全文获取类型
收费全文 | 1144篇 |
免费 | 51篇 |
国内免费 | 13篇 |
专业分类
化学 | 741篇 |
晶体学 | 1篇 |
力学 | 13篇 |
数学 | 259篇 |
物理学 | 194篇 |
出版年
2023年 | 12篇 |
2022年 | 10篇 |
2021年 | 19篇 |
2020年 | 23篇 |
2019年 | 29篇 |
2018年 | 29篇 |
2017年 | 18篇 |
2016年 | 42篇 |
2015年 | 26篇 |
2014年 | 43篇 |
2013年 | 66篇 |
2012年 | 84篇 |
2011年 | 84篇 |
2010年 | 63篇 |
2009年 | 59篇 |
2008年 | 73篇 |
2007年 | 74篇 |
2006年 | 59篇 |
2005年 | 73篇 |
2004年 | 58篇 |
2003年 | 33篇 |
2002年 | 46篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 22篇 |
1998年 | 14篇 |
1997年 | 7篇 |
1996年 | 21篇 |
1995年 | 10篇 |
1994年 | 16篇 |
1993年 | 7篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 6篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1966年 | 1篇 |
1931年 | 1篇 |
1930年 | 1篇 |
1926年 | 1篇 |
1922年 | 1篇 |
排序方式: 共有1208条查询结果,搜索用时 15 毫秒
151.
Nikolai A. Ustynyuk Oleg V. Gusev Lyudmila N. Novikova Mikhail G. Peterleitner Larisa I. Denisovich Tat’yana A. Peganova Oleg V. Semeikin Dmitry A. Valyaev 《Journal of Solid State Electrochemistry》2007,11(12):1621-1634
In this review, redox-induced reactions of π- and σ,π-complexes leading to the selective formation (or cleavage) of C–H, C–C,
and C–O bonds have been summarized. To illustrate the synthetic potential of such methodology, the following representative
reactions studied in our group are discussed: (1) oxidatively induced hydrogen elimination from “open” cyclic diene and dienyl
complexes resulting in formation of “closed” dienyl and arene complexes, respectively; (2) reductive activation of C–H bonds
in diene, vinylidene, and carbyne complexes forming new multiple C–C bonds; (3) oxidative dehydrodimerization of vinylidene
complexes into binuclear μ-divinylidene species; and (4) oxidatively induced addition of oxygen nucleophiles to μ-divinylidene
complexes affording cyclic μ-dicarbene derivatives.
Oleg V. Gusev, deceased on October 31. 相似文献
152.
Limiting distributions of the parabolically rescaled solutions of the heat equation with singular non-Gaussian initial data with long-range dependence are described in terms of their multiple stochastic integral representations. 相似文献
153.
This communication reports the first synthesis of a number of deep cavity tetraformyl calix[4]arene macrocycles and their use as key building blocks in the synthesis of a dynamic and the first static non-peptide macrocyclic library. 相似文献
154.
155.
156.
157.
Yuliya A. Volkova Ekaterina M. Budynina Tamara S. Kuznetsova Nikolai S. Zefirov 《Tetrahedron》2008,64(16):3548-3553
A novel approach to acyclic alkyldinitronitronates using nucleophilic opening of epoxides with the trinitromethyl anion is presented. The scope and limitations of this synthetic procedure are presented. A series of highly functionalized 3,3-dinitroisoxazolidines were synthesized as mixtures of diastereomers. 相似文献
158.
Viktor S. Burakov Andrey V. Butsen Volker Brüser Falk Harnisch Pulat Y. Misakov Elena A. Nevar Miriam Rosenbaum Natalie A. Savastenko Nikolai V. Tarasenko 《Journal of nanoparticle research》2008,10(5):881-886
Tungsten carbide nanopowder was prepared via pulsed discharge of bulk tungsten and graphite rods immersed in pure ethanol.
The effect of discharge parameters on the characteristics of final products was investigated. Structural and morphological
characterization of nanopowder was performed by means of X-ray diffraction analysis and transmission electron microscopy.
In order to determine the feasibility of using synthesized material as an electrocatalyst, tungsten carbide nanopowder was
tested for hydrogen evolution. A correlation was found between morphology of nanoparticles, their phase composition and electrocatalytic
activity. 相似文献
159.
Boris N. Khlebtsov Nikolai G. Khlebtsov 《Journal of Quantitative Spectroscopy & Radiative Transfer》2007,107(2):306-314
On the basis of the T-matrix formalism and numerical simulations, we derive an explicit rule for partial multipole contributions to the plasmon resonances of gold nanorods at a fixed or random orientation. The parity of a given spectral resonance number n coincides with the parity of their multipole contributions l, where l is equal to or greater than n, and the total resonance magnitude is determined by the lowest multipole contribution. We also investigate the dependence of multipole plasmons on the size, shape, and orientation of nanorods with respect to the polarized incident light. It is shown that the multipole resonance wavelengths as a function of the aspect ratio divided by the resonance number collapse onto one linear scaling curve. This scaling is explained by using the plasmon standing wave concept introduced by Schider et al. [Plasmon dispersion relation of Au and Ag nanowires. Phys Rev B 2003;68:155427]. 相似文献
160.
We add the multi-particle Bose-Einstein correlations to classical simulations of ultra-relativistic heavy-ion collisions and calculate their influence on various observables such as multiplicity distributions, single-particle spectra and two-particle correlation functions. We demonstrate the method using simulations of ultra-relativistic heavy-ion collisions within a parton-string model for different systems of colliding nuclei at initial energy 200 AGeV. 相似文献