<article>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#article09_06_10_1544246</id>
	<title>First Acoustic Black Hole Created</title>
	<author>Soulskill</author>
	<datestamp>1244651400000</datestamp>
	<htmltext><a href="http://arxivblog.technologyreview.com/" rel="nofollow">KentuckyFC</a> writes <i>"One of the many curious properties of <a href="http://en.wikipedia.org/wiki/Bose\%E2\%80\%93Einstein\_condensate">Bose Einstein Condensates</a> (BECs) is that the flow of sound through them is governed by the same equations that describe how light is bent by a gravitational field. Now, a group of Israeli physicists have exploited this idea <a href="http://www.technologyreview.com/blog/arxiv/23625/">to create an acoustic black hole in a BEC</a>. The team created a supersonic flow of atoms within the BEC, a flow that prevents any phonon caught in it from making headway. The region where the flow changes from subsonic to supersonic is an event horizon, because any phonon unlucky enough to stray into the supersonic region can never escape. The real prize is not the acoustic black hole itself but what it makes possible: the first observation of <a href="http://en.wikipedia.org/wiki/Hawking\_radiation">Hawking radiation</a>. Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC. Were one of the pair to stray across the event horizon into the supersonic region, it could never escape. However, the other would be free to go on its way. This stream of phononic radiation away from an acoustic black hole would be the first observation of Hawking radiation. The team hasn't gotten that far yet, but it can't be long now before either they or their numerous competitors make this leap."</i></htmltext>
<tokenext>KentuckyFC writes " One of the many curious properties of Bose Einstein Condensates ( BECs ) is that the flow of sound through them is governed by the same equations that describe how light is bent by a gravitational field .
Now , a group of Israeli physicists have exploited this idea to create an acoustic black hole in a BEC .
The team created a supersonic flow of atoms within the BEC , a flow that prevents any phonon caught in it from making headway .
The region where the flow changes from subsonic to supersonic is an event horizon , because any phonon unlucky enough to stray into the supersonic region can never escape .
The real prize is not the acoustic black hole itself but what it makes possible : the first observation of Hawking radiation .
Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC .
Were one of the pair to stray across the event horizon into the supersonic region , it could never escape .
However , the other would be free to go on its way .
This stream of phononic radiation away from an acoustic black hole would be the first observation of Hawking radiation .
The team has n't gotten that far yet , but it ca n't be long now before either they or their numerous competitors make this leap .
"</tokentext>
<sentencetext>KentuckyFC writes "One of the many curious properties of Bose Einstein Condensates (BECs) is that the flow of sound through them is governed by the same equations that describe how light is bent by a gravitational field.
Now, a group of Israeli physicists have exploited this idea to create an acoustic black hole in a BEC.
The team created a supersonic flow of atoms within the BEC, a flow that prevents any phonon caught in it from making headway.
The region where the flow changes from subsonic to supersonic is an event horizon, because any phonon unlucky enough to stray into the supersonic region can never escape.
The real prize is not the acoustic black hole itself but what it makes possible: the first observation of Hawking radiation.
Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC.
Were one of the pair to stray across the event horizon into the supersonic region, it could never escape.
However, the other would be free to go on its way.
This stream of phononic radiation away from an acoustic black hole would be the first observation of Hawking radiation.
The team hasn't gotten that far yet, but it can't be long now before either they or their numerous competitors make this leap.
"</sentencetext>
</article>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28286913</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>Anonymous</author>
	<datestamp>1244635980000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>For a minute there, I couldn't figure out what you had against fish...</p></htmltext>
<tokenext>For a minute there , I could n't figure out what you had against fish.. .</tokentext>
<sentencetext>For a minute there, I couldn't figure out what you had against fish...</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28285537</id>
	<title>NO</title>
	<author>Anonymous</author>
	<datestamp>1244629560000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Pics or it didn't happen.</p></htmltext>
<tokenext>Pics or it did n't happen .</tokentext>
<sentencetext>Pics or it didn't happen.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282509</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>noidentity</author>
	<datestamp>1244660280000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I think the RIAA might be very interested in this, as they could finally prevent everyone from ever hearing music again.</htmltext>
<tokenext>I think the RIAA might be very interested in this , as they could finally prevent everyone from ever hearing music again .</tokentext>
<sentencetext>I think the RIAA might be very interested in this, as they could finally prevent everyone from ever hearing music again.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281441</id>
	<title>maybe we can use this to...</title>
	<author>pha7boy</author>
	<datestamp>1244656080000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext>I would hope we can use it to defend our civilization from both outside and inside attack. Maybe put a few of them in orbit that would suck in the drudgery of the reality shows and entertainment-news talking heads so that no outside civilization will feel the need to demolish the planet to build a hyperspace bypass. Plus, we won't have to listen/watch this crap anymore. A world without Fox/CNN/MSNBC... wow. I can only hope.</htmltext>
<tokenext>I would hope we can use it to defend our civilization from both outside and inside attack .
Maybe put a few of them in orbit that would suck in the drudgery of the reality shows and entertainment-news talking heads so that no outside civilization will feel the need to demolish the planet to build a hyperspace bypass .
Plus , we wo n't have to listen/watch this crap anymore .
A world without Fox/CNN/MSNBC... wow. I can only hope .</tokentext>
<sentencetext>I would hope we can use it to defend our civilization from both outside and inside attack.
Maybe put a few of them in orbit that would suck in the drudgery of the reality shows and entertainment-news talking heads so that no outside civilization will feel the need to demolish the planet to build a hyperspace bypass.
Plus, we won't have to listen/watch this crap anymore.
A world without Fox/CNN/MSNBC... wow. I can only hope.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281191</id>
	<title>And the news is where?</title>
	<author>Anonymous</author>
	<datestamp>1244655120000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext><p>I got a shot Bose amp here, and any sound you put in turns into silence. Voila, accustic black hole.</p><p>I'd sell this baby for cheap, too!</p></htmltext>
<tokenext>I got a shot Bose amp here , and any sound you put in turns into silence .
Voila , accustic black hole.I 'd sell this baby for cheap , too !</tokentext>
<sentencetext>I got a shot Bose amp here, and any sound you put in turns into silence.
Voila, accustic black hole.I'd sell this baby for cheap, too!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28286993</id>
	<title>Silent Hole</title>
	<author>Samah</author>
	<datestamp>1244636460000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Given that this is designed to trap phonons and not photons, should it not be called a "Silent Hole"? (No I didn't RTFA)</htmltext>
<tokenext>Given that this is designed to trap phonons and not photons , should it not be called a " Silent Hole " ?
( No I did n't RTFA )</tokentext>
<sentencetext>Given that this is designed to trap phonons and not photons, should it not be called a "Silent Hole"?
(No I didn't RTFA)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281263</id>
	<title>how about</title>
	<author>Anonymous</author>
	<datestamp>1244655420000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>sound bomb ? sound propulsion ? just gather sound in an acoustic black hole  then release it<nobr> <wbr></nobr>... could be for an interesting application ( if ever B-E can get bigger )</p></htmltext>
<tokenext>sound bomb ?
sound propulsion ?
just gather sound in an acoustic black hole then release it ... could be for an interesting application ( if ever B-E can get bigger )</tokentext>
<sentencetext>sound bomb ?
sound propulsion ?
just gather sound in an acoustic black hole  then release it ... could be for an interesting application ( if ever B-E can get bigger )</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281253</id>
	<title>From the tone of the description</title>
	<author>G3ckoG33k</author>
	<datestamp>1244655360000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>From the enthusiastic tone of the description, this sounds like Nobel Prize material.</p><p>Yet, I cannot judge it well enough.</p></htmltext>
<tokenext>From the enthusiastic tone of the description , this sounds like Nobel Prize material.Yet , I can not judge it well enough .</tokentext>
<sentencetext>From the enthusiastic tone of the description, this sounds like Nobel Prize material.Yet, I cannot judge it well enough.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28290193</id>
	<title>From the trombone section:</title>
	<author>Ripit</author>
	<datestamp>1244750640000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>The violas and second violins that sit in front of me want to know when a portable model is coming out. Thanks.</htmltext>
<tokenext>The violas and second violins that sit in front of me want to know when a portable model is coming out .
Thanks .</tokentext>
<sentencetext>The violas and second violins that sit in front of me want to know when a portable model is coming out.
