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Applied mathematics and Mechanics(English Edition) 2020年第5期41卷 805-818页

作者： Weichao CHI s.j.ma j.Q.sUN College of science Northeastern UniversityShenyang 100819China Key Laboratory of Ministry of Education on safe Mining of Deep Metal Mines Northeastern UniversityShenyang 100819China Department of Mechanical Engineering School of EngineeringUniversity of CaliforniaMercedCA 95343U.S.A.

The hybrid vibration isolation, which takes advantages of both the passive and active approaches, has been an important solution for space missions. The objective of this paper is to design a vibration isolation platform for payloads on spacecrafts with the robust, wide bandwidth, and multi-degree-of-freedom(MDOF). The proposed solution is based on a parallel mechanism with six voice-coil motors(VCMs) as the actuators. The linear active disturbance resistance control(LADRC) algorithm is used for the active control. Numerical simulation results show that the vibration isolation platform performs effectively over a wide bandwidth, and the resonance introduced by the passive isolation is eliminated. The system robustness to the uncertainties of the structure is also verified by simulation.

关键词： hybrid vibration isolation stewart platform linear active disturbance rejection control(LADRC) stability robustness

synergistic effect of silicon availability and salinity on metal adsorption in a common estuarine diatom

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journal of Environmental sciences 2025年第2期148卷 364-374页

作者： Fengyuan Chen jie ma Ke Pan sZU-HKUsT joint PhD Program in marine Environmental science Shenzhen UniversityShenzhen 518060China shenzhen Key Laboratory of marine Microbiome Engineering Institute for Advanced StudyShenzhen UniversityShenzhen 518060China Department of Ocean science The Hong Kong University of Science and TechnologyHong Kong 999077China

Increasing nitrogen and phosphorus discharge and decreasing sediment input have made silicon(si)a limiting element for diatoms in *** in nutrient structure and salinity fluctuation can greatly affect metal uptake by estuarine ***,the combined effects of si and salinity on metal accumulation in these diatoms have not been *** this study,we aimed to investigate how salinity and si availability combine to influence the adsorption of metals by a widely distributed diatom Phaeodactylum *** data indicate that replete si and low salinity in seawater can enhance cadmium and copper adsorption onto the diatom *** the single-cell level,surface potential was a dominant factor determining metal adsorption,while surface roughness also contributed to the highermetal loading capacity at lower *** a combination of noninvasive micro-test technology,atomic force microscopy,X-ray photoelectron spectroscopy,and Fourier transform infrared spectroscopy,we demonstrate that the diversity and abundance of the functional groups embedded in diatom cell walls vary with salinity and si *** results in a change in the cell surface potential and transient metal *** study provides novel mechanisms to explain the highly variable metal adsorption capacity of a model estuarine diatom.

关键词： Diatom Metal adsorption silicon salinity Functional group surface potential

Conversion-type cathode materials for high energy density solid-state lithium batteries

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journal of Energy Chemistry 2025年第1期100卷 409-425页

作者： Yuhao ma shihong Qing Hongyu Liu Chuntao ma Yuan Yu Chuang Yu Liping Wang school of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Zhejiang Provincial Key Laboratory of Fiber materials and manufacturing Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina state Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

solid-state lithium batteries(ssLBs)are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,ssLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of ssLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes(ssEs),as well as state-of-the-art progress in various promising cathodes(e.g.,Fes_(2),Cus,FeF_(3),FeF_(2),and s)in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the s cathode stands out impressively,while sulfide ssEs and halide ssEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density ssLBs.

