An EC summer school by Sellwood, Astrophysical discs.

By Sellwood, Astrophysical discs.

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Add to all this the complications in the transitions brought about as laminar flows become turbulent together with the chaotic behavior of some strongly driven chemical reaction, and we rapidly can assume we can know very little about the mechanisms operating. Were just one of these constraints not January 13, 2006 14:11 SPI-B334 The Incredible Shrinking Bee (Ed: Joy Quek) Bees and Devices ch02 31 present, a very different structure would result. You have the ‘C’ word again; take your pick: chaos or complexity.

An open circulation lacks capillaries and veins. It’s more like a swimming pool hooked to a filter pump that circulates the water. Imagine yourself standing in a pool of water pumping a foot pump one uses to fill air mattresses and plastic balls. You supply the energy for the pump. As your foot rises, the pumping chamber expands drawing water in through the inlet valve. When your foot descends and squeezes the water trapped in the pump, the increasing water pressure closes the inlet valve that prevents back flow from the pump.

But all’s not lost. We have spin-off from our labors, no pun intended. By mimicking the amide linkages in the chains of polymers as we did with nylon, we made Kevlar. The aramid fiber of Kevlar even contains hydrogen bonds in liquid January 13, 2006 14:11 SPI-B334 The Incredible Shrinking Bee (Ed: Joy Quek) Bees and Devices ch02 19 crystal form similar to a concentrated silk solution that improves Kevlar’s strength. But real silk? Not yet. We can even shear fibers as they extrude from our machines, and we can crudely mimic a spider’s spinneret to produce a tough fiber called rocket wire, so we are getting there.

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