全文获取类型
收费全文 | 2085篇 |
免费 | 400篇 |
国内免费 | 147篇 |
专业分类
电工技术 | 51篇 |
综合类 | 109篇 |
化学工业 | 713篇 |
金属工艺 | 79篇 |
机械仪表 | 46篇 |
建筑科学 | 96篇 |
矿业工程 | 19篇 |
能源动力 | 49篇 |
轻工业 | 82篇 |
水利工程 | 7篇 |
石油天然气 | 34篇 |
武器工业 | 11篇 |
无线电 | 544篇 |
一般工业技术 | 594篇 |
冶金工业 | 42篇 |
原子能技术 | 1篇 |
自动化技术 | 155篇 |
出版年
2024年 | 10篇 |
2023年 | 62篇 |
2022年 | 64篇 |
2021年 | 89篇 |
2020年 | 92篇 |
2019年 | 103篇 |
2018年 | 105篇 |
2017年 | 110篇 |
2016年 | 119篇 |
2015年 | 123篇 |
2014年 | 157篇 |
2013年 | 142篇 |
2012年 | 154篇 |
2011年 | 170篇 |
2010年 | 106篇 |
2009年 | 115篇 |
2008年 | 92篇 |
2007年 | 117篇 |
2006年 | 112篇 |
2005年 | 92篇 |
2004年 | 90篇 |
2003年 | 72篇 |
2002年 | 48篇 |
2001年 | 63篇 |
2000年 | 48篇 |
1999年 | 47篇 |
1998年 | 27篇 |
1997年 | 22篇 |
1996年 | 10篇 |
1995年 | 23篇 |
1994年 | 12篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 5篇 |
1984年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有2632条查询结果,搜索用时 31 毫秒
991.
利用基于传输矩阵法(Transfer matrix method,TMM)的光学模型系统地研究了金属电极材料(Ag、Al、Au)对聚合物太阳能电池光学性能的影响.研究表明,与传统铟锡化合物(Indium tin oxide,ITO)透明电极相比,以合适厚度的金属Ag膜作透明电极,可提高活性层对入射光子的吸收效率;同时,以Ag膜作背电极时,其相应的聚合物太阳能电池的效率优于以Al或者Au为背电极的电池的效率. 相似文献
992.
Development of Ga-doped ZnO transparent electrodes for liquid crystal display panels 总被引:1,自引:0,他引:1
N. Yamamoto H. MakinoS. Osone A. UjiharaT. Ito H. HokariT. Maruyama T. Yamamoto 《Thin solid films》2012,520(12):4131-4138
Liquid crystal displays (LCDs) with Ga-doped ZnO (GZO) transparent electrodes on RGB color filters were fabricated to demonstrate the feasibility of using this new material as an alternative to indium tin oxide (ITO) electrodes. The process flow for fabricating LCDs with GZO electrodes was entirely compatible with that for commercially available LCDs using ITO electrodes. Concurrently, photolithography processing and wet-chemical etching techniques for the formation of GZO transparent electrodes on thin film transistor (TFT) arrays in LCD panels was developed. Fine-patterns of GZO with 2-μm line widths were successfully formed using lithography and wet -etching technology with a weakly acidic etchant of pH 5.5-6.8. 相似文献
993.
994.
995.
996.
997.
Cold Isostatic‐Pressured Silver Nanowire Electrodes for Flexible Organic Solar Cells via Room‐Temperature Processes 下载免费PDF全文
Ji Hoon Seo Inchan Hwang Han‐Don Um Sojeong Lee Kangmin Lee Jeonghwan Park Hyeonoh Shin Tae‐Hyuk Kwon Seok Ju Kang Kwanyong Seo 《Advanced materials (Deerfield Beach, Fla.)》2017,29(30)
Transparent conducting electrodes (TCEs) are considered to be an essential structural component of flexible organic solar cells (FOSCs). Silver nanowire (AgNW) electrodes are widely used as TCEs owing to their excellent electrical and optical properties. The fabrication of AgNW electrodes has faced challenges in terms of forming large uniform interconnected networks so that high conductivity and reproducibility can be achieved. In this study, a simple method for creating an intimate contact between AgNWs that uses cold isostatic pressing (CIP) is demonstrated. This method increases the conductivity of the AgNW electrodes, which enables the fabrication of high‐efficiency inverted FOSCs that have a power conversion efficiency of 8.75% on flexible polyethylene terephthalate with no short circuiting occurring as the CIP process minimizes the surface roughness of the AgNW electrode. This allows to achieve 100% manufacturing yield of FOSCs. Furthermore, these highly efficient FOSCs are proven to only be 2.4% less efficient even for an extreme bending radius of R ≈ 1.5 mm, compared with initial efficiency. 相似文献
998.
999.
Al-doped transparent conducting zinc oxide (AZO) films, approximately 20-110 nm-thick, were deposited on glass substrates at substrate temperatures between 200 and 300 °C by pulsed laser deposition (PLD) using an ArF excimer laser (λ = 193 nm). When fabricated at a substrate temperature of 260 °C, a 40-nm-thick AZO film showed a low resistivity of 2.61 × 10− 4 Ω·cm, carrier concentration of 8.64 × 1020 cm− 3, and Hall mobility of 27.7 cm2/V·s. Furthermore, for an ultrathin 20-nm-thick film, a resistivity of 3.91 × 10− 4 Ω·cm, carrier concentration of 7.14 × 1020 cm− 3, and Hall mobility of 22.4 cm2/V·s were obtained. X-ray diffraction (XRD) spectra, obtained by the θ-2θ method, of the AZO films grown at a substrate temperature of 260 °C showed that the diffraction peak of the ZnO (0002) plane increased as the film thickness increased from 20 to 110 nm. The full-width-at-half-maximum (FWHM) values were 0.5500°, 0.3845°, and 0.2979° for film thicknesses of 20, 40, and 110 nm, respectively. For these films, the values of the average transmittance in visible light wavelengths (400-700 nm) were 95.1%, 94.2%, and 96.6%, respectively. Field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) observations showed that even the 20-nm-thick films did not show island structures. In addition, exfoliated areas or vacant and void spaces were not observed for any of the films. 相似文献
1000.