A5100601242- Thermal Radiation and Cooling Technologies
- Metamaterials and Metasurfaces Applications
- Concrete Corrosion and Durability
- Structural Behavior of Reinforced Concrete
- Corrosion Behavior and Inhibition
- Acoustic Wave Phenomena Research
- Thermoelastic and Magnetoelastic Phenomena
- Infrastructure Maintenance and Monitoring
- Thermal properties of materials
- Concrete and Cement Materials Research
- Nuclear Physics and Applications
- Thermography and Photoacoustic Techniques
- Urban Heat Island Mitigation
- Particle Accelerators and Free-Electron Lasers
- Advanced Materials and Mechanics
- Crystallography and Radiation Phenomena
- Tailings Management and Properties
- Topology Optimization in Engineering
- Phase-change materials and chalcogenides
- Random lasers and scattering media
- Cellular and Composite Structures
- Minerals Flotation and Separation Techniques
- Nanomaterials and Printing Technologies
- Conducting polymers and applications
- Graphene research and applications
State Key Laboratory of Surface Physics
2018-2024
Fudan University
2017-2024
Henan Academy of Sciences
2024
CCCC Wuhan Harbour Engineering Design and Research (China)
2023
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
2023
Shanghai Harbour Engineering Design & Research Institute
2023
Hunan University of Humanities, Science and Technology
2023
Xi'an University of Architecture and Technology
2020
University of Jinan
2014-2019
Collaborative Innovation Center of Advanced Microstructures
2017
Abstract Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified ≳10 yr ago. Since then, nearly 40 events have been discovered, although almost all these recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys follow-up searches not revealed any multiwavelength counterparts. The Einstein Probe, launched in 2024 January, has started surveying the regime (0.5–4 keV) will rapidly increase sample FXTs discovered real time. Here we report...
Thermal metamaterials usually rely on the asymmetric interaction between embedded particles and surrounding matrix. This study instead propose tailoring symmetric arranged in periodic lattices. Consequentially, thermal transparency is also realized. The authors find that Maxwell-Garnett Bruggeman formulas can explain systems with large area fractions of particles, they depend each other. work provides an avenue to exploration interparticle interactions, either reduce stress concentration or...
Architected structures have aroused widespread research interest because they possess unique properties in mechanics. However, a fundamental theory describing their thermal has not been established. Here, we present theoretical framework thermotics to predict of architected structures. Then, by experiment and simulation, show its applications the field heat management. By assembling two radically different materials, design types Janus The rotation degrees can flexibly control switch between...
Thermal metamaterials have been applied to implement thermal phenomena, such as invisibility, illusion, and refraction. However, during the fabrication, they probably complicated issues which are on account of structures. To get around this, here we put forward a single-particle structure. The theory helps simplify existing methods, will undoubtedly contribute efficiency fabrication. For clarity, show simulation experimental results invisibility illusion based our proposed structural...
Corrosion damage is one of the main problems affecting durability concrete structures. Several corroded reinforced (RC) railway bridges are located in regions high seismic risk. Corroded bridge piers often subjected to dynamic axial loads, such as vertical pounding that occurs during earthquakes or due trains. Repeated loading was used simulate this effect. Therefore, performance RC structures under repeated and horizontal cyclic an urgent issue. To investigate influences steel corrosion on...
All-purpose (or adaptive) materials are of great significance for practical applications. However, typical have fixed inherent properties, and hence cannot adapt to environmental changes. This study designs fabricates a class passive metamaterial shells that exhibit adaptive thermal responses changes in their surroundings---chameleonlike behavior, other words, $e.g.$ cloaking objects against radiant heat,. Such chameleonlike metashells will an impact because they can meet different...
Transparency and cloaking are two typical functions of thermal metamaterials that have attracted intensive research interest. However, restrictions remain to be solved. The first one is existing studies considered only or modes heat transfer, which may not consistent with practical conditions because conduction, radiation, convection often coexist. second transparency cannot switched between at will. To solve these problems, we propose an effective medium theory handle conductive, radiative,...
We introduce the phenomenon of golden touch from myth to thermotics. define as extending core property a shell with an extremely small fraction. obtain requirement by making effective thermal conductivity core-shell structure equal core. summarize three types (A, B, and C) in two dimensions, only (A B) dimensions. theoretically analyze distinct properties different delicately designing anisotropic shell. Golden is also validated finite-element simulations which echo theoretical analyses. has...
