全文获取类型
收费全文 | 74972篇 |
免费 | 5863篇 |
国内免费 | 2647篇 |
专业分类
电工技术 | 4402篇 |
技术理论 | 3篇 |
综合类 | 6963篇 |
化学工业 | 11243篇 |
金属工艺 | 4002篇 |
机械仪表 | 4610篇 |
建筑科学 | 5006篇 |
矿业工程 | 1676篇 |
能源动力 | 2063篇 |
轻工业 | 6624篇 |
水利工程 | 1502篇 |
石油天然气 | 2869篇 |
武器工业 | 548篇 |
无线电 | 8930篇 |
一般工业技术 | 7901篇 |
冶金工业 | 3041篇 |
原子能技术 | 1038篇 |
自动化技术 | 11061篇 |
出版年
2025年 | 214篇 |
2024年 | 1015篇 |
2023年 | 995篇 |
2022年 | 1553篇 |
2021年 | 2197篇 |
2020年 | 1882篇 |
2019年 | 1697篇 |
2018年 | 1625篇 |
2017年 | 1851篇 |
2016年 | 1886篇 |
2015年 | 2549篇 |
2014年 | 3393篇 |
2013年 | 4092篇 |
2012年 | 4818篇 |
2011年 | 5193篇 |
2010年 | 4914篇 |
2009年 | 4857篇 |
2008年 | 4851篇 |
2007年 | 4648篇 |
2006年 | 4543篇 |
2005年 | 3821篇 |
2004年 | 3149篇 |
2003年 | 2839篇 |
2002年 | 3395篇 |
2001年 | 2955篇 |
2000年 | 2007篇 |
1999年 | 1444篇 |
1998年 | 944篇 |
1997年 | 786篇 |
1996年 | 711篇 |
1995年 | 615篇 |
1994年 | 452篇 |
1993年 | 335篇 |
1992年 | 267篇 |
1991年 | 206篇 |
1990年 | 175篇 |
1989年 | 112篇 |
1988年 | 106篇 |
1987年 | 83篇 |
1986年 | 33篇 |
1985年 | 54篇 |
1984年 | 41篇 |
1983年 | 32篇 |
1982年 | 19篇 |
1981年 | 19篇 |
1980年 | 18篇 |
1979年 | 14篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
HoSeok Park Young‐Chul Lee Bong Gill Choi Yeong Suk Choi Ji‐Won Yang Won Hi Hong 《Small (Weinheim an der Bergstrasse, Germany)》2010,6(2):290-295
Energy transfer in self‐assembled ionic liquids (ILs) and iron oxyhydroxide nanocrystals and the controlled surface chemistry of functionalized nanomaterials for photocatalytic applications are reported. Self‐assembled ILs play the role of multifunctional materials in terms of constructing a well‐designed nanostructure, controlling the surface chemistry, and triggering the energy transfer of functionalized materials. IL‐functionalized β‐FeOOH nanorods show ≈10‐fold higher performances than those of commercial materials due to the synergistic effect of well‐defined nanomaterials in diffusion‐controlled reactions, specific interactions with target pollutants, and energy transfers in hybrid materials. In particular, the energy transfer in C4MimCl‐functionalized β‐FeOOH nanorods enhances photocatalytic activity due to the generation of Fe2+. The strategy described herein provides new insight into the rational design of functionalized inorganic nanomaterials for applications in emerging technologies. 相似文献
992.
Plasticized polysaccharide coatings on polypropylene (PP) film were prepared to evaluate the optical and tensile properties of the resulting coated films, as affected by biopolymer and plasticizer types, in order to develop a novel film structure of biopolymer coatings on common plastics intended for food packaging applications. Composite structures of PP film coated with several kinds of polysaccharides (MC, HPMC, chitosan, κ ‐carrageenan, dextrin) and plasticizers (PG, glycerol, PEG, sucrose, sorbitol) were obtained through a simple casting method. High glossy surfaces were observed on the coated films with chitosan and κ ‐carrageenan, with the sucrose‐plasticized chitosan coating giving the highest gloss of 142.7 GU. Biopolymers, but no plasticizers, exerted noticeable influence on the colour of the coated films. Chitosan‐ and κ ‐carrageenan‐coated PP films also showed greater transparency, tensile strength and elongation than the other coated films. Nisin‐incorporated κ ‐carrageenan coatings on PP film exhibited significant bacterial growth inhibition against Lactobacillus plantarum . The results suggest that coatings based on chitosan and κ ‐carrageenan with proper plasticizers possess excellent visual and mechanical characteristics and have great potential for acting efficiently as antimicrobial agent carriers in active packaging systems. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
993.
Li H Yin Z He Q Li H Huang X Lu G Fam DW Tok AI Zhang Q Zhang H 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(1):63-67
Single- and multilayer MoS(2) films are deposited onto Si/SiO(2) using the mechanical exfoliation technique. The films were then used for the fabrication of field-effect transistors (FETs). These FET devices can be used as gas sensors to detect nitrous oxide (NO). Although the single-layer MoS(2) device shows a rapid response after exposure to NO, the current was found to be unstable. The two-, three-, and four-layer MoS(2) devices show both stable and sensitive responses to NO down to a concentration of 0.8 ppm. 相似文献
994.
Wang H Chung TS Tong YW Jeyaseelan K Armugam A Chen Z Hong M Meier W 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(8):1185-90, 1125
A highly permeable yet highly selective pore-spanning biomimetic membrane embedded with aquaporin Z is molecularly designed and constructed via a combination of pressure-assisted vesicle adsorption and covalent-conjugation-driven vesicle fusion on a porous support. This approach represents a significant breakthrough in the architecture of biomimetic membranes embedded with aquaporin in a planar form. 相似文献
995.
996.
997.
998.
Kim BH Lee DH Kim JY Shin DO Jeong HY Hong S Yun JM Koo CM Lee H Kim SO 《Advanced materials (Deerfield Beach, Fla.)》2011,23(47):5618-5622
Mussel-inspired interfacial engineering is synergistically integrated with block copolymer (BCP) lithography for the surface nanopatterning of low surface energy substrate materials, including, Teflon, graphene, and gold. The image shows the Teflon nanowires and their excellent superhydrophobicity. 相似文献
999.
1000.