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   Pico and ME  Sunday Jan 9 01:58 AM

Jan 9, 2011: Closer Look at Snow

Magnified, snow sometimes looks like a caricature of itself, or what snow might look like in a Tim Burton movie...but sometimes it doesn't look like itself at all.



More pictures here.



Pico and ME  Sunday Jan 9 02:00 AM

YIKES!
Please Mods...Fix the date. Thanks.



xoxoxoBruce  Sunday Jan 9 02:24 AM

It looks like snow that's been hanging around the gutter for a few days, all dingy and shit.


Thanks, ME, Pico should be proud.



SPUCK  Sunday Jan 9 06:38 AM

Punk snow.

Nice pics.



ajaccio  Sunday Jan 9 11:50 AM

Very cool photos at that link. Some of 'em look like toys that got left scattered over a playroom floor. Y'all should check out the photos of cocktails under a microscrope that are also featured at that same website. Psychadelic!



http://www.laboiteverte.fr/des-cocktails-au-microscope/



footfootfoot  Sunday Jan 9 12:54 PM

We visited similar photos several years ago...
http://www.cellar.org/showpost.php?p=126513

From here:
http://www.microscopy.fsu.edu/galleria/index.html



Sundae  Sunday Jan 9 01:14 PM

Gorgeous. But I have spent the weekend trying NOT to get a closer look at the snow here. As in not getting down to pavement level.



wolf  Sunday Jan 9 04:02 PM

I likes the snow.

Snow for my birthday. (yeah, it's today)

I may have mentioned before that I get snow every year for my birthday, well, +/-3 days, which means that I got some at -3, -1, and today, Cellar Snow. Looks good for +3 as well.



TheMercenary  Sunday Jan 9 05:42 PM

Great pics!



Beest  Wednesday Jan 12 03:31 PM

I saw this thread yesterday, just as the snow was starting, and sent the images to my colleagues, so we were inspired to have a go.

I didn't collect the snow and helped with getting the settings right for good pictures.

The first one is fromt he start of the storm when the flakes felt small and icy, the last two are from today when they were big and fluffy.



glatt  Wednesday Jan 12 03:36 PM

Awesome!

How much does a scanning electron microscope cost? I want one.



Pico and ME  Wednesday Jan 12 03:41 PM

So, those post/column-like things hold two 'snowflake' crystals together, I suppose.



Beest  Wednesday Jan 12 04:46 PM

Quote:
Originally Posted by Pico and ME View Post
So, those post/column-like things hold two 'snowflake' crystals together, I suppose.
I dunno, I don't make 'em.
I was surprised as there are some very simialr in the OP, especially the linked pictures, even the slit down the side.

you can get Little desktop SEM's now, I think they are about $80K.

If you know how to maintain them they often give the old ones away, I knew a guy who had one in his garage.


Lamplighter  Wednesday Jan 12 05:08 PM

Down memory lane... As a student I created mnemonic devises to help understand some things.

One I remember now, 50+ yrs later, about EM images is:
"a hole creates a shadow of brightness"

Is this field still doing the "gold" or other metal evaporations to make biological specimens visible with the EM ?
It was a tedious process, often ending in failure.



kerosene  Wednesday Jan 12 07:12 PM

Those are cool. That first one looks like one of those bank containers you use at the drive up window.



xoxoxoBruce  Thursday Jan 13 01:14 AM

Quote:
Originally Posted by Beest View Post
you can get Little desktop SEM's now, I think they are about $80K.
Um... no.

Thanks for the pictures, Beest, we like to keep those French honest.


SPUCK  Thursday Jan 13 06:44 AM

Beest; How can you do this with an EM, doesn't the flake melt instantly?



Beest  Thursday Jan 13 10:11 AM

Quote:
Originally Posted by SPUCK View Post
Beest; How can you do this with an EM, doesn't the flake melt instantly?
You chill the stage that the flake sits on, we have lot's of liquid nitrogen handy, and once it's in the EM it is in a vacuum so no heating by the air around it. The beam current is very low, pico amps, so nano Watts of heating power, not enough to melt them


xoxoxoBruce  Thursday Jan 13 10:22 AM

I should think a vacuum would make it change state very quickly.



glatt  Thursday Jan 13 10:22 AM

Quote:
Originally Posted by Beest View Post
If you know how to maintain them they often give the old ones away, I knew a guy who had one in his garage.
My dad (Physics prof at a small college) used to get tons of old equipment from Bell Labs this way.


SPUCK  Friday Jan 14 06:28 AM

Thanks Beest. I thought the beam currents were way higher. Prolly new sensors need way less.



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