... BY DC AN AC ELECTROCHEMICAL TECHNIQUES AS COMPARED ... IMPEDANCE DIAGRAMS SHOW THAT A SLIGHTLY ...
DTIC Science & Technology
... 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 ...
... Abstract : Two in situ techniques, dynamic imaging ... LEIS is an electrochemical impedance technique that generates local ac impedance data by ...
... Assisted DC and AC Techniques in Electrochemical ... data acquisition and calculation method, allows the ... Impedance measurements give the same ...
... of a Scanning Electrochemical Impedance Spectroscopy Technique ... This article describes a method of generating ... by driving an ac current between ...
... of the ac impedance at a metal-electrolyte interface as a function of frequency are depicted, and recently developed measurement techniques are ...
... Abstract : Electrochemical techniques for predicting stress corrosion cracking (SCC ... potentials with continuous recording of the ac impedance in a ...
... electrochemistry of titanium in the LiCl-KCl eutectic melt has been investigated by means of pulse techniques and ac impedance measurements. ...
... Abstract : Although ac impedance has come to prominence lately for studying anti ... At first sight this is surprising since the techniques are very ...
... 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 ...
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 ...
Energy Citations Database
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...
National Technical Information Service (NTIS)
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...
... frequency dispersion of the impedance is observed ... A method of estimating the true specific ... at gold/solution interface, ac admittance techniques ...
... 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 ...
... the techniques being developed or investigated are NDT methods which include electrochemical (linear polarization, ac impedance, and small ...
... 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 ...
... L in hydrazine have also been measured by several electrochemical techniques such as Tafel plots, polarization resistance, and AC Impedance. ...
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...
... Title : AC IMPEDANCE MEASUREMENT OF ENVIRONMENTAL ... OF INTERFACIAL IMPEDANCE MEASUREMENT ARE ... OF THE METHOD IN ...
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 ...
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 ...
... I Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies by ... AC Impedance Analysis - ...
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, ...
... 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 ...
... 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 ...
... hot corrosion processes at 1173 K. An AC impedance technique for the total electrical conductivity, the potentiostatic polarization method for ionic ...
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. ...
... at three rotation speeds (600,1200 and 1800 rpm), using electrochemical small amplitude cyclic voltammetry and AC impedance techniques. ...
... Title : Evaluation of the State of Charge of Battery Electrodes with AC impedance Techniques. Descriptive Note : Rept. for 1 Aug 1988-30 Jul 1989,. ...
... comparison is made between two electrical techniques for studying the deterioration of polymer-coated metals. AC impedance measurements and ...
technique and alternating current (ac) impedance spectroscopy provides data on the corrosion resistance of alloys, performance of corrosion inhibitors, ...
NASA Website
In the present investigation, Electrochemical Impedance Spectroscopy (EIS) was used ... range of 100 kHz to 0.01 Hz, with 10 mV AC amplitude. ..... Techniques in the Space Transportation System (Space Shuttle) Launch Environment," ...
The need for the system harmonic impedance information and methods to determine it by test and/or calculation is addressed. The project undertook research to measure harmonic impedances and sources on a power system and to modify existing analytical techniques to more closely match the field test measurements. The information will ...
NASA Astrophysics Data System (ADS)
A scanning ac probe technique has been developed to measure the impedance variations of electrode surfaces in electrolytes resulting from heterogeneities. The technique can be applied to all conducting surfaces in conducting liquids. Measurements have been conducted on abraded specimens, partially etched Alloy 600, ...
Laboratory tests have shown that the a.c. electrochemical technique being developed meets the basic requirements for in situ corrosion monitoring of the secondary side of PWR steam generators. The technique uses two probe electrodes which measure the electrochemical impedance of the corroding surface. The ...
... THE SURFACE IMPEDANCE SYNTHESIS TECHNIQUE ... 5. FUNDING NUMBERS THE SURFACE IMPEDANCE SYNTHESIS TECHNIQUE ...
... Title : APPLYING AC IMPEDANCE ELECTROCHEMICAL METHODS TO CORROSION TESTING COBALT ALLOY MEDIA. Corporate Author : ...
This article describes a new measurement technique that utilizes impedance spectroscopy for the characterization of thermoelectric materials and devices. Two circuit models were developed and used to help explain the impedance spectroscopy data using transmission line theory and a coupled electrothermal model. Two testing ...
PubMed
Process specifications for the deposition of all the thin films have been finalized. The technique for fabricating tantalum-aluminum films has been changed. AC impedance measurements at 200 MHz indicate that this technique is not as good as DC measurement...
