... I Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies by ... AC Impedance Analysis - ...

... REPORTED. THE BACKGROUND AND VARIOUS METHODS OF ANALYSIS OF AC IMPEDANCE DATA ARE DISCUSSED. THE ...

... Abstract : Experimental approaches for recording ac impedance data are ... Additional methods for analysis of experimental impedance data are ...

... Title : AC Impedance Analysis of Corrosion Fatigue in Naval Aircraft Alloys. ... this program is to develop rapid electrochemical methods for evaluating ...

... Abstract : Electrochemical techniques for predicting stress corrosion cracking (SCC ... potentials with continuous recording of the ac impedance in a ...

... OF INFLUENCING PARAMETERS BY IMPEDANCE PLANE ANALYSIS ... AC MAGNETOGRAPHY ... A SERIES OF TEST METHODS INTEGRATED IN A ...

... Title : AC IMPEDANCE MEASUREMENT OF ENVIRONMENTAL ... OF INTERFACIAL IMPEDANCE MEASUREMENT ARE ... OF THE METHOD IN ...

A least-squares fitting routine has been developed for the analysis of ac impedance data. It has been determined that the checking of the derived equations for a particular circuit with a commercially available electronics circuit program is essential. As...

... ionic conductivity and compressive modulus were measured by AC impedance and compression respectively. Dynamic Mechanical Analysis was ...

... involves the application of a variety of pulses and ac methods with the intention of assigning an aperiodic circuit from electrode impedance analysis ...

... involves the application of a variety of pulse and ac methods with the intention of assigning a periodic circuit from electrode impedance analysis. ...

... BY DC AN AC ELECTROCHEMICAL TECHNIQUES AS COMPARED ... IMPEDANCE DIAGRAMS SHOW THAT A SLIGHTLY ...

Experimental approaches for recording ac impedance data are discussed in this paper. Considerations of the high frequency performance of potentiostats and reference electrodes are given and experimental results are presented. Additional methods for analysis of experimental impedance data are discussed, with ...

Ac impedance spectroscopy has been used to measure the dynamic response of two types of porous gas-diffusion oxygen electrodes in a sulfuric acid electrolyte. Models were developed based on flooded and on thin-film pore structure. The transfer functions of these structures were calculated and the impedance result fitted to the models ...

... From the impedance locis, we obtain resonant frequencies. ... 3. KK Mei, AC Cangellaris, and D. J. Angelakos ... Difference Method," Radio Science, Vol. ...

... The mechanism for Cu to retard SCC has been investigated by using macro cell method, AC impedance method and ESCA analysis. ...

... We will summarize here the basic equations of this method of analysis, which ... Z at any plane along the beam can be called the ac impedance of the ...

The investigation of the mechanism of anodic hydrocarbon oxidation involves the application of a variety of pulses and ac methods with the intention of assigning an aperiodic circuit from electrode impedance analysis. The applicability of techniques and m...

The investigation of the mechanism of anodic hydrocarbon oxidation involves the application of a variety of pulse and ac methods with the intention of assigning a periodic circuit from electrode impedance analysis. The applicability of techniques and meth...

... zinc phosphate coatings on steel surfaces with different pretreatment have been studied with preliminary analysis using ac impedance techniques. ...

... Title : APPLYING AC IMPEDANCE ELECTROCHEMICAL METHODS TO CORROSION TESTING COBALT ALLOY MEDIA. Corporate Author : ...

In this study, we have investigated the properties of discontinuous-Co80Fe20/?-Fe2O3 multilayers by AC impedance technology. The specific feature of the impedance spectra varies with of Co80Fe20 layer characteristics, being related to isolated sate or percolation state of Co80Fe20 cluster in ?-Fe2O3 matrix. The equivalent-circuit ...

... Title : A Corrosion Monitor Based on Impedance Method,. ... were performed on the impedance characteristics of ... the aid of a new ac corrosion monitor. ...

... IS BASED ON AN AC METHOD KNOWN IN ... WHEN AC CURRENT FLOWS THROUGH THE SYSTEM, IT ... LAYER AND AN IMPEDANCE OF THE ...

... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...

The AC impedance spectra of thin polypyrrole films were obtained at open circuit potentials from -0.4 to 0.4 V vs SCE. Two limiting cases are discussed for which simplified equivalent circuits are applicable. At very positive potentials, the predominantly...

