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SEFormer:A Lightweight CNN-Transformer Based on Separable Multiscale Depthwise Convolution and Efficient Self-Attention for Rotating Machinery Fault Diagnosis

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Computers, Materials & Continua 2025年第1期82卷 1417-1437页

作者： Hongxing wang Xilai Ju hua Zhu huafeng Li State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China School of Computer Science and Engineering Nanyang Technological UniversitySingapore639798Singapore

Traditional data-driven fault diagnosis methods depend on expert experience to manually extract effective fault features of signals,which has certain ***,deep learning techniques have gained prominence as a central focus of research in the field of fault diagnosis by strong fault feature extraction ability and end-to-end fault diagnosis ***,utilizing the respective advantages of convolution neural network(CNN)and Transformer in local and global feature extraction,research on cooperating the two have demonstrated promise in the field of fault ***,the cross-channel convolution mechanism in CNN and the self-attention calculations in Transformer contribute to excessive complexity in the cooperative *** complexity results in high computational costs and limited industrial *** tackle the above challenges,this paper proposes a lightweight CNN-Transformer named as SEFormer for rotating machinery fault ***,a separable multiscale depthwise convolution block is designed to extract and integrate multiscale feature information from different channel dimensions of vibration ***,an efficient self-attention block is developed to capture critical fine-grained features of the signal from a global ***,experimental results on the planetary gearbox dataset and themotor roller bearing dataset prove that the proposed framework can balance the advantages of robustness,generalization and lightweight compared to recent state-of-the-art fault diagnosis models based on CNN and *** study presents a feasible strategy for developing a lightweight rotating machinery fault diagnosis framework aimed at economical deployment.

关键词： CNN-Transformer separable multiscale depthwise convolution efficient self-attention fault diagnosis

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Structural Modal Parameter Recognition and Related Damage Identification Methods under Environmental Excitations: A Review

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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

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Impact of Spinal Manipulative Therapy on Brain Function and Pain Alleviation in Lumbar Disc Herniation:A Resting-State fMRI Study

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Chinese Journal of Integrative Medicine 2025年第2期31卷 108-117页

作者： ZHOU Xing-chen WU Shuang wang Kai-zheng CHEN Long-hao WEI Zi-cheng LI Tao hua Zi-han XIA Qiong LYU Zhi-zhen LYU Li-jiang Department of Spine The Third Affiliated Hospital of Zhejiang Chinese Medicine UniversityHangzhou(310053)China Department of Spine The Third School of Clinical MedicineZhejiang Chinese Medicine UniversityHangzhou(310053)China Research Institute of Tuina(Spinal Disease) Zhejiang Chinese Medicine UniversityHangzhou(310053)China

Objective:To elucidate how spinal manipulative therapy(SMT)exerts its analgesic effects through regulating brain function in lumbar disc herniation(LDH)patients by utilizing resting-state functional magnetic resonance imaging(rs-f MRI).Methods:From September 2021 to September 2023,we enrolled LDH patients(LDH group,n=31)and age-and sex-matched healthy controls(HCs,n=28).LDH group underwent rs-f MRI at 2 distinct time points(TPs):prior to the initiation of SMT(TP1)and subsequent to the completion of the SMT sessions(TP2).SMT was administered once every other day for 30 min per session,totally 14 treatment sessions over a span of 4 *** did not receive SMT treatment and underwent only one f MRI ***,participants in LDH group completed clinical questionnaires on pain using the Visual Analog Scale(VAS)and the Japanese Orthopedic Association(JOA)score,whereas HCs did not undergo clinical scale *** effects on the brain were jointly characterized using the amplitude of low-frequency fluctuations(ALFF)and regional homogeneity(Re Ho).Correlation analyses were conducted between specific brain regions and clinical ***:Following SMT treatment,pain symptoms in LDH patients were notably alleviated and accompanied by evident activation of effects in the *** comparison to TP1,TP2 exhibited the most significant increase in ALFF values for Temporal_Sup_R and the most notable decrease in ALFF values for Paracentral_Lobule_L(voxelwise P30;FDR correction).Additionally,the most substantial enhancement in Re Ho values was observed for the Cuneus_R,while the most prominent reduction was noted for the Olfactory_R(voxelwise P30;FDR correction).Moreover,a comparative analysis revealed that,in contrast to HCs,LDH patients at TP1 exhibited the most significant increase in ALFF values for Temporal_Pole_Sup_L and the most notable decrease in ALFF values for Frontal_Mid_L(voxelwise P30;FDR correction).Fur

