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273 results on '"Xie, Shiwei"'

4. A Case Study of Prevalence and Causes of Eye Tracking Data Loss in a Middle School Classroom

Author

Xue, Xiaorui, Xie, Shiwei, Mishra, Shitanshu, Wright, Anna M., Biswas, Gautam, and Levin, Daniel T.

Abstract

Recent advances in eye-tracking technology afford the possibility to collect rich data on attentional focus in a wide variety of settings outside the lab. However, apart from anecdotal reports, it is not clear how to maximize the validity of these data and prevent data loss from tracking failures. Particularly helpful in developing these techniques would be to describe the prevalence and causes of tracking failures in authentic environments. To meet this goal, we analyzed video records aligned with eye-tracking data collected from screen-mounted eye trackers employed in a middle-school classroom. Our sample includes records from 35 students recorded during multiple eye-tracking sessions. We compared student head position, body posture, attentiveness, and social interactions for time periods associated with successful and unsuccessful eye tracking. Overall, we observed substantial data loss and found that student inattentiveness, movements toward the eye tracker, and head rotations were the most prevalent factors inducing data loss. In addition, we observed a substantial relationship between data loss and apparent low involvement in the learning task. These data suggest that eye-tracking data loss is an important problem and that it can present a threat to validity because it can bias datasets to overrepresent high involvement behaviors. Based on these findings, we present several recommendations for increasing the proportion of usable data and to counter possible biases that data loss may introduce.

Published
2022
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43. Design and preparation of low-temperature curable, tough, repairable epoxy containing hindered urea-based dynamic reversible bonds.

Author

Qi, Shuai, Xie, Shiwei, Li, Bo, Liu, Chang, Gong, Sai, Zhang, Xiao, and Li, Shenzhen

Abstract

Traditional epoxy resins are of technological significance for structural adhesives and composite materials, as well as many others. However, brittleness limits its further development, and achieving a combination of toughness and rigidity in epoxy networks remains a great challenge. In this work, we designed and synthesized low-temperature curable, tough and repairable epoxy networks via hindered urea bond (HUB) crosslinking strategies. Mechanical testing revealed that the material exhibited simultaneously improved toughness and stiffness, and specifically, tensile strength, elongation at break, and toughness were able to reach 78.2 MPa, 8.61%, and 4.63 MJ · m−3, respectively. More importantly, the dynamic exchange of HUB dispersed between polymer chains enables HUB crosslinked epoxy with thermal-triggered reparability and recyclability. In addition, thermal properties, chemical stability and water resistance of toughened epoxy samples were also characterized. This work provides a practical guidance for the exploration of high-performance epoxy with the potential to be extended to other polymers. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Efficient H 2 O 2 Production and Activation by Air Diffusion Cathode Combined with Ultraviolet for Lake Water Treatment: A Long-Term Evaluation.

Author

Hong, Hui, Xie, Shiwei, Qiu, Aoxue, Yao, Yuming, Jiang, Wenzhe, Li, Jilei, Wan, Zihao, Xiang, Shengjie, Xi, Chenyi, Xiao, Jingxian, and Zhang, Na

Subjects
ULTRAVIOLET water treatment, BODIES of water, CATHODES, WATER pollution, ULTRAVIOLET lamps
Abstract

This study utilizes a natural air diffusion cathode (ADC) and an ultraviolet lamp to construct a UV/H2O2 reactor for the in situ synthesis and activation of H2O2 and evaluates its potential application in practical lake water treatment. The results indicate that the reactor exhibits stable treatment performance during a continuous flow experiment of 80 h. The air diffusion cathode maintains an H2O2 concentration of above 350 mg·L−1 in sodium sulfate electrolyte and shows no decreasing trend. Under the condition of approximately 59% H2O2 utilization, the removal rates of COD and TOC are 37.6% and 40.0%, respectively; the rate of reduction of A254 is 64.3%; while the total bacterial count removal rate reaches 100%. Large organic molecules in surface water are degraded to small organic molecules and mineralized to inorganic minor molecules. It effectively ameliorates the problem of organic pollution of surface water and effectively kills bacteria and improves the microbiological safety of the water body. Therefore, the UV/H2O2 system developed in this study, based on electrochemically produced H2O2, is an effective method for treating micro-polluted surface water. [ABSTRACT FROM AUTHOR]

Published
2024
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