A5100393225- Metamaterials and Metasurfaces Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Plasmonic and Surface Plasmon Research
- Climate variability and models
- Meteorological Phenomena and Simulations
- Plant Water Relations and Carbon Dynamics
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Cryospheric studies and observations
- Flow Measurement and Analysis
- Antenna Design and Analysis
- Climate change and permafrost
- Terahertz technology and applications
- Advanced Sensor Technologies Research
- Intermetallics and Advanced Alloy Properties
- Fatigue and fracture mechanics
- Optical Systems and Laser Technology
- Structural Analysis and Optimization
- Atmospheric aerosols and clouds
- Microstructure and Mechanical Properties of Steels
- Additive Manufacturing Materials and Processes
- Analytical Chemistry and Sensors
- Advanced Antenna and Metasurface Technologies
- Fuel Cells and Related Materials
China Meteorological Administration
2023-2024
Hebei University of Technology
2024
Beijing Institute of Technology
2016-2023
Chinese Academy of Meteorological Sciences
2023
University of Connecticut
2020-2022
Hefei National Center for Physical Sciences at Nanoscale
2022
University of Science and Technology of China
2022
Nanjing University of Information Science and Technology
2020-2021
Guilin University of Technology
2021
California Institute of Technology
2011-2016
We report results of quantum mechanics (QM) mechanistic studies Nafion membrane degradation in a polymer electrolyte (PEM) fuel cell. Experiments suggest that is caused by generation trace radical species (such as OH●, H●) only when the presence H2, O2, and Pt. use density functional theory (DFT) to construct potential energy surfaces for various plausible reactions involving intermediates might be formed exposed H2 (or H+) O2 Pt catalyst. find barrier 0.53 eV OH formation from HOOH...
Metasurfaces have become a new photonic structure for providing potential applications to develop integrated devices with small thickness, because they can introduce an abrupt phase change by arrays of scatterers. To be applied more widely, active metasurface are highly desired. Here, tunable terahertz meta-lens whose focal length is able electrically tuned ∼4.45λ demonstrated experimentally. The lens consists metallic and monolayer graphene. Due the dependence on graphene chemical...
Abstract. Subseasonal-to-seasonal (S2S) prediction, especially the prediction of extreme hydroclimate events such as droughts and floods, is not only scientifically challenging, but also has substantial societal impacts. Motivated by preliminary studies, Global Energy Water Exchanges (GEWEX)/Global Atmospheric System Study (GASS) launched a new initiative called “Impact Initialized Land Surface Temperature Snowpack on Subseasonal to Seasonal Prediction” (LS4P) first international grass-roots...
Abstract. Densely populated southern China, adjacent to the South China Sea, which is associated with shallow precipitation during summer, an open-air natural laboratory for studying impact of aerosol particles on shallow-precipitation events. Using 8 years data from Dual-frequency Precipitation Radar measurements, reanalysis, and atmospheric this study investigates potential influence coarse fine structure microphysical processes in China. Statistical results indicate that...
Metasurfaces have proven their great application potentials in terahertz (THz) wave modulations. However, realizing an active metasurface retaining lensing functionality the THz frequency regime is still highly desired. Here a metalens, featuring electrically tunable focal length, based on propagation phase delay, proposed and demonstrated experimentally. To full control over designed lens functionality, gold thin film etched with C-shaped aperture antenna array covered by monolayer graphene...
Metasurfaces, which are composed of arrays scatters, can introduce abrupt change optical properties. However, they lack flexibility to achieve active control. Here we propose a meta-lens with tunable focal length assisted by graphene at terahertz frequencies. The consists monolayer and gold film etched rectangle apertures different lengths rotation angles. By adjusting the gate voltage applied on layer uniformly, chemical potential changes from 0.1 eV 0.3 eV, is changed 1.25λ continually....
Laser-induced graphene (LIG) has received a large amount of attention because its superior properties high electrical conductivity, thermal stability and simple synthesis, the low fabrication cost patterned structures. However, most studies on LIG are focused applications. In this work, we first examine effect substrate generated polyimide then fabricate structures including gratings Fresnel zone plates for terahertz (THz)-wave modulations. The functions experimentally demonstrated by THz...
Abstract This study investigates the potential effects of historical deforestation in South America using a regional climate model driven with reanalysis data. Two different sources data were used to quantify during 1980s 2010s, leading two scenarios forest loss: smaller but spatially continuous scenario 1 and larger scattered 2. The simulates generally warmer drier local following deforestation. Vegetation canopy becomes due reduced evapotranspiration, ground more radiation reaching ground....