Thanks.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281493</id>
	<title>Re:And the news is where?</title>
	<author>Anonymous</author>
	<datestamp>1244656320000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p><div class="quote"><p>I'd sell this baby for cheap, too!</p></div><p>Wow, this research is paying off already! Finally someone is selling a BOSE for what it's worth.</p></div>
	</htmltext>
<tokenext>I 'd sell this baby for cheap , too ! Wow , this research is paying off already !
Finally someone is selling a BOSE for what it 's worth .</tokentext>
<sentencetext>I'd sell this baby for cheap, too!Wow, this research is paying off already!
Finally someone is selling a BOSE for what it's worth.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281191</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28284233</id>
	<title>Pardon my ignorance, but...</title>
	<author>Locke2005</author>
	<datestamp>1244667480000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>WTF is a Phonon?</htmltext>
<tokenext>WTF is a Phonon ?</tokentext>
<sentencetext>WTF is a Phonon?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281581</id>
	<title>bah</title>
	<author>grub</author>
	<datestamp>1244656620000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><br>Motorhead could kill any wimpy acoustical black hole.</htmltext>
<tokenext>Motorhead could kill any wimpy acoustical black hole .</tokentext>
<sentencetext>Motorhead could kill any wimpy acoustical black hole.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281501</id>
	<title>Not the first Acoustic Black Hole</title>
	<author>GameGod0</author>
	<datestamp>1244656380000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>4</modscore>
	<htmltext>Black holes in a Bathtub by E. Berti (2005):<br>
www.iop.org/EJ/article/1742-6596/8/1/013/jpconf5\_8\_013.pdf<br> <br>

The argument basically goes that when you unplug your bathtub, there's a certain point at which waves generated past the "event horizon" near the hole never escape the hole. It's an interesting read, but I was under the impression that this is basically the same thing, albeit not an effect that arises from quantum field theory.</htmltext>
<tokenext>Black holes in a Bathtub by E. Berti ( 2005 ) : www.iop.org/EJ/article/1742-6596/8/1/013/jpconf5 \ _8 \ _013.pdf The argument basically goes that when you unplug your bathtub , there 's a certain point at which waves generated past the " event horizon " near the hole never escape the hole .
It 's an interesting read , but I was under the impression that this is basically the same thing , albeit not an effect that arises from quantum field theory .</tokentext>
<sentencetext>Black holes in a Bathtub by E. Berti (2005):
www.iop.org/EJ/article/1742-6596/8/1/013/jpconf5\_8\_013.pdf 

The argument basically goes that when you unplug your bathtub, there's a certain point at which waves generated past the "event horizon" near the hole never escape the hole.
It's an interesting read, but I was under the impression that this is basically the same thing, albeit not an effect that arises from quantum field theory.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28293065</id>
	<title>Been done before.</title>
	<author>Anonymous</author>
	<datestamp>1244732520000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>And we laughed at Maxwell Smart</p></htmltext>
<tokenext>And we laughed at Maxwell Smart</tokentext>
<sentencetext>And we laughed at Maxwell Smart</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282063</id>
	<title>Finally ... it's Cone of silence!</title>
	<author>Dragged Down by the</author>
	<datestamp>1244658420000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>Sorry about that, Chief.</htmltext>
<tokenext>Sorry about that , Chief .</tokentext>
<sentencetext>Sorry about that, Chief.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282885</id>
	<title>Phonon != Photon!</title>
	<author>Hurricane78</author>
	<datestamp>1244661960000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>2</modscore>
	<htmltext><p>How do you infer from the effects of phonons, that the same happens to photons? If they had the same effects, this would mean that luminiferous aether would exist. Which as far as we know, is not true, and replaced by the theory of relativity. Or would it be the effect of a quantized space-time? And would those quantums then be some kind of particles?</p><p>Or is the analogy just wrong, except for some subsets? ^^</p></htmltext>
<tokenext>How do you infer from the effects of phonons , that the same happens to photons ?
If they had the same effects , this would mean that luminiferous aether would exist .
Which as far as we know , is not true , and replaced by the theory of relativity .
Or would it be the effect of a quantized space-time ?
And would those quantums then be some kind of particles ? Or is the analogy just wrong , except for some subsets ?
^ ^</tokentext>
<sentencetext>How do you infer from the effects of phonons, that the same happens to photons?
If they had the same effects, this would mean that luminiferous aether would exist.
Which as far as we know, is not true, and replaced by the theory of relativity.
Or would it be the effect of a quantized space-time?
And would those quantums then be some kind of particles?Or is the analogy just wrong, except for some subsets?
^^</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282899</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>Anonymous</author>
	<datestamp>1244662020000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>2</modscore>
	<htmltext><p><div class="quote"><p>One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"</p></div><p>I really don't like that explanation... it makes it seem like the pressure differential is "known" to the gas inside the cylinder via some sort of acoustically-transmitted information. My initial reaction was "HUH" and my secondary reaction was "ok, I don't buy that."</p><p>After a little work on Google, I discovered that the effect really exists, but I think <a href="http://www.engsoft.co.kr/download\_e/steam\_flow\_e.htm#3.\%20Choked\%20Flow" title="engsoft.co.kr">this link describes it better (emphasis mine):</a> [engsoft.co.kr] </p><blockquote><div><p>However, once the downstream pressure reaches or is less than the critical pressure, the compressible mass flow rate does not increase even though the downstream pressure is decreased further.</p><p>This specific phenomenon is called as "choked flow", and <strong>the energy difference between the choked exit and ambient conditions is dissipated by shock wave and/or turbulence</strong>.</p></div></blockquote><p>Also, <a href="http://en.wikipedia.org/wiki/Choked\_flow#Thin-plate\_orifices" title="wikipedia.org">choked flow does not occur for thin-plate orifices</a> [wikipedia.org], which wouldn't make sense relative to the explanation as given by that prof. If the flow was really being limited by the non-propagation of information against a gas flowing at the speed of sound, the thickness of the plate shouldn't matter.</p></div>
	</htmltext>
<tokenext>One gas dynamics professor said I can think of it like this : " even though a higher pressure ratio creates a greater pressure potential difference , the gas inside the tank can not 'learn ' of the greater difference because that would require information to go * into * the tank , * against * the gas that is escaping at the speed of sound " I really do n't like that explanation... it makes it seem like the pressure differential is " known " to the gas inside the cylinder via some sort of acoustically-transmitted information .
My initial reaction was " HUH " and my secondary reaction was " ok , I do n't buy that .
" After a little work on Google , I discovered that the effect really exists , but I think this link describes it better ( emphasis mine ) : [ engsoft.co.kr ] However , once the downstream pressure reaches or is less than the critical pressure , the compressible mass flow rate does not increase even though the downstream pressure is decreased further.This specific phenomenon is called as " choked flow " , and the energy difference between the choked exit and ambient conditions is dissipated by shock wave and/or turbulence.Also , choked flow does not occur for thin-plate orifices [ wikipedia.org ] , which would n't make sense relative to the explanation as given by that prof. If the flow was really being limited by the non-propagation of information against a gas flowing at the speed of sound , the thickness of the plate should n't matter .</tokentext>
<sentencetext>One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"I really don't like that explanation... it makes it seem like the pressure differential is "known" to the gas inside the cylinder via some sort of acoustically-transmitted information.
My initial reaction was "HUH" and my secondary reaction was "ok, I don't buy that.
