全文获取类型
收费全文 | 16811篇 |
免费 | 2143篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 1358篇 |
综合类 | 403篇 |
化学工业 | 8487篇 |
金属工艺 | 245篇 |
机械仪表 | 374篇 |
建筑科学 | 641篇 |
矿业工程 | 167篇 |
能源动力 | 89篇 |
轻工业 | 1694篇 |
水利工程 | 128篇 |
石油天然气 | 68篇 |
无线电 | 328篇 |
一般工业技术 | 2824篇 |
冶金工业 | 146篇 |
原子能技术 | 24篇 |
自动化技术 | 1982篇 |
出版年
2023年 | 619篇 |
2022年 | 306篇 |
2021年 | 659篇 |
2020年 | 658篇 |
2019年 | 565篇 |
2018年 | 544篇 |
2017年 | 377篇 |
2016年 | 600篇 |
2015年 | 773篇 |
2014年 | 801篇 |
2013年 | 1375篇 |
2012年 | 514篇 |
2011年 | 390篇 |
2010年 | 750篇 |
2009年 | 908篇 |
2008年 | 399篇 |
2007年 | 368篇 |
2006年 | 265篇 |
2005年 | 260篇 |
2004年 | 212篇 |
2003年 | 203篇 |
1998年 | 176篇 |
1997年 | 135篇 |
1996年 | 195篇 |
1995年 | 182篇 |
1994年 | 156篇 |
1993年 | 219篇 |
1992年 | 152篇 |
1991年 | 121篇 |
1990年 | 151篇 |
1989年 | 173篇 |
1988年 | 136篇 |
1987年 | 161篇 |
1986年 | 182篇 |
1985年 | 164篇 |
1984年 | 167篇 |
1983年 | 175篇 |
1982年 | 156篇 |
1981年 | 202篇 |
1980年 | 165篇 |
1979年 | 170篇 |
1977年 | 147篇 |
1976年 | 149篇 |
1975年 | 202篇 |
1974年 | 188篇 |
1973年 | 365篇 |
1972年 | 212篇 |
1971年 | 150篇 |
1970年 | 144篇 |
1968年 | 153篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Prof. Dr. jur. Christian Kopetzki 《Ethik in der Medizin》2004,16(3):275-287
Definition of the problem: In Austria the legal discussion on initiating and withdrawing artificial nutrition in incompetent patients has just begun. Arguments and conclusion: Legal regulations are lacking, but there appears to be agreement on accepting advance directives under specific criteria. This would mean that a presumed will and documented refusal of treatment and nutrition has to be respected by physicians. However, there is no consensus with regard to the “supposed will” of an incompetent patient to refuse treatment and nutrition. At present, surrogate decision making with regard to refusing life-sustaining treatment or nutrition is only accepted according to a declared and documented directive of the patient himself. When the patient’s will has to be “surmised” the protection of life has priority. In Austria this concept is based on the national constitution and its duty to protect life. 相似文献
92.
The following paper demonstrates that programmed sequential graph grammars can be used in a systematic proceeding to specify the changes of high level intermediate data structures arising in a programming support environment, in which all tools work in an incremental and syntax-driven mode. In this paper we lay stress upon the way to get the specification rather than on the result of this process. Therefore, we give here some approach to “specification engineering” using graph grammars. This approach is influenced by the syntactical definition of the underlying language for Programming in the Small, the module concept etc. to be supported on one side but also by the idea of the user interface. 相似文献
93.
94.
95.
96.
97.
98.
99.
100.
Dipl.-Wirt.Inf. Christian Czarnecki Prof. Dr. Axel Winkelmann Prof. Dr. rer.nat./Griechenland habil. Myra Spiliopoulou 《WIRTSCHAFTSINFORMATIK》2013,55(2):83-97
The telecommunication market is experiencing substantial changes. New business models, innovative services, and technologies require reengineering, transformation, and process standardization. Enterprise Architecture Frameworks support the transformation by specifying methods, procedures, and reference models. With the Enhanced Telecom Operation Map (eTOM), the TM Forum offers an international de facto reference process framework, based on specific features and requirements of the telecommunication industry. However, this reference framework only offers a hierarchical collection of processes on different levels of abstraction; a control view in terms of a sequential ordering of tasks and hence a real process flow as well as an end-to-end view on the customer are missing. In this paper, we extend the eTOM reference model by reference process flows, in which we abstract and generalize the knowledge about processes in telecommunication companies. With reference process flows, we aim to assist companies in achieving a structured and transparent re-structuring and re-design of their processes. We demonstrate the applicability and usefulness of our reference process flows in two case studies, and evaluate them by means of criteria for reference model evaluation. Our reference process flows have been accepted as a standard by the TM Forum and published as part of eTOM version 9. We further elaborate on those components of our approach which can be applied outside the telecommunication industry. 相似文献