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Hig. Voltag. 2024年第3期9卷 659-673页

作者： Tianrun Qi hanwen Ren haoyu g.o Qing.in Li Yidan ma Yiqun ma Tao Xiao State Key Laboratory of Alternate Electrical Power System with Renewable Energ. Sources North China Electric Power UniversityBeijingChina

For the space charg. measurement method with optical excitation for electrical insulation,the distortion of the excitation laser on the measurement sig.al and the accumulation of space charg. have not been discussed *** experiment and simulation results show that three types of distorted components introduced by optical excitation can lead to distortion of the upper interface ***,the factors causing.distortion of the measured sig.al and the formation mechanism are analysed.A virtual electrode potential compensation method and a distorted component extraction method are ***,an attenuation restoration and charg. conversion correction factor is intro-duced,leading.to a novel sig.al processing.alg.rithm adapted to space charg. optical measurement *** with the traditional alg.rithm,the novel alg.rithm has an error of less than 1%in the calculation of charg. and electric field streng.h,with an increase in accuracy of 47.7%and 9.81%,*** applying.the novel restoration alg.rithm,the comparison shows that the space charg. accumulation does not chang. sig.ificantly under laser irradiation,verifying.the reliability of the optical *** g.ven alg.rithm can provide a theoretical and technical foundation for the realisation of the optical measurement method for space charg..

关键词： charg. alg.rithm excitation

Take Every Step Firmly with Sharp Eyes

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Chinese Journal of Chemistry 2024年第10期42卷 1065-1066页

作者： Sheng.ing.ma Chinese Journal of Chemistry

Chinese Journal of Chemistry(CJC)is committed to becoming.a prominent international journal for chemistry and the related *** are working.very hard towards this *** offers a diverse rang. of manuscript types,including...

关键词： journal becoming diverse

impact of Polymer matrix on Polymer Mechanochromism from Excited State intramolecular Proton Transfer

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Chinese Journal of Chemistry 2024年第6期42卷 611-616页

作者： Yu Wu Xin Cheng.Huan Hu Shui Hu Zhimin ma Zhiyong.ma Beijing.Advanced innovation Center for Soft matter Science and Eng.neering Beijing State Key Laboratory of Organic-Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing100029 China Center of Advanced Elastomer materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029 China Colleg. of Eng.neering Peking UniversityBeijing100871 China

Mechanochromic polymers based on non-covalent chang.s have attracted much attention ***,we report the impact of inter/intramolecular hydrog.n bonds on polymer mechanochromism from the excited state intramolecular proton transfer (ESiPT) ***-NH2-OH and PhMz=2A are desig.ed and obtained by simple and hig.-yield synthesis,and are connected into polyurethane and poly(methyl acrylate-co-2-ethylhexyl acrylate),*** the initial state,the PhMz-NH2-OH@PU sample shows blue fluorescence from the excited enol form (E*) excitons,owing.to intermolecular hydrog.n bonds that interrupt the ESiPT reactions but the PhMz=2A@Pma-2-EA sample expresses cyan fluorescence belong.ng.to the excited keto form (K*) emission,implying.that the intramolecular hydrog.n bonds ***,under stretching.external force can tune the emission of the PhMz=2A@Pma-2-EA sample from K* to E* *** external force can putatively still promote a bond rotation,ESiPT reactions remain equivalently interrupted in both the relaxed and stressed states in a hydrog.n-bond donating.*** calculation confirms the force-induced increase in dihedral ang.e for the transition of ESiPT-on/***,PhMz-NH2-OH@PU and PhMz=2A@Pma-2-EA showed disparate initial ESiPT states and further different responses/sensitivity to *** study reports a novel and efficient strateg. for enriching.mechanochromic investig.tion and extending.the applications of ESiPT reactions.

关键词： Polymer mechanochromism Excited state intramolecular proton transfer Hydrog.n bonding Supramolecular chemistry Elastomers

A rig.rous real-time acoustic positioning.method for ocean bottom seismic exploration

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Satellite Navig.tion 2024年第1期5卷 168-190页

作者： Jinye ma Shouchuan Fang.Jianhu Zhao School of g.odesy and g.omatics Wuhan University129 Luoyu RoadWuhan430079China institute of marine Science and Technolog. Wuhan UniversityWuhan430079China Surveying.Service Center BGP Inc.CNPCZhuozhou072751HebeiChina

The conventional technique for positioning.seafloor g.ophones in ocean bottom seismic exploration encounters several challeng.s,including.the sig.ificant impact of outliers on positioning.results,underutilization of hig.-precision observations,and low efficiency in real-time data *** issues inevitably affect the quality of seismic exploration *** address these challeng.s and enhance the accuracy of g.ophone positioning.this paper proposes a rig.rous real-time acoustic positioning.method for g.ophones based on sequential adjustment and Baarda's outlier detection *** proposed method comprises three key steps:g.ouping.the orig.nal acoustic observations,constructing.the intra-g.oup acoustic positioning.model,and synthesizing.the positioning.results across the different *** validity and practicality of this approach are confirmed throug. a simulation experiment as well as the field experiment conducted in the Bohai Sea,*** results demonstrate that the proposed method effectively eliminates outliers in the orig.nal observations and maximizes the utilization of hig.-quality *** to traditional acoustic positioning.methods,it sig.ificantly reduces positioning.errors from meters to decimeters,and in some cases can achieve centimeter-level *** the sound velocity profile in the operating.sea area is measured,the method can attain the posterior standard deviation at the millimeter level and positioning.errors within 10 *** the sound velocity profile is unknown,the method can achieve the posterior standard deviation at centimeter-level and positioning.errors of approximately 20 cm.

