全文获取类型
| 收费全文 | 1040篇 |
| 免费 | 26篇 |
专业分类
| 电工技术 | 2篇 |
| 综合类 | 1篇 |
| 化学工业 | 330篇 |
| 金属工艺 | 18篇 |
| 机械仪表 | 20篇 |
| 建筑科学 | 41篇 |
| 矿业工程 | 4篇 |
| 能源动力 | 24篇 |
| 轻工业 | 220篇 |
| 水利工程 | 19篇 |
| 石油天然气 | 8篇 |
| 无线电 | 49篇 |
| 一般工业技术 | 153篇 |
| 冶金工业 | 89篇 |
| 原子能技术 | 3篇 |
| 自动化技术 | 85篇 |
出版年
| 2024年 | 27篇 |
| 2023年 | 18篇 |
| 2022年 | 51篇 |
| 2021年 | 69篇 |
| 2020年 | 36篇 |
| 2019年 | 46篇 |
| 2018年 | 37篇 |
| 2017年 | 26篇 |
| 2016年 | 38篇 |
| 2015年 | 29篇 |
| 2014年 | 39篇 |
| 2013年 | 86篇 |
| 2012年 | 77篇 |
| 2011年 | 86篇 |
| 2010年 | 40篇 |
| 2009年 | 44篇 |
| 2008年 | 49篇 |
| 2007年 | 43篇 |
| 2006年 | 32篇 |
| 2005年 | 18篇 |
| 2004年 | 17篇 |
| 2003年 | 15篇 |
| 2002年 | 11篇 |
| 2001年 | 11篇 |
| 2000年 | 4篇 |
| 1999年 | 6篇 |
| 1998年 | 17篇 |
| 1997年 | 15篇 |
| 1996年 | 6篇 |
| 1995年 | 7篇 |
| 1994年 | 12篇 |
| 1993年 | 5篇 |
| 1992年 | 4篇 |
| 1991年 | 3篇 |
| 1990年 | 2篇 |
| 1989年 | 6篇 |
| 1988年 | 5篇 |
| 1987年 | 4篇 |
| 1986年 | 2篇 |
| 1985年 | 2篇 |
| 1984年 | 5篇 |
| 1982年 | 3篇 |
| 1981年 | 2篇 |
| 1980年 | 1篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1977年 | 3篇 |
| 1976年 | 2篇 |
| 1975年 | 2篇 |
| 1971年 | 1篇 |
排序方式： 共有1066条查询结果，搜索用时 15 毫秒
91.
Textiles have emerged as a promising class of materials for developing wearable robots that move and feel like everyday clothing. Textiles represent a favorable material platform for wearable robots due to their flexibility, low weight, breathability, and soft hand-feel. Textiles also offer a unique level of programmability because of their inherent hierarchical nature, enabling researchers to modify and tune properties at several interdependent material scales. With these advantages and capabilities in mind, roboticists have begun to use textiles, not simply as substrates, but as functional components that program actuation and sensing. In parallel, materials scientists are developing new materials that respond to thermal, electrical, and hygroscopic stimuli by leveraging textile structures for function. Although textiles are one of humankind's oldest technologies, materials scientists and roboticists are just beginning to tap into their potential. This review provides a textile-centric survey of the current state of the art in wearable robotic garments and highlights metrics that will guide materials development. Recent advances in textile materials for robotic components (i.e., as sensors, actuators, and integration components) are described with a focus on how these materials and technologies set the stage for wearable robots programmed at the material level. 相似文献
92.
Shuai Li Johannes M. Scheiger Zhenwu Wang Zheqin Dong Alexander Welle Vanessa Trouillet Pavel A. Levkin 《Advanced functional materials》2021,31(50):2107716
Polydopamine coating is a unique, simple, and substrate-independent surface functionalization strategy. Techniques for secondary functionalization, patterning, and re-functionalization of polydopamine modified materials are important to broaden the scope of applications of such materials in a variety of fields. Here, a facile and substrate-independent strategy for surface functionalization and patterning is presented. This approach combines the advantages of three important methods: facile and substrate-independent polydopamine coating, versatile gas phase silanization, and rapid thiol-ene photoclick reaction for patterning. They demonstrate equally efficient functionalization and patterning of diverse materials, such as glass, polytetrafluoroethylene, aluminum, polypropylene, or polyethylene. They also show the possibility of controlled chemical removal of the patterns or surface functionalization by treatment with tetrabutylammonium fluoride, which allows re-modification or re-patterning of the substrate. Thus, this universal and powerful approach for substrate independent surface modification and patterning can significantly facilitate the development of novel functional materials and devices useful for various applications. 相似文献
93.
94.
95.
