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      CommentAuthorsquapple
    • CommentTimeOct 27th 2008 edited
     
    this is a collection of images taken from the photographer: Antonio Saba's Portfolio. I came across them at behance network and apparently they are from an upcoming book "one millionth of a second after the big bang"
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    I'll pop them in the photography thread as well ;)
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      CommentAuthormick
    • CommentTimeOct 28th 2008 edited
     
    hell, we unrolled about 100 meters of it, just to really grok the blue light. i'm fine and have no problems with the melted finger. :)

    that photo collection is wonderful, squapz. mesmerized me. thank you.
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      CommentAuthormick
    • CommentTimeOct 28th 2008
     
    shit be
    • CommentAuthorBiff
    • CommentTimeOct 30th 2008 edited
     
    Tape peeling makes the x-rays only if you use it in a vacuum.

    I'd think the vacuum would be harder on you than the xrays.
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      CommentAuthorsquapple
    • CommentTimeOct 30th 2008
     
    True, but dont the xrays leave the vacuum?
    • CommentAuthorBiff
    • CommentTimeOct 30th 2008
     
    They do leave the vacuum, but they have to be generated inside the vacuum. Pretty low exposure- the second time they did it, it was still only 5mrem/hour.
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      CommentAuthorsquapple
    • CommentTimeOct 30th 2008
     
    I'm not really familiar with the units / exposure, but a fascinating experiment though!

    Surely it will lead to excellent alternatives using adhesive like substances :)
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      CommentAuthormick
    • CommentTimeOct 30th 2008
     
    the xray pic was taken with the man's finger outside the vacuum. the vacuum only allowed the electrons to slow enough to actually emit the xrays.

    there's work to be done on this, i think. the first pics of the bone structure of the finger are a start. i can see it now.. a portable xray machine consisting of a vacuum chamber, a reel, and a backpack full of duct tape. :D

    it doesn't take high mrems to outline a bone. less is better, right?
    • CommentAuthorBiff
    • CommentTimeOct 31st 2008 edited
     
    It's less an issue of mrem, it's more an issue of energy/excitation.

    Most all gamma and neutron radiation will pass through a body after doing some ricochet action (the tenth thickness of a human is about 20", meaning it's got to pass through about 20" of meat for the radiation flux on the other side to be 1/10 of what is was entering). The gammas that pass through the meat make the film more opaque, the bone image is the less exposed film, as the tenth thickness of bone is somewhat less material for the 90% reduction. This reduction does affect the energy of each individual photon, but less than you'd expect. What's more affected is the number of gammas exiting the meat.

    It's all about the contrast!
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      CommentAuthormick
    • CommentTimeOct 31st 2008
     
    ^ what Biff said. *nod* absolutely right.

    i do think there's a potential for medical use. one of the tricks to bones is not the knowing whether the bone's broken, but whether you've got it realigned properly. lowtech, grainy xrays would be very helpful.
  11.  


    Piezoelectric materials are able to convert mechanical energy, such as a force imparted on the material by pressure, into electricity. Stressing the material under compression, tension, shear, or bending, will produce an output voltage. Piezoelectric materials have a broad range of applications and are commonly used as sensors; a small amount of mechanical energy can induce a large voltage that can be interpreted as a signal. They are also promising as energy harvesting devices for portable applications, whereby piezoelectrics might replace batteries for some devices.
    Certain crystals and ceramics are common piezoelectric materials, but there has been much interest in piezoelectric nanowires as of late. Researchers at Georgia Tech and the University of Dayton have created a small power generator that uses piezoelectric nanowires. The nanowires were aligned vertically and attached to a substrate at one end so that, like a tiny forest, they were free to move at the other end. ZnO fine-wires were used, and the substrate is a flexible Kapton polyimide film. When the wires are repeatedly stretched and then released, each nanowire creates an oscillating voltage of up to ~50 mV. The researchers think the nanowire generators could be useful for powering nanodevices.

    paper at nature

    via: nanoarchitecture.net
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      CommentAuthormick
    • CommentTimeNov 16th 2008
     
    *saved* i need to read later today. nano-work fascinates me. cool beans. :)

    i bookmarked that site, too, urb. nanoarchitecture sounds like a good resource.
  13.  
    mick said...*saved* i need to read later today. nano-work fascinates me. cool beans. :)
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      CommentAuthormick
    • CommentTimeNov 18th 2008 edited
     
    heee! perhaps there's a marketing scheme there. "nanotechnology water" sounds medicinal, doncha think?

    from what i understand from that article, there's a lot of promise in that strategy for powering simple nanomachines. it appears that they still have to be able to measure accurately a consistent refractory period, and i didn't see that they've yet found a way to llimit hysteresis. really encouraging, though. :)
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      CommentAuthorflak
    • CommentTimeNov 18th 2008
     
    You guys ever read about grey goo? Interesting stuff.
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      CommentAuthormick
    • CommentTimeNov 19th 2008
     
    yep. :)

    it's been a popular "sci fi" speculation, but when they figured out that the micromolecular buckyballs could glom together and form an impervious layer, it gave me a sense of presque vu.

    heh.. we have really hard water here, and it's full of iron bacteria. they leave a dark grey goo inside all the tanks and pipes. when i clean it, i always think of the "real" grey goo...... urg. wear gloves.


    here's a plain ol' nutzandboltz physics game. inclined planes and kinetic motion and gravity, oh my! try to launch a rocket.

    heh.. i strained MY tired little brain and finally managed a launch as a novice.

    Brainstrainer
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      CommentAuthorsquapple
    • CommentTimeNov 20th 2008
     
    Nice game, mick! I need to spend a bit of time of this!!!!!!
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      CommentAuthormick
    • CommentTimeNov 21st 2008
     
    yeah, i've not progressed, though i've found a couple more solutions on the novice level. it does take time.

    take a look at the sample; it demos how the different elements work. :) amusingly, the sample doesn't achieve launch.
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      CommentAuthormick
    • CommentTimeNov 24th 2008 edited
     
    ok, not strictly physics, but... chemistry is important, yes?




    Chemical Party

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