全文获取类型
收费全文 | 43900篇 |
免费 | 6771篇 |
国内免费 | 4520篇 |
专业分类
化学 | 30790篇 |
晶体学 | 468篇 |
力学 | 2615篇 |
综合类 | 294篇 |
数学 | 5391篇 |
物理学 | 15633篇 |
出版年
2024年 | 89篇 |
2023年 | 882篇 |
2022年 | 1465篇 |
2021年 | 1510篇 |
2020年 | 1698篇 |
2019年 | 1558篇 |
2018年 | 1338篇 |
2017年 | 1261篇 |
2016年 | 1934篇 |
2015年 | 1911篇 |
2014年 | 2418篇 |
2013年 | 3051篇 |
2012年 | 3875篇 |
2011年 | 3924篇 |
2010年 | 2646篇 |
2009年 | 2480篇 |
2008年 | 2666篇 |
2007年 | 2331篇 |
2006年 | 2225篇 |
2005年 | 1891篇 |
2004年 | 1609篇 |
2003年 | 1213篇 |
2002年 | 1113篇 |
2001年 | 915篇 |
2000年 | 811篇 |
1999年 | 1000篇 |
1998年 | 813篇 |
1997年 | 726篇 |
1996年 | 808篇 |
1995年 | 707篇 |
1994年 | 643篇 |
1993年 | 524篇 |
1992年 | 505篇 |
1991年 | 419篇 |
1990年 | 390篇 |
1989年 | 280篇 |
1988年 | 244篇 |
1987年 | 219篇 |
1986年 | 168篇 |
1985年 | 170篇 |
1984年 | 147篇 |
1983年 | 129篇 |
1982年 | 88篇 |
1981年 | 69篇 |
1980年 | 51篇 |
1979年 | 35篇 |
1978年 | 28篇 |
1976年 | 29篇 |
1975年 | 33篇 |
1974年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Lin Yu Wu Yeyu Tan Xuecai Wu Jiawen Huang Kejing Mi Yan Ou Panpan Wei Fucun 《Journal of Solid State Electrochemistry》2022,26(4):959-971
Journal of Solid State Electrochemistry - An ultrasensitive “signal-off–on” electrochemiluminescence (ECL) biosensor is constructed based on f1-TiO2/g-C3N4/PDA for thrombin... 相似文献
2.
Yujie Gao Zhiye Qiu Lei Liu Mengmeng Li Bingjie Xu Dan Yu Dongming Qi Jindan Wu 《Journal of polymer science. Part A, Polymer chemistry》2022,60(15):2191-2212
Refractory wounds have always been an important issue to healthcare systems, whose healing process is always delayed by multiple factors, including bacterial infections, chronic inflammation, and excessive exudates, etc. Employing multifunctional wound dressings is recognized as an effective strategy to deal with refractory wounds, which has yielded promising outcomes in recent years. Among these advanced wound dressings, fibrous dressings have gained growing attention due to their unique merits. Such wound dressings have demonstrated great potential in delivering theranostic agents, such as antibacterial agents, anti-inflammatory drugs, growth factors, and diagnostic probes, etc., for the purposes of accelerating wound healing. This paper reviews the development of multifunctional fibrous dressings and their applications in treating refractory wounds. The construction approaches of novel fibrous dressing with capabilities of antibacterial, anti-inflammation, exudate management and diagnosis were also introduced. Furthermore, the existing problems and challenges are also discussed briefly. 相似文献
3.
Hua Saixiang Zhu Huichao Wang Xiao Wu Mingyuan Wu Qingyun Liu Jiuyi Yang Jianjun Zhang Jianan 《Cellulose (London, England)》2022,29(13):7465-7475
Cellulose - Ultraviolet (UV) protective cotton fabric is a convenient and reliable way to protect human body from sunlight. Herein, a polymerizable UV-absorber,... 相似文献
4.
Journal of Optimization Theory and Applications - We distinguish two kinds of piecewise linear functions and provide an interesting representation for a piecewise linear function between two normed... 相似文献
5.
Li Y. Shi W. H. Dong L. M. Xu S. X. Huang H. J. Yin J. R. 《Journal of Applied Spectroscopy》2022,89(3):534-541
Journal of Applied Spectroscopy - Sr3B2O6:Dy3+, Eu3+ single-matrix white-light-emitting materials are prepared using the high-temperature solid-state method. The microstructure, emission spectrum,... 相似文献
6.
Liu Jingze Fei Qingguo Wu Shaoqing Tang Zhenhuan Zhang Dahai 《Nonlinear dynamics》2021,106(3):1869-1890
Nonlinear Dynamics - Rolling bearing and squeeze film damper will introduce structural nonlinearity into the dynamic model of aeroengine. Rubbing will occur due to the clearance reduction design of... 相似文献
7.
A graphic sequence π =(d1, d2,..., dn) is said to be forcibly k-edge-connected if every realization of π is k-edge-connected. In this paper, we obtain a new sufficient degree condition for π to be forcibly k-edgeconnected. We also show that this new sufficient degree condition implies a strongest monotone degree condition for π to be forcibly 2-edge-connected and a conjecture about a strongest monotone degree condition for π to be forcibly 3-edge-connected due to... 相似文献
8.
The molecular geometries and dissociation energies of AnO (An = Bk–Lr) molecules were first obtained at thecoupled-cluster single-, double-, and perturbative triple-excitations [CCSD(T)] level of theory. Four hybrid functionals,B3LYP, M06-2X, TPSSh, and PBE0, were also employed in the calculations for the sake of comparison. In comparison ofthe CCSD(T) results, B3LYP, TPSSh, and PBE0 functionals can obtain more appropriate results than M06-2X and MP2.The analyses on molecular orbitals show that the 7s, 6d, and 5f atomic orbitals of actinide (An) atoms participate in thebonding of An–O bonds. The partial covalent nature between An and O atoms is revealed by QTAIM analyses. 相似文献
9.
Journal of Visualization - The increasing availability of spatiotemporal data provides unprecedented opportunities for understanding the structure of an urban area in terms of people’s... 相似文献
10.