Abstract Optical pattern recognition (OPR) has the advantage of single intensity detection ability for low‐cost terahertz (THz) systems imaging or security checks. However, conventional 4 f ‐system‐based OPR is limited by paraxial approximation and bulky device volumes THz applications. Here, a full‐diffraction‐based ‐less method proposed using complex‐amplitude‐modulating metasurface, which valid with large Fresnel numbers. Moreover, laser‐induced graphene technique applied processing...
Due to the high design freedom, metasurfaces are widely applied realize miniaturized optical devices with performance. Recently, assisted by design, monochromatic aberration–corrected lenses, composed of two metasurface layers, have been proposed for a well-focused light spot in focal plane at large incident angles. However, focus cannot be tuned these structures. In this paper, based on principle Moire lens, wide-angle (±30∘) metalens continuously tunable and that consists cascaded...
Abstract This study compares two ensemble methods, pseudo global warming (PGW) and multimodel (MME) mean in evaluating future vegetation‐climate changes feedback over East Asia using a regional model driven with boundary conditions derived from historical RCP8.5 runs of four models. Over most the domain, MME PGW produce similar climate changes, except for regions: Northeast Asia, projects less winter increase summer precipitation than PGW, North China Plain, greater PGW. Both project leaf...
Graphene-based terahertz (THz) metasurfaces have the advantages of ultra-small thickness, electrical tunability, and fast tuning speed. However, many such structures suffer low efficiency, especially for transmissive devices. Here we propose a hybrid structure focusing THz waves with tunability enhanced which is composed graphene-loaded metallic metasurface sandwiched by two mutually orthogonal gratings. Experimental results show that due to multi-reflection between layer grating layer,...
Abstract. Sub-seasonal to seasonal (S2S) prediction, especially the prediction of extreme hydroclimate events such as droughts and floods, is not only scientifically challenging but has substantial societal impacts. Motivated by preliminary studies, Global Energy Water Exchanges (GEWEX)/Global Atmospheric System Study (GASS) launched a new initiative called Impact initialized Land Surface temperature Snowpack on Seasonal Prediction (LS4P), first international grass-root effort introduce...
Abstract This study assesses the ecohydrological effects of recent meteorological droughts in tropical South America based on multiple sources data, and investigates possible mechanisms underlying drought response recovery different systems. Soil lag behind drought, with delays longer dry region (Nordeste) than wet (Amazonia), deep soil shallow soil. Evapotranspiration (ET) vegetation Nordeste are limited by water under normal conditions decrease promptly to onset drought. In most Amazon...
Metasurfaces are ultrathin films with metallic nano-antennas for generating abrupt wavefront changes of electromagnetic waves. However, the phase modulation is hard to change once a metasurface structure fabricated. Here we show that, assisted by monolayer graphene, tunable devices able be realized. Based on Berry geometrical phase, design graphene-metal lens at mid-infrared frequencies. The focal length can controlled dynamically uniformly adjusting gate voltage applying graphene layer....
7075-T6 is widely used in the fabrication of aircraft structural components, majority which are joined and assembled through hole structures. However, geometric discontinuity near fastener holes facilitates stress concentration makes joints susceptible to crack initiation fatigue failure. It essential enhance structure's resistance. In this work, factors affecting split-sleeve cold expansion on behavior 7075-T651 studied based compressive residual stress, microstructure, surface roughness,...
Surface plasmon polaritons (SPPs) have shown huge application potentials in photonic on-chip devices, sensing, imaging, and metamaterials. However, the terahertz (THz) regime, metals used visible near infrared frequencies cannot support SPPs due to their near-zero skin depth. At present, feasible methods mainly include exploiting spoof through complex structural design on or using semiconductors. In this work, we experimentally demonstrate that porous graphene induced by laser beams with low...
Abstract The promiscuous encapsulation of π‐electron‐rich guests by the π‐electron‐deficient host, cyclobis(paraquat‐ p ‐phenylene) (CBPQT 4+ ), involves formation 1:1 inclusion complexes. One most intensely investigated charge‐transfer (CT) bands, assumed to result from a guest molecule inside cavity CBPQT , is an emerald‐green band associated with complexation tetrathiafulvalene (TTF) and its derivatives. This interpretation was called into question recently in this journal based on...