全文获取类型
收费全文 | 348篇 |
免费 | 6篇 |
专业分类
电工技术 | 3篇 |
综合类 | 1篇 |
化学工业 | 78篇 |
金属工艺 | 3篇 |
机械仪表 | 6篇 |
建筑科学 | 23篇 |
能源动力 | 5篇 |
轻工业 | 18篇 |
无线电 | 6篇 |
一般工业技术 | 68篇 |
冶金工业 | 114篇 |
原子能技术 | 2篇 |
自动化技术 | 27篇 |
出版年
2022年 | 5篇 |
2021年 | 4篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 4篇 |
2013年 | 12篇 |
2012年 | 7篇 |
2011年 | 4篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 11篇 |
2003年 | 5篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 8篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 12篇 |
1979年 | 5篇 |
1978年 | 8篇 |
1977年 | 10篇 |
1976年 | 9篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1972年 | 5篇 |
1971年 | 5篇 |
1970年 | 5篇 |
1968年 | 3篇 |
排序方式: 共有354条查询结果,搜索用时 0 毫秒
1.
2.
In the present investigation it has been shown exemplarily for an austenite microstructure containing carbonitrides that the specific restraining force of a grain boundary due to the distribution of precipitates can be described by a modified Orowan's law, so that the grain boundary movement is considered to be analogous to the dislocation movement. This is achieved by using a modified restraining force Fr (corresponding to the cubic geometry of the particles), a detailed thermodynamic analysis of the precipitates (in this case, carbonitrides) and selected relation for the interparticle spacing La. The specific restraining force and the interparticle spacing depend on temperature within the austenite range. Each temperature is attached to a couple (Fr/La). The plot Fr against shows straight lines for each steel and from their average slope, a shear module G' of grain boundaries, which is about 64300 N·cm?2, is obtained. Hence, it is possible to describe the specific restraining force of a grain boundary with the help of Orowan's law or as it is conventionally done by using Zener's modell. At a critical temperature T*, which is different for each steel, the specific restraining force is equal to the driving force of the grain boundary. The corresponding values of La are also different for each steel and the steel which is the most resistant to grain coarsening is allowed to have the greatest value of La which still retains the capacity of impeding grain coarsening. 相似文献
3.
4.
5.
Ferry Dharmawan Rodney S. Thomson Henry Li Israel Herszberg Evan Gellert 《Composite Structures》2004,66(1-4):181-187
The structural integrity and damage tolerance of typical composite T-joints found in ships constructed from glass fibre reinforced plastic was the subject of this investigation. The effect of the geometry of the T-joint on the strain distribution was investigated using finite element (FE) analysis. The results, reported in this paper, showed that the critical strains were significantly affected by the joint geometry. Results of the FE analysis conducted to investigate the effect of disbonds between the filler and overlaminate are also reported. This showed that particular defects led to large changes in the strains in the T-joint structure, which would encourage disbond progression. The FE model was validated by mechanical tests on a representative T-joint, instrumented with surface strain gauges and displacement transducers, into which a range of defects was progressively introduced. 相似文献
6.
Definition of the problem
The concept of “ethics” has recently been incorporated into both the 2014 Model Professional Code for Dentists and the current version of the “National Competence-Based Catalog of Learning Objectives in Dental Medicine” (NKLZ, Nationaler Kompetenzbasierter Lernzielkatalog Zahnmedizin). The study presented here addresses the question which relevance this has for the relevance of the new concept accomplished for the dental profession and society.Arguments
To this end, the societal processes that are related to the autonomous freedom of action of the dental profession are discussed. Therefore the sociological fields of discourse such as profession (and the effect of its constitutive antinomies), trust, education, expertise, practice of treatments and sanction are reviewed for their potential of having connections to each other and serving as a structural frame concerning an ethically reflected acting of the professional. The basis of the professional freedom of action is the trust of society and the individual patient in the professionally acting dentist.Conclusion
The study arrives at the conclusion that it was a serious omission for many decades not to make young dentists aware of the ethical foundations of dental activity on an institutionally established basis and thus failing to encourage them to constantly reflect their professional expertise in relation to the problems to be solved. This deficit has now been identified. It is absolutely essential to implement an institutionalized structure dealing with ethical questions within the scope of dental medicine.7.
Winfried Stute 《TEST》2001,10(2):393-403
In this paper we provide consistency and distributional convergence results for functions of residuals from an ARCH(p)-time series. An application to a goodness-of-fit problem is also discussed. 相似文献
8.
Dipl.-Inf. Sonja Zaplata Dr. Christian P. Kunze Prof. Dr. Winfried Lamersdorf 《WIRTSCHAFTSINFORMATIK》2009,51(4):347-362
Realistic requirements of mobile business applications often exceed the capabilities of their respective local environments. In order to overcome such restrictions of specific mobile devices, services, and resources, this contribution introduces the concept of context-based cooperation. It is based on mobile processes which enable applications to cross boundaries of individual systems and thereby allow combining both mobile and stationary resources in order to realize highly dynamic individual applications. This contribution presents an approach for realizing context-based cooperation built upon on a respective context management infrastructure and execution environment. It also identifies specific requirements and proposes related enhancements for mobile business applications. 相似文献
9.
Bestimmung von Streckgrenze und Zugfestigkeit beim Ziehen und Walzen von Stahldrähten mit Kohlenstoffgehalten zwischen 0,006 und 0,6%. Einfluß des Wechsels der Verformungsart vom Ziehen zum Walzen auf den weiteren Anstieg der Festigkeitswerte. Anfänglicher Abfall der Festigkeitswerte vor allem bei patentierten Stahldrähten mit höherem Kohlenstoffgehalt. Deutung des Festigkeitsabfalles als Zerstörung der bei der Verformung aufgetretenen Alterung und Änderung der gerichteten Eigenspannungen zwischen den verschiedenen Phasen. 相似文献
10.
Simulation eines pfannenmetallurgischen Stahlraffinationsverfahrens unter Verwendung von Cer-Mischmetall, einer Raffinationsschlacke und Argonspülung zur Reinheitsgradverbesserung. Darstellung typischer nichtmetallischer Einschlüsse. Aufzeigen der erzielten Zähigkeitsverbesserungen und der Verringerung der Zähigkeitsanisotropie. 相似文献