| http://www.w3.org/ns/prov#value | - A membrane 50 can be arranged as a series of folds such as shown in FIG. 2C. FIGS. 2D and 2E show another technique where a polymer membrane 52 is provided with macroscopically irregular (shown) or microscopically (not shown) roughened membrane surfaces to increase the effective membrane surface area for vaporization.
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