全文获取类型
收费全文 | 403篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
化学 | 231篇 |
晶体学 | 5篇 |
力学 | 7篇 |
数学 | 26篇 |
物理学 | 141篇 |
出版年
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2015年 | 5篇 |
2014年 | 5篇 |
2013年 | 12篇 |
2012年 | 11篇 |
2011年 | 24篇 |
2010年 | 16篇 |
2009年 | 11篇 |
2008年 | 22篇 |
2007年 | 15篇 |
2006年 | 13篇 |
2005年 | 22篇 |
2004年 | 16篇 |
2003年 | 21篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 12篇 |
1999年 | 8篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 11篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1985年 | 4篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1974年 | 3篇 |
1973年 | 5篇 |
1972年 | 2篇 |
1944年 | 2篇 |
1943年 | 2篇 |
1942年 | 2篇 |
1941年 | 2篇 |
1934年 | 2篇 |
1919年 | 2篇 |
1908年 | 2篇 |
1905年 | 3篇 |
1903年 | 2篇 |
1888年 | 2篇 |
排序方式: 共有410条查询结果,搜索用时 15 毫秒
81.
82.
Ozalp-Yaman S de Hoog P Amadei G Pitié M Gamez P Dewelle J Mijatovic T Meunier B Kiss R Reedijk J 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(11):3418-3426
The synthesis and biological activity of three heteronuclear platinum-copper complexes based on 3-Clip-Phen are reported. These rigid complexes have been designed to alter the intrinsic mechanism of action of both the platinum moiety and the Cu(3-Clip-Phen) unit. The platinum centers of two of these complexes are coordinated to a 3-Clip-Phen moiety, an ammine ligand and two chlorides, which are either cis or trans to each other. The third complex comprises two 3-Clip-Phen units and two chloride ligands bound in a trans fashion to the platinum ion. DNA-cleavage experiments show that the complexes are highly efficient nuclease agents. In addition, a markedly difference in their aptitude to perform direct double-strand cleavage is observed, which appears to be strongly related to the ability of the platinum unit to coordinate to DNA. Indeed, complex 6 is unable to coordinate to DNA, which is reflected by its incapability to carry out double-strand breaks. Nonetheless, this complex exhibits efficient DNA-cleavage activity, and its cytotoxicity is high for several cell lines. Complex 6 shows better antiproliferate activity than both cisplatin and Cu(3-Clip-Phen) toward most cancer cell lines. Furthermore, the cytotoxicity observed for 1 is for most cell lines close to that of cisplatin, or even better. Cu(3-Clip-Phen) induces very low cytotoxic effects, but a marked migratory activity. Complex 6 presents DNA-cleavage properties comparable to the one of Cu(3-Clip-Phen), but it does not show any migratory activity. Interestingly, both Cu(3-Clip-Phen) and 6 induces vacuolisation processes in the cell in contrast to complex 1 and cisplatin. Thus, the four complexes cisplatin tested, Cu(3-Clip-Phen), 1 and 6 stimulate different cellular responses. 相似文献
83.
We describe the occurrence of computational artifacts when the principal layer method is used in combination with the cluster approximation for the calculation of electronic transport properties of nanostructures. For a one-dimensional gold chain, we observe an unphysical band in the band structure. The artificial band persists for large principal layers and for large buffer sizes. We demonstrate that the assumption of equality between Hamiltonian elements of neighboring layers is no longer valid and that a discontinuity is introduced in the potential at the layer transition. The effect depends on the basis set. When periodic boundary conditions are imposed and the k-space sampling is converged, the discontinuity disappears and the principal layer method can be correctly applied by using a linear combination of atomic orbitals as basis set. 相似文献
84.
