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419 results on '"Li, Changcheng"'

60. Restoring cellular calcium homeostasis to rescue ER stress by 1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid acetoxymethyl ester-loaded lipid-mPLGA hybrid-nanoparticles for acute kidney injury therapy

Author

Zhang, Jingwen, primary, Yan, Jiahui, additional, Wang, Yanan, additional, Liu, Hong, additional, Sun, Xueping, additional, Gu, Yuchao, additional, Yu, Liangmin, additional, Li, Changcheng, additional, Wu, Jun, additional, and He, Zhiyu, additional

Published
2023
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61. Unveiling the strong coulomb interaction effect on electronic structures and mechanical properties of C4AF.

Author

Shuai, Junhao, Wan, Jieshuo, Zhi, Xiao, Ye, Jiayuan, Li, Changcheng, Maulida, Pramitha Yuniar Diah, Arramel, Arramel, Chen, Wei, Wang, Fazhou, and Li, Neng

Subjects
POLAR effects (Chemistry), CRYSTAL structure, ELECTRONIC structure, FERRITES
Abstract

There are works have reported the crystal structures and mechanical properties of ferrite cement (C4AF) at the atomic scale with deviation owing to the omission of the Coulomb interaction effect (Ueff) between 3d electrons of Fe in C4AF. In this work, the DFT+U method was used to evaluate its effect on their electronic structures and mechanical properties of C4AF with two different phases I2mb (C4AF‐I) and Pnma (C4AF‐P). The FeO bonds of the two phases are all weaker and display Ueff due to the presence of Fe ions. The mechanical properties of C4AF calculated using DFT+U method significantly differ from those obtained without considering Ueff, in which the former shows lower inferior mechanical properties than the latter. This work presents a comparative study the effect of Coulomb interaction to the internal electronic structures and mechanical properties, which will pave the way for designing high hydration reaction cement and high toughness materials. [ABSTRACT FROM AUTHOR]

Published
2023
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76. Regularized Linear Programming Discriminant Rule with Folded Concave Penalty for Ultrahigh-Dimensional Data.

Author

Li, Changcheng, Li, Runze, Wen, Jiawei, Yang, Songshan, and Zhan, Xiang

Subjects
*LINEAR programming, *ALGORITHMS, *COMPUTER simulation
Abstract

We propose the regularized linear programming discriminant (LPD) rule with folded concave penalty in the ultrahigh-dimensional regime. We use the local linear approximation (LLA) algorithm to redirect the model with folded concave penalty to a weighted ℓ1 model. The strong oracle property of the solution constructed by the one-step local linear approximation (LLA) algorithm is verified. In addition, we propose efficient and parallelizable algorithms based on feature space split to address the computational challenges due to ultrahigh dimensionality. The proposed feature-split algorithm is compared to existing methods by both numerical simulations and applications to real data examples. The numerical comparisons suggest that the proposed method works well for ultrahigh dimensions, while the linear programming solver and alternating direction method of multiplier (ADMM) algorithm may fail for such high dimensions. for this article are available online. [ABSTRACT FROM AUTHOR]

Published
2023
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