"After a little work on Google, I discovered that the effect really exists, but I think this link describes it better (emphasis mine): [engsoft.co.kr] However, once the downstream pressure reaches or is less than the critical pressure, the compressible mass flow rate does not increase even though the downstream pressure is decreased further.This specific phenomenon is called as "choked flow", and the energy difference between the choked exit and ambient conditions is dissipated by shock wave and/or turbulence.Also, choked flow does not occur for thin-plate orifices [wikipedia.org], which wouldn't make sense relative to the explanation as given by that prof. If the flow was really being limited by the non-propagation of information against a gas flowing at the speed of sound, the thickness of the plate shouldn't matter.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282075</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282589</id>
	<title>First Acoustic Black Hole Created</title>
	<author>Anonymous</author>
	<datestamp>1244660640000</datestamp>
	<modclass>None</modclass>
	<modscore>-1</modscore>
	<htmltext>This many comments no mention of goatse?</htmltext>
<tokenext>This many comments no mention of goatse ?</tokentext>
<sentencetext>This many comments no mention of goatse?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28283001</id>
	<title>Re:Not Hawking Radiation</title>
	<author>The Master Control P</author>
	<datestamp>1244662320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Bose-Einstein condensation is an exclusively quantum mechanical phenomenon; What do you mean the quantum effects may not be mirrored?</htmltext>
<tokenext>Bose-Einstein condensation is an exclusively quantum mechanical phenomenon ; What do you mean the quantum effects may not be mirrored ?</tokentext>
<sentencetext>Bose-Einstein condensation is an exclusively quantum mechanical phenomenon; What do you mean the quantum effects may not be mirrored?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281403</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28287061</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>rjmnz</author>
	<datestamp>1244636820000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p><div class="quote"><p>By the way, there's a similar, cheaper experiment you can do: pop a hole in a pressurized container.  The gas cannot escape it (at the outlet) faster than the local speed of sound, which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value.  One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"</p><p>Kind of like in the setup described in the article...</p></div><p>This is because at the fundamental level, sound is propagated by particle collisions.  The speed of sound (in a gas) is determined by particle velocity which is linked to temperature and particle mass.  Sound cannot move faster than the fastest particle (in a gas).  Pressure is irrelevant.<br>Sound in liquids and solids is another matter entirely.</p></div></div>
	</htmltext>
<tokenext>By the way , there 's a similar , cheaper experiment you can do : pop a hole in a pressurized container .
The gas can not escape it ( at the outlet ) faster than the local speed of sound , which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value .
One gas dynamics professor said I can think of it like this : " even though a higher pressure ratio creates a greater pressure potential difference , the gas inside the tank can not 'learn ' of the greater difference because that would require information to go * into * the tank , * against * the gas that is escaping at the speed of sound " Kind of like in the setup described in the article...This is because at the fundamental level , sound is propagated by particle collisions .
The speed of sound ( in a gas ) is determined by particle velocity which is linked to temperature and particle mass .
Sound can not move faster than the fastest particle ( in a gas ) .
Pressure is irrelevant.Sound in liquids and solids is another matter entirely .</tokentext>
<sentencetext>By the way, there's a similar, cheaper experiment you can do: pop a hole in a pressurized container.
The gas cannot escape it (at the outlet) faster than the local speed of sound, which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value.
One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"Kind of like in the setup described in the article...This is because at the fundamental level, sound is propagated by particle collisions.
The speed of sound (in a gas) is determined by particle velocity which is linked to temperature and particle mass.
Sound cannot move faster than the fastest particle (in a gas).
Pressure is irrelevant.Sound in liquids and solids is another matter entirely.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282075</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28283023</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>Hurricane78</author>
	<datestamp>1244662380000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>If you yell a lot at your black sound hole, until it cries, and "evaporates", does it create something that resembles a Disaster Area recording from 30 miles away, in an atomic bunker?</p></htmltext>
<tokenext>If you yell a lot at your black sound hole , until it cries , and " evaporates " , does it create something that resembles a Disaster Area recording from 30 miles away , in an atomic bunker ?</tokentext>
<sentencetext>If you yell a lot at your black sound hole, until it cries, and "evaporates", does it create something that resembles a Disaster Area recording from 30 miles away, in an atomic bunker?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281879</id>
	<title>I dont get it</title>
	<author>Anonymous</author>
	<datestamp>1244657820000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>The more i see and read off these quantum and string Theories the more i think Bullshit</p></htmltext>
<tokenext>The more i see and read off these quantum and string Theories the more i think Bullshit</tokentext>
<sentencetext>The more i see and read off these quantum and string Theories the more i think Bullshit</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</id>
	<title>Weaponize it and use it against car stereos.</title>
	<author>jeffb (2.718)</author>
	<datestamp>1244657100000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext>This could be even better than the "bass-seeking missile" that I've wanted to deploy for years.</htmltext>
<tokenext>This could be even better than the " bass-seeking missile " that I 've wanted to deploy for years .</tokentext>
<sentencetext>This could be even better than the "bass-seeking missile" that I've wanted to deploy for years.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281459</id>
	<title>I buy it</title>
	<author>oldhack</author>
	<datestamp>1244656200000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext>I need one of these for one of my neighbors.  Does it swallow people and dogs, too?  Cuz that'd be really good.</htmltext>
<tokenext>I need one of these for one of my neighbors .
Does it swallow people and dogs , too ?
Cuz that 'd be really good .</tokentext>
<sentencetext>I need one of these for one of my neighbors.
Does it swallow people and dogs, too?
Cuz that'd be really good.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282183</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>bsy\_at\_play</author>
	<datestamp>1244658960000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>heisenberg: uncertainty in energy times uncertainty in time has a lower bound.  what is the energy of the phonons?  given the small time that heisenberg allows the virtual phonon pairs to exist, how far can the phonons travel?  without actually working out the numbers, my seat of the pants guess is that the number of virtual phonon pairs for which one member crosses the acoustic event horizon will be vanishingly small.</p></htmltext>
<tokenext>heisenberg : uncertainty in energy times uncertainty in time has a lower bound .
what is the energy of the phonons ?
given the small time that heisenberg allows the virtual phonon pairs to exist , how far can the phonons travel ?
without actually working out the numbers , my seat of the pants guess is that the number of virtual phonon pairs for which one member crosses the acoustic event horizon will be vanishingly small .</tokentext>
<sentencetext>heisenberg: uncertainty in energy times uncertainty in time has a lower bound.
what is the energy of the phonons?
given the small time that heisenberg allows the virtual phonon pairs to exist, how far can the phonons travel?
without actually working out the numbers, my seat of the pants guess is that the number of virtual phonon pairs for which one member crosses the acoustic event horizon will be vanishingly small.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282049</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>Anonymous</author>
	<datestamp>1244658360000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Yes, everybody knows a black hole generator is a terrifying weapon. It does take its space from the heavy cruiser, though. I personally prefer tachyon beams and the like myself, lots of them. The Death Ray, however, it's just a waste of space.</p></htmltext>
<tokenext>Yes , everybody knows a black hole generator is a terrifying weapon .
It does take its space from the heavy cruiser , though .
I personally prefer tachyon beams and the like myself , lots of them .
The Death Ray , however , it 's just a waste of space .</tokentext>
<sentencetext>Yes, everybody knows a black hole generator is a terrifying weapon.
It does take its space from the heavy cruiser, though.
I personally prefer tachyon beams and the like myself, lots of them.
The Death Ray, however, it's just a waste of space.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281793</id>
	<title>Acoustic Black Hole?</title>
	<author>Anonymous</author>
	<datestamp>1244657460000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Doesn't this describe every song that James Taylor has published?</p></htmltext>
<tokenext>Does n't this describe every song that James Taylor has published ?</tokentext>
<sentencetext>Doesn't this describe every song that James Taylor has published?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28289465</id>
	<title>Re:And the news is where?</title>
	<author>Anonymous</author>
	<datestamp>1244656800000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>You get first post and it's not even a Goatse troll....geez.</htmltext>
<tokenext>You get first post and it 's not even a Goatse troll....geez .</tokentext>
<sentencetext>You get first post and it's not even a Goatse troll....geez.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281191</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281513</id>
	<title>this just goes to show</title>
	<author>Anonymous</author>
	<datestamp>1244656440000</datestamp>
	<modclass>Flamebait</modclass>
	<modscore>-1</modscore>
	<htmltext><p>You don't need morals to be intelligent, and intelligence doesn't give you morals.</p><p>I think all work that comes out of Israel should be ignored, and promising Israeli scientists should be invited to move to a non-racist Western country for them to be able to continue their work.</p></htmltext>
<tokenext>You do n't need morals to be intelligent , and intelligence does n't give you morals.I think all work that comes out of Israel should be ignored , and promising Israeli scientists should be invited to move to a non-racist Western country for them to be able to continue their work .</tokentext>
<sentencetext>You don't need morals to be intelligent, and intelligence doesn't give you morals.I think all work that comes out of Israel should be ignored, and promising Israeli scientists should be invited to move to a non-racist Western country for them to be able to continue their work.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282075</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>DriedClexler</author>
	<datestamp>1244658480000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>4</modscore>
	<htmltext><p><div class="quote"><p>That's somewhere in between a metaphor for Hawking Radiation and the real thing.</p></div><p>Not a physicist, but here's how I think the metaphor between the experiment and the real thing is supposed to work:</p><p>Speed of light: maximum speed information can travel through a vacuum ("the void")<br>Speed of sound: maximum speed information can travel through a medium composed of atoms ("substance")</p><p>(When aircraft go supersonic, the air they run into is incapable of "preparing" to be hit, in a manner of speaking...)</p><p>We can't create stuff that goes faster than the speed of light, but we can create stuff that goes faster than the speed of sound.  And just as you can't go fast enough to come back through an event horizon, information can't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary.  This shows us what it looks like to be in a situation like that of a black hole.</p><p>By the way, there's a similar, cheaper experiment you can do: pop a hole in a pressurized container.  The gas cannot escape it (at the outlet) faster than the local speed of sound, which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value.  One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"</p><p>Kind of like in the setup described in the article...</p></div>
	</htmltext>
<tokenext>That 's somewhere in between a metaphor for Hawking Radiation and the real thing.Not a physicist , but here 's how I think the metaphor between the experiment and the real thing is supposed to work : Speed of light : maximum speed information can travel through a vacuum ( " the void " ) Speed of sound : maximum speed information can travel through a medium composed of atoms ( " substance " ) ( When aircraft go supersonic , the air they run into is incapable of " preparing " to be hit , in a manner of speaking... ) We ca n't create stuff that goes faster than the speed of light , but we can create stuff that goes faster than the speed of sound .
