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Index »
Regional/Local »
Elsewhere »
Science in the News
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Page: Previous 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Next |
ScottFromWyoming

Location: Powell Gender:  
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Posted:
May 30, 2011 - 7:27am |
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oldslabsides wrote:now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me. The depth of field is so shallow that it essentially is showing you just a cross-section of the half-a-bubble wave. Nearer to or further from the lens is out of focus so it doesn't show up.
Edit: well I was on the right track crack. Schleiren photography note the link from there to Collimated light
A do-it-yourself guide to Schlieren photography
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NoEnzLefttoSplit

Gender:  
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Posted:
May 30, 2011 - 6:47am |
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oldslabsides wrote:now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me. i think its because the wave will travel slower as it propagates out to the sides, kind of like waves turning the corner at the beach, presuming you have a beach with corners, that is..
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oldviolin

Location: esse quam videri Gender:  
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Posted:
May 30, 2011 - 6:41am |
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oldslabsides wrote: yes, but the contact lens has an edge in addition to its convex side...
who said anythin' about hatin'?
But I see the edge. Don't you? just rattling your cage...
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 6:36am |
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oldviolin wrote:
look at a contact lens from the side...any side, and it's the same. The shock wave is basicallythe same convex shape. maybe... stop hatin' on peoples horn bones will ya? yes, but the contact lens has an edge in addition to its convex side... who said anythin' about hatin'?
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beamends


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Posted:
May 30, 2011 - 6:35am |
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oldviolin wrote:
look at a contact lens from the side...any side, and it's the same. The shock wave is basicallythe same convex shape. maybe... stop hatin' on peoples horn bones will ya?
or the shock wave from an explosion, wherever you view from it's still dome shaped (in ideal conditions).
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oldviolin

Location: esse quam videri Gender:  
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Posted:
May 30, 2011 - 6:32am |
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oldslabsides wrote:now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me. look at a contact lens from the side...any side, and it's the same. The shock wave is basicallythe same convex shape. maybe... stop hatin' on peoples horn bones will ya?
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 6:19am |
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now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me.
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
Jan 26, 2011 - 6:45am |
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aflanigan wrote:Because they are better at grabbing the brass ring on the merry-go-round, of course!  Ah, but if we were based on right-handed amino acids would we have built merry-go-rounds that turn the other way?
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aflanigan

Location: At Sea Gender:  
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Posted:
Jan 26, 2011 - 6:39am |
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oldslabsides wrote: Because they are better at grabbing the brass ring on the merry-go-round, of course!
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
Jan 26, 2011 - 6:25am |
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HazzeSwede

Location: Hammerdal Gender:  
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Posted:
Dec 20, 2010 - 6:12am |
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duchamp

Location: Florida Panhandle Gender:  
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Posted:
Dec 20, 2010 - 6:11am |
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HazzeSwede wrote: ,,I'm having a funny feeling.... buzz wrote: The Big Fruitcake has been posting here for years.  ....................well, tell him tonight's the night.
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HazzeSwede

Location: Hammerdal Gender:  
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Posted:
Dec 20, 2010 - 6:03am |
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duchamp wrote: I hear all the lights go out and the Big Fruitcake arrives.
 ,,I'm having a funny feeling....
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buzz

Location: up the boohai 
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Posted:
Dec 20, 2010 - 6:03am |
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duchamp wrote: I hear all the lights go out and the Big Fruitcake arrives.
The Big Fruitcake has been posting here for years.
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duchamp

Location: Florida Panhandle Gender:  
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Posted:
Dec 20, 2010 - 6:01am |
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HazzeSwede wrote:I'm gonna stay under my blanket !!  ..never know's what's gonna happen !?  I hear all the lights go out and the Big Fruitcake arrives.
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HazzeSwede

Location: Hammerdal Gender:  
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Posted:
Dec 20, 2010 - 5:56am |
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hippiechick wrote: I'm gonna stay under my blanket !!  ..never know's what's gonna happen !?
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hippiechick

Location: topsy turvy land Gender:  
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Posted:
Dec 20, 2010 - 5:48am |
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beamends


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Posted:
Dec 3, 2010 - 8:40am |
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winter wrote:What does the bacterium currently think about life, and how does it anticipate a no-phosphorous diet will change its thinking?  Sources say they not very happy about government interference in their diet, but are essentially quite happy with a nice uncomplicated lifestyle. However, now that they have been noticed, they fear for their future, being non-conformists, and have actively started a research programme to investigate moving to a new planet. They acknowledge this presents a few hurdles, but anticipate a few million years of evolution will allow them to achieve their goal. As long as they don't have to listen to too many U2 tracks. Asked if they require any assistance with their plan, they replied that since they'd seen WIkileaks they'd rather get on with it themselves.
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winter

Location: in exile, as always Gender:  
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Posted:
Dec 3, 2010 - 8:29am |
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hippiechick wrote: What does the bacterium currently think about life, and how does it anticipate a no-phosphorous diet will change its thinking?
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musik_knut

Location: Third Stone From The Sun Gender:  
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Posted:
Dec 2, 2010 - 4:21pm |
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Umberdog wrote:Why does our government keep doing stuff like this? 20 September, 2010 Countercurrents.org On Wednesday, September 15, the United States Department of Energy conducted a subcritical nuclear explosive experiment under the NNSS (Nevada National Security Site) facility in Nevada formerly known as the Nevada Test Site. The subcritical test dubbed 'Bacchus' is the 24th such controversial 'almost' nuclear test whereby plutonium is bombarded by conventional explosives, short of blowing it up. The first subcritical test was conducted by the U.S. in 1997 and the most recent was 2006. The DOE is expected to give a 48 hour notice to the world community in advance of any full-scale subcritical test but it does not appear that this precedent was followed, and rather was completely disregarded. One Nevada activist group has indicated that they were on a list to get 48-hour notices but never received one. ...
The whole article... http://www.countercurrents.org/kishner200910.htm
The US is all over everyone else for stuff like this and here they go, setting the example again. I just don't get it.
Another article... http://nuclearhistory.wordpress.com/2010/09/21/usa-conducts-new-sub-critical-test-nevada-sept-20-2010/ It's called readiness. Same reason a grunt keeps his rifle squeaky clean.
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