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Neural Regeneration Research 2025年第6期20卷 1715-1716页

作者： dan.ma Nona Pop Aston Medical School College of Health and Life SciencesAston UniversityBirminghamUK

Myelin is the protective sheath surrounding nerve fibers, and its damage(demyelination) occurs in many central nervous system(CNS) diseases, including multiple sclerosis(MS), traumatic injury, neurodegenerative diseases such as Alzheimer's disease, and mental disorders such as schizophrenia(Barateiro et al., 2016). Repair of damaged myelin sheaths(remyelination) often fails in MS, leading to neuronal loss and irreversible functional deficits.

关键词： myelin protective diseases

Design of two-layer switching rule for stabilization of switched linear systems with mismatched switching

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Control Theory and Technology 2014年第3期12卷 275-283页

作者： dan.ma State Key Laboratory of Synthetical Automation for Process Industries and College of Information Science and EngineeringNortheastern University

A two-layer switching architecture and a two-layer switching rule for stabilization of switched linear control systems are proposed, under which the mismatched switching between switched systems and their candidate hybrid controllers can be allowed. In the low layer, a state-dependent switching rule with a dwell time constraint to exponentially stabilize switched linear systems is given; in the high layer, supervisory conditions on the mismatched switching frequency and the mismatched switching ratio are presented, under which the closed-loop switched system is still exponentially stable in case of the candidate controller switches delay with respect to the subsystems. Different from the traditional switching rule, the two-layer switching architecture and switching rule have robustness, which in some extend permit mismatched switching between switched subsystems and their candidate controllers.

关键词： Two-layer switching rule Mismatched switching Switched linear systems

Adaptive Neural Network Control of Thermoacoustic Instability in Rijke Tube: A Fully Actuated System Approach

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Journal of Systems Science & Complexity 2022年第2期35卷 586-603页

作者： ZHAO Yuzhuo ma dan.ma Hongwei State Key Laboratory of Synthetical Automation for Process Industries and College of Information Science and Engineering Northeastern UniversityShenyang 110819China College of Information Science and Engineering Northeastern UniversityShenyang 110819China

Thermoacoustic instability phenomena often encounter in gas turbine combustors,especially for the premixed combustor design,with many possible detrimental *** a classical experiment,the Rijke tube is the simplest and the most effective illustration to study the thermoacoustic *** paper investigates the active control approach of the thermoacoustic instability in a horizontal Rijke ***’s more,the radial basis function(RBF)neural network is adopted to estimate the complex unknown continuous nonlinear heat release rate in the Rijke ***,based on the proposed second-order fully actuated system model,the authors present an adaptive neural network controller to guarantee the flow velocity fluctuation and pressure fluctuation to converge to a small region of the ***,simulation results demonstrate the feasibility of the design method.

关键词： Adaptive neural network control fully actuated system nonlinear system Rijke tube thermoacoustics instability

Real-valued valuations on Sobolev spaces

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Science China mathematics 2016年第5期59卷 921-934页

作者： ma dan Institut für Diskrete mathematik und Geometrie Technische Universitat Wien Wien 1040 Austria

Continuous, SL(n) and translation invariant real-valued valuations on Sobolev spaces are *** centro-affine Hadwiger's theorem is applied. In the homogeneous case, these valuations turn out to be L^p-norms raised to p-... 详细信息

关键词： Sobolev space valuation convex polytope

Reliability and Numerical Analysis of a Robot Safety System

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Journal of Systems Science & Complexity 2019年第4期32卷 1072-1092页

作者： QIAO Xing ma dan College of Automation Harbin Engineering UniversityHarbin 150001China School of mathematical Science Daqing Normal UniversityDaqing 163712China

This paper discusses a model for a repairable robot safety system composed of a safety component and two redundant robots according to a semi-group *** development of the model is divided into three phases:(Ⅰ)The use of pure analysis to prove the uniqueness of a classical solution to the model;(Ⅱ)The verification of this uniqueness by providing a non-negative solution to the model;and(Ⅲ)the formulation of reliability indices for the model,along with numerical examples to explain the *** existence,uniqueness,and exponential stability of the solution of the repairable robot safety system is studied using Volterra-type integral-differential-equation theory,and the spectral distribution of the ACP operator is ***,the authors propose a method to investigate the steady-state indicator of the robot safety system with the safety component working,and with or without the component revolving,to make use of the correspondence of the eigenvector to the eigenvalue *** authors show that the robot’s operation,with or without the safety component revolving and with fractional motion,is superior to that with the safety component *** novelty of the approach lies in its examination of a unique solution to the system and its exponential stability based on C0-semi-group theory,the co-final relative theory,and the functional analysis method.

关键词： Numerical analysis reliability index robot safety system stability

A design of T-foil and trim tab for fast catamaran based on NSGA-II

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Journal of Hydrodynamics 2020年第1期32卷 161-174页

作者： Qi-dan Zhu Yu ma Collge of Automation Harbin Engineering UniversityHarbin 150001China

This paper proposed an optimization design for a ride control system(RCS)for fast *** ship vertical motions are predicted by 2.5-D *** hydrodynamic characteristics of T-foil and trim tab are given,and the dynamic stability of the system is *** this basis,the ride control system optimization model in regular and irregular waves is established for a specific *** optimal solution is obtained by using non-dominated sorting genetic algorithm-II(NSGA-II).

