Interesting. But the breakers would hold the busbars pretty solidly and there wasn't really any evidence of warping (unless it was completely elastic and it snapped back later).
Yeah it an industrial 480 three phase feeder for a printing pressroom.
You are right, they hired someone to do a short circuit protection coordination analysis after that (i.e. why did the upstream fuses blow instead of the 1500amp breaker tripping)...
They came up with something like 150,000 amps short current in their simulations.
We do know what caused the initial short.
What happened was that there was a 350 amp breaker for an A/C unit that went bad. The A/C shorted out somehow, and its breaker didn't flip. Eventually one of the upstream fuses blew for one phase, but not after the busbar was melted under the breaker.
They took that breaker out, put a new one in at a different position with undamaged busbar, then powered everything on. It was all working so they went to put the cover back on the panel.
I had walked out of the electrical closet because it was working at that point, so I was going to go turn the servers back on. I got about 25 feet out when the whole plant shuddered. It's hard to describe the sound of the wires jerking in their conduits like that. As they were placing the cover back on, something shifted and metal drippings from the initial short bridged two phases at the bottom of the busbars, blowing all three upstreams, and scaring the hell out of the maintenence guy putting that panel on!
Of course we didn't have fuses like that on hand (sigh). It was hard enough to locate one 1500 amp fuse, much less finding 3 more the same day within a 60 mile radius! Not exactly something you can buy at the hardware store!
Most of them! I read FAA accident reports, I guess kind of a sick hobby. The vast majority of incidents are small planes, and the majority of the small plane incidents that are fatal are indeed "VFR rated pilot flying into IFR conditions, colliding with terrain".
So unless you want to give out several dozen darwin awards every year to everyone that crashes in a similar way, it wouldn't be right to single out JFK for doing it.
You are right about that. They know the NEC inside and out, but they aren't so strong on the physics side of it usually.
I spent 15 minutes explaining to electricians how a plasma ball might be sustained (for a little while at least) by 1500amp mains shorting out, but I don't think they ever believed me.
The question arose because we blew all 3 phases' 1500 amp fuses when we shorted out what appeared to be two phases' busbars. My theory was that the two phases shorting out caused enough sustained plasma (for a few dozen/hundred milliseconds at least) to touch and short out out the third phase's busbar as well as well.
Thanks for the (relevant) citations. I knew something smelled a little fishy with the original posters assertions (and implications). It is good to know what is actually documented.
Which of those makes it easier to understand what the hell that config option does? Neither. With a few exceptions (like sendmail bullshit), the trouble with config files isn't understanding the format, it's understanding the semantics. And XML doesn't help one bit with that. It even makes it harder in some ways since XML comments look like shit and don't stand out.
The risk from smoking is often overstated. However, there's a big difference between smoking, which has obvious and immediate negative effects (coughing your lungs up every morning, loss of endurance, etc) and something like global warming climate change.
For one, it's easy to stop smoking and see if those effects go away. That's science. It's not so easy to stop producing greenhouse gasses and see what happens.
In addition, it's not like anyone was saying smoking was good for you in the 1960s, however the climate experts of the time were indeed warning about a global ice age back then.
They don't need to know. Most people know how to rip a CD and make mp3s, it's the same thing. They just click a few times and the thing does it. All they know is that their dual core does it twice as fast.
What? XML gets way too much "respect" by all the wrong people.
XML was designed for one thing, blind data interchange. That's it. Not config files, not GUI descriptions, not anything to do with databases. Get over it. Everything else is hype created by idiots that make money selling ads in magazines and on web sites.
As near as I can tell from the abstract, that paper is about "uplift and subsidence", i.e. sinkholes, caused by pockets of water embedded in the glacier moving around. Did you just look for any article about glacial hydrodynamics and think that I wouldn't know what those "big words" meant?
given that this is a well-documented and understood phenomenon
As near as I can tell, this is still only your assertion. I'm not an expert in these fields, you might be, but you are bad at picking citations at least, if this indeed is "well documented and understood".
what are your political motives for questioning it?
Your political motives are obvious. My motives are mainly scientific. I have little vested interest in the current energy cartels and industries. Alternative energy study is even a hobby of mine. I am opposed to using the violent force of the government to accomplish some social goal, but I don't think that's very relevant unless you are claiming that such measures should be put into place. I think we can solve any warming problem through technology. It's very important we have a rational discourse on it in any case, so that we know where to place our development priorities as a society.
Anyway, back to the science:
You've made a tenuous assertion that a) Humans have caused warming, b) This warming has caused increased surface melt, c) This surface melt is accelerating the breakup of glaciers, through a hydrodynamic process that is non-intuitive. Further there is the implication that d) this accelerated breakup even matters, or is bad in some way.
I might even conceed "a" to you, though I don't think there is sufficient evidence to determine the degree of human caused warming (it might be insignificant). "b" follows from "a", but "c" is an extraordinary claim. This leads us to where I called you out.
