He should have power wherever he is anyway. How do they power their communication gear? It should be possible to get either 12V from vehicles or mains AC from generators.
Having just gone through the misery of removing the viruses from a relatives computer it is quite likely that he wasn't getting Symantec.
My relatives don't call me so much anymore for that sort of thing. I don't know why, exactly... I have a very potent anti-virus tool. It's called "FORMAT C:". Works every time.
Yeah but regenerative braking doesn't work when the voltage out of the traction motor is less than the battery voltage. Electric vehicles use brake pads below a certain speed for this reason. My suggestion is to just waste power to that the motor can be used as a brake at slow speed. Doing that saves on maintenance because magnetic fields don't wear out the way brake pads do.
Maybe EVs would still have a mechanical emergency brake, possibly single use.
Same can be said about our current dilemma. You want to have cleaner air, and help the environment, etc... Well here is how you do it: Its called walking. Alternative crazy machines like "Bikes". Also the concept of "Mass Transportation", etc... This isn't new technology, its called being responsible.
The US urban environment, with a very low population density, has been created by the petrol powered car. It pretty much locks people in those places into cars.
My bet is that while early EV's will have brake pads and shock absorbers like IC vehicles it will be more economic to power the motors backwards to bring the vehicle to a stop. Shocks can be solenoids, both sourcing and sinking energy. Batteries will be the major maintenance item but they easily be made user removable (see mobile phones) so you won't need a mechanic for that.
I don't see any reason why an EV couldn't go 100 or 200 thousand km without a service.
The funnier bit is that electric motors were actually in use decades before internal combustion engines. Electric cars are among the first cars built and the technology (if you stick with lead acid batteries) has changed little in the last hundred years.
So electric cars are actually the cheap, proven technology here.
The first electric motor using electromagnets for both stationary and rotating parts was demonstrated by Ãnyos Jedlik in Hungary in 1828. Jedlik built an electric motor-propelled vehicle that same year.[1]
But European countries also invest in public transport by building rail systems, and encouraging medium to high density construction. The USA has a very low urban population density. They are stuck with private transport for this reason. If fuel prices go through the roof they will be stuffed.
Of course with a ~25% round trip efficiency from electricity->hydrogen->electricity hydrogen is still not that great a way of storing energy.
I think methane would be a better medium for energy transmission and storage because it can be liquefied at higher temperatures. And if your energy source is solar thermal, losses aren't such a big issue. You just need to build bigger generating plants.
If CD Players and DVD players are your guide, the price of electric cars will come down when they're mass produced in China and sold in Wal*Mart.
And it could happen, too. Internal combustion engines need a lot of expensive metal. Electric drive lines can be made with less metal and should cost less, both for labour and materials.
I used to worry about rewrites on my eeepc. But I have installed ubuntu twice in the last month and the disk seems to be exactly the same as it was initially so I don't worry any more.
If a secure link like this is ever set up most of the stuff going through it will be.doc and.xls files anyway. Workstations on that network will be easy fodder for viruses, etc.
The Americans practically run the Australian security services anyway. They just have to ask and they get what they want. As for the Chinese and Russians you may have a point there but I doubt using a few links with quantum crypto will add any useful security. Like plugging a sieve.
he should add 1 second to each time and suddenly it's not a fact from their timetable, it's his own creative work that merely HAPPENS to be close to theirs. no harm done.
What about if the application just functions as a browser for the rail company web site? That way the user is downloading the time table as per normal. I don't see them taking action against web browser writers.
I am at a loss to understand why the Australian Government would want this standard of security. This requires a dedicated fibre so it only works over a short range and over a land line. The bulk of security issues would be with international communications (say diplomatic stuff), wireless communications (police, military etc) and office networks (the federal public service).
But quantum won't help you in any of those cases. Oh well. I doubt I will hear if it is ever actually used.
QKD is considered the world's toughest security because the slightest attempt to intercept the one time keys, coded into lasers at the quantum level, will disrupt the beam.
Slashdot Mirror
30 years from now, people will think how stupid it was that you had to wait for your favorite TV show to come on at a specific time.
I think it is stupid now, and I grew up watching TV.
He should have power wherever he is anyway. How do they power their communication gear? It should be possible to get either 12V from vehicles or mains AC from generators.
Having just gone through the misery of removing the viruses from a relatives computer it is quite likely that he wasn't getting Symantec.
