Clever sifting

时间:2019-03-06 08:15:09166网络整理admin

A “smart sieve” that separates tiny particles into different sizes and weighs them at the same time has been developed at University College London. Haroun Mahgerefteh and his colleagues blow the particles into a coiled spring. A “stepper motor” then gradually pulls the spring apart, so particles fall through the expanding gaps in ever-increasing sizes. The change in weight of the apparatus is monitored,