全文获取类型
收费全文 | 896篇 |
免费 | 29篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 5篇 |
综合类 | 105篇 |
化学工业 | 44篇 |
金属工艺 | 7篇 |
机械仪表 | 19篇 |
建筑科学 | 412篇 |
能源动力 | 12篇 |
轻工业 | 23篇 |
水利工程 | 1篇 |
石油天然气 | 10篇 |
武器工业 | 1篇 |
无线电 | 14篇 |
一般工业技术 | 41篇 |
冶金工业 | 49篇 |
自动化技术 | 190篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 10篇 |
2019年 | 65篇 |
2018年 | 24篇 |
2017年 | 17篇 |
2016年 | 45篇 |
2015年 | 42篇 |
2014年 | 54篇 |
2013年 | 60篇 |
2012年 | 70篇 |
2011年 | 70篇 |
2010年 | 63篇 |
2009年 | 61篇 |
2008年 | 52篇 |
2007年 | 51篇 |
2006年 | 33篇 |
2005年 | 33篇 |
2004年 | 22篇 |
2003年 | 34篇 |
2002年 | 29篇 |
2001年 | 13篇 |
2000年 | 13篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有933条查询结果,搜索用时 15 毫秒
81.
Introduces the new Student Editorial Board for School Psychology Quarterly. Along with the Research Design and Methodology Section and the Book Review Section, which made their inaugural appearance in the Winter 1998 issue, the Student Editorial Board is intended to strengthen both our journal and our field as we move into the next century. It is expected that the Student Editorial Board will result in symbiotic benefits for both our field and the board members themselves. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
82.
83.
No authorship indicated 《Canadian Metallurgical Quarterly》2001,56(9):759c
Memorializes Hermon Wilkes Martin, a pioneer of psychology in the South. Martin taught at Emory University for 40 yrs and led the formation of the Georgia Psychological Association. He was instrumental in the move to license psychologists and shepherded the inaugural bill to create the Georgia State Board of Examiners in Psychology through the state legislature in 1951. In addition, Martin founded the Howard School for children with attention deficit disorder. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
84.
85.
本文通过对厦门市思明区中、小学校舍建筑抗震性能现状摸底普查结果汇总分析,指出了辖区内校舍建筑在抗震构造措施及结构质量方面存在的不足之处,并提出了相应的抗震防灾应对策略。 相似文献
86.
87.
从学校建筑在地震灾害控制中的重要性出发,结合安溪县学校建筑抗震安全调查情况,分析了安溪县学校建筑的现状,并从建筑规划、结构体系、抗震构造和施工技术要求等方面探讨教学楼建筑在地震灾害控制中应注意的一些问题。 相似文献
88.
Debarun Dutta Timothy Zhao Kai Bing Cheah Larke Holmlund Mark D.P. Willcox 《Contact lens & anterior eye》2017,40(3):175-183
Purpose
To determine the antimicrobial activity of the melimine derived peptide Mel4 against Delftia, Stenotrophomonas, Elizabethkingia, Burkholderia and to investigate biocompatibility of Mel4 as an antimicrobial coating on contact lenses in animals and humans.Methods
In vitro antimicrobial activity of Mel4 was determined against the four Gram negative bacteria by investigating growth curves for 24 h followed by viable counts to determine the minimum inhibitory concentration (MIC). Contact lenses were coated by covalently binding Mel4, characterized by amino acid analysis, and were investigated for changes in lens parameters. Safety of Mel-4 coated lenses were determined in a rabbit model of daily contralateral wear. A prospective, randomised, double-masked, contralateral, 1week daily wear human clinical trial was used to evaluate subjective responses and ocular physiology.Results
Mel4 was active against all the bacteria tested (MIC50 ranged from 31–1000 μg ml?1) and produced an antimicrobial surface on contact lenses. Mel4-coating resulted hydrophilic surface without any significant change in contact lens parameters, and showed no signs of cytotoxicity or ocular irritation during rabbit wear. During human clinical trial, there were no differences between Mel4 coated and uncoated contact lenses in lens performance indicators and ocular signs such as corneal fluorescein staining. Mel4 and control uncoated lenses had no differences in ocular symptoms during lens wear.Conclusion
Mel4 has achieved antimicrobial activity against variety of Gram negative bacteria that are often resistant to the action of cationic peptides and have been implicated in contact lens related adverse events. Mel4-coated contact lenses were safe to wear. 相似文献89.
目的获得结晶好、连续均匀的CuS薄膜。方法采用电沉积方法制备CuS薄膜,研究络合剂、硫源及铜硫离子比例对镀液电化学性能的影响,分析不同沉积电位下所得薄膜的相组成。结果柠檬酸钠的络合效果最好,EDTA最差;硫代硫酸钠作为硫源时,其还原电位较硫脲为硫源时正,氧化电位较负,水平距离值较小,更容易实现共沉积;铜硫离子比例为1时,施镀最合适。沉积电位为-0.8 V时,薄膜的XRD图谱中有氧化亚铜的衍射峰;当沉积电位在-0.9 V时,生成了Cu2S相;沉积电位在-0.9~-1.2V时,生成了目标产物CuS,并且-1.2 V时的衍射峰强度比较高,结晶良好。结论最佳沉积条件如下:柠檬酸钠为络合剂,硫代硫酸钠为硫源,铜硫离子比为1,沉积电位为-1.2 V。 相似文献
90.
Changes in the principal’s role, resulting from the computerization of a high-school’s instruction-administration subsystem (i.e. a significant technological change), occurred in six major categories: accountability, instruction evaluation, supervision, feedback, frequency of meetings, and shared decision-making. The principal’s interrelations with department heads, homeroom teachers and teachers, tightened significantly. The principal’s interrelations with the school computer administrator (a new role created as a result of the introduction of a school management information system), were found to be tight and on a daily basis. The results of this research might have significant theoretical and practical implications. They should be related to SMIS impact on schooling in general and on the principal’s role in particular. 相似文献