Chemical-Free Pest Control by Means of Dielectric Heating with Radio Waves: Selective Heating

2017 ◽  
Vol 41 (1) ◽  
pp. 116-123 ◽  
Author(s):  
Markus Kraus ◽  
Frank Holzer ◽  
Christian Hoyer ◽  
Ulf Trommler ◽  
Frank-Dieter Kopinke ◽  
...  
Keyword(s):  
Pest Control ◽  
Dielectric Heating ◽  
Radio Waves ◽  
Selective Heating

Chemical-Free Pest Control by Dielectric Heating with Radio Waves and Microwaves: Thermal Effects

2017 ◽  
Vol 41 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Christian Hoyer ◽  
Christian Pfütze ◽  
Rudy Plarre ◽  
Ulf Trommler ◽  
Steffen Steinbach ◽  
...  
Keyword(s):  
Pest Control ◽  
Thermal Effects ◽  
Dielectric Heating ◽  
Radio Waves

On the Role of Water in Dielectric Heating with Radio Waves

2009 ◽  
Vol 32 (5) ◽  
pp. 754-762 ◽  
Author(s):  
U. Roland ◽  
F.-D. Kopinke
Keyword(s):  
Dielectric Heating ◽  
Radio Waves

Investigation of Microwave Field Selective Heating on Two-Phase System

2013 ◽  
Vol 448-453 ◽  
pp. 3005-3008
Author(s):  
Jian Yu Xing ◽  
Xiu Ling Song ◽  
Bo Bai ◽  
Shao Kun Lu ◽  
Hai Peng Liu
Keyword(s):  
Heat Transfer ◽  
Microwave Field ◽  
Reaction Times ◽  
Power Input ◽  
Heating Process ◽  
Phase System ◽  
Dielectric Heating ◽  
Distillation Process ◽  
Two Phase ◽  
Selective Heating

Microwaves represent an alternative way of power input into distillation process. Through dielectric heating, reaction mixtures are homogenously heated without contact to a wall. Reaction times are significantly reduced compared to conventionally (thermally) heated systems while maintaining selectivity. In this paper, microwave field select heating on two-phase system has been investigated numerically and experimentally. Temperature increasing, heat transfer and evaporation during heating process were analyzed. The possibility of microwave used for distillation was examined and proposed.

SELECTIVE HEATING BY SHORT RADIO WAVES AND ITS APPLICATION TO ELECTROTHERAPY

1931 ◽  
Vol 5 (5) ◽  
pp. 550-566 ◽  
Author(s):  
J. C. McLennan F.R.S. ◽  
A. C. Burton M.A.
Keyword(s):  
High Frequency ◽  
Wave Length ◽  
Theoretical Explanation ◽  
The Body ◽  
Radio Waves ◽  
High Frequencies ◽  
Selective Effect ◽  
Selective Heating ◽  
Determining Factors ◽  
Frequency Oscillator

In the first part of the paper the theoretical basis of the formulas, given in a previous communication, for the generation of heat in a poorly conducting dielectric which is placed in the field of a high-frequency oscillator, is examined in some detail. Its application to the complicated case met with in medical "radiothermy" is made and it is shown that the analysis applies with satisfactory accuracy to this case, though not to that of electrode diathermy. Prediction of the "selective" effect is possible from a knowledge of the characteristic electrical constants of the body-substances at high frequencies, and by proper choice of wave-length the heating of a particular part might be favored over that of neighboring parts.In the second part of the paper, experimental work is described which carries verification of the formulas to shorter wave-lengths. Experiments on the heating of meat demonstrate the selective effect and its dependence upon wave-length. The heating of such substances as liver, heart, and the different parts of an egg, are examined experimentally as examples of the various determining factors that are involved.The theoretical explanation of the effects is considered satisfactory and further developments depend upon the results of in viva experiments with shorter wavelengths than those at present in general use.

THE HEATING OF ELECTROLYTES IN HIGH FREQUENCY FIELDS

1930 ◽  
Vol 3 (3) ◽  
pp. 224-240 ◽  
Author(s):  
J. C. McLennan F.R.S. ◽  
A. C. Burton M.A.
Keyword(s):  
Dielectric Constant ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Skin Effect ◽  
Specific Conductivity ◽  
Wave Length ◽  
Radio Waves ◽  
Selective Heating ◽  
Heating Effects ◽  
Maximum Heating

In this investigation the heating of solutions of simple electrolytes of varying concentrations when irradiated by short electromagnetic waves from 10 to 200 metres in length was measured. It was found that for a given wave-length there is a maximum heating effect produced in a medium, the specific conductivity and dielectric constant of which are connected with the frequency by a simple law. This law, proved theoretically as well as shown experimentally to hold for dilute solutions is [Formula: see text] where C = specific conductivity in absolute units, K = dielectric constant and n = frequency of wave."Skin effect" was shown theoretically and experimentally to be negligible for substances having the low conductivities studied and deep-seated heating effects were shown to be attainable with the radio waves used. The possibility of directed selective heating effects is suggested and illustrated by experiments on blood. The law shown to apply in these experiments was used to evaluate the dielectric constant of water.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

Radio Waves Kill Insect Pests

1933 ◽  
Vol 148 (5) ◽  
pp. 272-273 ◽  
Author(s):  
J. H. Davis
Keyword(s):  
Insect Pests ◽  
Radio Waves
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