This report described the possible application of ac impedance analysis for diagnosis of cell capacity degradation of AA size Li/MoO2 secondary cells. Electronic internal resistivity (R(sub s)), interfacial resistivity between lithium negative electrode a...

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric signals. Three ac ...

Polyaniline (PANI) membranes symmetrically bathed by electrolyte solutions on both faces have been studied by ac impedance. The membrane impedance is very sensitive to both solution pH and membrane potential, being lower under the conditions for which PANI is an electronic conductor: it increases by several orders of magnitude when pH ...

In substituting a degree of imbalance between the phase impedances of hvdc converter transformers for the usual assumption of equal impedances, the generated ac harmonics are modified and triplen (non-characteristic) harmonics are produced. They are analysed and assessed and are not expected to be serious provided due attention is paid ...

... TR-2004(8555)-2 AC Impedance Testing on 40-Ah Li-Ion Cells 20 October 2004 ... AC Impedance Testing on 40-Ah Li-on Cells 5b. GRANT NUMBER ...

... E-mail: * mtaguchi@net.nagasaki-u.ac.jp ... of moment, Micro-Stripes based on TLM method. Its input impedance characteristics are compared with ...

... of a Scanning Electrochemical Impedance Spectroscopy Technique ... This article describes a method of generating ... by driving an ac current between ...

... and DC electrochemical techniques have verified that the low-frequency impedance spectrum obtained from the AC Impedance technique is ...

... and DC electrochemical techniques, have verified that the low-frequency impedance spectrum obtained from the AC Impedance technique is ...

... Methods of obtaining the complete negative resistance ... amplifier load impedance effects the input impedance. ... be evaluated at the ac frequencies of ...

... was examined by applying the methods described below. ... Electrochemical Measurements: Alternating current (AC) impedance measurements were ...

... inhibition was studied using impedance spectroscopy and potentiodynamic methods. Results obtained from the AC impedance measurements are ...

... Abstract : Two in situ techniques, dynamic imaging ... LEIS is an electrochemical impedance technique that generates local ac impedance data by ...

... of the ac impedance at a metal-electrolyte interface as a function of frequency are depicted, and recently developed measurement techniques are ...

... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...

... electrochemistry of titanium in the LiCl-KCl eutectic melt has been investigated by means of pulse techniques and ac impedance measurements. ...

... Accession Number : ADD854901. Title : Inductance Effect in the AC Impedance of Conducting Polypyrrole Films. Descriptive Note : Journal article,. ...

... TECHNICAL REPORT NATICK/TR-93/019 AD ALTERNATING CURRENT (AC) IMPEDANCE TESTING OF COATED TRAYCANS By Kurt Lawson ...

... Accession Number : ADA261256. Title : Alternating Current (AC) Impedance Testing of Coated Traycans. Descriptive Note : Final rept. ...

... Title : Ac Impedance Investigation of Ta2O5 Film for Use as a Storage Capacitor Dielectric. Descriptive Note : Journal article,. ...

... Abstract : Although ac impedance has come to prominence lately for studying anti ... At first sight this is surprising since the techniques are very ...

... Accession Number : ADA428218. Title : AC Impedance Testing on 40-Ah Li-Ion Cells. Descriptive Note : Technical rept. ...

... Accession Number : ADD854551. Title : AC Impedance Method for High-Resistivity Measurements of Silicon. Descriptive Note : Journal article,. ...

... Title : AC IMPEDANCE INVESTIGATION OF TA(2)O(5) FILM FOR USE AS A STORAGE CAPACITOR DIELECTRIC. Corporate Author : ...

Flow-through porous electrodes, such as packed-bed and fluidized-bed electrodes, are attractive for electrowinning, electro-organic synthesis and flow-battery applications. The extensive surface area of the porous electrodes makes high volumetric reaction rate more possible than in a cell with smooth electrodes. Forced convection also enhances mass-transfer rate and hence reduces concentration ...

... in the AC Response of an ... LEAST SQUARES METHOD, CHARGE TRANSFER ... COEFFICIENT, EQUATIONS, IMPEDANCE, BINARY COMPOUNDS. ...

... Title : Measurement of Low Corrosion Rates: Comparison of ac Impedance and Thin Layer Activation Methods,. Corporate Author : ...

... Assisted DC and AC Techniques in Electrochemical ... data acquisition and calculation method, allows the ... Impedance measurements give the same ...

