全文获取类型
收费全文 | 827篇 |
免费 | 47篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 1篇 |
综合类 | 1篇 |
化学工业 | 339篇 |
金属工艺 | 32篇 |
机械仪表 | 19篇 |
建筑科学 | 23篇 |
矿业工程 | 6篇 |
能源动力 | 34篇 |
轻工业 | 54篇 |
无线电 | 46篇 |
一般工业技术 | 131篇 |
冶金工业 | 22篇 |
原子能技术 | 1篇 |
自动化技术 | 167篇 |
出版年
2024年 | 5篇 |
2023年 | 13篇 |
2022年 | 92篇 |
2021年 | 113篇 |
2020年 | 26篇 |
2019年 | 23篇 |
2018年 | 45篇 |
2017年 | 38篇 |
2016年 | 46篇 |
2015年 | 26篇 |
2014年 | 52篇 |
2013年 | 57篇 |
2012年 | 52篇 |
2011年 | 56篇 |
2010年 | 45篇 |
2009年 | 31篇 |
2008年 | 25篇 |
2007年 | 18篇 |
2006年 | 23篇 |
2005年 | 21篇 |
2004年 | 19篇 |
2003年 | 12篇 |
2002年 | 4篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1995年 | 3篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有876条查询结果,搜索用时 15 毫秒
91.
S. Gourdin L. Marcin M. Podgorski M. Cherif L. Carroz 《Journal of Materials Science》2017,52(24):13736-13747
Effective elastic properties and residual stresses were assessed in directionally solidified ternary eutectic ceramic, Al2O3/YAG/ZrO2, by finite element analyses. A 3D finite element model was generated from a CT scan, representative of the microstructure and with a similar volume fraction. Effective elastic properties were calculated by numerical homogenisation. They highlight a quasi-isotropic behaviour of the ternary eutectic ceramics. Despite the difficulties to measure the strain, the dispersion observed in the results and the limited reliability of the materials properties, the results constitute a step towards a better understanding of the material behaviour. Thermal residual stresses induced by the manufacturing were also evaluated. Tensile residual stresses in yttria-stabilised zirconia and compressive residual stresses in YAG and alumina were highlighted. This evaluation also shed light on the influence of the phase morphology in the microstructure. Indeed, the computed spatial distribution of the residual stresses showed that they are different from one position to another due to the variation in phase morphology and also to material properties variability. Therefore, it is important when numerically assessing the thermomechanical properties to take into account the microstructure morphology as well as the variability of material properties. 相似文献
92.
Pazera Marcin Buciakowski Mariusz Witczak Marcin Mrugalski Marcin 《Neural computing & applications》2020,32(2):379-389
Neural Computing and Applications - The paper is devoted to the problem of a neural network-based robust simultaneous actuator and sensor faults estimator design for the purpose of the fault... 相似文献
93.
Aishwarya Srivastava Siddhant Aggarwal Amy Apon Edward Duffy Ken Kennedy Andre Luckow Brandon Posey Marcin Ziolkowski 《Software》2020,50(6):868-898
We investigate the challenges of building an end-to-end cloud pipeline for real-time intelligent visual inspection system for use in automotive manufacturing. Current methods of visual detection in automotive assembly are highly labor intensive, and thus prone to errors. An automated process is sought that can operate within the real-time constraints of the assembly line and can reduce errors. Components of the cloud pipeline include capture of a large set of high-definition images from a camera setup at the assembly location, transfer and storage of the images as needed, execution of object detection, and notification to a human operator when a fault is detected. The end-to-end execution must complete within a fixed time frame before the next car arrives in the assembly line. In this article, we report the design, development, and experimental evaluation of the tradeoffs of performance, accuracy, and scalability for a cloud system. 相似文献
94.
Marcin Idczak Dominique Groleau Patrice Mestayer Jean-Michel Rosant Jean-François Sini 《Building and Environment》2010
This paper presents a validation of the thermo-radiative model SOLENE and its application for analysing the street canyon energy balance. The validation data were selected from the temperature and radiation measurements obtained during the JAPEX campaign, previously described by Idczak et al. [16]: a set of four lines of steel containers buildings composing three parallel street canyons at an approximate 1:5 scale. Reference weather data and micrometeorological conditions within the canyon were measured. Numerical simulations were carried out using the meteorological measurements as model inputs. The simulated surface temperatures and radiation fluxes are compared with the measurements for a full week period, with a focus on a day with clear sky conditions. The street canyon energy balance analysis demonstrates that the most energetic surface was the street ground due to its thick surface layer of tar-coated gravels while the walls had a low heat capacity. The thermal radiation balance was negative for all canyon surfaces. The sensible heat was transferred mainly from the canyon surfaces to the ambient air, but also from the air to the ground in the morning. The effective albedo of the canyon had a diurnal value of 0.20–0.25, but dropped to 0.10 in the afternoon when the ground strongly transformed the direct and reflected solar radiation into sensible heat. This narrow street configuration enhanced solar radiation absorption and longwave radiation trapping. 相似文献
95.
