全文获取类型
收费全文 | 2806篇 |
免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 13篇 |
机械仪表 | 1篇 |
建筑科学 | 1篇 |
轻工业 | 9篇 |
石油天然气 | 2篇 |
无线电 | 4篇 |
一般工业技术 | 11篇 |
冶金工业 | 2757篇 |
原子能技术 | 1篇 |
自动化技术 | 7篇 |
出版年
2018年 | 1篇 |
2015年 | 1篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2008年 | 5篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1999年 | 80篇 |
1998年 | 808篇 |
1997年 | 437篇 |
1996年 | 308篇 |
1995年 | 170篇 |
1994年 | 151篇 |
1993年 | 170篇 |
1992年 | 17篇 |
1991年 | 34篇 |
1990年 | 34篇 |
1989年 | 37篇 |
1988年 | 43篇 |
1987年 | 39篇 |
1986年 | 27篇 |
1985年 | 32篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 31篇 |
1978年 | 8篇 |
1977年 | 94篇 |
1976年 | 213篇 |
1975年 | 5篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1969年 | 2篇 |
1967年 | 2篇 |
1955年 | 4篇 |
排序方式: 共有2807条查询结果,搜索用时 0 毫秒
41.
EA Ratovitski MR Alam RA Quick A McMillan C Bao C Kozlovsky TA Hand RC Johnson RE Mains BA Eipper CJ Lowenstein 《Canadian Metallurgical Quarterly》1999,274(2):993-999
Nitric oxide (NO) acts as a neurotransmitter. However, excess NO produced from neuronal NO synthase (nNOS) or inducible NOS (iNOS) during inflammation of the central nervous system can be neurotoxic, disrupting neurotransmitter and hormone production and killing neurons. A screen of a hippocampal cDNA library showed that a unique region of the iNOS protein interacts with Kalirin, previously identified as an interactor with a secretory granule peptide biosynthetic enzyme. Kalirin associates with iNOS in vitro and in vivo and inhibits iNOS activity by preventing the formation of iNOS homodimers. Expression of exogenous Kalirin in pituitary cells dramatically reduces iNOS inhibition of ACTH secretion. Thus Kalirin may play a neuroprotective role during inflammation of the central nervous system by inhibiting iNOS activity. 相似文献
42.
43.
44.
Universal reaction-limited colloid aggregation 总被引:1,自引:0,他引:1
MY Lin HM Lindsay DA Weitz RC Ball R Klein P Meakin 《Canadian Metallurgical Quarterly》1990,41(4):2005-2020
45.
46.
RC Auvenshine 《Canadian Metallurgical Quarterly》1997,41(2):279-296
Psychoneuroimmunology (PNI) is a field of medicine which joins immunology and neurobiology. It focuses on the relationship of stress upon the hypothalamic-adrenal-pituitary (HPA) axis. Depletion of hormones and neurotransmitters within the HPA-axis, as a result of stress, can lead to a multitude of diseases and disorders. Therefore, it is necessary for the dentist to be familiar with PNI and the HPA-axis in order to make an accurate diagnosis of TMD. 相似文献
47.
RC King IL Kron RC Kanithanon KS Shockey WD Spotnitz CG Tribble 《Canadian Metallurgical Quarterly》1998,227(5):702-5; discussion 705-7
OBJECTIVE: The purpose of this study was to investigate the safety and efficacy of a period of deep hypothermic circulatory arrest (DHCA) during elective replacement of the ascending thoracic aorta. SUMMARY BACKGROUND DATA: DHCA has been implemented in ascending thoracic aortic aneurysm resection whenever the anatomy or pathology of the aorta or arch vessels prevents safe or adequate cross-clamping. Profound hypothermia and retrograde cerebral perfusion have been shown to be neurologically protective during ascending aortic replacement under circulatory arrest. METHODS: The authors conducted a retrospective analysis of 91 consecutive patients who underwent repair of chronic ascending thoracic aortic aneurysms from 1986 to present. The authors hypothesized that patients undergoing DHCA with or without retrograde cerebral perfusion during aneurysm repair were at no greater operative risk than patients who received aneurysm resection while on standard cardiopulmonary bypass. RESULTS: There were no significant differences in hospital mortality, stroke rate, or operative morbidity between patients repaired on DHCA when compared to those repaired on cardiopulmonary bypass. CONCLUSIONS: DHCA with or without retrograde cerebral perfusion does not result in increased morbidity or mortality during the resection of ascending thoracic aortic aneurysms. In fact, this technique may prevent damage to the arch vessels in select cases and avoid the possible complications associated with cross-clamping a friable or atherosclerotic aorta. 相似文献
48.
N Mach CS Lantz SJ Galli G Reznikoff M Mihm C Small R Granstein S Beissert M Sadelain RC Mulligan G Dranoff 《Canadian Metallurgical Quarterly》1998,91(3):778-783
The in vivo functions of interleukin-3 (IL-3) were investigated by generating IL-3-deficient mice. Although hematopoiesis was unimpaired in homozygous mutant animals, contact hypersensitivity reactions were compromised. IL-3 was required for efficient priming of hapten-specific contact hypersensitivity responses, but was dispensable for T-cell-dependent sensitization to tumor cells. These findings reveal a critical role for IL-3 in some forms of delayed-type hypersensitivity. 相似文献
49.
50.