And just as you ca n't go fast enough to come back through an event horizon , information ca n't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary .
This shows us what it looks like to be in a situation like that of a black hole.By the way , there 's a similar , cheaper experiment you can do : pop a hole in a pressurized container .
The gas can not escape it ( at the outlet ) faster than the local speed of sound , which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value .
One gas dynamics professor said I can think of it like this : " even though a higher pressure ratio creates a greater pressure potential difference , the gas inside the tank can not 'learn ' of the greater difference because that would require information to go * into * the tank , * against * the gas that is escaping at the speed of sound " Kind of like in the setup described in the article.. .</tokentext>
<sentencetext>That's somewhere in between a metaphor for Hawking Radiation and the real thing.Not a physicist, but here's how I think the metaphor between the experiment and the real thing is supposed to work:Speed of light: maximum speed information can travel through a vacuum ("the void")Speed of sound: maximum speed information can travel through a medium composed of atoms ("substance")(When aircraft go supersonic, the air they run into is incapable of "preparing" to be hit, in a manner of speaking...)We can't create stuff that goes faster than the speed of light, but we can create stuff that goes faster than the speed of sound.
And just as you can't go fast enough to come back through an event horizon, information can't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary.
This shows us what it looks like to be in a situation like that of a black hole.By the way, there's a similar, cheaper experiment you can do: pop a hole in a pressurized container.
The gas cannot escape it (at the outlet) faster than the local speed of sound, which is obtained whenever the ratio of pressure inside to pressure outside exceeds a critical value.
One gas dynamics professor said I can think of it like this: "even though a higher pressure ratio creates a greater pressure potential difference, the gas inside the tank cannot 'learn' of the greater difference because that would require information to go *into* the tank, *against* the gas that is escaping at the speed of sound"Kind of like in the setup described in the article...
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282121</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>Anonymous</author>
	<datestamp>1244658660000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>I'd be more interested in using it as a fish finder. *BOOM* the bass!</p></htmltext>
<tokenext>I 'd be more interested in using it as a fish finder .
* BOOM * the bass !</tokentext>
<sentencetext>I'd be more interested in using it as a fish finder.
*BOOM* the bass!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28294845</id>
	<title>Obsolete technology, I have a mute button</title>
	<author>TravisO</author>
	<datestamp>1244739060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>on my TV remote for past few decades!</p></htmltext>
<tokenext>on my TV remote for past few decades !</tokentext>
<sentencetext>on my TV remote for past few decades!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28288343</id>
	<title>Dear Scientists...</title>
	<author>EEGeek</author>
	<datestamp>1244646000000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Can you put this acoustic black hole around my girlfriend so I don't have to listen to her bitch at me anymore?</p></htmltext>
<tokenext>Can you put this acoustic black hole around my girlfriend so I do n't have to listen to her bitch at me anymore ?</tokentext>
<sentencetext>Can you put this acoustic black hole around my girlfriend so I don't have to listen to her bitch at me anymore?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281589</id>
	<title>What does it sound like?</title>
	<author>Lord Lode</author>
	<datestamp>1244656680000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>It must be "The Sound".</htmltext>
<tokenext>It must be " The Sound " .</tokentext>
<sentencetext>It must be "The Sound".</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281237</id>
	<title>Consumer applications</title>
	<author>Anonymous</author>
	<datestamp>1244655300000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I can't wait for the noise-cancelling headphones using this technology.</htmltext>
<tokenext>I ca n't wait for the noise-cancelling headphones using this technology .</tokentext>
<sentencetext>I can't wait for the noise-cancelling headphones using this technology.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282587</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>SleepingWaterBear</author>
	<datestamp>1244660640000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>That's somewhere in between a metaphor for Hawking Radiation and the real thing.</p></div><p>This isn't really a metaphor exactly.  If the equations governing two systems are the same, then we expect the behavior to be the same, and we can describe them in the same terms.  Phonons themselves are a good example of this: a phonon is hardly the sort of thing that you would intuitively think of as a particle, but because the equations governing phonons are the same as those governing quantum mechanical particles, physicists describe phonons as particles.  Subatomic particles themselves bear very little resemblance to the 'billiard ball' particles that most people imagine.  I think that it would be better to say that Hawking radiation is just an effect predicted for systems obeying certain equations, and in that sense, both the acoustic and traditional black holes exhibit completely real Hawking Radiation.</p><p>It is true that getting 'acoustic Hawking radiation' wouldn't constitute absolute proof that Black Holes do the same thing - our model may be wrong.  What it will do do is provide proof that, assuming our model is correct, Hawking radiation is real, and there isn't some unanticipated effect which invalidates the theory.</p></div>
	</htmltext>
<tokenext>That 's somewhere in between a metaphor for Hawking Radiation and the real thing.This is n't really a metaphor exactly .
If the equations governing two systems are the same , then we expect the behavior to be the same , and we can describe them in the same terms .
Phonons themselves are a good example of this : a phonon is hardly the sort of thing that you would intuitively think of as a particle , but because the equations governing phonons are the same as those governing quantum mechanical particles , physicists describe phonons as particles .
Subatomic particles themselves bear very little resemblance to the 'billiard ball ' particles that most people imagine .
I think that it would be better to say that Hawking radiation is just an effect predicted for systems obeying certain equations , and in that sense , both the acoustic and traditional black holes exhibit completely real Hawking Radiation.It is true that getting 'acoustic Hawking radiation ' would n't constitute absolute proof that Black Holes do the same thing - our model may be wrong .
What it will do do is provide proof that , assuming our model is correct , Hawking radiation is real , and there is n't some unanticipated effect which invalidates the theory .</tokentext>
<sentencetext>That's somewhere in between a metaphor for Hawking Radiation and the real thing.This isn't really a metaphor exactly.
If the equations governing two systems are the same, then we expect the behavior to be the same, and we can describe them in the same terms.
Phonons themselves are a good example of this: a phonon is hardly the sort of thing that you would intuitively think of as a particle, but because the equations governing phonons are the same as those governing quantum mechanical particles, physicists describe phonons as particles.
Subatomic particles themselves bear very little resemblance to the 'billiard ball' particles that most people imagine.
I think that it would be better to say that Hawking radiation is just an effect predicted for systems obeying certain equations, and in that sense, both the acoustic and traditional black holes exhibit completely real Hawking Radiation.It is true that getting 'acoustic Hawking radiation' wouldn't constitute absolute proof that Black Holes do the same thing - our model may be wrong.
