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404 results on '"Zhang, Yimei"'

1. Defining Computational Thinking as an Evident Tool in Problem-Solving: Comparative Research on Chinese and Canadian Mathematics Textbooks

Author

Zhang, Yimei and Savard, Annie

Abstract

Purpose: To analyze mathematics problem-solving (PS) procedures in Chinese (CH) and Canadian (CA) elementary mathematics textbooks that leverage computational thinking (CT) as a cognitive tool, which have evidently existed and been implemented. Design/Approach/Methods: In this study, an analysis framework was developed to investigate the characteristics of CT tools for three PS steps--understand the problem, devise and conduct plans, and look back into textbooks--in four contexts: data practices, modeling and simulation practices, computational tools practices, and systemic thinking practices. Findings: Our results demonstrate the tools (CT) employed in the PS process in CH and CA mathematics textbooks. The strong connections between the "look back" stage and CT tools were explored. During the "look back" stage, both countries required students to transfer their knowledge and perform generalization. In addition, CT is regarded as a basic skill analysis for students in mathematics education and has received significant attention at every stage of the PS process. Originality/Value: This study brings a new perspective to CT research in education by regarding CT as a cognitive tool for students in mathematics PS.

Published
2023

41. In situ reconstruction induced oxygen-deficient multiphase Cu based species hybridized with Ni single atoms as tandem platform for CO2 electroreduction.

Author

Liu, Juzhe, Wang, Yuheng, Mo, Pengpeng, Yang, Feng, Jiang, Kaiqi, Cheng, Zhixiang, Liu, Yuxuan, Sun, Zhiyi, Liu, Zheng, Zhang, Yimei, and Chen, Wenxing

Subjects
COPPER, ATOMS, COUPLING reactions (Chemistry), OXYGEN reduction, COMPOSITE materials, SPECIES
Abstract

Tandem catalysis, capable of decoupling individual steps, provides a feasible way to build a high-efficiency CO2 electroconversion system for multicarbons (C2+). The construction of electrocatalytic materials is one of focusing issues. Herein, we fabricated a single atom involved multivalent oxide-derived Cu composite material and found it inclined to reconstruct into oxygen-deficient multiphase Cu based species hybridized with monatomic Ni on N doped C matrix. In this prototype, rapid CO generation and C–C coupling are successively achieved on NiN4 sites and surface amorphized Cu species with defects, resembling a micro-production line. In this way, the in situ formed tandem catalyst exhibited a high Faradaic efficiency (FE) of ∼ 78% for C2+ products along with satisfactory durability over 50 h. Particularly, the reconstruction-induced amorphous layer with abundant asymmetric sites should be favorable to improve the ethanol selectivity (FE: 63%), which is about 10 times higher than that of the non-tandem Cu-based contrast material. This work offers a new approach for manipulating tandem catalyst systems towards enhancing C2+ products. [ABSTRACT FROM AUTHOR]

Published
2024
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