Center line average roughness

Figure 6-6 The notation for surface roughness (Rji center line average roughness, I measured height, C centerline, Rrm root mean squared roughness, Rmax maximumheight).

Figure 12-5. Center-line average and root-mean-square surface roughness, cencer-line average peak height is given by Ul dl...

CLA n. Abbreviation for center-line average (BS 1134) indication of surface roughness. 

The instrument used was a Rank Organization Talysurf 4 which embodies a diamond stylus of 2.5 ym diameter that exerts a normal force of 100 mg (25). Various traverse distances could be employed to produce a recording of the surface. Quantification in the form of center-line-average (CLA), roughness which is a standard measure of surface texture (ASA B46 1955), could be obtained. 

Receding and advancing radii of curvature can be correlated successfully as functions of roughness with the aid of a stylus-type tracing instrument which enables determination of center-line-average (CLA) roughness. 

Figure 5.8 Static coefficient of friction versus load against steel of various surface roughnesses for DuPont Delrin 500 acetal resin. CLA, center-line average [4].

Roughness, surface (RJ The arithmetic mean of the departure of the roughness profile from a mean value. The is also called the Center line average (CLA). 

In Section II,A, we consider the types of spectra expected for rapid anisotropic motion within a bilayer superstructure (Fig. 6A). It has bwn known for some time that certain lipids will form a completely different type of structure in which the molecules project radially from the center of a cylinder (Fig. 6B Luzzati and Husson, 1962). As mentioned in Section II,B, rapid lateral diffusion within a bilayer phase only affects P-NMR line shapes if the lamellae enclose a particle of small radius. The cylinders in a hexagonal phase have a very small radius, and therefore lateral diffusion about the cylinder axis can cause further averaging of tensor components. The unique axis of the system now becomes the axis of the cylinder, and thus we label its chemical-shift component ap. However, noticing that along this axis the field would be roughly normal to the fatty acyl chains, we would expect the value of this chemical shift to be similar to. On the other hand. 

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