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The combination of frequencies and modes with minimum attenuation in high and low frequencies are determined.
Among RE ions, Er3+ is of particular interest due to the 4I13/2 → 4I15/2 transition at 1.54 μm, which corresponds to the minimum attenuation in commonly used silica optical fibers.
To determine the filter parameters needed to satisfy the desired specifications, one can use the graphs of normalized passband and stopband cut-off frequencies versus filter order N. Two graphs, one for maximum attenuation in the passband and one for minimum attenuation in the stopband, are given here.
Area under the attenuation curve (AUC), maximum attenuation, minimum attenuation in the brain parenchyma were assessed in each time series.
The fact that there was no significant difference in maximum attenuation but significant difference in minimum attenuation in a time series between LD and ULD can be explained by higher SNR after contrast enhancement.
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Based on the Alborz Tokamak operational conditions, the characteristic frequencies, and some dimensional limitations, all parts of reflectometer have been designed so that an appropriate efficiency with minimum attenuation, especially in transmitting/receiving system would be achieved.
The study also gives the attenuation which a numerical model should provide in the reference situation in order to guarantee a minimum attenuation when knowing the errors in the spatial distribution of the primary field.
However, there was no significant difference in minimum attenuation values between the ULD+HYPR dataset and the LD dataset (38±4 vs. 40±3 HU, p = 0.13).
In each case, there is a passband, where wanted signals get only minimum attenuation, and a stopband, where unwanted signals get attenuated a lot.
In these conditions, the present study shows the gap between the minimum attenuation guaranteed by a control system and the optimal attenuation associated with the primary field of reference.
TAM-based subtraction image (hereafter TAM image) is obtained by subtracting the minimum attenuation channel from the maximum attenuation one.
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