*Exterior* temperature? My current heatsink can manage a CPU temperature below that, with the fan at idle. Why would I want to downgrade to this thing?
How big is big enough that nothing but Oracle will do? Facebook is on MySQL, Wikipedia is on MariaDB and Google is using Bigtable.
It's more the nature and size of access rather than the sheer volume of data. Facebook and Wikipedia both act on small portions of the overall dataset, Wikipedia additionally is a read-mostly workload, and Google's access patterns aren't suitable for a relational database.
I don't know about Los Angeles or San Francisco, but Phoenix's water usage has been dropping as a result of replacing citrus orchards with subdivisions.
There was a brief period (roughly 1993 to 1995) when copy protection worked to stop small-scale piracy: around the time when CD-ROM drives first became popular. If you could stuff a CD full of game files, you had a game that could not be economically pirated, because copying the CD required either a dedicated hard drive to store the data (hundreds to thousands of dollars), a hugely expensive CD recorder (tens of thousands of dollars), or a CD stamping facility (millions of dollars).
Starting on page 12 of the report is a series of maps showing the changes since the 2008 report. Of note:
* The South Carolina seismic zone has been displaced southward by about 50 miles. * The New Madrid zone has changed shape, with some areas seeing a substantial reduction in estimated earthquake risk. * The risk zones in California are more sharply defined. * The risk for the central Rocky Mountains area is higher, but still relatively low. * The earthquake risk estimate for coastal Oregon has been reduced. * A new seismic zone is present in Oklahoma, reflecting whatever is causing the massive increase in earthquake rates there.
The majority of passenger trips in the US are either less than 50 miles, or more than a thousand, with almost nothing in between. At the short end, the flexibility of car travel beats the cost reduction of rail; at the long end, the speed of air travel beats rail.
The only exception to this is the BosWash area, where -- guess what? -- Amtrak is able to provide profitable rail service. It's not motivation that keeps the US from having good passenger rail service, it's geography.
The random number generator should not be seeded only by a PID.
The PID is used as an absolute last-ditch fallback in the case that no other sources of randomness are available. In order for this to happen,/dev/urandom needs to be inaccessible, the KERN_RANDOM sysctl needs to be unavailable, gettimeofday() needs to fail, and clock_gettime() needs to fail.
If you're running on a system that crippled, you've really only got two choices: try seeding using the PID, or use an unseeded RNG. Or follow Theo's advice and get yourself a real operating system.
Soviets made a safety experiment with a nuclear reactor in Chernobyl. It didn't go wrong at all.
Correct. The 1982, 1984, and 1985 tests of using rotational energy of the turbines to power the emergency pumping system all went just fine. The 1986 disaster happened when the operator ignored the test procedure (specifically, the instruction "Reduce reactor thermal output to between 700MW and 800MW. If reactor thermal power output drops below 700MW, abort test and shut down reactor" -- the operator reduced the power to 30MW, raised it to 200MW, and attempted to perform the test).
More significantly, if you see left-to-right motion and say "forward", what percentage do you get right? I suspect there's a bias in videos towards left-to-right motion of subjects (or conversely, right-to-left motion of backgrounds), and I don't see anything in the paper about controlling for it.
Would it have changed the course of warfare? A bouncing bomb that worked at sea would have rendered virtually all navies obsolete.
You know what else can lift a ship and break its back? A torpedo with a magnetic fuse. Oddly enough, torpedo bombers don't appear to have rendered the world's navies obsolete.
Another candidate is the filling of the Persian Gulf: it wouldn't have been as abrupt as the proposed Black Sea deluge (taking years rather than days), but during the last Ice Age, the Gulf would have been prime agricultural land, at least as good if not better than Mesopotamia. There's a decent chance that there was a civilization there, where the Black Sea would likely have been nomadic tribes.
Sorta important - there's not much popular software that uses GNUTLS, but wget is one of them. Since it's almost always used as a client, it's probably wise to use curl -O against unknown servers, until they get this straightened out.
wget can be built against OpenSSL, and curl can be used with GnuTLS.
