A5034560236- Acoustic Wave Phenomena Research
- Underwater Acoustics Research
- Photoacoustic and Ultrasonic Imaging
- Ultrasonics and Acoustic Wave Propagation
- Ultrasound and Hyperthermia Applications
- Metamaterials and Metasurfaces Applications
- Thermography and Photoacoustic Techniques
- Acoustic Wave Resonator Technologies
- Particle physics theoretical and experimental studies
- Speech and Audio Processing
- Advanced MEMS and NEMS Technologies
- Innovative Energy Harvesting Technologies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Topological Materials and Phenomena
- Thermal Radiation and Cooling Technologies
- Textile materials and evaluations
- Particle accelerators and beam dynamics
- Ultrasound Imaging and Elastography
- Indoor and Outdoor Localization Technologies
- Micro and Nano Robotics
- Microwave Imaging and Scattering Analysis
- Advanced Fiber Optic Sensors
- Aerodynamics and Acoustics in Jet Flows
University of Wisconsin–Madison
2020-2025
Nanjing University
2023
University of Hong Kong
2023
Massachusetts Institute of Technology
1979-2021
The University of Texas at Austin
2021
Walker (United States)
2021
Duke University
2021
IIT@MIT
2014-2019
Shanghai Jiao Tong University
2013
Deutsches Elektronen-Synchrotron DESY
1979-1981
Abstract Sea animals such as leptocephali develop tissues and organs composed of active transparent hydrogels to achieve agile motions natural camouflage in water. Hydrogel-based actuators that can imitate the capabilities will enable new applications diverse fields. However, existing hydrogel actuators, mostly osmotic-driven, are intrinsically low-speed and/or low-force; their have not been explored. Here we show hydraulic actuations with designed structures properties give soft robots...
Abstract Acoustics is a classical field of study that has witnessed tremendous developments over the past 25 years. Driven by novel acoustic effects underpinned phononic crystals with periodic modulation elastic building blocks in wavelength scale and metamaterials localized resonant units subwavelength scale, researchers diverse disciplines physics, mathematics, engineering have pushed boundary possibilities beyond those long held as unbreakable limits. More recently, structure designs...
In this Letter, we theoretically propose and experimentally demonstrate a three-dimensional soundproof acoustic cage structure, hereby denoted as an metacage. The metacage is composed of six metamaterial slabs with open holes hidden bypass space coiling tunnels connected to the holes. Band structure analysis reveals novel physical mechanism low-frequency broad partial band gap via folding in other directions, which can also be interpreted by effective medium indefinite mass density negative...
Abstract Whether intentionally generating acoustic waves or attempting to mitigate unwanted noise, sound control is an area of challenge and opportunity. This study investigates traditional fabrics as emitters suppressors sound. When attached a single strand piezoelectric fiber actuator, silk fabric emits up 70 dB Despite the complex structure, vibrometer measurements reveal behavior reminiscent classical thin plate. Fabric pore size relative viscous boundary layer thickness found—through...
Abstract Real-time, low-cost, and wireless mechanical vibration monitoring is necessary for industrial applications to track the operation status of equipment, environmental proactively predict natural disasters, as well day-to-day such vital sign monitoring. Despite this urgent need, existing solutions, laser vibrometers, commercial Wi-Fi devices, cameras, lack wide practical deployment due their limited sensitivity functionality. Here we proposed a fully passive, metamaterial-based...
Abstract Materials capable of varying their acoustic impedances to match those air, water, and solid materials over broadband frequencies will enable new applications in fields as diverse medical imaging, underwater sonar communication, marine biology. However, such tunability has not been achieved with conventional including metals, polymers, ceramics woods. Here, the invention metagel, a class designed hydrogel composites unprecedented tunable properties frequencies, is reported. The...
The resolution of acoustic imaging suffers from diffraction limit due to the loss evanescent field that carries subwavelength information. Most current methods for overcoming in acoustics still operate near-field object. Here we demonstrate design and experimental realization an far-field system. Our system is based on wave vector filtering conversion with a transmitter at spatially symmetrical receiver far-field. By tuning geometric parameters transmitting/receiving pair, different spatial...
