نتایج جستجو برای: surface impedance
تعداد نتایج: 667006 فیلتر نتایج به سال:
The interaction of DNA with quercetin was studied using scanning electrochemical microscopy and electrochemical impedance spectroscopy at glass carbon electrode. Information such as the surface coverage of the film and apparent rate constant of the redox active probe in solution was obtained. It is deduced that quercetin interacting with DNA forms a kind of electrochemical inactive supramolecul...
A general analytical model is developed for the scattering of sound by a sphere with a nonuniform impedance boundary condition that is divided into two uniformly distributed hemispheres. In addition to the overall solution for the time harmonic pressure, the analytical result gives insight into the modal contributions and coupling for different cases of source incidence and boundary impedance. ...
A problem of the spherical antenna consisting of a thin radial monopole located on a perfectly conducting sphere is solved. The antenna is excited at the base by a voltage δ-generator. An approximate analytical solution of the integral equation for the current on a thin impedance vibrator was found by the method of successive iterations. The solution is physically correct for arbitrary dimensio...
To decrease the impedance of microelectrode arrays, for neuroscience applications we have fabricated and tested MEA based on multi-walled carbon nanotubes. With decreasing physical size of a microelectrode, its impedance increases and charge-transfer capability decreases. To decrease the impedance, the effective surface area of the electrode must generally be increased. We explored the effect o...
Natural grounds can exhibit small geometry irregularities, compared to the wavelength, which are called surface roughness. Using effective impedance is a useful way to model the effects of surface roughness on outdoor sound propagation, particularly in numerical methods as it avoids the meshing of small irregularities. In this paper, firstly an effective impedance model taking into account the ...
The authors suggest the generalized method of induced electromotive forces (EMF) for the investigation of the characteristics of single and systems of thin impedance vibrators at their arbitrary excitation and distribution of the surface impedance on the ground of the made analysis in the proposed paper. The distinctive peculiarity of this method is the use of the functional distributions, obta...
The present paper describes a capacitive feed (C-feed) for small, low-profile linear antennas. A meander line, which is the radiating element, in such antennas with a metallic back conductor electromagnetically couples a metallic feed plate placed between the meander line and the back metal (ground). This antenna has a very small leakage current on the outer surface of the coaxial cable and can...
Electrical impedance tomography (EIT) is a noninvasive type of medical imaging in which the electrical conductivity, permittivity, and impedance of a part of the body is inferred from surface electrode measurements and used to form a tomographic image of that part. Electrical conductivity varies considerably among various biological tissues (absolute EIT) or the movement of fluids and gases wit...
This paper has presented the characteristic impedance and signal propagation delay time for both surface and embedded microstrip lines that comprise a conducting strip line with width w, thickness t of conductivity σ, on a substrate of thickness h, relative permittivity εr, relative permeability sub, on top of an infinite grounded electrode. The strips couples to the ground plane. It is observ...
Dielectric impedance spectroscopy in a microchip was used for monitoring the adsorption of biomolecules onto a heterogeneous polymer surface obtained after the photoablation process. The sensor comprises a thin dielectric layer with two parallel carbon microband electrodes on the one side, and the photoablated surface on the other. The biomolecules need not to be labelled, as in an optical bios...
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