全文获取类型
收费全文 | 637篇 |
免费 | 8篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 79篇 |
金属工艺 | 9篇 |
机械仪表 | 9篇 |
建筑科学 | 46篇 |
矿业工程 | 7篇 |
能源动力 | 21篇 |
轻工业 | 55篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 52篇 |
一般工业技术 | 100篇 |
冶金工业 | 131篇 |
原子能技术 | 10篇 |
自动化技术 | 117篇 |
出版年
2023年 | 4篇 |
2021年 | 11篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 5篇 |
2015年 | 8篇 |
2014年 | 10篇 |
2013年 | 60篇 |
2012年 | 34篇 |
2011年 | 23篇 |
2010年 | 23篇 |
2009年 | 20篇 |
2008年 | 38篇 |
2007年 | 28篇 |
2006年 | 26篇 |
2005年 | 26篇 |
2004年 | 17篇 |
2003年 | 28篇 |
2002年 | 20篇 |
2001年 | 20篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 30篇 |
1997年 | 11篇 |
1996年 | 14篇 |
1995年 | 16篇 |
1994年 | 5篇 |
1993年 | 11篇 |
1992年 | 11篇 |
1991年 | 11篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1981年 | 5篇 |
1979年 | 3篇 |
1977年 | 5篇 |
1969年 | 2篇 |
1941年 | 2篇 |
1940年 | 2篇 |
1909年 | 2篇 |
1906年 | 3篇 |
1904年 | 2篇 |
1902年 | 2篇 |
1898年 | 2篇 |
排序方式: 共有647条查询结果,搜索用时 203 毫秒
31.
Ed Tallent 《国际互联网参考资料服务季刊》2013,18(4):201-207
SUMMARY Establishing meaningful connections to faculty is a continuing challenge for academic librarians. One library's efforts at faculty outreach received unexpected assistance from the Internet, when faculty and student curiosity about this resource created opportunities for new library staff to build connections to faculty and establish their credibility on campus. In the process, the library made progress towards meeting another challenge: determining the role of the Internet in the library. Internet instruction is now integrated with library instruction and is available to faculty and students in a variety of formats. 相似文献
32.
Ivar Jacobson Shihong Huang Mira Kajko-Mattsson Paul McMahon Ed Seymour 《Programming and Computer Software》2012,38(1):1-12
The purpose of writing this Three Year Vision paper is threefold. Firstly, it briefly recaps the progress Semat has made thus
far; secondly, it lays out the future directions for people working actively within the Semat community; thirdly, it provides
the background for seeking funding support from agencies, such as the European Community and the like. Funding support is
necessary to sustain the ongoing activities of Semat and its growth into a broader community effort, as most people working
within Semat are volunteers. As such, the paper may be both too much and too little for the wider supporter base. However,
we intend to make our work fully transparent, hence, we publish it widely. We seek feedback and comments from supporters and
signatories in order to improve the vision. In this context, other companion papers are being written to better address the
specific needs for the practitioners, the industry and the academia. 相似文献
33.
34.
Giovanni Rinaldi George Crossley Ed Mackay Ian Ashton Max Campbell Tim Wood Lars Johanning 《国际能源研究杂志》2019,43(13):7316-7335
The Maldives is a group of tropical atolls, considered globally to be one of the most desirable holiday destinations. There is an urgent requirement to decrease their dependency on fossil fuels that are currently the main source of energy, and a number of renewable energy alternatives are being evaluated. Among these, due to the favorable oceanographic and bathymetric conditions, ocean thermal energy conversion (OTEC) systems represent a viable opportunity for clean and reliable power. However, the stresses the OTEC platform will need to endure during adverse environmental conditions are not well defined. The magnitude of these stresses will then have a direct influence on the design of the OTEC device. In order to overcome this uncertainty, this paper uses hindcast data sets from global weather and ocean models to assess the metocean conditions of the Maldives, with particular reference to extreme conditions. After selecting a suitable location for the deployment of the devices, return values calculated using the peaks‐over‐threshold (POT) methodology are estimated for wind, waves, and currents. The 100‐year return value for the significant wave height is found to be 4.5 m, with a joint occurrence of energy periods between 7.5 and 8.5 seconds, whereas the 100‐year return wind has a velocity of 17.8 m/s and the 100‐year return current of 1.9 m/s. The directionality of these extreme events is also considered, showing the southern and western sub‐quadrants as the prevailing sources, which provides essential information for positioning of the platform. Additional evaluations of tropical revolving storms (TRS) and variations in temperature and salinity patterns are also provided over a 1500‐m water column; temperature varies by approximately 24°C, and salinity by around 2 ppt, showing the suitability of OTEC platforms in the Maldives. This work is therefore of interest to offshore renewable energy stakeholders interested in developing a project in the Maldives or those conducting an analogous analysis in other locations. 相似文献
35.
