... The theory of AC conductivity for a weakly ionized gas is reviewed ... expression for the conductivity of a weakly ionized mixture of gases is formulated ...
DTIC Science & Technology
... SAMPLE AND AN AC MAGNETIC FIELD ... FREQUENCY, WHERE IMPEDANCE HERE IS ... THE RECONSTRUCTION METHOD ARE PRESENTED ...
... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...
In order to apply widely the superconductivity technology to electric power equipments, the development and evaluation on the AC superconducting cables have been conducted in the Central Research Institute of Electric Power Industry. The superconducting c...
National Technical Information Service (NTIS)
The phenomena of electrical conductivity and diffusion in plasmas is analyzed. Expressions are derived for the DC and AC conductivity of anisotropic plasma, as well as of an anisotropic magnetoplasma, using the macroscopic equations pertinent to the cold ...
... A piezoelectric material is formed from conductively anisotropic crystals by exposing the crystals to an AC electrical field, cold-pressing the crystals ...
... presaturated with the corrosion products. An AC impedance technique for the total electrical conductivity, the potentiostatic polarization method for ...
The ac and dc conductivities of single-crystal and polycrystalline NaCl were measured as a function of both temperature and particle size. The ac conductivity results for single-crystal NaCl agreed well with the literature. In the intrinsic range, however...
not be neglected. 1.2. Electrical conductivity measurement methodology The method of electrical conductivity study of electronic conduction. The method of electrical conductivity measurement con- ventionally used to probe the mechanism of ...
E-print Network
... Pagination or Media Count : 47. ... in a DC electric field, or ratio of odd harmonics in an AC electric field) of a weakly ionized gas (argon) are computed ...
The quantum transport theory of electronic conduction in the presence of a strong magnetic field is extended to the case of an applied alternating transverse electric field. The ac magnetoconductivity is calculated for a long-wavelength electric field, ta...
A single-chip integrated LED particularly adapted for direct use with a high voltage DC or AC power sources comprises a plurality of electrically isolated LEDs on a generally transparent substrate and bonded to electrically conductive elements on a therma...
The AC electrical conductivity of (Ag2O)x (Bi2O3)30 (B2O3)60?x (TeO2)10 glass (x=0, 2, 4, 5, 10, 15 and 20) were measured at different temperatures and frequencies. The results obtained indicated that glasses containing silver<5 mol% have values nearly approximately equal to AC electrical ...
NASA Astrophysics Data System (ADS)
Alternating current (AC) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform AC electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, AC-electroosmosis, and Brownian ...
measure the dynamical conductance of electrically contacted single-walled carbon nanotubes at dc and ac between the ac conductance and dc conductance. We also measure the microwave conductance of 2 nanotubes measured the dynamical ...
The electrical properties of alizarin doped anthraquinone were investigated using a complex impedance spectroscopy technique. Dielectric study revealed a phase transition from the semiconducting to the conducting state at 53�C. The dielectric relaxation was found to be of non-Debye type. Evidence of temperature-dependent electrical ...
We report the electrical relaxation in ion conducting Li4Nb1-xZn 2.5xP3O12. These glasses were prepared by conventional melt quenching method. The electrical relaxation has been investigated both in ac conductivity as well as electric modulus formalisms. The ...
The development of a new instrument is described and also techniques of measurement to determine; for fluids: (1) thermal conductivity, (2) dielectric constant, and hence (3) index of refraction, (4) electrical conductivity a.c., (5) electrical conductivi...
... 1 kHz) we observe onset of AC electro-osmosis (ACEO), which ... depends only on the temperature (T). For example, colloidal diffusion is determined ...
... hot corrosion processes at 1173 K. An AC impedance technique for the total electrical conductivity, the potentiostatic polarization method for ionic ...
... Abstract : The test was conducted to determine if flat conductor cable (FCC) could meet the electrical requirements of a 3 phase AC power feeder ...
ALl ceramic samples are in the form of multilayer capacitors or can be made in ... and electric field will be measured at 2 K, as will the ac conductivity. ...
NASA Website
Crystalline defects, their transport and interactions with impurities in potassium and rubidium azides have been studied by measuring the electrical conductivity with ac and dc techniques, the diffusion by a tracer sectioning technique and by the measurem...
Alternating current (ac) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform ac electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, ac-electroosmosis, and Brownian ...
