全文获取类型
收费全文 | 333278篇 |
免费 | 7951篇 |
国内免费 | 4213篇 |
专业分类
化学 | 184878篇 |
晶体学 | 3776篇 |
力学 | 14191篇 |
综合类 | 241篇 |
数学 | 39394篇 |
物理学 | 102962篇 |
出版年
2021年 | 2242篇 |
2020年 | 2867篇 |
2019年 | 2865篇 |
2018年 | 2744篇 |
2017年 | 2608篇 |
2016年 | 4944篇 |
2015年 | 4345篇 |
2014年 | 5732篇 |
2013年 | 15816篇 |
2012年 | 12882篇 |
2011年 | 15723篇 |
2010年 | 9959篇 |
2009年 | 9908篇 |
2008年 | 14164篇 |
2007年 | 14248篇 |
2006年 | 13674篇 |
2005年 | 12477篇 |
2004年 | 11083篇 |
2003年 | 9493篇 |
2002年 | 8718篇 |
2001年 | 10299篇 |
2000年 | 7642篇 |
1999年 | 6018篇 |
1998年 | 4738篇 |
1997年 | 4702篇 |
1996年 | 4710篇 |
1995年 | 4598篇 |
1994年 | 4344篇 |
1993年 | 4143篇 |
1992年 | 4610篇 |
1991年 | 4443篇 |
1990年 | 4097篇 |
1989年 | 3895篇 |
1988年 | 4175篇 |
1987年 | 3790篇 |
1986年 | 3721篇 |
1985年 | 5391篇 |
1984年 | 5418篇 |
1983年 | 4356篇 |
1982年 | 4732篇 |
1981年 | 4776篇 |
1980年 | 4511篇 |
1979年 | 4661篇 |
1978年 | 4645篇 |
1977年 | 4611篇 |
1976年 | 4589篇 |
1975年 | 4474篇 |
1974年 | 4349篇 |
1973年 | 4518篇 |
1972年 | 2549篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
Pomogaev V. A. Lee H. J. Goh E. Tchaikovskaya O. N. Kononov A. I. Avramov P. V. 《Russian Physics Journal》2022,64(11):2076-2081
Russian Physics Journal - Theoretical calculations of excited states in the complexes of gold and silver three-atom nanoclusters with carbon quantum nanodots are performed using the M062X... 相似文献
2.
高端芯片制造所需要的极紫外光刻技术位于我国当前面临35项"卡脖子"关键核心技术之首.高转换效率的极紫外光源是极紫外光刻系统的重要组成部分.本文通过采用双激光脉冲打靶技术实现较强的6.7 nm极紫外光输出.首先,理论计算Gd18+—Gd27+离子最外层4d壳层的4p-4d和4d-4f能级之间跃迁、以及Gd14+—Gd17+离子最外层4f壳层的4d-4f能级之间跃迁对波长为6.7 nm附近极紫外光的贡献.其后开展实验研究,结果表明,随着双脉冲之间延时的逐渐增加,波长为6.7 nm附近的极紫外光辐射强度呈现先减弱、后增加、之后再减弱的变化趋势,在双脉冲延时为100 ns处产生的极紫外光辐射最强.并且,在延时为100 ns处产生的光谱效率最高,相比于单脉冲激光产生的光谱效率提升了33%.此外,发现双激光脉冲打靶技术可以有效地减弱等离子体的自吸收效应,获得的6.7 nm附近极紫外光谱宽度均小于单激光脉冲打靶的情形,且在脉冲延时为30 ns时刻所产生的光谱宽度最窄,约为单独主脉冲产生极紫外光谱宽度的1/3.同时... 相似文献
3.
Ramos Fernando Flores Henoc Camarillo E. Adriana Ledo J. Manuel 《Structural chemistry》2022,33(2):379-388
Structural Chemistry - In the present work, the energy contribution of the sulfur atom in a heterocycle and in a disulfide bond in solid and gas phases was calculated. To achieve this goal,... 相似文献
4.
Heßberger F. P. Antalic S. Giacoppo F. Andel B. Ackermann D. Block M. Heinz S. Khuyagbaatar J. Kojouharov I. Venhart M. 《The European Physical Journal A - Hadrons and Nuclei》2022,58(1):1-18
The European Physical Journal A - The goal of the present paper is twofold. First, a novel expansion many-body method applicable to superfluid open-shell nuclei, the so-called Bogoliubov in-medium... 相似文献
5.
Transport in Porous Media - Membrane filtration of feed containing multiple species of particles is a common process in the industrial setting. In this work, we propose a model for filtration of a... 相似文献
6.
Numerical Algorithms - An inverse central ordering of the nodes is proposed for the Newton interpolation formula. This ordering may improve the stability for certain distributions of nodes. For... 相似文献
7.
Nayak Debasis Dora J. K. Ghosh Sudipto Adyam Venimadhav 《Journal of Solid State Electrochemistry》2022,26(5):1231-1239
Journal of Solid State Electrochemistry - Sodium-ion batteries have emerged as an exciting alternative to commercially dominant lithium-ion batteries for electric vehicles and other applications.... 相似文献
8.
Atopic dermatitis is characterized by leukocyte migration into the skin dermis and typically driven by excessive chemokine production at the site of inflammation. Conventional topical formulations such as gels, creams, and ointments are insufficient for this treatment because of low penetration of drug molecules into the targeted skin tissues. Herein, using a simple, green, sustainable strategy, we have developed novel primary zein nanoparticles embedded in curcumin (Cur) and coated with silk sericin (ZHSCs) for the topical delivery of Cur to penetrate into the dermis and exercise anti-dermatitis effects on the lesion with minimal side-effects. Transdermal delivery experiments and porcine skin fluorescence imaging indicated that ZHSCs facilitate the penetration of Cur across the epidermis layer of skin to reach deep-seated sites. Notably, ZHSCs = 1:0.25 (zein-to-silk sericin mass ratios of 1:0.25) markedly elevated the skin permeability and cumulative turnover of Cur transferred, which were provided a greater than a 3.8-fold increase relative to free Cur. The special nanoparticles of ZHS = 1:0.25 possessed the deepest localization depth and experience a transition of the particle structure and core-shell separation after penetrating into the dermis of skin. In a cell model of dermatitis induced by tumor necrosis factor α/interferon γ co-stimulation, compared with free Cur, Cur-loaded ZHS nanoparticles down-regulated the generation of inflammatory cytokines and chemokines in keratinocytes through suppression of the nuclear translocation of NF-κBp65 and hence exerted an anti-dermatitis effect. This strategy may provide new avenues and direction for the demanding issues of valid topical delivery systems. 相似文献
9.
JETP Letters - The magnetic properties of Co-doped CdS has been investigated by ab initio calculations using the GGA + U approximation. The study reveals the ferromagnetic ordering of Co-doped CdS... 相似文献
10.
Theoretical and Mathematical Physics - An Erratum to this paper has been published: https://doi.org/10.1134/S0040577922060034 相似文献