全文获取类型
收费全文 | 369996篇 |
免费 | 5445篇 |
国内免费 | 1915篇 |
专业分类
化学 | 204366篇 |
晶体学 | 4496篇 |
力学 | 15628篇 |
综合类 | 66篇 |
数学 | 42935篇 |
物理学 | 109865篇 |
出版年
2020年 | 2914篇 |
2019年 | 3075篇 |
2018年 | 3733篇 |
2017年 | 3807篇 |
2016年 | 6181篇 |
2015年 | 4446篇 |
2014年 | 6068篇 |
2013年 | 16294篇 |
2012年 | 13624篇 |
2011年 | 16567篇 |
2010年 | 11089篇 |
2009年 | 11037篇 |
2008年 | 15348篇 |
2007年 | 15511篇 |
2006年 | 14704篇 |
2005年 | 13541篇 |
2004年 | 12115篇 |
2003年 | 10599篇 |
2002年 | 10388篇 |
2001年 | 11591篇 |
2000年 | 8893篇 |
1999年 | 6059篇 |
1998年 | 4817篇 |
1997年 | 4891篇 |
1996年 | 4860篇 |
1995年 | 4533篇 |
1994年 | 4519篇 |
1993年 | 4276篇 |
1992年 | 4760篇 |
1991年 | 4782篇 |
1990年 | 4384篇 |
1989年 | 4281篇 |
1988年 | 4258篇 |
1987年 | 4118篇 |
1986年 | 4056篇 |
1985年 | 5657篇 |
1984年 | 5710篇 |
1983年 | 4693篇 |
1982年 | 5100篇 |
1981年 | 4796篇 |
1980年 | 4538篇 |
1979年 | 4660篇 |
1978年 | 4958篇 |
1977年 | 4951篇 |
1976年 | 4914篇 |
1975年 | 4649篇 |
1974年 | 4667篇 |
1973年 | 4791篇 |
1972年 | 3360篇 |
1971年 | 2583篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Reutova O. V. Belokoneva E. L. Dimitrova O. V. Volkov A. S. 《Crystallography Reports》2022,67(7):1122-1126
Crystallography Reports - Fluoride crystals K2(Ta0.9I0.1)F7 (sp. gr. Р21/c) complementary to the K2TaF7 and K2NbF7 fluoride family have been obtained by hydrothermal synthesis. Their... 相似文献
2.
Ramón Fernández-Ruiz 《X射线光谱测定》2022,51(3):279-293
This work describes the basic principles of Total-reflection X-Ray Fluorescence (TXRF) spectrometry and some of its most outstanding applications for investigating metal traces, mainly in biological and biomedical samples. TXRF is an analytical technique that combines the versatility of elemental analysis by X-ray energy dispersion with a low detection limit in the order of picograms of absolute mass or a few ppb (μg L−1) as concentration. The microanalytical capacity of TXRF allows the study of small sample quantities. The TXRF can perform qualitative and mass ratio analyses of the elements present in a sample of only a few hundred nanograms. These properties are of great importance in the research of metal traces in biological systems, as they allow fast, precise, and accurate characterisation of the elemental fingerprint at trace level. Its successful application in studies of the coordination kinetics of new platinum-based antitumor drugs with DNA, its application in the study profile of the metal in healthy and cancerous human tissues, or even its application in the study of the processes of metal diffusion through cell membranes are just a few examples of TXRF capabilities in the biomedical sciences. This brief review's main objective is to provide an overview of the physical principles and possibilities of TXRF spectrometry. It also highlights some of the most outstanding applications that have been developed so far, mainly in the biological field, so that the reader can evaluate their potential applications. 相似文献
3.
Zlámalová M. Pitňa Lásková B. Vinarčíková M. Zukalová M. Kavan L. 《Journal of Solid State Electrochemistry》2022,26(3):639-647
Journal of Solid State Electrochemistry - The addition of nanocrystalline titanium dioxide (P90) to a cathode of Li/S cell enhances its voltammetric charge capacity by 19%, from which only a small... 相似文献
4.
Potekaev A. I. Klopotov A. A. Trishkina L. I. Cherkasova T. V. Kulagina V. V. Tazin I. D. 《Russian Physics Journal》2022,65(1):114-122
Russian Physics Journal - The results of a study of the dislocation structure evolution in polycrystals of homogeneous solid solutions in low-stability states in Cu-Mn-based alloys with FCC crystal... 相似文献
5.
Russian Physics Journal - Aiming at problems of low probability of interception and poor anti-jamming performance of the multi-output radar, the numerical simulation based on a chaos optimization... 相似文献
6.
Ribeiro Sabrina Dias Meneguin Andria Bagliotti Barud Hernane da Silva Silva Jhonatan Miguel Oliveira Rafael L. Asuno Rosana Maria Nascimento de Tormin Thiago Faria Muoz Rodrigo Alejandro Abarza Filho Guimes Rodrigues Ribeiro Clovis Augusto 《Journal of Thermal Analysis and Calorimetry》2022,147(13):7265-7275
Journal of Thermal Analysis and Calorimetry - Cellophane film production generates cellulosic residues from scraps, edges, and low-quality films. In this work, cellophane was used as a raw material... 相似文献
7.
JETP Letters - The mechanical characteristics of diamond-like films, such as Dn21.8, Dn27.8, and Dn29.4 moiré diamanes, formed by the hydrogenation of graphene layers twisted at an angle of... 相似文献
8.
Fernández Julio R. Gallego Inés Jiménez-Losada Andrés Ordóñez Manuel 《Fuzzy Optimization and Decision Making》2022,21(4):531-551
Fuzzy Optimization and Decision Making - Cost-allocation problems in a fixed network are concerned with distributing the costs for use by a group of clients who cooperate in order to reduce such... 相似文献
9.
Sirotinkin V. P. Podzorova L. I. Mikhailina N. A. Pen’kova O. I. 《Crystallography Reports》2022,67(2):278-285
Crystallography Reports - A surface structural analysis of two ceramic samples of zirconium oxide (ZrO2) sintered at 1550°C, stabilized in the tetragonal form, before and after hydrothermal... 相似文献
10.
Mathematical Notes - The paper deals with a general problem of convex stochastic optimization in a space of small dimension (for example, 100 variables). It is known that for deterministic problems... 相似文献