PubMed
This paper presents a model to describe alternating current (AC) conductivity of DNA sequences, in which DNA is considered as a one-dimensional (1D) disordered system, and electrons transport via hopping between localized states. It finds that AC conductivity in DNA sequences increases as the frequency of the ...
The electrical conductivity of lithium borohydride (LiBH4) measured by the ac complex impedance method jumped by three orders of magnitude due to structural transition from orthorhombic to hexagonal at approximately 390 K. The hexagonal phase exhibited a high electrical conductivity of the ...
The flow rate of a conducting fluid in a stream is determined by disposing two permanent-magnet flowmeters in the stream, one downstream of the other. Flow of the conducting fluid causes the generation of both d-c and a-c electrical signals, the a-c comprising flow noise. Measurement of the ...
DOE Information Bridge
We report the study of electrical properties of some silver ion conducting molybdophosphate and borophosphate mixed network former glasses in a wide frequency and temperature range. The dc conductivity of the mixed network former glasses is higher than that of the single network former glasses. The ac ...
... Accession Number : AD0655046. Title : DETERMINING THE ELECTRIC PARAMETERS OF AC CONDUCTORS FOR AIRCRAFT,. ...
A FORTRAN subroutine for the calculation of the ac electrical conductivity in two-temperature, strongly coupled, overdense plasma is presented. The routine is the result of a model calculation based on classical transport theory with application to plasmas created by the interaction of short pulse lasers and solids. The formulation is ...
Energy Citations Database
The application of AC-electric fields, when integrated with current microarray and ``lab-on-chip'' platforms, has emerged as a useful tool to manipulate and assemble supramolecular aggregates, such as AC-field induced protein crystallization and DNA hybridization, yet the detailed mechanism remains unclear. To understand the ...
The electrical conductivity of double stranded DNA is investigated with ac impedance spectroscopy. Atomic force microscopy is used to provide images of the DNA molecules stretched over some gap electrodes through a flow cell. More stretched DNA molecules result in smaller charge-transfer resistances in the ac ...
A program was conducted to design and develop an advanced-concept motor specifically created for propulsion of electric vehicles with increased range, reduced energy consumption, and reduced life-cycle costs in comparison with conventional systems. The mo...
... I Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies by ... AC Impedance Analysis - ...
Expressions for the components of a nonlinear ac conductivity tensor have been derived - corresponding to a temperate, weakly ionized, lossy magnetoplsma. The electrical conductivity tensor is nonlinear because its components are functions of the isotropi...
The kinesin-microtubule system plays an important role in intracellular transport and is a model system for integrating biomotor-driven transport into microengineered devices. AC electrokinetics provides a novel tool for manipulating and organizing microtubules in solution, enabling new experimental geometries for investigating and controlling the interactions of microtubules ...
Impedance spectroscopy has been used to study the effect of kaolinite grain sizes on the AC electrical properties of kaolinite/polystyrene composites under different temperatures and applied frequencies. Impedance measurements were performed on prepared composites containing 20% kaolinite mineral of grain sizes 63, 106, 212, and 300 ?m in addition to neat ...
Space charge in polyethylene-based insulation materials and its effect on the local electric field under a dc environment have been extensively examined over the last few decades while the behavior of space charge under ac stress has received less attention. Space charge phenomenon under ac electric fields becomes ...
The effects of gigarad-level total absorbed doses from 1-MeV electrons on the post-irradiation alternating-current (ac) and direct-current (dc) electrical properties and the unpaired electron densities have been studied for Kapton, Ultem, and Mylar. The unpaired electron densities (determined from electron paramagnetic resonance spectroscopy) and the dc ...
The present work aims to study the effects of the blood-microstructure on the electrical conduction from two different but correlated properties: Electrical and mechanical (viscosity), and to derive useful parameters for the evaluation of electrical conduction as a function of the blood ...
PubMed Central
>The bremsstrahlung spectrum and the a-c electrical conductivity of a plasma are calculated, by classical methods, from a model in which the electrons interact with the plasma as a whole, and not with individual particles. The Fourier expansion of the particle density is employed for calculating the time dependent ...
Under the influence of an ac electric field, electrolytes on planar microelectrodes exhibit fluid flow. The nonuniform electric field generated by the electrodes interacts with the suspending fluid through a number of mechanisms, giving rise to body forces and fluid flow. This paper presents the detailed experimental measurements of ...
