全文获取类型
收费全文 | 4752篇 |
免费 | 253篇 |
国内免费 | 32篇 |
专业分类
电工技术 | 87篇 |
综合类 | 222篇 |
化学工业 | 1186篇 |
金属工艺 | 334篇 |
机械仪表 | 104篇 |
建筑科学 | 274篇 |
矿业工程 | 20篇 |
能源动力 | 108篇 |
轻工业 | 279篇 |
水利工程 | 28篇 |
石油天然气 | 40篇 |
武器工业 | 7篇 |
无线电 | 396篇 |
一般工业技术 | 858篇 |
冶金工业 | 253篇 |
原子能技术 | 30篇 |
自动化技术 | 811篇 |
出版年
2023年 | 60篇 |
2022年 | 93篇 |
2021年 | 146篇 |
2020年 | 118篇 |
2019年 | 126篇 |
2018年 | 121篇 |
2017年 | 133篇 |
2016年 | 174篇 |
2015年 | 126篇 |
2014年 | 201篇 |
2013年 | 261篇 |
2012年 | 248篇 |
2011年 | 328篇 |
2010年 | 233篇 |
2009年 | 194篇 |
2008年 | 231篇 |
2007年 | 202篇 |
2006年 | 176篇 |
2005年 | 141篇 |
2004年 | 123篇 |
2003年 | 82篇 |
2002年 | 82篇 |
2001年 | 52篇 |
2000年 | 95篇 |
1999年 | 77篇 |
1998年 | 111篇 |
1997年 | 55篇 |
1996年 | 57篇 |
1995年 | 53篇 |
1994年 | 63篇 |
1993年 | 100篇 |
1992年 | 73篇 |
1991年 | 37篇 |
1990年 | 26篇 |
1989年 | 29篇 |
1988年 | 34篇 |
1987年 | 23篇 |
1986年 | 36篇 |
1985年 | 26篇 |
1984年 | 16篇 |
1979年 | 15篇 |
1976年 | 14篇 |
1966年 | 16篇 |
1965年 | 38篇 |
1964年 | 38篇 |
1963年 | 39篇 |
1962年 | 55篇 |
1961年 | 58篇 |
1960年 | 58篇 |
1959年 | 29篇 |
排序方式: 共有5037条查询结果,搜索用时 15 毫秒
51.
52.
Streamflow alteration and habitat ramifications for a threatened fish species in the Central United States
下载免费PDF全文
![点击此处可从《河流研究与利用》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In the Central United States, the Arkansas darter (Etheostoma cragini) is listed as a threatened fish species by the State of Kansas. Survival of the darter is threatened by loss of habitat caused by changing streamflow conditions, in particular flow depletion. Future management of darter populations and habitats requires an understanding of streamflow conditions and how those conditions may have changed over time in response to natural and anthropogenic factors. In Kansas, streamflow alteration was assessed at 9 U.S. Geological Survey streamgages in 6 priority basins with no pronounced long‐term trends in precipitation. The assessment was based on a comparison of observed (O) and predicted expected (E) reference conditions for 29 flow metrics. The O/E results indicated a likely or possible diminished flow condition in 2 basins; the primary cause of which is groundwater‐level declines resulting from groundwater pumping for irrigated agriculture. In these 2 basins, habitat characteristics adversely affected by flow depletion may include stream connectivity, pools, and water temperature. The other 4 basins were minimally affected, or unaffected, by flow depletion and therefore may provide the best opportunity for preservation of darter habitat. Through the O/E analysis, anthropogenic streamflow alteration was quantified and the results will enable better‐informed decisions pertaining to the future management of darters in Kansas. 相似文献
53.
Lars Fritzsche Jürgen Wegge Martin Schmauder Matthias Kliegel Klaus-Helmut Schmidt 《Ergonomics》2014,57(2):148-161
Prior research suggests that ergonomics work design and mixed teams (in age and gender) may compensate declines in certain abilities of ageing employees. This study investigates simultaneous effects of both team level factors on absenteeism and performance (error rates) over one year in a sample of 56 car assembly teams (N = 623). Results show that age was related to prolonged absenteeism and more mistakes in work planning, but not to overall performance. In comparison, high-physical workload was strongly associated with longer absenteeism and increased error rates. Furthermore, controlling for physical workload, age diversity was related to shorter absenteeism, and the presence of females in the team was associated with shorter absenteeism and better performance. In summary, this study suggests that both ergonomics work design and mixed team composition may compensate age-related productivity risks in manufacturing by maintaining the work ability of older employees and improving job quality. 相似文献
54.
55.