For "d" I'll invoke the law of unintended consequences and assume that it is bad. It may not be, but with that much volume of stuff moving around, it's probably going to affect *something*.
It seems like an unlikely scenario in any case. Water doesn't exactly make a good lubricant for sub-freezing ice, it has terrible viscosity performance below 32F!
There is a continent under the South Pole. You know, terra firma and all. Of course, if the climate changes a lot, we might lose a little coast line and a few islands around the equator, but we'll have some nice ski resorts in antartica!
That's really not the case. Adobe reader is better than xpdf in a lot of ways, but do a quick poll to see what most people have installed and I bet you'll find almost no one has linux version of Reader, but most have xpdf or ghostscript based PDF viewers.
I know that I was completely turned off by Java until they recently announced they were GPLing the entire lot. I might actually try to use/learn Java now that it is free.
The only time that people have not much trouble installing proprietary software is when there are little free alternative. Flash player, for example, is probably installed on a whole lot of linux systems, most of them in fact, I'd venture to bet. There's just no free software that comes anywhere near it.
What advantage is there to compiling to bytecode again?
Java has failed to deliver on the "write once run anywhere" line of BS, and.NET was never intended to do that.
We already have machines, they work just fine and AMD and Intel put a lot of effort into making them fast. Why do we want to add a pointless layer of machine abstraction on top of that?
it is no wonder that it is the only MMO still growing (and has been steadily since 2003 from what I hear)
Second Life isn't a "game" really, but since you left off the "G", I'll say it. SL started around 2003 and has been growing very quickly lately. The retention on there isn't very high, but they went from 1 million signups to 2 million signups in about a month.
It was more important back then, because that was the beginning of the end for MS. Now that it's just "MS profits slide even more" it really isn't too much news.
Slashdot Mirror
Interesting. But the breakers would hold the busbars pretty solidly and there wasn't really any evidence of warping (unless it was completely elastic and it snapped back later).
Yeah it an industrial 480 three phase feeder for a printing pressroom.
You are right, they hired someone to do a short circuit protection coordination analysis after that (i.e. why did the upstream fuses blow instead of the 1500amp breaker tripping)...
They came up with something like 150,000 amps short current in their simulations.
We do know what caused the initial short.
What happened was that there was a 350 amp breaker for an A/C unit that went bad. The A/C shorted out somehow, and its breaker didn't flip. Eventually one of the upstream fuses blew for one phase, but not after the busbar was melted under the breaker.
They took that breaker out, put a new one in at a different position with undamaged busbar, then powered everything on. It was all working so they went to put the cover back on the panel.
I had walked out of the electrical closet because it was working at that point, so I was going to go turn the servers back on. I got about 25 feet out when the whole plant shuddered. It's hard to describe the sound of the wires jerking in their conduits like that. As they were placing the cover back on, something shifted and metal drippings from the initial short bridged two phases at the bottom of the busbars, blowing all three upstreams, and scaring the hell out of the maintenence guy putting that panel on!
Of course we didn't have fuses like that on hand (sigh). It was hard enough to locate one 1500 amp fuse, much less finding 3 more the same day within a 60 mile radius! Not exactly something you can buy at the hardware store!
Most of them! I read FAA accident reports, I guess kind of a sick hobby. The vast majority of incidents are small planes, and the majority of the small plane incidents that are fatal are indeed "VFR rated pilot flying into IFR conditions, colliding with terrain".
So unless you want to give out several dozen darwin awards every year to everyone that crashes in a similar way, it wouldn't be right to single out JFK for doing it.
People pay for stupider things. Like "service monitoring"... GET /index.html... 200, yep you are ok. Please pay my invoice!
Ah, I did seem to recall that that one was older than 2006. Thanks for the link. :)
You are right about that. They know the NEC inside and out, but they aren't so strong on the physics side of it usually.
I spent 15 minutes explaining to electricians how a plasma ball might be sustained (for a little while at least) by 1500amp mains shorting out, but I don't think they ever believed me.
The question arose because we blew all 3 phases' 1500 amp fuses when we shorted out what appeared to be two phases' busbars. My theory was that the two phases shorting out caused enough sustained plasma (for a few dozen/hundred milliseconds at least) to touch and short out out the third phase's busbar as well as well.
It probably wouldn't have killed him. He'd need new pants though if that 30 amp circuit arced in front of him.
Thanks for the (relevant) citations. I knew something smelled a little fishy with the original posters assertions (and implications). It is good to know what is actually documented.
WorkAroundRFCFlaw=True
<WorkAroundRFCFlaw>True</WorkaroundRFCFlaw>
Which of those makes it easier to understand what the hell that config option does? Neither. With a few exceptions (like sendmail bullshit), the trouble with config files isn't understanding the format, it's understanding the semantics. And XML doesn't help one bit with that. It even makes it harder in some ways since XML comments look like shit and don't stand out.
