Results 261 to 270 of about 1,086,608 (306)

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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The Absorption of Microwaves by Gases

Journal of Applied Physics, 1946
The absorption by ammonia of electromagnetic waves having a length in the one-centimeter range has been known for some years. An investigation has been made to determine whether other gases show similar absorption for microwaves and as a result fourteen additional gases have been found whose absorption is comparable to that of ammonia.
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Microwave Absorption in Rare-Earth Metals

Journal of Applied Physics, 1965
Microwave absorption phenomena have been investigated in single crystals of the rare-earth metals Tb, Dy, Ho, and Er, at frequencies of 9.44 and 35.3 Gc/sec over the temperature range 10° to 290°K. Microwave absorption occurs at the critical field transitions for the antiferromagnetic phase.
D.M.S. Bagguley, J. Liesegang
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The Absorption of Microwaves by Oxygen

Physical Review, 1947
Even though electrically non-polar, oxygen gas absorbs microwaves because the magnetic moment of the ${\mathrm{O}}_{2}$ molecule interacts with electromagnetic fields. The resulting absorption is most pronounced, exceeding 10 db/km, for wave-lengths in the vicinity of \textonehalf{} cm, for then there is resonance to the spacings in the "rho-type ...
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Microwave absorption in aqueous solutions of DNA

Nature, 1987
In a recent Nature leading article the possibility of the occurrence of resonance absorption at microwave frequencies in DNA was discussed in terms of the latest available theoretical and experimental evidence, and its implications were assessed. Because of the far-reaching nature of these implications it is important that the existence or otherwise of
C, Gabriel, E H, Grant, R, Tata, P R, Brown, B, Gestblom, E, Noreland   +5 more
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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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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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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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Dielectric Absorption of Microwaves in Human Tissues

Nature, 1968
Calculations show that differences in absorption of microwaves by the human body may be a means of localizing tumours and some body ...
J R, Mallard, T A, Whittingham
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Critical Slowing-Down in Microwave Absorptive Bistability

Topical Meeting on Optical Bistability, 1982
In this experiment one utilizes a microwave confocal open resonator in the transmission configuration, having a Q factor of 5 105. The resonator is filled with ammonia gas at the pressure of 1 mTorr. A klystron oscillator, frequency stabilized on the 3-3 ammonia inversion line, feeds the resonator which is tuned at the same frequency.
BARBARINO S, GOZZINI A, MACCARRONE, FRANCESCO, LONGO I, STAMPACCHIA R.   +4 more
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