Gallium arsenide (GaAs) also good for HF microwave stuff.
The higher saturated electron velocity and higher electron mobility, allowing transistors made from it to function at frequencies in excess of 250 GHz
http://en.wikipedia.org/wiki/Gallium_arsenide#GaAs_advantages
That's one reason they invented SOI. Other advantages include higher speeds (due to less capacitance), higher operating temperatures, latch-up free, and radiation hardness.
remove the fuel, and separate it enough physically that the reaction 'stops'.
The neutron chain reaction has already stopped. Problem is, so many other isotopes with short half-lives built up over the years of operation, they are now spontaneously decaying, dumping heat. THATS the heat that needs to be removed to prevent melting of zirconium cladding. When it does, redox reaction with water generated the hydrogen gas which exploded.
It is amusing to see the comments here which excuse the problem at the Japanese nuclear plant because the earthquake was really big. You see to many people who don't have an automatic fear of anything nuclear, there remains the problem of the people running it. The technology might be safe but when those in charge aren't doing their jobs then there is basis for distrust.
1. The earthquake was big: It's Japan. You can't not expect a big earthquake. Everything has to be ready for it.
2. The tsunami unexpectedly washed out the generators: see point 1.
3. It was an old plant, the new ones are safer: if this one wasn't safe then why was it running?
The point to me is not that nuclear power is unsafe, but rather that unacceptable risks were taken in this case. Does the same problem exist are other sites in other countries? I have no idea (and I bet the armchair Slashdot crowd doesn't know either), but there is a serious lack of trust right now over how that risk is being evaluated.
None of this excuses the sensationalism in the media or the fools in the US who are buying anti-radiation tonic in preparation, or even the foreigners who are fleeing the entire country of Japan over the threat of 'meltdown'.
PS. What if all six reactors had been working?
Safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns.
That’s why Congress (foolishly) passed the
Price-Anderson Act.
The Navy has never experienced a core melt-down (that we know of) despite operating many nuclear-powered subs and aircraft carriers – but they don't have the competitive pressure to maximize profits.
You're taking the long view. When private businesses needs to make this quarter's targets - corners will be cut. Core clean-ups and oil-spill disasters are far-off - after management has collected their bonuses and retired.
Too big to fail is too big to exist.
France may just have been lucky so far - time will tell.
My point is that when there's a profit motive, safety often takes a back-seat to expediency. That's not saying the Navy won't ever have an accident (they do have to perform more dangerous opertations) - just that it's less likely without the pressure to make a profit.
My reading: older, better known reactor designs are safer.
My reading: reactors built by capitalist corporations who face massive financial loss when something goes wrong are safer than reactors built by communist dictatorships to produce plutonium for nuclear weapons.
My reading: safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns.
That’s why Congress (foolishly) passed the
Price-Anderson Act
Meanwhile, the Navy has never experienced a core melt-down (that we know of) despite operating fleets of nuclear-powered subs and aircraft carriers – they don't have the competitive pressure to maximize profits.
Safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns.
That’s why Congress (foolishly) passed the Price-Anderson Act.
"http://en.wikipedia.org/wiki/Price–Anderson_Nuclear_Industries_Indemnity_Act"
The Navy has never experienced a core melt-down (that we know of) despite operating fleets of nuclear-powered subs and aircraft carriers – they don't have the competitive pressure to maximize profits.
It's quite illegal in jurisdictions I'm familiar with for a juror in the jury room to say and then follow through by voting on a statement like "I don't care what the law says, I'm not convicting this guy even if he is guilty" while it is perfectly legal for the same juror to keep his trap shut and just vote "not guilty."
Paleobotanists have long know this to be truce. One ancient plant accounts for many species, know only by their bark, seeds, leaves, or roots. Similarly, Brontosaurus is no longer recognized since earlier Apatosaurus fossils identified as the same animal.
It was (and still is) called PayFlow Pro. PayPal got it when then bought VeriSign's payment unit in late 2005. I think VeriSign have have obtained it PayFlow Pro from CyberCash even longer ago.
Top #1 - thermo nuke fusion for clean, free electrical energy. Not cold fusion, but real tokamak magnetic bottle or big laser inertial confinement reported here recently. Hydrogen is the most abundant element in the universe while the fossil fuels are running out. We'll never be able to support ourselves in the manner to which we'd like to become accustomed (much less lift most of humanity off the planet when the sun burns out) without an abundant energy supply. Shorter term, we'll be driving rechargeable cars (plug-in) and warming our homes on the waste heat of our personal datacenters.
You are absolutely right - it depends. In general, a sailing vessel's polar diagram predicts the fastest point of sail for any given wind speed. For example,
with 8 knots of breeze, a Catalina 34 is fastest with the wind 60 degrees off the bow, but in a 20 knot blow she's fastest at 75 degrees apparent. While
other boats will vary, iceboats are an extreme example, traveling so fast as to shift the apparent wind forward even when heading "down wind." I'm not sure how applicable any of this is to the kite-powered tanker. I was unimpressed by the video - the kite expended much of it's energy going side to side. Even when mostly ahead, the angle was so high as to exert more of a vertical lifting vector than forward thrust. But any little bit helps, I suppose, especially when you can take you time crossing large expanses of water.