What it will do do is provide proof that, assuming our model is correct, Hawking radiation is real, and there isn't some unanticipated effect which invalidates the theory.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28285991</id>
	<title>Re:Is it me or does this story scream Spinal Tap?</title>
	<author>Anonymous</author>
	<datestamp>1244631000000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>That's great, you could seriously hear a similarly braindead argument in audiophile shops.</p></htmltext>
<tokenext>That 's great , you could seriously hear a similarly braindead argument in audiophile shops .</tokentext>
<sentencetext>That's great, you could seriously hear a similarly braindead argument in audiophile shops.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281901</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282947</id>
	<title>Not so fast...</title>
	<author>fahrbot-bot</author>
	<datestamp>1244662140000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext>The <a href="http://www.mtv.com/" title="mtv.com">first Acoustic Black Hole</a> [mtv.com] was actually created back in 1981.</htmltext>
<tokenext>The first Acoustic Black Hole [ mtv.com ] was actually created back in 1981 .</tokentext>
<sentencetext>The first Acoustic Black Hole [mtv.com] was actually created back in 1981.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282307</id>
	<title>Re:Phonon ey?</title>
	<author>getuid()</author>
	<datestamp>1244659440000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>"Phonos" are basically "crystal oscillations". Enter the concept of "reciprocal space": it's basically the Fourier transform of the real 3D space, and is very commonly used in solid state physics.</p><p>Now as you probably know, a clean frequency (i.e. a sinus wave) in the time domain results to a single peak in the Fourier-Transform (i.e. in the frequency domain). And similar for phonons: a clean crystal oscillation (i.e. a single-frequency sound wave propagating through a medium) in 3D space results in the equivalent of a single, localized "particle" in reciprocal space: a phonon.</p></htmltext>
<tokenext>" Phonos " are basically " crystal oscillations " .
Enter the concept of " reciprocal space " : it 's basically the Fourier transform of the real 3D space , and is very commonly used in solid state physics.Now as you probably know , a clean frequency ( i.e .
a sinus wave ) in the time domain results to a single peak in the Fourier-Transform ( i.e .
in the frequency domain ) .
And similar for phonons : a clean crystal oscillation ( i.e .
a single-frequency sound wave propagating through a medium ) in 3D space results in the equivalent of a single , localized " particle " in reciprocal space : a phonon .</tokentext>
<sentencetext>"Phonos" are basically "crystal oscillations".
Enter the concept of "reciprocal space": it's basically the Fourier transform of the real 3D space, and is very commonly used in solid state physics.Now as you probably know, a clean frequency (i.e.
a sinus wave) in the time domain results to a single peak in the Fourier-Transform (i.e.
in the frequency domain).
And similar for phonons: a clean crystal oscillation (i.e.
a single-frequency sound wave propagating through a medium) in 3D space results in the equivalent of a single, localized "particle" in reciprocal space: a phonon.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281387</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281901</id>
	<title>Is it me or does this story scream Spinal Tap?</title>
	<author>revjtanton</author>
	<datestamp>1244657820000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext>"Nigel Tufnel: The numbers all go to eleven. Look, right across the board, eleven, eleven, eleven and...<br>
Marty DiBergi: Oh, I see. And most amps go up to ten?<br>
Nigel Tufnel: Exactly.<br>
Marty DiBergi: Does that mean it's louder? Is it any louder?<br>
Nigel Tufnel: Well, it's one louder, isn't it? It's not ten. You see, most blokes, you know, will be playing at ten. You're on ten here, all the way up, all the way up, all the way up, you're on ten on your guitar. Where can you go from there? Where?<br>
Marty DiBergi: I don't know.<br>
Nigel Tufnel: Nowhere. Exactly. What we do is, if we need that extra push over the cliff, you know what we do?<br>
Marty DiBergi: Put it up to eleven.<br>
Nigel Tufnel: Eleven. Exactly. One louder.<br>
Marty DiBergi: Why don't you just make ten louder and make ten be the top number and make that a little louder?<br>
Nigel Tufnel: [pause] These go to eleven." <br>
"Nigel Tufnel: It's like, how much more black could this be? and the answer is none. None more black. "</htmltext>
<tokenext>" Nigel Tufnel : The numbers all go to eleven .
Look , right across the board , eleven , eleven , eleven and.. . Marty DiBergi : Oh , I see .
And most amps go up to ten ?
Nigel Tufnel : Exactly .
Marty DiBergi : Does that mean it 's louder ?
Is it any louder ?
Nigel Tufnel : Well , it 's one louder , is n't it ?
It 's not ten .
You see , most blokes , you know , will be playing at ten .
You 're on ten here , all the way up , all the way up , all the way up , you 're on ten on your guitar .
Where can you go from there ?
Where ? Marty DiBergi : I do n't know .
Nigel Tufnel : Nowhere .
Exactly. What we do is , if we need that extra push over the cliff , you know what we do ?
Marty DiBergi : Put it up to eleven .
Nigel Tufnel : Eleven .
Exactly. One louder .
Marty DiBergi : Why do n't you just make ten louder and make ten be the top number and make that a little louder ?
Nigel Tufnel : [ pause ] These go to eleven .
" " Nigel Tufnel : It 's like , how much more black could this be ?
and the answer is none .
None more black .
"</tokentext>
<sentencetext>"Nigel Tufnel: The numbers all go to eleven.
Look, right across the board, eleven, eleven, eleven and...
Marty DiBergi: Oh, I see.
And most amps go up to ten?
Nigel Tufnel: Exactly.
Marty DiBergi: Does that mean it's louder?
Is it any louder?
Nigel Tufnel: Well, it's one louder, isn't it?
It's not ten.
You see, most blokes, you know, will be playing at ten.
You're on ten here, all the way up, all the way up, all the way up, you're on ten on your guitar.
Where can you go from there?
Where?
Marty DiBergi: I don't know.
Nigel Tufnel: Nowhere.
Exactly. What we do is, if we need that extra push over the cliff, you know what we do?
Marty DiBergi: Put it up to eleven.
Nigel Tufnel: Eleven.
Exactly. One louder.
Marty DiBergi: Why don't you just make ten louder and make ten be the top number and make that a little louder?
Nigel Tufnel: [pause] These go to eleven.
" 
"Nigel Tufnel: It's like, how much more black could this be?
and the answer is none.
None more black.
"</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281929</id>
	<title>Great</title>
	<author>Anonymous</author>
	<datestamp>1244657940000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext>Sweet, now I just have to trick my wife into standing in it.. ah peace</htmltext>
<tokenext>Sweet , now I just have to trick my wife into standing in it.. ah peace</tokentext>
<sentencetext>Sweet, now I just have to trick my wife into standing in it.. ah peace</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282585</id>
	<title>Acoustic black hole...</title>
	<author>Anonymous</author>
	<datestamp>1244660580000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext>Isn't that the name of the new Britney Spears album?</htmltext>
<tokenext>Is n't that the name of the new Britney Spears album ?</tokentext>
<sentencetext>Isn't that the name of the new Britney Spears album?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281403</id>
	<title>Not Hawking Radiation</title>
	<author>Big\_Breaker</author>
	<datestamp>1244655960000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>3</modscore>
	<htmltext><p>There is an analogy there in the macro physics but that doesn't mean the small scale stuff like QM will be mirrored.</p><p>You can model gravity in the orbital mechanics sense with a marble and vertical cone that tapers at 1/square(height).  That doesn't mean it will do anything relativistic or quantum mechanical.</p></htmltext>
<tokenext>There is an analogy there in the macro physics but that does n't mean the small scale stuff like QM will be mirrored.You can model gravity in the orbital mechanics sense with a marble and vertical cone that tapers at 1/square ( height ) .
That does n't mean it will do anything relativistic or quantum mechanical .</tokentext>
<sentencetext>There is an analogy there in the macro physics but that doesn't mean the small scale stuff like QM will be mirrored.You can model gravity in the orbital mechanics sense with a marble and vertical cone that tapers at 1/square(height).
That doesn't mean it will do anything relativistic or quantum mechanical.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28283369</id>
	<title>This gives me an idea!</title>
	<author>caywen</author>
	<datestamp>1244664000000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Ooh, this gives me a great idea on how to attack the Vatican! Much simpler than stealing antimatter from the LHC.</htmltext>
<tokenext>Ooh , this gives me a great idea on how to attack the Vatican !
Much simpler than stealing antimatter from the LHC .</tokentext>
<sentencetext>Ooh, this gives me a great idea on how to attack the Vatican!
