全文获取类型
收费全文 | 369篇 |
免费 | 53篇 |
国内免费 | 11篇 |
专业分类
电工技术 | 4篇 |
综合类 | 31篇 |
化学工业 | 125篇 |
金属工艺 | 17篇 |
机械仪表 | 8篇 |
建筑科学 | 18篇 |
矿业工程 | 6篇 |
能源动力 | 8篇 |
轻工业 | 33篇 |
水利工程 | 2篇 |
石油天然气 | 10篇 |
无线电 | 60篇 |
一般工业技术 | 46篇 |
冶金工业 | 45篇 |
原子能技术 | 7篇 |
自动化技术 | 13篇 |
出版年
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 18篇 |
2020年 | 8篇 |
2019年 | 15篇 |
2018年 | 7篇 |
2017年 | 25篇 |
2016年 | 9篇 |
2015年 | 19篇 |
2014年 | 20篇 |
2013年 | 34篇 |
2012年 | 12篇 |
2011年 | 19篇 |
2010年 | 19篇 |
2009年 | 16篇 |
2008年 | 19篇 |
2007年 | 24篇 |
2006年 | 13篇 |
2005年 | 27篇 |
2004年 | 12篇 |
2003年 | 12篇 |
2002年 | 12篇 |
2001年 | 17篇 |
2000年 | 10篇 |
1999年 | 7篇 |
1998年 | 5篇 |
1997年 | 12篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有433条查询结果,搜索用时 15 毫秒
431.
Stefano Protti Alessandro Palmieri Marino Petrini Maurizio Fagnoni Roberto Ballini Angelo Albini 《Advanced Synthesis \u0026amp; Catalysis》2013,355(4):643-646
The photochemical synthesis of benzo[a]carbazoles from easily synthesizable 2‐aryl‐3‐(1‐tosylalkyl)indoles is presented. Irradiation of these substrates in polar aprotic solvents (acetone or THF) gives selectively the target products in satisfactory yields. This versatile and efficient procedure promises to be a useful alternative to the multistep strategies reported in the literature. 相似文献
432.
Ferran Pujol-Vila Pau Güell-Grau Josep Nogués Mar Alvarez Borja Sepúlveda 《Advanced functional materials》2023,33(14):2213109
Soft optomechanical systems have the ability to reversibly respond to optical and mechanical external stimuli by changing their own properties (e.g., shape, size, viscosity, stiffness, color or transmittance). These systems typically combine the optical properties of plasmonic, dielectric or carbon-based nanomaterials with the high elasticity and deformability of soft polymers, thus opening the path for the development of new mechanically tunable optical systems, sensors, and actuators for a wide range of applications. This review focuses on the recent progresses in soft optomechanical systems, which are here classified according to their applications and mechanisms of optomechanical response. The first part summarizes the soft optomechanical systems for mechanical sensing and optical modulation based on the variation of their optical response under external mechanical stimuli, thereby inducing mechanochromic or intensity modulation effects. The second part describes the soft optomechanical systems for the development of light induced mechanical actuators based on different actuation mechanisms, such as photothermal effects and phase transitions, among others. The final section provides a critical analysis of the main limitations of current soft optomechanical systems and the progress that is required for future devices. 相似文献
433.
Ji-Yu Zhu Alexander Mikhailovsky Samuel Chan Jun Wei Alex Moreland Jakkarin Limwongyut Nekane Guarrotxena Guillermo C. Bazan 《Advanced functional materials》2023,33(42):2305962
Conjugated oligoelectrolytes (COEs) comprise a class of cell-membrane intercalating molecules that serve as effective optical reporters. However, little is known about the photophysical properties of COEs in biological environments such as buffers, cell membranes, and intracellular organelles, which is critical to optimize performance. Herein, how COE self-assembly depends on the dielectric environment (polarity and ion content) is explored based on the representative molecule 6-ring phenylenevinylene (PV) conjugated oligoelectrolyte (COE-S6), and its optical properties within mammalian cells are subsequently studied. Two-photon fluorescence lifetime imaging microscopy (FLIM), confocal laser scanning microscopy, and optical properties in solutions are brought together to obtain information about the location, accumulation, and characteristics of the local surroundings. FLIM imaging lifetime phasor plots, decays, and fluorescence spectra on stained mammalian cells provide evidence of successful COE-S6 internalization via endocytosis. The fluorescence lifetime of COE-S6 is identical when in A549 mammalian cells and in giant unilamellar vesicle model membranes, thereby providing a correlation between living system and artificial constructs. 相似文献