A5100683545- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Dielectric properties of ceramics
- Software-Defined Networks and 5G
- Cloud Computing and Resource Management
- Network Security and Intrusion Detection
- Multiferroics and related materials
- Photonic and Optical Devices
- Software System Performance and Reliability
- Acoustic Wave Resonator Technologies
- Plasmonic and Surface Plasmon Research
- Internet Traffic Analysis and Secure E-voting
- Photonic Crystals and Applications
- Dielectric materials and actuators
- Security and Verification in Computing
- Pesticide Residue Analysis and Safety
- Scientific Computing and Data Management
- Electronic and Structural Properties of Oxides
- Advanced Malware Detection Techniques
- Distributed and Parallel Computing Systems
- Meromorphic and Entire Functions
- Advanced Data Storage Technologies
- Metamaterials and Metasurfaces Applications
- Neural Networks and Reservoir Computing
- Optical Network Technologies
Hohai University
2020-2025
Fudan University
2015-2024
ShanghaiTech University
2022-2024
Shanghai Jiao Tong University
2023-2024
The First Affiliated Hospital, Sun Yat-sen University
2018-2024
Zhongshan Hospital
2018-2024
Sun Yat-sen University
2018-2024
University of Michigan
2024
Jiangsu University
2024
China Railway Eryuan Engineering Group Co.
2023
The temperature dependence of dielectric properties and electrical conduction $({\mathrm{Sr}}_{1\ensuremath{-}1.5x}{\mathrm{Bi}}_{x}){\mathrm{TiO}}_{3} (0.0133<~x<~0.133)$ was measured from 10 to 800 K. Three sets oxygen vacancies related peaks (peaks A, B, $C)$ were observed. These could be greatly suppressed or eliminated by annealing the samples in an oxidizing atmosphere, enhanced recreated a reducing atmosphere. results show that Maxwell-Wagner polarization is not main mechanism,...
The polarization and strain behavior of Ba(Ti1−xZrx)O3 (x=0–0.3) ceramics are studied. unipolar levels ∼0.18% at 40 kV/cm ∼0.25% ∼120 with small hysteresis were obtained for the 0.03⩽x⩽0.08. remnant is ∼13–18 μC/cm2 0.03⩽x⩽0.08 below 2 0.15⩽x⩽0.3 room temperature. electromechanical coupling coefficient K33=56.5% piezoelectric stain d33=236 pC/N x=0.05. These results indicated that system a promising lead-free high material applications.
Miniaturized spectrometers have significant potential for portable applications such as consumer electronics, health care, and manufacturing. These demand low cost high spectral resolution, are best enabled by single-shot free-space-coupled that also sufficient spatial resolution. Here, we demonstrate an on-chip spectrometer can satisfy all of these requirements. Our device uses arrays photodetectors, each which has a unique responsivity with rich features. responsivities created complex...
Non-iridescent structural colors of high color visibility are produced by amorphous photonic structures, in which -natural cuttlefish ink is used as an additive to break down the long-range order structures. The hue and its spectral purity can be tuned adjusting diameter polystyrene (PS) spheres proportion particles.
The vortex, a fundamental topological excitation featuring the in-plane winding of vector field, is important in various areas such as fluid dynamics, liquid crystals, and superconductors. Although commonly existing nature, vortices were observed exclusively real space. Here, we experimentally momentum-space far-field polarization vectors first Brillouin zone periodic plasmonic structures. Using homemade polarization-resolved imaging spectroscopy, mapped out dispersion, lifetime, all...
Distributed Denial-of-Service (DDoS) attacks have become a critical threat to the Internet.Due increasing number of vulnerable Internet Things (IoT) devices, attackers can easily compromise large set nodes and launch highvolume DDoS from botnets.State-of-the-art defenses, however, not caught up with fast development attacks.Middlebox-based defenses achieve high performance specialized hardware; these incur cost, deploying new typically requires device upgrade.On other hand, software-based...
Dense ceramic composites consisting of two phases, ferroelectric BaTiO3 and ferrite (Ni0.3Zn0.7)Fe2.1O4, were synthesized via the solid state reaction route. The results indicate that insulating can be well compatible to conductive phase (Ni0.3Zn0.7)Fe2.1O4. electrical conduction dielectric behavior materials vary with ratio phases. is greatly influenced by phase. At x=0.3, a very high apparent constant peak frequency dispersion was observed, attributed Maxwell–Wagner polarization....
Ferroelectric-relaxor behavior of Ba(Ti0.7Zr0.3)O3 ceramics is studied in the temperature range from 150 to 450 K. A broad dielectric peak with a high-dielectric maximum exhibits frequency dispersion. The relaxation rate follows Vogel–Fulcher relation E=0.21 eV and TVF=199.6 polarization hysteresis loops were observed remnant 10 μC/cm2 at 175 constant high-polarization properties are expected find practical applications low temperatures.
The dc electric-field dependence of the relative dielectric constant ${\ensuremath{\varepsilon}}_{r}(E)$ in polar dielectrics is studied. Landau-Ginzburg-Devonshire (LGD) theory and its approximate treatments dealing with are reviewed. It found that LGD works well case a single polarization mechanism existing dielectrics, Johnson relation...
