全文获取类型
收费全文 | 1527篇 |
免费 | 126篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 97篇 |
综合类 | 4篇 |
化学工业 | 409篇 |
金属工艺 | 26篇 |
机械仪表 | 33篇 |
建筑科学 | 61篇 |
矿业工程 | 6篇 |
能源动力 | 48篇 |
轻工业 | 116篇 |
水利工程 | 7篇 |
石油天然气 | 3篇 |
无线电 | 137篇 |
一般工业技术 | 277篇 |
冶金工业 | 121篇 |
原子能技术 | 7篇 |
自动化技术 | 303篇 |
出版年
2023年 | 44篇 |
2022年 | 47篇 |
2021年 | 88篇 |
2020年 | 74篇 |
2019年 | 65篇 |
2018年 | 62篇 |
2017年 | 60篇 |
2016年 | 62篇 |
2015年 | 48篇 |
2014年 | 83篇 |
2013年 | 109篇 |
2012年 | 77篇 |
2011年 | 105篇 |
2010年 | 56篇 |
2009年 | 65篇 |
2008年 | 67篇 |
2007年 | 55篇 |
2006年 | 57篇 |
2005年 | 36篇 |
2004年 | 28篇 |
2003年 | 34篇 |
2002年 | 29篇 |
2001年 | 17篇 |
2000年 | 6篇 |
1999年 | 20篇 |
1998年 | 41篇 |
1997年 | 39篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 15篇 |
1993年 | 20篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 4篇 |
1973年 | 9篇 |
1972年 | 3篇 |
1943年 | 4篇 |
1942年 | 3篇 |
1940年 | 3篇 |
排序方式: 共有1655条查询结果,搜索用时 15 毫秒
71.
72.
73.
In order to analyze various process characteristics, grinding simulations can be used, which need accurate models of the tool and the individual grains. For this purpose, grinding tools can be digitized. To identify characteristic grains from a large number of measurements, each individual grain has to be analyzed and separated from the bond manually. Therefore, a deep learning-based methodology was developed to achieve a high segmentation accuracy of the grain boundaries efficiently. Additionally, a data augmentation approach was investigated to limit the data necessary for learning. The model transferability was quantified by analyzing different states of tool wear. 相似文献
74.
75.
76.
77.
78.
79.
Banani Kundu Nicholas E. Kurland Subia Bano Chinmoy Patra Felix B. Engel Vamsi K. Yadavalli Subhas C. Kundu 《Progress in Polymer Science》2014
Biomaterials of either natural or synthetic origin are used to fabricate implantable devices, as carriers for bioactive molecules or as substrates to facilitate tissue regeneration. For the design of medical devices it is fundamental to use materials characterized by non-immunogenicity, biocompatibility, slow and/or controllable biodegradability, non-toxicity, and structural integrity. The success of biomaterial-derived biodevices tends to be based on the biomimetic architecture of the materials. Recently, proteins from natural precursors that are essentially structural and functional polymers, have gained popularity as biomaterials. The silks produced by silkworms or spiders are of particular interest as versatile protein polymers. These form the basis for diverse biomedical applications that exploit their unique biochemical nature, biocompatibility and high mechanical strength. This review discusses and summarizes the latest advances in the engineering of silk-based biomaterials, focusing specifically on the fabrication of diverse bio-mimetic structures such as films, hydrogels, scaffolds, nanofibers and nanoparticles; their functionalization and potential for biomedical applications. 相似文献
80.
Crosslinked poly(ester urethane)s and their acrylate derivatives based on trifunctional polycaprolactone and trifunctional aliphatic isocyanates were synthesized. Biodegradable scaffolds with uniform, controlled micron-scale porosity were fabricated with these materials. Mechanical and swelling properties of monolithic and microporous materials were studied. Cytotoxicity, hydrolytic, and enzymatic degradation and their effects on mechanical properties of the biodegradable scaffolds were investigated. The polymer degradation products were found not to be cytotoxic at moderate concentrations and to permit cell attachment and spreading. Degradation rates and mechanical properties could be tuned to desired performance criteria for a given application by adjusting crosslink density and the ratio of hard segment to soft segment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48943. 相似文献