My relatives don't call me so much anymore for that sort of thing. I don't know why, exactly ... I have a very potent anti-virus tool. It's called "FORMAT C:". Works every time.
Can I interest you in my sure fire cancer cure?
Yeah but regenerative braking doesn't work when the voltage out of the traction motor is less than the battery voltage. Electric vehicles use brake pads below a certain speed for this reason. My suggestion is to just waste power to that the motor can be used as a brake at slow speed. Doing that saves on maintenance because magnetic fields don't wear out the way brake pads do.
Maybe EVs would still have a mechanical emergency brake, possibly single use.
At high school on an Apple II I once wrote a mathematical expression which looked a bit like boobs.
Same can be said about our current dilemma. You want to have cleaner air, and help the environment, etc... Well here is how you do it: Its called walking. Alternative crazy machines like "Bikes". Also the concept of "Mass Transportation", etc... This isn't new technology, its called being responsible.
The US urban environment, with a very low population density, has been created by the petrol powered car. It pretty much locks people in those places into cars.
Recently my car got crushed by stuff falling off the roof of a business.
Don't you hate it when that happens?
I am waiting for the MEIV to become available.
My bet is that while early EV's will have brake pads and shock absorbers like IC vehicles it will be more economic to power the motors backwards to bring the vehicle to a stop. Shocks can be solenoids, both sourcing and sinking energy. Batteries will be the major maintenance item but they easily be made user removable (see mobile phones) so you won't need a mechanic for that.
I don't see any reason why an EV couldn't go 100 or 200 thousand km without a service.
So electric cars are actually the cheap, proven technology here.
I had a squiz at the wiki:
The first electric motor using electromagnets for both stationary and rotating parts was demonstrated by Ãnyos Jedlik in Hungary in 1828. Jedlik built an electric motor-propelled vehicle that same year.[1]
But European countries also invest in public transport by building rail systems, and encouraging medium to high density construction. The USA has a very low urban population density. They are stuck with private transport for this reason. If fuel prices go through the roof they will be stuffed.
That $0.56/litre Australian. Last night I paid $1.20. The USA has very cheap fuel by world standards.
Of course with a ~25% round trip efficiency from electricity->hydrogen->electricity hydrogen is still not that great a way of storing energy.
I think methane would be a better medium for energy transmission and storage because it can be liquefied at higher temperatures. And if your energy source is solar thermal, losses aren't such a big issue. You just need to build bigger generating plants.
The money doesn't come out of thin air.
Neither does electricity.
Electricity comes from thick moving air.
If CD Players and DVD players are your guide, the price of electric cars will come down when they're mass produced in China and sold in Wal*Mart.
And it could happen, too. Internal combustion engines need a lot of expensive metal. Electric drive lines can be made with less metal and should cost less, both for labour and materials.
Cheap, proven technologies are still steps down a dead end road.
So I should give up my bicycle and kayak then?
I used to worry about rewrites on my eeepc. But I have installed ubuntu twice in the last month and the disk seems to be exactly the same as it was initially so I don't worry any more.
Victoria, Australia.
If a secure link like this is ever set up most of the stuff going through it will be .doc and .xls files anyway. Workstations on that network will be easy fodder for viruses, etc.
The Americans practically run the Australian security services anyway. They just have to ask and they get what they want. As for the Chinese and Russians you may have a point there but I doubt using a few links with quantum crypto will add any useful security. Like plugging a sieve.
Feel free to provide him valuable feedback.
I think I have a few DVD ISO's floating around here somewhere...
he should add 1 second to each time and suddenly it's not a fact from their timetable, it's his own creative work that merely HAPPENS to be close to theirs. no harm done.
Add five minutes to the time for more accuracy.
OTH the time table had to exist before it was released to the public. The additional cost of putting it on the web can't have amounted to much.
What about if the application just functions as a browser for the rail company web site? That way the user is downloading the time table as per normal. I don't see them taking action against web browser writers.
I bought a book on configuring sendmail. It did a pretty good job of selling me on qmail.
I am at a loss to understand why the Australian Government would want this standard of security. This requires a dedicated fibre so it only works over a short range and over a land line. The bulk of security issues would be with international communications (say diplomatic stuff), wireless communications (police, military etc) and office networks (the federal public service).
But quantum won't help you in any of those cases. Oh well. I doubt I will hear if it is ever actually used.
QKD is considered the world's toughest security because the slightest attempt to intercept the one time keys, coded into lasers at the quantum level, will disrupt the beam.
What if you cross the beams?
Don't!