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Primary Studies on Burnup Estimation of Irradiated Uranium by Dtermining 236U/238U in Contaminated Environmental Samples jiANG Xiao-yan,zhang ji-long,ZOU Wei,Chang Zhi-yuan

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Primary Studies on Burnup Estimation of Irradiated Uranium b...

Challenges and opportunities facing game theory and control: an interview with Tamer Ba?ar

作者： jiANG Xiao-yan zhang ji-long ZOU Wei Chang Zhi-yuan

U/U of the environmental sample can indicate the existence of uranium irradiation,and even can be uesd to estimate the burnup of nuclear spent fuel.A study on the burnup estimation of irradiated uranium which was mixed with natural uranium was carried out by measuring the U/U and U/U in the samples by using MC-ICP-MS. According to the equation(1) and(2),a programme for calculating the burnup of the irradiated

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来源： cnki会议评论

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National Science Review 2020年第7期7卷 1142-1146页

作者： ji-Feng zhang the Academy of Mathematics and Systems Science of the Chinese Academy of Sciences

The Control community has recently witnessed an almost exponentially growing interest in the application of game-theoretic concepts and tools in research on control, multi-agent systems, and networks. In an interview with NSR, Professor Tamer Ba?ar, a member of the US National Academy of Engineering, Swanlund Endowed Chair and CAS Professor of Electrical and Computer Engineering, and Director of the Center for Advanced Study at the University of Illinois at Urbana-Champaign in the USA, former president of both the IEEE Control

关键词： Game theory

Particle contamination, the disruption of electronic connectors in the signal transmission system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 361-369页

作者： zhang ji-gao Research Lab of Electric Contacts Beijing University of Posts ＆ Telecommunications Beijing 100876 China

Particle pollution in air, also sometimes known as fine dust contamination, may cause electric contact failure. Recent research further proved that the fine particle is becoming a major disruption of the electronic connectors in signal transmission system. This paper specifies the connector contact in mobile phone application. To study the contact failure of mobile phone, a series of inspections and analytical research methods are introduced. Special features that cause the contact failure are summarized. Particle accumulation is the main problem; organic material such as lactates from sweat of the human body may act as adhesives to stick the separate particles together and make them adhere on the contact surface; chemical properties of dust cause serious local corrosion. The corrosion products may trap the particles and firmly attach on the contact surface; micro motion frequently occurs at the contact interface. Hard particle can be embedded into the surface, and soft particle could be squeezed and inserted into the contact; silicon compounds in dust play the most important role in forming high resistance regions that lead to failure; deposition of particles depends on the amount of materials, static electricity attracting force and gravity force applied on the particles. Current dust test can hardly reflect the serious contact failure. It is difficult to simulate the complexity of contact failure caused by particle contamination. Thus alternative ways of simulation experiment and improvement of contact reliability are proposed.

关键词： Dust Particle contamination Micro motion Corrosion

Deployment of SMP Miura-ori sheet and its application:Aerodynamic drag and RCS reduction

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Chinese Journal of Aeronautics 2022年第8期35卷 121-131页

作者： ji zhang Changguo WANG Lamei zhang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China Department of Information Engineering Harbin Institute of TechnologyHarbin 150001China

Origami,such as Miura-ori,is the art of folding two-dimensional materials into complex,elaborate,and multifunctional three-dimensional *** this paper,SMP MO sheet are prepared,and the accuracy of deployable process is verified by *** folding and deployable process of SMP MO sheet is divided into 4 stages,and each stage is described in *** stiffness of smart deployable stage is characterized by an exponential decline at the beginning and a gradual decrease to 0,and this is similar to the theoretical shear equivalent modulus in the Y *** effects of various parameters on strain and stress are also *** purpose of studying these mechanical characteristics is to provide driving force reference in application;In terms of application,the flow field and electromagnetic characteristics of MO sheet in different directions are *** aerodynamic drag and RCS reduction of MO unit cell and graded MO sheet during the deployable process are *** the dihedral fold angle is about 45°,the RCS reduction and drag reduction characteristics of MO sheet are relatively optimal,which is most beneficial to morphing aircraft.

关键词： Aerodynamic characteristics Deployment Miura-Ori Morphing aircraft RCS reduction SMP sheet

LS-Based Parameter Estimation of DARMA Systems with Uniformly Quantized Observations

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Journal of Systems Science & Complexity 2022年第3期35卷 748-765页

作者： jiNG Lida zhang ji-Feng Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

This paper is concerned with the parameter estimation of deterministic autoregressive moving average(DARMA)systems with quantization *** estimation algorithms adopted here are the least squares(LS)and the forgetting factor LS,and the signal quantizer is of uniform,that is,with uniform quantization *** authors analyse the properties of the LS and the forgetting factor LS,and establish the boundedness of the estimation errors and a relationship of the estimation errors with the size of quantization error,which implies that the smaller the quantization error is,the smaller the estimation error is.A numerical example is given to demonstrate theorems.