The risk from smoking is often overstated. However, there's a big difference between smoking, which has obvious and immediate negative effects (coughing your lungs up every morning, loss of endurance, etc) and something like global warming climate change.
For one, it's easy to stop smoking and see if those effects go away. That's science. It's not so easy to stop producing greenhouse gasses and see what happens.
In addition, it's not like anyone was saying smoking was good for you in the 1960s, however the climate experts of the time were indeed warning about a global ice age back then.
Oh a guy on javadevelopersjournal.com thinks Java is the next big thing. Stop the presses!
They don't need to know. Most people know how to rip a CD and make mp3s, it's the same thing. They just click a few times and the thing does it. All they know is that their dual core does it twice as fast.
What? XML gets way too much "respect" by all the wrong people.
XML was designed for one thing, blind data interchange. That's it. Not config files, not GUI descriptions, not anything to do with databases. Get over it. Everything else is hype created by idiots that make money selling ads in magazines and on web sites.
You all sound like the biblical people. Exactly like them. You know that right?
If you create a prophesy, you will start to see "evidence" of it being fulfilled. This is especially true if the prophesy is about exceptional events.
I reject their dogma, and I reject yours too.
What about it? It's already sitting in water. It melting wouldn't have a lot of effect on humans.
Here is an example.
As near as I can tell from the abstract, that paper is about "uplift and subsidence", i.e. sinkholes, caused by pockets of water embedded in the glacier moving around. Did you just look for any article about glacial hydrodynamics and think that I wouldn't know what those "big words" meant?
given that this is a well-documented and understood phenomenon
As near as I can tell, this is still only your assertion. I'm not an expert in these fields, you might be, but you are bad at picking citations at least, if this indeed is "well documented and understood".
what are your political motives for questioning it?
Your political motives are obvious. My motives are mainly scientific. I have little vested interest in the current energy cartels and industries. Alternative energy study is even a hobby of mine. I am opposed to using the violent force of the government to accomplish some social goal, but I don't think that's very relevant unless you are claiming that such measures should be put into place. I think we can solve any warming problem through technology. It's very important we have a rational discourse on it in any case, so that we know where to place our development priorities as a society.
Anyway, back to the science:
You've made a tenuous assertion that a) Humans have caused warming, b) This warming has caused increased surface melt, c) This surface melt is accelerating the breakup of glaciers, through a hydrodynamic process that is non-intuitive. Further there is the implication that d) this accelerated breakup even matters, or is bad in some way.
I might even conceed "a" to you, though I don't think there is sufficient evidence to determine the degree of human caused warming (it might be insignificant). "b" follows from "a", but "c" is an extraordinary claim. This leads us to where I called you out.
For "d" I'll invoke the law of unintended consequences and assume that it is bad. It may not be, but with that much volume of stuff moving around, it's probably going to affect *something*.
And you have evidence for this claim?
It seems like an unlikely scenario in any case. Water doesn't exactly make a good lubricant for sub-freezing ice, it has terrible viscosity performance below 32F!
You do know what the word "climate" means right? It has little to do with exceptional events, in case you really are that dense.
There is a continent under the South Pole. You know, terra firma and all. Of course, if the climate changes a lot, we might lose a little coast line and a few islands around the equator, but we'll have some nice ski resorts in antartica!
That's really not the case. Adobe reader is better than xpdf in a lot of ways, but do a quick poll to see what most people have installed and I bet you'll find almost no one has linux version of Reader, but most have xpdf or ghostscript based PDF viewers.
I know that I was completely turned off by Java until they recently announced they were GPLing the entire lot. I might actually try to use/learn Java now that it is free.
The only time that people have not much trouble installing proprietary software is when there are little free alternative. Flash player, for example, is probably installed on a whole lot of linux systems, most of them in fact, I'd venture to bet. There's just no free software that comes anywhere near it.
What advantage is there to compiling to bytecode again?
.NET was never intended to do that.
Java has failed to deliver on the "write once run anywhere" line of BS, and
We already have machines, they work just fine and AMD and Intel put a lot of effort into making them fast. Why do we want to add a pointless layer of machine abstraction on top of that?
it is no wonder that it is the only MMO still growing (and has been steadily since 2003 from what I hear)
Second Life isn't a "game" really, but since you left off the "G", I'll say it. SL started around 2003 and has been growing very quickly lately. The retention on there isn't very high, but they went from 1 million signups to 2 million signups in about a month.
It was more important back then, because that was the beginning of the end for MS. Now that it's just "MS profits slide even more" it really isn't too much news.
Ms. Nevada.
Well, that's a silly last name.
(Yes I finally figured out there's someone named Katie Rees that did some lesbian something or another. Who gives a fuck?)
Your managers having nothing better to do than watch what sites the employees are visiting? That's one fucked up company you work at there.