96.
Krzysztof Dmitruk Marcin Denkowski Michał Mazur Paweł Mikołajczak 《Signal, Image and Video Processing》2017,11(4):613-620
Dual-energy X-ray imaging has a vast range of application in security. Luggage inspection is an essential process for an airplane or court house security as well as securing mass events. An image of a content of some package may help to figure out if there is any dangerous object inside and avoid possibly threatening situation. As the raw X-ray images are not always easy to analyze and interpret, some image processing methods like an object detection, a frequency resolution increase or a pseudocoloring are being used. Since color can be a powerful tool to improve the usefulness of an information display, we propose pseudocoloring improvement by modifying material-based approach with edge detection to fill and sharpen color layers over the image making it easier to read and analyze. We demonstrate the effectiveness of the methods using real data, acquired from a professional dual-energy X-ray scanner. 相似文献
97.
Woźnica E Wójcik MM Wojciechowski M Mieczkowski J Bulska E Maksymiuk K Michalska A 《Analytical chemistry》2012,84(10):4437-4442
For the first time, application of a membrane composed of gold nanoparticles decorated with complexing ligand for potentiometric sensing is shown. Gold nanoparticles drop cast from a solution form a porous structure on a substrate electrode surface. Sample cations can penetrate the gold nanoparticles layer and interact with ligand acting as a charged ionophore, resulting in Nernstian potentiometric responses. Anchoring of complexing ligand on the gold surface abolishes the necessity of ionophore application. Moreover, it opens the possibility of preparation of potentiometric sensors using chelators of significantly different selectivity patterns further enhanced by the absence of polymeric membrane matrix. This was clearly seen, for example, for gold nanoparticles stabilizing the applied ligand-dithizone-thiol conformation leading to a high potentiometric selectivity toward copper ions, much higher than that of ionophores typically used to induce selectivity for polymeric ion-selective membranes. 相似文献
98.
99.
Rajiv Kumar Marcin Nyk Tymish Y. Ohulchanskyy Christopher A. Flask Paras N. Prasad 《Advanced functional materials》2009,19(6):853-859
Here, novel nanoprobes for combined optical and magnetic resonance (MR) bioimaging are reported. Fluoride (NaYF4) nanocrystals (20–30 nm size) co‐doped with the rare earth ions Gd3+ and Er3+/Yb3+/Eu3+ are synthesized and dispersed in water. An efficient up‐ and downconverted photoluminescence from the rare‐earth ions (Er3+ and Yb3+ or Eu3+) doped into fluoride nanomatrix allows optical imaging modality for the nanoprobes. Upconversion nanophosphors (UCNPs) show nearly quadratic dependence of the photoluminescence intensity on the excitation light power, confirming a two‐photon induced process and allowing two‐photon imaging with UCNPs with low power continuous wave laser diodes due to the sequential nature of the two‐photon process. Furthermore, both UCNPs and downconversion nanophosphors (DCNPs) are modified with biorecognition biomolecules such as anti‐claudin‐4 and anti‐mesothelin, and show in vitro targeted delivery to cancer cells using confocal microscopy. The possibility of using nanoprobes for optical imaging in vivo is also demonstrated. It is also shown that Gd3+ co‐doped within the nanophosphors imparts strong T1 (Spin‐lattice relaxation time) and T2 (spin‐spin relaxation time) for high contrast MR imaging. Thus, nanoprobes based on fluoride nanophosphors doped with rare earth ions are shown to provide the dual modality of optical and magnetic resonance imaging. 相似文献
100.
Marcin Pisarek Maria Janik-Czachor Tomasz Płociński Mariusz Łukaszewski 《Journal of Materials Science》2009,44(21):5701-5712
Rapidly quenched amorphous alloys—containing metallic or metalloid elements—are precursors for selective catalysts of many
technically important reactions. To increase their activity, various methods of material degradation occurring at the surface
and in the bulk of the rapidly quenched alloys have been used for promoting the catalytic performance of such materials. The
modifications of the structure, composition, and morphology of the substrate proved to be efficient in transforming inactive
metal alloy precursors into active and selective catalysts for hydrogenation, and dehydrogenation of organic compounds, as
well as for other processes like steam reforming of methanol. This article presents several examples of characterization of
such catalysts and discusses their selectivity and activity in a connection with physical and chemical properties of their
surfaces. Moreover, it is shown that scanning electron microscopy, Auger electron spectroscopy, scanning Auger microscopy,
and energy dispersive spectrometry allowed the local changes occurring during the activation process to be identified and
their implications for catalytic function to be considered. 相似文献