In the high power industry, resistive loads often do use water. Usually just as a coolant though.
You do have more than a theory... I saw one article where a dumpster was filled with water, and electrodes passed a current though the water as a make-shift test load for a small-scale hydro dam.
You can't be serious. Don't try this at home kiddies.
I've worked in my profession with high voltages and high wattage loads, actually. It's something that only engineers or fools should be tinkering with. If you don't know what I^2 * R is for, or how to insulate such a rig properly, then don't even think of it.
Re:Cha ching, reloaded.
on
Gates on Spam
·
· Score: 1
This is true. A good approach would be to base the problem on some-real world data. The outgoing e-mail server publishes live data once per second. Your math problem required to send through this server requires several of these values to be involved in the math problem. Also, the server needs to detect if the clients' solution to the problem is using data that is inappropriately out of date, or duplicated. This will throttle the capacity of the user to send, without relying on math problems with just the right amount of difficulty for the current level of commodity level computing power.
Ok, I get the concept that looking at distant galaxies is looking back in time due to how long it took light to get here.
But how is it that we can keep looking further and further away. Wouldn't there be a point in time beyond which we can't see since the universe just isn't wide enough to have had any light traveling for that long? i.e. if the furthest object is 10 billion light years away, then we wouldn't be able to see any further back then 10 billion years???
The only way I can see around this is if the universe expanded faster than the speed of light for a significant part of it's life. Is that the case?
You're correct. I remember trying to study the segment model in college, when everyone kept saying 'just don't use segmentation - it's too complicated'. I'm glad someone can explain it to me correctly.
But as I'm looking through the 386 manual, it turns out that only 4 data segments (besides stack) can be used simultaneuosly, because segment selectors must first be loaded into the 4 data segment registers before a segment can be accessed.....this makes it somewhat restrictive to allocate individual data structures in separate segments. But at least programs can shuffle these on-the-fly.
I've studied the 386 a lot too, and came to the same conclusion that Intel had a pretty good idea with segmentation, but missed the boat in terms of selling the idea.
The 386 is capable of allocating a segment for basically any and every string of memory a program uses. Segments can be any size and can overlap. The capability is still there, and it is 100% compatable with paging at the same time.
They missed the boat though, because they put too much effort into designing the IO protection map and some other features around the segmentation model, and didn't reallly enhance the paging support as much as they could have. The only limitation i see with segmentation is that Intel provided mechanisms for 4 levels of execution privledges, protecting succesive levels of kernel and system code from applications. But I couldn't work out how applications in the same security level are supposed to be isolated from each other. Paging does that very naturally by just making virtual memory spaces non-visible to each other.
But I always have felt that a sufficiently advanced OS could allocate buffers/strings within protected segments to avoid the exploits from overflows (the program would still crash, unless it could catch and recover from its own exception.)
This is true. Kodak could do so much more to promote it's digital photo printing services like Digital Picture Maker and Ofoto systems, but it isn't.
If you ever have a chance, drive by Kodak's main manufacturing plant in Rochester, NY. It's enormous.
Kodak's facility and work force is a giant paper mill and chemical plant. I feel they should be making every effort to find new markets for these products instead of getting stuck in the mindset that they have to stay in the photographic market by transitioning to paperless digital technologies.
There are plenty of electronics companies that can make digital cameras. Kodak is currently tearing down all of its facility in an attempt to capture this digital market. Sadly, this has been putting people out of work in Rochester at an accelerated pace the last few years.
I work with tablets, and find them to be more trouble than they are worth. To do any serious work on them, I have to add a keyboard. So then I have this stupid keyboard hanging off it like a desktop unit would. Kinda defeats the purpose of portability. Tablets are usable if you only use the machine for a specific application that only requires point and click operation.
Touchscreens are handy though, and there are plenty of laptops out there with touchscreens. Some newer models like the Panasonic CF-18 and Toshiba 3500 have swivel screens that convert the unit from laptop to tablet configuration.
The money supply isn't quite infitite because of regulations, but it is variable and many times greater than the actual amount of currency in circulation. The supply of money depends on how much cash banks are required by law to keep on hand (required reserve ratio). The more banks are allowed to loan out at any time, the bigger the money supply.
I guess I'm not the only one who believes that Microsoft has expertise with slow-down code. Isn't it funny that no matter how clean I keep my Windows install, it always keeps slowing down? Even on a fast machine, after 6 months I can't even open the 'Start' button without waiting 10 seconds.
Average joe computer user, from my experience, thinks this means time to buy a new computer... (with a new OS liscense, of course.)
"A cryogenic missile cannot be fired at a moment's notice. The fuel cannot be stored in a rocket indefinitely because it is highly explosive, so a missile would have to be fueled before launching."
Huh?! Cryogenic fuels are volatile, meaning the fuel will eventually all evaporate. But not explosive while just sitting in the tank.
Volatile does not mean explosive!
Besides the issue with interrupting high currents, this superconductor would help to keep power plants from tripping offline in the first place. When working with very high power, it is difficult to build regulators that can handle enough power. Switches/breakers are much easier to build, but they are only on-off. The superconductor apparently allows for some current regulation by varying the external magnetic fields.
Power plants trip offline because they have only 2 choices: stay online and fry, or go offline and screw all the other plants into taking more burden. This superconductor gives a much better 3rd option: stay online, but only supply the rated capacity of the power plant.
Slashdot Mirror
If we knew everything perfectly, there wouldn't be a need for probabiltiy in any branch of science.
