SNR value

Ip when the SNR value is reduced. Finally, they tested the effect of the number of sampling points from 2 to 2 °. The deviations in Ep and Ip are reduced with a higher value of this parameter. The authors concluded that the third-order B-spline wavelet basis, and truncation frequency L = 3, are the optimum parameters for processing voltammetric signals. 

In Eq. (7), E and E /2 represent, respectively, the measured and half-wave potentials, while n, F, R, and T denote the number of electron transferred, the Faraday constant, the Universal Gas Constant, and temperature, respectively. The authors found that the relative errors in the peak height were less than 3%, and those of the peak potential were less than 10% when the SNR value was reduced to 0.1. This technique has been applied successfully to analyse the voltammetric signal of a Cd(II)-succinate-oxalate complex system [19,20]. 

B-Spline wavelet analysis is a very good technique for processing volta-mmetric signals, but it also suffers a drawback. For a signal with a low SNR value, peak-potential shifting is always observed in the de-noised signal [25]. Therefore, Mo and his co-workers developed a new procedure by combining... 

Most mass spectrometers suffer from white noise (Johnson noise and shot noise), RF interference (i.e., radio stations, fluorescent light ballast supplies, switching power supplies, quadrupoles, etc.), and chemical noise (chemical interference peaks). Generally, the noise level reported for signal/noise calculations should be reported as root-mean-square (RMS) of the white noise, but this value can sometimes be difficult to determine if the experiment has much chemical noise. RF noise is not usually dense enough to be a major problem. Regardless, if SNR values are reported, it is important to report exactly how noise is calculated. 

Figure 7.5 Signal-to-noise ratio (SNR) value as a function of the phospholipid amount on the plate for MALDi-TOF positive-ion mass spectra of phosphatidylcholine (DPPC, ), PI PIP ( ), and PIP2 (o). 2,5-Dihydroxyben-zoic acid (0.5 M in methanol) containing 0.1 vol.% TFA was used as matrix. Data...

To quantify only the glare effect and not the effect of an imperfect display (as it might the case that these contrast resp. SNR values are bad to begin with even in the absence of glare ), these values have to be compared for the cases with and without glare source ... 

The two internal standards are added after the dilutions because they are always at the same concentration. The different solutions are analyzed by the method chosen by increasing concentrations to avoid residual effects. The limit of detection depends on each analyte it is estimated from the SNR on the corresponding chromatographic peak. There is no universal convention on the SNR value at which we consider that the limit of detection is reached. This value generally oscillates between 3 and 5, if not 10 for the most demanding analyses. The response function is plotted for each analyte. 

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