关键词： Discrete-time linear time-invariant systems parameter estimation quantized output

Special Blocks of Finite Groups

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Acta Mathematica Sinica,English Series 2016年第1期32卷 115-123页

作者： ji Ping zhang Beijing International Center for Mathematical Research Lmam School of Mathematical SciencesPeking University

We first determine in this paper the structure of the generalized Fitting subgroup F＊（G） of the finite groups G all of whose defect groups （of blocks） are conjugate under the automorphism group Aut（G） to either a Sylow p-subgroup or a fixed p-subgroup of G. Then we prove that if a finite group L acts transitively on the set of its proper Sylow p-intersections, then either L/Op（L） has a T.I. Sylow p-subgroup or p = 2 and the normal closure of a Sylow 2-subgroup of L/O2（L） is 2-nilpotent with completely descripted structure. This solves a long-open problem. We also obtain some generalizations of the classic results by Isaacs and Passman on half-transitivity.

关键词： Finite groups representations blocks defect groups

Pressure-induced instability and its coupled aeroelasticity of inflated pillow

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Chinese Journal of Aeronautics 2022年第2期35卷 1-7页

作者： ji zhang Changguo WANG jiaming GUO jiawei zhang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Special Environments Harbin Institute of TechnologyHarbin 150080China b Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China

A floating air weapon system(such as airborne floating mines)plays an important role in modern air defense *** paper focuses on aeroelastic characteristics of airborne floating mine named inflated ***,the dynamic deployable process of the pillow and characteristics of the local instability of the edge are studied,and the evolution mechanism of wrinkles and kinks is ***,in the cruising stage,the fluid-structural-thermal coupling analysis is performed on the pillow,and the aeroelastic characteristics are ***,the shapepreserving effect of the inflated pillow during the“negative pressure”slow landing stage is *** is found that when the wind velocity is higher,the pillow has a collapsed instability(surface extrusion and contact),and when the wind velocity is lower,snap-through instability ***,for the collapsed instability,a carbon fiber skeleton is added to discrete the large global collapsed fold into small local folds,thus achieving shape-preserving effect of *** snapthrough instability,the critical internal pressure and different shape evolution under different wind velocity are *** the analysis of the mechanical mechanism and control of the structural morphological evolution,it provides theoretical guidance for the application of the curved shell structure in floating air weapon system.

关键词： Aeroelastic analysis Fluid-structural-thermal coupling analysis Inflated pillow Kink Pressure-induced instability Wrinkle

Cytotoxicity of Ti–6Al–4V–5Cu Alloy to MC3T3-E1 Cells

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 694-700页

作者： ji zhang Ling Ren Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang110016China

The aim of this work was to study the cytotoxicity of Ti–6 Al–4 V–5 Cu(TC4–Cu)alloy for dental applications and evaluate the cell viability of diff erent fabricated TC4–Cu alloys in contact with MC3 T3-E1 cells in ***–6 Al–4 V(TC4)alloy was used as a negative control to evaluate the cytotoxicity level of TC4–Cu alloy so as to provide basic support for the dental clinical *** group TC4 and experimental group TC4–Cu with diff erent fabrications were incubated in the cell culture *** absorbance value of mouse osteoblast MC3 T3-E1 cells was detected by CCK-8 assay after 1,3 and 7 days,*** relative proliferation rate of cells was calculated,and then the toxicity level was valued for each *** morphology on the surface was also studied by observing the cytoskeleton through F-actin filament *** experimental results showed that the absorbance values for the experimental and the negative control groups were not same at diff erent time *** with diff erent fabricated TC4–Cu alloys,the annealing-TC4–Cu alloy showed much better *** mouse osteoblast MC3 T3-E1 cells cultured with annealing-TC4–Cu,rolling-TC4–Cu and solution+aging-TC4–Cu have no toxic eff ects,and these alloys could promote the proliferation of mouse osteoblasts.

关键词： Cytotoxicity Ti–6Al–4V–5Cu alloy Fabrication Biocompatibility

Long-term effects of electrochemical realkalization on carbonated concrete

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 127-137页

作者： Peng ZHU ji zhang Wenjun QU College of Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures Shanghai 200092China

The long-term effects of electrochemical realkalization on carbonated reinforced concrete with a W/C ratio of 0.65 were *** out of 16 carbonated specimens had been subjected to realkalization seven years ago,and the alkalinity of the concrete,the electrochemical characters(corrosion current density and potential)of the specimens and the corrosion conditions of the steel bars were *** of different specimens and also at different time(4,10,13 months and 7 years after realkalization)were *** to the phenolphthalein and pH meter test,the alkalinity of the concrete had disappeared after seven *** on the potentiodynamic polarization test,various corrosion conditions had developed on the steel bars,which was verified by visual *** bars were in the depassivated state,and their corrosion current densities increased significantly after seven *** developed in some of the specimens,and the diverse compactness of concrete and excessive current of realkalization were considered to be possible *** effects of the realkalization treatment vanished after seven years.

关键词： realkalization concrete carbonation polarization curve corrosion