A and B site modified new bismuth layered structure ferroelectric ceramics of the Aurivillius family were prepared by the solid-state route. Impedance measurements were performed on these samples to understand the relaxation effects in the frequency range of 100 Hz to 1 MHz. From the detailed impedance and modulus spectroscopic ...

This paper reports on a local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the working and reference ...

... jUN 0 91994D * F ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF ... 16. PRICE COOE ac-Impedance, Chromate, Aluminum Alloys 17. ...

For research and development of the solid oxide fuel cell (SOFC), it is very important to develop diagnostic tools that can grasp detailed cell performance characteristics. The a.c. impedance analysis is one of the indispensable methods for this purpose. The authors, therefore, perform time-dependent numerical simulations for a planar ...

In-situ measurement of corrosion rate of Zircaloy-4 was tested by applying AC-impedance method in 300degC water in a static autoclave. Impedance data of surface oxide layer of sample were obtained by the Frequency Response Analysis Method and converted in...

This report describes the possible application of ac impedance analysis for diagnosis of cell capacity degradation of AA size Li/MoS2 secondary cells. Electronic internal resistivity R(sub s), the interfacial resistivity between the lithium negative electrode and the electrolyte R(sub n), and the constant parameter of Werburg ...

This paper introduces a simple portable dual analyzer which allows real-time ac-impedance measurements and noise spectroscopic analysis simultaneously, employing one or two data acquisition systems together with a low noise current-to-voltage preamplifier. The input signal composed of numerous selected frequencies of sinusoidal voltages with a dc bias was ...

... SAMPLE AND AN AC MAGNETIC FIELD ... FREQUENCY, WHERE IMPEDANCE HERE IS ... THE RECONSTRUCTION METHOD ARE PRESENTED ...

... METHODS DISCUSSED INCLUDE POSITRON ANNIHILATION, AC- IMPEDANCE SCANNING, SCANNING LASER ACOUSTIC MICROSCOPY ...

... EVALUATION OF THE STATE OF CHARGE OF BATTERY ELECTRODES WITH AC IMPEDANCE TECHNIQUES Principal Investigator: Prof. ...

... CORROSION, CORROSION FATIGUE, AND STRESS CORROSION CRACKING) TO THE USE OF AC IMPEDANCE TECHNIQUES AND A ...

... DC AND AC TECHNIQUES WHICH CAN ... THE EXTRAPOLATION METHOD OF TAFEL ... MEASUREMENTS AND IMPEDANCE MEASUREMENTS ...

... APPLICATION OF COLLOCATION METHODS REDUCES THE ... CRACK IN THE AC FIELD OF A ... AS WELL AS THE IMPEDANCE CHANGES DUE ...

Electrochemical corrosion testing using AC impedance measurement and ellipsometry has been performed on aircraft aluminum 2024-T3 samples. The AC Impedance technique was used to acquire a precise low-frequency impedance signature of corroding painted airc...

The AC-impedance technique was experimentally evaluated as one of the in-situ measuring means to determine the corrosion rate of metals immersed in aqueous solutions. Surface impedance of corroding metals was measured by both the FET and FRA methods using...

... Title : OCM and Impedance Analysis of Polypyrrole. Descriptive ... region). Keywords: Polymer, Impedance polypyrrole, Insertion electrode. ...

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric signals. Three ac ...

During the spring of 1991, several severe geomagnetic disturbances were recorded in North America, and particularly in Northern Quebec, where Hydro-Quebec's La Grande generation complex and transmission system are located. As a result of these disturbances, the Quebec-New England Phase 2 HVDC system was affected by transformer saturation and harmonic voltage distortion due to geomagnetic ...

Lanthanum fluoride nanoparticles have been synthesized by the simple method of direct precipitation from an aqueous solution. TG/DTA analysis confirms the sample formation at low temperature (300 �C). Structure of LaF3 nanoparticles has been analyzed by XRD and LaF3 is found to be in tysonite structure. From the XRD spectra the average particle size is found to be 15 nm ...

The equivalent circuit parameters for a pentacene organic field-effect transistor are determined from low frequency impedance measurements in the dark as well as under light illumination. The source-drain channel impedance parameters are obtained from Bode plot analysis and the deviations at low frequency are mainly due to the contact ...

