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| 1 | EXPONENTIAL STABILITY OF LINEAR DISTRIBUTED PARAMETER SWITCHED SYSTEMS WITH TIME-DELAY显示文摘In this paper, the exponential stability analysis for ODE switched systems with time delay is extended to distributed parameter switched systems(DPSS) in Hilbert space. For a given family of exponential stable subsystems, this paper focuses on finding conditions to guarantee the overall DPSS' exponential stability. Based on semigroup theory, by applying piecewise Lyapunov-Krasovskii functionals method incorporated average dwell time approach, sufficient conditions for exponential stability are derived. These conditions are given in the form of linear operator inequalities(LOIs)where the decision variables are operators in Hilbert space, and the stability properties depend on switching rule. Being applied to heat switched propagation equations, these LOIs are reduced to standard Linear Matrix Inequalities(LMIs). Finally, a numerical example is given to illustrate the effectiveness of the proposed result. | BAO Leping FEI Shumin YU Lei | 2014 | Journal of Systems Science & Complexity2014，27，2： | 9 |
| 2 | Composite Polymer Electrolyte Membranes based on Nafion and Modified PVDF Electrospun Nanofiber Mats显示文摘We fabricated the nanofiber composite membranes by impregnating Nafion into the modified polyvinylidene fluoride(PVDF) electrospinning nanofiber mat for proton exchange membrane fuel cells applications.The hydrophobic PVDF nanofibers mat became to the hydrophilic state by alkali treatment for the full embedding of Nafion into the PVDF network.The fabricated composite membranes exhibit significantly enhanced thermal stabilities,swelling resistance,and observably improved mechanical property compared to the pristine Nafion membrane.When the content of PVDF nanofiber mat is 15.1wt% in the membrane,the proton conductivity of the nanofiber composite membrane is nearly equal to that of pristine Nafion membrane with the same condition.The experimental results show that the prepared composite membrane can be used as a promising polyelectrolyte membrane for fuel cell applications. | 何贻宁 WANG Di 李琼 HUANG Leping BAO Haifeng | 2020 | Journal of Wuhan University of Technology(Materials Science)2020，35，4： | 0 |
| 3 | Control synthesis of linear distributed parameter switched systems显示文摘The control synthesis for switched systems is extended to distributed parameter switched systems in Hilbert space. Based on semigroup and operator theory, by means of multiple Lyapunov method incorporated average dwell time approach, sufficient conditions are derived in terms of linear operator inequalities framework for distributed parameter switched systems. Being applied to one dimensional heat propagation switched systems, these linear operator inequalities are reduced to linear matrix inequalities subsequently. In particular, the state feedback gain matrices and the switching law are designed, and the state decay estimate is explicitly given whose decay coefficient completely depends on the system's parameter and the boundary condition. Finally, two numerical examples are given to illustrate the proposed method. | Leping Bao Shumin Fei Lin Chai | 2015 | Journal of Systems Engineering and Electronics2015，26，3： | 0 |
| 4 | Exponential stability and L_(2) gain analysis of switched distributed parameter systems with time delay显示文摘The present paper is concerned with stability and L_(2) gain analysis of switched distributed parameter system(SDPS)with time delay.First,exponential stability is discussed,and the state decay estimate of the system is explicitly given by using linear matrix inequalities(LMIs)incorporating with the average dwell time(ADT)method.Second,L_(2) gain analysis is also studied.At last,illustrative examples are given to show the effectiveness of the proposed method.The main contribution of the paper is:some criteria of exponential stability and L_(2) gain for multiple-input multiple-output(MIMO)switched PDE are developed in the form of LMIs and ADT signal for the first time.The advantage of the work is we generalize the application range of the related research.The proposed method is expected to provide an effective tool for stability and H∞control analysis of SDPS. | Leping Bao Pu Huang Shumin Fei | 2021 | Journal of Control and Decision2021，8，4： | 0 |
| 5 | Polar plumes observed at the total solar eclipse in 2009显示文摘During the total solar eclipse of July 22, 2009, we carried out a white-light observation in Anji, Zhejiang, China. The aim wasto observe the polar plumes (PPs) with high spatial and temporal resolutions in white-light. With the observational data, weinvestigate the properties and evolution of the PPs and compare them with those of the low-latitude plumes (LPs). We find thatboth the PPs and the LPs have comparable lengths and widths, and the mean length and width are 300 Mm and 16 Mm, re-spectively. The average inclination angle (13 degree) of the PPs is smaller than that (32 degree) of the LPs. Generally, theplumes which are closer to the coronal hole center are more vertical. We trace the PPs and the LPs in the sequence of imagesand find that none of them disappears and no new one is created. Additionally, neither plasma outflow nor transverse oscilla-tion is observed. These imply that the evolution process of plumes is much longer than the timescale of eclipse. | YANG ShuHong ZHANG Jun ZHANG ZhiYong ZHAO ZhaoWang LIU YangBing SONG Qian YANG ShangBin BAO XingMing LI LePing CHU Zhe LI Ting | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，10： | 0 |
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