How much did it cost to setup their infrastructure to produce these cars? It seems like it would be a loss if they don't sell any at all. Why wouldn't they raise the price?
The electric Fiat shares probably 90% of its parts and most of an assembly line with the gas-powered Fiat 500; it's the remaining 10% (particularly the batteries) that make the 500e so expensive to produce. California clean-air laws require Fiat to sell a certain number of electric cars if they want to do business in California and restrict how much Fiat can mark up the price of the electric version. If Fiat can't get the parts needed for less than the permissible markup, they're required to sell the cars at a loss.
I don't know about this balloon, but the ones I've been tracking on FlightRadar are solidly *above* controlled airspace. Airliners tend to hang out around 30,000-40,000 feet, business jets are typically 35,000-45,000 feet, and Google's balloons are at 60,000 feet and above.
That aside, both the passenger and the driver are aware of the optimal route
The passenger is aware of what his smartphone thinks is the optimal route.
Consider going from the Spokane airport to the Lakeside area: Google Maps routes you via I-90 and the Maple Street Bridge, but during rush hour, this is a wonderful place to run up the meter, with delays of 10-30 minutes on a 30-minute trip. Going via the Sunset Highway instead avoids much of the traffic (and cuts a quarter-mile off the meter), but to someone who's not a local, it looks like you're being dragged off into the middle of nowhere to be mugged, or at least ripped off on the taxi fare.
Now, as someone from out of town, how are you going to judge if the driver is telling you the truth about why he's going somewhere your smartphone doesn't want him to?
what is it you think is the problem? what do you think will surface? please no snark, I'm genuinely curious.
1) Drivers deliberately taking sub-optimal routes to run up the meter. 2) Drivers putting in too many hours a day, leading to an increased accident rate. 3) Drivers using the cheapest cars they can buy/skimping on maintenance to keep their costs down. 4) Drivers extorting passengers to pad their income ("An extra $20 off the books, and I won't take the scenic route"). 5) Drivers refusing to take people to low-profit destinations ("Take you out there? The hour I'd spend getting back to the city for my next fare would eat my profits for the week")
Criminal record check is completely unnecessary. How are convicted felons ever going to find work if we put background checks on everything?
You make the background check appropriate for the job. For example, I don't want a taxi driver who's been convicted of mugging or drunk driving, but I don't care if he's got a past as an embezzler. Conversely, I don't care if my accountant spent his teenage years knocking over convenience stores for drug money, but a history of embezzlement is unacceptable.
That's only if you've got a pump lifting the water out, leaving 860 feet of empty pipe -- and if you're doing that, the energy cost is the same as if you put the membrane on the surface and used a high-pressure pump to simulate 860 feet of depth.
If you want to get away from needing pumps to filter the water, you need to base your calculations on the density difference between fresh water and salt water, not the difference between salt water and air.
The natural osmotic pressure of sea water is 390 pounds per square inch. You'd need to stick your filter deep enough that the pressure difference between your column of fresh water and the surrounding sea water exceeds that, which a back-of-the-envelope calculation says occurs at a depth of 6.6 miles. The Mariana Trench is 6.8 miles deep, so yes, it'll work, but just barely.
I don't know about GPS units, but I've had Google Maps send me on a complicated route through the alleys of a small town because someone forgot to enter a permitted turn at the intersection of two major highways. I've had it tell me to drive through a concrete barrier because someone recorded the intersection as a cross intersection rather than back-to-back "T" intersections. I've had it give me a route four hours longer than necessary, because it thought part of the short route was still closed for the winter. And most recently, it give me a route that ended twenty miles short of my destination because it picked the park administrative headquarters in a nearby city as the location of the park, rather than somewhere actually, you know, *in* the park.
No, modern telescopes use mirrors instead of lenses for two reasons:
1) Once a lens gets more than about a meter across, it starts deforming measurably under its own weight (and the direction and amount of deformation changes as you shift the telescope). A mirror can be supported across its entire width and does not have this problem.
