By J Gordon Cook
A finished survey of the traditional fibres – animal, vegetable and mineral – on which we depended for our textiles till relatively lately.
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Additional resources for Handbook of Textile Fibres (Woodhead Publishing Series in Textiles)
Having the number of horizontal and vertical scans, the number of pixels in perpendicular direction which is the fiber diameter could be measured from a geometrical relationship. The explained process is illustrated in Fig. 5. 5. Diameter measurement based on two scans in direct tracking method. 6 shows a labeled simple simulated image and the histogram of fiber diameter obtained by this method. 6. (a) A simple simulated image which is labeled, (b) Histogram of fiber diameter distribution obtained by direct tracking.
Now that the background is homogeneous and the edges of the objects are clearer, a global thresholding could be applied to provide the binary image. It could be shown that this process is equivalent to segment the image with locally varying thresholds. 13. Thresholding: (a) a typical micrograph of electrospun web, (b) global thresholding, (c) top-hat transformation, (d) local thresholding. KEYWORDS • • • • • • • Dilation Electrospun nanofiber webs Euclidean metric Fiber diameter Global thresholding Medial axis transformation Pruning procedure Chapter 8 Update on Control of Electrospun Web Pores Structure INTRODUCTION The electrospinning process uses high voltage to create an electric field between a droplet of polymer solution at the tip of a needle and a collector plate.
However, not all openings are squares, yet the equivalent square area of openings is used to determine their equivalent dimension because this simplified assumption results in one single opening size from the open area. 2. Equivalent opening size, Oi, based on (a) equivalent area, (b) equivalent size. From the EOSs, PSD and an equivalent diameter for which a certain percentage of the opening have a smaller diameter (Ox, pore opening size that x percent of pores are smaller than that size) may be measured.