关键词： Conversion-type cathode Lithium-free cathode solid-state electrolyte solid-state lithium battery High energy density

Fracture behavior of sandstone with partial filling flaw under mixed-mode loading: Three-point bending tests and discrete element method

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journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 291-308页

作者： Dongdong ma Yu Wu Xiao ma Xunjian Hu Wenbao Dong Decheng Li Lingyu Li state Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China state Key Laboratory of structural Health and safety of Bridges Wuhan430034China Research Center of Coastal and Urban Geotechnical Engineering Zhejiang UniversityHangzhou310058China state Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The fracture behavior of natural fracture in the geological reservoir subjected to filling property,affects the crack initiation and propagation under stress *** filling flaws were intermediate between open fractures and filled fractures,the fracture response may be worth *** this work,the effect of the filling property of sandstone with partial filling flaws on the fracture behavior was systematically investigated based on three-point bending tests and the numerical approach of discrete element method(DEM).In the laboratory,semi-circular three-point bending tests were carried out with partial filling flaws of various filling *** on this,numerical simulations were used to further investigate the effect of the filling ratio and the inclination of the partial filling flaw on the mechanical and fracture responses,and the effect of the partial filling flaw under mixed-mode loading on the fracture mechanism was elucidated coupled with acoustic emission(AE)*** obtained results showed that the increase in filling strength and filling ratio of partial filling flaw led to an increase in peak strength,with a decreasing trend in peak strength with the inclination of partial filling *** terms of crack propagation pattern,the increasing filling strength of the partial filling flaw induced the transformation of the fracture mechanism toward deflection,with a tortuosity path,while the filling ratio and inclination of partial filling flaw led to fracture mechanism change from deflection to penetration and attraction,accompanied with a larger AE event source in ***,the b-value based on the Gutenberg-Richter equation fluctuated between 5 and 4 at low filling ratio and inclination and remained around 5 at high filling ratio and inclination of partial filling *** results may provide an application prospective for reservoir stimulation using the natural fracture system.

关键词： Partial filling flaw Mixed-mode loading semi-circular three-point bending Acoustic emission(AE) b-value

Differential-geometry-based multi-dimensional joint position-velocity estimation using Crab pulsar profile distortion

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Chinese journal of Aeronautics 2025年第1期38卷 551-567页

作者： jin LIU Huanzi ZHANG Xiaolin NING Xin ma school of Electronic Information Wuhan University of Science and TechnologyWuhan 430081China school of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Hefei National Laboratory Hefei 230088China

The traditional orbit determination method based on pulsar profile distortion can determine the six elements of the ***,the estimation accuracies of these methods are limited and the computational load of a six-dimensional search is *** solve this problem,the differential-geometry-based Multi-dimensional joint Position-Velocity Estimation(MjPVE)using Crab pulsar profile distortion is proposed in this ***,through theoretical analysis,it is found that the pulsar profile distortion caused by the initial state error in some joint positionvelocity directions is very *** other words,the accuracies of estimation in these directions are very ***,the search dimension can be reduced,which in turn greatly reduces the computational ***,we construct the chi-squared function of the pulsar profile with respect to the estimation error in joint position-velocity direction and use differential geometry to find the joint position-velocity directions corresponding to different degrees of ***,we utilize the grid search based on directory folding in these joint position-velocity directions corresponding to large degrees of distortion to obtain the joint position-velocity *** experimental results show that compared with the grouping bi-chi-squared inversion method,MjPVE has high precision and extensive navigation information.

关键词： joint Position-Velocity Estimation Pulsars Profile Distortion Orbit Determination Differential Geometry

Engineering strategies of biomaterial-assisted exosomes for skin wound repair:Latest advances and challenges

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Chinese Chemical Letters 2025年第1期36卷 99-109页

作者： Yang Xu Le ma Yang Wang Chunmeng shi Institute of Rocket Force Medicine State Key Laboratory of Trauma and Chemical PoisoningThird Military Medical University(Army Medical University)Chongqing 400038China

The treatment of skin wounds,especially chronic wounds,remains a critical clinical challenge and places a heavy burden on patients and healthcare *** recent years,the engineering strategy of using biomaterial-assisted exosomes has emerged as a powerful tool for skin *** to treatments such as debridement and regular dressing changes,the design of biomaterial-assisted exosomes not only maintains the bioactivity of exosomes at the wound site but also provides an appropriate microenvironment for the repair of complex tissues,thereby accelerating wound *** review systematically introduces the general characteristics of exosomes and their functions in skin wound healing,highlights recent advances in classification of natural exosomes and engineering methods which enriching their functions in intercellular ***,various emerging and innovative approaches based on biomaterials delivery of exosomes are comprehensively *** review seeks to bring an in-depth understanding of bioactive dressings based on exosomes therapeutic strategies,aiming to facilitate new clinical application value.