In the present study the tool of impedance spectroscopy was utilized to characterize dielectric behavior of ferroelectromagnetic ceramics of Bi9Fe5Ti3O27 composition fabricated by hot pressing method from the stoichiometric mixture of oxides Bi2O3, TiO2 and Fe2O3. Impedance spectroscopy was applied to characterize relaxation processes present in the system ...

Impedance spectroscopy is often used to analyse the electrical properties of ceramic materials having high-resistive grain boundaries, such as ZnO and SrTiO{sub 3}. Fewer attempts have been made at using this technique for the analysis of inhomogeneous electronic ceramics consisting of grains with differing composition, such as those occurring in negative ...

A comprehensive study has been undertaken to investigate the ability of AC-impedance spectroscopy (AC-IS) to non-destructively monitor the fiber dispersion of conductive fiber-reinforced cement-based materials. Previous work showed that AC-IS effectively monitors various fiber dispersion issues in lab-scale steel fiber-reinforced ...

BaBiO3-doped BaTiO3 (BB�BT) ceramic, as a candidate for lead-free positive temperature coefficient of resistivity (PTCR) materials with a higher Curie temperature, has been synthesized in air by a conventional sintering technique. The temperature dependence of resistivity shows that the phase transition of the PTC thermistor ceramic occurs at the Curie temperature, Tc = 155 �C, which is higher ...

The impedance spectrum test was employed for detection of short circuits within Wendelstein 7-X (W7-X) superconducting magnetic field coils. This test is based on measuring the complex impedance over several decades of frequency. The results are compared to predictions of appropriate electrical equivalent circuits of coils in different production states or ...

A methodology for detecting and locating defects or discontinuities on the outside covering of coated metal underground pipelines subjected to cathodic protection has been addressed. On the basis of wide range AC impedance signals for various frequencies applied to a steel-coated pipeline system and by measuring its corresponding transfer function under ...

A scanning electrochemical microscope (SECM) in ac mode is used for the characterisation of the adsorption process during the hydrogen evolution reaction (HER) in sulfuric acid solution. It is shown that this technique allows quantitative analysis of the adsorption process, and measurements of the differential capacitance with the frequency as parameter ...

... ORiGNATIN- AC tIVITy (, po*e -Ithot) 2 I ... between tidal volume and thoracic impedance was determined by analog and digital methods. ...

Jan 22, 2011 ... Abstract: This paper discusses a task the objective of which is to characterize solar cell array AC impedance and develop scaling rules for ...

This paper investigates the scattering from impedance strips and impedance-loaded conducting strips. The impedance strips are analyzed using Senior's impedance half plane formulation. Once the primary diffraction from the impedance half plane is presented...

... frequency dispersion of the impedance is observed ... A method of estimating the true specific ... at gold/solution interface, ac admittance techniques ...

... ACOUSTIC IMPEDANCE, ELECTRICAL LOADS, PIEZOELECTRIC TRANSDUCERS, HARMONIC ANALYSIS, MECHANICAL IMPEDANCE. ...

... FREQUENCY RESPONSE, ACOUSTIC IMPEDANCE, PIEZOELECTRIC TRANSDUCERS, HARMONIC ANALYSIS, MECHANICAL IMPEDANCE. ...

... Title : RECENT ADVANCES IN MECHANICAL IMPEDANCE ANALYSIS INSTRUMENTATION FOR THE EVALUATION OF ADHESIVE BONDED ...

The frequency behaviour of the electrical properties of field-aligned CrO2 needle-shape powders has been investigated by the impedance spectroscopy method. The low frequencies R(f) increase with increasing ?, the angles between the applied current direction and the easy axis of the aligned samples. The specific frequency, of which a maximum -X(f) occurred, is varied towards ...

The ac impedance of the interface between a blocking electrode and an aqueous or solid electrolyte often contains a constant-phase-angle (CPA) element whose impedance has the frequency dependence given by Z( omega ) proportional to (j omega ) sup - /sup e...

Infrared spectroscopy is used to characterize the molecular structure and orientation of acetonitrile adsorbed at the Au/aqueous solution interface. AC impedance measurements are used to determine the stoichiometry and energetics of the adsorption process...

To investigate metal surface corrosion and the breakdown of metal protective coatings, the ac Impedance Method was applied to zinc chromate primer coated 2219-T87 aluminum. The EG&GPARC Model 368 ac Impedance Measurement System, along with dc measurements...

The small signal ac impedance of the interface between a blocking electrode and an aqueous or solid electrolyte often contains a constant-phase-angle (CPA) element whose impedance has the frequency dependence according to Z proportional to (j omega )/sup ...