... 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. ...
A flow-system technique has been developed that detects the high-frequency resistance and capacitance changes in a sensing orifice due to the passage of cells through the orifice. The resistance and capacitance changes are related to cell properties such as size, plasma membrane capacitance, and electrical resistivity of the cell interior. The relationship between measured ...
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 the electrode, to the applied potential is measured as a ...
Electrochemical reactions at solid electrolyte-electrode-gas interfaces are being investigated with ac impedance and dc polarization techniques using an unbonded interface cell (UIC). The UIC approach eliminates influence of sample size and interface morp...
Contents: Welcome; Division Programs; Electricity Highlights; The Electronic Kilogram; Voltage Metrology; Metrology of the Ohm; Single Electron Tunneling; AC-DC Difference Standards and Measurement Techniques; Farad and Impedance Metrology; Pulse Metrolog...
A highly sensitive non-destructive method employing a scanning technique is described for sensing variations in metal surfaces in aqueous environments, using ac impedance. The probe consisted of a dual compartment with two orifices passing through its bas...
... A Comparison of Acoustic Impedance Measurement Techniques ... S. FUNDING NUMBERS A Comparison of Acoustic Impedance Measurement ...
This conference proceedings contains 24 papers, of which 2 are indexed separately. The topics discussed ranged from various aspects of localized corrosion phenomena (such as pitting, crevice corrosion, corrosion fatigue, and stress corrosion cracking) to the use of a-c impedance techniques and a number of special areas usually not ...
This review describes recent advances in electrochemical impedance spectroscopy (EIS) with an emphasis on its novel applications to various electrochemistry-related problems. Section 1 discusses the development of new EIS techniques to reduce measurement time. For this purpose, various forms of multisine EIS techniques were first ...
The a.c. impedance method is a very useful technique for studying the corrosion behaviour of surgical implant alloys. In this article information is presented on how to efficiently and reliably acquire and analyse experimental data through the use of Nyquist, Bode and Rre versus omega Rim plots. Also, experiments were conducted in ...
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 ...
The kinetics of lithium passivation and the development of the impedance of carbon electrodes and LiGaCl4 and LiAlCl4 nonsolvate electrolytes in rechargeable Li/So2 cells have been studied using the ac impedance technique. The effects of cycling and depth of discharge (DOD) on impedance ...
... 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 ...
One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increased in dental research. Several ...
... 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 ...
... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...
... 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,. ...
... 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 Analysis of Corrosion Fatigue in Naval Aircraft Alloys. ... this program is to develop rapid electrochemical methods for evaluating ...
... Title : AC IMPEDANCE INVESTIGATION OF TA(2)O(5) FILM FOR USE AS A STORAGE CAPACITOR DIELECTRIC. Corporate Author : ...
... TITLE (Include Security Cawsfication) "IMPEDANCE PROFILING: A CONVENIENT TECHNIQUE FOR DETERMINING THE REDOX OR PROTONIC ...
The use of impedance spectroscopy to evaluate transdermal drug delivery is discussed and new techniques and protocols are suggested to avoid or minimize potential problems. A novel multichannel impedance analyzer, exploiting the advantages of the "three-electrode" configuration, was employed to measure the effects of differing ...
... 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 : ...
... jUN 0 91994D * F ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF ... 16. PRICE COOE ac-Impedance, Chromate, Aluminum Alloys 17. ...
In the present investigation, holographic interferometry was utilized for the first time to measure the alternating current (A.C.) impedance of aluminum samples during the initial stage of anodization processes in aqueous solution without any physical contact. The anodization process (oxidation) of the aluminum samples was carried out chemically in ...
... 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 ...
... OF INFLUENCING PARAMETERS BY IMPEDANCE PLANE ANALYSIS ... AC MAGNETOGRAPHY ... A SERIES OF TEST METHODS INTEGRATED IN A ...
... APPLICATION OF COLLOCATION METHODS REDUCES THE ... CRACK IN THE AC FIELD OF A ... AS WELL AS THE IMPEDANCE CHANGES DUE ...
Two in situ techniques, dynamic imaging microellipsometry (DIM) and local impedance spectroscopy (LEIS), were developed and applied to a study of the effect of microstructure on passive film formation and breakdown on Al-Ta alloys. DIM acquires ellipsometric data (thickness and optical constants of the films on surfaces) at a spatial resolution of ca. 20 ...
