全文获取类型
收费全文 | 922篇 |
免费 | 7篇 |
专业分类
电工技术 | 15篇 |
综合类 | 1篇 |
化学工业 | 66篇 |
金属工艺 | 26篇 |
机械仪表 | 17篇 |
建筑科学 | 14篇 |
矿业工程 | 2篇 |
能源动力 | 5篇 |
轻工业 | 37篇 |
水利工程 | 6篇 |
石油天然气 | 6篇 |
无线电 | 84篇 |
一般工业技术 | 100篇 |
冶金工业 | 378篇 |
原子能技术 | 12篇 |
自动化技术 | 160篇 |
出版年
2021年 | 7篇 |
2018年 | 10篇 |
2017年 | 7篇 |
2015年 | 6篇 |
2014年 | 8篇 |
2013年 | 31篇 |
2012年 | 19篇 |
2011年 | 27篇 |
2010年 | 33篇 |
2009年 | 25篇 |
2008年 | 22篇 |
2007年 | 31篇 |
2006年 | 15篇 |
2005年 | 19篇 |
2004年 | 22篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 11篇 |
2000年 | 11篇 |
1999年 | 24篇 |
1998年 | 81篇 |
1997年 | 47篇 |
1996年 | 46篇 |
1995年 | 24篇 |
1994年 | 29篇 |
1993年 | 32篇 |
1992年 | 12篇 |
1991年 | 5篇 |
1990年 | 14篇 |
1989年 | 17篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 11篇 |
1985年 | 10篇 |
1984年 | 24篇 |
1983年 | 12篇 |
1982年 | 19篇 |
1981年 | 18篇 |
1980年 | 10篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 15篇 |
1976年 | 17篇 |
1975年 | 10篇 |
1974年 | 15篇 |
1973年 | 10篇 |
1972年 | 11篇 |
1971年 | 6篇 |
1970年 | 6篇 |
1966年 | 5篇 |
排序方式: 共有929条查询结果,搜索用时 31 毫秒
1.
2.
3.
We could not imagine a more appropriate inauguration of the Psychology of Aesthetics, Creativity, and the Arts (PACA) going to four issues per year than with a special issue honoring the life and work of the great aesthetician and psychologist, Rudolf Arnheim. PACA is off to a great start. With this move to four issues per year, we are restarting our numbering system, so this special issue is Volume 1, Issue 1. As you read the articles in this issue, we hope that you enjoy reflecting on how much Rudolf Arnheim has contributed to the field of psychology of aesthetics. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
5.
6.
Essential contribution of caspase 3/CPP32 to apoptosis and its associated nuclear changes 总被引:1,自引:0,他引:1
M Woo R Hakem MS Soengas GS Duncan A Shahinian D K?gi A Hakem M McCurrach W Khoo SA Kaufman G Senaldi T Howard SW Lowe TW Mak 《Canadian Metallurgical Quarterly》1998,12(6):806-819
Caspases are fundamental components of the mammalian apoptotic machinery, but the precise contribution of individual caspases is controversial. CPP32 (caspase 3) is a prototypical caspase that becomes activated during apoptosis. In this study, we took a comprehensive approach to examining the role of CPP32 in apoptosis using mice, embryonic stem (ES) cells, and mouse embryonic fibroblasts (MEFs) deficient for CPP32. CPP32(ex3-/-) mice have reduced viability and, consistent with an earlier report, display defective neuronal apoptosis and neurological defects. Inactivation of CPP32 dramatically reduces apoptosis in diverse settings, including activation-induced cell death (AICD) of peripheral T cells, as well as chemotherapy-induced apoptosis of oncogenically transformed CPP32(-/-) MEFs. As well, the requirement for CPP32 can be remarkably stimulus-dependent: In ES cells, CPP32 is necessary for efficient apoptosis following UV- but not gamma-irradiation. Conversely, the same stimulus can show a tissue-specific dependence on CPP32: Hence, TNFalpha treatment induces normal levels of apoptosis in CPP32 deficient thymocytes, but defective apoptosis in oncogenically transformed MEFs. Finally, in some settings, CPP32 is required for certain apoptotic events but not others: Select CPP32(ex3-/-) cell types undergoing cell death are incapable of chromatin condensation and DNA degradation, but display other hallmarks of apoptosis. Together, these results indicate that CPP32 is an essential component in apoptotic events that is remarkably system- and stimulus-dependent. Consequently, drugs that inhibit CPP32 may preferentially disrupt specific forms of cell death. 相似文献
7.
Of 1,666 patients who underwent fine needle aspiration for breast lumps, 4 developed pneumothorax as a complication. The incidence of this complication in our patients is 1:417. The clinical manifestations were immediate chest pain, shoulder pain and, occasionally, dyspnea that developed later. Observation is sufficient treatment in most patients, and rarely is drainage of the pneumothorax required. 相似文献
8.
M. B. Kaufman 《Measurement Techniques》1989,32(4):348-350
Translated from Izmeritel'naya Tekhnika, No. 4, pp. 38–39, April, 1989. 相似文献
9.
10.
Microstructural evolution in rapidly solidified Al-Fe alloys: An alternative explanation 总被引:7,自引:0,他引:7
The solidification sequences in aluminum containing 8 and 16 wt pct iron are described in terms of the formation of metastable
and stable primary intermetallic phases. These alloys were studied in the chill-cast and splat-quenched conditions, and marked
differences in microstructure due to the different cooling rates were observed. Contrary to previous work, it is proposed
that the 50-nm intercellular particles observed in the “zone A” regions of the splat-quenched alloys are primary in nature;
this may account, in part, for their remarkable thermal stability. 相似文献