全文获取类型
收费全文 | 146篇 |
免费 | 1篇 |
专业分类
化学工业 | 31篇 |
机械仪表 | 1篇 |
建筑科学 | 7篇 |
能源动力 | 7篇 |
轻工业 | 3篇 |
水利工程 | 1篇 |
无线电 | 18篇 |
一般工业技术 | 11篇 |
冶金工业 | 51篇 |
自动化技术 | 17篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2014年 | 2篇 |
2013年 | 10篇 |
2012年 | 1篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 4篇 |
1999年 | 4篇 |
1998年 | 16篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 1篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1972年 | 2篇 |
1965年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1956年 | 2篇 |
排序方式: 共有147条查询结果,搜索用时 93 毫秒
1.
Denaturing gradient gel electrophoresis revealed changes in the bacterial species obtained from enrichment cultures with different inoculum dilutions. This inoculum dilution enrichment approach may facilitate the detection and isolation of a greater number of bacterial species than traditional enrichment techniques. 相似文献
2.
Usha Varshney R. J. Churchill H. P. Groger A. I. Kingon 《Journal of Superconductivity》1989,2(2):293-304
Recent advances in the fabrication of high-T
c
superconducting thick films demand processing techniques which can eliminate film/substrate interdifiusion that occurs during subsequent post-annealing heat treatment after the film is deposited, thereby limiting the application of the thick films for devices. The present study evaluates laser annealing techniques for plasma-deposited Y-Ba-Cu-O thick films using a high-energy CO2 laser (10.6m) in a continuous wave mode. The results are compared with those obtained by conventional furnace annealing techniques necessary for post-heat treatment of as-deposited superconducting thick films. The high-T
c
superconducting phase is recovered by cationic diffusion during subsequent post-annealing heat treatment. Crystallographic phases and microstructural characterization have been performed using XRD, SEM, and EPMA analytical techniques. The significance of the technology lies in the elimination of film/substrate interdiffusion problems, thereby resulting in high-quality superconducting thick films. The technology will significantly reduce the post-annealing times usually required by conventional furnace annealing techniques. 相似文献
3.
4.
This paper reports on a case study of a teacher from a technical education institution who explored the educational affordances of PDA technology over a period of six months. Based on this teacher’s perspectives, the study was designed to inform our own understanding of educational affordances of this new and emerging technology. Understanding of educational affordances is important in the context of planning a suitable intervention to support pedagogically effective integration of PDA technology. The study explicated a set of five affordances of PDA technology: as a multimedia-access tool, connectivity tool, capture tool, representational tool and analytical tool. We call on further research to expand this set into a more comprehensive collage of educational affordances of PDA technology. 相似文献
5.
EL Wallace DM Surgenor HS Hao J An RH Chapman WH Churchill 《Canadian Metallurgical Quarterly》1993,33(2):139-144
A poor response to L-DOPA in addition to parkinsonian, cerebellar, and autonomic signs is commonly regarded as indicative of clinical multiple system atrophy (MSA). We compared the motor response to a single oral administration of 250 mg L-DOPA/25 mg carbidopa in eight MSA patients and eight Parkinson's disease (PD) patients with the "on-off" phenomenon, evaluating L-DOPA peripheral pharmacokinetics. Motor response was consistently good in all PD patients, but only four MSA patients had a (moderate) response. Pharmacokinetic parameters did not differ between the groups. The varying extent of putaminal damage could be responsible for the differing motor response to L-DOPA in MSA patients. 相似文献
6.
7.
8.
9.
Andrew Churchill 《Information Security Technical Report》2009,14(3):131-137
In recent years the repeated compromise and loss of personal information, from a variety of sources, both public and private, have led to the issue of privacy being increasingly in the public eye. Concurrently public policy developments in line with the UK's Transformational Government agenda have led to ever greater amounts of personal information being made available electronically, and with greater levels of access being explored in order to exploit greater efficiencies in the delivery of public services. Such a rise in both public concern of the security of their data and the levels of access being afforded to improve efficiency has sometimes been seen as dichotomous. This article looks at some of these underlying concerns to suggest some of the issues that need to be addressed when considering privacy in a public policy context, and examines the dangers of retrofitting privacy as an afterthought, and hence the importance of privacy by design. 相似文献
10.