全文获取类型
收费全文 | 1401篇 |
免费 | 56篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 14篇 |
综合类 | 1篇 |
化学工业 | 373篇 |
金属工艺 | 51篇 |
机械仪表 | 29篇 |
建筑科学 | 64篇 |
矿业工程 | 1篇 |
能源动力 | 52篇 |
轻工业 | 170篇 |
水利工程 | 5篇 |
无线电 | 146篇 |
一般工业技术 | 283篇 |
冶金工业 | 56篇 |
原子能技术 | 12篇 |
自动化技术 | 202篇 |
出版年
2023年 | 8篇 |
2022年 | 23篇 |
2021年 | 52篇 |
2020年 | 25篇 |
2019年 | 26篇 |
2018年 | 26篇 |
2017年 | 22篇 |
2016年 | 32篇 |
2015年 | 27篇 |
2014年 | 52篇 |
2013年 | 109篇 |
2012年 | 81篇 |
2011年 | 133篇 |
2010年 | 98篇 |
2009年 | 83篇 |
2008年 | 83篇 |
2007年 | 63篇 |
2006年 | 66篇 |
2005年 | 49篇 |
2004年 | 38篇 |
2003年 | 41篇 |
2002年 | 37篇 |
2001年 | 20篇 |
2000年 | 20篇 |
1999年 | 22篇 |
1998年 | 14篇 |
1997年 | 31篇 |
1996年 | 15篇 |
1995年 | 22篇 |
1994年 | 15篇 |
1993年 | 12篇 |
1992年 | 9篇 |
1991年 | 13篇 |
1990年 | 4篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1987年 | 12篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有1459条查询结果,搜索用时 31 毫秒
71.
Multimerization behaviour of single chain Fv variants for the tumour-binding antibody B72.3 总被引:2,自引:0,他引:2
Desplancq Dominique; King David J.; Lawson Alastair D.G.; Mountain Andrew 《Protein engineering, design & selection : PEDS》1994,7(8):1027-1033
A systematic study has been performed on the relationship betweenlinker length, relative orientation of variable domains, multimerizationbehaviour and antigen binding activity for single chain Fvs(scFvs) of the tumour-binding antibody B72.3. Thirteen scFvvariants with linkers comprising up to six repeats of the motifGly-Gly-Gry-Gly-Ser were studied. All these scFvs showed a tendencyto form dimers or higher molecular weight species, and thistendency decreased with increasing linker length. The dimersand higher molecular weight forms may arise from head to tailintermolecular association of VH and VL domains. For each linkerlength, scFvs with the organization VL-linker-VH showed greaterbinding activity than those with the organization VH-linker-VL.In fact, for the latter organization only the variant with a30 amino acid linker showed good binding activity, suggestingthat (0 for B72.3 the C-tenninus of VH or the N-tenninus ofVL makes a structural contribution to antigen binding, and (ii)shorter linkers interfere with this contribution. Antigen bindingstudies on scFvs should be interpreted with caution becauseof their tendency to multlmerize. Such multimerization can beminimized by using linkers longer than those in common use 相似文献
72.
Véronique Gauthier Benoît Cochepin Sylvain Dubois Dominique Vrel 《Journal of the American Ceramic Society》2006,89(9):2899-2907
Ti3 SiC2 is synthesized by self-propagating high-temperature synthesis (SHS) of elemental titanium, silicon, and graphite powders. The reaction paths and structure evolution are studied in situ during the SHS of the 3Ti+Si+2C mixture by time-resolved X-ray diffraction coupled with infrared thermography. The proposed reaction mechanism suggests that Ti3 SiC2 might be formed from Ti–Si liquid phase and solid TiC x . Finally, the effect of the powders starting composition on the Ti3 SiC2 synthesis is studied. For the investigated initial mixtures, TiC x is always formed as a major impurity together with the Ti3 SiC2 phase. 相似文献
73.
Farhad Gharagheizi Ali Eslamimanesh Amir H. Mohammadi Dominique Richon 《Chemical engineering science》2012,68(1):290-304
Determination of diffusion coefficients of pure compounds in air is of great interest for modeling of air pollution control processes. In this communication, a Group Contribution (GC) method is applied to represent/predict the molecular diffusivity of chemical compounds in air at 298.15 K and atmospheric pressure. 4661 compounds from various chemical families have been investigated to propose a comprehensive and predictive model. The final model is resulted from coupling the Artificial Neural Network (ANN) with group contributions. Using this dedicated model, we obtain satisfactory results quantified by the following statistical results: Squared Correlation Coefficient=0.995, Standard Deviation Error=0.02, and Average Absolute Deviation=1.4% for the calculated/predicted properties from existing experimental values. 相似文献
74.
Staffan Jacobsson Anna Bergek Dominique Finon Volkmar Lauber Catherine Mitchell David Toke Aviel Verbruggen 《Energy Policy》2009
The recent EU Commission proposal for promoting the supply of power from renewable energy sources was originally based on a pan-European, harmonised tradable green certificate (TGC) scheme. We suggest, on the basis of a multi-disciplinary analysis, that a pan-EU TGC system is not the way forward for Europe. It is vital that the Commission (and the majority of Member States) avoids implementation of such policy designs put forward by a coalition of vested interests. They should instead look at, and act upon, the available evidence from those countries that have experimented with TGCs (e.g. Flanders, UK and Sweden) and design policies that stand a better chance of meeting the criteria of effectiveness, efficiency and equity. In particular, the policies must enable EU to meet the immense innovation/industrialisation challenge by inducing the development of a capital goods industry that can, eventually, diffuse a broad range of technologies that use renewable energy sources. Only then we can acquire an ability to implement an industrial revolution in the energy system in a way that broadly meets the criteria of effectiveness and dynamic efficiency. 相似文献
75.
