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   43744篇
  免费   938篇
  国内免费   180篇
电工技术   573篇
综合类   632篇
化学工业   4793篇
金属工艺   598篇
机械仪表   886篇
建筑科学   838篇
矿业工程   390篇
能源动力   429篇
轻工业   2103篇
水利工程   595篇
石油天然气   50篇
武器工业   4篇
无线电   1885篇
一般工业技术   3547篇
冶金工业   21684篇
原子能技术   211篇
自动化技术   5644篇
  2023年   196篇
  2022年   123篇
  2021年   103篇
  2019年   58篇
  2018年   478篇
  2017年   692篇
  2016年   1070篇
  2015年   784篇
  2014年   439篇
  2013年   438篇
  2012年   2163篇
  2011年   2477篇
  2010年   696篇
  2009年   769篇
  2008年   631篇
  2007年   669篇
  2006年   589篇
  2005年   3369篇
  2004年   2577篇
  2003年   2062篇
  2002年   863篇
  2001年   746篇
  2000年   295篇
  1999年   648篇
  1998年   6265篇
  1997年   3875篇
  1996年   2546篇
  1995年   1478篇
  1994年   1086篇
  1993年   1126篇
  1992年   260篇
  1991年   324篇
  1990年   311篇
  1989年   287篇
  1988年   299篇
  1987年   230篇
  1986年   202篇
  1985年   172篇
  1984年   81篇
  1983年   89篇
  1982年   143篇
  1981年   192篇
  1980年   195篇
  1979年   71篇
  1978年   105篇
  1977年   619篇
  1976年   1331篇
  1975年   99篇
  1973年   49篇
  1971年   50篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
971.
972.

Definition of the problem

This paper deals with the question whether the current German intellectual property right on pharmaceuticals is morally justifiable. To answer this question, I will map the relevant discourse and arrange the different positions with respect to their level of abstraction.

Arguments

I underline that both deontological and consequentialist arguments point out the moral deficits within the system.

Conclusion

The consequentialist position emphasizes the unsatisfying relationship between patented pharmaceutical costs and the number of innovations on the market. The deontological approach on the other hand highlights the dangers to citizens’ autonomy.
  相似文献   
973.
974.

Definition of the problem

The role of stories is well established in the traditions of narrative ethics and casuistry. However, from a methodological point of view, the inclusion of fictional works in moral deliberation remains yet unanswered. The paper explains the potential of dystopias for bioethics by means of selected examples and a critical reconstruction and expansion of existing approaches.

Arguments

By means of literary theories, it is proposed to include moral beliefs that motivate dystopias in coherent reflection and reasoning procedures. Furthermore, dystopia’s potential through socioculturally dense scenarios, a contemporary-historical context, and a sensitization to the moral relevance of language for bioethical research are systematically presented.

Conclusion

The methodological considerations provide, on the one hand, practical points of reference for didactic approaches and, on the other hand, for public deliberation. However, the analysis also shows that dystopias introduce their own moral positions beyond a mere illustration or warning.
  相似文献   
975.

Definition of the problem

The central foundations of successful dental treatment consist of a trustful patient-dentist relationship, the professional and psychosocial expertise of the team treating the patient, and consideration of ethical aspects both during the therapeutic decision-making process and during the subsequent execution of therapy. This is especially true of the dental treatment of (mostly elder) persons with dementia, calling for an in-depth assessment of the various normative implications.

Arguments

In geriatric dentistry in particular, situational dilemmas regarding treatment often arise from specific constellations (e.?g. greatly reduced potential for dental therapy, lack of ability regarding oral hygiene and lack of individual patient responsibility) combined with an acute need for treatment and the necessary involvement of third parties. These dilemmas frequently place additional professional and normative demands on the dentist. The current contribution discusses this specific situation, first by way of theoretical discourse and subsequently with a case-related approach on the basis of two case histories.

Conclusion

It becomes clear here that classic state-of-the-art therapies are replaced by “compromise treatment” in many cases in geriatric dentistry. Such treatment follows divergent diagnostic and therapeutic rules, poses changed requirements in terms of communication and presents specific ethical challenges and pitfalls.
  相似文献   
976.
977.
978.
979.
980.
In order to establish a simple, sensitive, and fast reliable detection method to determine the magnolol, FeWO4 nanoflower was synthesised through a solvothermal technique and FeWO4 nanoflower modified carbon paste electrode (CPE) was developed. The voltammetric behavior of magnolol on the modified electrodes was studied using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and differential pulse voltammetry (DPV). The experimental results showed that the modified electrode remarkably enhanced the electrochemical response of the magnolol and exhibited a wide linear range for determination of the magnolol from 1.0×10-7 to 1.0×10-4 mol/L with a low detection limit of 5.0×10-8 mol/L.  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