首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2042篇
  免费   63篇
  国内免费   2篇
电工技术   27篇
综合类   5篇
化学工业   351篇
金属工艺   40篇
机械仪表   30篇
建筑科学   189篇
矿业工程   12篇
能源动力   55篇
轻工业   165篇
水利工程   17篇
石油天然气   8篇
武器工业   1篇
无线电   235篇
一般工业技术   347篇
冶金工业   182篇
原子能技术   17篇
自动化技术   426篇
  2023年   9篇
  2022年   19篇
  2021年   40篇
  2020年   28篇
  2019年   34篇
  2018年   33篇
  2017年   52篇
  2016年   50篇
  2015年   28篇
  2014年   72篇
  2013年   165篇
  2012年   99篇
  2011年   115篇
  2010年   106篇
  2009年   117篇
  2008年   127篇
  2007年   123篇
  2006年   127篇
  2005年   106篇
  2004年   100篇
  2003年   80篇
  2002年   57篇
  2001年   45篇
  2000年   38篇
  1999年   37篇
  1998年   33篇
  1997年   43篇
  1996年   37篇
  1995年   19篇
  1994年   19篇
  1993年   13篇
  1992年   11篇
  1991年   12篇
  1990年   12篇
  1989年   7篇
  1987年   12篇
  1986年   3篇
  1985年   4篇
  1984年   7篇
  1983年   7篇
  1982年   4篇
  1981年   7篇
  1980年   8篇
  1978年   4篇
  1977年   7篇
  1976年   7篇
  1975年   4篇
  1969年   2篇
  1925年   3篇
  1904年   2篇
排序方式: 共有2107条查询结果,搜索用时 15 毫秒
61.

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.
  相似文献   
62.
63.
64.
Thelwall  Mike  Nevill  Tamara 《Scientometrics》2019,121(3):1793-1801
Scientometrics - The lack of females in many Science Technology, Engineering and Mathematics (STEM) subjects in the USA is an ongoing concern, with many initiatives attempting to redress this...  相似文献   
65.
Young men from poorer backgrounds are associated with high road traffic collision levels. However, solving this problem has proven very difficult. Hence this paper summarises the findings of a UK government funded two-year trial of a cross-discipline intervention to reduce aggressive driving amongst this group.  相似文献   
66.
Thelwall  Mike  Kousha  Kayvan  Abdoli  Mahshid 《Scientometrics》2017,112(1):509-527
Scientometrics - Citation-based indicators are often used to help evaluate the impact of published medical studies, even though the research has the ultimate goal of improving human wellbeing. One...  相似文献   
67.
Adapting and changing the systems and technologies involved in civic engagement with local government is among the key challenges of collaborative technologies for political participation. In such contexts, both existing sets of technologies and ingrained, often formalised practices, the ‘rules of the game’, constrain any opportunity for intervention. Additionally, ‘civic’ and expert groups with conflicting agendas and divergent demands on public choices assert their influence in these transformation programmes. The article argues that established methods in collaborative systems design have thus far overlooked the role of recurring actions involved in public participation as well as the formal rules and ingrained practices that construct them. Yet, such patterns present a valuable resource for design interventions. Thus, based on an institutional approach, the article outlines a methodology for requirement gathering by mapping the relations of actors, software and their use along identifiable action situations. The method called for a dialogue between socio-technical-spatial contexts of public service and specific actions taking place within it. Drawing on a case of organising civic engagement in urban planning, the article discusses how to find and trace existing practices across social settings, information technologies and material contexts where engagements take place. The approach underscores the existing institutional contexts in inspiring, opening and constraining the opportunities to support ‘civics’.  相似文献   
68.
We propose an exact mathematical mapping that can be useful for making an analog quantum simulator that uses ion-based systems to realize the many-body electron–electron Coulomb interaction of an electron gas. This exact mathematical mapping allows us to deal with a system that is difficult to solve and control using a potentially more experimentally feasible setup. We show that ions can efficiently simulate electronic Coulomb interactions by using a unitary dilatation transform. The transformation does not need to be physically implemented if only the energy spectrum is desired, eliminating the complexity overhead. This proposal works in any number of dimensions and could be used to simulate different topological phases of electrons in graphene-like structures, by using ions confined in honeycomb lattices.  相似文献   
69.
70.
The implementation of synthetic guided wave focusing to locate axially aligned defects in pipes has been investigated. Results from both finite element computer models and experiments on real pipes are presented and the data show good agreement. Focusing is necessary to improve the reflection coefficient from axially aligned defects, as the signals are very weak. The Common Source Method (CSM) of synthetic focusing has been applied which makes it possible to apply focusing via post processing to previously collected data. The dependence of reflection coefficient on crack length was measured for both through thickness and part depth axially aligned defects, at a range of frequencies, using the torsional guided wave family. The results show that the reflection coefficient is approximately doubled when focusing is employed, compared to the sensitivity for unfocused fundamental torsional waves. However the sensitivity is still very low, so in practise this approach could only be used to find severe defects.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号