全文获取类型
收费全文 | 1059篇 |
免费 | 1篇 |
专业分类
化学工业 | 4篇 |
金属工艺 | 1篇 |
能源动力 | 2篇 |
轻工业 | 4篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
一般工业技术 | 3篇 |
冶金工业 | 1036篇 |
自动化技术 | 7篇 |
出版年
2021年 | 1篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2015年 | 1篇 |
2013年 | 1篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2003年 | 3篇 |
1999年 | 34篇 |
1998年 | 327篇 |
1997年 | 162篇 |
1996年 | 125篇 |
1995年 | 56篇 |
1994年 | 69篇 |
1993年 | 71篇 |
1992年 | 5篇 |
1991年 | 12篇 |
1990年 | 12篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1987年 | 8篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 9篇 |
1980年 | 13篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 33篇 |
1976年 | 64篇 |
1975年 | 3篇 |
1954年 | 2篇 |
排序方式: 共有1060条查询结果,搜索用时 0 毫秒
911.
912.
913.
M Huguier JM Lancret PF Bernard C Baschet F Le Henand 《Canadian Metallurgical Quarterly》1976,63(9):704-708
In 181 patients six reconstructive procedures were performed after total gastrectomy: Roux-en-Y (95), Henley (42), omega (21), Tomoda (16, Rosanov (4) and neogastrium (3). The functional results 2-4 months after operation were studied and compared by medical observers independently of the surgeons who had selected and performed the reconstructive procedures. Analysis of the functional results, and consideration of the degree to which the functional disorders associated with the various reconstructive procedures lend themselves to treatment, suggest that the Henley reconstructive procedure is the best, with the Roux-en-Y as a good second-best. 相似文献
914.
915.
916.
917.
JS Althaus TJ Fleck DA Becker ED Hall PF Vonvoigtlander 《Canadian Metallurgical Quarterly》1998,24(5):738-744
We present analytical and neuroprotective data on a unique spin trapping agent derived from a novel chemical class known as an azulenyl nitrone (AZN). Based on Colorimetric properties, AZN was used to assess the formation of free radicals in a bilateral carotid occlusion (BCO) model in gerbils by monitoring the conversion of the nitrone to the aldehyde in affected tissue. In addition, AZN was tested as a neuroprotectant in this model regarding the preservation of CA1 pyramidal cells of the hippocampus following transient ischemia/reperfusion. AZN was electrochemically oxidized to give the aldehyde using an HPLC system with on line electrochemical oxidation. The oxidation potential associated with a 50% loss of AZN occurred at about 600 mV (half-wave potential versus palladium electrode). The major product detected as AZN oxidation occurred in an aqueous methanolic medium was the corresponding azulenyl aldehyde. Oxidation of AZN was inversely related to the formation of the aldehyde. Based on this test, we considered the in vivo conversion of AZN to aldehyde to be a measurement of oxidative stress in tissue. Results show that 0.3% of hippocampal AZN was converted to aldehyde in animals treated as shams. However, in gerbils subjected to a 7-min ischemic insult plus 7-min reperfusion, the conversion rate was about 3 times higher at 1.0%. In this model, surviving CA1 hippocampal neurons were counted from gerbils that were subjected to 7 mins of BCO followed by 5 days of reperfusion. In sham animals, about 89 cells were counted in a selected field of CA1 neurons. With injury, only 27 cells on average survived (70% loss) and were counted from this selected field. Under similar conditions and AZN treatment, 57 cells survived (36% loss). We conclude, therefore, that the demonstrated neuroprotection occurs because AZN neutralizes radicals which contribute to neuronal damage following ischemia/reperfusion. 相似文献
918.
919.
Association of the FcepsilonRIbeta gene with bronchial hyper-responsiveness in an Italian population
E Trabetti V Cusin G Malerba LC Martinati A Casartelli AL Boner PF Pignatti 《Canadian Metallurgical Quarterly》1998,35(8):680-681
A study of two DNA polymorphisms (i2 RsaI, E237G) in the gene for the beta subunit of the IgE high affinity receptor (FcepsilonRIbeta) was performed in 168 Italian families with atopic asthmatic children. The prevalence of the E237G allele in the Italian population was 4%, so this polymorphism was unsuitable for this study. The i2 RsaI polymorphism minor allele frequency was 44%, and it had a PIC value of 0.37. Linkage analysis indicated a significant allele sharing in affected sib pairs for bronchial hyper-responsiveness (BHR, p=0.048), but not for allergic asthma. These data indicate an association of bronchial hyper-responsiveness with the FcepsilonRIbeta gene. 相似文献
920.