全文获取类型
收费全文 | 963篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 13篇 |
综合类 | 3篇 |
化学工业 | 256篇 |
金属工艺 | 29篇 |
机械仪表 | 15篇 |
建筑科学 | 32篇 |
能源动力 | 33篇 |
轻工业 | 72篇 |
水利工程 | 5篇 |
石油天然气 | 1篇 |
无线电 | 133篇 |
一般工业技术 | 182篇 |
冶金工业 | 34篇 |
原子能技术 | 16篇 |
自动化技术 | 142篇 |
出版年
2023年 | 6篇 |
2022年 | 10篇 |
2021年 | 11篇 |
2020年 | 8篇 |
2019年 | 15篇 |
2018年 | 10篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 27篇 |
2013年 | 55篇 |
2012年 | 47篇 |
2011年 | 52篇 |
2010年 | 50篇 |
2009年 | 53篇 |
2008年 | 50篇 |
2007年 | 43篇 |
2006年 | 45篇 |
2005年 | 43篇 |
2004年 | 25篇 |
2003年 | 31篇 |
2002年 | 34篇 |
2001年 | 12篇 |
2000年 | 12篇 |
1999年 | 23篇 |
1998年 | 20篇 |
1997年 | 16篇 |
1996年 | 18篇 |
1995年 | 20篇 |
1994年 | 17篇 |
1993年 | 7篇 |
1992年 | 15篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 9篇 |
1988年 | 11篇 |
1987年 | 12篇 |
1986年 | 7篇 |
1985年 | 10篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1982年 | 11篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 6篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1971年 | 5篇 |
排序方式: 共有966条查询结果,搜索用时 0 毫秒
91.
Abdelsalam Ahmed M. Elsheikh Ahmed Chidambaram Sivakumar David Jean-Pierre Langlois J. M. Pierre 《Journal of Signal Processing Systems》2020,92(1):95-107
Journal of Signal Processing Systems - Convolutional Neural Networks (CNNs) and Deep Neural Networks (DNNs) have gained significant popularity in several classification and regression applications.... 相似文献
92.
Influence of geometrical and operational parameters on the axial dispersion in an aerated channel reactor 总被引:1,自引:0,他引:1
Residence time distribution experiments have been performed on an activated sludge 3000 m3 channel reactor aerated by gas diffusion (for different liquid flowrates under constant aeration rate and constant water depth) and on a bench-scale channel reactor aerated from the bottom (for different liquid and gas flowrates and water depths) in order to characterize their hydrodynamics. Both units can be modeled as plug flow reactors with axial dispersion. A general correlation has been obtained to predict the axial dispersion coefficient as a function of the gas and liquid velocities and the geometrical parameters of the full-scale and bench-scale reactors. Finally, to facilitate the simulation of biological reactions in transient state, an equivalent model based on tanks-in-series with variable back-mixing flowrate is proposed. 相似文献
93.
This paper considers the present development of isdn in France. Two main components are used to already offer isdn services to big business users: rtc 64 and Telecom 1. Those two services, Transcom and Transdyn, have been defined to fullfill big business users needs and constitute the French first phase isdn. In a second part the article considers the evolution of this first phase isdn towards the progressive generalisation of isdn. Two points are then considered: inter-working between Telecom 1 satellite network and second phase isdn and development of reservation service. As a conclusion the paper describes some of the practical experiment gained in those already existing isdn services. 相似文献
94.
Simon Van Bael Tim Desmet Yoke Chin Chai Gregory Pyka Peter Dubruel Jean-Pierre Kruth Jan Schrooten 《Materials science & engineering. C, Materials for biological applications》2013,33(6):3404-3412
In the present study a structural characterization and in vitro cell-biological evaluation was performed on polycaprolactone (PCL) scaffolds that were produced by the additive manufacturing technique selective laser sintering (SLS), followed by a plasma-based surface modification technique, either non-thermal oxygen plasma or double protein coating, to functionalize the PCL scaffold surfaces. In the first part of this study pore morphology by means of 2D optical microscopy, surface chemistry by means of hydrophilicity measurement and X-ray photoelectron spectroscopy, strut surface roughness by means of 3D micro-computed tomography (CT) imaging and scaffold mechanical properties by means of compression testing were evaluated before and after the surface modifications. The results showed that both surface modifications increased the PCL scaffold hydrophilicity without altering the morphological and mechanical properties. In the second part of this study the in vitro cell proliferation and differentiation of human osteoprogenitor cells, over 14 days of culture in osteogenic and growth medium were investigated. The O2 plasma modification gave rise to a significant lower in vitro cell proliferation compared to the untreated and double protein coated scaffolds. Furthermore the double protein coating increased in vitro cell metabolic activity and cell differentiation compared to the untreated and O2 plasma PCL scaffolds when OM was used. 相似文献
95.
