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structural Durability & Health Monitoring 2025年第1期19卷 25-54页

作者： Chao Zhang Shang-Xi Lai Hua-Ping Wang School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China key laboratory of special functional materials and structural design Ministry of EducationLanzhou UniversityLanzhou730000China

Modal parameters can accurately characterize the structural dynamic properties and assess the physical state of the ***,it is particularly signiﬁcant to identify the structural modal parameters according to the monitoring data information in the structural health monitoring(SHM)system,so as to provide a scientiﬁc basis for structural damage identiﬁcation and dynamic model modiﬁ*** view of this,this paper reviews methods for identifying structural modal parameters under environmental excitation and brieﬂy describes how to identify structural damages based on the derived modal *** paper primarily introduces data-driven modal parameter recognition methods(e.g.,time-domain,frequency-domain,and time-frequency-domain methods,etc.),brieﬂy describes damage identiﬁcation methods based on the variations of modal parameters(e.g.,natural frequency,modal shapes,and curvature modal shapes,etc.)and modal validation methods(e.g.,Stability Diagram and Modal Assurance Criterion,etc.).The current status of the application of artiﬁcial intelligence(AI)methods in the direction of modal parameter recognition and damage identiﬁcation is further *** on the pre-vious analysis,the main development trends of structural modal parameter recognition and damage identiﬁcation methods are given to provide scientiﬁc references for the optimized design and functional upgrading of SHM systems.

关键词： structural health monitoring data information modal parameters damage identiﬁcation AI method

Recent development in rare earth doped phosphors for white light emitting diodes

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Journal of Rare Earths 2015年第1期33卷 1-12页

作者：王育华朱革辛双宇王倩李艳艳吴泉生王闯王希成丁鑫耿婉莹 key laboratory for special function materials and structural design of the ministry of the education Lanzhou University Department of materials Science School of Physical Science and Technology Lanzhou University

As new light sources for next-generation illumination, white light-emitting diodes（WLEDs） have been extensively developed and are commercially available due to their excellent advantages, such as high efficiency, energy-saving, compactness, long operational lifetime and environmental friendliness. Currently, WLEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. In this review, the recent developments of phosphors for WLEDs were introduced combined with the relative work of our group. The common methods for generating white light for blue/ultraviolet（UV） WLEDs were summarized, including：（1） optimizing the commercially used phosphors;（2） developing some new phosphors based on UV LEDs chips;（3） realizing white light emission based on single host. Moreover, some typical new developed phosphors and their luminescence properties were introduced.

关键词： rare earths phosphors white LEDs development

Equivalent electromagnetic parameters for microwave metamaterial absorber using a new symmetry model

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Chinese Physics B 2019年第5期28卷 350-354页

作者： Junming Zhang Donglin He Guowu Wang Peng Wang Liang Qiao Tao Wang Fashen Li key laboratory for Magnetism and Magnetic materials (ministry of education) Lanzhou University key laboratory of special function materials and Structure design (ministry of education) Lanzhou University

Transmission line theory uses the complex nature of permeability and permittivity of a conventional magnetic absorber to evaluate its absorption properties and mechanism. However, because there is no method to obtain the electromagnetic parameters of a metamaterial-absorber integrated layer(composed of a medium layer and a periodic metal array), this theory is seldom used to study the absorption properties of the metamaterial absorber. We propose a symmetry model to achieve an equivalent complex permittivity and permeability model for the integrated layer, which can be combined with the transmission line theory to calculate metamaterial absorption properties. The calculation results derived from both the transmission line theory and the high-frequency structure simulator are in good agreement. This method will be beneficial in practical investigations of the absorption mechanism of a metamaterial absorber.

