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Xiaohua Zhao,Dunli Hu,Xinyu Yang,Xuewei Li,Xiaofan Feng,Jiaxia Yang 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.4
To further enhance the role of connected vehicles with the Human-Machine Interface (HMI) in helping drivers in foggy weather, it is meaningful to optimize the HMI based on the driver’s needs. In order to explore the method of HMI optimization, this paper builds a driving simulation experimental test platform of freeway connected vehicle system, designing two experimental scenarios according to the technical conditions (without HMI or with HMI). After that, the paper uses Markov chain to explore the drivers’ fixation transition to identify the driver’s needs in different sections at different conditions. Besides, combined with the visual trajectory results, the paper provides suggestions for optimizing HMI. The results show the review rate of drivers in each section for the straight upper front area is very high. The highest value occurs in the heavy fog zone, suggesting that HMI can provide more road information. HMI should offer a prompt to the driver before entering the warning zone, and remind the driver of changes in the speed limit before entering the fog area. The prompt module of HMI should shorten the horizontal length. In conclusion, this paper aims to propose a general diagnosis method by diagnosing the self-designed HMI.
Three-dimensionally Hierarchical Bi2WO6 Architectures with Enhanced Photocatalytic Activity
Tianhua Chen,Hongbing Lu,Jinniu Zhang,Jianzhi Gao,Feng Yin,Zhibo Yang,Qianru Liu,Xuewei Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.12
Three-dimensionally hierarchical Bi2WO6 architectures have been produced via a facile and economical hydrothermal method without any template or surfactant. This architecture with flower-like morphology is assembled by numbers of intercrossed nanosheets. Moreover, different Bi2WO6 nanostructures including multilayered disks and irregular nanoplates can also be produced by simply adjusting the pH value of the precursor solution. Importantly, this kind of hierarchically structured Bi2WO6 architecture exhibits a much better photocatalytic activity in the photodegradation of rhodamine B than that of conventional Bi2WO6 multilayered disks and nanoplates. This enhanced photocatalytic performance is mainly attributed to the large specific surface areas, special structural features and high capability of absorbed oxygen species. The present work offers an effective approach for the further improvement of photocatalytic activity by designing a desirable micro/nanoarchitecture.
Raman Spectral Band Oscillations in Large Graphene Bubbles
Huang, Yuan,Wang, Xiao,Zhang, Xu,Chen, Xianjue,Li, Baowen,Wang, Bin,Huang, Ming,Zhu, Chongyang,Zhang, Xuewei,Bacsa, Wolfgang S.,Ding, Feng,Ruoff, Rodney S. American Physical Society 2018 Physical Review Letters Vol.120 No.18
<P>Raman spectra of large graphene bubbles showed size-dependent oscillations in spectral intensity and frequency, which originate from optical standing waves formed in the vicinity of the graphene surface. At a high laser power, local heating can lead to oscillations in the Raman frequency and also create a temperature gradient in the bubble. Based on Raman data, the temperature distribution within the graphene bubble was calculated, and it is shown that the heating effect of the laser is reduced when moving from the center of a bubble to its edge. By studying graphene bubbles, both the thermal conductivity and chemical reactivity of graphene were assessed. When exposed to hydrogen plasma, areas with bubbles are found to be more reactive than flat graphene.</P>