全文获取类型
收费全文 | 255篇 |
免费 | 17篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 44篇 |
金属工艺 | 1篇 |
机械仪表 | 1篇 |
建筑科学 | 70篇 |
矿业工程 | 10篇 |
能源动力 | 8篇 |
轻工业 | 35篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 20篇 |
一般工业技术 | 19篇 |
冶金工业 | 62篇 |
自动化技术 | 16篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 12篇 |
2012年 | 11篇 |
2011年 | 13篇 |
2010年 | 9篇 |
2009年 | 16篇 |
2008年 | 11篇 |
2007年 | 14篇 |
2006年 | 15篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 6篇 |
2001年 | 9篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1998年 | 20篇 |
1997年 | 17篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 4篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 6篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1967年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有292条查询结果,搜索用时 0 毫秒
1.
W. Ming F. Melis R. D. van de Grampel L. van Ravenstein M. Tian R. van der Linde 《Progress in Organic Coatings》2003,48(2-4):316-321
Self-stratification strategy can be used to prepare films in which both bulk and surface properties can be optimized. By using this approach, only a very small quantity of fluorinated species is needed to generate a surface with low surface energy. When cross-linking is involved during film formation, we are dealing with a competition behavior between the diffusion of fluorinated species and the formation of cross-linked network. In this study low surface energy polymeric films were prepared on the basis of partially fluorinated polyisocyanates, in combination with hydroxyl-end-capped three-armed solventless liquid oligoesters and modified hyperbranched polyesters. At a fluorine concentration of only 0.5 wt.%, contact angles of water and hexadecane can reach 120° and 80°, respectively. A surface energy as low as 10–15 mN/m can be obtained upon the addition of less than 1 wt.% of fluorine in the films. It was shown, from real time ATR-FTIR and contact angle measurements, that the curing temperatures demonstrated significant effects on the cross-linking rate as well as on the wettability of the films. 相似文献
2.
3.
Erik D. Marchant Jamie P. Kaluhiokalani Taysom E. Wallace Mohadeseh Ahmadi Abigail Dorff Jessica J. Linde Olivia K. Leach Robert D. Hyldahl Jayson R. Gifford Chad R. Hancock 《International journal of molecular sciences》2022,23(15)
AIM: Mild heat stress can improve mitochondrial respiratory capacity in skeletal muscle. However, long-term heat interventions are scarce, and the effects of heat therapy need to be understood in the context of the adaptations which follow the more complex combination of stimuli from exercise training. The purpose of this work was to compare the effects of 6 weeks of localized heat therapy on human skeletal muscle mitochondria to single-leg interval training. METHODS: Thirty-five subjects were assigned to receive sham therapy, short-wave diathermy heat therapy, or single-leg interval exercise training, localized to the quadriceps muscles of the right leg. All interventions took place 3 times per week. Muscle biopsies were performed at baseline, and after 3 and 6 weeks of intervention. Mitochondrial respiratory capacity was assessed on permeabilized muscle fibers via high-resolution respirometry. RESULTS: The primary finding of this work was that heat therapy and exercise training significantly improved mitochondrial respiratory capacity by 24.8 ± 6.2% and 27.9 ± 8.7%, respectively (p < 0.05). Fatty acid oxidation and citrate synthase activity were also increased following exercise training by 29.5 ± 6.8% and 19.0 ± 7.4%, respectively (p < 0.05). However, contrary to our hypothesis, heat therapy did not increase fatty acid oxidation or citrate synthase activity. CONCLUSION: Six weeks of muscle-localized heat therapy significantly improves mitochondrial respiratory capacity, comparable to exercise training. However, unlike exercise, heat does not improve fatty acid oxidation capacity. 相似文献
4.
5.
本文从浦东开发区对发展上海的意义出发,说明其建设应更具有现代化的气息。又从浦东的地理环境和战略地位着手,分析了可能出现的各种灾害。讨论防御这些灾害的对策,得出了开发各类地下空间的必要性和可能性,并引伸出一些具体的开发利用地下空间的项目,为浦东和一些新开发区提出了一些有益的建议, 相似文献
6.
管治及城市与区域管治——一种新制度性规划理念 总被引:47,自引:4,他引:47
管治 (Governance)作为一种在政府与市场之间进行权利平衡再分配的制度性理念 ,已经愈来愈成为全球性的共同课题 ,并迅速渗透到城市与区域规划的具体行动中来。文章探究了管治概念的由来与本质 ,分析了管治理念在城市与区域规划中的体现 ,也客观评价了其局限性 ,为我国相应的研究与实践提供了先期借鉴 相似文献
7.
8.
9.
10.
Given an entire set of relevant balanced equations, BUNDLS and associated subroutines select all invariant points and order univariant lines around these points. Invariant points are formed by taking every set of m absent phases from each reaction. All revelant univariant lines are ordered around each invariant point by a direct application of the rules of Schreinemakers. The program also calculates true angular values for PT, P-μx1 or μy-μx diagrams. 相似文献