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2023 Advanced Fiber Laser Conference, AFL 2023

作者： Li, Nan Zhang, Jiaxu Luo, Yifan Guo, Jinjia Zheng, Ronger Zheng, Yongqiu Zhang, Chengfei State Key Laboratory of Dynamic Measurement Technology North University of China Taiyuan030051 China College of Information Science and Engineering Ocean University of China Qingdao266100 China Inner Mongolia Aerospace Power Machinery Testing Institute Hohhot010076 China

ISBN: (纸本)9781510677661

With the advantages of fast, real-Time, multi-element detection and little or no sample pretreatment, laser-induced breakdown spectroscopy (LIBS) technology has a broad range of applications in seafloor hydrothermal chimneys and mineral resource exploration. However, most of the analyses are still mainly dependent on laboratory tests after sampling. Underwater LIBS suffers from low detection sensitivity and poor stability due to the attenuation of laser energy by the water and confinement and quenching effects of the plasma. For long-Time underwater solids LIBS analysis, particles, debris, etc. generated by pulsed laser ablation of solid samples further degrade the underwater LIBS signal intensity and stability. Aiming at this issue, we proposed a new method for underwater solids LIBS analysis assisted by circulating sink. The effect of the circulating sink on the LIBS emission intensity and signal stability for underwater solid targets was investigated by using spectroscopy and imaging techniques with an Al target immersed in deionized water. It is shown that the emission intensity of the Al I lines is increased by 21.5% and the signal stability, i.e., relative standard deviation (RSD), is decreased by 38.8% after utilizing the circulating sink compared to the ordinary sink. The plasma image results show that the plasma obtained by utilizing the circulating sink is more compact in size, more intense in emission, and more stable. The results demonstrate that the use of the circulating sink can effectively improve the quality and stability of LIBS signals for underwater solid targets, which provides a new means of long-Time laboratory LIBS analysis of underwater solid targets, and will also play an important role in the accurate quantitative analysis of underwater LIBS. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Spectrum analysis

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Simulation on Electromagnetic Shielding Effectiveness of Multi-layer Cylindrical Metal Enclosures 16th

Simulation on Electromagnetic Shielding Effectiveness of Mul...

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16th International Conference on Modelling, Identification and Control, ICMIC 2024

作者： Yu, Feng Pan, Wang Haiyang, Wang Bing, Zhou Yinxia, Gao Yinjie, Wang Wei, Jia Changxin, Chen State Key Laboratory of Dynamic Measurement Technology North University of China Taiyuan030051 China School of Electrical and Control Engineering North University of China Taiyuan030051 China

ISBN: (纸本)9789819617760

For the problem of optimal shielding design of metal shielding enclosures in complex environments, multi-layer cylindrical metal enclosures is modeled and simulated by using simulation software. In the simulation, the shielding effectiveness of the multi-layer enclosures with different diameter-to-length ratios and alternating combinations of different materials is compared and analyzed. The results show that the multi-layer shielding enclosure with optimal shielding effectiveness is composed of stainless steel on the outer layer, silver on the middle layer and permalloy on the inner layer. And the larger the length-diameter ratio of multi-layer cylindrical metal enclosure, the better the shielding effect. The simulation study of electromagnetic shielding effectiveness of multi-layer cylindrical metal enclosures provides support for the study of multi-layer metal shielding enclosures in complex electromagnetic environments. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Electromagnetic shielding

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2-N,6-O sulfated chitosan evokes periosteal stem cells for bone regeneration

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Bioactive Materials 2024年第4期34卷 282-297页

作者： Luli Ji Yuanman Yu Fuwei Zhu Dongao Huang Xiaogang Wang Jing Wang Changsheng Liu Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science and TechnologyShanghai200237PR China The State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai200237PR China Engineering Research Center for Biomedical Materials of the Ministry of Education East China University of Science and TechnologyShanghai200237PR China Frontiers Science Center for Materiobiology and Dynamic Chemistry East China University of Science and TechnologyShanghai200237PR China

Musculoskeletal injuries and bone defects represent a significant clinical challenge,necessitating innovative approaches for effective bone tissue *** this study,we investigated the potential of harnessing periosteal stem cells(PSCs)and glycosaminoglycan(GAG)-mimicking materials for in situ bone *** findings demonstrated that the introduction of 2-N,6-O sulfated chitosan(26SCS),a GAG-like polysaccharide,enriched PSCs and promoted robust osteogenesis at the defect ***,26SCS amplifies the biological effect of endogenous platelet-derived growth factor-BB(PDGF-BB)through enhancing the interaction between PDGF-BB and its receptor PDGFRβabundantly expressed on PSCs,resulting in strengthened PSC proliferation and osteogenic *** a result,26SCS effectively improved bone defect repair,even in an osteoporotic mouse model with lowered PDGF-BB level and diminished regenerative *** findings suggested the significant potential of GAG-like biomaterials in regulating PSC behavior,which holds great promise for addressing osteoporotic bone defect repair in future applications.

