全文获取类型
收费全文 | 3840篇 |
免费 | 138篇 |
国内免费 | 24篇 |
专业分类
化学 | 2356篇 |
晶体学 | 39篇 |
力学 | 71篇 |
数学 | 259篇 |
物理学 | 960篇 |
无线电 | 317篇 |
出版年
2023年 | 44篇 |
2022年 | 58篇 |
2021年 | 76篇 |
2020年 | 100篇 |
2019年 | 110篇 |
2018年 | 71篇 |
2017年 | 66篇 |
2016年 | 138篇 |
2015年 | 84篇 |
2014年 | 146篇 |
2013年 | 254篇 |
2012年 | 238篇 |
2011年 | 298篇 |
2010年 | 182篇 |
2009年 | 150篇 |
2008年 | 225篇 |
2007年 | 193篇 |
2006年 | 177篇 |
2005年 | 147篇 |
2004年 | 117篇 |
2003年 | 81篇 |
2002年 | 83篇 |
2001年 | 65篇 |
2000年 | 66篇 |
1999年 | 50篇 |
1998年 | 39篇 |
1997年 | 28篇 |
1996年 | 40篇 |
1995年 | 37篇 |
1994年 | 45篇 |
1993年 | 46篇 |
1992年 | 34篇 |
1991年 | 28篇 |
1990年 | 13篇 |
1989年 | 21篇 |
1988年 | 23篇 |
1987年 | 27篇 |
1986年 | 21篇 |
1985年 | 22篇 |
1984年 | 33篇 |
1983年 | 22篇 |
1982年 | 26篇 |
1981年 | 31篇 |
1980年 | 24篇 |
1979年 | 29篇 |
1978年 | 16篇 |
1977年 | 18篇 |
1976年 | 17篇 |
1975年 | 17篇 |
1957年 | 13篇 |
排序方式: 共有4002条查询结果,搜索用时 140 毫秒
1.
2.
3.
Inam Ridha Ali Basiri Sudhakar Godeshala Md Zubair Ebne Rafique Deepanjan Ghosh Jason Williams Nikhilesh Chawla Jung Keun Lee Jacquelyn Kilbourne Yu Yao Kaushal Rege 《Advanced functional materials》2021,31(6):2007811
Poor strength, infection, leakage, long procedure times, and inflammation limit the efficacy of common tissue sealing devices in surgeries and trauma. Light-activated sealing is attractive for tissue sealing and repair, and can be facilitated by the generation of local heat following absorption of nonionizing laser energy by chromophores. Here, the inherent ability of biomaterials is exploited to absorb nonionizing, mid-infrared (midIR) light in order to engender rapid photothermal sealing and repair of soft tissue wounds. In this approach, the biomaterial simultaneously acts as a photothermal convertor as well as a biosealant, which dispenses the need for exogeneous light-absorbing nanoparticles or dyes. Biomechanical recovery, mathematical modeling, histopathology analyses, tissue strain mapping using digital imaging correlation, and visualization of the biosealant-tissue interface using hyperspectral imaging indicate superior performance of midIR sealing in live mice compared to conventional sutures and glue. The midIR-biosealant approach demonstrates rapid sealing of soft tissues, improves cosmesis, lowers potential for scarring, obviates safety concerns because of the nonionizing light used, and allows adoption of a wide diversity of biomaterials. Taken together, the studies demonstrate a novel advance both in biomaterials for surgical sealing along with the use of nonionizing midIR light, with high potential for clinical translation. 相似文献
4.
It is explicitly shown that if phase transition occurs at the core of a newborn neutron star with moderately strong magnetic
field strength, which populates only the electron’s Landau levels, then in the β -equilibrium condition, the quark core is
energetically much more unstable than the neutron matter of identical physical condition. 相似文献
5.
An exact formalism for the relativistic version of Landau theory of Fermi liquid in presence of strong quantizing magnetic field is developed. Both direct and exchange type interactions with scalar and vector coupling cases are considered. 相似文献
6.
B. Ghosh 《等离子体物理论文集》1989,29(2):125-134
To describe the long time asymptotic behaviour of weakly nonlinear plasma waves propagating in a strongly magnetized plasmafilled cylindrical waveguide the usual KDV equation which is first order in wave amplitude is extended to second order including the effects of finite temperature, mobile ions and giving a proper treatment to the radial co-ordinate for all possible modes of propagation. The second-order effects on the first-order solitary wave profile, phase speed and first order correction to the wavelength are all determined and discussed. 相似文献
7.
8.
The study of the angular distribution of slow particles during high energy hadron-nucleus interaction indicates that emission of slow particles takes place from a thermally non-equilibrated system. This evidence has come out from the presence of intermittency - a phenomenon that reveals a fractal structure and represents a self-similarity in the particle production process. Hence, this study highlights inadequacy of cascade-evaporation model and advocates the need of its refinement. 相似文献
9.
So-Yon Lim Matt Meyer Richard A Kjonaas Swapan K Ghosh 《Journal of immune based therapies and vaccines》2007,5(1):3-1
This is a correction article. 相似文献
10.