I'm not sure how you came to that conclusion. AC suffers from several effects that make it less efficient and/or more expensive over long distances.
For DC, the power delivered is V*I. For AC, it's similar except the V is really Vrms - you must insulate for Vpeak, but you only get Vrms * I power. For sinusoidal AC, the difference is a factor of 1.414.
With AC circuits that have non-zero reactance, you must choose a conductor that can carry Imax, but the power delivered to the load is only Vrms * Imax * cos(phi), phi being the phase angle between the voltage and current.
AC circuits suffer from the skin effect where the power travels more on the surface of the conductor rather than equally throughout its cross-section. This requires a larger solid or stranded conductor than would be required for DC.
AC has a few things going for it - the ease with which voltage can be transformed, the ease of generation with rotating generators, and ability to drive large, multiphase motors efficiently.
In addition to the volume taken up by the rods, a commentator on the news said that some may have been lost to sloshing during the quake, which is understandable.
So what has barred the Japanese from buying those hypothetical "plenty of new, modern, safe nuclear reactors."
Nothing except economics. The irony (if I dare to use that word on slashdot) of the situation is that the Dai-ichi site was slated for decommissioning in February, but its license was extended by 10 years. Had they been in the middle of decommissioning when the quake/tsunami hit there could have been 6 reactor's worth of screaming hot rods in the upper containment pools.
Actually the fastest rounds will easily top 4000 FPS. For instance, the.204 Ruger with a 40 grain bullet hits 4135 FPS.
As does my.22-250 loaded with a <= 52 gr ballistic tip BTHP and a lot of powder. I've measured the velocity of my hand-loaded rounds at over 4,000 fps, but they're not horribly accurate and are very hard on the barrel throat. They make a helluva 'crack!' when fired though.
The wikipedia page lists 4224 fps for a 40 gr and 3786 for a 55 gr bullet.
For an example of efficient long-distance DC transmission, read about the Pacific DC Intertie. I was lucky enough to tour the Oregon end of this thing before 9/11, and it was truly amazing. The HVDC equipment looked like stuff straight out of sci-fi - inexplicable nodules and bumps, strange angles, etc.
I would put a Republican joke here, but I don't see the Democrats doing it either.
I think you'd see a Republican support space initiatives because of the possible military spinoffs long before a "We've got to solve all our problems here on Earth first" Democrat.
I believe that once we've diverted all our money into feel-good social initiatives and stop pushing forward the boundaries of science, we're doomed. We may already be doomed, in fact. We're pretty far along that road with all of the current 'entitlements' and 'Bread and Circuses' attitude of the average American Idol (idle, really) consumer.
Another concern is RFI - without a metal case acting as a Faraday cage all of those lovely square wave logic signals will radiate their fundamental and odd harmonics all over the place.
That's Fels-Naptha (Fels was the inventor's last name), and I thought I was the only geek who'd heard of it. That's potent stuff. It even has an MSDS listing their particular flavor of naptha - "Hydrocarbons, Terpene Processing By-Products".
Projects NERVA and Rover showed that nuclear-powered spaceflight was not only possible but practical. I quote: "NERVA demonstrated that nuclear thermal rocket engines were a feasible and reliable tool for space exploration, and at the end of 1968 SNPO certified that the latest NERVA engine, the NRX/XE, met the requirements for a manned Mars mission."
Automatic versioning of files, for one thing. That was kinda neat - you could tell the filesystem to keep 'n' versions and could access them explicitly like hello.c;3. The OS would return the last revision if you didn't specify the version.
Slashdot Mirror
I'm not sure how you came to that conclusion. AC suffers from several effects that make it less efficient and/or more expensive over long distances.
For DC, the power delivered is V*I. For AC, it's similar except the V is really Vrms - you must insulate for Vpeak, but you only get Vrms * I power. For sinusoidal AC, the difference is a factor of 1.414.
With AC circuits that have non-zero reactance, you must choose a conductor that can carry Imax, but the power delivered to the load is only Vrms * Imax * cos(phi), phi being the phase angle between the voltage and current.
AC circuits suffer from the skin effect where the power travels more on the surface of the conductor rather than equally throughout its cross-section. This requires a larger solid or stranded conductor than would be required for DC.
AC has a few things going for it - the ease with which voltage can be transformed, the ease of generation with rotating generators, and ability to drive large, multiphase motors efficiently.
There is even some data against the LNT model - radiological hormesis seems to be in play in Ramsar, Iran.
