Posts Tagged ‘art’

Meshing Gears

January 12, 2014

Another fabulous image by Paul Nylander at bugman123.com.

image by Paul Nylander bugman123.com

A set of 242 interlocking bevel gears arranged to rotate freely along the surface of a sphere. This sphere is composed of 12 blue gears with 25 teeth each, 30 yellow gears with 30 teeth each, 60 orange gears with 14 teeth each, and 140 small red gears with 12 teeth each. I also found 3 other gear tooth ratios that will work, but this one was my favorite because the small gears emphasize the shape of a truncated rhombic triacontahedron.

Fluid jets and fishbones

August 9, 2013

Just a few examples from a striking gallery of pictures by  John W. M. Bush (MIT Mathematics)

Colliding jets and the patterns that ensue.

Fishbone john bush

colliding jets john bush

We examine the form of the free surface flows resulting from the collision of equal jets at an oblique angle. Glycerol-water solutions with viscosities of 15-50 cS were pumped at flow rates of 10-40 cc/s through circular outlets with diameter 2 mm. … At low flow rates, the resulting stream takes the form of a steady fluid chain, a succession of mutually orthogonal fluid links, each comprised of a thin oval sheet bound by relatively thick fluid rims. The influence of viscosity serves to decrease the size of successive links, and the chain ultimately coalesces into a cylindrical stream. As the flow rate is increased, waves are excited on the sheet, and the fluid rims become unstable.  The rim appears blurred to the naked eye; however, strobe illumination reveals a remarkably regular and striking flow instability. Droplets form from the sheet rims but remain attached to the fluid sheet by tendrils of fluid that thin and eventually break. The resulting flow takes the form of fluid fishbones, with the fluid sheet being the fish head and the tendrils its bones. Increasing the flow rate serves to broaden the fishbones.  In the wake of the fluid fish, a regular array of drops obtains, the number and spacing of which is determined by the pinch-off of the fishbones.

Algebraic Art

June 1, 2013

Found this while browsing:

A cartography of the anthropocene

October 20, 2011

Stunning images by Felix PharandDeschenes at Globaia : A Cartography of the Anthropocene

Cities are yellow ; roads are green ; ships are blue ; airlines are white: image globaia

Microscopic secrets

September 12, 2010

The Guardian reports that Spike Walker was awarded the Royal Photographic Society‘s combined Royal Colleges medal for his ‘outstanding contribution to photography and its application in the service of medicine’. A retired schoolteacher, Spike produces photomicrographs in his garage, which he has converted into a laboratory

Dopamine is a key neurotransmitter released in our brains when we do something rewarding. The dopaminergic system is behind most good feelings we have, and it is also the chemical that is targeted by highly addictive drugs such as cocaine.