Possibility of Microwave-Controlled Surface Modification

1996 ◽  
Vol 430 ◽  
Author(s):  
K. I. Rybakov ◽  
V. E. Semenov
Keyword(s):  
Surface Modification ◽  
Electric Field ◽  
Mass Transport ◽  
Electric Fields ◽  
High Frequency ◽  
Theoretical Study ◽  
Surface Effects ◽  
Moderate Intensity ◽  
Crystalline Solids ◽  
Periodic Profile

AbstractResults of the theoretical study of surface effects in ionic crystalline solids under the action of high-frequency electric fields of moderate intensity are presented. The averaged ponderomotive action of the electric field on the charged vacancies within the crystal causes directional mass transport that leads to development of a surface instability. The analysis shows that the proposed effect can result in the formation of a periodic profile on the surface.

Mass Transport and DC Electromotive Force Induced in Ionic Crystals by High-Frequency Electric Field

1994 ◽  
Vol 369 ◽  
Author(s):  
K. I. Rybakov ◽  
V. E. Semenov
Keyword(s):  
Electric Field ◽  
Mass Transport ◽  
Electric Fields ◽  
High Frequency ◽  
Theoretical Study ◽  
Moderate Intensity ◽  
Ionic Crystals ◽  
Crystalline Materials ◽  
High Frequency Electric Field ◽  
Electromagnetic Pressure

AbstractResults of the theoretical study of the effects produced on ionic crystals by highfrequency electric fields of moderate intensity are presented. The ponderomotive action of the electric field on the space charge induced by it in a thin layer within the crystal near its surface causes directional mass transport that leads to plastic deformation and induces a stationary distribution of electric potential. The analysis shows that the proposed effect (that appears to be equivalent to the action of mechanical stresses which exceed the electromagnetic pressure by many orders of magnitude) can influence the results of processing of ionic crystalline materials significantly.

Characterization of interactive force acting on colloidal particles near an electrode in presence of a high-frequency (>10 kHz) AC electric field using particle diffusometry

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Kshitiz Gupta ◽  
Dong Hoon Lee ◽  
Steven T. Wereley ◽  
Stuart J. Williams
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Particle Motion ◽  
Electrode Surface ◽  
High Frequency ◽  
Colloidal Particles ◽  
Low Frequency ◽  
Double Layers ◽  
Average Height ◽  
Ac Electric Field

Colloidal particles like polystyrene beads and metallic micro and nanoparticles are known to assemble in crystal-like structures near an electrode surface under both DC and AC electric fields. Various studies have shown that this self-assembly is governed by a balance between an attractive electrohydrodynamic (EHD) force and an induced dipole-dipole repulsion (Trau et al., 1997). The EHD force originates from electrolyte flow caused by interaction between the electric field and the polarized double layers of both the particles and the electrode surface. The particles are found to either aggregate or repel from each other on application of electric field depending on the mobility of the ions in the electrolyte (Woehl et al., 2014). The particle motion in the electrode plane is studied well under various conditions however, not as many references are available in the literature that discuss the effects of the AC electric field on their out-of-plane motion, especially at high frequencies (>10 kHz). Haughey and Earnshaw (1998), and Fagan et al. (2005) have studied the particle motion perpendicular to the electrode plane and their average height from the electrode mostly in presence of DC or low frequency AC (<1 kHz) electric field. However, these studies do not provide enough insight towards the effects of high frequency (>10 kHz) electric field on the particles’ motion perpendicular to the electrode plane.  

