What Are the Five Generations of Computers? In this Webopedia Study Guide, you'll learn about each of the five generations of computers and the technology developments that have led to the current devices that we use today. Our journey starts in 1940 with vacuum tube circuitry and goes to the present day â and beyond â with artificial intelligence.
Jan 31, 2012 08:49:47 #. Leonora. Yes you can block acrylic yarn. Carefully pin out to shape, then put iron onto steam, hold about 1-2 inches above project and allow steam to penatrate for approximately 10 seconds at a time, while gently patting with finger tips any irregularities in the knitting to even out. Do this all over project until you have covered it all.
Acrylic is our final fiber. It can be thought of as artificial wool. It is made from the unlikely combination of coal, air, water, oil and limestone. DuPont first made acrylic fibers in 1944 and began commercial production in 1950. It is spun by either dry spinning or wet spinning. In dry spinning the dissolved polymers are extruded into warm air. The fibers solidify by evaporation. In wet spinning the polymer is dissolved and extruded into a bath and then dried. In some ways, acrylic imitates wool. It has wool's warmth and softness, but does not absorb water. Instead, acrylic wicks moisture to the surface where it evaporates.