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BUCKLING ANALYSIS OF STRETCHABLE FERROELECTRIC THIN FILM ON ELASTOMERIC SUBSTRATES

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Acta Mechanica Solida Sinica 2014年第5期27卷 509-517页

作者： Zhidong Zhou quan jiang Department of Materials Science and Engineering College of MaterialsXiamen University College of Civil Engineering Nantong University

The thin stiff films on pre-stretched compliant substrates can form wrinkles, which can be controlled in micro and nanoscale systems to generate smart structures. Recently, buck- led piezoelectric/ferroelectrie nanoribbons have been reported to show an enhancement in the piezoelectric effect and stretchability, which can be applied in energy harvesting devices, sensors and memory devices instead of polymeric polyvinylidine fluoride （PVDF）. This paper studies the buckling and post-buckling process of ferroelectric thin films bonded to the pre-stretched soft layer, which in turn lies on a rigid support. Nonlinear electromechanical equations for the buckling of thin piezoelectric plates are deduced and employed to model the ferroelectric film poled in the thickness direction. Two buckling modes are analyzed and discussed： partially de-adhered buck- ling and fully adhered buckling. Transition from one buckling mode to the other is predicted and the effect of piezoelectricity on the critical buckling condition of piezoelectric film is examined.

关键词： buckling ferroelectric films energy method variational method

MRI and glymphatic system

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Stroke & Vascular Neurology 2019年第2期4卷 75-77页

作者： quan jiang Departments of Neurology Henry Ford HospitalDetroitMichiganUSA

Glymphatic system is newly discovered pseudolymphatic system in brain and it plays an important role in the removal of interstitial metabolic waste products. We discuss and review the role of glymphatic system in neurological diseases, especially focus on the potential of MRI modelling and its associated challenges to obtain useful new information related to understand the glymphatic system dynamics, pathways, and provide quantitative maps for diagnosis, monitoring and prognosis of the disease. The non-invasive nature of MRI might more readily help with translation of glymphatic measurements from the laboratory to the clinic.

关键词： lymphatic diagnosis diseases

Qualitative analysis for state/event fault trees using formal model checking

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Journal of Systems Engineering and Electronics 2019年第5期30卷 959-973页

作者： jiang quan ZHU Chunling WANG Siqi College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China China Academy of Electronics and Information Technology Beijing 100083China

A state/event fault tree(SEFT)is a modeling technique for describing the causal chains of events leading to failure in software-controlled complex *** systems are ubiquitous in all areas of everyday life,and safety and reliability analyses are increasingly required for these *** combine elements from the traditional fault tree with elements from state-based *** the context of the real-time safety-critical systems,SEFTs do not describe the time properties and important timedependent system behaviors that can lead to system ***,SEFTs lack the precise semantics required for formally modeling time *** this paper,we present a qualitative analysis method for SEFTs based on transformation from SEFT to timed automata(TA),and use the model checker UPPAAL to verify system requirements’*** combination of SEFT and TA is an important step towards an integrated design and verification process for real-time safety-critical ***,we present a case study of a powerboat autopilot system to confirm our method is viable and valid after achieving the verification goal step by step.

关键词： state/event fault tree (SEFT) timed automata (TA) model transformation safety analysis

Implementing 1 → M Economical Phase-Covariant Telecloning in Cavity QED

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Communications in Theoretical Physics 2011年第3期55卷 441-444页

作者： XUE Li jiang Nian-quan College of Physics and Electric Information Wenzhou University Wenzhou 325035 China

We propose an experimentally feasible scheme to implement the economical 1 → M phase-covariant telecloning based on cavity QED. By the resonant interaction of the atoms with cavity field of a high-Q cavity and the different coupling strength between atoms and cavity field, the scheme can generate quantum entanglement channel in one step. What is more, the operation time and steps do not increase with the increase of atoms.

关键词： cavity QED phase-covariant telecloning

Effect of electromechanical the properties of epitaxial boundary conditions on ferroelectric thin films

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Chinese Physics B 2011年第10期20卷 407-412页

作者： Zhou Zhi-Dong Zhang Chun-Zu jiang quan Department of Materials Science and Engineering College of Materials Xiamen University Xiamen 361005 China Department of Civil Engineering School of Architecture and Civil Engineering Xiamen University Xiamen 361005 China College of Civil Engineering Nantong University Nantong 226019 China

The effects of internal stresses and depolarization fields on the properties of epitaxial ferroelectric perovskite thin films are discussed by employing the dynamic Ginzbur~Landau equation （DCLE）. The numerical solution for BaTiO3 film shows that internal stress and the depolarization field have the most effects on ferroelectric properties such as polarization, Curie temperature and susceptibility. With the increase of the thickness of the film, the polarization of epitaxia] ferroelectric thin film is enhanced rapidly under high internal compressively stress. With the thickness exceeding the critical thickness for dislocation formation, the polarization increases slowly and even weakens due to relaxed internal stresses and a weak electrical boundary condition. This indicates that the effects of mechanical and electrical boundary conditions both diminish for ferroelectric thick films. Consequently, our thermodynamic method is a full scale model that can predict the properties of ferroelectric perovskite films in a wide range of film thickness.

