | 14篇 |
2014年 | 14篇 |
2013年 | 32篇 |
2012年 | 38篇 |
2011年 | 38篇 |
2010年 | 22篇 |
2009年 | 23篇 |
2008年 | 32篇 |
2007年 | 31篇 |
2006年 | 34篇 |
2005年 | 21篇 |
2004年 | 32篇 |
2003年 | 33篇 |
2002年 | 26篇 |
2001年 | 29篇 |
2000年 | 32篇 |
1999年 | 17篇 |
1998年 | 16篇 |
1997年 | 4篇 |
1996年 | 28篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 19篇 |
1992年 | 24篇 |
1991年 | 27篇 |
1990年 | 15篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 11篇 |
1986年 | 14篇 |
1985年 | 14篇 |
1984年 | 4篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 14篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 11篇 |
1974年 | 13篇 |
1973年 | 11篇 |
1971年 | 5篇 |
1968年 | 4篇 |
排序方式: 共有919条查询结果,搜索用时 734 毫秒
71.
Entangled states whose Wigner functions are non-negative may be viewed as being accounted for by local hidden variables (LHV).
Recently, there were studies of Bell’s inequality violation (BIQV) for such states in conjunction with the well known theorem
of Bell that precludes BIQV for theories that have LHV underpinning. We extend these studies to teleportation which is also
based on entanglement. We investigate if, to what extent, and under what conditions may teleportation be accounted for via
LHV theory. Our study allows us to expose the role of various quantum requirements. These are, e.g., the uncertainty relation
among non-commuting operators, and the no-cloning theorem which forces the complete elimination of the teleported state at
its initial port. 相似文献
72.
J. Khuyagbaatar S. Hofmann F. P. Heßberger D. Ackermann S. Antalic H. G. Burkhard S. Heinz B. Kindler A. F. Lisetskiy B. Lommel R. Mann K. Nishio H. J. Schött B. Sulignano 《The European Physical Journal A - Hadrons and Nuclei》2007,34(4):355-361
Isomeric states in 214Th and 213Th were identified by means of γ -rays measured in delayed coincidence with the implanted evaporation residues. These were
produced in irradiations of 164Dy with 54Cr projectiles and separated in-flight by the velocity filter SHIP. An isomeric state of I
π = 8+ with a half-life of (1.24±0.12) μs was identified in 214Th . The configuration π[1h
9/2 ⊗ 2f
7/2] was assigned to this state. An isomeric state with a half-life of (1.4±0.4) μs was observed in 213Th . Tentatively it was assigned to an I
π = 13/2+ state. 相似文献
73.
74.
75.
76.
A laser-plasma EUV source is described, which is going to be utilized for characterization of EUV optical components and sensoric devices in the wavelength region from 11 to 13 nm. EUV radiation is generated by focusing a Nd:YAG laser into a double stream gas puff target. By the use of different target gases, broadband as well as narrow-band EUV radiation can be obtained. The emission characteristics of the radiation is monitored by the help of different diagnostic tools including a pinhole camera, an EUV spectrometer, and various EUV photodiodes, either directly or after reflection from multilayer mirrors. Theoretical calculations of collision-induced energy transfer are given in order to explain the observed high degree of electronic excitation in the utilized target gases. 相似文献
77.
O. Anselmino Stone Tollens L. Rosenthaler E. Spaeth Caesar Loretz Panchaud B. Hafner E. W. Mann John Barclay Fromme Fraser Ludwig Krauss P. Lemaire Denigés Kimpflin M. Nussbaum H. Runne C. Guérin G. Denigés Feldhaus Gregor E. Durien Fordos Geélis Utscher C. Gueérin Ernst Deussen E. Beckmann 《Analytical and bioanalytical chemistry》1912,51(10-11):700-712
78.
Heinrich Mann 《Monatshefte für Mathematik》1937,46(1):74-83
Ohne Zusammenfassung 相似文献
79.
C. Mann 《Fresenius' Journal of Analytical Chemistry》1885,24(1):201-202
Ohne Zusammenfassung 相似文献
80.
Etienne Airiau Thomas Spangenberg Nicolas Girard Dr. Angèle Schoenfelder Jessica Salvadori Maurizio Taddei Prof. André Mann Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(35):10938-10948
The development of hydroformylative domino reactions of easily accessible vinyl acetamides is described. Extremely regioselective hydroformylation of terminal double bounds provides a transient N‐acyliminium that can be trapped by various nucleophiles to give several aza‐heterocylic scaffolds in a diastereoselective manner. 相似文献