Theory of Faradaic distortion: Equation for the second-harmonic current

1964 ◽  
Vol 17 (7) ◽  
pp. 715 ◽  
Author(s):  
HH Bauer
Keyword(s):  
Voltage Drop ◽  
Second Harmonic ◽  
Electrochemical Reactions ◽  
Harmonic Current ◽  
Faradaic Impedance ◽  
Impedance Measurements ◽  
Current Voltage ◽  
Concentration Changes ◽  
Harmonic Components

An equation is derived for the magnitude of the second-harmonic current under ax. polarographic conditions. It is shown that the concentration changes of the depolarizer at the electrode surface do not contain second-harmonic components. The theory permits determination of the rate constant and transfer coefficient, for processes of greater speed than are amenable to elucidation by faradaic-impedance measurements. Furthermore, the major experimental difficulties in faradaic-impedance studies (base current, voltage drop in the series resistances) are virtually absent in second-harmonic work. Second-harmonic studies also promise to be advantageous in the elucidation of adsorption effects in electrochemical reactions.

Faradaic impedance measurements of the ferrous/ferric citrate system

1967 ◽  
Vol 20 (12) ◽  
pp. 2567
Author(s):  
D Elliott
Keyword(s):  
Electron Transfer ◽  
Reaction Mechanism ◽  
Ferric Citrate ◽  
Negative Dependence ◽  
Faradaic Impedance ◽  
Impedance Measurements ◽  
Impedance Technique ◽  
Transfer Stage

An examination of the ferrous/ferric citrate system has been made by the faradaic impedance technique. Determination of the reaction mechanism by the dependence of the rate on concentration has been attempted. The results have proved ambiguous in deciding whether the rate is controlled chemically or by the electron transfer stage. In addition, the negative dependence of the rate on iron(II) concentration has proved difficult to account for and a mechanism involving iron(IV) has been tentatively proposed.

Determination of Stress Components From Thermoelastic Data Without Boundary Conditions

1992 ◽  
Vol 59 (4) ◽  
pp. 841-847 ◽  
Author(s):  
T. G. Ryall ◽  
M. Heller ◽  
R. Jones
Keyword(s):  
Experimental Design ◽  
Noise Level ◽  
Stress Function ◽  
Second Harmonic ◽  
Noisy Data ◽  
Airy Stress Function ◽  
Harmonic Response ◽  
Stress Components ◽  
Harmonic Components

Recent investigations have shown that the temperature variation caused by sinusoidal loading of a solid consists of two harmonic components. In this paper it is shown that by using an appropriate Airy stress function the separated stress components can be obtained, almost always, with knowledge of these two components. Since the second harmonic response is small compared to the noise level, the question of experimental design is examined. The problem of uniqueness is also studied. The close similarity between the second harmonic response and various energy parameters is also investigated and its role in structural optimization is discussed. The method is demonstrated on a particular example using simulated noisy data.

Contactless and Spatially‐Resolved Determination of Current‐Voltage Curves in Perovskite Solar Cells via Photoluminescence

Solar RRL ◽  
2021 ◽  
Author(s):  
Anh Dinh Bui ◽  
Md Arafat Mahmud ◽  
Naeimeh Mozaffari ◽  
Rabin Basnet ◽  
The Duong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Spatially Resolved ◽  
Current Voltage

scholarly journals Receptivity of Boundary Layer over a Blunt Wedge due to Freestream Pulse Disturbances at Mach 6

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Jianqiang Shi ◽  
Xiaojun Tang ◽  
Zhenqing Wang ◽  
Mingfang Shi ◽  
Wei Zhao
Keyword(s):  
Boundary Layer ◽  
Fundamental Frequency ◽  
High Frequency ◽  
Pulse Wave ◽  
Second Harmonic ◽  
Acoustic Pulse ◽  
Disturbance Wave ◽  
Acoustic Disturbances ◽  
Disturbance Frequency ◽  
Harmonic Components

Direct numerical simulation (DNS) of a hypersonic compressible flow over a blunt wedge with fast acoustic disturbances in freestream is performed. The receptivity characteristics of boundary layer to freestream pulse acoustic disturbances are numerically investigated at Mach 6, and the frequency effects of freestream pulse wave on boundary layer receptivity are discussed. Results show that there are several main disturbance mode clusters in boundary layer under acoustic pulse wave, and the number of main disturbance clusters decreases along the streamwise. As disturbance wave propagates from upstream to downstream direction, the component of the modes below fundamental frequency decreases, and the component of the modes above second harmonic components increases quickly in general. There are competition and disturbance energy transfer between different boundary layer modes. The nose boundary layer is dominated by the nearby mode of fundamental frequency. The number of the main disturbance mode clusters decreases as the freestream disturbance frequency increases. The frequency range with larger growth narrows along the streamwise. In general, the amplitudes of both fundamental mode and harmonics become larger with the decreasing of freestream disturbance frequency. High frequency freestream disturbance accelerates the decay of disturbance wave in downstream boundary layer.

scholarly journals Junction Parameter Extraction for Electronic Device Characterization

2004 ◽  
Vol 27 (2) ◽  
pp. 61-67
Author(s):  
S. Dib ◽  
C. Salame ◽  
N. Toufik ◽  
A. Khoury ◽  
F. Pélanchon ◽  
...  
Keyword(s):  
Electronic Device ◽  
Control Process ◽  
Parameter Extraction ◽  
Exponential Model ◽  
Voltage Characteristic ◽  
Model Parameters ◽  
Current Voltage Characteristic ◽  
Device Characterization ◽  
Current Voltage

A new method for the extraction of junction parameters from a description of the current–voltage characteristic is developed. A simulation is performed and a high accuracy is obtained for the determination of the singleexponential model parameters. The method is easy to implement in a control process for device characterization. An application, achieved to observe the degradation of the emitter–base junction of a bipolar transistor during an aging experiment, shows that the evolutions of the single exponential model parameters versus time introduce a means for degradation quantification.

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