Single phase perovskite Ba(Sr1/3Nb2/3)O3 ceramics was prepared using the columbite precursor method. X-ray diffraction (XRD) technique is used to verify the single phase formation. It stabilizes in hexagonal phase with lattice constants a=12.1243 � and c=15.3747 �. Impedance analysis shows distributed relaxation time. Single semicircular arc observed ...

The AC impedance spectra of thin polypyrrole films were obtained at open circuit potentials from -0.4 to 0.4 V vs SCE. Two limiting cases are discussed for which simplified equivalent circuits are applicable. At very positive potentials, the predominantly nonfaradaic AC impedance of polypyrrole is very similar to ...

Complex impedance spectroscopic studies were carried out on RbNO3 and RbNO3 Al2O3 dispersed solid electrolyte systems (DSES) in the temperature range of 50 �C to 300 �C and the frequency 50 KHz to 1 MHz. Dielectric constant, loss tangent, and AC conductivity, in these systems are presented. Dielectric constant, loss and AC ...

Solar. Subsystems. FIGURE 1. Model Spacecraft With Subsystems. Although the .... minimum ac impedance between each circuit common and chassis. ...

... integrals allows the discussion of a wide range of electrochemical techniques and in this paper we discuss the derivation of the AC impedance of a ...

... AC detection and a complex RC feedback impedance is provided to give the detecting circuit an output proportional to the energy content of an ...

... the techniques being developed or investigated are NDT methods which include electrochemical (linear polarization, ac impedance, and small ...

... The primary advantage of the method lies in the fact that a non ... Because of this, the ac impedance depends on frequency but not on the dc voltage ...

... THE PROBLEM OF THE AC MAGNETIC FIELD ... A LOWER DIMENSION, THE SECOND METHOD FITS BETTER ... OF THE TOTAL IMPEDANCE OF A ...

... Using the method of singular perturbations I ... Implementation of an Impedance Boundary Condition ... of Engineering Mathematics, ac- cepted, August ...

A microfabricated instrument for detecting and identifying cells and other particles based on alternating current (AC) impedance measurements. The microfabricated AC impedance sensor includes two critical elements: 1) a microfluidic chip, preferably of glass substrates, having at least one microchannel therein and ...

... In accordance with one method of this invention ... analog voltage which represents the AC component that is phase shifted by the impedance of the ...

... Title : Measurement of Battery Separator Resistances in Low Impedance Conductivity Cells by AC Bridge Techniques. ...

... presaturated with the corrosion products. An AC impedance technique for the total electrical conductivity, the potentiostatic polarization method for ...

It has been observed that ac impedance measurements made over a wide frequency range can be used to determine the electrical properties of photovoltaic solar cells. The occurrence of a distribution of time constants for an array of cells indicates that one or more cells deviate significantly from the values of cells which operate properly. In some cases, ...

... There are two electrochemical methods that are commonly used to monitor the corrosion behaviour of materials: DC Potential and AC Impedance. ...

... This study is part of a general development of the ac-impedance method for measurement of the properties of coated metals. (Author). ...

... L in hydrazine have also been measured by several electrochemical techniques such as Tafel plots, polarization resistance, and AC Impedance. ...

... Descriptors : *POLYMERIC FILMS, *PYRROLES, *CAPACITANCE, *THIN FILMS, ALTERNATING CURRENT, MICROSCOPY, HIGH ENERGY ...

... This requirement vas ac- ... third aspect is the change in impedance, and especially the ... efficiency of buried antennas by theoretical methods has been ...

... systems was necessary. In addition, ways for obtaining corrosion rates from AC impedance methods were investigated. ...

... Title : ANODIC CHARACTERISTICS OF Ni RICH ALLOYS MEASURED BY THE AC IMPEDANCE METHOD,. Corporate Author : ...

... rectifying the AC voltage signals generated by the ... and a source impedance 91 represent the ... Disclosed Method" section, of a transmission line ...

Recently, the authors have proposed a method for generating local electrochemical impedance maps of electrodes. In this technique impedance maps, at each frequency of interest, are generated by measuring the ratio of ac solution current density, very near...

Performance of lithium-ion batteries at low temperatures and/or high rates is relatively poor due to high cell internal impedance. The ac impedance spectroscopy was utilized to determine the impedance characteristics of lithium- ion cells as a function of...

