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排序方式: 共有478条查询结果,搜索用时 15 毫秒
11.
James A. Anderson Fiona-Mairead McKenna Angel Linares-Solano Richard P. K. Wells 《Catalysis Letters》2007,119(1-2):16-20
By conducting the catalytic hydrogenation over water miscible Pd/carbon nanofibre catalysts, selective ring hydrogenation
of aromatic acids can be performed in aqueous solution without the need to provide protection for the external acid function. 相似文献
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Drivers' choice of speed is an important aspect of everyday risk-taking behavior because it has been shown to be one of the most important predictors of road accident involvement. This research developed, validated, and applied a measure of drivers' speed choice that combined a high degree of experimental control with external and ecological validity. In Study 1, a video-simulation measure of drivers' speed choice was developed and found to relate specifically to speed-related accident involvement among, implying a degree of external validity. In Study 2, the measure was used to investigate the effect of auditory feedback on drivers' speed choice. It was found that increasing the level of internal car noise decreased drivers' preferred speeds. Further analyses indicated that this was likely due to perceptual effects on speed estimation. Results are discussed in terms of road safety and the ability of video-based measures to facilitate experimental control over tasks involving complex ecological stimuli. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
13.
Wu E.Y. McKenna J.M. Lai W. Nowak E. Vayshenker A. 《Electron Device Letters, IEEE》2001,22(12):603-605
We report the effect of change of voltage acceleration on temperature dependence of oxide breakdown for ultra-thin oxides below 6 nm. The time- or charge-to-breakdown (TBD/QBD) is directly measured over a wide range of temperatures (-30°C to 200°C) for several fixed voltages using different area capacitors and long-term stress. Using extensive experimental evidence, we unequivocally demonstrate that this strong temperature dependence of oxide breakdown on ultra-thin oxides is not a thickness effect as previously suggested at least for thickness range investigated in this work. It is a consequence of two experimental facts: 1) voltage-dependent voltage acceleration and 2) temperature-independent voltage acceleration within a fixed TBD window. These results provide a coherent picture for TBD in both voltage and temperature domains for ultra-thin oxides 相似文献
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Eric P. A. Talbot Melodie Richardson Jeffrey M. McKenna F. Dean Toste 《Advanced Synthesis \u0026amp; Catalysis》2014,356(4):687-691
A mild, catalytic, atom economical synthesis of imidazo[1,2‐a]pyridines has been developed: catalytic dichloro(2‐pyridinecarboxylato)gold [PicAuCl2] in the presence of an acid produces a range of imidazo[1,2‐a]pyridines in good yields starting from alkynes and 2‐aminopyridine N‐oxides. This strategy is mild and foreseen to be of particular use for the installation of stereogenic centers adjacent to the imidazo[1,2‐a]pyridine ring without loss of enantiomeric excess.
16.
Timothy J. Roberts Stephen J. McKenna Ian W. Ricketts 《Image and vision computing》2006,24(12):1332-1342
A likelihood formulation for detailed human tracking in real-world scenes is presented. In this formulation, the appearance, modelled using feature distributions defined over regions on the surface of an articulated 3D model, is estimated and propagated as part of the state. The benefit of such a formulation over currently used techniques is that it provides a dense, highly discriminatory object-based cue that applies in real world scenes. Multi-dimensional histograms are used to represent the feature distributions and an on-line clustering algorithm, driven by prior knowledge of clothing structure, is derived that enhances appearance estimation and computational efficiency. An investigation of the likelihood model shows its profile to be smooth and broad while region grouping is shown to improve localisation and discrimination. These properties of the likelihood model ease pose estimation by allowing coarse, hierarchical sampling and local optimisation. 相似文献
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Groshek Frank; Kerfoot Erin; McKenna Vanessa; Polackwich Alan S.; Gallagher Michela; Holland Peter C. 《Canadian Metallurgical Quarterly》2005,119(1):202
In Pavlovian appetitive conditioning, rats often acquire 2 classes of conditioned responses: those whose form is determined by the reinforcer, and those whose form is determined by characteristics of the conditioned stimulus (CS). Consistent with the results of previous lesion studies, reversible inactivation of amygdala central nucleus function during pairings of an auditory CS with food prevented the acquisition of conditioned orienting responses specific to auditory CSs, whereas food-related conditioned behaviors were acquired normally. Neither inactivation nor posttraining neurotoxic lesions of the central nucleus affected the expression of previously acquired conditioned orienting. Thus, although the central nucleus is critical to the acquisition of information required for conditioned orienting to auditory cues, it is not needed for maintaining this information for later use. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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