Results 221 to 230 of about 57,156 (257)

Electric field measurements and computational modeling at ultrahigh-field MRI

Magnetic Resonance Imaging, 2007
While magnetic resonance images essentially contain a map of the both circularly polarized components of the RF transverse magnetic fields (B(1) field), the thermal heat and electromagnetic power deposition is generated by the associated electric fields.
Alayar, Kangarlu, Lin, Tang, Tamer S, Ibrahim   +2 more
openaire   +2 more sources

Second-order model of membrane electric field induced by alternating external electric fields

IEEE Transactions on Biomedical Engineering, 2000
With biological cells exposed to ac electric fields below 100 kHz, external field is amplified in the cell membrane by a factor of several thousands (low-frequency plateau), while above 100 kHz, this amplification gradually decreases with frequency. Below 10 MHz, this situation is well described by the established first-order theory which treats the ...
Tadej Kotnik, Damijan Miklavcic
openaire   +2 more sources

Model electrical activity of neuron under electric field

Nonlinear Dynamics, 2018
Continuous pump and transmission of charges such as calcium, potassium, sodium in the cell can induce time-varying electromagnetic field, and the induced electric field can further modulate the propagation of ions in the cell. Based on the physical laws of static electric field, the effect of electric field in isolate neuron is investigated by ...
Jun Ma, Ge Zhang, Tasawar Hayat, Guodong Ren   +3 more
openaire   +1 more source

Particle Trajectories in a Model Electric Field II,

1981
Abstract : The report examines the feasibility of neutralizing the potential difference that occurs on a spacecraft by emitting ions from the positively charged surface region of the spacecraft and lefting this current impact on the negatively charged surface region.
Paul Carini, Gabor Kalman, Yaakov Shima
openaire   +1 more source

Electric field investigations and a model for electrical liquid spraying

Journal of Colloid and Interface Science, 1968
Abstract The equation generally used for determining the electric field at the liquid tip in electrical spraying of liquids was originally derived for determining the electric field around a metal tip in the extraction of electrons from metals. In the present paper experimental data were taken at the instant of spraying to determine the validity of ...
Wallace E. DeShon, Ralph S. Carson
openaire   +1 more source

An Analytical Model for the Electric Field of an Wedge Field Emitter

2006 19th International Vacuum Nanoelectronics Conference, 2006
The two-dimensional electric potential and electric field distribution for typical model field emitter structures in the closed analytical form are obtained. The electric field in a cathode cell with a wedge field emitter is determined. Models for a single emitter diode structure, for a periodic diode structure and for a triode-like structure are ...
V. A. Fedirko, V. V. Guziy
openaire   +1 more source

Modeling assemblies of biological cells exposed to electric fields

IEEE Transactions on Biomedical Engineering, 1998
Gap junctions are channels through the cell membrane that electrically connect the interiors of neighboring cells. Most cells are connected by gap junctions, and gaps play an important role in local intercellular communication by allowing for the exchange of certain substances between cells.
Elise C. Fear, Maria A. Stuchly
openaire   +2 more sources

Modelling of the Cardiac Electrical Field

1993
WALLER, in 1889, was the first to record the electrical activity of the human heart with the capillary electrometer constructed by LIPPMANN. From 10 to 20 electrocardiograms recorded on a human chest, he established a crude body potential map. He observed that the potential distribution is analogous to that given by a single dipole with an orientation ...
openaire   +1 more source

Modelling of the electric field in HVDC cables

5th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service. TELSIKS 2001. Proceedings of Papers (Cat. No.01EX517), 2002
The scope of this paper is to present some aspects in modeling of electrical field in high-voltage direct-current (HVDC) cables. Some computation models for electrical fields are presented. Computation procedures are developed for DC cables with one and two imperfect dielectric insulation layers for capacitive and resistive field distribution.
D. Carstea, I. Carstea
openaire   +1 more source

The electric field model of the earth's magnetotail

Chinese Astronomy and Astrophysics, 2003
Abstract The electric field in the Earth's magnetosphere is the main driving force of plasma motion there. The magnetospheric electric field is now generally taken to be a uniform dawn-dusk field or a projected field. In this work it is assumed that magnetic field lines are the equipotential lines of electric field, and that the electric field of the
null Zhang Tian-hui, null Xu Rong-lan, null Li Lei   +2 more
openaire   +1 more source