全文获取类型
收费全文 | 102795篇 |
免费 | 1323篇 |
国内免费 | 529篇 |
专业分类
化学 | 40856篇 |
晶体学 | 1032篇 |
力学 | 7547篇 |
综合类 | 1篇 |
数学 | 33967篇 |
物理学 | 21244篇 |
出版年
2023年 | 139篇 |
2022年 | 110篇 |
2021年 | 423篇 |
2020年 | 432篇 |
2019年 | 449篇 |
2018年 | 10653篇 |
2017年 | 10477篇 |
2016年 | 6701篇 |
2015年 | 1453篇 |
2014年 | 1071篇 |
2013年 | 1777篇 |
2012年 | 5651篇 |
2011年 | 12450篇 |
2010年 | 6825篇 |
2009年 | 7087篇 |
2008年 | 8232篇 |
2007年 | 10273篇 |
2006年 | 1724篇 |
2005年 | 2697篇 |
2004年 | 2751篇 |
2003年 | 2891篇 |
2002年 | 1825篇 |
2001年 | 846篇 |
2000年 | 780篇 |
1999年 | 423篇 |
1998年 | 384篇 |
1997年 | 382篇 |
1996年 | 488篇 |
1995年 | 362篇 |
1994年 | 343篇 |
1993年 | 364篇 |
1992年 | 311篇 |
1991年 | 263篇 |
1990年 | 196篇 |
1989年 | 193篇 |
1988年 | 197篇 |
1987年 | 174篇 |
1986年 | 149篇 |
1985年 | 212篇 |
1984年 | 153篇 |
1983年 | 131篇 |
1982年 | 162篇 |
1981年 | 126篇 |
1980年 | 125篇 |
1979年 | 105篇 |
1978年 | 114篇 |
1977年 | 103篇 |
1976年 | 110篇 |
1975年 | 117篇 |
1973年 | 127篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
Chong Saehwa Riley Brian J. Nienhuis Emily T. Lee Dongjin McCloy John S. 《Journal of chemical crystallography》2021,51(3):293-300
Journal of Chemical Crystallography - Four different rare-earth oxyapatites of Ca2RE8(SiO4)6O2 (RE?=?Pr, Tb, Ho, Tm) were synthesized using a solution-based method followed by drying,... 相似文献
2.
Science China Mathematics - We study the toric degeneration of Weyl group translated Schubert divisors of a partial flag variety $$F{\ell _{{n_1}, \ldots,{n_k};n}}$$ via Gelfand-Cetlin polytopes.... 相似文献
3.
4.
Pirozerskii A. L. Charnaya E. V. Lee M. K. Chang L.-J. Naumov S. V. Domozhirova A. N. Marchenkov V. V. 《Physics of the Solid State》2022,64(2):80-84
Physics of the Solid State - The discovery of extreme magnetoresistance (MR) in nonmagnetic materials attracted attention to WTe2 semimetal. We studied MR in a single crystal of tungsten... 相似文献
5.
Ryu Hoon-Hee Lee Soo-Been Sun Yang-Kook 《Journal of Solid State Electrochemistry》2022,26(9):2097-2105
Journal of Solid State Electrochemistry - Preparing a high-performance Ni-rich single-crystal cathode for Li-ion batteries is challenging. This is because calcination must be performed at a high... 相似文献
6.
Aysun apc Mlanie M. Lorion Hui Wang Nina Simon Maria Leidenberger Mariana C. BorgesSilva Diogo R. M. Moreira Yongping Zhu Yuqing Meng Jia Yun Chen Yew Mun Lee Oliver Friedrich Barbara Kappes Jigang Wang Lutz Ackermann Svetlana B. Tsogoeva 《Angewandte Chemie (International ed. in English)》2019,58(37):13161-13161
7.
Park Kyueun Kim Youngjin Lee Kyung Jin 《Journal of Radioanalytical and Nuclear Chemistry》2019,319(2):487-531
Journal of Radioanalytical and Nuclear Chemistry - An extensive series of evaluations have been performed as part of an IAEA coordinated research project to study a set of nuclear reactions that... 相似文献
8.
Gitae Moon Intae Son Chunho Kim Chi Hyeong Cho Eunbi Lee Eun Hyoung Bae 《Molecular Crystals and Liquid Crystals》2019,687(1):60-67
AbstractTo enable recent 3D and moving picture applications, liquid crystal displays (LCD) must exhibit fast response and wide viewing angle characteristics. Pre-tilted vertical alignment layers for high-speed LCD were fabricated using bi-functional photoreactive monomers. The monomers can be confined to the polyimide layer and photo-polymerized by UV exposure under voltage. Response characteristics of photo-controlled alignment films according to the structure were investigated. Vertical alignment properties were evaluated using a polarizing optical microscope, and electro-optical characteristics were compared through the voltage-transmittance curve and response time measurement. Faster response speed could be obtained by using photoreactive monomers having a long alkyl chain. 相似文献
9.
Yuliang Zhao 《中国科学:化学(英文版)》2018,61(12):1481-1482
正Living organisms have developed their unique strategies during the natural evolution for building hard tissues with minerals, including silica, calcium carbonate, calcium phosphate, and ferric oxide [1]. Such biomineralized materials generally have complex hierarchical structures with excellent mechanical properties. Although bioinspired approaches have led to the creation of well-defined synthetic structural materials ranging from micro to macro scales, the rational design of discrete biomimetic structures at the nanoscale remains a grand challenge. 相似文献
10.
JuHong Ge 《Nonlinear dynamics》2018,94(1):87-98
A five-neuron network model with multiple delays is proposed. This paper presents the combined effect of different delays on the dynamics of the proposed network. Pitchfork bifurcation is discussed in detail with the variation of the value of coupled weight or attenuation rate of internal neurons. By analyzing the corresponding characteristic equation, some stable criteria on delay-dependence and delay-independence are derived including multiple delays and coupled weights and the periodic oscillation arises bifurcated from the trivial equilibrium after the network loses its stability. Stable regions on delay-dependence are displayed in the two delayed parameter plane. It is shown that multiple delays can produce stability switching between resting state and periodic activity. Finally, theoretical results are justified by providing two illustrative examples. 相似文献