关键词： metamaterial absorber equivalent electromagnetic parameters transmission line theory

Edge-guided heart-shaped skyrmion

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Rare Metals 2022年第3期41卷 865-870页

作者： Chun-Lei Zhang Jia-Ning Wang Cheng-Kun Song Nasir Mehmood Zhao-Zhuo Zeng Yun-Xu Ma Jian-Bo Wang Qing-Fang Liu key laboratory for Magnetism and Magnetic materials of the ministry of education Lanzhou UniversityLanzhou 730000China key laboratory for special function materials and structural design of the ministry of the education Lanzhou UniversityLanzhou 730000China

Magnetic skyrmion, which is a kind of swirl-like topological protected spin structure, shows great potential in the racetrack memory. So far, this progress is in obstacle by the skyrmion Hall effect which means that t... 详细信息

关键词： shaped topological obstacle

Angle-dependent spin wave spectra of permalloy ring arrays

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Chinese Physics B 2022年第11期31卷 149-154页

作者： Shuxuan Wu Zengtai Zhu Yunxu Ma Jinwu Wei Senfu Zhang Jianbo Wang Qingfang Liu key laboratory for Magnetism and Magnetic materials of the ministry of education Lanzhou UniversityLanzhou 730000China Songshan Lake materials laboratory Dongguan 523808China key laboratory for special function materials and structural design of the ministry of the education Lanzhou UniversityLanzhou 730000China

We investigated the angle-dependent spin wave spectra of permalloy ring arrays with the fixed outer diameter and various inner diameters by ferromagnetic resonance spectroscopy and micromagnetic *** the field is obliquely applied to the ring,local resonance mode can be observed in different parts of the *** the resonance mode will change to perpendicular spin standing waves if the magnetic field is applied along the perpendicular *** simulation results demonstrated this evolution and implied more resonance modes that maybe *** the mathematical fitting results based on the Kittel equation further proved the existence of local resonance mode.

关键词： spin waves magnetic resonance spectra spintronic devices

Photoluminescence properties of color-tunable KLaSiO_4:Ce^(3+),Mn^(2+) phosphors

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Journal of Rare Earths 2015年第5期33卷 480-485页

作者：常文瑞王丹朋兴平王育华胡龄之王静 the key laboratory for special function materials and Structure design of the ministry of education School of Physical Science and TechnologyLanzhou University

A series of color-tunable KLaSiO4：Ce3＋,Mn2＋phosphors were successfully prepared and the luminescent properties were investigated. Upon excitation at 290 nm, the emission spectra of KLaSiO4：Ce3＋,Mn2＋phosphors included a blue emission band and a red emission band. Increasing the doping concentration of Mn2＋ions, the red emission was strengthened considerably, and the blue emission of Ce3＋ was reduced, owing to the efficient energy transfer. The composition optimized KLa0.96SiO4：0.02Ce3＋,0.02Mn2＋sample exhibited the white light emission brightly with the chromaticity coordinates of （0.331, 0.337）. Therefore, KLaSiO4：Ce3＋, Mn2＋could be used as a white phosphor candidate for white light-emitting diodes devices.

关键词： KLaSiO4:Ce3+,Mn2+ energy transfer color-tunable rare earths

An outlook of rare-earth activated persistent luminescence mechanisms

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Journal of Rare Earths 2016年第3期34卷 245-250页

作者：韩少春王育华曾巍陈文波 key laboratory for special function materials and Structure design of the ministry of education School of Physical Science and Technology Lanzhou University

By studying energy transfer and persistent energy transfer properties in Eu, Mn co-doped calcium aluminate CaAl_2O_4, it was found that traditional persistent luminescence mechanisms had difficulty in explaining persistent energy transfer property between Eu^（2＋） and Mn^（2＋） ions. Based on this question, a mechanism was suggested in which vibrational energy levels were considered as a Morse potential, and trap centers were distinguished into barriers and wells. Then, this phenomenon was explained by allowing energy transfer and persistent energy transfer could have different preference to different vibrational energy levels. Properties of trap centers were also discussed by using the concept of Madelung energy.

