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Event-related desynchronization (ERD) was studied in 10 young (mean age = 19.1) and 10 older (mean age = 62.8) subjects during a verbal recognition task. The attention load of the task varied according to the difficulty of discriminating between targets and distractors. EEG recorded from 29 electrodes was used to compute ERD from 14 source derivations in 125 ms intervals. Thereafter, it was displayed as spatiotemporal maps. The results show that attention influences the characteristics of EEG desynchronization. In young subjects, ERD is more pronounced and more widespread when the attentional load is high. In the elderly, differences between the two attention conditions are less marked. ANOVA reveals main effects of attention and time. The significant 'attention x time x age group' interaction confirms the presence of different brain activation patterns in the two age groups in relation to attention load. 相似文献
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Although molecule‐based materials can combine physical and chemical properties associated with molecular‐scale building blocks, their successful integration into real applications depends also on higher‐order properties, such as crystal size, shape, and organization. New approaches involving templating and self‐ or facilitated assembly of nanoscale building blocks to prepare novel multifunctional molecular magnetic materials with complex form and organization are described. 相似文献
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Khalid Quertite Hanna Enriquez Nicolas Trcera Yongfeng Tong Azzedine Bendounan Andrew J. Mayne Gérald Dujardin Pierre Lagarde Abdallah El kenz Abdelilah Benyoussef Yannick J. Dappe Abdelkader Kara Hamid Oughaddou 《Advanced functional materials》2021,31(7):2007013
Silicene, a new 2D material has attracted intense research because of the ubiquitous use of silicon in modern technology. However, producing free-standing silicene has proved to be a huge challenge. Until now, silicene could be synthesized only on metal surfaces where it naturally forms strong interactions with the metal substrate that modify its electronic properties. Here, the authors report the first experimental evidence of silicene nanoribbons on an insulating NaCl thin film. This work represents a major breakthrough, for the study of the intrinsic properties of silicene, and by extension to other 2D materials that have so far only been grown on metal surfaces. 相似文献
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Comtet G Dujardin G Hellner L Lastapis M Martin M Mayne AJ Riedel D 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2004,362(1819):1217-1226
The electronic or quantum control of individual molecules with the scanning tunnelling microscope offers exciting perspectives on operating molecular nanomachines. This implies the use of semiconductor surfaces rather than metallic surfaces which would rapidly quench the electronic excitations. We review recent results illustrating the state of the art and the main problems which need to be solved: the choice, design and properties of functionalized organic molecules on semiconductor surfaces; the control of the inelastic electronic channels through a single molecule; and the search for well-controlled atomic-scale wide-band-gap semiconductor surfaces. 相似文献
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D.-L. Nguyen S. Umbarkar M. K. Dongare C. Lancelot J.-S. Girardon C. Dujardin P. Granger 《Topics in Catalysis》2013,56(1-8):157-164
Supported gold catalysts on γ-Al2O3 have been investigated in the catalytic reduction of NO x in simulated Diesel exhaust gas conditions. Different parameters have been examined essentially the mode of gold incorporation via classical deposition–precipitation and anionic exchange methods and the nature of the pre-activation thermal treatment. The resistance to thermal ageing under reactive conditions at 500 °C was found completely different with a significant rate enhancement on anionic-exchange samples. Further comparisons also show that the nature of the pre-activation thermal treatment influences the extent of surface reconstructions during thermal ageing with a detrimental effect of reductive pre-treatment on the catalytic performances. 相似文献
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Y. H. Kahng R. B. Hallock E. Dujardin T. W. Ebbesen 《Journal of Low Temperature Physics》2002,126(1-2):223-228
We have measured the temperature-programmed desorption spectrum of
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He atoms from a sample of Single-Wall Carbon Nanotubes with various initial coverages. Several Analysis techniques have been applied to the data and the results are reported here. 相似文献