全文获取类型
收费全文 | 1132篇 |
免费 | 20篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 6篇 |
综合类 | 2篇 |
化学工业 | 118篇 |
金属工艺 | 10篇 |
机械仪表 | 16篇 |
建筑科学 | 2篇 |
能源动力 | 15篇 |
轻工业 | 61篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 34篇 |
一般工业技术 | 92篇 |
冶金工业 | 735篇 |
原子能技术 | 1篇 |
自动化技术 | 59篇 |
出版年
2023年 | 10篇 |
2022年 | 15篇 |
2021年 | 23篇 |
2020年 | 18篇 |
2019年 | 11篇 |
2018年 | 24篇 |
2017年 | 13篇 |
2016年 | 23篇 |
2015年 | 12篇 |
2014年 | 17篇 |
2013年 | 39篇 |
2012年 | 26篇 |
2011年 | 27篇 |
2010年 | 18篇 |
2009年 | 12篇 |
2008年 | 12篇 |
2007年 | 12篇 |
2006年 | 5篇 |
2005年 | 14篇 |
2004年 | 9篇 |
2003年 | 8篇 |
2002年 | 3篇 |
2001年 | 7篇 |
2000年 | 6篇 |
1999年 | 15篇 |
1998年 | 169篇 |
1997年 | 116篇 |
1996年 | 88篇 |
1995年 | 48篇 |
1994年 | 41篇 |
1993年 | 53篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 12篇 |
1981年 | 5篇 |
1980年 | 22篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 44篇 |
1976年 | 100篇 |
1967年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1155条查询结果,搜索用时 218 毫秒
61.
GIu Sharaevski? LA Tiunov VV Chumakov VS Sukhorukov 《Canadian Metallurgical Quarterly》1996,317(8):66-70, 80
From position of the uniform concept of the accident medicine the problems of toxicological supply of the ships of MNF are considered. Peculiarities of chemical accidents in the ship conditions are marked. The question about principles of harmful chemical substances regulating, forming air environment of ship living quarters is discussed. The prospects of practical use of antidotal means, intended for protection of personnel from toxic action of carbon dioxide and chemical combinations, causing development of toxic edema of lungs are given. 相似文献
62.
63.
K Warren E Goldstein VS Hung JE Koehler W Richardson 《Canadian Metallurgical Quarterly》1998,116(7):937-940
A patient with the acquired immunodeficiency syndrome developed bilateral retinitis due to a Bartonella (formerly Rochalimaea) henselae infection. A retinal biopsy was performed when severe and progressive retinal infection failed to respond to empirical treatment for cytomegalovirus and Toxoplasma gondii. The biopsy specimen was stained with routine histopathological stains and the Steiner silver stain. Ribosomal DNA was extracted from formalinfixed, paraffin-embedded retinal tissue and amplified with the polymerase chain reaction assay, using Bartonella-specific primers. The amplified DNA fragment was cloned and sequenced. Staining with hematoxylin-eosin revealed tufts of proliferating vascular endothelium with numerous fusiformappearing cells, consistent with a diagnosis of bacillary angiomatosis. A Steiner silver stain revealed numerous small bacilli in the biopsy specimen. Amplification of DNA extracted from the tissue produced a fragment of 16S ribosomal DNA of the expected size; sequencing of the DNA fragment revealed that the infection was caused by B henselae. The retinal infection was treated with minocycline, doxycycline, and ciprofloxacin with improvement in visual acuity in the ensuing 12 weeks. To our knowledge, this is the first human immunodeficiency virus-infected patient with retinitis due to B henselae who was diagnosed by the identification of silver-staining bacilli and amplification and sequencing of B henselae with a polymerase chain reaction assay using a biopsy specimen of retinal tissue. Retinal biopsy is indicated, despite its potential for serious complications, in patients with acquired immunodeficiency syndrome who have a progressive, sight-threatening retinitis that is undiagnosed and unresponsive to therapy. 相似文献
64.
65.
It is known that drugs are not unlimitedly stable. Dilutions of the antineoplastic agent daunoblastin used in the clinic and experimental work, were examined, whether they could be stored for several days. By means of impulscytophotometry, spectral-photometric measurements, counting of surviving cells and estimation of DNA-synthesis after culturing pieces of tissue in the presence of daunoblastin it could be established that this drug, diluted even four days ago, still possesses sufficient activity. 相似文献
66.
67.
68.
69.
A method is presented for the synthesis of RC 1-ports with a minimum possible number of capacitors, all of equal value and all connected to a common terminal of the 1-port. Such a realisation facilitates economical integrated- circuit fabrication and is of importance in integrated active RC 2-port synthesis. 相似文献
70.
AS Pavlov VS Datsenko MA Fadeeva OA Zamiatin EV Kizhaev 《Canadian Metallurgical Quarterly》1980,26(3):3-8
The authors present an analysis of the causes of radiation induced complications in 383 patients referred to the Chair of Clinical Radiology from different medical institutions of the country. It was found that under distant gamma therapy, to prevent the development of complications the value of TDF-factor should not exceed 105--110, for the associated radiotherapy--130--140, and that for close focal roentgenotherapy--130--150. In vast majority of patients (95.3%) the complications resulted from surpassing the normal tissue tolerance. To prevent radiation injuries it is suggested to take into consideration the TDF-factor values, while in planning radiotherapy to choose such schedules of irradiation, which preclude any surpassing of the tolerance of normal tissues and organs adjacent to the tumor. 相似文献