全文获取类型
收费全文 | 821篇 |
免费 | 62篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 3篇 |
综合类 | 1篇 |
化学工业 | 185篇 |
金属工艺 | 17篇 |
机械仪表 | 20篇 |
建筑科学 | 51篇 |
矿业工程 | 1篇 |
能源动力 | 34篇 |
轻工业 | 56篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 90篇 |
一般工业技术 | 161篇 |
冶金工业 | 81篇 |
原子能技术 | 4篇 |
自动化技术 | 176篇 |
出版年
2023年 | 7篇 |
2022年 | 7篇 |
2021年 | 27篇 |
2020年 | 20篇 |
2019年 | 21篇 |
2018年 | 22篇 |
2017年 | 33篇 |
2016年 | 52篇 |
2015年 | 27篇 |
2014年 | 40篇 |
2013年 | 61篇 |
2012年 | 54篇 |
2011年 | 62篇 |
2010年 | 48篇 |
2009年 | 48篇 |
2008年 | 43篇 |
2007年 | 37篇 |
2006年 | 25篇 |
2005年 | 22篇 |
2004年 | 20篇 |
2003年 | 25篇 |
2002年 | 14篇 |
2001年 | 7篇 |
2000年 | 6篇 |
1999年 | 8篇 |
1998年 | 23篇 |
1997年 | 19篇 |
1996年 | 16篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 10篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 10篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 5篇 |
1976年 | 1篇 |
1975年 | 4篇 |
1973年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有884条查询结果,搜索用时 156 毫秒
1.
El-Hokayem Antoine Falcone Yliès 《International Journal on Software Tools for Technology Transfer (STTT)》2022,24(2):159-181
International Journal on Software Tools for Technology Transfer - We use runtime verification (RV) to check various specifications in a smart apartment. The specifications can be broken down into... 相似文献
2.
3.
Philippe Colomban Marino Maggetti Antoine d’Albis 《Journal of the European Ceramic Society》2018,38(15):5228-5233
A Raman study of a Sèvres soft paste (frit) porcelain plate allowed the identification of both the crystalline and amorphous phases. Cristobalite and pseudowollastonite gave main Raman signatures in the body where also tridymite, amorphous alkali silicate glass and lead arsenate apatite were detected. Na0.4K0.1Ca0.5Pb4(AsO4)3 lacunar apatite is identified as opacifier in blue and green overglaze enamel. Pb-Sb-reach pyrochlore (Naples Yellow) pigment was found in yellow and green overglaze enamels. The orange hue is obtained by superposing a hematite bearing red paint stroke over the yellow. These results are compared to those previously obtained by detailed OM, SEM, XRD and XRF analyses. Some of the phases identified by XRD (quartz, tridymite) are hardly detected by Raman and vice versa cristobalite was not found by XRD, most probably due to its low amount. 相似文献
4.
5.
Antoine Depoorter Carmen Kalalian Corinne Emmelin Chantal Lorentz Christian George 《Indoor air》2021,31(3):682-692
People spend approximately 80% of their time indoor, making the understanding of the indoor chemistry an important task for safety. The high surface-area-to-volume ratio characteristic of indoor environments leads the semi-volatile organic compounds (sVOCs) to deposit on the surfaces. Using a long path absorption photometer (LOPAP), this work investigates the formation of nitrous acid (HONO) through the photochemistry of adsorbed nitrate anions and its enhancement by the presence of furfural. Using a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS), this work also investigates the surface emissions of VOCs from irradiated films of furfural and a mix of furfural and nitrate anions. Among the emitted VOCs, 2(5H)-furanone/2-Butenedial was observed at high concentrations, leading to maleic anhydride formation after UV irradiation. Moreover, the addition of potassium nitrate to the film formed NOx and HONO concentrations up to 10 ppb, which scales to ca. 4 ppb for realistic indoor conditions. This work helps to understand the high levels of HONO and NOx measured indoors. 相似文献
6.
Theodoros A. Papadopoulos Hong Li Eung-Gun Kim Jie Liu James A. Cella Christian M. Heller Andrew Shu Antoine Kahn Anil Duggal Jean-Luc Brédas 《Israel journal of chemistry》2014,54(5-6):779-788
At metal/organic interfaces, the insertion of an organic monolayer can significantly modify the surface properties of the substrate, especially in terms of charge injection across the interface. Herein, we study the formation of an insulating monolayer of morpholine or amine-functionalized polystyrene on Al(111) and Au(111) surfaces and its impact on surface work-function and charge injection. First-principles calculations based on Density Functional Theory have been carried out and point to a significant decrease in the work-function of modified metal surfaces; this is in very good agreement with ultraviolet photoemission spectroscopy measurements performed on the Au(111) surface. In addition, a bilayer cathode, consisting of a thin film of high-work-function metal, such as Al and Au, and a layer of amine-functionalized polystyrene, was also fabricated and tested in organic light-emitting diodes. Such bilayer structures exhibit substantially enhanced efficiency when compared with controls without the functionalized polymers. Our combined theoretical and experimental investigation gives insight into how a thin layer of a commodity polymer can be used to transform rather high-work-function metals into high-performance cathodes to provide efficient electron injection. 相似文献
7.