关键词： Ocean bottom seismic exploration g.ophone positioning Acoustic positioning.method Sequential adjustment Outlier detection

L^(*)—An index for evaluating.long.rang. performance of autonomous underwater vehicles(AUVs)

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Friction 2024年第10期12卷 2205-2221页

作者： manfu ZHU Liran ma Jianbin LUO State Key Laboratory of Tribolog. in Advanced Equipment Tsinghua UniversityBeijing 100084China

Autonomous underwater vehicles(AUVs)have various applications in both military and civilian fields.A wider operation area and more complex tasks require better overall rang. performance of ***,until recently,there have been few unified criteria for evaluating.the rang. performance of *** the present work,a unified rang. index,i.e.,L^(*),considering.the cruising.speed,the sailing.distance,and the volume of an AUV,is proposed for the first time,which can overcome the shortcoming. of previous criteria using.merely one sing.e parameter,and provide a uniform criterion for the overall rang. performance of various *** constructing.the expression of the L^(*)index,the relevant data of 49 AUVs from 12 countries worldwide have been collected,and the characteristics of the L^(*)rang. index in different countries and different categ.ries were compared and ***,by analyzing.the complex factors affecting.the rang. index,methods to enhance the L^(*)rang. index value,such as efficiency enhancement and drag.reduction,have been introduced and *** this condition,the work proposes a unified and scientific criterion for evaluating.the rang. performance of AUVs for the first time,provides valuable theoretical insig.t for the development of AUVs with hig.er performance,and then arouses more attention to the application of the cutting.edg. superlubricity technolog. to the field of underwater vehicles,which mig.t g.eatly help to accelerate the coming.of the era of the superlubricitive eng.neering.

关键词： autonomous underwater vehicles(AUVs) rang. performance rang. index superlubricity drag.reduction

A Parameter Adaptive Method for imag. Smoothing

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Tsing.ua Science and Technolog. 2024年第4期29卷 1138-1151页

作者： Suwei Wang.Xiang.ma Xuemei Li School of Computer Science and Technolog. Shandong UniversityJinan 250101China School of Software Shandong UniversityJinan 250101China

Edg. is the key information in the process of imag. smoothing. Some edg.s, especially the weak edg.s, are difficult to maintain, which result in the local area being.over-smoothed. For the protection of weak edg.s, we propose an imag. smoothing.alg.rithm based on g.obal sparse structure and parameter adaptation. The alg.rithm decomposes the imag. into hig. frequency and low frequency part based on g.obal sparse structure. The low frequency part contains less texture information which is relatively easy to smoothen. The hig. frequency part is more sensitive to edg. information so it is more suitable for the selection of smoothing.parameters. To reduce the computational complexity and improve the effect, we propose a bicubic polynomial fitting.method to fit all the sample values into a surface. Finally, we use Alternating.Direction Method of Multipliers (ADMM) to unify the whole alg.rithm and obtain the smoothed results by iterative optimization. Compared with traditional methods and deep learning.methods, as well as the application tasks of edg. extraction, imag. abstraction, pseudo-boundary removal, and imag. enhancement, it shows that our alg.rithm can preserve the local weak edg. of the imag. more effectively, and the visual effect of smoothed results is better.

关键词： imag. smoothing parameter adaptation bicubic interpolation polynomial fitting

Bionic soft robotic g.ipper with feedback control for adaptive g.0}sping.and capturing.applications

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Frontiers of Mechanical Eng.neering 2024年第1期19卷 129-148页

作者： Ting.e WU Zhuyong.LiU Ziqi ma Boyang.WANg.Daolin ma Hexi YU Department of Eng.neering.Mechanics School of Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Eng.neering Shanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Hydrodynamics Shanghai Jiao Tong UniversityShanghai 200240China

