All your science in here


#421

#422

I know two people who have reversed type 2 using slimming world.

I’ve been a lazy cheating bastard and have lost 22 lbs in just under 3 months


#423

Yeah, but you did it through the 200 drinks diet :joy:


#424

Sound from light?

https://www.graphene-info.com/researcher-develop-worlds-first-light-driven-speaker-using-3d-graphene-sponge


#425

The researchers say that unlike conventional loudspeakers, this high-fidelity photo-speaker does not … need any type of … complicated system for sound generation.

Right. Just an audio-modulated relatively high-power laser beam then.

VB


#426

I don’t claim to understand the technical details, but note that graphene-info makes this claim in the YT comments.

“driven by light (a commercial white LED in this case.)”


#427

I stand corrected. Once upon a time white LEDs wouldn’t have been cheap either but the growth in the lighting market has helped a lot there. You still need an electronic modulator though and the nonlinear nature of an LED’s output means, as they hint, that this needs to be pulse modulation (presumably PWM). That relies on an averaging process (presumably a thermal one) in the graphene which will determine a response time. I’d also be interested to know how well the thing works in the deep bass. Perhaps the nearest equivalent which is in regular use already is the plasma speaker. There are good reasons why these are limited to tweeter use.

VB


#428

#429

I was going to make a comment that it shouldn’t be that complicated as I nearly burnt a hole through the back of my head the other day when I found the torch feature on my new iphone.


#430

Nice enough, but they come a good deal bigger than that

I even built a baby one and ran it in my kitchen once upon a time

https://plus.google.com/photos/photo/103374440237412511927/5842242633046637202?authkey=COvmpeTnn7fHywE&sqid=101996609942925099701&ssid=1e945eae-283f-498d-8d95-9b254d6e4d23

Peta and I had to stop when the ozone started to choke us.

VB


#431

Witchcraft…


#432

When Paul Hollywood went through his Prog phase.


#433

Not fantastically interesting per se, but there is apparently a Kondo effect:-


#434

I knew it. Vindication at last :smiley:


#435

every home should have one :grinning:


#436

A Wee-G
https://www.gla.ac.uk/research/beacons/nanoquantum/wee-gglasgowsgravimeter/


#437

As yes, isn’t this is the experiment that Jim Al-Khalili is involved in? I’m sure he mentioned something relating to it in a BBC4 science doc.


#438

I read about it here http://www.ingenia.org.uk/Ingenia/Contents

The magazine of the Royal Academy of Engineering.


#439

More engineering than science but…


#440

the VW V5 has a single block and staggered pistons, so the W moniker seems fair enough.