I don't speak or read Japanese, but I do know that there are parts of Brazil and Iran that have incredibly high levels of naturally occurring background radiation. I assume the Brazilian flag is there to represent to dose you'd get living in one of the [V]HBRA areas in Brazil.
As another poster said, it's reasonable to engineer to a once-in-a-thousand-years standard. It sounds like they where only off by 142 years.
In addition to the volume taken up by the rods, a commentator on the news said that some may have been lost to sloshing during the quake, which is understandable.
So what has barred the Japanese from buying those hypothetical "plenty of new, modern, safe nuclear reactors."
Nothing except economics. The irony (if I dare to use that word on slashdot) of the situation is that the Dai-ichi site was slated for decommissioning in February, but its license was extended by 10 years. Had they been in the middle of decommissioning when the quake/tsunami hit there could have been 6 reactor's worth of screaming hot rods in the upper containment pools.
It was verified as a hydrogen explosion, not a reactor overpressure rupture.
Actually the fastest rounds will easily top 4000 FPS. For instance, the .204 Ruger with a 40 grain bullet hits 4135 FPS.
As does my .22-250 loaded with a <= 52 gr ballistic tip BTHP and a lot of powder. I've measured the velocity of my hand-loaded rounds at over 4,000 fps, but they're not horribly accurate and are very hard on the barrel throat. They make a helluva 'crack!' when fired though.
The wikipedia page lists 4224 fps for a 40 gr and 3786 for a 55 gr bullet.
My brother, Neil, and I would volunteer in a heartbeat.
Thanks,
Ben Dover
How about your sister Eileen?
For an example of efficient long-distance DC transmission, read about the Pacific DC Intertie. I was lucky enough to tour the Oregon end of this thing before 9/11, and it was truly amazing. The HVDC equipment looked like stuff straight out of sci-fi - inexplicable nodules and bumps, strange angles, etc.
I would put a Republican joke here, but I don't see the Democrats doing it either.
I think you'd see a Republican support space initiatives because of the possible military spinoffs long before a "We've got to solve all our problems here on Earth first" Democrat.
I believe that once we've diverted all our money into feel-good social initiatives and stop pushing forward the boundaries of science, we're doomed. We may already be doomed, in fact. We're pretty far along that road with all of the current 'entitlements' and 'Bread and Circuses' attitude of the average American Idol (idle, really) consumer.
Also lost in this launch were three Amateur Radio Satellites.
Another concern is RFI - without a metal case acting as a Faraday cage all of those lovely square wave logic signals will radiate their fundamental and odd harmonics all over the place.
Just because it's not officially a declaration of war doesn't mean it isn't a war.
Uh, yes it does. There's a reason that formality exists, and the US government has not followed it; it is not a war by definition.
Thompson Center/Contender. Interchangeable barrels for a ton of calibers - look under Specifications.
Don't forget Russell Nelson and the Crynwr Packet Drivers - they were awesome as well.
http://img546.imageshack.us/img546/4724/201103021949set.jpg
This was taken by Ralf Vandebergh, a contributor to the seesat-l sat observation list.
More astronaut spacewalk and ISS pics: http://ralfvandebergh.startje.be/
...a bar of Phels-Naptha...
That's Fels-Naptha (Fels was the inventor's last name), and I thought I was the only geek who'd heard of it. That's potent stuff. It even has an MSDS listing their particular flavor of naptha - "Hydrocarbons, Terpene Processing By-Products".
Something like Digger's girlfriend Annie, perhaps?
Projects NERVA and Rover showed that nuclear-powered spaceflight was not only possible but practical. I quote: "NERVA demonstrated that nuclear thermal rocket engines were a feasible and reliable tool for space exploration, and at the end of 1968 SNPO certified that the latest NERVA engine, the NRX/XE, met the requirements for a manned Mars mission."
...AMPHO...
Perhaps you mean ANFO - Ammonium Nitrate/Fuel Oil.
Yet another Tiller's rule violation.
http://en.wikipedia.org/wiki/Lagrangian_point or more specifically,
http://en.wikipedia.org/wiki/Lagrangian_point#Stability
Of course if you see it with a mohawk haircut, vicious boots, and a chainsaw, it's endoplasmatic reticulum.
Automatic versioning of files, for one thing. That was kinda neat - you could tell the filesystem to keep 'n' versions and could access them explicitly like hello.c;3. The OS would return the last revision if you didn't specify the version.
PS - See 'oversampling' - another way to help the filter problem.