Elisabeth Lichtenberger A. Subbakrishniah Milton H. Grannatt rd Antoine S. Bailly Charles G. Schmidt Dougald A. MacFarlane Rudolf Andorka Ernesto Quintanilla L. B. Wallerstein Stan Openshaw Herman G. Berkman Kingsley E. Haynes W. W. Hall Jr. Richard B. Le Heron John E. Stapleford Alan Pearman Paul Soyke Thomas R. Beard Howard F. Newell Michael Dear Kenneth D. Lawrence Peter Mastenbroek Rolf B. Schmitt Sung Woong Hong A. A. Horner James M. Murray Donald W. Jones W. E. Mullendore 《The Annals of Regional Science》1977,11(3):129-183
8.
Antoine S. Bailly William J. Coffey Lay J. Gibson 《The Annals of Regional Science》1996,30(2):153-163
After initiating a provocative discussion on “regional science in crisis” (Bailly and Coffey 1994; Gibson 1994; Plane 1994; Stough 1994; Anas 1994; Vickerman 1994; Casetti 1995), we now wish to present some additional thoughts on how regional scientists can simultaneously make their field more relevant scientifically and more useful for society. At a time when resources are tight, when the number of regional science students is small, when administrators are scrutinizing our budgets and our ability to generate outside money, we need to do something to regain (or is it simply to gain?) our place in the sun. In this paper, we argue that regional scientists will not reestablish their field by using classical approaches to regional analysis alone. It is essential that we look at new ways to answer questions raised by our social, economic, and political institutions. More specifically, we make some observations concerning the history of regional science, its role within universities, and its nature, as well as offering some suggestions concerning how regional scientists can attempt to improve the situation. 相似文献
9.
Characterization of activated sludge flocs by confocal laser scanning microscopy and image analysis 总被引:7,自引:0,他引:7
Schmid M Thill A Purkhold U Walcher M Bottero JY Ginestet P Nielsen PH Wuertz S Wagner M 《Water research》2003,37(9):2043-2052
In this study we present a new approach to determine volumes, heterogeneity factors, and compositions of the bacterial population of activated sludge flocs by 3D confocal imaging. After staining the fresh flocs with fluorescein-isothiocyanate, 75 stacks of images (containing approx. 3000 flocs) were acquired with a confocal laser scanning microscope. The self-developed macro 3D volume and surface determination for the KS 400 software package combined the images of one stack to a 3D image and calculated the real floc volume and surface. We determined heterogeneity factors like the ratio of real floc surface to the surface of a sphere with the respective volume and the fractal dimension (D(f)). According to their significant influence on floc integrity and quality, we also investigated the chemical composition of flocs and quantified their bacterial population structure by using group-specific rRNA-targeted probes for fluorescence in situ hybridization. By a settling experiment we enriched flocs with poor settling properties and determined the above-mentioned parameters. This approach revealed shifts in floc volume, heterogeneity, and bacterial and chemical composition according to the settling quality of the flocs. 相似文献
10.
Removal of the endocrine disrupter nonylphenol and its estrogenic activity in sludge treatment processes 总被引:2,自引:0,他引:2
The estrogenic compound nonylphenol (NP) is frequently found in sludge from sewage treatment works. Hence, when sewage sludge is spread on the land, endocrine-disrupting compounds may get into the soil. The goal of this study was to investigate the extent to which aerobic mesophilic treatment in continuous reactors permits the removal of NP from sludge and how this process may be useful for treating anaerobically stabilised sludge. We also report on the behaviour of NP during the anaerobic treatment of sludge. The reduction in sludge estrogenic activity observed in the different types of treatment, as measured using estrogen-responsive reporter cells lines (MELN bioassay), was compared with NP removal rates. Under anaerobic conditions, no degradation of NP and its estrogenic activity was observed. Indeed, an accumulation of the compound occurred. In contrast, high removal of NP was achieved in aerobic conditions as well as in aerobic Post-treatment of anaerobically pre-digested sludge, with a concomitant reduction of the sludge's estrogenic potency. 相似文献