The patent describes a combination of elements for detecting leakage of electrically conductive fluids from tanks, including a reference electrode, an AC generator connected between the tank and the reference electrode, and one or more sensing electrodes positioned between the tank and the reference electrode. The storage tank and ...
Electrokinetic boundary conditions are derived for ac electrokinetic phenomena over leaky dielectric (i.e., semiconducting) surfaces. Such boundary conditions correlate the electric potentials across a semiconductor-electrolyte interface (consisting of an electric double layer inside the electrolyte solution and a space charge layer ...
An AC power-quality survey was conducted at four hospitals of differing bed sizes in the Midwest. This power-line survey concentrated on determining the ac power quality in three areas: ICU/CCU, radiology, and the clinical chemistry lab. A summary of three months of monitoring indicates very stable RMS voltage levels but the presence ...
The authors propose a method of measuring the ac electrical resistance with the use of an automatic compensator in the audible range of frequencies. This makes it possible to record the continuous relationships of electrical resistance to the temperature and time of conduct of the experiment used for investigation ...
... Title : THE USE OF AC FOR STRUCTURAL ANALYSIS OF FERROMAGNETIC MATERIAL BY THE ELECTRIC RESISTANCE METHOD. ...
... IS BASED ON AN AC METHOD KNOWN IN ... WHEN AC CURRENT FLOWS THROUGH THE SYSTEM, IT ... LAYER AND AN IMPEDANCE OF THE ...
In this paper we examine the motion and behavior of particles suspended in aqueous solutions subjected to non-uniform ac electric fields. The particles can move due to forces exerted over them, or due to the motion of the surrounding liquid. In the first case, we have dielectrophoresis, due the action of ac ...
A commercial bulk chalcogenide glass (Ge28Sb12Se60) was used as a source to fabricate amorphous thin films via thermal evaporation technique. At low frequencies (<1 MHz) impedance spectroscopy was performed to measure electrical properties. To measure ac conductivity at microwave frequencies, a split resonance cavity technique was ...
sample. The parameters used in the conductivity expression may have significant influence on the electricDC electric field distribution in planar dielectric in the presence of space charge Z. Xu * , W17 1BJ, United Kingdom * E-mail : zx04r@ecs.soton.ac.uk Abstract: Electric field in a ...
The bremsstrahlung spectrum and the a-c electrical conductivity of a plasma are calculated by classical methods, from a model in which the electrons interact with the plasma as a whole, and not with individual particles. The Fourier expansion of the parti cle density is employed for calculating the time dependent ...
The electrical behavior of diamondlike carbon (DLC) has been measured as a function of depth. The amorphous carbon (a-C) films are deposited by pulsed laser deposition using two complementary setups: a femtosecond (fs) and a nanosecond (ns) pulse lasers. It is demonstrated through four probe resistance measurements and contact resistance mapping that the ...
Polyaniline is chemically synthesised and doped with camphor sulphonic acid. FTIR studies carried out on these samples indicate that the aromatic rings are retained after polymerisation. The percentage of crystallinity for polyaniline doped with camphor sulphonic acid has been estimated from the X-ray diffraction studies and is around 56% with respect to polyaniline emeraldine base. The change in ...
The a-c electrical conductivity was measured for the systems CuI + CdI/sub 2/, CuCl + CdCl/sub 2/, CuI + KI, CuI + RbI, and CuCl + RbCl, and the results are discussed in relation to phase diagrams. New, highly conducting materials at room temperature were surveyed for the system, RbCl + CuCl. 4 figures, 5 tables.
Ionic conductivity for the chitosan-NH4CF3SO3 system was conducted over a wide range of frequency and at temperatures between 298 and 313 K. Dielectric data were analyzed using complex permittivity ?* and complex electrical modulus M* for the sample with the highest ionic conductivity at various temperatures. The ...
The ac electrical parameters of thermally evaporated zinc phthalocyanine, ZnPc, semiconducting thin films was measured in the temperature range of 180 390 K and frequency between 0.1 and 20 kHz. Aluminum electrode contacts were utilized to sandwich the organic ZnPc semiconducting films. Capacitance and loss tangent decreased rapidly with frequency at high ...
... Title : THERMOLUMINESCENCE INDUCED BY AC ELECTRIC FIELD IN ELECTROLUMINESCENT ZnS(Cu) SINGLE CRYSTALS,. ...
... Title : Superconducting Electric Machines for Ship Propulsion. ... superconducting AC machine concepts were ... MIT on superconducting AC machines. ...
