Results 241 to 250 of about 234,397 (278)

Nonlinear absorption of intense microwave pulses

Physical Review Letters, 1987
Free-electron lasers in the electron cyclotron frequency range have been proposed as an efficient means of heating and driving current in tokamak plasmas. The proposed free-electron laser will have short pulses (approx. =5 x 10/sup -8/ sec) with a peak power of (4--8) x 10Z W and electric fields within the plasma in the range 10V--10W V/cm.
, Nevins, , Rognlien, , Cohen
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Microwave absorption by folded DNA chains

Biopolymers, 1982
AbstractAbsorption of radiation by DNA polymer is calculated for the case of bent polymer chains. The molecule is assumed to be straight except for localized bends. The region between two bends is studied in particular. The vibrational properties of the bends are parameterized by a transmission and a reflection coefficient.
M, Kohli, L L, VanZandt
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Nonlinear microwave absorption in Ba1−xKxBiO3

Physica C: Superconductivity, 1994
Nonlinear, field-modulated, direct microwave absorption (FMMA) was observed in copper-free Ba1-xKxBiO3 powder samples. The high-field, low-temperature results were compared to previous measurements of YBa CuO and BiSrCaCuO. The microwave wave determined critical field μ0H* = 0.7 μT and depinning current density J* c ≈ 1 × 107 A/m2 were obtained from ...
Warden M., Ivanshin V., Erhart P.
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Microwave Absorption Behaviour

2016
The high-frequency absorption behaviour of amorphous ferromagnetic materials, among others, is of considerable interest for microwave absorber applications (Vazquez and Adenot-Engelvin in J Magn Magn Mater 321:2066–2073, 2009). Since amorphous glass-coated microwires have small dimensions (1–30 µm in diameter), high electrical conductivity (~6×105 S/m),
Hua-Xin Peng, Faxiang Qin, Manh-Huong Phan   +2 more
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Microwave absorption performance of ZnAl2O4

Chemical Engineering Journal, 2020
Abstract The morphological modification has demonstrated that can pave the way of the microwave absorbing materials. The ZnAl2O4 nanoparticles with diverse morphology have been tailored using modified sol-gel and solvothermal methods. 2D structures and hollow blueberry like morphologies of the ZnAl2O4 nanostructures were architected by the sucrose ...
Reza Peymanfar, Farbod Fazlalizadeh
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Modulated microwave absorption in superconducting mercury

Physical Review B, 1989
Modulated microwave absorption spectra associated with the intermediate state have been observed at 15.1 GHz for an oblong mercury sample. The use of a liquid-helium bath eliminated the thermal instabilities associated with modern, gas-flow cooling systems.
, Rubins, , Black, , Jeong
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Microwave spectrometer for saturated absorption experiments

Review of Scientific Instruments, 1978
A spectrometer has been built to perform Doppler-free saturated absorption experiments in the millimeter range (30–300 GHz); a plane-cylindrical resonator between Stark plates has been used. With that device, inverted Lamb-dips have been observed at 115 GHz with a width 25 times below the Doppler width.
J, Legrand, B, Ségard, A, Krosta, B, Macke   +3 more
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Microwave absorption spectroscopy

Journal of Chemical Education, 1966
Examines the theory of microwave absorption, microwave techniques, microwave sources, and microwave spectrometers.
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Reducing Microwave Absorption with Chaotic Microwaves

2017
We study the response of a two-level quantum system to a chaotic signal using numerical methods and compare it to the response to a sinusoidal signal. We expect the largest response for sinusoidal driving functions, because the Schrodinger equation is linear. The method is based on numerical solutions of the Schrodinger solution of the two-level system,
Juehang Qin, A. Hubler
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Dosimetry and Microwave Absorption

2021
Microwaves must be coupled into the biological body and energy must be transferred, deposited, and absorbed by tissues in the body for the system to respond in some manner. The exposure may produce highly complicated distributions of RF and microwave energy within the subject, regardless of the uniformity of external exposure.
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