关键词： ferroelectric film internal stresses thermodynamic equations polarizations

Thickness Effect on (La_(0.26)Bi_(0.74))_2Ti_4O_(11) Thin-Film Composition and Electrical Properties

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Chinese Physics Letters 2018年第2期35卷 66-70页

作者： Hui-Zhen Guo An-quan jiang State Key Laboratory of ASIC & System School of MicroelectronicsFudan University

Highly oriented（00l）（La_（0.26）Bi_（0.74））_2Ti_4O_（11 ）thin films are deposited on（100） SrTiO_（3 ）substrates using the pulsed laser deposition *** grains form a texture of bar-like arrays along Sr Ti O_3110directions for the film thickness above 350 nm,in contrast to spherical grains for the reduced film thickness below 220 nm.X-ray diffraction patterns show that the highly ordered bar-like grains are the ensemble of two lattice-matched monoclinic（La,Bi）_4Ti_3O_（12 ）and TiO_（2 ）components above a critical film ***,the phase decomposes into the random mixture of Bi_2Ti_2O_（7 ）and Bi_4Ti_3O_（4 ）spherical grains in thinner *** critical thickness can increase up to 440 nm as the films are deposited on LaNiO_3-buffered SrTiO_（3 ）*** electrical measurements show the dielectric enhancement of the multi-components,and comprehensive charge injection into interfacial traps between（La,Bi）_4Ti_3O_（12 ）and TiO_（2 ）components occurs under the application of a threshold voltage for the realization of high-charge storage.

关键词： Bi Ti Thin-Film Composition and Electrical Properties LNO La

Peripheral Ferroelectric Domain Switching and Polarization Fatigue in Nonvolatile Memory Elements of Continuous Pt/SrBi_(2)Ta_(2)O_(9)/Pt Thin-Film Capacitors

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Chinese Physics Letters 2011年第7期28卷 275-277页

作者： CHEN Min-Chuan jiang an-quan State Key Laboratory of ASIC&System Department of MicroelectronicsFudan UniversityShanghai 200433

We verify the domain sideway motion around the peripheral regions of the crossed capacitors of top and bottom electrode bars without electrode *** avoid the crosstalk problem between adjacent memory cells,the safe distance between adjacent elements of Pt/SrBi_(2)Ta_(2)O_(9)/Pt thin−film capacitors is estimated to be 0.156µ***,the fatigue of Pt/SrBi_(2)Ta_(2)O_(9)/Pt thin-film capacitors is independent of the individual memory size due to the absence of etching damage.

关键词： electrode volatile film

Correction to Hawking Radiation Characteristics of Stationary Demianski-Newman Black Hole

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Communications in Theoretical Physics 2006年第6期45卷 1026-1030页

作者： jiang Qing-quan YANG Shu-Zheng Institute of Theoretical Physics China West Normal University Nanchong 637002 China

The pure thermal spectrum in dragging coordinate system and the tunneling radiation characteristics across the event horizon for stationary Demianski-Newman black hole are researched. The result shows that the tunneling rate of the particle is relevant to Bekenstein-Hawking entropy, and the derived radiate spectrum is not strictly pure thermal, but is consistent with underlying unitary theory. Finally, we use the obtained results to reduce to stationary Kerr black hole and static Schwarzschild black hole, and lind that only when ignoring the spectrum at higher energies is the tunneling radiation spectrum consistent with Hawking pure thermal one.

关键词： Demianski-Newman black hole energy conservation angular momentum conservation tunneling rate Bekenstein-Hawking entropy

New Three-Mode Squeezing Operators Gained via Tripartite Entangled State Representation

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Communications in Theoretical Physics 2008年第1期49卷 225-228页

作者： jiang Nian-quan FAN Hong-Yi College of Physics and Electric Information Wenzhou University Wenzhou 325035 China Department of Material Science and Engineering University of Science and Technology of China Hefei 230026 China

We show that the Agarwal-Simon representation of single-mode squeezed states can be generalized to find new form of three-mode squeezed states. We use the tripartite entangled state representations ｜p, y, z） and ｜x... 详细信息

关键词： tripartite entangled state three-mode squeezing operator IWOP technique