全文获取类型
收费全文 | 1136篇 |
免费 | 24篇 |
国内免费 | 4篇 |
专业分类
化学 | 609篇 |
晶体学 | 5篇 |
力学 | 29篇 |
数学 | 192篇 |
物理学 | 329篇 |
出版年
2021年 | 9篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 27篇 |
2015年 | 23篇 |
2014年 | 13篇 |
2013年 | 40篇 |
2012年 | 55篇 |
2011年 | 56篇 |
2010年 | 44篇 |
2009年 | 39篇 |
2008年 | 39篇 |
2007年 | 47篇 |
2006年 | 40篇 |
2005年 | 37篇 |
2004年 | 38篇 |
2003年 | 28篇 |
2002年 | 29篇 |
2001年 | 30篇 |
2000年 | 32篇 |
1999年 | 18篇 |
1998年 | 25篇 |
1997年 | 21篇 |
1996年 | 17篇 |
1995年 | 12篇 |
1994年 | 17篇 |
1993年 | 20篇 |
1992年 | 17篇 |
1991年 | 21篇 |
1990年 | 16篇 |
1989年 | 12篇 |
1988年 | 13篇 |
1987年 | 13篇 |
1986年 | 7篇 |
1985年 | 17篇 |
1984年 | 20篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 13篇 |
1980年 | 15篇 |
1979年 | 16篇 |
1978年 | 18篇 |
1976年 | 8篇 |
1975年 | 16篇 |
1974年 | 10篇 |
1973年 | 11篇 |
1972年 | 7篇 |
1970年 | 8篇 |
1969年 | 9篇 |
排序方式: 共有1164条查询结果,搜索用时 15 毫秒
51.
52.
53.
Owing to their mesoscopic length scales, colloidal suspensions provide ideal model systems suitable for addressing many problems in the field of statistical physics. Exemplarily, we highlight the versatile nature of such systems by discussing experiments with stochastic resonance and a practical realization of a recently proposed ratchet cellular automaton. 相似文献
54.
Sebastian?BreuerEmail author Katrin?Pech Armin?Buss Christoph?Spitzer Juris?Ozols Elly?M?Hol Nicole?Heussen Johannes?Noth Franz-Werner?Schwaiger Andreas?B?Schmitt 《BMC neuroscience》2004,5(1):15
Background
Interruption of mature axons activates a cascade of events in neuronal cell bodies which leads to various outcomes from functional regeneration in the PNS to the failure of any significant regeneration in the CNS. One factor which seems to play an important role in the molecular programs after axotomy is the stearoyl Coenzyme A-desaturase-1 (SCD-1). This enzyme is needed for the conversion of stearate into oleate. Beside its role in membrane synthesis, oleate could act as a neurotrophic factor, involved in signal transduction pathways via activation of protein kinases C. 相似文献55.
Grabtchikov AS Chulkov RV Orlovich VA Schmitt M Maksimenko R Kiefer W 《Optics letters》2003,28(11):926-928
Raman conversion of femtosecond pulses in a solid-state medium is reported. Stimulated Raman scattering (SRS) was observed in an impulsive SRS regime when the pump pulse's duration was comparable with the period of Raman-active vibration. The generation of super broadband radiation, which is a distinguishing feature of impulsive SRS, is shown. 相似文献
56.
Schulz M Moshammer R Schmitt W Kollmus H Feuerstein B Mann R Hagmann S Ullrich J 《Physical review letters》2000,84(5):863-866
Intensity interferometry was applied to study electron correlations in doubly ionizing ion-atom collisions. In this method, the probability to find two electrons emitted in the same double ionization event with a certain momentum difference is compared to the corresponding probability for two uncorrelated electrons from two independent events. The ratio of both probabilities, the so-called correlation function, is found to sensitively reveal electron correlation effects, but it is rather insensitive to the collision dynamics. 相似文献
57.
G. Benzoni F. Azaiez S. Leoni S. Battacharyya R. Borcea A. Bracco L. Corradi D. Curien G. De France Zs. Dombrádi E. Fioretto S. Franchoo S. Grevy F. Ibrahim S. Iulian G. Mukherjee A. Navin G. Pollarolo N. Redon P. H. Regan M. Rejmund C. Schmitt G. Sletten D. Sohler M. Stanoiu S. Szilner D. Verney 《The European physical journal. Special topics》2007,150(1):83-86
A study of deep-inelastic and multi-nucleon transfer reactions to populate neutron-rich
O, Ne and F nuclei is here presented. The reaction under analysis employed a beam of radioactive
24Ne at 7.9 AMeV, provided by the
SPIRAL facility at Ganil, impingin on a 208Pb target. The reaction products have been
detected in the VAMOS spectrometer in coincidence with gamma rays
measured by the EXOGAM array. Preliminary results here presented show a selectivity
in the population of states of different nature. 相似文献
58.
F. G. Schmitt P. Chainais 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(2):149-158
We reformulate various versions of infinitely divisible cascades proposed in the literature using stochastic equations. This
approach sheds a new light on the differences and common points of several formulations that have been recently provided by
several teams. In particular, we focus on the simplification occurring when the infinitely divisible noise at the heart of
such model is stable: an independently scattered random measure becomes a stable stochastic integral. In the last section
we discuss the D-dimensional generalization. 相似文献
59.
Michael Karnahl Christian Kuhnt Frank W. HeinemannMichael Schmitt Sven Rau Jürgen Popp Benjamin Dietzek 《Chemical physics》2012,393(1):65-73
Molecular photocatalysts allow for selectively tuning their function on a molecular level based on an in-depth understanding of their chemical and photophysical properties. This contribution reports the synthesis and photophysical characterization of the novel molecular photocatalyst [(tbbpy)2Ru(tpac)PdCl2]2+RutpacPd (with tpac = tetrapyrido[3,2-a:2′,3′-c:3″,2″-h:2?,3?-j]acridine) and its mononuclear building block. Furthermore, detailed photocatalytic activity measurements of RutpacPd are presented. The introduction of the tpac-ligand into the molecular framework offers a potential route to reduce the impact of water as compared to the well-studied class of RutpphzPd (with tpphz = tetrapyrido[3,2-a:2′,3′-c:3″,2″-h:2?,3?-j]phenazine) complexes. The distinct impact of water on the electron-transfer processes in tpphz-ligands stems from the possibility of water to form hydrogen bonds to the phenazine nitrogen atoms and will potentially reduced when replacing the phenazine by the acridine unit. The effect of this structural variation on the catalytic properties and the underlying ultrafast intramolecular charge transfer behavior will be discussed in detail. 相似文献