2) A lens experiences chromatic aberration, causing different frequencies of light to focus at different points. You can reduce (but not eliminate) this by using achromatic doublets or other optical tricks (such as absurdly long telescopes), or you can take the easy way out and just use a mirror.
Slashdot Mirror
*Exterior* temperature? My current heatsink can manage a CPU temperature below that, with the fan at idle. Why would I want to downgrade to this thing?
Don't tell the HURD people -- they'll change which microkernel they're building around, again.
It's more the nature and size of access rather than the sheer volume of data. Facebook and Wikipedia both act on small portions of the overall dataset, Wikipedia additionally is a read-mostly workload, and Google's access patterns aren't suitable for a relational database.
I don't know about Los Angeles or San Francisco, but Phoenix's water usage has been dropping as a result of replacing citrus orchards with subdivisions.
There was a brief period (roughly 1993 to 1995) when copy protection worked to stop small-scale piracy: around the time when CD-ROM drives first became popular. If you could stuff a CD full of game files, you had a game that could not be economically pirated, because copying the CD required either a dedicated hard drive to store the data (hundreds to thousands of dollars), a hugely expensive CD recorder (tens of thousands of dollars), or a CD stamping facility (millions of dollars).
Which gives a power density of 0.78 watts per cubic inch. The Google challenge calls for a minimum power density of 50 watts per cubic inch.
Starting on page 12 of the report is a series of maps showing the changes since the 2008 report. Of note:
* The South Carolina seismic zone has been displaced southward by about 50 miles.
* The New Madrid zone has changed shape, with some areas seeing a substantial reduction in estimated earthquake risk.
* The risk zones in California are more sharply defined.
* The risk for the central Rocky Mountains area is higher, but still relatively low.
* The earthquake risk estimate for coastal Oregon has been reduced.
* A new seismic zone is present in Oklahoma, reflecting whatever is causing the massive increase in earthquake rates there.
The majority of passenger trips in the US are either less than 50 miles, or more than a thousand, with almost nothing in between. At the short end, the flexibility of car travel beats the cost reduction of rail; at the long end, the speed of air travel beats rail.
The only exception to this is the BosWash area, where -- guess what? -- Amtrak is able to provide profitable rail service. It's not motivation that keeps the US from having good passenger rail service, it's geography.
The PID is used as an absolute last-ditch fallback in the case that no other sources of randomness are available. In order for this to happen, /dev/urandom needs to be inaccessible, the KERN_RANDOM sysctl needs to be unavailable, gettimeofday() needs to fail, and clock_gettime() needs to fail.
If you're running on a system that crippled, you've really only got two choices: try seeding using the PID, or use an unseeded RNG. Or follow Theo's advice and get yourself a real operating system.
Correct. The 1982, 1984, and 1985 tests of using rotational energy of the turbines to power the emergency pumping system all went just fine. The 1986 disaster happened when the operator ignored the test procedure (specifically, the instruction "Reduce reactor thermal output to between 700MW and 800MW. If reactor thermal power output drops below 700MW, abort test and shut down reactor" -- the operator reduced the power to 30MW, raised it to 200MW, and attempted to perform the test).
More significantly, if you see left-to-right motion and say "forward", what percentage do you get right? I suspect there's a bias in videos towards left-to-right motion of subjects (or conversely, right-to-left motion of backgrounds), and I don't see anything in the paper about controlling for it.
You know what else can lift a ship and break its back? A torpedo with a magnetic fuse. Oddly enough, torpedo bombers don't appear to have rendered the world's navies obsolete.
I'm sure the NSA has copies. Perhaps someone should request them?
Another candidate is the filling of the Persian Gulf: it wouldn't have been as abrupt as the proposed Black Sea deluge (taking years rather than days), but during the last Ice Age, the Gulf would have been prime agricultural land, at least as good if not better than Mesopotamia. There's a decent chance that there was a civilization there, where the Black Sea would likely have been nomadic tribes.
wget can be built against OpenSSL, and curl can be used with GnuTLS.