Maryse Demuynck Jean-Pierre Erauw Omer Van der Biest Francis Delannay Francis Cambier 《Journal of the European Ceramic Society》2012,32(9):1957-1964
In this study, the densification of alumina by spark plasma sintering (SPS) was investigated and compared to conventional hot pressing. It was shown that SPS is very effective in the sintering of alumina leading to higher densities and allows to work at lower temperatures and with shorter sintering cycles. The effect of the heating rate is dependent on the heating mode (SPS or HP). The identification of active sintering mechanisms was attempted by an isothermal and an anisothermal methods, showing that other mechanisms probably related to electrical effects enhance the densification. We suggest the higher contribution of surface diffusion mainly during the initial stage of sintering and an influence of the presence of impurities segregated at the grain boundaries. They could create conductive layers and also introduce ions with a lower valence than Al3+; defects are created in the surface layers and the diffusion of the species is increased. 相似文献
96.
Chrystelle Le Danvic Gaelle Guiraudie-Capraz Djamel Abderrahmani Jean-Pierre Zanetta Patricia Nagnan-Le Meillour 《Journal of chemical ecology》2009,35(7):741-751
Knowledge of endogenous ligands of olfactory binding proteins is a prerequisite for studying their role in odor and pheromone
transduction. Here, we report the extraction, derivatization, and characterization by gas chromatography-mass spectrometry
of the natural ligands of pig, Sus scrofa (L.), Von Ebner’s Gland protein (VEG) and odorant binding protein (OBP). We identified two isoforms (VEG1 and VEG2), which
differed only by the linkage of an O-N-acetylglucosamine (O-GlcNac) group on VEG1. The natural ligands of VEG1 were characterized as two isomers of testosterone, whereas ligands of
VEG2 and OBP were fatty acids or their derivatives. Our findings suggest that the binding specificity of VEG1 for steroids
is governed by the presence of an O-GlcNac moiety on the protein. This specificity was confirmed by the binding of radiolabeled testosterone only by VEG1 in
an in-gel binding assay. This is the first evidence for a post-translational modification in the process of odorant discrimination
by olfactory binding proteins. 相似文献
97.
98.
Thomas Unfer Jean-Pierre Boeuf François Rogier 《Computer Physics Communications》2010,181(2):247-1019
The breakdown of a gas gap at high products of pd (pressure × distance) is a multi-scale phenomenon in both time and space. This is especially true when the plasma is interacting with a gas flow, a problem of considerable recent interest in the context of aerodynamic applications of surface discharges. This paper presents a contribution to the numerical modeling of such discharges. We describe here a new approach for adaptive meshing which is suitable for use with the explicit asynchronous integration scheme described in our previous publication. Rather than relying on a family of nested grids as is commonly done, this technique is based on a single unstructured mesh with possible non-conforming cells at the interface between coarse and fine areas. Substantial computational time saving has been achieved for a surface dielectric barrier discharge configuration of the kind proposed as plasma actuators for flow control. 相似文献
99.
Khuram Shahzad Jan Deckers Jean-Pierre Kruth Jef Vleugels 《Journal of Materials Processing Technology》2013,213(9):1484-1494
Innovative powder preparation and post-processing techniques can be employed to obtain high density ceramic parts by means of indirect selective laser sintering. Thermally induced phase separation (TIPS) was used to produce polymer and polymer–ceramic composite particles. The effect of polymer concentration, cooling rate, stirring and alumina particles on polymer and polymer–ceramic composite particles was investigated. Homogeneous spherical alumina–polypropylene (PP) composite powder was synthesized by TIPS for selective laser sintering (SLS). Green Al2O3–PP component parts with a density of 34% could be produced by conventional SLS of the polymer under optimized laser power, scan speed, scan spacing and powder preheating temperature. Various post-processing techniques like pressure infiltration (PI), warm isostatic pressing (WIPing) or a combination of both were applied to increase the green density of the Al2O3–PP SLM parts. Infiltrating the open porosity green SLS parts with a 30 vol% alumina-powder based ethanol suspension allowed to increase the sintered density, i.e. after polymer debinding and pressureless sintering in air at 1600 °C, from 38 to 64% of the theoretical density (TD). WIPing of the SLS and SLS/infiltrated green parts at 135 °C and 64 MPa allowed raising the green density up to 93 and 83% TD and a sintered density up to 89 and 88% TD, respectively. 相似文献
100.