Much simpler than stealing antimatter from the LHC.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282955</id>
	<title>Re:From the tone of the description</title>
	<author>clone53421</author>
	<datestamp>1244662200000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>That's because the dronons were captured in the black hole, while the excitons weren't. What you've just experienced is the first known observation of Hawkings elation.</p></htmltext>
<tokenext>That 's because the dronons were captured in the black hole , while the excitons were n't .
What you 've just experienced is the first known observation of Hawkings elation .</tokentext>
<sentencetext>That's because the dronons were captured in the black hole, while the excitons weren't.
What you've just experienced is the first known observation of Hawkings elation.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281253</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28283919</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>shma</author>
	<datestamp>1244666280000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>We can't create stuff that goes faster than the speed of light, but we can create stuff that goes faster than the speed of sound. And just as you can't go fast enough to come back through an event horizon, information can't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary. This shows us what it looks like to be in a situation like that of a black hole.</p></div><p>That's exactly right. What they have done is create an acoustic event horizon. It doesn't hold all the same properties as a real black hole, but as Korn says, there is a chance that you can see Hawking Radiation and possibly BH evaporation from this experiment. There has already been <a href="http://arxiv.org/PS\_cache/arxiv/pdf/0711/0711.4520v2.pdf" title="arxiv.org">a paper</a> [arxiv.org] suggesting that you can see Hawking radiation by looking at the density correlation functions of the BEC.</p></div>
	</htmltext>
<tokenext>We ca n't create stuff that goes faster than the speed of light , but we can create stuff that goes faster than the speed of sound .
And just as you ca n't go fast enough to come back through an event horizon , information ca n't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary .
This shows us what it looks like to be in a situation like that of a black hole.That 's exactly right .
What they have done is create an acoustic event horizon .
It does n't hold all the same properties as a real black hole , but as Korn says , there is a chance that you can see Hawking Radiation and possibly BH evaporation from this experiment .
There has already been a paper [ arxiv.org ] suggesting that you can see Hawking radiation by looking at the density correlation functions of the BEC .</tokentext>
<sentencetext>We can't create stuff that goes faster than the speed of light, but we can create stuff that goes faster than the speed of sound.
And just as you can't go fast enough to come back through an event horizon, information can't propagate fast enough in the experiment to go back across the subsonic/supersonic boundary.
This shows us what it looks like to be in a situation like that of a black hole.That's exactly right.
What they have done is create an acoustic event horizon.
It doesn't hold all the same properties as a real black hole, but as Korn says, there is a chance that you can see Hawking Radiation and possibly BH evaporation from this experiment.
There has already been a paper [arxiv.org] suggesting that you can see Hawking radiation by looking at the density correlation functions of the BEC.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282075</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28284095</id>
	<title>silence is golden</title>
	<author>flahwho</author>
	<datestamp>1244666880000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>now if i could only put my wife, kids and boss in it</htmltext>
<tokenext>now if i could only put my wife , kids and boss in it</tokentext>
<sentencetext>now if i could only put my wife, kids and boss in it</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282735</id>
	<title>Re:Phonon ey?</title>
	<author>phantomfive</author>
	<datestamp>1244661180000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Yeah, it kind of ruins that whole debate about 'is light a particle or a wave', doesn't it?  Even a sound wave is just a bunch of particles.  Wish I had thought of that earlier.....</htmltext>
<tokenext>Yeah , it kind of ruins that whole debate about 'is light a particle or a wave ' , does n't it ?
Even a sound wave is just a bunch of particles .
Wish I had thought of that earlier.... .</tokentext>
<sentencetext>Yeah, it kind of ruins that whole debate about 'is light a particle or a wave', doesn't it?
Even a sound wave is just a bunch of particles.
Wish I had thought of that earlier.....</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281387</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28290679</id>
	<title>Re:Not the first Acoustic Black Hole</title>
	<author>Anonymous</author>
	<datestamp>1244713800000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>The bathtub analogy is a classical one, while the BEC is a quantum one. In the former case, sound waves exhibit only classical effects, while in the latter also quantum effects.</p></htmltext>
<tokenext>The bathtub analogy is a classical one , while the BEC is a quantum one .
In the former case , sound waves exhibit only classical effects , while in the latter also quantum effects .</tokentext>
<sentencetext>The bathtub analogy is a classical one, while the BEC is a quantum one.
In the former case, sound waves exhibit only classical effects, while in the latter also quantum effects.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281501</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282181</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>spydum</author>
	<datestamp>1244658960000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I tried to process this statement a few times trying to comprehend why you were shooting fish with missles. Guess I'll learn to read the subject..</htmltext>
<tokenext>I tried to process this statement a few times trying to comprehend why you were shooting fish with missles .
Guess I 'll learn to read the subject. .</tokentext>
<sentencetext>I tried to process this statement a few times trying to comprehend why you were shooting fish with missles.
Guess I'll learn to read the subject..</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28285919</id>
	<title>what would happen...</title>
	<author>Fuzzums</author>
	<datestamp>1244630760000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext><p>we all know photon pairs are connected. an observation on changes the state of the other. (quantum entanglement) but what happens if one of a pair of photons enters a black hole and the other remains outside?</p><p>does quantum entanglement still exist fo these photons? does the photon still exist inside the black hole or does it disintegrate or change state? if so: what would happen to the other photon outside?</p><p>i call whatever will happen the Fuzzums effect<nobr> <wbr></nobr>;)</p></htmltext>
<tokenext>we all know photon pairs are connected .
an observation on changes the state of the other .
( quantum entanglement ) but what happens if one of a pair of photons enters a black hole and the other remains outside ? does quantum entanglement still exist fo these photons ?
does the photon still exist inside the black hole or does it disintegrate or change state ?
if so : what would happen to the other photon outside ? i call whatever will happen the Fuzzums effect ; )</tokentext>
<sentencetext>we all know photon pairs are connected.
an observation on changes the state of the other.
(quantum entanglement) but what happens if one of a pair of photons enters a black hole and the other remains outside?does quantum entanglement still exist fo these photons?
does the photon still exist inside the black hole or does it disintegrate or change state?
if so: what would happen to the other photon outside?i call whatever will happen the Fuzzums effect ;)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281621</id>
	<title>Dudley?</title>
	<author>Anonymous</author>
	<datestamp>1244656800000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Hmm, wonder if it might be Dudley Bose?

(c'mon, I can't be the only Hamilton fan around. sucky audio equipment is not the only type of Bose!)</htmltext>
<tokenext>Hmm , wonder if it might be Dudley Bose ?
( c'mon , I ca n't be the only Hamilton fan around .
sucky audio equipment is not the only type of Bose !
)</tokentext>
<sentencetext>Hmm, wonder if it might be Dudley Bose?
(c'mon, I can't be the only Hamilton fan around.
sucky audio equipment is not the only type of Bose!
)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281585</id>
	<title>Acoustic Black Hole</title>
	<author>ronfuller</author>
	<datestamp>1244656680000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext>now we know how they made the "cone of silence"

<a href="http://en.wikipedia.org/wiki/Cone\_of\_Silence" title="wikipedia.org" rel="nofollow">http://en.wikipedia.org/wiki/Cone\_of\_Silence</a> [wikipedia.org]</htmltext>
<tokenext>now we know how they made the " cone of silence " http : //en.wikipedia.org/wiki/Cone \ _of \ _Silence [ wikipedia.org ]</tokentext>
<sentencetext>now we know how they made the "cone of silence"

http://en.wikipedia.org/wiki/Cone\_of\_Silence [wikipedia.org]</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281233</id>
	<title>So...Bose sucks?</title>
	<author>brouski</author>
	<datestamp>1244655300000</datestamp>
	<modclass>Troll</modclass>
	<modscore>-1</modscore>
	<htmltext>Hardly a revolutionary finding, is it?<br>
<br>
Admit it, you came here to post the same thing.</htmltext>
<tokenext>Hardly a revolutionary finding , is it ?
Admit it , you came here to post the same thing .</tokentext>
<sentencetext>Hardly a revolutionary finding, is it?
