全文获取类型
收费全文 | 3310篇 |
免费 | 94篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 59篇 |
化学工业 | 605篇 |
金属工艺 | 129篇 |
机械仪表 | 89篇 |
建筑科学 | 177篇 |
矿业工程 | 7篇 |
能源动力 | 97篇 |
轻工业 | 351篇 |
水利工程 | 16篇 |
石油天然气 | 3篇 |
无线电 | 244篇 |
一般工业技术 | 750篇 |
冶金工业 | 365篇 |
原子能技术 | 85篇 |
自动化技术 | 435篇 |
出版年
2023年 | 23篇 |
2022年 | 27篇 |
2021年 | 40篇 |
2020年 | 33篇 |
2019年 | 35篇 |
2018年 | 54篇 |
2017年 | 58篇 |
2016年 | 70篇 |
2015年 | 56篇 |
2014年 | 69篇 |
2013年 | 145篇 |
2012年 | 126篇 |
2011年 | 146篇 |
2010年 | 121篇 |
2009年 | 124篇 |
2008年 | 129篇 |
2007年 | 125篇 |
2006年 | 101篇 |
2005年 | 96篇 |
2004年 | 75篇 |
2003年 | 89篇 |
2002年 | 99篇 |
2001年 | 83篇 |
2000年 | 74篇 |
1999年 | 88篇 |
1998年 | 159篇 |
1997年 | 101篇 |
1996年 | 80篇 |
1995年 | 63篇 |
1994年 | 52篇 |
1993年 | 42篇 |
1992年 | 26篇 |
1991年 | 41篇 |
1990年 | 42篇 |
1989年 | 35篇 |
1988年 | 32篇 |
1987年 | 29篇 |
1986年 | 21篇 |
1985年 | 34篇 |
1984年 | 36篇 |
1983年 | 21篇 |
1982年 | 35篇 |
1981年 | 26篇 |
1980年 | 34篇 |
1979年 | 30篇 |
1978年 | 27篇 |
1977年 | 21篇 |
1976年 | 42篇 |
1975年 | 21篇 |
1967年 | 18篇 |
排序方式: 共有3412条查询结果,搜索用时 125 毫秒
1.
2.
Abdeljaoued Emna Brulé Mathieu Tayibi Saida Manolakos Dimitris Oukarroum Abdallah Monlau Florian Barakat Abdellatif 《Clean Technologies and Environmental Policy》2020,22(10):1967-1997
Clean Technologies and Environmental Policy - Biochar has caught great attention over the last decade, yielding a large number of publications in a broad range of disciplines. This scientometric... 相似文献
3.
Chris Mathieu 《Creativity & Innovation Management》2006,15(3):242-249
Using a qualitative case study of the transformations of the infrastructure of the Danish film field by the Danish Film Institute and its CEO, three basic questions about entrepreneurial agency are raised. The first deals with the relationship between the institutional environment and the personal backgrounds of entrepreneurial actors. The study finds that certain actors can be seen as possessing extreme or unique levels of legitimacy resulting in being rewarded with tremendous resources and opportunities for strategic action. The second question has to do with how, and what sort of role transformations can take place from a structurally central, but static position in a field. Here ‘intermediary entrepreneurialism’ was used to penetrate and integrate the field in such a way as to turn a structurally fixed position from a weak to a strong nexus. The third question deals with how transformations can be effected by an organization that straddles three prominent institutional fields and logics – the state, market and artistic expression. Here, the key role of the term ‘professionalization’ is emphasized, arguing that this term proved evocative and compelling in each institutional field. The case also adds to our understanding of institutional and transformation processes in creative industries by focusing on two less‐studied contexts – the role and strategies of centrally placed actors in initiating and leading transformational activities, and the role that entrepreneurial ‘bureaucrats’ can play in transforming creative industries. 相似文献
4.
Th. Heins 《e & i Elektrotechnik und Informationstechnik》2003,120(11):400-401
An enterprise is not just a tall shiny building or a collection of facilities. Rather, it is the sum of individuals collectively engaged in a common pursuit. From an information and communications perspective, this realization changes everything. By looking at the enterprise as a boundary-less collection of individuals who sometimes work in an office, sometimes at home, and sometimes on the road, we need new communications concepts designed to work with and enhance our complex home and work lives. 相似文献
5.
F Koumanov C Henry C Ghezzi JP Mathieu C Morin M Vidal J de Leiris M Comet D Fagret 《Canadian Metallurgical Quarterly》1997,24(6):519-525
Two anomeric analogues of glucose labelled with 123 iodine in position 6, proposed as tracers of glucose transport in vivo, have been synthesized: alpha- and beta-methyl-6-deoxy-6-iodo-D-glucopyranoside (alpha MDIG and beta MDIG). The aim of this study was to determine whether these molecules interact with the glucose transporter and whether they could be used as tracers of glucose transport in vivo. The biodistribution of alpha MDIG and beta MDIG was studied in the mouse in vivo. To determine if these two anomers enter the cell via the glucose transporter, their uptake was measured in isolated perfused rat hearts, in human erythrocytes in suspension, and in cardiomyocytes of neonatal rat in culture. Both alpha MDIG and beta MDIG had similar repartitions in the mouse: myocardial uptake averaged 7% of the injected dose/g of organ at 2 min postinjection and alpha MDIG competed with D-glucose to enter the cells. Insulin produced a 123% increase of its uptake in isolated perfused rat hearts and a 100% increase in cardiomyocytes of neonatal rat in culture. alpha MDIG uptake was lowered in the presence of glucose transport inhibitors in each experimental model. An interaction between beta MDIG and glucose transporters was observed only in human erythrocytes in suspension. Only alpha MDIG interacts with the glucose transporter, and thus could be used to estimate glucose transport in vivo. 相似文献
6.
7.
8.
G. Bognár und Th. Forgács 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1938,76(6):535-538
Zusammenfassung Wir haben die für die Abfüllung von Milchprodukten benützten Kartonpapiersorten auf ihren Nitratgehalt untersucht. Die untersuchten Kartonsorten zeigten schwankenden, aber unbedeutenden Nitratgehalt, der in erster Linie von den verschieden hohen Nitratgehalten der Fabrikationswässer abhängig ist. In den untersuchten Fällen wurde die Aufnahme von Nitraten durch Sauerrahm aus solchen paraffinierten Kartonbechern nachgewiesen. Die Herkunft dieser weit über den ursprünglichen Nitratgehalt der Kartons hinausgehenden Nitratmenge lag in dem zur Herstellung der Becher benützten, stark nitrathaltigen Stärkekleister. In solchen Fällen fallen somit die an die Nitratreaktion geknüpften Folgerungen (Wässerung, Verschmutzung) weg. Daher ist bei der Beurteilung der Milchprodukte auf Grund der Nitratreaktion auf diesen Umstand acht zu geben.Da solche Kartonbehälter auch zur Abfüllung anderer Lebensmittel verwendet werden (Honig, Senf, Marmelade usw.), behalten wir uns vor, unsere Untersuchungen auch auf dieses Gebiet auszudehnen. 相似文献
9.
10.