Chronopotentiometric Study of EC Mechanism Duringthe First Cycle of Alternating Current

1997 ◽  
Vol 62 (5) ◽  
pp. 709-728 ◽  
Author(s):  
Ángela Molina ◽  
Francisco Martínez-Ortiz ◽  
Ricardo Ruiz ◽  
Manuela López-Tenés
Keyword(s):  
Theoretical Result ◽  
Kinetic Parameters ◽  
Theoretical Approach ◽  
Alternating Current ◽  
Transition Time ◽  
Ec Mechanism ◽  
Sinusoidal Current

The theoretical approach to the application of the first period of a sinusoidal current at static and dynamic spherical electrodes for study of EC mechanism is presented. Methods for determining heterogeneous and homogeneous kinetic parameters are proposed. In order to check theoretical result, the rate of benzidine rearrangement was evaluated from transition time measurements.

Regeneration Mechanism Studied by Potential-Time Response to Sinusoidal Current-Time Function

1997 ◽  
Vol 62 (10) ◽  
pp. 1511-1526
Author(s):  
María-Luisa Alcaraz ◽  
Ángela Molina
Keyword(s):  
Kinetic Parameters ◽  
Rate Constant ◽  
Theoretical Study ◽  
Time Function ◽  
Time Response ◽  
Current Time ◽  
Regeneration Mechanism ◽  
Sinusoidal Current ◽  
Regeneration Processes

A theoretical study of the potential-time response to sinusoidal current applied to static and dynamic electrodes for regeneration processes is presented. Methods for determination of the regeneration fraction, rate constant of the chemical reaction and heterogeneous kinetic parameters are proposed.

scholarly journals Formation of Copper Powders in the Cathode Half-Period of Alternating Current

2019 ◽  
Vol 35 (2) ◽  
pp. 689-693
Author(s):  
Abduali Bayeshov ◽  
Azhar Bayeshova ◽  
Dinara Abizhanova ◽  
Umida Abduvaliyeva
Keyword(s):  
Alternating Current ◽  
Research Paper ◽  
Current Yield ◽  
High Current ◽  
Optimum Conditions ◽  
Transient Currents ◽  
Titanium Electrode ◽  
Copper Powders ◽  
Sinusoidal Current ◽  
Current Flows

In the proposed research paper, we considered the pattern of formation of copper powders during the polarization of electrodes by transient currents. When a copper-titanium pair of electrodes is polarized with an industrial alternating current of 50 Hz in a solution of copper (II) sulfate, it is shown that copper powders with a high current yield are formed on the surface of the titanium electrode. Under optimum conditions, the current yield is 80%. The size of the formed copper powders is 0.5-2 µm. The analysis of the obtained oscillograms showed that when titanium is used in the circuit, the asymmetrical sinusoidal current flows.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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