Factors influencing the limiting current in pulse polarography

1987 ◽  
Vol 52 (3) ◽  
pp. 587-591
Author(s):  
Jorge A. Bolzan
Keyword(s):  
Time Delay ◽  
Pulse Width ◽  
Adsorption Kinetic ◽  
Limiting Current ◽  
Powerful Technique ◽  
Factors Influencing ◽  
Pulse Polarography ◽  
Dc Polarography ◽  
Mercury Column ◽  
Catalytic Processes

The variation of the limiting current as a function of h, the corrected height of the mercury column, and t, the time delay plus pulse width, are studied and compared with the similar relationships of DC polarography. Diffusion, adsorption, kinetic and catalytic processes are examined. Though pulse polarography is in almost every respect a much more powerful technique than DC polarography, it is shown that while the latter allows a distinction to be drawn between the different processes, by using the above mentioned relationships, the former is not suitable for the same purpose.

Reduction and tensammetric pulse-polarographic currents of polynucleotides

1987 ◽  
Vol 52 (11) ◽  
pp. 2810-2818 ◽  
Author(s):  
Emil Paleček ◽  
František Jelen ◽  
Vladimír Vetterl
Keyword(s):  
Diagnostic Criteria ◽  
Pulse Width ◽  
Mercury Electrode ◽  
Pulse Amplitude ◽  
Single Strand ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode ◽  
Adenylic Acid ◽  
Drop Time

The behaviour of electrochemically reducible single-strand polynucleotides (poly(adenylic acid)) and poly(cytidylic acid)) was studied by the differential (derivative) pulse polarography (DPP) and by other methods. Measurements were performed with the help of the dropping mercury electrode under various conditions specified by the pulse width, pulse amplitude, drop time etc. For the faradaic and tensammetric DPP peaks the diagnostic criteria were proposed which make it possible to classify even very small DPP peaks of double helical polynucleotides.

Study on the Factors Influencing the Layer Precision in Hybrid Plasma-Laser Deposition Manufacturing

2010 ◽  
Vol 97-101 ◽  
pp. 3828-3831 ◽  
Author(s):  
Ying Ping Qian ◽  
Ju Hua Huang ◽  
Hai Ou Zhang
Keyword(s):  
Laser Beam ◽  
Pulse Width ◽  
Average Power ◽  
Laser Deposition ◽  
Metal Part ◽  
Plasma Laser ◽  
Powder Feed ◽  
Factors Influencing ◽  
Hybrid Plasma ◽  
Frequency Pulse

The present study is a continuation of the previous research on direct metal part fabrication with hybrid plasma-laser deposition manufacturing (PLDM). It is remarkably important for manufacturing high accurate part to investigate the factors influencing the precision of deposited layer and obtain the influence rules. Many factors perhaps affect the layer precision, such as average power of laser, repetition frequency, pulse width, hybrid angle between laser beam and plasma beam, speed of powder feed, deposition speed, and amount of feed along Z direction and so on. In this paper, the factors except laser parameters published in other paper were researched experimentally. The results were concluded as follows: (1) The width of the layer increases and the thickness decreases with the increasing of hybrid angle. (2) The depth of layer increases with the increasing of the amount of powder feed but the width of layer is nearly unchanged. (3) The width and thickness of layer reduces with the increasing of deposition speed. (4) The deviation between the amount of feed along Z direction and the depth of depositing layer makes the part precision decrease.

Competitive chemical reactions in DC polarography: Influence of fast protonation equilibria on CE and ECE mechanisms

1991 ◽  
Vol 56 (1) ◽  
pp. 68-77 ◽  
Author(s):  
Eulogia Muñoz ◽  
José L. Avila ◽  
Juan J. Ruiz ◽  
Luis Camacho
Keyword(s):  
Kinetic Parameters ◽  
Chemical Reactions ◽  
Limiting Current ◽  
Quasi Equilibrium ◽  
Polarographic Study ◽  
Protonation Equilibria ◽  
Direct Competition ◽  
Dc Polarography ◽  
Catalytic Effects

We carried out a DC polarographic study of the limiting current for CE and ECE processes with chemical stages subject to potential catalytic effects and in direct competition with protonation reactions in quasi-equilibrium. The aforesaid competition may result in the appearance of maxima in the limiting current vs pH plots for CE mechanisms. We established the conditions required for the rise of such maxima, and developed methods for the calculation of kinetic parameters. The competition did not result in any maxima in the above-mentioned plots for ECE mechanisms; however, we established criteria for their potential identification.

scholarly journals SENSITIVITY ANALYSIS ON THE EFFECT OF MEASUREMENT NOISE AND SAMPLING FREQUENCY ON THE CALCULATION OF THE TEMPORAL LIGHT ARTEFACTS

2021 ◽  
Author(s):  
A. Thorseth ◽  
J. Lindén ◽  
C.A. Bouroussis
Keyword(s):  
Measurement Uncertainty ◽  
Pulse Width ◽  
Random Noise ◽  
Sampling Frequency ◽  
Measurement Noise ◽  
Light Modulation ◽  
Pulse Width Modulated ◽  
Dc Offset ◽  
Health And Wellbeing ◽  
Factors Influencing

Temporal light modulation (TLM) and the resulting temporal light artefacts (TLA) can cause problems with health and wellbeing for users of lighting products. Therefore, TLM has to be measured accurately and repeatably. This study investigates important factors influencing the measurement uncertainty of TLM measurements. The study shows how measurement uncertainty on central TLM parameters can have a significant effect on the calculation of TLA. Specifically, we show a linear relationship between DC offset and the expected error. Further we show severe effects of random noise on PstLM on certain waveforms. And lastly, we show a curious effect related to SVM of pulse width modulated signals and the measurement sampling frequency.

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