There is a long-existing trade-off between the imaging resolution and penetration depth in acoustic caused by diffraction limit. Most existing approaches addressing this require controlled “labels,” i.e., metamaterials or contrast agents, to be deposited close objects either remain static tracked precisely during imaging. We propose “blind-label” approach for subwavelength The blind labels are randomly distributed scatterers with deep-subwavelength sizes whose exact locations trajectories...
Acoustic metamaterials have recently been applied to assist in the remote manipulation of objects air, showing remarkable potential alleviating constraints non-metamaterial-based acoustic methods regarding object...
We propose a method to design bifunctional acoustic lens using metamaterials that possess separate functions at different directions. The proposed can be implemented in practice with subwavelength unit cells exhibiting effective anisotropic parameters. With this methodology, we experimentally demonstrate an Luneburg-fisheye operational frequencies from 6300 Hz 7300 Hz. Additionally, square is focal lengths for multi This paves the way manipulating energy flows functional lenses.
We have performed a high-statistics measurement of Bhabha scattering and the production hadrons in electron-positron annihilation at PETRA energies ($12 \mathrm{GeV}<~\sqrt{s}<~36.7 \mathrm{GeV}$). Combining results with measurements ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ enables us to compare our electroweak theory. find ${{sin}^{2}\ensuremath{\theta}}_{w}=0.27\ifmmode\pm\else\textpm\fi{}0.08$. This is...
Previous acoustic cloaks designed with transformation acoustics always involve inhomogeneous material. In this paper, a design of polygonal cloak is proposed using linear method. The has homogeneous and anisotropic parameters, which much easier to realize in practice. Furthermore, possible metamaterial structure the proposed. Simulation results on real show that effective reduce scattering object.
The resolution of far-field imaging systems suffers from the diffraction limit. In this work, a blind structured illumination microscopy (blind-SIM) system that achieves subwavelength in acoustic is developed. blind-SIM, precise knowledge (SI) patterns not required. Instead, SIs are generated by randomly located grating with period. spatial frequency mixing between object and converts evanescent waves to propagating can reach sensors far field. image then reconstructed multiple measurements...
We report the first measurement of ratio R=(σe+e−→hadrons)(σe+e−→μ+μ−) (with negligible τ-lepton contribution) at a center-of-mass energy s=13 GeV and s=17 GeV, from just finished electron-positron colliding-beam facility PETRA. The detector, MARK-J, has an approximately 4π solid angle measures γ, e, μ, charged neutral hadrons simultaneously. Our results yield R(s=17 GeV)=4.9±0.6 (statistical) ±0.7 (systematic error), R(s=13 GeV)=4.6±0.5 error). GeV)R(s=13 GeV) is 1.08±0.18.Received 6...
In this work, we theoretically propose and experimentally demonstrate a kind of nonreflecting acoustic metamaterial fence that is perfectly impedance matched to air over wide range incident angles broad frequency band. The composed an array rigid cylinders with alternating layers different cylinder diameters. It designed by spatially dispersive effective medium theory demonstrated airborne sound reflectance measurements. Our work provides unique approach design realize structures can...
Acoustic topological systems explore behaviors of phononic crystals. Currently, most the experimentally demonstrated acoustic are for airborne waves and work at or below kHz frequency range. Here, we report an underwater waveguide that works MHz The 2D was formed interface two hexagonal lattices with different pillar radii were fabricated metal additive manufacturing. We existence edge stages both numerically in experiments. Our has potential applications underwater/biomedical sensing,...
Abstract We conduct a simulation-based study to investigate the impact of dynamic temperature environment on characteristics microwave-induced thermoacoustic signals. signals that are generated using an interstitial microwave ablation antenna powered by microsecond pulsed source. Two regimes examined: first, spatially uniform throughout medium experimentally validate simulation model, and second, realistic, nonuniform profiles arise during ablation. employ multi-physics model considers...