关键词： 2-N 6-O sulfated chitosan Periosteal stem cells PDGF-BB Bone regeneration

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Recent Advances in Parity-Time Symmetry-Enabled Electromagnetic Sensors

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Progress In Electromagnetics Research B 2024年 105卷 107-121页

作者： Yang, Minye Ye, Zhilu Chen, Pai-Yen Erricolo, Danilo Department of Electrical and Computer Engineering University of Illinois Chicago ChicagoIL60607 United States State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education School of Electronic Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Manufacturing Systems Engineering The Key Laboratory of Biomedical Information Engineering of Ministry of Education Center for Mitochondrial Biology and Medicine School of Life Science and Technology International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi’an Key Laboratory for Biomedical Testing and High-end Equipment Xi’an Jiaotong University Shaanxi Xi’an710049 China

Parity-time (PT) reversal symmetry, as a representative example in the field of non-Hermitian physics, has attracted widespread research interest in the past few years due to its extraordinary wave dynamics. PT symmetry enables unique spectral singularities including the exceptional point (EP) degeneracy where two or more eigenvalues and eigenvectors coalesce, as well as the coherent perfect absorber-laser (CPAL) point where laser and its time-reversal counterpart (i.e., coherent perfect absorber) can coexist at the same frequency. These singular points not only give rise to new physical phenomena but also provide new plausibility for building the next-generation sensors and detectors with unprecedented sensitivity. To date, investigations into EPs and CPAL points have unveiled their great potential in various sensing scenarios across a broad spectral range, spanning optics, photonics, electronics, and acoustics. In this review article, we will discuss ongoing developments of EP- and CPAL-based sensors composed of PT-synthetic structures and offer a glimpse into the future research directions in this emerging field. © (2024), (Electromagnetics Academy). All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Direct Observation of Crystalline Distortions in Mechanically Exfoliated Low-symmetric 2D Materials

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Chemical Research in Chinese Universities 2023年第4期39卷 666-672页

作者： LU Huoqing SHEN Wanfu WANG Haile LIU Jiabao YU Yu MA Guoteng LIU Hongguang WU Sen HU Chunguang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072P.R.China Tianjin Institute of Metrological Supervision and Testing Tianjin 300192P.R.China

Low-symmetrical two-dimensional(LSTD)materials have been increasing rapidly as a new exciting branch of two-dimensional(2D)materials,and their intrinsic in-plane anisotropic properties have been widely applied for polar and even novel *** a measurement perspective,anisotropy is also a valuable gauge for examining the properties changes of LSTD materials but is less *** we demonstrate that the direct imaging of optical anisotropy of LSTD materials is an advanced methodology,achieving simultaneous measurement of morphology and highly sensitive intrinsic property,to examine the properties changes in the process of device *** this end,a homemade azimuth-dependent reflectance difference microscopy(ADRDM)method was applied for the optical anisotropy imaging of LSTD *** few-layered black phosphorus(BP)as an example,we observed apparent crystalline deformations in different zones of a BP crystal,revealing existing property modifications that cannot be detected by only morphology measurements of atomic force microscopy and optical ***,a large crystalline distortion of 20°was observed in a folding-existed BP flake induced by transferring *** results establish the attention on the possible property modifications in the process of mechanical exfoliation and sample transferring and suggest ADRDM is an effective tool for online examination of property changes of LSTD materials in the process of device fabrications.

关键词： Two-dimensional material Optical anisotropy Black phosphorus Microscopy Property modification Mechanical exfoliation

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Enhancing the deep-red/near-infrared fluorescence of higher rylene diimides via the chalcogen-annulation strategy

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Science China Chemistry 2024年第4期67卷 1324-1333页

作者： Kai Chen Xiao Chen Ke Hu Yilun Zhao Yujian Liu Guogang Liu Jinquan Chen Wei Jiang Zhigang Shuai Da-Hui Qu Zhaohui Wang Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistryInstitute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China State Key Laboratory of Precision Spectroscopy East China Normal University500 Dongchuan RoadShanghai 200241China

