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Nonlinear analysis of photo-induced wrinkling of glassy twist nematic films on compliant substrates

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Acta Mechanica Sinica 2015年第5期31卷 672-678页

作者： dong yang Ling-Hui He CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China

A kinetics approach is developed for the geometrically nonlinear analysis of photo-induced wrinkling of glassy twist nematic films on soft elastic *** this way,the problem is reduced to finding the steady state of an overdamped evolution system according to a kinetic law,rather than directly solving the coupled nonlinear *** enables one to account for the complicated director distribution and obtain the precise wrinkling morphology of the *** the approach proposed here is for a twist nematic film,it can be extended to study glassy nematic films with other director distributions.

关键词： Glassy nematic film Wrinkling pattern Nonlinear analysis

Bumpless transfer fault detection for switched systems: a state-dependent switching approach

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Science China(Information Sciences) 2021年第7期64卷 117-131页

作者： Guangdeng ZONG Chunxiao HUANG dong yang School of Engineering Qufu Normal University

This paper focuses on the bumpless transfer fault detection problem for switched systems under state-dependent switching. The goal is to find an effective constraint on filters and an appropriate switching signal to reduce the bumps of residual signals caused by switching while achieving expected fault sensitivity and robustness of the filtering systems. For transient behavior description, a novel bumpless transfer constraint is proposed to limit the amplitude of residual signals into a bounded range at the switching points. In terms of multiple Lyapunov functions, a state-dependent switching law is designed to realize fault detection performance even if the robustness and fault sensitivity of each subsystem are local. Sufficient conditions for the bumpless transfer fault detection problem are provided in the form of linear matrix inequalities. Finally,a numerical example is given to validate the effectiveness of the developed method.

关键词： bumpless transfer fault detection multiple Lyapunov functions state-dependent switching law switched systems

Comparison on End-of-Life strategies of WEEE in China based on LCA

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Frontiers of Environmental Science & Engineering 2017年第5期11卷 85-96页

作者： Bin Lu Xiaolong Song Jianxin yang dong yang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Shanghai Collaborative Innovation Centre tbr WEEE Recycling Shanghai Polytechnic University Shanghai 201209 China SDAS Key Laboratory of Scientific Decision-Making Institute of Science and Technology for Develooment of Shandong Shandong Province Academy of Sciences Jinan 250014 China

As the Electrical and Electronic Equipment （EEE） are upgraded more frequently in China, a large quantity of Waste Electrical and Electronic Equipment （WEEE） was and will be generated. It becomes an urgent issue to develop and adopt an effective End-of-Life （EoL） strategy for EEE in order to balance the resource recovery and environmental impacts. In an EoL strategy hierarchy for EEE, reuse strategy is usually deemed to be prior to materials recovery and other strategies. But in practice, the advantages and disadvantages of different strategies are always context-dependent. Therefore, main EoL strategies for EEE in China need to be evaluated in environment and resources aspects from the life cycle perspective. In this study, the obsolete refrigerator and Power Supply Unit （PSU） ofdesktop PC are both taken as the target products. Life Cycle Assessment （LCA） is applied to assess the environmental impacts of different EoL scenarios in China： Unit Reuse Scenario （URS）, Component Reuse Scenario （CRS） and Materials Recovery Scenario （MRS）. The LCA results show that the EoL strategies hierarchy is reasonable for the part＇of computer, bui not necessarily suitable for obsolete refrigerators. When the policy makers promote or demote one EoL strategy especially reuse, it is necessary to take subsequent impacts into consideration.

关键词： End-of-Life Waste Electrical and Electronic Equipment Life Cycle Assessment Reuse

The calculation of the circulation in South China Sea by a diagnostic model

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Acta Oceanologica Sinica 2008年第Z1期27卷 31-45页

作者： ZHOU Weidong yang yang dong Danpeng South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China

A high resolved two-dimensional linear global diagnostic model combining with the dynamical calculation is used to calculate velocity field in the South China Sea(SCS). The study of model results shows that eddy diffusion does not change basic structure of circulation in the SCS and does not change the direction of invasive water, but changes the value of transport considerably especially in straits. The velocity field is not changed whether the wind stress is considered or not. This result shows the circulation is largely determined by a density field which well records most of the important contribution of the wind stress effect. Potential vorticity is calculated to testify the dynamics of the model results. The result shows that a good conservation of the nonlinear PV. This indicates most effects of the important nonlinear processes are well recorded in density and the nonlinear term is negligible so that the simplified model is reliable. The model results show the water exchanges between the SCS and open ocean or surrounding seas. Cold deep water invades through Luzon Strait and Warm shallow water is pushed out mainly through Karimata Straits. The model results also reveal the structure of the circulation in the SCS basin. In two circulations of upper and middle layers, a cyclonic one in the north and an anti-cyclonic one in the south, reflect the climatologic average of the circulation driven by monsoon. In the deep or bottom layer, these two circulations reflect the topography of the basin. Above the middle layer, invasive water enters westward in the north but the way of invasion of Kuroshio is not clear. Below the deep layer, a current goes down south near the east basin ,and invasive water enters in the basin from the west Pacific.

