RECTANGULAR TRIMMED SURFACE

RECTANGULAR TRIMMED SURFACE ( name name , , ) ... 

This is a composite surface having a simple rectangular topology with n u patches in u direction and n v patches in v direction. Each composite surface must be bounded and topological rectangular and therefore be either a B SPLINE SURFACE or a RECTANGULAR TRIMMED SURFACE. It is required that there is at least positional continuity between the adjacent patches. 

RECTANGULAIC TRIMMED SURFACE, RECTANGULAR COMPOSITE SURFACE, OFFSET SURFACE ) ... 

For these experiments, some of which were also conducted on the ILL D17 small-angle diffractometer, crystals of n-butylammonium vermiculite exhibiting the fewest obvious structural defects were selected and trimmed to a rectangular cross section with a razor blade. This enabled the surface area, and therefore the applied pressure, to be measured accurately. The samples were then immersed in a dilute solution of n-butylammonium chloride of the desired concentration and allowed to swell freely. After equilibration for at least two days at 7°C, the swollen (or colloidal) gel phase samples were placed into the uniaxial pressure cell shown in Figure 3.1. 

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