关键词： functional magnetic resonance imaging lumbar disc herniation spinal manipulative therapy pain

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A new multi-DOF envelope forming process for fabricating spiral bevel gears with back taper tooth

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Chinese Journal of Aeronautics 2025年第1期38卷 568-585页

作者： Xinghui HAN Yanhui wang Lin hua Wuhao ZhuaNG Fangyan ZHENG Wei FENG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

Spiral bevel gears are critical transmission components,and are widely used in the aerospace *** paper proposes a new multi-DOF envelope forming process for fabricating spiral bevel ***,the multi-DOF envelope forming principle of spiral bevel gears is ***,the design methods for the envelope tool geometry and movement are proposed based on the envelope geometry and movement ***,the metal flow and tooth filling laws are revealed through 3D FE simulation of the multi-DOF envelope forming process of a typical spiral bevel ***,a new method for separating the envelope tool and the formed spiral bevel gear with back taper tooth is proposed to avoid their ***,experiments on multi-DOF envelope forming of this typical spiral bevel gear are conducted using new heavy load multi-DOF envelope forming *** simulation and experimental results show the feasibility of the proposed multi-DOF envelope forming process for fabricating spiral bevel gears with back taper tooth and the corresponding process design methods.

关键词： Multi-DOF envelope forming Spiral bevel gear Back taper tooth Metal flow Process design

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Efficacy and Safety of Juan Bi Pill with Add-on Methotrexate in Active Rheumatoid Arthritis:A 48-Week,Multicentre,Randomized,Double-Blind,and Placebo-Controlled Trial

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Chinese Journal of Integrative Medicine 2025年第2期31卷 99-107页

作者： JIA Qing-yun wang Yi-ru SUN Da-wei MAO Jian-chun XUE Luan GU Xiao-hua YU Xiang PIAO Xue-mei XU hao LIANG Qian-qian Spine Institute Longhua Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai(200032)China Spine Institute Shanghai University of Traditional Chinese MedicineShanghai(200032)China Key Laboratory of Theory and Therapy of Muscles and Bones Ministry of Education(Shanghai University of Traditional Chinese Medicine)Shanghai(201203)China Department of Orthopedics Linyi People's HospitalLinyiShandong Province(273000)China Department of Orthopedics Yueyang Hospital of Integrated Traditional Chinese and Western Medicine Affiliated to Shanghai University of Traditional Chinese MedicineShanghai(200437)China Department of Orthopedics the Seventh People's Hospital of Shanghai University of Traditional Chinese MedicineShanghai(200137)China

Objective:To explore the efficacy and safety of Juan Bi Pill(JBP)in treatment of active rheumatoid arthritis(RA).Methods:From February 2017 to May 2018,115 participants from 4 centers were randomly divided into JBP group(57 cases)and placebo group(58 cases)in a 1:1 ratio using a random number table *** received a dose of JBP(4 g,twice a day,orally)combined with methotrexate(MTX,10 mg per week)or placebo(4 g,twice a day,orally)combined with MTX for 12 *** were required with follow-up visits at 24 and 48 weeks,attending 7 assessment *** were undergo disease activity assessment 7 times(at baseline and 2,4,8,12,24,48 weeks)and safety assessments 6 times(at baseline and 4,8,12,24,48 weeks).The primary endpoint was 28-joint Disease Activity Score(DAS28-ESR and DAS28-CRP).The secondary endpoints included American College of Rheumatology(ACR)criteria for 20%and 50%improvement(ACR20/50),Health Assessment Questionnaire Disability Index(HAQ-DI),clinical disease activity index(CDAI),visual analog scale(VAS),Short Form-36(SF-36)score,Medial Outcomes Study(MOS)sleep scale score,serum erythrocyte sedimentation rate(ESR),C-reactive protein(CRP),tender joint count,swollen joint count,and morning *** adverse reactions were observed during the ***:After 12 weeks of treatment,DAS28-ESR and DAS28-CRP scores in both groups were lower than before treatment(both P<0.01),while the remission rate of DAS28-ESR and DAS28-CRP and low disease activity of JBP group were higher than those in the placebo group(both P<0.01).JBP demonstrated better efficacy on ACR20 and ACR50 compliance rate at 12 and 48 weeks comparing to placebo(all P<0.05).The CDAI and HAQ-DI score,pain VAS and global VAS change of RA patients and physicians,the serum ESR and CRP levels,and the number of tenderness and swelling joints were lower than before treatment at 4,8,12,24,48 weeks in both groups(P<0.05 or P<0.01),while the reduction of above indices in