Joseph Eng Jr. Bernd Frühberger Jingguang G. Chen Brian E. Bent 《Catalysis Letters》1998,54(3):133-140
The thermal decomposition pathways of isobutene and 1-butene on both Mo(110) and 4 × 4-C/Mo(110) surfaces have been studied using high-resolution electron energy loss spectroscopy (HREELS) in order to highlight the substantially different activities of these two surfaces towards the cleavage of C–H and C–C bonds. On clean Mo(110), the CH2 group of isobutene decomposes upon heating to 150 K, producing either a /-bonded isobutenylidene [(CH3)2CCH] species or a 1,1-di-/-bonded isobutenyl [(CH3)2CC] species. Upon further heating, extensive C–H bond scission occurs to form hydrocarbon fragments which do not contain CH3 or CH2 groups, but appear to have largely intact carbon skeletons. By contrast, isobutene is molecularly adsorbed on the carbide-modified surface at 150 K. Further heating produces isobutylidyne [(CH3)2HCC] by 300 K, which subsequently decomposes via C–C bond scission to generate surface methyl groups. The different activation sequence of the C–H and C–C bonds of isobutene on clean and carbide-modified Mo(110) surfaces is also qualitatively confirmed by comparative studies of 1-butene on the two surfaces. 相似文献
56.
57.
Claudia Kuenzer Patrick Leinenkugel Matthias Vollmuth Stefan Dech 《International journal of remote sensing》2014,35(8):2752-2779
In this article we present the results of a comparison of six globally available land-cover products for the Mekong Basin – an area that spans 795,000 km2 and comprises parts of six riparian countries: China, Myanmar, Thailand, Laos, Cambodia, and Vietnam. The basin covers most climatic zones: from high-altitude, snow-covered mountainous regions in the north, to subtropical and tropical rainforest areas and agricultural land further south. The geopolitically important region not only is home to over 72,000,000 inhabitants, but also is a centre of attention of several environmental modelling experts, trying to assess future hydrologic dynamics, climate variability, as well probable land-use developments in the area.We compare land-cover products of the University of Maryland, UMD 1992–1993, the GLC 2000 product, the GlobCover products of 2004–2006 and 2009, as well as the MODIS-derived land-cover products of 2001 and 2009. For harmonization of individual legends, the Land Cover Classification System, LCCS, has been employed. However, even after harmonization, cross-tabulation among the products reveals extreme differences, where the impact of differing classification algorithms weighs higher than the impact of temporal coincidence of products. Especially, differences within mixed-vegetation classes are large, strongly impacting the overall assessment of forested land, other vegetated land, and even cultivated land in the Mekong Basin. The findings presented here are of high relevance for the modelling community as well as Mekong-related environmental studies, which should consider global remote-sensing-derived products with caution and solid background knowledge. 相似文献
58.
Jens Cornelis Markus Ihmsen Andreas Peer Matthias Teschner 《Computer Graphics Forum》2014,33(2):255-262
We propose to use Implicit Incompressible Smoothed Particle Hydrodynamics (IISPH) for pressure projection and boundary handling in Fluid‐Implicit‐Particle (FLIP) solvers for the simulation of incompressible fluids. This novel combination addresses two issues of existing SPH and FLIP solvers, namely mass preservation in FLIP and efficiency and memory consumption in SPH. First, the SPH component enables the simulation of incompressible fluids with perfect mass preservation. Second, the FLIP component efficiently enriches the SPH component with detail that is comparable to a standard SPH simulation with the same number of particles, while improving the performance by a factor of 7 and significantly reducing the memory consumption. We demonstrate that the proposed IISPH‐FLIP solver can simulate incompressible fluids with a quantifiable, imperceptible density deviation below 0.1%. We show large‐scale scenarios with up to 160 million particles that have been processed on a single desktop PC using only 15GB of memory. One‐ and two‐way coupled solids are illustrated. 相似文献
59.
60.
The presented study describes the processes and mechanisms of batch fluidized bed drying. The influencing factors of hot air drying are theoretically and experimentally examined, in order to present the relations between temperature and humidity profiles and all other drying parameters. A physical model is presented to facilitate the calculation of the drying processes under defined conditions. Three succeeding drying stages are therefore modeled. Mass and energy balances including all components taking part in the process are formulated. The model clarities the drying process under the assumption of pure heat transfer mechanisms. It does not contain adaptive parameters and takes into account an inactive bypass fraction of the fluidization and drying medium. The evaluation of the model was successful for two fluidized bed plants with nominal widths of 100 mm and 400 mm. The experiments showed sufficient accuracy and transferability of the model to equipment of application‐oriented dimensions. 相似文献