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Your search keyword '"Yu, Jiaqi"' showing total 490 results
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490 results on '"Yu, Jiaqi"'

1. Pixel-scale NIR-VIS Spectral Routers Based on 2D Mie-type Metagratings

Author

Shao, Yifan, Guo, Shuhan, Chen, Rui, Dang, Yongdi, Zhou, Yi, Wang, Yubo, Zhan, Junjie, Yu, Jiaqi, Ju, Bing-Feng, and Ma, Yungui

Subjects
Physics - Optics
Abstract

The out-of-band energy loss caused by in-built color filters significantly degrades the signal-to-noise ratio and the dynamic range of conventional image sensors, which has restricted the attempt to develop ultrahigh-density imaging devices by merely shrinking the pixel size. This issue will be more serious for security cameras which need to collect visible (VIS) light and near-infrared (NIR) photons as well. The existing solutions mostly explore complex photonic nanostructures, which are often too complicated for production. In this work, we demonstrate a pixel-scale spectral router utilizing two-dimensional (2D) Si3N4 Mie scattering metagratings that can spatially divide NIR (850 nm) and VIS (400-700 nm) light to different pixels at high efficiencies. It has a minimum feature size larger than 360 nm, highly promising for massive production. Compared with the traditional filter design, our router can gain about 42% and 30% signal enhancement for NIR and VIS band, respectively. We show that it also has good polarization insensitivity and incident angle tolerance. The NIR-VIS simultaneous imaging is inspected without any complex reconstruction algorithm. Mode analysis indicates that the multipolar scattering of our Mie-type metagratings provides the necessary degrees of freedom to spatially optimize the routing functions for broadband photons.

Published
2024
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8. Developing a Stealth Assessment System Using a Continuous Conjunctive Model

Author

Yu, Jiaqi, Ma, Wenchao, Moon, Jewoong, and Denham, Andre R.

Abstract

Integrating learning analytics in digital game-based learning has gained popularity in recent decades. The interactive nature of educational games creates an ideal environment for learning analytics data collection. However, past research has limited success in producing accessible and effective assessments using game learning analytics. In this study, a mathematics educational game called The Nomads was designed and developed to train learners' adaptive expertise in rational number arithmetic. Players' game log data were captured and fitted to a cognitive diagnostic model (CDM)--CCM (continuous conjunctive model). CCM lends itself well to the complex and dynamic nature of game learning analytics. Unlike traditional CDMs, CCM generates parameters at an attribute level and offers more parsimonious diagnoses using continuous variables. The findings suggest that learners' attribute mastery improved during the gameplay and that learners benefit from using the scaffolds for three of the attributes instructed by the game. This study presents the application of a powerful new tool for game learning analytics. Future studies can benefit from more generalized analytics models and more specified learning attributes and game tasks.

Published
2022

10. We Do What We Are: Representation of the Self-Concept and Identity-Based Choice.

Author

Chen, Stephanie Y, Urminsky, Oleg, and Yu, Jiaqi

Subjects
REASONING, IDENTITY (Psychology), SELF-perception, GROUP identity, CONSUMER preferences, CONSUMER behavior, CONSUMER behavior research, CAUSATION (Philosophy)
Abstract

The current research proposes a novel approach to identity-based choice that focuses on consumers' representations of the self-concept, as captured by the perceived cause–effect relationships among features of an individual consumer's self-concept. More specifically, the studies reported here test the proposal that the causal centrality of an identity—the number of other features of a consumer's self-concept that the consumer believes influenced or were influenced by the identity—underlies identity importance and is a determinant of identity-based consumer behaviors. Across seven studies, using both measured and manipulated causal centrality, the current research provides evidence for the role of causal centrality in identity-based choice. Among consumers who share an identity (belong to the same social category), those who believe that the identity is more causally central perceive the identity as more important and are more likely to engage in behaviors consistent with the norms of the social category. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Preparation and Crosslinking Capacity of Dialdoxylose

Author

JING Shutong, LI Zhengsheng’ao, LI Han, CAO Honghua, LI Xuecong, LIU Yonghao, YU Jiaqi, WEN Jingru, SUN Xun

Subjects
crosslinking, chitosan, gel, dialdoxylose, Food processing and manufacture, TP368-456
Abstract

Objective: To design and synthesize dialdoxylose, a glutaraldehyde analogue which is expected to have a low toxicity, and to characterize its performance in crosslinking chitosan in 1% acetic acid solution. Methods: Dialdoxylose was obtained by sodium periodate oxidation and deprotection of monoacetone glucose and used to form crosslinked chitosan gels. The gel strength, fluid properties, water activity and thermal stability of chitosan gels were analyzed by texture profile analysis (TPA), low field-nuclear magnetic resonance (NMR) spectroscopy and differential scanning calorimetry (DSC). Results: It was found that dialdoxylose exhibited two structures in water, (α,β) and (β,β), with a ratio of 44.4:65.6. The hardness, viscosity and water-holding capacity of the chitosan gel crosslinked with 0.002 g/mL dialdoxylose were highest. Conclusion: Dialdoxylose has an obvious crosslinking effect on chitosan, which is greatly affected by its concentration. The results of this study are of theoretical guiding significance for the development of new low-toxicity small-molecule crosslinking agents.

Published
2023
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