全文获取类型
收费全文 | 1715篇 |
免费 | 84篇 |
专业分类
化学 | 831篇 |
晶体学 | 5篇 |
力学 | 75篇 |
数学 | 403篇 |
物理学 | 485篇 |
出版年
2023年 | 29篇 |
2021年 | 26篇 |
2020年 | 33篇 |
2019年 | 23篇 |
2018年 | 35篇 |
2017年 | 34篇 |
2016年 | 82篇 |
2015年 | 43篇 |
2014年 | 52篇 |
2013年 | 101篇 |
2012年 | 46篇 |
2011年 | 33篇 |
2010年 | 44篇 |
2009年 | 38篇 |
2008年 | 42篇 |
2007年 | 58篇 |
2006年 | 46篇 |
2005年 | 25篇 |
2004年 | 16篇 |
2003年 | 25篇 |
2002年 | 29篇 |
2001年 | 24篇 |
2000年 | 22篇 |
1999年 | 28篇 |
1998年 | 25篇 |
1997年 | 18篇 |
1996年 | 30篇 |
1995年 | 28篇 |
1994年 | 19篇 |
1993年 | 17篇 |
1991年 | 26篇 |
1990年 | 22篇 |
1989年 | 15篇 |
1987年 | 18篇 |
1986年 | 20篇 |
1985年 | 20篇 |
1982年 | 15篇 |
1981年 | 21篇 |
1980年 | 22篇 |
1979年 | 19篇 |
1978年 | 18篇 |
1977年 | 27篇 |
1976年 | 14篇 |
1973年 | 14篇 |
1938年 | 15篇 |
1934年 | 17篇 |
1933年 | 14篇 |
1927年 | 14篇 |
1925年 | 14篇 |
1915年 | 14篇 |
排序方式: 共有1799条查询结果,搜索用时 15 毫秒
91.
R.-D. Herzberg N. Amzal J.E. Bastin F. Becker P.M.T. Brew P.A. Butler A.J.C. Chewter J.F.C. Cocks O. Dorvaux K. Eskola J. Gerl P.T. Greenlees N.J. Hammond K. Hauschild K. Helariutta F. Heßberger M. Houry A. Hürstel R.D. Humphreys G.D. Jones P.M. Jones R. Julin S. Juutinen H. Kankaanpää H. Kettunen T.L. Khoo W. Korten P. Kuusiniemi Y. Le Coz M. Leino A.P. Leppänen C.J. Lister R. Lucas M. Muikku P. Nieminen R.D. Page T. Page P. Rahkila P. Reiter Ch. Schlegel C. Scholey G. Sletten O. Stezowski Ch. Theisen W.H. Trzaska J. Uusitalo H.J. Wollersheim 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):205-208
In-beam conversion electron spectroscopy experiments have been performed on the transfermium nuclei 253, 254No using the conversion electron spectrometer SACRED in nearly collinear geometry in conjunction with the gas-filled separator
RITU at the University of Jyv?skyl?. The experimental setup is discussed and the spectra are compared to Monte Carlo simulations.
The implications for the ground-state configuration of 253No are discussed.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: rdh@ns.ph.liv.ac.uk
RID="b"
ID="b"Present address: GANIL, F-14021 Caen, France.
RID="c"
ID="c"Permanent address: IReS Strasbourg, IN2P3-CNRS, F-67037-Strasbourg, France.
RID="d"
ID="d"Present address: CEA/DIF DCRE/SDE/LDN F-91680 Bruyeres-le-Chatel.
RID="e"
ID="e"Present address: Daresbury Laboratory, Daresbury WA4 4AD, UK.
RID="f"
ID="f"Permanent address: IPN Lyon, IN2P3-CNRS, F-69037 Lyon, France. 相似文献
92.
93.
Paulsen H Antons S Brandes A Lögers M Müller SN Naab P Schmeck C Schneider S Stoltefuß J 《Angewandte Chemie (International ed. in English)》1999,38(22):3373-3375
Seemingly heartbreaking for a stereochemist, the one-step selective construction of a stereopentad and its prompt destruction by aromatization has been proven to be an efficient strategy for the synthesis of fivefold substituted, pharmacologically highly active arenes (see scheme). 相似文献
94.
Assuming that the conduction electrons of an amorphous metal contribute to the binding, we investigate whether a magnetic field will influence the transition from the amorphous to the crystalline state. Measurements taken on amorphous Bi, Ga and Yb films show no change in the crystallization temperatures within an accuracy of ±0.1 K due to a magnetic field of 18.5 T parallel to the surface of the films.Dedicated to Prof. Dr. W. Buckel on the occasion of his 60th birthday 相似文献
95.
The industrial process of coating flat surfaces with polymeric substances is numerically simulated by solving the full equations of motion for a flow through a contraction with a moving boundary. The four-constant Oldroyd constitutive equation is used to represent the viscoelastic fluid. Some adjustments to existing finite-difference methods are made in such a way as to avoid singular iterative matrices during the solution process. Results are presented for flow situations with Weissenberg numbers up to about three times larger than any previously published results for this problem. 相似文献
96.
97.
98.
E. Martini H. Kämmerer H. Fasold F. Kloos M. Fleißner K. Dehnicke O. Fuchs 《Colloid and polymer science》1981,259(8):865-872
Ohne Zusammenfassung 相似文献
99.
100.
Excitation functions of the analyzing power in elastic proton-proton scattering from 0.45 to 2.5 GeV
M. Altmeier F. Bauer J. Bisplinghoff K. Büßer M. Busch T. Colberg L. Demirörs H. P. Engelhardt P. D. Eversheim K. O. Eyser O. Felden R. Gebel M. Glende J. Greiff F. Hinterberger E. Jonas H. Krause T. Lindemann J. Lindlein B. Lorentz R. Maier R. Maschuw A. Meinerzhagen D. Prasuhn H. Rohdjeß D. Rosendaal P. von Rossen N. Schirm V. Schwarz W. Scobel H. -J. Trelle K. Ulbrich E. Weise A. Wellinghausen R. Ziegler 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):351-364
Excitation functions AN(plab,c.m.) of the analyzing power in elastic proton-proton scattering have been measured in an internal target experiment at the Cooler Synchrotron COSY with an unpolarized proton beam and a polarized atomic hydrogen target. Data were taken continuously during the acceleration and deceleration for proton kinetic energies Tlab (momenta plab) between 0.45 and 2.5 GeV (1.0 and 3.3 GeV/c) and scattering angles 30 ° c.m. 90°. The results provide excitation functions and angular distributions of high precision and internal consistency. The data can be used as calibration standard between 0.45 and 2.5 GeV. They have significant impact on phase shift solutions, in particular on the spin triplet phase shifts between 1.0 and 1.8 GeV. 相似文献