Thermal management has made considerable progress in the past decade for emerging field of thermal metamaterials. However, two severe problems still handicap development That is, conductivities should be singular and uncommon as required by corresponding theories. To solve these problems, here we establish theory dipole-assisted thermotics. By tailoring dipole moment, invisibility can achieved without requirements conductivities. Furthermore, finite-element simulations laboratory experiments...
Thermal metamaterials based on core-shell structures have aroused wide research interest, e.g., in thermal cloaks. However, almost all the relevant studies only discuss linear materials whose conductivities are temperature-independent constants. Nonlinear (whose depend temperatures) seldom been touched; however, they important practical applications. This situation largely results from lack of a general theoretical framework for handling such nonlinear problems. Here we study responses with...
Thermal conductivities are the key to heat transfer, and high thermal generally beneficial sometimes indispensable design metadevices. Therefore, exploration of never stops. However, infinite have not yet been discovered. To solve problem, we propose an exact approach effectively with a constant-temperature boundary condition, which can be easily realized by external thermostatic sink. Since (effectively) just correspond zero refractive indexes in photonics, they direct applications...
Nonlinear metamaterials have great potential in heat management, which has aroused intensive research interest both theory and application, especially for their response to surroundings. However, most existing works focus on geometrically isotropic (circular) structures, limiting the versatile functionalities. On other hand, anisotropy architecture promisingly offers an additional degree of freedom modulating directional transfer. Here, we investigate nonlinear composition effects...
Pull-out tests were conducted to investigate the effects of corrosion both longitudinal bars and stirrups on bond slip behaviour reinforced concrete specimens. The main experimental variables include strength (26.7 MPa, 37.7 MPa 45.2 MPa) expected loss (0%, 4%, 8% 12%), with a total 63 specimens fabricated. results show that relative bonding under different strengths gradually decreases increasing loss, but higher is, faster its degradation rate. influence stirrup peak can be ignored, it...
Thermal metamaterials have aroused broad research interests for their potential applications in heat manipulation. Among them, bilayer thermal cloak is a representative one. However, the requirement of zero conductivity inner layer may largely restrict broader applications. In this work, we remove and explore ternary component structure. By calculating its effective conductivity, derive some special relations which result two distinct camouflage behaviors, i.e., magnifier external cloak....
The effects of both steel corrosion and repeated loading on performance reinforced concrete beam were investigated. Repeated loads applied to corroded specimens with levels ranging from 0% 5%. experiments conducted for the deflection, cracking, stiffness, bearing capacity failure type beams. For less than 5%, residual deflection was about 3% maximum value deflection. beams high generally greater those low levels, while flexural rigidity decreased more in levels. modes changed plastic brittle...
Iron oxide was added to phosphoaluminate clinker and its effects on cement constituents were determined using XRD, DSC, SEM-EDS conduction calorimetry analysis. The variations in compressive strength also studied. results showed that moderate amounts, iron acts as a mineraliser during sintering, furthering the conversion of CA1-Y(PY) LHss at lower temperature than normally required for reaction. main oxide-rich included LHss, CA1-Y(PY), CP1-Z(AZ) ferrite. EDS findings composition ferrite...
It is a challenge to design intelligent thermal metamaterials due the lack of suitable theories. Here we propose kind by investigating core-shell structure, where both core and shell have an anisotropic conductivity. We solve Laplace's equation for deriving equivalent conductivity structure. Amazingly, solution gives two coupling relations tensors between shell, which cause whole structure counterintuitively self-fix constant isotropic even when area or volume fraction changes within full...
Intelligence has become one of the developing trends thermal metamaterials in order to meet different practical requirements. By considering temperature-dependent and specially designed conductivities, chameleonlike behaviors have been revealed realize adaptive responses nearby objects. However, existing schemes are approximately valid only for a small working range conductivities. This fact limits applications. To solve this problem, here we propose two exact behaviors, say, monolayer...
Abstract Electromagnetic wave refractions have been widely explored due to their profound physics and practical applications, especially the negative refraction. However, hyperbolic feature of Maxwell equations makes it difficult extend related Fourier conduction because equation is parabolic. To solve problem, we study thermal waves convection can additionally introduce heat transfer. We further design convection-assisted metamaterials realize positive, vertical, waves, which a phenomenal...
Bending behaviors of corroded reinforced concrete (RC) beams under repeated loading were investigated experimentally. A total twenty test specimens, including four non-corrosion and sixteen corrosion beams, prepared tested. numerical model for flexural cracking the beam was also developed. Effects steel on regarding cracking, mid-span deflection, stiffness bearing capacity studied. The impact bond strength as key factor to develop computational capacity. It shown from experimental results...