We show optical waves passing through a nanophotonic medium can perform artificial neural computing. Complex information is encoded in the wavefront of an input light. The transforms to realize sophisticated computing tasks such as image recognition. At output, energy concentrated well-defined locations, which, for example, be interpreted identity object image. These media small tens wavelengths and offer ultra-high density. They exploit subwavelength scatterers complex input/output mapping...
The molecular structure has an important effect on the surface and interfacial properties of sulfobetaine surfactant at both air–water crude oil–water interfaces.
Abstract Metalenses have emerged as a new optical element or system in recent years, showing superior performance and abundant applications. However, the phase distribution of metalens has not been measured directly up to now, hindering further quantitative evaluation its performance. We developed an interferometric imaging measurement measure by taking only one photo interference pattern. Based on distribution, we analyse negative chromatic aberration effect monochromatic metalenses propose...
To explore an innovative approach for enhancing the vibration isolation performance of vehicle air suspension systems, this study introduces inerter element into and investigates dynamic behavior semi-active ISD (inerter-spring-damper) suspension. Initially, a model quarter is established, followed by conducting multi-objective optimization core parameters using genetic algorithm. Subsequently, thoroughly examined through simulations analyses in both time frequency domains. The results...
The effect of dc electric field (E) on the dielectric properties Ba(Ti0.7Zr0.3)O3 ceramics with an obvious ferroelectric-relaxor behavior (Tm∼229 K, 10 kHz) is reported. constant greatly suppressed and a low loss obtained under fields (⩽40 kV/cm). (tan δ∼0.002) high tunability (∼45%) were for around 300 indicating that it promising candidate tunable materials at room temperature. dependence temperature (Tm) maximum follows ΔTm∼E2/3 relation, second-order phase-transition-like behavior.
Quantum ferroelectric and relaxor behavior has been found in $({\mathrm{Sr}}_{1\ensuremath{-}1.5x}{\mathrm{Bi}}_{x}){\mathrm{TiO}}_{3}.$ For $x<~0.0267,$ the quantum relationship ${T}_{{\ensuremath{\varepsilon}}_{m}}\ensuremath{\propto}(x\ensuremath{-}{x}_{c}{)}^{1/2}$ holds with ${x}_{c}\ensuremath{\approx}0.0005,$ obvious hysteresis loops were observed. The polarization relaxation shows critical slowing down. At high Bi concentration, a crossover from to occurred. coexistence of...
A high electrostrictive strain (∼0.1%) with hysteresis-free behavior is observed in (Sr,Na,Bi)TiO3 solid solutions. Its versus polarization (P) completely follows the quadratic relation (see Figure), indicating a purely effect an coefficient Q11 of 0.02 m4 C–2. These properties this environmentally friendly lead-free material are comparable those currently used lead-containing materials.
In this article, we report the evolution of dielectric behavior from a relaxor to ferroelectric with variation Bi concentration in (Sr1−1.5xBix)TiO3 (0⩽x⩽0.2). doping range 0.0005⩽x⩽0.002, two modes A and B are induced. The temperature (Tm) where permittivity maximum occurs for is independent dc electric fields. complex follows empirical Cole–Cole equation. relaxation time Arrhenius law. possessing type named as “dielectric relaxor.” At x⩾0.0033, an additional mode C appears, whose Tm...
We report that ``ferroelectric relaxor'' behavior is induced by doping Bi in quantum paraelectric ${\mathrm{SrTiO}}_{3},$ and Ce typical ferroelectric ${\mathrm{BaTiO}}_{3}.$ The present results show the state may exist no matter whether matrix or paraelectric, however, relaxor dynamic response of polar clusters system.
Content distribution systems have traditionally adopted one of two architectures: infrastructure-based content delivery networks (CDNs), in which clients download from dedicated, centrally managed servers, and peer-to-peer CDNs, each other. The advantages disadvantages architecture been studied great detail. Recently, hybrid, or 'peer-assisted', CDNs emerged, combine elements both architectures. properties such systems, however, are not as well understood.
In this work, X‐ray diffractometry and scanning electron microscopy techniques were used to study the incorporation of yttrium in BaTiO 3 , with following nominal compositions: (Ba 1‐ x Y )TiO (0.015 ≤ 0.08), )Ti /4 ‐(□ Ti ) O (0.005 0.1), Ba(Ti y )O 3‐delta (0.028 0.258). The phase assemblage lattice parameters indicated a slight solubility (∼1.5 at.%) at Ba sites 1440°C but high (∼12.2 1515°C. When was heavily doped (a concentration ( <0.059), crystallographic structure tetragonal,...
The dielectric behaviour of Ba(Ti1−yCey)O3 solid solutions (y = 0–0.3) has been studied. A small amount Ce doping 0.02) weak influence on the Ba(Ti1−yCey)O3. With increasing concentration, three phase transitions pure BaTiO3 are pinched into one rounded peak with frequency dispersion, and relaxation time follows Vogel–Fulcher relation. evolution from a normal ferroelectric to relaxor is emphasized. High strains (S ∼ 0.1–0.19%) hysteresis under ac fields obtained in relaxors physical...