Jan 22, 2011 ... dc.subject.other, solar cells solar arrays AC impedance Mars ... dc.title, ( abstract) Scaling Nominal Solar Cell Impedances for Array Design ...

AC-impedance measurements have been used for a number of years for laboratory screening of chemical corrosion and scale inhibitors and assessment of other chemicals for use in oil flowlines. In this paper the viability of using the AC-impedance technique as a field tool where the corrosion performance is measured in the production fluids and not under ...

In an effort to investigate metal surface corrosion and the breakdown of metal protective coatings the AC Impedance Method was applied to zinc chromate primer coated 2219-T87 aluminum. The model 368-1 AC Impedance Measurement System recently acquired by t...

... Title : THE USE OF AC FOR STRUCTURAL ANALYSIS OF FERROMAGNETIC MATERIAL BY THE ELECTRIC RESISTANCE METHOD. ...

AC impedance has provided a useful diagnostic tool in the Los Alamos polymer electrolyte fuel cell (PEFC) program. The author reviews the techniques he has used in ac impedance modeling. These techniques include equation implementation, model simplification and verification, least squares fitting, application of ...

Complex impedance analysis of a new rare earth-based ceramic oxide, LaLiMo2O8, prepared by a standard solid-state reaction technique has been carried out. Material formation under the reported conditions has been confirmed by X- ray diffraction studies. A preliminary structural analysis indicates the crystal structure to be ...

Contents: Nondestructive Evaluation of Plasma Sprayed Coating; Characteristics of Excimer Laser-induced Iron Plasma -- Fundamental Research of Materials Processing by Excimer Laser (Report 1); AC Impedance Analysis for Li(sup +) Insertion of a Pt/lambda-M...

Improved methods are needed to characterize ac system harmonic behavior for ac filter design for HVDC systems. The purpose of this General Electric Company RP1138 research is to evaluate the present filter design practice and to investigate methods for calculating system harmonic impedances. An overview of ac ...

point that is relatively insensitive to the transistor beta. By adding AC bypass capacitors as an AC short circuit at high enough frequency. What is the magnitude of the impedance of a l0�F capacitor the bypass capacitor). Measure the AC output signal. Comment. Estimate the output resistance of the CE

AC four-point impedance spectroscopy has been applied to Nb-doped SrTiO{sub 3} bicrystals. Due to the simplified geometry and highly conductive bulk of the bicrystal, the reference impedance of the electrode was significantly reduced, validating the applicability of ac four-point impedance ...

This paper introduces a simple portable dual analyzer which allows real-time ac-impedance measurements and noise spectroscopic analysis simultaneously, employing one or two data acquisition systems together with a low noise current-to-voltage preamplifier. The input signal composed of numerous selected frequencies of sinusoidal voltages with a dc bias was ...

... Accession Number : ADD302398. Title : MECHANICAL IMPEDANCE ALGORITHM ANALYSIS OF TAPER-LOK BOLTED JOINTS. Corporate Author : ...

... Accession Number : ADD314753. Title : EDDY CURRENT IMPEDANCE PLANE ANALYSIS. Corporate Author : Personal ...

... Accession Number : AD0632075. Title : ANALYSIS OF ACOUSTIC IMPEDANCE DATA. Descriptive Note : Research rept. ...

... The solution is to use bioelectrical impedance analysis. ... model of bioelectrical impedance analysis demonstrated the potential disparity between the ...

An analysis of two-dimensional scattering from a narrow groove in an impedance plane is presented. The groove is represented by a impedance surface and the problem reduces to that of scattering from an impedance strip in an otherwise uniform impedance pla...

The beam-cavity coupling impedance is formulated in terms of the normal modes of the cavity. While the analysis is carried out only for the longitudinal beam-cavity coupling impedance, it should be easily adapted to the transverse impedance. The hope is that such a formulation may illuminate the behavior of the ...

Property enhancement in composites depends largely on the reinforcement. For fiber-reinforced composites, the distribution of fibers is crucial in determining the electrical and mechanical performance. Image analysis methods for characterization can be time-consuming and/or destructive. This work explores the capability of AC-impedance spectroscopy ...

This website includes an explanation of impedance in AC circuits, along with an applet that draws graphs and phasor diagrams for some important variables in the circuit. The explanation of impedance gives formulas for reactance, impedance and resonance, and explains the importance of resonance. The applet allows ...