关键词： Exosomes Biomaterials Hydrogel Delivery system Wound healing

A fast amplitude preserving three-parameter 3D parabolic Radon transform and its application on multiple attenuation

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Petroleum science 2025年第1期22卷 163-177页

作者： ji-Tao ma Kai-Ge Zhao Zhen Liao College of Geophysics China University of Petroleum (Beijing) state Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) CNPC Key Laboratory of Geophysical Prospecting China University of Petroleum (Beijing)

seismic wavefields propagate through three-dimensional(3D) space, and their precise characterization is crucial for understanding subsurface structures. Traditional 2D algorithms, due to their limitations, are insufficient to fully represent three-dimensional wavefields. The classic 3D Radon transform algorithm assumes that the wavefield's propagation characteristics are consistent in all directions, which often does not hold true in complex underground media. To address this issue, we present an improved 3D threeparameter Radon algorithm that considers the wavefield variation with azimuth and provides a more accurate wavefield description. However, introducing new parameters to describe the azimuthal variation also poses computational challenges. The new Radon transform operator involves five variables and cannot be simply decomposed into small matrices for efficient computation; instead, it requires large matrix multiplication and inversion operations, significantly increasing the computational load. To overcome this challenge, we have integrated the curvature and frequency parameters, simplifying all frequency operators to the same, thereby significantly improving computation efficiency. Furthermore,existing transform algorithms neglect the lateral variation of seismic amplitudes, leading to discrepancies between the estimated multiples and those in the data. To enhance the amplitude preservation of the algorithm, we employ orthogonal polynomial fitting to capture the amplitude spatial variation in 3D seismic data. Combining these improvements, we propose a fast, amplitude-preserving, 3D threeparameter Radon transform algorithm. This algorithm not only enhances computational efficiency while maintaining the original wavefield characteristics, but also improves the representation of seismic data by increasing amplitude fidelity. We validated the algorithm in multiple attenuation using both synthetic and real seismic data. The results demonstrate that the new algor

关键词： Three-parameter 3D Radon Orthogonal polynomial Amplitude-preserving Multiple attenuation

magnetron sputtered nickel oxide with suppressed interfacial defect states for efficient inverted perovskite solar cells

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journal of Energy Chemistry 2025年第1期100卷 348-355页

作者： Guoqiang ma Qin Tan Zhaoning Li jingwei Xiu jiafeng Wang Tianle Cheng Dong He Qiang sun Xuhang ma Francesco Lamberti Zhubing He Department of materials science and Engineering Institute of Innovative Materials(I2M)Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation(FSSEG)Southern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina Core Research Facilities Southern University of Science and TechnologyShenzhen 518055GuangdongChina Department of Chemical sciences Department of Industrial EngineeringUniversity of PadovaVia Gradenigo 6a35131 PadovaItaly