关键词： persistent luminescence rare earths phosphor aluminate

Continuous modulation of charge-spin conversion by electric field in Pt/CO_(2)Fe Si/Pb(Mg_(1/3)Nb_(2/3))O_(3)-Pb_(0.7)Ti_(0.3)O_(3 )heterostructures

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Chinese Physics B 2023年第5期32卷 580-585页

作者：赵逸冰方晓筱王志睿程淼谭永嘉韦东雄蒋长军幺金丽 key laboratory for Magnetism and Magnetic materials(ministry of education) Lanzhou UniversityLanzhou 730000China key laboratory of special function materials and Structure design(ministry of education) Lanzhou UniversityLanzhou 730000China

The half-metallic Heusler alloy CO_(2)FeSi is an ideal material in spintronic devices due to its higher spin polarization,higher Curie temperature and lower damping *** this work,the dynamic magnetism of CO_(2)FeSi is modulated by electric field and it is demonstrated that the charge-spin conversion efficiencyξis continuous and controllable by the electric *** further find an extremely highξin ferromagnetic/ferroelectric(FM/FE)heterostructures,which could be ascribed to interfacial effect in FM/FE ***,we investigate that the charge-spin conversion efficiency varies with the electric field in a butterfly-like behavior,which accords with the S–E curve of Pb(Mg_(1/3)Nb_(2/3))O_3-Pb_(0.7)Ti_(0.3)O_(3)(PMN-PT)and could be attributed to strain *** modulation of charge-spin conversion efficiency in FM/FE heterostructures via electric field presents a profound potential for next-generation spintronic devices and applications of current-induced magnetization switching.

关键词： Heusler alloy electric-field modulation strain effect Rashba effect

Influence of additives on the magnetic damping constant of CoIr soft magnetic thin films with negative magnetocrystalline anisotropy

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Chinese Physics B 2019年第5期28卷 312-317页

作者： Tianyong Ma Zhi Luo Zhiwei Li Liang Qiao Tao Wang Fashen Li key laboratory for Magnetism and Magnetic materials of the ministry of education Key Laboratory for Special Functional Materials and Structure Design of the Ministry of Education Lanzhou University

The oriented(CoIr)_(100-x)P_x(P = B, Ni, and SiO_2) soft magnetic films are prepared. Their morphology is measured using transmission electron microscopy(TEM), and reveals that these films exhibit good crystallinity and high degree of the c-axis orientation. The magnetic properties are thoroughly investigated as a function of doping x. Our results show that all of these films possess negative magnetocrystalline anisotropy as required by possible applications. Both the intrinsic and extrinsic contributions are considered to interpret the broadening of the ferromagnetic resonance spectral linewidth. The intrinsic Gilbert damping is identified as the main cause of the linewidth broadening, while the extrinsic part originating from inhomogeneities only plays a minor role. More interestingly, our results show that the damping constant can be controlled by using the doping method.

关键词： magnetic damping constant additives negative magnetocrystalline anisotropy

Theoretical study of the odd-even-order harmonic generation for asymmetric ions in non-Born-Oppenheimer approximation

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Chinese Physics B 2017年第7期26卷 161-166页

作者：岳生俊杜洪川吴红梅薛山赵家琛胡碧涛 School of Nuclear Science and Technology Lanzhou University key laboratory of special function materials and Structure design ministry of education Lanzhou University

We calculated the harmonic spectra generated from the asymmetric molecules of HD^＋ and HeH^2＋. It is found that HD＋produces only odd harmonics, while HeH^2＋produces both odd and even harmonics. Further analysis reveals that for both HD^＋ and HeH^2＋, the nuclear dipole acceleration can generate even harmonics, but it is three orders of magnitude lower than that of the electron. Hence, the electronic dipole acceleration dominates the harmonic generation. For HD^＋,the electronic dipole acceleration only contributes to the generation of odd harmonics, but for HeH^2＋it contributes to the generation of both odd and even harmonics. Besides, one concept of the broken degree of system-symmetry is proposed to explain the different odd-even property between the harmonic spectra of HD^＋ and HeH^2＋.

关键词： strong field physics odd-even-order harmonic dipole acceleration asymmetric ions