Deep-red/near-infrared fluorescence is highly suitable for bioimaging owing to its ability to deeply penetrate tissues,organs,and live ***,developing organic fluorophores with high deep-red/near-infrared fluorescence quantum yield(Φ_(FL))and fluorescent brightness remain a significant challenge owing to the energy gap ***,we developed a straightforward and effective chalcogen-annulation strategy by introducing O,S and Se into the bay region of TDI and QDI fluorophores,realizing the increase ofΦFLand fluorescent brightness up to 10 *** our best knowledge,this study potentially stands as the pioneering instance showcasing the anti-heavy-atom effect of chalcogens,and the absoluteΦFL(93%)and fluorescent brightness(128,200 cm^(-1)mol^(-1)L)of Se-TDI is among top deep-red/near-infrared organic fluorophores currently *** femtosecond transient absorption(fs-TA)measurements show the absence of obvious changes of the excited state lifetime after the introduction of chalcogens in TDI and QDI fluorophores,indicating that intersystem crossing(ISC)can be neglected in TDI and QDI *** calculations further reveal the chalcogen-annulation strategy increase the radiative rates and reduce the reorganization energy of several accepting modes at the ground state in TDI fluorophores,leading to the suppression of internal conversion(IC)*** chalcogen-annulation strategy,which effectively increases the Φ_(FL)and restricts the IC processes,while remaining unaffected by the heavy-atom effect,offers novel insights and theoretical support for the design and synthesis of deep-red/near-infrared organic fluorophores with high Φ_(FL)and fluorescent brightness.

关键词： π-extended rylene diimides chalcogen-annulation strategy deep-red/near-infrared fluorescence

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Quantitative estimation of enzymatic released specific oligosaccharides from Hericium erinaceus polysaccharides using CE-LIF

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Journal of Pharmaceutical Analysis 2023年第2期13卷 201-208页

作者： Yong Deng Jing Zhao Shaoping Li State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao SAR999078China Joint Laboratory of Chinese Herbal Glycoengineering and Testing Technology University of MacaoMacao SAR999078China Macao Centre for Testing of Chineese Medicine University of MacaoMacao SAR999078China

Polysaccharides exhibit multiple pharmacological activities which are closely related to their structural ***,quantitatively quality control of polysaccharides based on their chemical charac-teristics is important for their application in biomedical and functional food ***,poly-saccharides are mixed macromolecular compounds that are difficult to isolate and lack standards,making them challenging to quantify *** this study,we proposed an improved saccharide mapping method based on the release of specific oligosaccharides for the assessment of Hericium eri-naceus polysaccharides from laboratory cultured and different regions of ***,a polysaccharide from *** was digested by b-(1-3)-glucanase,and the released specific oligosaccharides were labeled with 8-aminopyrene-1,3,6-trisulfonic-acid(APTS)and separated by using micellar electrokinetic chromatography(MEKC)coupled with laser induced fluorescence(LIF),and quantitatively *** presented higher resolution compared to polysaccharide analysis using carbohydrate gel elec-trophoresis(PACE),and provided great peak capacity between oligosaccharides with polymerization degree of 2(DP2)and polymerization degree of 6(DP6)in a dextran ladder *** results of high performance size exclusion chromatography coupled with multi-angle laser light scattering and refractive index detector(HPSEC-MALLS-RI)showed that 12 h was sufficient for complete digestion of polysaccharides from ***(DP3)was used as an internal standard for quantifi-cation of all the *** calibration curve for DP3 showed a good linear regression(R2>0.9988).The limit of detection(LOD)and limit of quantification(LOQ)values were 0.05 mg/mL and 0.2 mg/mL,*** recovery for DP3 was 87.32(±0.03)%in the three independent *** sum up,this proposed method is helpful for improving the quality control of polysaccharides from *** as well as othe

关键词： Saccharide mapping Hericium erinaceus Polysaccharide CE-LIF PACE

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Cavitation recognition of axial piston pumps in noisy environment based on Grad-CAM visualization technique

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CAAI Transactions on Intelligence technology 2023年第1期8卷 206-218页

作者： Qun Chao Xiaoliang Wei Jianfeng Tao Chengliang Liu Yuanhang Wang State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghaiChina State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhouChina MoE Key Laboratory of Artificial Intelligence AI InstituteShanghai Jiao Tong UniversityShanghaiChina China Electronic Product Reliability and Environmental Testing Research Institute GuangzhouChina Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology GuangzhouChina

The cavitation in axial piston pumps threatens the reliability and safety of the overall hydraulic *** signal can reflect the cavitation conditions in axial piston pumps and it has been combined with machine learning to detect the pump ***,the vibration signal usually contains noise in real working conditions,which raises concerns about accurate recognition of cavitation in noisy *** paper presents an intelligent method to recognise the cavitation in axial piston pumps in noisy ***,we train a convolutional neural network(CNN)using the spectrogram images transformed from raw vibration data under different cavitation ***,we employ the technique of gradient-weighted class activation mapping(Grad-CAM)to visualise class-discriminative regions in the spectrogram ***,we propose a novel image processing method based on Grad-CAM heatmap to automatically remove entrained noise and enhance class features in the spectrogram *** experimental results show that the proposed method greatly improves the diagnostic performance of the CNN model in noisy *** classification accuracy of cavitation conditions increases from 0.50 to 0.89 and from 0.80 to 0.92 at signal-to-noise ratios of 4 and 6 dB,respectively.

关键词： axial piston pump cavitation recognition CNN Grad-CAM spectrogram image

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Four ribbons of double-layer graphene suspending masses for NEMS applications

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Microsystems & Nanoengineering 2024年第5期10卷 277-286页

作者： Xuge Fan Chang He Jie Ding Sayedeh Shirin Afyouni Akbari Wendong Zhang Advanced Research Institute of Multidisciplinary Sciences Bejing Institute of Technology100081 BeijingChina School of Integrated Circuits and Electronics Bejing Institute of Technology100081 BeijingChina Center for Interdisciplinary Science of Optical Quantum and NEMS Integration Beijing 100081China Advanced NEMS Group Ecole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland State Key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan 030051China National Key Laboratory for Electronic Measurement Technology School of Instrument and ElectronicsNorth University of ChinaTaiyuan 030051China

Graphene ribbons with a suspended proof mass for nanomechanical systems have been rarely ***,we report three types of nanomechanical devices consisting of graphene ribbons(two ribbons,four ribbons-cross and four ribbons-parallel)with suspended Si proof masses and studied their mechanical *** resonance frequencies and built-in stresses of three types of devices ranged from tens of kHz to hundreds of kHz,and from 82.61 MPa to 545.73 MPa,respectively,both of which decrease with the increase of the size of proof *** devices with four graphene ribbons featured higher resonance frequencies and spring constants,but lower built-in stresses than two ribbon devices under otherwise identical *** Young's modulus and fracture strain of double-layer graphene were measured to be 0.34 TPa and 1.13%respectively,by using the experimental data and finite element analysis(FEA)*** studies would lay the foundation for understanding of mechanical properties of graphene ribbons with a suspended proof mass and their potential applications in nanoelectromechanical systems.

关键词： proof layer double

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Metal organic framework supported niobium pentoxide nanoparticles with exceptional catalytic effect on hydrogen storage behavior of MgH_(2)

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Green Energy & Environment 2023年第2期8卷 589-600页

作者： Liuting Zhang Farai Michael Nyahuma Haoyu Zhang Changshan Cheng Jiaguang Zheng Fuying Wu Lixin Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Analysis and Testing Center Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Silicon Materials Department of Materials Science andEngineeringZhejiang UniversityHangzhou 310027China

Nb_(2)O_(5)nanoparticles with an average particle size of 10 nm supported on a rhombic dodecahedral metal organic framework(MOF)were successfully synthesized by a facile one-pot hydrothermal reaction and subsequent calcination *** results demonstrated that the prepared catalyst drastically improved the hydrogen storage behavior of MgH_(2).7 wt%Nb_(2)O_(5)@MOF doped MgH_(2)started to desorb hydrogen at 181.9℃and 6.2 wt%hydrogen could be released within 2.6 min and 6.3 min at 275℃and 250℃,*** fully dehydrogenated composite also displayed excellent hydrogenation by decreasing the onset absorption temperature to 25℃and taking up4.9 wt%and 6.5 wt%hydrogen within 6 min at 1750C and 1500C,***,the corresponding activation energy was calculated to be 75.57±4.16 kJ mol^(-1)for desorption reaction and 51.38±1.09 kJ mol^(-1)for absorption *** 20 cycles,0.5 wt%hydrogen capacity was lost for the MgH_(2)+7 wt%Nb_(2)O_(5)@MOF composite,much lower than 1.5 wt%of the MgH_(2)+7 wt%Nb_(2)O_(5)***,the addition of Nb_(2)O_(5)@MOF had limited effect on reducing the dehydrogenation enthalpy of MgH_(2).Microstructure analysis revealed that Nb_(2)O_(5)particles were uniformly distributed on surface of the MgH_(2)matrix and synergistically improved the hydrogen storage property of MgH_(2)with MOF.

关键词： Hydrogen storage MgH_(2) Nb_(2)O_(5)@MOF Reversibility Catalytic mechanism

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