"Down-wind" is not the best point of sail. "Close-hauled" is. Nope. A beam-reach, or perpendicular to the apparent wind, is the best point of sail. Close hauled is 2nd best. Down-wind is the least effective.
6.) I will not buy digital TV until the BROADCAST FLAG has been outlawed. The industry wants to eliminate fair-use like time-shifting and sling-casting. Not home when your favorite soap airs? Too bad.
7.) Where are all the federally subsidized down-converter boxes? We were told 1 or 2 would be made available to each household for $10 (subsidized by auctioning off the old spectrum). They plan to turn off the analog signal in less than 6 months and I've got 6 analog TVs.
I don't understand how the FCC can control the cable broadcasters (they aren't using the public airwaves) but I applaud the move to keep analog TV alive without more hardware.
Mailman gets it right while pointing out this vulnerability. Attempt to subscribe to a mailman listserv when you're already a member and you'll see no error page. Rather, the real subscriber gets an email with subject Mailman privacy alert that reads
An attempt was made to subscribe your address to the mailing list . You are already subscribed to this mailing list.
Note that the list membership is not public, so it is possible that a bad person was trying to probe the list for its membership. This would be a privacy violation if we let them do this, but we didn't.
If you submitted the subscription request and forgot that you were already subscribed to the list, then you can ignore this message. If you suspect that an attempt is being made to covertly discover whether you are a member of this list, and you are worried about your privacy, then feel free to send a message to the list administrator...
Regarding the imposibility of a child getting root, this doesn't streach our suspension of disbelief these days when the internet, new zero-day vunerabilies, and script kiddies might get the jump on an older programmer.
They rise until they replace exactly the volume of water they'd have once molten.
WRONG! You've misquoted Archimedes' principle. They rise until they replace exactly the weight of water they'd have once molten. Since ice is less dense than liquid water, the water level does drop as the parent stated. The weight of ice + water does not change, but the volume decreases.
Slashdot Mirror
Gallium arsenide (GaAs) also good for HF microwave stuff. The higher saturated electron velocity and higher electron mobility, allowing transistors made from it to function at frequencies in excess of 250 GHz http://en.wikipedia.org/wiki/Gallium_arsenide#GaAs_advantages
That's one reason they invented SOI. Other advantages include higher speeds (due to less capacitance), higher operating temperatures, latch-up free, and radiation hardness.
While you may not yell "fire" in a crowded theater, you can call 'em, as you see 'em.
Though not particularly original, given Zuckerberg's "prank" in The social Network
I may not agree with what he said, but I'll defend to the death his right to say it. In other words, it's a threat to free speech.
... articulating hull to deal with drag of a long tail
The articulating hull is to assist with tacking (Moving the rudder forward is how they dealt with the drag of a long tow-load).
Why not gybe instead of tacking? I suspect that would risk entanglement with the long tail.
remove the fuel, and separate it enough physically that the reaction 'stops'.
The neutron chain reaction has already stopped. Problem is, so many other isotopes with short half-lives built up over the years of operation, they are now spontaneously decaying, dumping heat. THATS the heat that needs to be removed to prevent melting of zirconium cladding. When it does, redox reaction with water generated the hydrogen gas which exploded.
It is amusing to see the comments here which excuse the problem at the Japanese nuclear plant because the earthquake was really big. You see to many people who don't have an automatic fear of anything nuclear, there remains the problem of the people running it. The technology might be safe but when those in charge aren't doing their jobs then there is basis for distrust.
1. The earthquake was big: It's Japan. You can't not expect a big earthquake. Everything has to be ready for it.
2. The tsunami unexpectedly washed out the generators: see point 1.
3. It was an old plant, the new ones are safer: if this one wasn't safe then why was it running?
The point to me is not that nuclear power is unsafe, but rather that unacceptable risks were taken in this case. Does the same problem exist are other sites in other countries? I have no idea (and I bet the armchair Slashdot crowd doesn't know either), but there is a serious lack of trust right now over how that risk is being evaluated.
None of this excuses the sensationalism in the media or the fools in the US who are buying anti-radiation tonic in preparation, or even the foreigners who are fleeing the entire country of Japan over the threat of 'meltdown'.
PS. What if all six reactors had been working?
Safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns. That’s why Congress (foolishly) passed the Price-Anderson Act.
The Navy has never experienced a core melt-down (that we know of) despite operating many nuclear-powered subs and aircraft carriers – but they don't have the competitive pressure to maximize profits.
You're taking the long view. When private businesses needs to make this quarter's targets - corners will be cut. Core clean-ups and oil-spill disasters are far-off - after management has collected their bonuses and retired. Too big to fail is too big to exist. France may just have been lucky so far - time will tell. My point is that when there's a profit motive, safety often takes a back-seat to expediency. That's not saying the Navy won't ever have an accident (they do have to perform more dangerous opertations) - just that it's less likely without the pressure to make a profit.
My reading: older, better known reactor designs are safer.
