全文获取类型
收费全文 | 82篇 |
免费 | 2篇 |
专业分类
化学工业 | 17篇 |
金属工艺 | 2篇 |
水利工程 | 1篇 |
无线电 | 12篇 |
一般工业技术 | 5篇 |
冶金工业 | 29篇 |
原子能技术 | 1篇 |
自动化技术 | 17篇 |
出版年
2017年 | 2篇 |
2016年 | 2篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2011年 | 1篇 |
2010年 | 2篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 8篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 5篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1983年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有84条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
Competition, in the form of survival of the fittest, has been around far longer than humans, but humans are unique in setting up artificial competitions and awarding prizes for success. The Olympic Games is perhaps the oldest competition that continues to this day (albeit with a hiatus of two millennia), though no doubt it wasn't the first. Technological competitions are more recent but not young. 相似文献
25.
C. R. Becker V. Latussek G. Landwehr R. Bini L. Ulivi 《Journal of Electronic Materials》2005,34(6):811-814
The optical absorption coefficient of HgTe/Hg0.3Cd0.7Te superlattices (SLs) and its pressure dependence has been investigated at hydrostatic pressures up to 30 kbar at room temperature.
The corresponding intersubband transition energies result from a comparison of experimental and theoretical absorption coefficients.
The latter is based on the band structure, which is calculated using Kane’s four-band (8×8 k · p) model together with the
envelope function approximation. The experimental linear pressure coefficients of the H1 — E1 and H1 — L1 intersubband transitions
are in good agreement with the theoretical values, e.g., 7.15±0.3 meV/kbar and 6.2±0.3 meV/kbar compared to 7.4 and 6.4 meV/kbar,
respectively. this is in stark contrast to the pressure dependence of ≤1 meV/kbar of the photoluminescence (PL) peaks of a
similar SL reported in the literature. Consequently, we conclude that the reported PL peaks are not due to intersubband transitions
and that the k · p model correctly reproduces the electronic band structure and its pressure dependence of HgTe/Hg1−xCdxTe SLs. 相似文献
26.
We develop a general theoretical framework for statistical logical learning with kernels based on dynamic propositionalization,
where structure learning corresponds to inferring a suitable kernel on logical objects, and parameter learning corresponds
to function learning in the resulting reproducing kernel Hilbert space. In particular, we study the case where structure learning
is performed by a simple FOIL-like algorithm, and propose alternative scoring functions for guiding the search process. We
present an empirical evaluation on several data sets in the single-task as well as in the multi-task setting. 相似文献
27.
Basic concepts and taxonomy of dependable and secure computing 总被引:33,自引:0,他引:33
Avizienis A. Laprie J.-C. Randell B. Landwehr C. 《Dependable and Secure Computing, IEEE Transactions on》2004,1(1):11-33
This paper gives the main definitions relating to dependability, a generic concept including a special case of such attributes as reliability, availability, safety, integrity, maintainability, etc. Security brings in concerns for confidentiality, in addition to availability and integrity. Basic definitions are given first. They are then commented upon, and supplemented by additional definitions, which address the threats to dependability and security (faults, errors, failures), their attributes, and the means for their achievement (fault prevention, fault tolerance, fault removal, fault forecasting). The aim is to explicate a set of general concepts, of relevance across a wide range of situations and, therefore, helping communication and cooperation among a number of scientific and technical communities, including ones that are concentrating on particular types of system, of system failures, or of causes of system failures. 相似文献
28.
29.
30.