全文获取类型
收费全文 | 330篇 |
免费 | 17篇 |
国内免费 | 3篇 |
学科分类
工业技术 | 350篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 12篇 |
2020年 | 9篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 13篇 |
2016年 | 13篇 |
2015年 | 15篇 |
2014年 | 23篇 |
2013年 | 31篇 |
2012年 | 23篇 |
2011年 | 23篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 11篇 |
2007年 | 4篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2003年 | 6篇 |
2002年 | 13篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 12篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1970年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有350条查询结果,搜索用时 0 毫秒
31.
Scientometrics - The development and successful implementation of R&D policies depends on understanding patterns of scientific collaboration (SC). Existing studies on SC typically focus on... 相似文献
32.
33.
A high efficiency Yb:YAG/YAG composite slab laser is presented, in which the corner-pumped scheme is adopted. The slab is a composite crystal of Yb:YAG bonded thermally with undoped YAG at both edges. The pump light from diode arrays is coupled into the slab through four chamfers at the four corners independently. The pump absorption efficiency is studied, and an analysis method has been developed as a guide to optimize the geometric parameters of the composite slab, to obtain higher pump absorption efficiency and uniformity. The influence of the internal thermal lens on the laser resonator is analyzed. A 1016 W continuous-wave output has been obtained with the slope efficiency and optical-to-optical efficiency of 42.8% and 34.4%, respectively. 相似文献
34.
35.
Fine-grained ceramics (with a grain size on the order of a micron) have been produced by the spark plasma sintering (SPS) of various alumina nanopowders. We have compared the microhardness of ceramic samples prepared from 11 alumina nanopowders and that of composites based on such powders. The ceramics have been prepared by both SPS and a conventional technique (sequential pressing and sintering). We examine the effect of the phase composition and average particle size of the starting nanopowder on the microhardness of the ceramics. 相似文献
36.
S.S. Kalagi S.S. Mali D.S. Dalavi A.I. Inamdar Hyunsik Im P.S. Patil 《Synthetic Metals》2011,161(11-12):1105-1112
Inorganic tungsten oxide (WO3) and organic polyaniline (PANI) films were used as the cathodic and anodic electrodes of an inorganic–organic electrochromic device (IOECD). WO3 was deposited by sputtering while PANI films were electrodeposited on transparent Indium doped Tin Oxide (ITO) glass substrates, respectively. Optical and electrochemical studies were performed to find the optical attenuation, coloration efficiencies, reversibility and response time separately for the individual films as well as for the assembled IOECD. The change in transmittance of WO3 film was found to be 63.92%. PANI film showed an optical attenuation of 50.69% while the transmission change through the IOECD was equal to 57%. Colorimetric analysis was done to define the colors in the bleached and colored states in terms of L*ab values and xy chromaticity diagram. Factors limiting the performance of an IOECD were analyzed. It was found that in a charge unbalanced dual complementary IOECD, the coloration efficiency is always less than that of one of the constituent electrodes. 相似文献
37.
38.
39.
Sawanta S. Mali Promod S. Patil Popatrao N. Bhosale Chang Kook Hong 《Journal of Materials Science》2014,49(14):5100-5111
Cadmium sulfide (CdS) has been employed as an alternative acceptor for planar heterojunction solar cell based on copper phthalocyanine (CuPc). Spin-coated poly-3,4-ethylenedioxythiophene:polystyrenesulfonate (PEDOT:PSS) on indium tin oxide (ITO)-coated glass substrates was used for the vacuum deposition of CuPc and CdS planar heterojunction. In the present study, we have fabricated two different architectures of CuPc/CdS devices: (1) ITO/PEDOT:PSS/CuPc/CdS/Al and (2) ITO/PEDOT:PSS/CuPc/CdS/LiF/Al. Our results indicate that the CdS could effectively facilitate charge transport in the nanostructured network, and be a good acceptor. The fabricated bare CuPc/CdS device shows 0.13 % conversion efficiency while incorporation of LiF layer between CuPc/CdS and Al contact facilitates low-recombination rate results ~43 % enhancement in efficiency. The ITO/PEDOT:PSS/CuPc/CdS/LiF/Al device shows 0.30 % power conversion efficiency. 相似文献
40.
日本当代前卫艺术家村上隆作品探析 总被引:1,自引:1,他引:0
日本当代前卫艺术家村上隆在继承日本传统文化的基础上,模仿与借鉴西方文化,在他的作品中东方传统与西方文明达到了完美融合.在日益浮躁的现代社会中,艺术趋媚于大众趣味,村上隆将精英文化融入通俗文化创作中,为通俗文化与高雅艺术的结合找到了沟通的桥梁.同时,在艺术作品被认为必须崇高与纯粹的时候,村上隆则以商业态度进行艺术创作,实现了艺术创作与商业时尚的交集. 相似文献