Even if we knew of all asteroids out there, they don't always act in a way that we can predict.
In the high power industry, resistive loads often do use water. Usually just as a coolant though.
/ 37_hydropower_for_remote_alaskan_community.cfm
You do have more than a theory... I saw one article where a dumpster was filled with water, and electrodes passed a current though the water as a make-shift test load for a small-scale hydro dam.
http://www.eere.energy.gov/power/tech_access/docs
You can't be serious. Don't try this at home kiddies.
I've worked in my profession with high voltages and high wattage loads, actually. It's something that only engineers or fools should be tinkering with. If you don't know what I^2 * R is for, or how to insulate such a rig properly, then don't even think of it.
This is true. A good approach would be to base the problem on some-real world data. The outgoing e-mail server publishes live data once per second. Your math problem required to send through this server requires several of these values to be involved in the math problem. Also, the server needs to detect if the clients' solution to the problem is using data that is inappropriately out of date, or duplicated. This will throttle the capacity of the user to send, without relying on math problems with just the right amount of difficulty for the current level of commodity level computing power.
Ok, I get the concept that looking at distant galaxies is looking back in time due to how long it took light to get here.
But how is it that we can keep looking further and further away. Wouldn't there be a point in time beyond which we can't see since the universe just isn't wide enough to have had any light traveling for that long? i.e. if the furthest object is 10 billion light years away, then we wouldn't be able to see any further back then 10 billion years???
The only way I can see around this is if the universe expanded faster than the speed of light for a significant part of it's life. Is that the case?
You're correct. I remember trying to study the segment model in college, when everyone kept saying 'just don't use segmentation - it's too complicated'. I'm glad someone can explain it to me correctly.
....this makes it somewhat restrictive to allocate individual data structures in separate segments. But at least programs can shuffle these on-the-fly.
But as I'm looking through the 386 manual, it turns out that only 4 data segments (besides stack) can be used simultaneuosly, because segment selectors must first be loaded into the 4 data segment registers before a segment can be accessed.
I've studied the 386 a lot too, and came to the same conclusion that Intel had a pretty good idea with segmentation, but missed the boat in terms of selling the idea.
The 386 is capable of allocating a segment for basically any and every string of memory a program uses. Segments can be any size and can overlap. The capability is still there, and it is 100% compatable with paging at the same time.
They missed the boat though, because they put too much effort into designing the IO protection map and some other features around the segmentation model, and didn't reallly enhance the paging support as much as they could have. The only limitation i see with segmentation is that Intel provided mechanisms for 4 levels of execution privledges, protecting succesive levels of kernel and system code from applications. But I couldn't work out how applications in the same security level are supposed to be isolated from each other. Paging does that very naturally by just making virtual memory spaces non-visible to each other.
But I always have felt that a sufficiently advanced OS could allocate buffers/strings within protected segments to avoid the exploits from overflows (the program would still crash, unless it could catch and recover from its own exception.)
This is true. Kodak could do so much more to promote it's digital photo printing services like Digital Picture Maker and Ofoto systems, but it isn't.
If you ever have a chance, drive by Kodak's main manufacturing plant in Rochester, NY. It's enormous.
Kodak's facility and work force is a giant paper mill and chemical plant. I feel they should be making every effort to find new markets for these products instead of getting stuck in the mindset that they have to stay in the photographic market by transitioning to paperless digital technologies.
There are plenty of electronics companies that can make digital cameras. Kodak is currently tearing down all of its facility in an attempt to capture this digital market. Sadly, this has been putting people out of work in Rochester at an accelerated pace the last few years.
I work with tablets, and find them to be more trouble than they are worth. To do any serious work on them, I have to add a keyboard. So then I have this stupid keyboard hanging off it like a desktop unit would. Kinda defeats the purpose of portability. Tablets are usable if you only use the machine for a specific application that only requires point and click operation.
Touchscreens are handy though, and there are plenty of laptops out there with touchscreens. Some newer models like the Panasonic CF-18 and Toshiba 3500 have swivel screens that convert the unit from laptop to tablet configuration.
The money supply isn't quite infitite because of regulations, but it is variable and many times greater than the actual amount of currency in circulation. The supply of money depends on how much cash banks are required by law to keep on hand (required reserve ratio). The more banks are allowed to loan out at any time, the bigger the money supply.
Actually, I'm no Linux fan either. ...10 seconds may be the extreme case.
I'm just relating my experiences as an A+ certified computer tech. Any other experienced computer user I know feels the same sentiment.
And I'm only talking about clean installs. When I see spyware on a machine, I have no sympathy.
I guess I'm not the only one who believes that Microsoft has expertise with slow-down code. Isn't it funny that no matter how clean I keep my Windows install, it always keeps slowing down? Even on a fast machine, after 6 months I can't even open the 'Start' button without waiting 10 seconds.
Average joe computer user, from my experience, thinks this means time to buy a new computer... (with a new OS liscense, of course.)
Volatile does not mean explosive!
I had the same question and looked this up: (PDF doc)
Besides the issue with interrupting high currents, this superconductor would help to keep power plants from tripping offline in the first place. When working with very high power, it is difficult to build regulators that can handle enough power. Switches/breakers are much easier to build, but they are only on-off. The superconductor apparently allows for some current regulation by varying the external magnetic fields.
Power plants trip offline because they have only 2 choices: stay online and fry, or go offline and screw all the other plants into taking more burden. This superconductor gives a much better 3rd option: stay online, but only supply the rated capacity of the power plant.