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594 results on '"Li, Yanghui"'

1. All-voltage control of Giant Magnetoresistance

Author

Wei, Lujun, Zhang, Yiyang, Huang, Fei, Yang, Jiajv, Peng, Jincheng, Li, Yanghui, Lu, Yu, Chen, Jiarui, Liu, Tianyu, Pu, Yong, and Du, Jun

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The aim of voltage control of magnetism is to reduce the power consumption of spintronic devices. For a spin valve, the magnetization directions of two ferromagnetic layers determine the giant magnetoresistance magnitude. However, achieving all-voltage manipulation of the magnetization directions between parallel and antiparallel states is a significant challenge. Here, we demonstrate that by utilizing two exchange-biased Co/IrMn bilayers with opposite pinning directions and with ferromagnetic coupling through the Ruderman-Kittel-Kasuya-Yosida interaction between two Co layers, the magnetization directions of the two ferromagnetic layers of a spin valve can be switched between parallel and antiparallel states through allvoltage-induced strain control. The all-voltage controlled giant magnetoresistance is repeatable and nonvolatile. The rotation of magnetizations in the two Co layers under voltages, from antiparallel to parallel states, occurs in opposite directions as revealed through simulations utilizing the Landau-Lifshitz-Gilbert equation. This work can provide valuable reference for the development of low-power all-voltage-controlled spintronic devices.

Published
2024

3. Study on Braking Temperature and Stress Fields of Metro Wheel Tread Considering Wheel-Axle Interference Fit

Author

SUN Xiaojuan, LI Yanghui, JIANG Lianyun, CHAI Ke, and NI Chao

Subjects
metro wheel, thermal-mechanical coupling, interference fit, worn wheel, temperature field, stress field, Chemical engineering, TP155-156, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

Purposes The stress on the metro wheel is complicated, which is not only influenced by the wheel-rail coupling force and the contact pressure induced by the axle-wheel interference fit, but also by the thermal load generated during braking. Methods In this paper, a metro wheel with single S-type spoke plate is taken as the research object. The finite element model of the wheel is established in ABAQUS software and the influence of the axle-wheel interference fit is analyzed on the mechanical stress distribution of the wheel under the straight-line load condition. The thermal-mechanical coupling model of the wheel is established at tread braking under the turnout load condition. The direct coupling method is used to study the variation of the temperature and stress fields of the wheel. Effects of mechanical stress and thermal-mechanical coupling stress on the structural strength of the wheel under different wear levels are studied. Findings Results show that the thermal load mainly affects the structure near the tread, while the part near the hub is greatly affected by the interference fit. The maximum difference of coupling stress between the new wheel and the worn-to-limit wheel is up to 69.3 MPa. The coupling stress of the wheel is relatively stable within the diameter range of 820-840 mm, with a float of only 9.1 MPa. Conclusion This study provides scientific reference for the structural design of metro wheels and can give a good guidance for the maintenance work.

Published
2024
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20. Deep-Learned Broadband Encoding Stochastic Filters for Computational Spectroscopic Instruments

Author

Song, Hongya, Ma, Yaoguang, Han, Yubing, Shen, Weidong, Zhang, Wenyi, Li, Yanghui, Liu, Xu, Peng, Yifan, and Hao, Xiang

Subjects
Physics - Instrumentation and Detectors
Abstract

Computational spectroscopic instruments with Broadband Encoding Stochastic (BEST) filters allow the reconstruction of the spectrum at high precision with only a few filters. However, conventional design manners of BEST filters are often heuristic and may fail to fully explore the encoding potential of BEST filters. The Parameter Constrained Spectral Encoder and Decoder (PCSED) - a neural network-based framework is presented for the design of BEST filters in spectroscopic instruments. By incorporating the target spectral response definition and the optical design procedures comprehensively, PCSED links the mathematical optimum and practical limits confined by available fabrication techniques. Benefiting from this, the BEST-filter-based spectral camera present a higher reconstruction accuracy with up to 30 times' enhancement and a better tolerance on fabrication errors. The generalizability of PCSED is validated in designing metasurface- and interference-thin-film-based BEST filters.

Published
2020

49. The Image of the Stove in <italic>A Doll House</italic>.

Author

Li, Yanghui and Wang, Quan

Subjects
*DOLLHOUSES, *HOME furnishings, *FOREIGN language education, *DANCE techniques, *CHRISTMAS trees
Abstract

The article explores the significance of the stove as a recurring image in Henrik Ibsen's play, A Doll House. The stove serves as a source of physical warmth and psychological energy for the characters, symbolizing their transformation throughout the play. It represents comfort, security, and familial unity, but also reveals the characters' vulnerabilities and power dynamics. The article argues that the stove propels the development of the play, witnessing Nora's growth and Helmer's downfall, and ultimately transforming the characters' doll-like identities. [Extracted from the article]

Published
2024
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