Scrubbing Bubbles

Cleaning produce helps fruits and vegetables last longer and reduces the chances for foodborne illness. But it can be a difficult feat with soft, delicate foods like tomatoes, berries, or greens. Current methods often combine ultrasonic cleaning and chemicals like chlorine. Instead, researchers are looking to boost the cleaning power of bubbles themselves by giving them an acoustic pick-me-up.

The team combined a bubble-filled bath with sound at low (sub-cavitation) frequencies. They found that driving sound waves at the right frequency could vibrate the bubbles in a way that made them slide in a stop-and-go motion along inclined surfaces. This swaying significantly boosted their cleaning power; getting surfaces 90% cleaner than non-resonating bubbles did. (Image credit: S. Hok/Cornell University; video and research credit: Y. Lin et al.; via Gizmodo)

Making Bubbles in Magma

When bubbles form in magma deep below the earth, volcanic eruptions follow. Scientists believe this happens when decompression of the magma allows volatile compounds to come out of solution and form bubbles–just as opening a bottle of seltzer allows carbon dioxide to bubble out. But a new study indicates that decompression may not be the only source of bubbles.

The team found that supersaturated fluids can nucleate bubbles when they’re sheared–even without decompression. They demonstrated this in the lab, not with magma but with a low-temperature magma analog, seen above. The more saturated with volatiles the fluid is, the less shear is needed to trigger bubbles.

Viscous shear is everywhere for magma, so this bubble formation mechanism is likely common. Better understanding how and when bubbles form in magma directly affects predictions for eruptions–especially for determining whether they’re likely to be explosive or effusive. (Image credit: volcano – A. Bonnerdeaux, experiment – O. Roche et al.; research credit: O. Roche et al.; via Physics World)

On the Mechanics of Wet Sand

Sand is a critical component of many built environments. As most of us learn (via sand castle), adding just the right amount of water allows sand to be quite strong. But with too little water — or too much — sand is prone to collapse. For those of us outside the construction industry, we’re most likely to run into this problem on the beach while digging holes in the sand. In this Practical Engineering video, Grady explains the forces that stabilize and destabilize piled sand and where the dangers of excavation lie. (Video and image credit: Practical Engineering)

#civilEngineering #fluidDynamics #geophysics #granularMaterial #granularMaterial_ #infrastructure #physics #science #shear

SciTech Chronicles. . . . . . . . .Mar 6th, 2025

https://bit.ly/stc030625

#Poisson #polystyrene #polybutylene #shear-rolling #sea-level #EastGRIP #1,500-meter-long #fiber-optic #microcracks #cascade #Keystone-molecules #alderenes #tetrodotoxin #saxitoxin #dimethylsulfoniopropionate #SMBC #advertisements #Hiveworks #profitable #LMC68 #ionized #recurrent #near-infrared

I'm back! Been a bit busy with life, here's a cute outfit that I found somewhere on the internet

#cute #outfit #shear #NSFW #sketch #art #boobs #sexy

In depth look at my shear geometry node in blender

https://makertube.net/w/wAgRi922RkRAfzB9LH9Lf9

shear - geometry nodes in blender

https://makertube.net/w/2oRvE8gDJ39mZsEqnKbtaY