Widely used spin-coated nickle oxide (NiOx) based perovskite solar cells often suffer from severe interfacial reactions between the NiOxand adjacent perovskite layers due to surface defect states,which inherently impair device performance in a long-term view,even with surface molecule *** this study,we developed high-quality magnetron-sputtered NiOxthin films through detailed process optimization,and compared systematically sputtered and spin-coated NiOxthin film surfaces from materials to *** sputtered NiOxfilms exhibit improved crystallinity,smoother surfaces,and significantly reduced Ni3+or Ni vacancies compared to their spin-coated ***,the interface between the perovskite and sputtered NiOxfilm shows a substantially reduced density of defect *** solar cells (PsCs) fabricated with our optimally sputtered NiOxfilms achieved a high power conversion efficiency (PCE) of up to 19.93%and demonstrated enhanced stability,maintaining 86.2% efficiency during 500 h of maximum power point tracking under one standard sun ***,with the surface modification using (4-(2,7-dibromo-9,9-dimethylacridin-10(9H)-yl)butyl)p hosphonic acid (DmacPA),the device PCE was further promoted to 23.07%,which is the highest value reported for sputtered NiOxbased PsCs so far.

关键词： Nickle oxide magnetron sputter Defect stability Perovskite solar cell

Optimizing battery deployment: Aging trajectory prediction enabling homogenous performance grouping

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journal of Energy Chemistry 2025年第1期100卷 565-577页

作者： shuquan Wang Feng Gao Zhan ma Hao Tian Yusen Zhang school of Control science and Engineering Shandong UniversityJinan 250061ShandongChina Key Lab of Power system Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061ShandongChina

As battery deployments in electric vehicles and energy storage systems grow, ensuring homogeneous performance across units is crucial. We propose a multi-derivative imaging fusion(MDIF) model, employing advanced imaging and machine learning to predict battery aging trajectories from minimal initial data, thus facilitating effective performance grouping before deployment. Utilizing a derivative strategy and Gramian Angular Difference Field for dimensional enhancement, the MDIF model uncovers subtle predictive features from discharge curve data after only ten cycles. The architecture includes a parallel convolutional neural network with lateral connections to enhance feature integration and *** on a self-developed dataset, the model achieves an average root-mean-square error of 0.047 Ah and an average mean absolute percentage error of 1.60%, demonstrating high precision and *** robustness is further validated through transfer learning on two publicly available datasets, adapting with minimal retraining. This approach significantly reduces the testing cycles required, lowering both time and costs associated with battery testing. By enabling precise battery behavior predictions with limited data, the MDIF model optimizes battery utilization and deployment strategies, enhancing system efficiency and sustainability.

关键词： Lithium-ion battery Battery prognostics Fusion model Convolutional neural network Transfer learning

Biogenic emission as a potential source of atmospheric aromatic hydrocarbons:Insights from a cyanobacterial bloom-occurring eutrophic lake

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journal of Environmental sciences 2025年第5期151卷 497-504页

作者： Hua Fang Ting Wu shutan ma Yuqing Miao Xinming Wang school of Ecology and Environment Anhui Normal UniversityWuhu 241000China Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt Wuhu 241000China school of Geography and Tourism Anhui Normal UniversityWuhu 241000China state Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAs Center for Excellence in Deep Earth science Guangzhou 510640China

As important precursors of ozone(O_(3))and secondary organic aerosol(sOA),reactive aromatic hydrocarbons(AHs)have typically been classified as anthropogenic air ***,biogenic emission can also be a potential source of atmospheric ***,field observations in a eutrophic lake were combined with laboratory incubation experiments to investigate the biogenic AH *** work showed that the water-air fluxes of AHs measured at sites with high cyanobacteria abundance could reach an order of magnitude greater than those at sites with low cyanobacteria abundance,suggesting that cyanobacteria could be the important contributor to measured *** incubation experiments further confirmed the AH emission of cyanobacteria and revealed that the emission could change significantly over the lifespan of cyanobacteria and varied to their growing *** combining field observations and laboratory incubation experiments,it has been suggested that the emission of different AH species from cyanobacteria could be modulated by variable biogeochemical mechanisms and that the biochemical process of toluene could be different from that of other *** study investigates AH emissions from inland aquatic ecosystem and suggests that biogenic emission could be a potential source of atmospheric AHs.

关键词： Aromatic hydrocarbons Biogenic emission Eutrophic lake Cyanobacteria Biosphere-atmosphere exchange