Some Applications of High-Frequency Electric Currents to the Latex Industry

1938 ◽  
Vol 11 (3) ◽  
pp. 570-574
Author(s):  
Henri Leduc
Keyword(s):  
Dielectric Loss ◽  
Electric Field ◽  
Electric Fields ◽  
High Frequency ◽  
Specific Effect ◽  
Entire Body ◽  
Rubber Latex ◽  
Joule Effect ◽  
High Frequency Electric Field ◽  
Rubber Particles

Abstract The “radiocoagulation” of latex has been developed in the laboratories of L'Office National des Recherches et Inventions by Dufour and Leduc, who conceived the idea of applying the effect of electric fields of high frequency to rubber latex. When latex is exposed to the action of an electric field of high frequency, the entire body of liquid is heated uniformly, provided that the electric field itself is uniform. The causes of this heating effect are difficult to ascertain because various phenomena are involved simultaneously, e. g., a dielectric loss in the rubber and a loss by the Joule effect in the serum. Each of these effects is, according to conditions, the predominant one, e. g., by increasing the conductivity of the serum, electrolytes such as sodium sulfate or ammonium sulfate increase the Joule loss, U2/R, whereas an increase in the concentration of latex tends to increase the dielectric loss. Finally, since rubber particles are not electrically neutral, they are subject to alternating forces of the electric field, which is a specific effect of the high frequency, and these forces impart to the rubber particles movements throughout the liquid. Now latex can be rendered sensitive to mechanical forces, i. e., some mixtures can be coagulated by slight agitation. Accordingly it is conceivable that a high-frequency electric field, by setting the rubber particles in motion throughout the emulsion, is capable of coagulating a mass of latex exposed to the field.

scholarly journals An Analogy Between the Effects of Fluctuating Electric Fields and Steady Magnetic Fields in Isotropic Conductors when a Universal Relaxation Time Cannot Be Defined

1960 ◽  
Vol 13 (1) ◽  
pp. 95
Author(s):  
EJ Moore
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Electric Field ◽  
Electric Fields ◽  
High Frequency ◽  
Present Note ◽  
Isotropic Solid ◽  
High Frequency Electric Field ◽  
Circular Frequency ◽  
Steady Magnetic Field

It is well known that when a " universal" time of relaxation ("t') exists, the influence of a harmonically varying electric field (F cceiOlt) on the transport properties of a solid may be taken into account by replacing "t' by "t'/(l +iCil"t'). Dingle (1956a) demonstrated that, for an isotropic solid, the effect of a steady magnetic field may similarly be obtained by replacing "t' by "t'/(l+j~l"t') with an applied d;c. electric field, and by "t'/[l+(iCil+jO)"t'] with an a.c. field. (Here j2= -1, ij -=1= -1, and 0=( -e)H/mc is the circular frequency of precession of an electron.) The object of the present note is to show that this analogy between a high frequency electric field and a steady magnetic field still exists, even when a " universal" relaxation time cannot be defined.

scholarly journals Sensor of high frequency electric fields intensity on the base of slot waveguides with electro-optic polymer filling

2020 ◽  
Vol 4 (4) ◽  
pp. 378-388
Author(s):  
Игорь Андреевич Гончаренко ◽  
Виталий Николаевич Рябцев ◽  
Александр Васильевич Ильюшонок ◽  
Олег Дмитриевич Навроцкий
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Optical Sensor ◽  
High Frequency ◽  
Method Of Lines ◽  
Application Field ◽  
Optical Polymer ◽  
Electro Optic ◽  
Slot Waveguides

Purpose. Development of the structure and operation principles of high frequency electric fields intensity optical sensor. Methods. Method of lines was used for calculation of propagation constants and mode electric fields distribution of strip waveguides with vertical and horizontal slots filled with electro-optical polymer SEO125. Findings. The structure and operation principles of high frequency electric fields intensity sensor on the base of slot waveguides with vertical and horizontal slots filled with electro-optical polymer are proposed. Sensor makes it possible measuring the variable electric fields with frequencies up to 10 MHz. The sensor sensitivity order is of 30 V/m. Application field of research. Determination of fire-dangerous and injurious factors of electric field during emergencies elimination.

