全文获取类型
收费全文 | 88570篇 |
免费 | 1049篇 |
国内免费 | 755篇 |
专业分类
化学 | 31173篇 |
晶体学 | 867篇 |
力学 | 7116篇 |
综合类 | 40篇 |
数学 | 33478篇 |
物理学 | 17700篇 |
出版年
2023年 | 109篇 |
2022年 | 370篇 |
2021年 | 370篇 |
2020年 | 332篇 |
2019年 | 317篇 |
2018年 | 10599篇 |
2017年 | 10442篇 |
2016年 | 6457篇 |
2015年 | 1251篇 |
2014年 | 690篇 |
2013年 | 1015篇 |
2012年 | 4447篇 |
2011年 | 11233篇 |
2010年 | 6087篇 |
2009年 | 6499篇 |
2008年 | 7210篇 |
2007年 | 9313篇 |
2006年 | 811篇 |
2005年 | 1816篇 |
2004年 | 1923篇 |
2003年 | 2328篇 |
2002年 | 1305篇 |
2001年 | 446篇 |
2000年 | 426篇 |
1999年 | 306篇 |
1998年 | 291篇 |
1997年 | 241篇 |
1996年 | 320篇 |
1995年 | 218篇 |
1994年 | 188篇 |
1993年 | 201篇 |
1992年 | 136篇 |
1991年 | 126篇 |
1990年 | 117篇 |
1989年 | 118篇 |
1988年 | 99篇 |
1987年 | 103篇 |
1986年 | 93篇 |
1985年 | 123篇 |
1984年 | 122篇 |
1983年 | 96篇 |
1982年 | 109篇 |
1981年 | 78篇 |
1980年 | 100篇 |
1979年 | 107篇 |
1978年 | 74篇 |
1977年 | 58篇 |
1976年 | 59篇 |
1975年 | 48篇 |
1973年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Mesoscopic modeling at the pore scale offers great promise in exploring the underlying structure transport performance of flow through porous media. The present work studies the fluid flow subjected to capillarity-induced resonance in porous media characterized by different porous structure and wettability. The effects of porosity and wettability on the displacement behavior of the fluid flow through porous media are discussed. The results are presented in the form of temporal evolution of percentage saturation and displacement of the fluid front through porous media. The present study reveals that the vibration in the form of acoustic excitation could be significant in the mobilization of fluid through the porous media. The dependence of displacement of the fluid on physicochemical parameters like wettability of the surface, frequency along with the porosity is analyzed. It was observed that the mean displacement of the fluid is more in the case of invading fluid with wetting phase where the driving force strength is not so dominant. 相似文献
2.
3.
4.
5.
6.
7.
Functional Binding Surface of a β‐Hairpin VEGF Receptor Targeting Peptide Determined by NMR Spectroscopy in Living Cells 下载免费PDF全文
Dr. Donatella Diana Anna Russomanno Dr. Lucia De Rosa Dr. Rossella Di Stasi Dr. Domenica Capasso Dr. Sonia Di Gaetano Dr. Alessandra Romanelli Dr. Luigi Russo Dr. Luca D. D'Andrea Prof. Roberto Fattorusso 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(1):91-95
In this study, the functional interaction of HPLW peptide with VEGFR2 (Vascular Endothelial Growth Factor Receptor 2) was determined by using fast 15N‐edited NMR spectroscopic experiments. To this aim, 15N uniformly labelled HPLW has been added to Porcine Aortic Endothelial Cells. The acquisition of isotope‐edited NMR spectroscopic experiments, including 15N relaxation measurements, allowed a precise characterization of the in‐cell HPLW epitope recognized by VEGFR2. 相似文献
8.
9.
Particularly-shaped silver nanostructures are successfully applied in many scientific fields, such as nanotechnology, catalysis, (nano)engineering, optoelectronics, and sensing. In recent years, the production of shape-controlled silver-based nanostructures and the knowledge around this topic has grown significantly. Hence, on the basis of the most recent results reported in the literature, a critical analysis around the driving forces behind the synthesis of such nanostructures are proposed herein, pointing out the important role of surface-regulating agents in driving crystalline growth by favoring (or opposing) development along specific directions. Additionally, growth mechanisms of the different morphologies considered here are discussed in depth, and critical points highlighted. 相似文献
10.
S. V. Panin I. V. Vlasov V. P. Sergeev B. B. Ovechkin P. O. Marushchak Sunder Ramasubbu P. S. Lyubutin V. V. Titkov 《Physical Mesomechanics》2015,18(3):261-272
The structure and properties of 12Cr1MoV steel irradiated with a zirconium ion beam were studied by optical microscopy, scanning electron microscopy, and micro- and nanoindentation. It is shown that the modification covers the entire cross-section of the irradiated specimens to a depth of 1 mm. The data on irradiation-induced structural changes are used to interpret the changes in mechanical properties of the irradiated specimens under static and cyclic loading. Particular attention is given to analysis of strain estimation by the digital image correlation method. 相似文献