Roughness and correlation-length determination of rough-surface objects using the speckle contrast

1987 ◽  
Vol 44 (3) ◽  
pp. 167-173 ◽  
Author(s):  
H. Kadono ◽  
T. Asakura ◽  
N. Takai
Keyword(s):  
Rough Surface ◽  
Correlation Length ◽  
Speckle Contrast ◽  
Length Determination

Research on the Obtainment of Topography Parameters by Rough Surface Simulation With Fast Fourier Transform

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Yan Fei He ◽  
Jin Yuan Tang ◽  
Wei Zhou ◽  
Dong Ri Liao
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Rough Surface ◽  
Autocorrelation Function ◽  
Correlation Length ◽  
Relevant Literature ◽  
Contact Model ◽  
Radius Of Curvature ◽  
Numerical Fitting

Asperity radius of curvature and asperity density, which are generally obtained from rough surface simulation with fast Fourier transform (FFT), are the two essential parameters for statistical contact model. In simulation, however, the value of a parameter (defined as “autocorrelation function (ACF) truncation length” in this paper), which is arbitrarily chosen and has been paid little attention to in most relevant literature, is found to have a great effect on topography parameters, regardless of the methods chosen to calculate them. Improper determination of the ACF truncation length may induce erroneous results. This paper points out how to make the proper determination of the ACF truncation length to guarantee a certain degree of precision and explains why improper determination of the ACF truncation length may cause serious errors when calculating the topography parameters. Besides, the asperity radius of curvature and the asperity density of the generated rough surfaces are calculated using the eight-summit identification method, and their formulae in terms of correlation length are obtained through numerical fitting.

A Comparison Between Ladell's Wood Section Method and the Macerated Wood Method for Tracheid Length Determination

IAWA Journal ◽  
1983 ◽  
Vol 4 (4) ◽  
pp. 245-247 ◽  
Author(s):  
A. P. Wilkins ◽  
R. K. Bamber
Keyword(s):  
Sample Preparation ◽  
Traditional Method ◽  
Precise Location ◽  
Section Method ◽  
Tracheid Length ◽  
Wood Section ◽  
Length Determination

A comparison has been made between the method of Ladell, in which tangential longitudinal sections are used for the determination of mean tracheid length and the traditional method using macerated wood. The two methods produced identical results. Ladell's method was quicker, enabled precise location of measured cells and required less sample preparation.

A Metric for Automatic Word-Length Determination of Hardware Datapaths

2006 ◽  
Vol 25 (10) ◽  
pp. 2228-2231 ◽  
Author(s):  
M.-A. Cantin ◽  
Y. Savaria ◽  
Prodanos ◽  
P. Lavoie
Keyword(s):  
Word Length ◽  
Length Determination
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