36.
Simon Rendel Ian Thompson Paul Gough Andrew Cherrill Joshua Pollard Ed Bennis 《Landscape Research》1997,22(2):225-235
Landscape Transformed
London, Academy Editions, 1996, 112 pp., no price given, ISBN 1-85490-452-3
Sculpting with the Environment: a natural dialogue
Baile Oakes (Ed.)
New York, Van Nostrand Reinhold, 1995, ISBN 0-442-01642-5, 252 pp., £45.00, hb.
After the Ruins: restoring the countryside of Northern France after the Great War
Hugh Clout
Exeter, University of Exeter Press, 1996, ISBN 0-85989-491-6,332 pp., £35.
Environmental Aesthetics: ideas, politics and planning
J. Douglas Porteous
London and New York, Routledge, 1996, ISBN 0-415-13769-1, 20 pp., £15.99.
Countryside Survey 1990 Main Report
C.J. Barr, R.G.H. Bunce, R.T. Clarke, R.M. Fuller, M.T. Furse, M.K. Gillespie, G.B. Groom, C.J. Hallam, M. Hornung, D.C. Howard & M.J. Ness
London, Department of the Environment, 1993, 174 pp., £12.00 (available from DoE Publications Sales Unit, Block 3, Spur 2, Government Buildings, Lime Grove, Eastcote, HA4 8SE)
World of Environmental Design, Volume 1: Urban Spaces I (Streets and Squares)
Francisco Asenio Cerver
Barcelona, Arco Editorial, 1995, 255 pp., US$75 (per volume) ISBN 84-8185-004-7 (complete work), ISBN 84-8185-005-5 (Volume 1)
'The Remains of Distant Times': archaeology and the National Trust
David Morgan Evans, Peter Salway & David Thackray (Eds)
Woodbridge, Suffolk, The Boydell Press, 1996, ISBN 0-85115-671-1, hb, 235 pp., £29.50
Apostle of Taste: Andrew Jackson Downing 1815-1852
D. Schuyler
Baltimore, fohns Hopkins University Press, 1996, ISBN 0-8018-5229-3, $35.95 相似文献
London, Academy Editions, 1996, 112 pp., no price given, ISBN 1-85490-452-3
Sculpting with the Environment: a natural dialogue
Baile Oakes (Ed.)
New York, Van Nostrand Reinhold, 1995, ISBN 0-442-01642-5, 252 pp., £45.00, hb.
After the Ruins: restoring the countryside of Northern France after the Great War
Hugh Clout
Exeter, University of Exeter Press, 1996, ISBN 0-85989-491-6,332 pp., £35.
Environmental Aesthetics: ideas, politics and planning
J. Douglas Porteous
London and New York, Routledge, 1996, ISBN 0-415-13769-1, 20 pp., £15.99.