This tutorial review devoted to ligand chemistry deals with the design and properties of ferrocenyl polyphosphines, an original class of multidentate ligands. The development of a varied library of ferrocenyl tetra-, tri- and diphosphine ligands is reviewed. The multidentate nature of these species has led to unique spectroscopic and catalytic properties, in which the spatial proximity of phosphorus atoms is crucial. Regarding their catalytic applications, the key issues of catalyst longevity and ultralow catalyst loadings are discussed. Another part is concerned with fundamental advances gained in physical chemistry for structure elucidation by the study of the intriguing "through-space" NMR spin-spin J couplings existing within several of these polyphosphines. 相似文献
85.
Dixon IM Lopez F Tejera AM Estève JP Blasco MA Pratviel G Meunier B 《Journal of the American Chemical Society》2007,129(6):1502-1503
86.
W. Seidel M. Bravin M. Bruckmayer C. Bucci S. Cooper P. DiStefano F. V. Feilitzsch T. Frank J. Jochum R. Keeling H. Kraus M. Loidl J. Marchese O. Meier P. Meunier U. Nagel D. Pergolesi F. Pröbst Y. Ramachers J. Schnagl I. Sergeyev M. Sisti L. Stodolsky S. Uchaikin L. Zerle 《Physics of Atomic Nuclei》2000,63(7):1242-1248
We discuss the short-and long-term perspectives of the CRESST (Cryogenic Rare Event Search using Superconducting Thermometers) project and present the current status of the experiment and new results concerning detector development. In the search for elementary particle dark matter, CRESST is presently the most advanced deep underground, low-background, cryogenic facility. The basic technique involved is to search for WIMPs (Weakly Interacting Massive Particles) by the measurement of nonthermal phonons, as created by WIMP-induced nuclear recoils. Combined with our newly developed method for the simultaneous measurement of scintillation light, strong background discrimination is possible, resulting in a substantial increase in WIMP detection sensitivity. This will allow a test of the reported positive evidence for a WIMP signal by the DAMA Collaboration in the near future. In the long term, the present CRESST setup permits the installation of a detector mass up to 100 kg. In contrast to other projects, CRESST technology allows the employment of a large variety of detection materials. This offers a powerful tool in establishing a WIMP signal and in investigating WIMP properties in the event of a positive signal. 相似文献
87.
Received: 9 November 1998 / Accepted: 25 November 1998 相似文献
88.
89.
Fabrice Domingues Dos Santos Pascale Fabre Xavier Drujon Gilles Meunier Ludwik Leibler 《Journal of Polymer Science.Polymer Physics》2000,38(23):2989-3000
Structured latexes provide a promising route to hard coatings without the use of coalescing aids. We studied the thermomechanical properties of films from structured soft‐core/hard‐shell hydrophobic latexes. We found that the mechanical properties of these films were closely related to their very particular organization. When the rigid phase was continuous, whatever its volume fraction, the films exhibited a high elastic modulus. An analysis of the viscoelastic properties of the films provided a good method for obtaining information about the interphase between the hard shell and soft core of the latex particles. By varying the film structure through annealing or the particle composition (core/shell ratio, core crosslinking, etc.), we were able to tune the mechanical properties of the films. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2989–3000, 2000 相似文献
90.
Judith C. Gallucci Sbastien Gentil Nadine Pirio Philippe Meunier Fabrice Gallou Leo A. Paquette 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(2):m67-m69
Transmetallation of the dilithium salt of (3,5‐dimethyphenylamino)(isodicyclopentadienyl)dimethylsilane by treatment with zirconium tetrachloride in a 2:1 ratio leads to the substitution of all four chloride ligands. With the applied stoichiometry, the title complex, [Zr(C20H25NSi)2]·C4H10O, was obtained and crystallized from diethyl ether. X‐ray diffraction characterization showed that both isodicyclopentadienyl ligands (alternatively called 4,5,6,7‐tetrahydro‐4,7‐methano‐1H‐indene) are complexed to the metal on their exo face in a completely stereoselective manner and that they are η5‐bonded to the Zr atom. 相似文献