Admit it, you came here to post the same thing.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281201</id>
	<title>I guess this proves...</title>
	<author>thewiz</author>
	<datestamp>1244655180000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext><p>that in space, no one can hear you scre...</p></htmltext>
<tokenext>that in space , no one can hear you scre.. .</tokentext>
<sentencetext>that in space, no one can hear you scre...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28283041</id>
	<title>Black hole?</title>
	<author>clone53421</author>
	<datestamp>1244662560000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>If it traps sound instead of light, shouldn't it be called a silent hole instead?</p></htmltext>
<tokenext>If it traps sound instead of light , should n't it be called a silent hole instead ?</tokentext>
<sentencetext>If it traps sound instead of light, shouldn't it be called a silent hole instead?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281387</id>
	<title>Phonon ey?</title>
	<author>Snowblindeye</author>
	<datestamp>1244655900000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>4</modscore>
	<htmltext><p>I knew light was quantized, but I had seriously never heard of Phonons, or that sound can be quantized as well.</p><p>Well, apparently it can: <a href="http://en.wikipedia.org/w/index.php?title=Phonon&amp;oldid=292678374" title="wikipedia.org">Phonon</a> [wikipedia.org] </p></htmltext>
<tokenext>I knew light was quantized , but I had seriously never heard of Phonons , or that sound can be quantized as well.Well , apparently it can : Phonon [ wikipedia.org ]</tokentext>
<sentencetext>I knew light was quantized, but I had seriously never heard of Phonons, or that sound can be quantized as well.Well, apparently it can: Phonon [wikipedia.org] </sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282753</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>T Murphy</author>
	<datestamp>1244661240000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>In the meantime you can do what I do. When an overly loud car pulls up next to you, blast the news at them.</htmltext>
<tokenext>In the meantime you can do what I do .
When an overly loud car pulls up next to you , blast the news at them .</tokentext>
<sentencetext>In the meantime you can do what I do.
When an overly loud car pulls up next to you, blast the news at them.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281819</id>
	<title>Re:And the news is where?</title>
	<author>Anonymous</author>
	<datestamp>1244657580000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>What happens when they shut the thing off - do you suddenly hear all the sound that got gobbled up??</p></htmltext>
<tokenext>What happens when they shut the thing off - do you suddenly hear all the sound that got gobbled up ?
?</tokentext>
<sentencetext>What happens when they shut the thing off - do you suddenly hear all the sound that got gobbled up?
?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281191</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281331</id>
	<title>86 says</title>
	<author>Anonymous</author>
	<datestamp>1244655720000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p>Let's use the cone of silence, chief!</p></htmltext>
<tokenext>Let 's use the cone of silence , chief !</tokentext>
<sentencetext>Let's use the cone of silence, chief!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28294813</id>
	<title>Re:Great</title>
	<author>Anonymous</author>
	<datestamp>1244738940000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Seems to me that you'd have to listen to half the things she said rather than the quarter that you do now.</p></htmltext>
<tokenext>Seems to me that you 'd have to listen to half the things she said rather than the quarter that you do now .</tokentext>
<sentencetext>Seems to me that you'd have to listen to half the things she said rather than the quarter that you do now.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281929</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282117</id>
	<title>Re:From the tone of the description</title>
	<author>ShieldW0lf</author>
	<datestamp>1244658600000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>3</modscore>
	<htmltext>Here, I'll fix it.<br> <br>
The real prize is not the acoustic black hole itself but what it <b>might</b> makes possible: the first observation of <b>something analogous to</b> Hawking radiation. <b>The Theory of </b>Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC.  <b>Theoretically,</b> were one of the pair to stray across the event horizon into the supersonic region, it could never escape. However, the other would be free to go on its way.  This stream of phononic radiation away from an acoustic black hole would be the first observation of <b>anything even vaguely resembling</b> Hawking radiation.  The team hasn't actually achieved any of this though.  It can't be long now before they or their numerous competitors make this leap.  Unless their hypothesis is totally wrong, which is entirely possible.  But that doesn't sound particularly impressive, so we'll just forget about that bit...</htmltext>
<tokenext>Here , I 'll fix it .
The real prize is not the acoustic black hole itself but what it might makes possible : the first observation of something analogous to Hawking radiation .
The Theory of Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC .
Theoretically , were one of the pair to stray across the event horizon into the supersonic region , it could never escape .
However , the other would be free to go on its way .
This stream of phononic radiation away from an acoustic black hole would be the first observation of anything even vaguely resembling Hawking radiation .
The team has n't actually achieved any of this though .
It ca n't be long now before they or their numerous competitors make this leap .
Unless their hypothesis is totally wrong , which is entirely possible .
But that does n't sound particularly impressive , so we 'll just forget about that bit.. .</tokentext>
<sentencetext>Here, I'll fix it.
The real prize is not the acoustic black hole itself but what it might makes possible: the first observation of something analogous to Hawking radiation.
The Theory of Quantum mechanics predicts that pairs of phonons with opposite momentum ought to be constantly springing in and out of existence in a BEC.
Theoretically, were one of the pair to stray across the event horizon into the supersonic region, it could never escape.
However, the other would be free to go on its way.
This stream of phononic radiation away from an acoustic black hole would be the first observation of anything even vaguely resembling Hawking radiation.
The team hasn't actually achieved any of this though.
It can't be long now before they or their numerous competitors make this leap.
Unless their hypothesis is totally wrong, which is entirely possible.
But that doesn't sound particularly impressive, so we'll just forget about that bit...</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281253</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28284447</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>ardle</author>
	<datestamp>1244625000000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>it would be a nice demonstration if they were to get it to work</p></div><p>One thing that would demonstrate is that the mathematics is valid. It's a bit like like trying to run a Java program on different JVMs<nobr> <wbr></nobr>;-)</p></div>
	</htmltext>
<tokenext>it would be a nice demonstration if they were to get it to workOne thing that would demonstrate is that the mathematics is valid .
It 's a bit like like trying to run a Java program on different JVMs ; - )</tokentext>
<sentencetext>it would be a nice demonstration if they were to get it to workOne thing that would demonstrate is that the mathematics is valid.
It's a bit like like trying to run a Java program on different JVMs ;-)
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28286319</id>
	<title>Re:DONT DO IT SCIENTISTS!</title>
	<author>dissy</author>
	<datestamp>1244632560000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>You'll create a BLACK HOLE that ENGULFS THE EARTH! Just like the LHC!</p></div><p>So *THAT'S* what happened!  I've been wondering why my clothes felt tighter these past few weeks...</p></div>
	</htmltext>
<tokenext>You 'll create a BLACK HOLE that ENGULFS THE EARTH !
Just like the LHC ! So * THAT 'S * what happened !
I 've been wondering why my clothes felt tighter these past few weeks.. .</tokentext>
<sentencetext>You'll create a BLACK HOLE that ENGULFS THE EARTH!
Just like the LHC!So *THAT'S* what happened!
I've been wondering why my clothes felt tighter these past few weeks...
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281517</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28291763</id>
	<title>Re:And the news is where?</title>
	<author>physburn</author>
	<datestamp>1244727660000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>This is so cool. First of all I want this stuff for cavity insulation in my flat.
Then I can play music all night without next door complaining.

Having said that the BEC stuff might be either very loud or very hot, depend
on the frequency spectrum it emits, BEC loudspeakers might be possible
by varing the heat input to the supersonic regions.

However since the apparatus only hold a tiny ammount of rubidium atom, in
a magnetic trap. It might be long time before its practice.</htmltext>
<tokenext>This is so cool .
First of all I want this stuff for cavity insulation in my flat .
Then I can play music all night without next door complaining .
Having said that the BEC stuff might be either very loud or very hot , depend on the frequency spectrum it emits , BEC loudspeakers might be possible by varing the heat input to the supersonic regions .
However since the apparatus only hold a tiny ammount of rubidium atom , in a magnetic trap .
It might be long time before its practice .</tokentext>
<sentencetext>This is so cool.
First of all I want this stuff for cavity insulation in my flat.
Then I can play music all night without next door complaining.
Having said that the BEC stuff might be either very loud or very hot, depend
on the frequency spectrum it emits, BEC loudspeakers might be possible
by varing the heat input to the supersonic regions.
However since the apparatus only hold a tiny ammount of rubidium atom, in
a magnetic trap.
It might be long time before its practice.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281191</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281223</id>
	<title>at last, the dream is realized!</title>
	<author>Tumbleweed</author>
	<datestamp>1244655240000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p>"In one ear and out the other."</p></htmltext>
<tokenext>" In one ear and out the other .
"</tokentext>
<sentencetext>"In one ear and out the other.