scholarly journals RESEARCH OF INFLUENCE OF HIGH-FREQUENCY ELECTRICAL FIELD ON SOWING QUALITY OF CEREAL SEEDS

2019 ◽  
pp. 95-99
Author(s):  
Ivan Solovey
Keyword(s):  
Electric Field ◽  
Winter Wheat ◽  
Electric Fields ◽  
High Voltage ◽  
High Frequency ◽  
Experimental Studies ◽  
Voltage Source ◽  
Seed Systems ◽  
High Frequency Electric Field ◽  
Frequency Electric Field

A study on the effect of high-frequency electric field on cereal seeds to increase seed germination and plant growth is presented. The study was conducted in the treatment of winter wheat seeds. High-voltage electric fields are one of the promising means of influencing crop seeds. One of the areas of use of high frequency high voltage electric fields is pre-sowing seed treatment, storage and processing. Experimental studies were conducted in the laboratory on a specially designed installation using a high-frequency high-voltage source. Processing doses have been established which make it practical to use a high-frequency, high-voltage electric field in electrotechnical winter wheat seed systems. Positive influence of high-frequency electric field on increase of sowing qualities and yielding properties of seeds is established. The optimal mode for determining the winter wheat field is the micro field, the mode is 16.8 kJ per 1 kg energy, the hour is 4 seconds, and the laboratory laboratory is 20% similar.

Pool-Frenkel effect and high frequency dielectric constant determination of semiconducting P2O5-Li2MoO4-Li2O and P2O5-Na2MoO4-Na2O bulk glasses

Open Physics ◽  
2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Dariush Souri ◽  
Mohammad Elahi ◽  
Mohammad Yazdanpanah
Keyword(s):  
Dielectric Constant ◽  
Electric Field ◽  
Electric Fields ◽  
Threshold Voltage ◽  
High Frequency ◽  
Strong Electric Field ◽  
Nonlinear Effects ◽  
High Frequency Dielectric Constant ◽  
Conduction State ◽  
Current Voltage

AbstractThe ternary 70P2O5-10Li2MoO4-20Li2O and 70P2O5-10Na2MoO4-20Na2O glasses, prepared by the press-melt quenching technique, were studied at temperatures between 298 and 418 K for their high dc electric field properties. For the above purpose, the effect of a strong electric field on the dc conduction of these amorphous bulk samples was investigated using the gap-type electrode configuration. At low electric fields, the current-voltage (I — V) characteristics have a linear shape, while at high electric fields (> 103 V/cm), bulk samples show nonlinear effects (nonohmic conduction). Current-voltage curves show increasing departure from Ohm’s law with increasing current density, leading to critical phenomena at a maximum voltage (threshold voltage), known as switching (switch from a low-conduction state to a higher-conduction state at threshold voltage). The Pool-Frenkel high-field effect was observed at electrical fields of about 103–104 V/cm; then the lowering factor of the potential barrier, the high frequency dielectric constant, and the refractive index of these glasses were determined.

scholarly journals High-frequency sonoelectrochemical processes: mass transport, thermal and surface effects induced by cavitation in a 500 kHz reactor

1999 ◽  
Vol 6 (4) ◽  
pp. 189-197 ◽  
Author(s):  
F.Javier Del Campo ◽  
B.A. Coles ◽  
F. Marken ◽  
R.G. Compton ◽  
E. Cordemans
Keyword(s):  
Mass Transport ◽  
High Frequency ◽  
Surface Effects

Stark Effect Investigations in the 5d 6s (3D) 6p 2D3/2-State of Li I

1977 ◽  
Vol 32 (7) ◽  
pp. 708-710
Author(s):  
H.-J. Eckert ◽  
H. Koch ◽  
P. Zimmermann
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Stark Effect ◽  
Theoretical Study ◽  
Level Crossing ◽  
Effect Parameter ◽  
Mixing States

Abstract The Stark effect of the 5d 6s (3D) 6p 2D3/2-state of Lu I was investigated using the level crossing technique in combined magnetic and electric fields. From the broadening of the Hanle signal due to the shifts of the crossings in the electric field the Stark effect parameter |β| - 6(2) kHz/(kV/cm)2 was deduced. A theoretical study considering some of the mixing states is made.

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