全文获取类型
收费全文 | 716篇 |
免费 | 12篇 |
专业分类
化学 | 417篇 |
晶体学 | 1篇 |
力学 | 5篇 |
数学 | 38篇 |
物理学 | 267篇 |
出版年
2016年 | 7篇 |
2015年 | 9篇 |
2014年 | 16篇 |
2013年 | 28篇 |
2012年 | 23篇 |
2011年 | 19篇 |
2010年 | 20篇 |
2009年 | 9篇 |
2008年 | 19篇 |
2007年 | 25篇 |
2006年 | 30篇 |
2005年 | 38篇 |
2004年 | 20篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 9篇 |
2000年 | 9篇 |
1999年 | 16篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1996年 | 13篇 |
1995年 | 21篇 |
1994年 | 19篇 |
1993年 | 22篇 |
1992年 | 22篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 11篇 |
1988年 | 14篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1981年 | 9篇 |
1980年 | 12篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 8篇 |
1976年 | 10篇 |
1975年 | 6篇 |
1974年 | 13篇 |
1973年 | 26篇 |
1972年 | 10篇 |
1971年 | 12篇 |
1970年 | 5篇 |
1969年 | 10篇 |
1968年 | 9篇 |
1967年 | 10篇 |
1925年 | 5篇 |
排序方式: 共有728条查询结果,搜索用时 15 毫秒
51.
52.
Zirbs R Kienberger F Hinterdorfer P Binder WH 《Langmuir : the ACS journal of surfaces and colloids》2005,21(18):8414-8421
We have developed a new concept to effect nanoparticle binding on surfaces by use of directed, specific molecular interactions. Hamilton-type receptors displaying a binding strength of approximately 10(5) M(-)(1) were covalently fixed onto self-assembled monolayers via Sharpless-type "click" reactions, thus representing an efficient method to control the densities of ligands over a range from low to complete surface coverage. Au nanoparticles covered with the matching barbituric acid receptors bound with high selectivity onto this surface by a self-assembly process mediated by multiple hydrogen bonds. The binding process was investigated with atomic force microscopy. Moderate control of particle density was achieved by controlling the receptor density on the self-assembled monolayer surface. The method opens a general approach to nanoparticle and small object binding onto patterned surfaces. 相似文献
53.
H. Binder I. Duttlinger H. Loos K. Locke A. Pfitzner H.-J. Flad A. Savin M. Kohout 《无机化学与普通化学杂志》1995,621(3):400-404
Synthesis and Vibrational Spectroscopic Investigation of [H3B? Se? Se? BH3]2? and [H3B-μ2-Se(B2H5)]? Crystal Structure and Theoretical Investigation of the Molecular Structure of [H3B-μ2-Se(B2H5)]? M2[H3B? Se? Se? BH3] 1 is produced by the reaction between elemental selenium and MBH4 (1 : 1) in triglyme (diglyme), under dehydrogenation. 1 reacts with an excess of B2H6 to give M[H3B-μ2-Se(B2H5)] 2 which is also formed in the reaction of THF · BH3 with 1 . These reactions proceed under cleavage of the Se? Se bond and hydrogen evolution. [(C6H5)4]Br reacts with Na · 2 to form [(C6H5)4P] · 2 which crystallizes in the tetragonal space group I4 (Nr. 82). An X-ray structure determination failed because of disordering of the cation and anion. 11B, 77Se NMR shifts and 1J(11B1H) coupling constants as well as IR- and Raman spectroscopic investigations convey further structural information. Structural data of 2 have been calculated by SCF methods. The anion of 2 may be viewed either as an adduct of Se with B3H8?, or as a bridge substituted selena derivative of B2H6. 相似文献
54.
Monte Carlo studies of symmetrical polymer mixturesAB, modelled by selfavoiding walks withN
A
=N
B
=N steps on a simple cubic lattice, are presented for arbitrary concentrations of vacancies
v
in the range from
v
=0.2 to
v
=0.8 and chain lengthsN64. We obtained the phase diagrams and the equation of state for three choices of the ratio /
AB
( being the energy between monomers of the same kind,
AB
being the energy between different monomers). Flory-Huggins theory provides only a qualitative understanding of these results. If the equation of state is fitted with an effective Flory-Huggins parameter
eff
, the latter turns out to be strongly dependent on both concentration and temperature.Contributed paper delivered at the Tagung der Deutschen Physikalischen Gesellschaft, Fachausschuß Polymerphysik, Berlin, March 30–April 3, 1987. 相似文献
55.
Monte Carlo simulations of the Edwards-Anderson-Ising spin glass with Gaussian distribution of nearest-neighbor exchange forces in four and five dimensions are performed to check the speculation thatd=4 is the lower critical dimensionality. In contrast to this expectation we find no qualitative difference at all to the results in two and three dimensions. We still find that on not too long time-scales there is an apparently rather well defined freezing temperatureT
f
, where the susceptibility has a cusp, and belowT
f
nonzero order parametersq, can be found as ford=2, 3. But even ford=5 the decay of the Edwards-Anderson order parameter belowT
f
is found to be consistent with a logarithmic variation over several decades of observation time. The possible interpretations of this result are discussed. Our data thus suggest that either there is no equilibrium phase transition in all these dimensions, or more likely that a phase transition exists for 2d5 but the properties of the ordered phase may be rather peculiar.Sonderforschungsbereich 125 Aachen-Jülich-Köln 相似文献
56.
Dr. Alexander Hoffmann Cooper Citek Dr. Stephan Binder Arne Goos Prof. Dr. Michael Rübhausen Oliver Troeppner Prof. Dr. Ivana Ivanović‐Burmazović Prof. Dr. Erik C. Wasinger Prof. Dr. T. Daniel P. Stack Prof. Dr. Sonja Herres‐Pawlis 《Angewandte Chemie (International ed. in English)》2013,52(20):5398-5401
57.
58.
59.