"</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28287715</id>
	<title>Re:Sort of Hawking Radiation</title>
	<author>node 3</author>
	<datestamp>1244641620000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>I really don't like that explanation... it makes it seem like the pressure differential is "known" to the gas inside the cylinder via some sort of acoustically-transmitted information. My initial reaction was "HUH" and my secondary reaction was "ok, I don't buy that."</p></div><p>That's <i>almost</i> what he's saying. He's not saying there is <i>acoustically</i>-transmitted information, but that there is <i>physically</i> transmitted information.</p><p>Imagine you are inside the container. If you measure how much air is leaving the container, you have access to all the information required to know the pressure of the outside. At a certain point, the pressure of the outside <i>has no further effect</i> on the flow, so <i>inside</i> of the container, no further information about the outside is possible. You only know that the pressure is equal to or less than some specific amount. So while the external pressure is changing, <i>no information</i> about that fact is making its way into the container!</p><p>So the physical/mechanical transfer of information cannot exceed the speed of sound in this system, and if the air is leaving at the speed of sound, trying to go backwards at the speed of sound results in a net speed of zero. It's not that the container "knows" something in a "it comprehends the ideas of", but "knows" in that it contains within it that specific piece of information. It's used similar to how your computer "knows" what you are typing on the keyboard, but not that it "understands" what you are typing. And to extend the analogy a bit further, if your keyboard buffer fills, it can no longer "know" what you are typing, as that information is coming in faster than the computer (specifically the keyboard controller) is capable of processing it.</p></div>
	</htmltext>
<tokenext>I really do n't like that explanation... it makes it seem like the pressure differential is " known " to the gas inside the cylinder via some sort of acoustically-transmitted information .
My initial reaction was " HUH " and my secondary reaction was " ok , I do n't buy that .
" That 's almost what he 's saying .
He 's not saying there is acoustically-transmitted information , but that there is physically transmitted information.Imagine you are inside the container .
If you measure how much air is leaving the container , you have access to all the information required to know the pressure of the outside .
At a certain point , the pressure of the outside has no further effect on the flow , so inside of the container , no further information about the outside is possible .
You only know that the pressure is equal to or less than some specific amount .
So while the external pressure is changing , no information about that fact is making its way into the container ! So the physical/mechanical transfer of information can not exceed the speed of sound in this system , and if the air is leaving at the speed of sound , trying to go backwards at the speed of sound results in a net speed of zero .
It 's not that the container " knows " something in a " it comprehends the ideas of " , but " knows " in that it contains within it that specific piece of information .
It 's used similar to how your computer " knows " what you are typing on the keyboard , but not that it " understands " what you are typing .
And to extend the analogy a bit further , if your keyboard buffer fills , it can no longer " know " what you are typing , as that information is coming in faster than the computer ( specifically the keyboard controller ) is capable of processing it .</tokentext>
<sentencetext>I really don't like that explanation... it makes it seem like the pressure differential is "known" to the gas inside the cylinder via some sort of acoustically-transmitted information.
My initial reaction was "HUH" and my secondary reaction was "ok, I don't buy that.
"That's almost what he's saying.
He's not saying there is acoustically-transmitted information, but that there is physically transmitted information.Imagine you are inside the container.
If you measure how much air is leaving the container, you have access to all the information required to know the pressure of the outside.
At a certain point, the pressure of the outside has no further effect on the flow, so inside of the container, no further information about the outside is possible.
You only know that the pressure is equal to or less than some specific amount.
So while the external pressure is changing, no information about that fact is making its way into the container!So the physical/mechanical transfer of information cannot exceed the speed of sound in this system, and if the air is leaving at the speed of sound, trying to go backwards at the speed of sound results in a net speed of zero.
It's not that the container "knows" something in a "it comprehends the ideas of", but "knows" in that it contains within it that specific piece of information.
It's used similar to how your computer "knows" what you are typing on the keyboard, but not that it "understands" what you are typing.
And to extend the analogy a bit further, if your keyboard buffer fills, it can no longer "know" what you are typing, as that information is coming in faster than the computer (specifically the keyboard controller) is capable of processing it.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282899</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281245</id>
	<title>Sort of Hawking Radiation</title>
	<author>Anonymous</author>
	<datestamp>1244655360000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><p>That's somewhere in between a metaphor for Hawking Radiation and the real thing.  It's not true HR, but it would be a nice demonstration if they were to get it to work, especially if they could show some sort of analog to black hole "evaporation," which is the main implication of HR.  I suppose that should naturally happen as the separation of the pairs sucks energy from the BEC and slows the fluid inside, shrinking the event-horizon-analogue.</p><p>Also, let's get properly flowing BEC layers in our noise canceling headphones!</p></htmltext>
<tokenext>That 's somewhere in between a metaphor for Hawking Radiation and the real thing .
It 's not true HR , but it would be a nice demonstration if they were to get it to work , especially if they could show some sort of analog to black hole " evaporation , " which is the main implication of HR .
I suppose that should naturally happen as the separation of the pairs sucks energy from the BEC and slows the fluid inside , shrinking the event-horizon-analogue.Also , let 's get properly flowing BEC layers in our noise canceling headphones !</tokentext>
<sentencetext>That's somewhere in between a metaphor for Hawking Radiation and the real thing.
It's not true HR, but it would be a nice demonstration if they were to get it to work, especially if they could show some sort of analog to black hole "evaporation," which is the main implication of HR.
I suppose that should naturally happen as the separation of the pairs sucks energy from the BEC and slows the fluid inside, shrinking the event-horizon-analogue.Also, let's get properly flowing BEC layers in our noise canceling headphones!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281827</id>
	<title>I had an acoustic black hole before...</title>
	<author>damn\_registrars</author>
	<datestamp>1244657640000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>... back in the 90s, but then the local top40 station started playing boy bands nonstop and my black hole was, itself, pulled into the resulting immense vacuum.</htmltext>
<tokenext>... back in the 90s , but then the local top40 station started playing boy bands nonstop and my black hole was , itself , pulled into the resulting immense vacuum .</tokentext>
<sentencetext>... back in the 90s, but then the local top40 station started playing boy bands nonstop and my black hole was, itself, pulled into the resulting immense vacuum.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28282693</id>
	<title>Re:Weaponize it and use it against car stereos.</title>
	<author>StikyPad</author>
	<datestamp>1244661000000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext><p>I'm bassuming there's an unintended 'B' in that sentence..</p></htmltext>
<tokenext>I 'm bassuming there 's an unintended 'B ' in that sentence. .</tokentext>
<sentencetext>I'm bassuming there's an unintended 'B' in that sentence..</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281711</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281317</id>
	<title>Doppler Shift?</title>
	<author>Anonymous</author>
	<datestamp>1244655660000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>1</modscore>
	<htmltext><p>I think it would be interesting to see a 3D graph of the magnitude of a 'chirp' sent across the "black hole" and compare it with doppler shift equations, and then overlay that with a graph of purposed light behaviors about a black hole. Experimental proof vs mathematical?</p></htmltext>
<tokenext>I think it would be interesting to see a 3D graph of the magnitude of a 'chirp ' sent across the " black hole " and compare it with doppler shift equations , and then overlay that with a graph of purposed light behaviors about a black hole .
Experimental proof vs mathematical ?</tokentext>
<sentencetext>I think it would be interesting to see a 3D graph of the magnitude of a 'chirp' sent across the "black hole" and compare it with doppler shift equations, and then overlay that with a graph of purposed light behaviors about a black hole.
Experimental proof vs mathematical?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281517</id>
	<title>DONT DO IT SCIENTISTS!</title>
	<author>nausea\_malvarma</author>
	<datestamp>1244656440000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext>You'll create a BLACK HOLE that ENGULFS THE EARTH! Just like the LHC!</htmltext>
<tokenext>You 'll create a BLACK HOLE that ENGULFS THE EARTH !
Just like the LHC !</tokentext>
<sentencetext>You'll create a BLACK HOLE that ENGULFS THE EARTH!
Just like the LHC!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_06_10_1544246.28281871</id>
	<title>"First Acoustic Black Hole Created" Really?</title>
	<author>Anonymous</author>
	<datestamp>1244657760000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>I thought it was Nirvana Unplugged.</p></htmltext>
<tokenext>I thought it was Nirvana Unplugged .</tokentext>
<sentencetext>I thought it was Nirvana Unplugged.</sentencetext>
</comment>
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