Results 221 to 230 of about 332,732 (276)
Advanced Science, EarlyView.A metasurface‐enabled ultrasonic platform achieves precise multi‐focal control through biological barriers, real‐time physiology‐driven modulation, and simultaneous wireless power and data transmission. By unifying wavefront engineering, closed‐loop feedback, and acoustic communication, this work establishes key enabling technologies toward scalable ...
Chuanxin Zhang +3 more
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Metasurface‐Enabled Active‐Like Passive Radar
Advanced Science, EarlyView.A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li +7 more
wiley +1 more source
Advanced Science, EarlyView.A continuous conductivity gradient is formed in a porous MXene/melamine foam via directional evaporation, thereby improving impedance matching and enhancing electromagnetic attenuation. The resulting monolithic composite delivers absorption‐dominant EMI shielding with ultralow reflection, offering a simple route toward lightweight EMI shielding ...
Dawei Zhang +6 more
wiley +1 more source
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Nonlinear Electromagnetic X Waves
Physical Review Letters, 2003Nonlinear optical media that are normally dispersive support a new type of localized (nondiffractive and nondispersive) wave packets that are X shaped in space and time and have slower than exponential decay. High-intensity X waves, unlike linear ones, can be formed spontaneously through a trigger mechanism of conical emission, thus playing an ...
CONTI C. +6 more
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1992
The physical mechanism in the free-electron laser depends upon the propagation of an electron beam through a periodic magnetic field. Both incoherent and coherent radiation results from the undulatory motion of the electron beam in the external fields which permits a wave-particle coupling to the output radiation.
H. P. Freund, T. M. Antonsen
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The physical mechanism in the free-electron laser depends upon the propagation of an electron beam through a periodic magnetic field. Both incoherent and coherent radiation results from the undulatory motion of the electron beam in the external fields which permits a wave-particle coupling to the output radiation.
H. P. Freund, T. M. Antonsen
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Physical Review, 1956
The growth of radio and other electromagnetic waves is considered in terms of the ion motions of Bailey's electromagneto-ionic theory, of a double electron stream and other factors. These conclusions are reached: (i) The electromagneto-ionic theory predicts spurious growing waves which do not correspond to any interchange of energy between gas and ...
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The growth of radio and other electromagnetic waves is considered in terms of the ion motions of Bailey's electromagneto-ionic theory, of a double electron stream and other factors. These conclusions are reached: (i) The electromagneto-ionic theory predicts spurious growing waves which do not correspond to any interchange of energy between gas and ...
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Electromagnetic Fields and Electromagnetic Waves
2017Microwaves are not a simple heat source. Substances are heated directly by electromagnetic waves at energies commensurate with microwaves. Therefore, an understanding of the nature of these electromagnetic waves is the dominating discussion on microwave heating.
Satoshi Horikoshi +3 more
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Physics Today, 1950
A symposium on the theory of electromagnetic waves was held at New York University at Washington Square under the joint sponsorship of NYU and the Geophysical Research Directorate of the Air Force Cambridge Research Laboratory on June 6, 7, and 8, 1950.
L. Kraus, J. Lurye, J. Shmoys
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A symposium on the theory of electromagnetic waves was held at New York University at Washington Square under the joint sponsorship of NYU and the Geophysical Research Directorate of the Air Force Cambridge Research Laboratory on June 6, 7, and 8, 1950.
L. Kraus, J. Lurye, J. Shmoys
openaire +1 more source