Saïd Aferka Pierre Marchot Michel Crine Dominique Toye 《Chemical engineering science》2010,65(1):511-516
In this paper, we report on the use of X-ray tomography to visualize and quantify the gas–liquid interfacial area in modular catalytic distillation packing elements.The calculation method is based on processing of tomographic images. It is validated by comparing specific surface area determined on dry packings (Mellapak? 752Y and Katapak? SP12) tomographic binary images (gas and solid) to values announced by manufacturers, based on geometrical considerations. These data agree fairly well. However, tomographic images show that the specific area is not distributed uniformly over the height of a packing element due to the presence of perforations in corrugated sheets and of wall wipers between the packing and the column wall. X-ray tomography is a unique technique to access to the spatial distribution of these geometrical details in a non-intrusive way.The method used to determine the specific surface area of dry packing is then applied to irrigated packing in order to determine the gas–liquid interfacial area. The axial distribution of the interfacial area is non-uniform and is correlated to the packing specific area. The maxima of the specific surface area correspond to the presence of wall wipers.The gas–liquid interfacial area averaged over the column length is determined. It increases logically with the liquid superficial velocity and slightly with the gas velocity. The effect of the gas velocity is however more pronounced when reaching loading point. 相似文献
76.
Giovanni Crupi Dominique M. M.‐P. Schreurs Alina Caddemi Antonio Raffo Giorgio Vannini 《国际射频与微波计算机辅助工程杂志》2010,20(1):87-93
The present article analyzes in detail different intrinsic small‐signal models for transistors. Particular attention is devoted to the non‐quasi‐static effects, which play a crucial role at microwave and millimeter‐wave frequencies. The advantages and disadvantages of these different equivalent circuit topologies are analyzed from both theoretical and experimental standpoints. This study clearly proves that best choice among these model representations depends on the specific device technology besides the investigated frequency range. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. 相似文献
77.
Honorine Angue Mintsa Gilles Roy Cong Tam Nguyen Dominique Doucet 《International Journal of Thermal Sciences》2009,48(2):363-371
This paper presents effective thermal conductivity measurements of alumina/water and copper oxide/water nanofluids. The effects of particle volume fraction, temperature and particle size were investigated. Readings at ambient temperature as well as over a relatively large temperature range were made for various particle volume fractions up to 9%. Results clearly show the predicted overall effect of an increase in the effective thermal conductivity with an increase in particle volume fraction and with a decrease in particle size. Furthermore, the relative increase in thermal conductivity was found to be more important at higher temperatures. Obtained results compare favorably with certain data sets and theoretical models found in current literature. 相似文献
78.
Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates 总被引:1,自引:0,他引:1
Dominique Bouchard Sébastien Leboeuf Jean-Paul Nadeau Roderick I. L. Guthrie Mihaiela Isac 《Journal of Materials Science》2009,44(8):1923-1933
Dynamic wetting and heat transfer during the start of solidification were studied with the help of molten aluminum droplets
falling from a crucible onto a copper substrate. A high-speed camera captured the change in the spreading droplet’s geometry,
while thermocouple, inserted inside the substrate, allowed a heat transfer analysis to be performed. Droplet spreading factors
and interfacial heat fluxes were then used to, respectively, characterize dynamic wetting and heat transfer for the various
experimental conditions explored. These were: (1) effects of chemical composition of the aluminum alloy, (2) initial temperature
of the substrate, (3) surface roughness of the substrate, and (4) composition of the gaseous atmosphere. The experiments were
all carried out in gaseous atmospheres containing oxygen in sufficient amount to form oxide skins at the surface of the droplets
and the substrates. The results showed instances where an improvement in the dynamic wetting was accompanied by an increase
in heat transfer during the early stages of solidification but this was not systematic. In these cases where a positive correlation
was not observed, it was postulated this was caused by factors such as variations in the oxidation at the surface of the substrates
and the droplets as well as gas trapped at the interface between the droplets and the substrates.
Sébastien Leboeuf formerly with the Aluminum Technology Centre and McGill University. 相似文献
79.
Laurent Mezeix Christophe Bouvet Julitte Huez Dominique Poquillon 《Journal of Materials Science》2009,44(14):3652-3661
Entangled fibrous materials have been manufactured from different fibers: metallic fibers, glass fibers, and carbon fibers.
Specimens have been produced with and without cross-links between fibers. Cross-links have been achieved using epoxy spraying.
The scope of this article is to analyze the mechanical behavior of these materials and to compare it with available models.
The first part of this article deals with entangled fibrous materials without cross-link between fibers. Compression tests
are detailed and test reproducibility is checked. In the second part, compression tests were performed on materials manufactured
with cross-linked fibers. The specific mechanical behavior obtained is discussed. 相似文献
80.