Lisa R. Hoving Saeed Katiraei Marieke Heijink Amanda Pronk Lianne van der Wee‐Pals Trea Streefland Martin Giera Ko Willems van Dijk Vanessa van Harmelen 《Molecular nutrition & food research》2018,62(10)
1 Scope
Mannan oligosaccharides (MOS) have proven effective at improving growth performance, while also reducing hyperlipidemia and inflammation. As atherosclerosis is accelerated both by hyperlipidemia and inflammation, we aim to determine the effect of dietary MOS on atherosclerosis development in hyperlipidemic ApoE*3‐Leiden.CETP (E3L.CETP) mice, a well‐established model for human‐like lipoprotein metabolism.2 Methods and results
Female E3L.CETP mice were fed a high‐cholesterol diet, with or without 1% MOS for 14 weeks. MOS substantially decreased atherosclerotic lesions up to 54%, as assessed in the valve area of the aortic root. In blood, IL‐1RA, monocyte subtypes, lipids, and bile acids (BAs) were not affected by MOS. Gut microbiota composition was determined using 16S rRNA gene sequencing and MOS increased the abundance of cecal Bacteroides ovatus. MOS did not affect fecal excretion of cholesterol, but increased fecal BAs as well as butyrate in cecum as determined by gas chromatography mass spectrometry.3 Conclusion
MOS decreased the onset of atherosclerosis development via lowering of plasma cholesterol levels. These effects were accompanied by increased cecal butyrate and fecal excretion of BAs, presumably mediated via interactions of MOS with the gut microbiota. 相似文献96.
Vanessa Rose Gretchen Rollwagen‐Bollens Stephen M. Bollens Julie Zimmerman 《河流研究与利用》2019,35(9):1478-1488
Dams, increasingly common in riverine systems worldwide, are particularly prevalent on the Columbia River (CR) in the United States. Hydroelectric projects, including both storage and run‐of‐river (i.e., minimal storage) structures, on the mainstem CR highly manage water flow, often by releasing water over (rather than through) dams as “spill.” To test the effects of run‐of‐river dam spill on microplankton abundance and composition, we sampled above and below two dams in the lower CR before and during spill conditions in spring 2016 and during and after spill conditions in late summer 2007. We tested the effects of location (i.e., above vs. below dams), spill condition (i.e., before, during, and after spill), and their interaction on microplankton abundance. Generally, diatoms were most abundant during springtime, whereas cyanobacteria were most abundant in late summer. Most taxa were not significantly different in abundance above and below dams, regardless of spill status; although cyanobacteria abundance was marginally higher below dams in summer 2007 (p = .04). Abundances of all taxa were significantly different between pre‐spill and spill periods in spring 2016, whereas only diatom and flagellate abundances were significantly different between spill and post‐spill periods in summer 2007. We conclude that spill conditions may influence microplankton abundance, but are not likely to affect microplankton communities on either side of run‐of‐river dams on the CR. This is important information for dam managers concerned about ecosystem impacts of spill. 相似文献
97.
Vanessa H. Fragal Elizngela H. Fragal Tao Zhang Xiaoxi Huang Thelma Sley P. Cellet Guilherme M. Pereira Andrei Jitianu Adley F. Rubira Rafael Silva Tewodros Asefa 《Advanced functional materials》2019,29(8)
In this work, the synthesis of high‐performance, metal ion‐imprinted, mesoporous carbon electrocatalysts for hydrazine oxidation reaction (HzOR) using casein or a family of phosphoproteins derived from cow's milk as a precursor is shown. The synthesis is made possible by mixing trace amounts of non‐noble metal ions (Fe3+ or Co2+) with casein and then producing different metal ions‐functionalized casein intermediates, which upon carbonization, followed by acid treatment, lead to metal ion‐imprinted catalytically active sites on the materials. The materials effectively electrocatalyze HzOR with low overpotentials at neutral pH and exhibit among the highest electrocatalytic performances ever reported for carbon catalysts. Their catalytic activities are also better than the corresponding control material, synthesized by carbonization of pure casein and other materials previously reported for HzOR. This work demonstrates a novel synthetic route that transforms an inexpensive protein to highly active carbon‐based electrocatalysts by modifying its surfaces with trace amounts of non‐noble metals. The types of metal ions employed in the synthesis are found to dictate the electrocatalytic activities of the materials. Notably, Fe3+ is found to be more effective than Co2+ in helping the conversion of casein into more electrocatalytically active carbon materials for HzOR. 相似文献
98.
Olga Soares do Rêgo Barros Francielle Rodrigues Silva Vanessa Loren Nunes 《Journal of Sulfur Chemistry》2019,40(1):9-17
We reported the synthesis of copper (I)-selenophene-2-carboxylate (CuSC) and application as new catalyst in the cross-coupling reactions of thiols with aryl iodide to afford the corresponding unsymmetrical thioethers. The optimized reaction conditions were applied to thiols and aryl iodides having a wide range of functional groups, including electron rich and electron poor substrates. The chemoselectivity of the reaction with 4-iodobromobenzene and 2-aminothiophenol derivatives was briefly examined through the competitive iodine versus bromine and thiol versus nitrogen cross-coupling. 相似文献
99.
100.