Consumers Power Co. coupled field-test data with results of an IIT Research Institute study on powerline-pipeline interaction to characterize a pipeline's reaction to alternating current. An analysis of impedance relationships revealed that values of a-c pipe resistance for wall thicknesses over 0.188 in. (48 mm) vary in ...

The intent of this work is to develop AC impedance measurements, in combination with other methods, as a tool to determine the relative importance of various resistance sources in the multi-step process occurring at a gas-diffusion porous electrode. In particular, the case of a MCFC cathode is studied. The goals of this study are: (1) elucidation of ...

(Pb0.97Sr0.03)(Zr0.05Ti0.95)O3 nanocrystalline powder was prepared by a solution based chemical method. Preliminary x-ray diffractogram analysis of some aspects of crystal structure showed that a single-phase compound was formed exhibiting a tetragonal system. Impedance spectroscopy study showed the presence of both bulk and grain boundary effects in the ...

The electrical properties of alizarin, a ?-conjugated organic semiconductor, were investigated by the complex impedance spectroscopy technique. A transition from semiconducting to conducting state has been observed and the transition temperature shifts to higher side with the increment in frequency. The dielectric relaxation was found to be of non-Debye type (polydispersive). ...

Humidity sensing characteristics of NiO/Al2O3 nanocomposites, prepared by sol-gel method, are studied by impedance spectroscopy. Modeling of the obtained impedance spectra with an appropriate equivalent circuit enables us to separate the electrical responses of the tightly bound chemisorbed water molecules on the grain surfaces and the loosely associated ...

To monitor the real-time corrosion behavior of solar thermal heat exchangers with aqueous thermal transfer media, one seeks an in situ method based on the electrochemical nature of the corroding metal interface. Present methods using DC polarization do not account for changes in solution conductivity brought about by diurnal cycling or the capacitive nature of either the electrochemical interface ...

Summary Summary Summary * Ac Ac Ac Acc c c curate performance analysis of trough plants with urate performance analysis of trough plants with urate performance analysis of...

Improved methods are needed to characterize ac system harmonic behavior for ac filter design for HVDC systems. The purpose of this General Electric Company RP1138 research is to evaluate the present filter design practice and to investigate methods for calculating system harmonic impedances. An overview of ac ...

The author attended the First International Symposium on Electrochemical Impedance Spectroscopy and presented an invited lecture on the theory of ac impedance of rough electrode-electrolyte interfaces. After the symposium the author spent four days at Ecole Polytechnique, Palaiseau, on the outskirt of Paris to give an invited talk and ...

Improved methods are needed to characterize ac system harmonic behavior for ac filter design for HVDC systems. The filter design practice is evaluated and methods for calculating system harmonic impedances are investigated. An overview of ac filter design for HVDC systems and a survey of literature related to ...

The problem of the weak back-to-back HVDC link is investigated by quasi-steady-state analysis and small perturbation linearized stability analysis. The large ac line impedances on either sides of the HVDC link present severe constraints so that there may be no feasible steady-state solutions unless ..cap alpha.. ...

The power supply design of the {gamma}{sub f} - jump system in FNAL Main Injector uses a resonant circuit. A critical design parameter is the ac losses of the beam tube in a pulsed quadrupole. This paper gives an analysis to this problem. An equivalent circuit model based on the impedance measurement was established. The measured and ...

The electrical properties of CdTe/CdS solar cells grown by metal organic chemical vapor deposition were investigated by a technique of impedance measurements under varied intensity of AM1.5 illumination. A generalized impedance model was developed and applied to a series of CdTe/CdS cells with variations in structure and doping. The light measurements were ...

In this study, a process for developing nanospring-based electrical biosensors is presented. Impedance spectroscopy is used to characterize silica (SiO2) nanospring-based biosensors. The sensor is a capacitor consisting of two conducting surfaces with silica nanosprings as the dielectric spacer layer. The nanosprings are grown on glass substrates coated with indium tin oxide ...

*Although mechanical impedance and mobility are respectively defined as the complex ratio of sinusoidal force to sinusoidal velocity ...

... Title : MECHANICAL IMPEDANCE RESPONSE ALOGRITHM ANALYSIS OF TAPER-LOK BOLTED JOINTS. Corporate Author : ...

... of quantitatively, or at least qualitatively, interpreting our data. As described in ova? first report, we made impedance bridge ...