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708 results on '"Hu, Ziyang"'

1. Enhancing universal machine learning potentials with polarizable long-range interactions

Author

Gao, Rongzhi, Yam, ChiYung, Mao, Jianjun, Chen, Shuguang, Chen, GuanHua, and Hu, Ziyang

Subjects
Physics - Chemical Physics, Condensed Matter - Materials Science
Abstract

Long-range interactions are crucial in determining the behavior of chemical systems in various environments. Accurate predictions of physical and chemical phenomena at the atomic level hinge on accurate modeling of these interactions. Here, we present a framework that substantially enhances the predictive power of machine learning interatomic potentials by incorporating explicit polarizable long-range interactions with an equivariant graph neural network short-range potential. The pretrained universal model, applicable across the entire periodic table, can achieve first-principles accuracy. This versatile model has been further applied to diverse areas of research, including the study of mechanical properties, ionic diffusivity in solid-state electrolytes, ferroelectricity, and interfacial reactions, demonstrating its broad applicability and robustness., Comment: 13 pages, 5 figures

Published
2024

12. Research Progress on the Role of HMGB1 in Regulating the Function of Osteoarthritis Chondrocytes

Author

QI Xin, ZHANG Xiaogang, YU Haiyang, CHEN Xin, AN Wenbo, WANG Zhipeng, WANG Duoxian, LUO Pengfei, CHEN Yixin, MA Jiaojiao, QI Wei, HU Ziyang, and LIU Jianjun

Subjects
osteoarthritis, high mobility group box-1 protein, chondrocytes, signal pathway, Medicine
Abstract

Osteoarthritis (OA) is a chronic degenerative joint disease whose main characteristic is the destruction of articular cartilage, causing pain and disability in patients and seriously affecting their quality of life. OA can be induced by a variety of causes, and pathological changes in articular cartilage are considered to be one of the key driving factors for the occurrence of OA. High mobility group box-1 protein (HMGB1), as a non-histone protein in eukaryotic cells, can participate in regulating the inflammation and apoptosis process of OA chondrocytes, thus leading to the occurrence of OA. This article reviews the research on the mechanism of HMGB1 in OA chondrocytes, with a view to providing new ideas for the clinical prevention and treatment of OA.

Published
2024
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26. Impermeable Inorganic Walls Sandwiching Photoactive Layer toward Inverted Perovskite Solar and Indoor-Photovoltaic Devices

Author

Xu, Jie, Xi, Jun, Dong, Hua, Ahn, Namyoung, Zhu, Zonglong, Chen, Jinbo, Li, Peizhou, zhu, Xinyi, Dai, Jinfei, Hu, Ziyang, Jiao, Bo, Hou, Xun, Li, Jingrui, and Wu, Zhaoxin

Subjects
Condensed Matter - Materials Science, Physics - Optics
Abstract

Interfaces between the perovskite active layer and the charge-transport layers (CTLs) play a critical role in both efficiency and stability of halide-perovskite photovoltaics. One of the major concerns is that surface defects of perovskite could cause detrimental nonradiative recombination and material degradation. In this work, we addressed this challenging problem by inserting ultrathin alkali-fluoride (AF) films between the tri-cation lead-iodide perovskite layer and both CTLs. This bilateral inorganic walls strategy makes use of both physical-blocking and chemical-anchoring functionalities of the continuous, uniform and compact AF framework: on the one hand, the uniformly distributed alkali-iodine coordination at the perovskite-AF interfaces effectively suppresses the formation of iodine-vacancy defects at the surfaces and grain boundaries of the whole perovskite film, thus reducing the trap-assisted recombination at the perovskite-CTL interfaces and therewith the open-voltage loss; on the other hand, the impermeable AF buffer layers effectively prevent the bidirectional ion migration at the perovskite-CTLs interfaces even under harsh working conditions. As a result, a power-conversion efficiency (PCE) of 22.02% (certified efficiency 20.4%) with low open-voltage deficit (< 0.4V) was achieved for the low-temperature processed inverted planar perovskite solar cells. Exceptional operational stability (500 h, ISOS-L-2) and thermal stability (1000 h, ISOS-D-2) were obtained. Meanwhile, a 35.7% PCE was obtained under dim-light source (1000 lux white LED light) with the optimized device, which is among the best records in perovskite indoor photovoltaics.

Published
2020

44. Saturable absorption properties of mixed lead-tin halide perovskites and their application in near-infrared ultrafast lasers.

Author

Lan, Xinru, Yang, Cheng, Wei, Chengming, Liu, Jiabao, Zhang, Zeyu, Chen, Zhengwei, Wang, Xu, and Hu, Ziyang

Subjects
MODE-locked lasers, PEROVSKITE, OPTICAL modulation, SINGLE-mode optical fibers, HALIDES, FIBER lasers
Abstract

Mixed lead–tin halide perovskites, as highly sensitive materials in the near-infrared region, hold significant potential for optoelectronic device applications. Here, mixed lead–tin halide perovskite saturable absorbers (SAs) have been developed by coupling with the side-polished surfaces of the single-mode fibers and excellent saturable absorption effects of the mixed lead–tin halide perovskite SAs have been demonstrated in the near-infrared region. By constructing the in-gap site assisted carrier transfer mode, the saturation absorption process of the mixed lead–tin halide perovskite SAs can be well explained, in which defects as in-gap sites can help the photon-generated carriers transfer into the conduction band and promote the Pauli-blocking-induced absorption bleaching in the SA. Moreover, ytterbium-doped fiber lasers based on perovskite SAs have been fabricated, and mode-locked operations at 1040 nm are achieved using the mixed lead–tin halide perovskite SA, generating ultra-short pulses with a pulse width of 683 fs, 3 dB bandwidth of 4.88 nm, signal-to-noise ratio exceeding 49.74 dB, and a repetition rate of 3.74 MHz. Our findings demonstrate that the mixed lead–tin halide perovskite SAs have excellent optical modulation capability and promising applications in the field of ultrafast photonics. [ABSTRACT FROM AUTHOR]

Published
2024
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