关键词： Chinese medicine Juan Bi Pill methotrexate active rheumatoid arthritis randomized controlled trial

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Synthesis and high frequency structure simulator electromagnetic simulation of hollow NC@CeO_(2)nanospheres for broad absorption bandwidth

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 678-688页

作者： Shuhao Yang Peiyan Zhao Xianyong Lu Xiaoyuan hao Yufan Wu Huiya wang Tao Zhou Guangsheng wang Hangzhou International Innovation Institute Beihang UniversityHangzhou 311115China School of Chemistry Beihang UniversityBeijing 100191China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China School of Chemistry and Chemical Engineering Lingnan Normal UniversityZhanjiang 524048China

Recent progress in microwave absorption materials stimulates the extensive exploration of rare earth oxide ***,we report the synthesis of a hollow sphere-based carbon material compounded with rare earth *** N-doped carbon nano-spheres loaded ceria composites(H-NC@CeO_(2))were designed and prepared by the template method,combined with in-situ coating,pyrolysis and chemical *** controlling the loading content of H-NC@CeO_(2)and adjusting the impedance matching of the material,the H-NC@CeO_(2)/PS(polystyrene)composite exhibited a minimum reflection loss(RL)of-50.8 dB and an effective absorption band-width(EAB)of 4.64 GHz at a filler ratio of 20wt%and a thickness of 2 *** accordance with measured electromagnetic parameters,simulations using the high frequency structure simulator(HFSS)software were conducted to investigate the impact of the honeycomb structure on the electromagnetic wave performance of H-NC@CeO_(2)/*** calculating the surface electric field and the material’s bulk loss density,the mechanism of electromagnetic loss for the honeycomb structure was elaborated.A method for structural design and man-ufacturing of broadband absorbing devices was proposed and a broadband absorber with an EAB of 11.9 GHz was *** study presents an innovative approach to designing advanced electromagnetic(EM)wave absorbing materials with broad absorption band-widths.

关键词： rare earth oxides carbon matrix composites hollow structure electromagnetic simulation

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Lattice-mismatch-induced formation of defect-rich Pd-Cu alloy nanocages for enhanced formic acid oxidation activity

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Science China Chemistry 2025年第2期68卷 481-491页

作者： Zhaojun Liu Zhengyan wang Zhaoyu wang hao Yuan Yuke Bai Xiaoxiao wang Zerui Mu Chunxia Wu Kai Liu Zhun Hu Chuanbo Gao Sate Key Laboratory of Multiphase Flow in Power Engineering Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Institute of Industrial Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China

Crystallographic defects in noble metal nanocrystals are recognized as highly active catalytic sites,significantly enhancing activities in many important *** their importance,synthesizing noble metal nanocrystals with a high density of defects poses a considerable synthetic ***,we present a novel lattice mismatch-induced formation mechanism to create high-density defects in noble metal *** approach takes advantage of lattice mismatch to enable nonepitaxial nucleation and growth of a noble metal on a foreign metal substrate,forming abundant noble metal crystallites with random lattice orientations not dictated by the substrate *** these crystallites grow extensively,they merge,forming numerous grain boundaries and yielding defect-rich noble metal ***-rich alloy nanocrystals can also be synthesized through a subsequent vacancy-diffusion alloying *** take defective PdCu alloy nanocages as an example and demonstrate the effectiveness of crystallographic defects in enhancing catalytic performance of noble metal *** nanocages exhibit superior activity in the electrocatalytic formic acid oxidation reaction,which is 1.6 times greater than their defect-free *** strategy offers a new avenue for creating defect-rich noble metal nanocrystals as highly efficient catalysts for a wide array of catalytic applications.

关键词： noble metal nanocrystals defects non-epitaxial growth electrocatalysis formic acid oxidation reaction

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Research progress of catalysts for direct coal liquefaction

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Journal of Energy Chemistry 2025年第1期100卷 481-497页

作者： Wei Song Penggao Liu Xinyue Chen Ting wang Chunrong He Rui hao Kaiyu Liu State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830017XinjiangChina College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454003HenanChina Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina

Coal direct liquefaction technology is a crucial contemporary coal chemical technology for efficient and clean use of coal resources. The development of direct coal liquefaction technology and the promotion of alternative energy sources are important measures to guarantee energy security and economic security. However, several challenges need to be addressed, including low conversion rate, inadequate oil yield, significant coking, demanding reaction conditions, and high energy consumption. Extensive research has been conducted on these issues, but further exploration is required in certain aspects such as pyrolysis of macromolecules during the liquefaction process, hydrogen activation, catalysts' performance and stability, solvent hydrogenation, as well as interactions between free radicals to understand their mechanisms better. This paper presents a comprehensive analysis of the design strategy for efficient catalysts in coal liquefaction, encompassing the mechanism of coal liquefaction, catalyst construction,and enhancement of catalytic conversion efficiency. It serves as a comprehensive guide for further research endeavors. Firstly, it systematically summarizes the conversion mechanism of direct coal liquefaction, provides detailed descriptions of various catalyst design strategies, and especially outlines the catalytic mechanism. Furthermore, it addresses the challenges and prospects associated with constructing efficient catalysts for direct coal liquefaction based on an understanding of their action mechanisms.

关键词： Direct coal liquefaction Catalysts Mechanismof action Solvent hydrogenation

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Emission characteristics of biogenic volatile organic compounds in a subtropical pristine forest of southern China

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Journal of Environmental Sciences 2025年第2期148卷 665-682页

作者： Xi Chen Daocheng Gong Youjing Lin Qiao Xu Yujin wang Shiwei Liu Qinqin Li Fangyuan Ma Jiangyong Li Shuo Deng hao wang Boguang wang Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong Provincial Observation and Research Station for Atmospheric Environment and Carbon Neutrality in Nanling Forests China Australia-China Centre for Air Quality Science and Management(Guangdong) Guangzhou 511443China Hainan Provincial Ecological and Environmental Monitoring Center Haikou 571126China

Emission characteristics of biogenic volatile organic compounds(BVOCs)from dominant tree species in the subtropical pristine forests of China are extremely *** we conducted in situ field measurements of BVOCs emissions from representative mature evergreen trees by using dynamic branch enclosures at four altitude gradients(600-1690ma.s.l.)in the Nanling Mountains of southern *** characteristics as well as seasonal and altitudinal variations were *** emission rates and canopyscale emission factors were then *** showed that BVOCs emission intensities in the wet season were generally higher than those in the dry *** were the dominant BVOCs emitted from most broad-leaved trees,accounting for over 70%of the *** superba,Yushania basihirsuta and Altingia chinensis had relatively high emission intensities and secondary pollutant formation *** localized emission factors of isoprene were comparable to the defaults in the Model of Emissions of Gases and Aerosols fromNature(MEGAN),while emission factors of monoterpenes and sesquiterpenes were 2 to 58 times of those in the *** results can be used to update the current BVOCs emission inventory in MEGAN,thereby reducing the uncertainties of BVOCs emission estimations in forested regions of southern China.

关键词： Biogenic volatile organic compounds(BVOCs) Dynamic enclosure system Nanling Mountains Emission factors Emission rates Chemical reactivity

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Positive effect of Mo on mechanical properties of a Ni-42W-10Co-xMo medium heavy alloy

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China Foundry 2025年第1期22卷 108-116页

作者： Guo-xin Cao Jian-xin Dong Yong-sheng He He Jiang Fang hao Zhi-hua Nie Teng-fei Ma Bao-quan Fu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Xi'an Superalloy Technology Co. Ltd.Xi’an 710299China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina

In this study,a novel Ni-W-Co-Mo medium heavy alloy(MHA)was designed to improve its mechanical strength via Mo *** the Ni-42W-10Co-x Mo alloy series,where x represents the weight percent of Mo and varies between 0,1,2,5,and 10,the microstructure transitions from a dendritic structure to a hypo-eutectic structure as the Mo content increases from 0 to 5wt.%.Moreover,as the Mo content increases from 0 to 10wt.%,the distribution of theμ-phase shifts from being individually dispersed to forming aggregates,and its volume fraction rises from 0.5%to 7.9%.Notably,theμ-phase evolves into an eutectic microstructure,which helps in minimizing the segregation of *** change is accompanied by a substantial enhancement in mechanical properties;specifically,the compressive yield strength at room temperature increases from 350 MPa to 646 MPa,indicating a significant 85%***,the microhardness increases from 230 HV to 304 *** dynamics simulations further reveal that the strengthening mechanism of Ni-42W-10Co-x Mo alloys is Mo-induced solid solution strengthening and precipitation strengthening.

关键词： medium-heavy alloys Ni-based alloy mechanical properties solid solution strengthening precipitation strengthening

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