My reading: reactors built by capitalist corporations who face massive financial loss when something goes wrong are safer than reactors built by communist dictatorships to produce plutonium for nuclear weapons.
My reading: safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns. That’s why Congress (foolishly) passed the Price-Anderson Act
Meanwhile, the Navy has never experienced a core melt-down (that we know of) despite operating fleets of nuclear-powered subs and aircraft carriers – they don't have the competitive pressure to maximize profits.
One heat-wave will not render larger parcels of expensive real-estate uninhabitable for centuries.
Safe nuclear power is incompatible with Private industry - they must cut corners to maximize shareholder returns. That’s why Congress (foolishly) passed the Price-Anderson Act. "http://en.wikipedia.org/wiki/Price–Anderson_Nuclear_Industries_Indemnity_Act" The Navy has never experienced a core melt-down (that we know of) despite operating fleets of nuclear-powered subs and aircraft carriers – they don't have the competitive pressure to maximize profits.
It's quite illegal in jurisdictions I'm familiar with for a juror in the jury room to say and then follow through by voting on a statement like "I don't care what the law says, I'm not convicting this guy even if he is guilty" while it is perfectly legal for the same juror to keep his trap shut and just vote "not guilty."
You didn't say where these jurisdictions are located, but I don't believe you are correct, at least in the USA - see http://en.wikipedia.org/wiki/Jury_nullification#United_States Also, from http://www.fija.org/docs/JG_If_you_are_called_for_Jury_Duty.pdf "You can't be punished for voting according to your conscience. Judges (and other jurors) often pressure hold-out jurors into abandoning their true feelings and voting with the majority "
Paleobotanists have long know this to be truce. One ancient plant accounts for many species, know only by their bark, seeds, leaves, or roots. Similarly, Brontosaurus is no longer recognized since earlier Apatosaurus fossils identified as the same animal.
It was (and still is) called PayFlow Pro. PayPal got it when then bought VeriSign's payment unit in late 2005. I think VeriSign have have obtained it PayFlow Pro from CyberCash even longer ago.
Top #1 - thermo nuke fusion for clean, free electrical energy. Not cold fusion, but real tokamak magnetic bottle or big laser inertial confinement reported here recently. Hydrogen is the most abundant element in the universe while the fossil fuels are running out. We'll never be able to support ourselves in the manner to which we'd like to become accustomed (much less lift most of humanity off the planet when the sun burns out) without an abundant energy supply. Shorter term, we'll be driving rechargeable cars (plug-in) and warming our homes on the waste heat of our personal datacenters.
You are absolutely right - it depends. In general, a sailing vessel's polar diagram predicts the fastest point of sail for any given wind speed. For example, with 8 knots of breeze, a Catalina 34 is fastest with the wind 60 degrees off the bow, but in a 20 knot blow she's fastest at 75 degrees apparent. While other boats will vary, iceboats are an extreme example, traveling so fast as to shift the apparent wind forward even when heading "down wind." I'm not sure how applicable any of this is to the kite-powered tanker. I was unimpressed by the video - the kite expended much of it's energy going side to side. Even when mostly ahead, the angle was so high as to exert more of a vertical lifting vector than forward thrust. But any little bit helps, I suppose, especially when you can take you time crossing large expanses of water.
7.) Where are all the federally subsidized down-converter boxes? We were told 1 or 2 would be made available to each household for $10 (subsidized by auctioning off the old spectrum). They plan to turn off the analog signal in less than 6 months and I've got 6 analog TVs.
I don't understand how the FCC can control the cable broadcasters (they aren't using the public airwaves) but I applaud the move to keep analog TV alive without more hardware.
It's been done for other applications too, by hobbyists, inventors and engineers using the Honeywell/PointResearch miniature DRM and GyroDRM - these belt mountable units supliment GPS positions with dead reckoning when no GPS signal is available (canyons, mountains, cities) for under $3000.
And in the The Matrix Reloaded, recall Trinity using nmap to find open ports on her victum? Nmap Author Fyodor brags bout this:
We have all seen many movies like Hackers which pass off ridiculous 3D animated eye-candy scenes as hacking. So I was shocked to find that Trinity does it properly in The Matrix Reloaded [Under $10 at Amazon]. She whips out Nmap version 2.54BETA25, uses it to find a vulnerable SSH server, and then proceeds to exploit it using the SSH1 CRC32 exploit from 2001. Shame on them for being vulnerable (timing notes). Congratulations to everyone who has helped make Nmap successful! And thanks to Jason Algol, Titney, Thorsten Delbrouck, and others for sending pics!
They rise until they replace exactly the volume of water they'd have once molten.
WRONG! You've misquoted Archimedes' principle. They rise until they replace exactly the weight of water they'd have once molten. Since ice is less dense than liquid water, the water level does drop as the parent stated. The weight of ice + water does not change, but the volume decreases.
Top 10 Reasons My Land Rover Discovery Sucks
Just smbmount the Windows server under an Apache server's document root. Presto, all your files are now on the web.
We did this and now our free search engine has index 750,000 documents - far more than would be possible with the Google mini's limits of 50,000.