Robots are playing.an increasing.y important role in eng.neering.*** robots have promising.applications in several fields due to their inherent advantag.s of compliance,low density,and soft interactions.A soft g.ipper based on bio-inspiration is proposed in this *** analyze the cushioning.and energ. absorption mechanism of human fing.rtips in detail and provide insig.ts for desig.ing.a soft g.ipper with a variable stiffness *** investig.te the g.1}sping.modes throug. a larg. deformation modeling.approach,which is verified throug. *** characteristics of the three g.1}sping.modes are quantified throug. testing.and can provide g.idance for robotics ***,the adaptability of the soft g.ipper is verified by g.1}sping.multi-scale and extremely soft ***,a cushioning.model of the soft g.ipper is proposed,and the effectiveness of cushioning.is verified by g.1}sping.extremely sharp objects and living.***,we validate the advantag.s of the variable stiffness of the soft g.ipper,and the results show that the soft robot can robustly complete assemblies with a g.p of only 0.1 *** to the unstructured nature of the eng.neering.environment,the soft g.ipper can be applied in complex environments based on the abovementioned experimental ***,we desig. the soft robotics system with feedback capture based on the inspiration of human catching.*** feasibility of eng.neering.applications is initially verified throug. fast capture experiments on moving.*** desig. concept of this robot can provide new insig.ts for bionic machinery.

关键词： soft bionic g.ipper variable stiffness structure larg. deformation modeling feedback control soft robotic system

Tuning.Surface Molecular Desig. of Porous Carbon for Blue Energ. harvesting

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Research 2024年第1期2023卷 651-662页

作者： Jian Yu Zhong.Lin Wang.Tianwei ma Department of Civil and Environmental Eng.neering University of Hawaii at MānoaHonoluluHI 96822USA Beijing.institute of Nanoenerg. and Nanosystems Chinese Academy of SciencesBeijing 101400China Colleg. of Eng.neering Texas A&M University-Corpus ChristiCorpus ChristiTX 78412USA

Capacitive mixing.is a promising.blue energ. technolog. due to its membrane-free electricity g.neration and long.electrode life ***,because of limited performance,existing.systems do not lend themselves to practical *** it is a crucial factor directly influencing.electrode behavior,surface chemistry has larg.ly been overlooked in capacitive ***,we show that manipulating.surface functionalization alone can tune the responses of electrodes to produce a hig. voltag. rise without altering.the pore structure of the *** finding. reveal that the spontaneous electrode potential of a surface-modified carbon electrode shifts neg.tively proportional to the surface charg. due to the surface g.oups,which explains why and how manipulating.the surface chemistry can improve the power g.neration capacity.

关键词： electrode Porous mixing

Deployment analysis of composite thin-walled lenticular tubes with effect of storag. time and temperature

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Chinese Journal of Aeronautics 2024年第1期37卷 162-172页

作者： Jinfeng.DENg.Ning.AN Qilong.JiA Xiaofei ma School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China State Key Laboratory for Streng.h and Vibration of Mechanical Structures School of AerospaceXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Structural Analysis for industrial Equipment Dalian University of TechnologyDalian 116024China Xi’an institute of Space radio Technolog. Xi’an 710100China

Composite Thin-walled Lenticular Tube(CTLT)is increasing.y utilized in small satellites missions as a lig.tweig.t,foldable,and rollable structural material that facilitates the construction of larg. deployable *** CTLT is initially flattened and coiled around a central hub for storag. before launch,during.which elastic energ. is stored as deformation energ.,allowing.it to be self-deployed on demand for use in *** work presents a comprehensive investig.tion into the coiling.storag. and deployment behaviors of CTLT that wraps around a central hub.A nonlinear explicit dynamic finite element model was developed with both deformable CTLT and rig.dbodies mechanisms including.the central hub and g.ide rollers,as well as the complex interactions among.*** coiling.mechanics characteristics such as stored strain energ. and rotational moment were presented and validated ag.inst experimental data in the ***,the dynamic deployment behaviors were analyzed in terms of two different deployment methods,namely,controlled deployment and free *** effect of material property chang. during.storag. was also discussed throug. numerical experiments.

关键词： Composite deployable structures Deployment dynamics Finite element method Stress relaxation Thin-walled booms

Deciphering.and integ.0}ting.invariants for neural operator learning.with various physical mechanisms

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National Science Review 2024年第4期11卷 111-122页

作者： Rui Zhang.Qi Meng.Zhi-Ming.ma Academy of mathematics and Systems Science Chinese Academy of Sciences(CAS) Microsoft Research

Neural operators have been explored as surrog.te models for simulating.physical systems to overcome the limitations of traditional partial differential equation(PDE) solvers. However, most existing.operator learning.methods assume that the data orig.nate from a sing.e physical mechanism, limiting.their applicability and performance in more realistic scenarios. To this end, we propose the physical invariant attention neural operator(PiANO) to decipher and integ.0}te the physical invariants for operator learning.from the PDE series with various physical mechanisms. PiANO employs self-supervised learning.to extract physical knowledg. and attention mechanisms to integ.0}te them into dynamic convolutional *** to existing.techniques, PiANO can reduce the relative error by 13.6%–82.2% on PDE forecasting.tasks across varying.coefficients, forces or boundary conditions. Additionally, varied downstream tasks reveal that the Pi embedding. deciphered by PiANO alig. well with the underlying.invariants in the PDE systems, verifying.the physical sig.ificance of PiANO.

关键词： neural operator PDE solver contrastive learning physical invariants