The electric Fiat shares probably 90% of its parts and most of an assembly line with the gas-powered Fiat 500; it's the remaining 10% (particularly the batteries) that make the 500e so expensive to produce. California clean-air laws require Fiat to sell a certain number of electric cars if they want to do business in California and restrict how much Fiat can mark up the price of the electric version. If Fiat can't get the parts needed for less than the permissible markup, they're required to sell the cars at a loss.
I don't know about this balloon, but the ones I've been tracking on FlightRadar are solidly *above* controlled airspace. Airliners tend to hang out around 30,000-40,000 feet, business jets are typically 35,000-45,000 feet, and Google's balloons are at 60,000 feet and above.
The passenger is aware of what his smartphone thinks is the optimal route.
Consider going from the Spokane airport to the Lakeside area: Google Maps routes you via I-90 and the Maple Street Bridge, but during rush hour, this is a wonderful place to run up the meter, with delays of 10-30 minutes on a 30-minute trip. Going via the Sunset Highway instead avoids much of the traffic (and cuts a quarter-mile off the meter), but to someone who's not a local, it looks like you're being dragged off into the middle of nowhere to be mugged, or at least ripped off on the taxi fare.
Now, as someone from out of town, how are you going to judge if the driver is telling you the truth about why he's going somewhere your smartphone doesn't want him to?
1) Drivers deliberately taking sub-optimal routes to run up the meter.
2) Drivers putting in too many hours a day, leading to an increased accident rate.
3) Drivers using the cheapest cars they can buy/skimping on maintenance to keep their costs down.
4) Drivers extorting passengers to pad their income ("An extra $20 off the books, and I won't take the scenic route").
5) Drivers refusing to take people to low-profit destinations ("Take you out there? The hour I'd spend getting back to the city for my next fare would eat my profits for the week")
You make the background check appropriate for the job. For example, I don't want a taxi driver who's been convicted of mugging or drunk driving, but I don't care if he's got a past as an embezzler. Conversely, I don't care if my accountant spent his teenage years knocking over convenience stores for drug money, but a history of embezzlement is unacceptable.
That's only if you've got a pump lifting the water out, leaving 860 feet of empty pipe -- and if you're doing that, the energy cost is the same as if you put the membrane on the surface and used a high-pressure pump to simulate 860 feet of depth.
If you want to get away from needing pumps to filter the water, you need to base your calculations on the density difference between fresh water and salt water, not the difference between salt water and air.
The natural osmotic pressure of sea water is 390 pounds per square inch. You'd need to stick your filter deep enough that the pressure difference between your column of fresh water and the surrounding sea water exceeds that, which a back-of-the-envelope calculation says occurs at a depth of 6.6 miles. The Mariana Trench is 6.8 miles deep, so yes, it'll work, but just barely.
I don't know about GPS units, but I've had Google Maps send me on a complicated route through the alleys of a small town because someone forgot to enter a permitted turn at the intersection of two major highways. I've had it tell me to drive through a concrete barrier because someone recorded the intersection as a cross intersection rather than back-to-back "T" intersections. I've had it give me a route four hours longer than necessary, because it thought part of the short route was still closed for the winter. And most recently, it give me a route that ended twenty miles short of my destination because it picked the park administrative headquarters in a nearby city as the location of the park, rather than somewhere actually, you know, *in* the park.
20 kilotons is probably the upper limit of what their detector can handle. ">20 kilotons" is simply a way of expressing "off the scale".
No, modern telescopes use mirrors instead of lenses for two reasons:
1) Once a lens gets more than about a meter across, it starts deforming measurably under its own weight (and the direction and amount of deformation changes as you shift the telescope). A mirror can be supported across its entire width and does not have this problem.
2) A lens experiences chromatic aberration, causing different frequencies of light to focus at different points. You can reduce (but not eliminate) this by using achromatic doublets or other optical tricks (such as absurdly long telescopes), or you can take the easy way out and just use a mirror.