关键词： diagnostic model South China Sea potential vorticity circulation

Interference cancellation method based on space-time code for MIMO interference channel

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The Journal of China Universities of Posts and Telecommunications 2016年第3期23卷 45-50页

作者： yang dong Tian Xinji Opening Project of Key Laboratory of Mine Informatization Henan Polytechnic University School of Computer Science and Technology Henan Polytechnic University

We investigate how to cancel interference by using space time code and codeword space alignment for multiple-input multiple-output （MIMO） Y channel consisting of three users and a relay. All the nodes adopt Alamouti code. During the multiple access （MA） stage, two codewords within each reciprocal codeword pair are aligned through pre-coding. The relay decodes the elements of each codeword pair using the orthogonal property of effective channel matrix of Alamouti codeword. During the broadcast （BC） stage, the interference between codeword pairs at each user is eliminated by the orthogonal property of effective channel matrix of Alamouti codeword, instead of the interference alignment （IA） pre-coding. Thus, channel state information （CSI） is not required during the BC stage, which greatly reduce the amount of feedback.

关键词： MIMO Y channel space-time code space alignment feedback amount

Thermal-Hydraulic Calculation and Analysis on Evaporator System of a 1000 MW Ultra-Supercritical Pulverized Combustion Boiler with Double Reheat

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Journal of Thermal Science 2021年第3期30卷 807-816页

作者： WAN Li yang dong ZHOU Xihong dong Le LI Juan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

A double reheat ultra-supercritical boiler is an important development direction for high-parameter and large-capacity coal-fired power plants due to its high thermal efficiency and environmental *** has developed a 1000 MW double reheat ultra-supercritical boiler with steam parameters of 35 MPa at 605℃/613℃/613℃.Reasonable water wall design is one of the keys to safe and reliable operation of the *** order to examine the thermal-hydraulic characteristics of the double reheat ultra-supercritical boiler,the water wall system was equivalent to a flow network comprising series-parallel circuits,linking circuits and pressure nodes,and a calculation model was built on account of the conservation equations of energy,momentum and *** the iterative solving of nonlinear equations,the prediction parameters of the water wall at boiler maximum continue rate(BMCR),75%turbine heat-acceptance rate(THA)and 30%THA loads,including total pressure drops,flow distribution,outlet steam temperatures,fluid and metal temperatures were *** results of calculation exhibit excellent thermal-hydraulic characteristics and substantiate the feasibility of the water wall design of the double reheat ultra-supercritical boiler.

关键词： double reheat ultra-supercritical boiler water wall flow network method thermal-hydraulic characteristic

ON NODAL LINE OF THE SECOND EIGENFUNCTION OF THE LAPLACIAN OVER CONCAVE DOMAINS IN R^2

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Journal of Systems Science & Complexity 2013年第3期26卷 483-488页

作者： yang dong-Hui Guo Bao-Zhu Department of Mathematics Central South University Academy of Mathematics and Systems Science Academia Sinica

In this note,the Payne's conjecture from convex domains to concave domains is *** is shown that the nodal line N of the second eigenfunction of the Laplacian over some simply connected concave domain Ω in R^2 must in... 详细信息

关键词： Eigenfunction eigenvalue Laplacian.

A NONCONFORMING ANISOTROPIC FINITE ELEMENT APPROXIMATION WITH MOVING GRIDS FOR STOKES PROBLEM

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Journal of Computational Mathematics 2006年第5期24卷 561-578页

作者： dong-yang Shi Yi-ran Zhang Department of Mathematics Zhengzhou University Zhengzhou 450052 China School of Mathematical Science Peking University Beijing 100871 China

This paper is devoted to the five parameters nonconforming finite element schemes with moving grids for velocity-pressure mixed formulations of the nonstationary Stokes problem in 2-D. We show that this element has anisotropic behavior and derive anisotropic error estimations in some certain norms of the velocity and the pressure based on some novel techniques. Especially through careful analysis we get an interesting result on consistency error estimation, which has never been seen for mixed finite element methods in the previously literatures.

关键词： Stokes problem Nonconforming finite element Anisotropy Moving grids Error estimate.

Roles of Plant Hormones and Their Interplay in Rice Immunity

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Molecular Plant 2013年第3期6卷 675-685页

作者： dong-Lei yang Yinong yang Zuhua He The Institute of Plant Physiology and Ecology Shanghai Institute for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China Shanghai Center for Plant Stress Biology Shanghai Institute for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China Department of Plant Pathology and Environmental Microbiology and Huck Institutes of Life Sciences Pennsylvania State University PA 16802 USA

ABSTRACT Plant hormones have been extensively studied for their importance in innate immunity particularly in the dicotyledonous model plant Arabidopsis thaliana. However, only in the last decade, plant hormones were demonstrated to play conserved and divergent roles in fine-tuning immune responses in rice （Oryza sativa L.）, a monocotyledonous model crop plant. Emerging evidence showed that salicylic acid （SA） plays a role in rice basal defense but is differentially required by rice pattern recognition receptor （PRR） and resistance （R） protein-mediated immunity, and its function is likely dependent on the signaling pathway rather than the change of endogenous levels. Jasmonate （JA） plays an important role in rice basal defense against bacterial and fungal infection and may be involved in the SA-mediated resistance. Ethylene （ET） can act as a positive or negative modulator of disease resistance, depending on the pathogen type and environmental conditions. Brassinosteroid （BR） signaling and abscisic acid （ABA） either promote or defend against infection of pathogens with distinct infection/colonization strategies. Auxin and gibberellin （GA） are generally thought of as negative regulators of innate immunity in rice. Moreover, GA interacts antagonistically with JA signaling in rice development and immunity through the DELLA protein as a master regulator of the two hormone pathways. In this review, we summarize the roles of plant hormones in rice immunity and discuss their interplay/crosstalk mechanisms and the complex regulatory network of plant hormone pathways in fine-tuning rice immunity and growth.

关键词： hormone biology defense responses plant-microbe interactions rice