A ‘lucky’ statistician

he was called the luckiest woman in the world.  But now that luck is being called into question by some who think that winning the lottery four times is more than just a coincidental spell of good fortune. Joan R. Ginther, 63, from Texas, won multiple million dollar payouts each time. First, she won \$5.4 … Read moreA ‘lucky’ statistician

Mass transfer in a rotating disk reaction vessel (Part 2)

Shown here is a schematic of the rotating disk and how the fluid underneath it moves in response. Notice that the flow near the disk is essentially thrown out to the sides while away from the disk the fluid is effectively pumped towards the disk. There are essentially two separate processes in play here. Far … Read moreMass transfer in a rotating disk reaction vessel (Part 2)

Flame Challenge

A few months ago I submitted an entry to Alan Alda’s flame challenge.  Although I was not a finalist I wanted to share the submission.  I hope you enjoy it. [dropcap style=”1″ size=”3″]C[/dropcap]onsider the flame from a simple candle. If you stare very closely at the wick, you will see wax bubbling away on its surface … Read moreFlame Challenge

Mass transfer in a rotating disk reaction vessel (Part 1)

The first problem here will discuss a technique used by geologists to characterize stone. A sample of the stone to be studied is rotated at high speed in a bath of concentrated acid and the products of its dissolution are measured over time. From this information one can properties of the stone. To be specific, … Read moreMass transfer in a rotating disk reaction vessel (Part 1)