全文获取类型
收费全文 | 1049篇 |
免费 | 30篇 |
国内免费 | 2篇 |
专业分类
化学 | 512篇 |
晶体学 | 10篇 |
力学 | 12篇 |
数学 | 102篇 |
物理学 | 445篇 |
出版年
2022年 | 6篇 |
2021年 | 6篇 |
2018年 | 10篇 |
2016年 | 13篇 |
2015年 | 20篇 |
2014年 | 22篇 |
2013年 | 46篇 |
2012年 | 24篇 |
2011年 | 36篇 |
2010年 | 30篇 |
2009年 | 20篇 |
2008年 | 33篇 |
2007年 | 38篇 |
2006年 | 29篇 |
2005年 | 32篇 |
2004年 | 50篇 |
2003年 | 19篇 |
2002年 | 21篇 |
2001年 | 31篇 |
2000年 | 24篇 |
1999年 | 16篇 |
1998年 | 17篇 |
1997年 | 19篇 |
1996年 | 30篇 |
1995年 | 29篇 |
1994年 | 26篇 |
1993年 | 19篇 |
1992年 | 14篇 |
1991年 | 14篇 |
1990年 | 18篇 |
1989年 | 27篇 |
1988年 | 13篇 |
1987年 | 16篇 |
1986年 | 19篇 |
1985年 | 18篇 |
1984年 | 26篇 |
1983年 | 13篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 9篇 |
1979年 | 19篇 |
1978年 | 13篇 |
1977年 | 7篇 |
1976年 | 17篇 |
1975年 | 8篇 |
1974年 | 28篇 |
1973年 | 11篇 |
1972年 | 7篇 |
1967年 | 6篇 |
1928年 | 5篇 |
排序方式: 共有1081条查询结果,搜索用时 31 毫秒
21.
Kramer RM Li C Carter DC Stone MO Naik RR 《Journal of the American Chemical Society》2004,126(41):13282-13286
Self-assembled particles of genetically engineered human L subunit ferritin expressing a silver-binding peptide were used as nanocontainers for the synthesis of silver nanoparticles. The inner cavity of the self-assembled protein cage displays a dodecapeptide that is capable of reducing silver ions to metallic silver. This chimeric protein cage when incubated in the presence of silver nitrate exhibits the growth of a silver nanocrystal within its cavity. Our studies indicate that it is possible to design chimeric cages, using specific peptide templates, for the growth of other inorganic nanoparticles. 相似文献
22.
I. Belič T. Kastelic-Suhadolc R. Kavčič J. Marsel V. Kramer B. Kralj 《Tetrahedron》1976,32(24):3045-3049
The oxidation of higher aliphatic ethers with oxygen at 50° yields two peroxides as the main oxidation products for each ether, namely a dihydroperoxy-dialkyl ether and a dihydroperoxy-dialkyl peroxide. The mass spectra of these compounds are recorded and the main fragmentation pattern is discussed. 相似文献
23.
I.A. Schneider D. Kramer A. Wokaun G.G. Scherer 《Electrochemistry communications》2005,7(12):1393-1397
A method for performing neutron radiography and locally resolved impedance spectroscopy simultaneously in situ in an operating polymer electrolyte fuel cell (PEFC) is presented. The new method provides concurrently spatially resolved information about the local cell performance, the locally limiting processes, and the liquid water distribution. Information about the impact of water on cell performance and limiting processes can be gained in situ on a local scale in an operating PEFC. The method was applied to a PEFC operated on pure H2/O2 in co-flow mode under low humidity operating conditions. The results show that in co-flow mode strong flooding and severe drying can occur at the very same time in different sections of a PEFC. 相似文献
24.
25.
We have calculated inclusive single-jet production in lowQ
2 ep-collisions at next-to-leading order superimposing direct and resolved contributions. The results are compared with recent experimental results from the ZEUS Collaboration at HERA.Supported by Graduiertenkolleg der DFG Erzeugung und Zerfälle von Elementarteilchen an der Universität Dortmund 相似文献
26.
Binnewies J. Knieh B. A. Kramer G. 《Zeitschrift fur Physik C Particles and Fields》1995,65(3):471-480
We present new sets of fragmentation functions for charged pions and kaons, both at leading and next-to-leading order. They are fitted to TPC data taken at energy
=29 GeV and describe excellently a wealth of othere
+
e
– data on charged-hadron production, ranging from
=5.2 GeV way up to LEP 1 energy. They also agree with data on the production of neutral pions and kaons, if one makes the natural assumption that the respective fragmentation functions are related to the charged counterparts bySU(2) symmetry. We also list simple parameterizations of thex andQ
2 dependence of our results, which may be implemented conveniently in applications.Supported by Bundesministerium für Forschung und Technologie, Bonn, Germany, under Contract 05 6 HH 93P (5), and by EEC ProgramHuman Capital and Mobility through NetworkPhysics at High Energy Colliders under Contract CHRX-CT93-0357 (DG12 COMA) 相似文献
27.
28.
29.
Close to a supercritical Hopf bifurcation, oscillatory media may be described, by the complex Ginzburg-Landau equation. The most important spatiotemporal behaviors associated with this dynamics are reviewed here. It is shown, on a few concrete examples, how real chemical oscillators may be described by this equation, and how its coefficients may be obtained from the experimental data. Furthermore, the effect of natural forcings, induced by the experimental realization of chemical oscillators in batch reactors, may also be studied in the framework of complex Ginzburg-Landau equations and its associated phase dynamics. We show, in particular, how such forcings may locally transform oscillatory media into excitable ones and trigger the formation of complex spatiotemporal patterns. 相似文献
30.
We have calculated the leading and next-to-leading logarithm coefficients ofO(α s 2 )e + e ? annihilation jet cross sections, thrust distribution and energy-energy correlation in the two-jet limit when the jet resolution and the event shape variables vanish. We have compared our results with expectations based on leading logarithm approximations used to resum the pertubative cross sections where this is possible. There is good agreement for the leading and next-to-leading coefficients of jet cross sections in the Durham scheme. Also for the thrust distribution and energy-energy correlation we find results which are consistent with the leading logarithm predictions. 相似文献