关键词： Deep neural network channel flow turbulence model Reynolds stress

Circle formation control for multi-agent systems with a leader

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Control Theory and Technology 2015年第1期13卷 82-88页

作者： Lianjie ZHAO dan.ma College of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

In this paper, we focus on circle formation control of multi-agent systems （maS） with a leader. The circle formation is achieved based on the lead-following and the artificial potential field method. A distributed control law is given to make a group of agents form a circle and consequently achieve an expected angle. Finally, simulation results show that the proposed circle formation strategies are effective.

关键词： Circle formation artificial potential field method multi-agent systems distributed control

Immobilized Lentinus edodes residue as absorbent for the enhancement of cadmium adsorption performance

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Frontiers of Environmental Science & Engineering 2012年第4期6卷 498-508页

作者： Pei ma dan ZHANG Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China Institute of Mountain Hazards and Environment Chinese Academy of Sciences and Ministry of Water ConservancyChengdu 610041China

To investigate the potential use of Lentinus edodes （L. edodes） residue for Cd^2＋ adsorption, poly alcohol Na alginate （PVA） was applied to immobilize it. The parameters including contact time, pH, adsorbent dosages, and coexisting metal ions were studied. The suitable pH for immobilized L. edodes was 4-7 wider than that for raw L. edodes （pH 6-7）. In the presence of Pb^2＋ concentration varying from 0 to 30mg.L^-1, the Cd^2＋ adsorption ratios declined by 6.71% and 47.45% for immobilized and raw L. edodes, respectively. While, with the coexisting ion Cu2＋ concentration varied from 0 to 30 mg.L^-1, the Cd^2＋ adsorption ratios declined by 12.97% and 50.56% for immobilized and raw L. edodes, respectively. The Cd^2＋ adsorption isotherms in singlemetal and dual-metal solutions were analyzed by using Langmuir, Freuxldlich, and Dubinin-Radushkevich models. The Cd^2＋ adsorption capacities （qm） in single-metal solution were 6.448 mg.L^-1 and 2.832 mg.L^-1 for immobilized and raw L. edodes, respectively. The qm of immobilized L. edodes were 1.850 mg Cd. gl in Cd^2＋＋ Pb^2＋ solution and 3.961mg Cd.g^-1 in Cd^2＋＋ Cu^2＋ solution, respectively. The Cd^2＋ adsorption processes subjected to both adsorbents follow pseudo-second-order model. Mechanism study showed the functional group of L. edodes was -OH, -NH, -CO, and PVA played an important role in metal adsorbing. Mining wastewater treatment test showed that PVA-SA-immobilized L. edodes was effective in mixed pollutant treatment even for wastewater containing metal ions in very low concentration.

关键词： competitive immobilization Lentinus edodes residue adsorption isotherm

Plasma perturbations in the coexisting environment of VLF transmitter emission, lightning strokes and seismic activity

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Science China(Technological Sciences) 2018年第5期61卷 678-686页

作者： TAO dan LIU WenLong ma YuDuan School of Space and Environment Beihang University

We analyzed plasma perturbations occurring in the coexisting environment of powerful VLF transmitter emission, intense lightning strokes and strong seismic activity during pregnant period. The results suggest that anomalous electron bursts with energy dispersion in the range of ~100–350 keV, forming the "wisp" signature, are due to cyclotron resonance of electrons with monochromatic waves from the powerful NWC VLF transmitters during nighttime. The intense broad band VLF emissions (up-going 0+ whistlers) are observed while the DEMETER satellite goes through the region of intense thunderstorm activities at mid-latitudes. However, the effects of intense lightning activity and pregnant earthquake have little impact on this kind of stable energy-dispersed electron structures, despite the fact that they are presumably two primary reasons for the particle precipitation in the ionosphere. The case studied here provides us a valuable opportunity to address the various sources triggering the anomalous plasma perturbations in the ionosphere.

关键词： plasma perturbation electron precipitation cyclotron resonance VLF transmitter lightning seismic activity

Effect of Crystallization and Entropy Contribution Upon the Mechanical Response of Polymer Nano-fibers:A Steered Molecular Dynamics Study

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Chinese Journal of Polymer Science 2023年第3期41卷 465-474,I0011页

作者： Rui ma dan Xu Chuan-Fu Luo Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed matters College of Physical Science and TechnologyYili Normal UniversityYining 835000China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China School of Applied Chemistry and EngineeringHefei 230026China

The mechanical response of polyethylene nano-fibers with the same chain length but different chain numbers are studied by using steered molecular dynamics *** shrinking or stretching forces acted on the chain ends are investigated according to the chain-end distance and temperature under isothermal or continuous warming-cooling conditions,*** inflection point is found in the ForceDistance response when temperature is below 500 *** inflection point is related to the balance between entropy force and inter-monomer interaction and it reflects the strong effect of crystallization on the mechanical response of the *** force at inflection point is also affected by the buckling effect due to increased stiffness when crystallization *** two stages found in the Force-Temperature response and the difference between the shrinking and stretching forces indicate the hysteresis of crystallization and *** forces at different shrinking and stretching rates reveal the entropy contribution upon the mechanical response,indicated by the Ramachandran plot of *** chain-conformation entropy is majorly contributed by dihedrals and is quantified by the information entropy of dihedrals,which has a highly similarity to the mechanical Force-Temperature *** enlarged forces in multiple chains over a single chain are attributed to the enhanced dihedral-conformation *** study provides a new insight to the dynamically mechanical response of polymer nano-fibers according to the effect of crystallization and entropy contribution.

关键词： Polymer fibers Crystallization Entropy contribution Mechanical response