全文获取类型
收费全文 | 188篇 |
免费 | 0篇 |
专业分类
化学 | 151篇 |
力学 | 1篇 |
数学 | 6篇 |
物理学 | 30篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2018年 | 4篇 |
2014年 | 2篇 |
2013年 | 9篇 |
2012年 | 11篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2007年 | 2篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2000年 | 4篇 |
1999年 | 11篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 2篇 |
1967年 | 3篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1912年 | 1篇 |
1890年 | 1篇 |
1881年 | 4篇 |
排序方式: 共有188条查询结果,搜索用时 703 毫秒
11.
12.
Stable polar oxide surfaces must be simultaneously electrostatically compensated and in thermodynamic equilibrium with the environment. As a paradigm, the MgO(111)-p(2x2) reconstructed surface is shown to involve combinations of Mg-covered terminations with peculiar insulating electronic structure, favored in O-poor conditions, and the O-terminated octopole, stabler in more O-rich environments. Such a picture, which could not have been foreseen by either experiments or simulations separately, goes beyond the Wolf model and reconciles the theory with the experimental data taken in variable thermodynamic conditions. 相似文献
13.
Youte JJ Barbier D Al-Mourabit A Gnecco D Marazano C 《The Journal of organic chemistry》2004,69(8):2737-2740
Potassium ferricyanide oxidation of salt 1 gave isoquinolinone 7 whose treatment with Grignard reagents resulted in a high-yield formation of substituted isoquinolinium salts 5. The selectivity of the reduction of these salts to give derivatives 6 has been studied. Particularly good selectivities (82-84%) were observed when R is a benzylic group. On the basis of these results, a practical and enantioselective synthesis of the natural alkaloid (-)-argemonine is presented. 相似文献
14.
J. Mane Mane C. S. Cojocaru A. Barbier J.‐P. Deville B. Jean T. H. Metzger B. Thiodjio Sendja F. Le Normand 《固体物理学:研究快报》2007,1(3):122-124
We report a quantitative Grazing Incidence Small Angle X‐ray Scattering (GISAXS) study of a dense film of mutually oriented carbon nanotubes (CNTs) grown by a catalytically‐activated DC HF CCVD process after dispersion of metallic catalytic (Co) islands on SiO2/Si(100) substrates. The GISAXS pattern analysis is expanded to non‐correlated surface science systems and is based on CNTs density, characteristic lengths, atomic Co dispersion throughout the CNTs and roughnesses of uncorrelated particles. The results are closely compared to SEM and TEM observations. The GISAXS patterns, even dominated by envelope features of disordered objects, provide significant complementary quantitative data about CNTs films. The results underline that cobalt continuously fills the nanotube in the course of the growth and that the CNTs experience a large tendency toward mutual alignment. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
15.
Gilles Casano Maxime Robin Pascale Barbier Vincent Peyrot Robert Faure 《Magnetic resonance in chemistry : MRC》2010,48(9):738-744
The complete 1H and 13C NMR assignment of 9 acetamidochalcones, 18 acetamidoflavones, 18 aminoflavones, 9 acetamidoflavonols and 9 aminoflavonols has been performed using one‐ and two‐dimensional NMR techniques including COSY, HMQC and HMBC experiments. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
16.
Background
Protein kinase C interacting protein (PKCI/HINT1) is a small protein belonging to the histidine triad (HIT) family proteins. Its brain immunoreactivity is located in neurons and neuronal processes. PKCI/HINT1 gene knockout (KO) mice display hyper-locomotion in response to D-amphetamine which is considered a positive symptom of schizophrenia in animal models. Postmortem studies identified PKCI/HINT1 as a candidate molecule for schizophrenia and bipolar disorder. We investigated the hypothesis that the PKCI/HINT1 gene may play an important role in regulating mood function in the CNS. We submitted PKCI/HINT1 KO mice and their wild type (WT) littermates to behavioral tests used to study anti-depressant, anxiety like behaviors, and goal-oriented behavior. Additionally, as many mood disorders coincide with modifications of hypothalamic-pituitary-adrenal (HPA) axis function, we assessed the HPA activity through measurement of plasma corticosterone levels. 相似文献17.
18.
Guichard E. Barbier Wolfbauer und C. Weigelt 《Fresenius' Journal of Analytical Chemistry》1881,20(1):550-551
Ohne Zusammenfassung 相似文献
19.
20.
A. Abduzhamilov S. A. Azimov L. Barbier R. A. Bondarenko L. P. Chernova M. M. Chernyavsky S. I. Gadzhieva K. G. Gulamov R. Holynski W. V. Jones N. Litvinenko N. S. Lukicheva D. Mirkhodzhaeva V. Sh. Navotny G. I. Orlova E. A. Ravvina N. Sh. Saidkhanov N. A. Salmanova L. N. Svechnikova M. I. Tretyakova J. P. Wefel W. Wolter B. Wosiek K. Wozniak 《Zeitschrift fur Physik C Particles and Fields》1988,40(1):1-11
Data on angular distributions of heavily ionizing and shower particles in incoherent protonnucleus collisions in emulsion at 800 GeV are reported and discussed in details. Dependence of angular distributions on the mass number of a target nucleus and on the multiplicity of charged particles is investigated. The data presented are systematically compared with results of emulsion experiments at lower energies and with predictions of the Lund Monte Carlo model FRITIOF. 相似文献