Countryside Survey 1990 Main Report
C.J. Barr, R.G.H. Bunce, R.T. Clarke, R.M. Fuller, M.T. Furse, M.K. Gillespie, G.B. Groom, C.J. Hallam, M. Hornung, D.C. Howard & M.J. Ness
London, Department of the Environment, 1993, 174 pp., £12.00 (available from DoE Publications Sales Unit, Block 3, Spur 2, Government Buildings, Lime Grove, Eastcote, HA4 8SE)
World of Environmental Design, Volume 1: Urban Spaces I (Streets and Squares)
Francisco Asenio Cerver
Barcelona, Arco Editorial, 1995, 255 pp., US$75 (per volume) ISBN 84-8185-004-7 (complete work), ISBN 84-8185-005-5 (Volume 1)
'The Remains of Distant Times': archaeology and the National Trust
David Morgan Evans, Peter Salway & David Thackray (Eds)
Woodbridge, Suffolk, The Boydell Press, 1996, ISBN 0-85115-671-1, hb, 235 pp., £29.50
Apostle of Taste: Andrew Jackson Downing 1815-1852
D. Schuyler
Baltimore, fohns Hopkins University Press, 1996, ISBN 0-8018-5229-3, $35.95 相似文献
37.
Karl Sauer Diemair E. Dinslage Kanitz Schwaibold Willy Lindner Haevecker Lehnartz E. Becker W. Schreiber Werner Hofmann Eduard Hofmann Steinbeck H. Süllmann Griebel Rudolf Abderhalden Lars Erlandsen Heyns O. v. Soden C. Steinhoff J. Großfeld Frey-Wyssling W. Sutthoff Bäurle Willy Lindner Ed. Rentz Bandow Gerards K. N. v. Kaulla O. v. Soden Maria Cicconi Pawletta Baars R. Grau Lerche Beckel O. Windhausen Felicitas Rolleri Jesser Karl Boresch R. W. Seuffert K. Müller Schloemer K. Höll Johannes Wolf Brüning Patzsch W. Ludorff 《European Food Research and Technology》1941,81(3):223-288
38.
v. Schröder Karl Boresch K. Dirr R. Ammon Diemair Griebel Schwaibold G. Mall Felicitas Rolleri Kanitz O. Windhausen K. Felix von Querner W. Ludorff E. Fischbach W. Sutthoff Frey-Wyssling Schormüller A. Pirson J. Großfeld E. Chytrek Koelitz Hans Hawelka W. Schreiber Brüning Estler Pawletta W. Wodsak Jesser H. J. Steinbeck Seuss Schmitz Lars Erlandsen W. Hämmerle Masch A. Bäurle W. Leithe Rudolj Abderhalden Haevecker Fr. Bartschat Garber G. Stamm Gertraude Körner-Hennig G. Steinhoff Johannes Wolf Rob Jungkunz Schönfeld Ed. Rentz Klinc K. Höll 《European Food Research and Technology》1940,79(6):568-608
39.
Bibliometric maps have the potential to become useful tools for science policy issues. The complexity of the structures, however,
makes it often very difficult to interpret the results. In this study, we present a case study in which we use the bibliometric
mapping results to address a high level science policy issue of research efficiency. By revealing the results in an alternative
way, we increased the utility of bibliometric mapping within the science policy context. Moreover, by including additional
information to the entities in the landscape, we provide useful input for the research potential. 相似文献
40.
Gump Brooks B.; Reihman Jacki; Stewart Paul; Lonky Ed; Granger Douglas A.; Matthews Karen A. 《Canadian Metallurgical Quarterly》2009,28(5):614
Objective: The authors recently reported that blood lead (Pb) was a significant mediator for the positive association between socioeconomic status (SES) and peripheral vascular responses to acute stress in children (B. B. Gump et al., 2007). The present study considers the possibility that Pb may also mediate an association between SES and cortisol responses to acute stress. Design: Early childhood Pb exposure was tested as a mediator for cross-sectional associations between SES and cortisol responses. Main Outcome Measures: The primary outcome was cortisol responses to acute stress in 9.5-year-old children (N = 108). Results: Lower family income was associated with significantly greater cortisol levels following an acute stress task. A mediational analysis confirmed that Pb was a significant mediator for this association. Conclusion: These results reaffirm the importance of considering the chemical environment as well as social and psychological environment when evaluating psychophysiological effects of low SES. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献