So, how much energy can you get from combusting a gallon of gas? If an engine was completely efficient, how far should it push 1ooo pounds?
This isn't an easy question to answer.
What sort of assumptions are you making on wind resistance? At 55 mph, most of the output of an engine goes into fighting wind resistance.
Which "completely efficient" are you asking about? A heat engine has a maximum potential efficiency that varies based on operating temperature, and is always (for reasonable conditions) much less than 100% of the heat energy being converted into mechanical energy.
What sort of track are you driving on? Rolling resistance is a significant factor at low speeds.
If you were driving on the moon (no air) on a perfectly flat maglev track (no rolling resistance), you could keep going almost forever on however much gas you wanted to use to get up to speed. In the real world, fuel economy seems to top out at around 50-60 mpg.
Unless you feed the gas into a fuel cell, you aren't going to get much above 30% efficiency. There's a fundamental limitation on the efficiency of heat engines, based on the operating and environmental temperatures, and modern automobiles are getting quite close to that limit.
1) Take a highly-efficient small engine. 2) Modify for even more efficiency. 3) Attach to 80 pounds of framework, gas tank, and wheels. 4) Drive 9.6 miles at 15 mph. 5) ??? 6) Profit?
Connection #1 is a cable modem with the cabling running in a conduit on the outside of the apartment building. Connection #2 is a regular modem with the wiring running through the building interior. Two separate ISPs, with separate POPs. The only common failure point is the mainboard of the computer functioning as a router -- absolutely everything else is redundant.
Admittedly, the switchover time isn't impressive, and the backup connection is slow, but I've never been without internet service.
So I should install an antivirus program on my Mac to protect other people on the off chance that I accidentally download a Windows program to it, and then re-upload the program I didn't want to download in the first place? Perhaps I should just install antivirus software on my ethernet cable -- it would make just as much sense.
Its or, the question is that. If it in entendement suffering, taking the belts and the arrows of fortune insolente is more splendid or arm against a sea of efforts to finish and, in one is opposed, it.
If you have a computer connected to the internet that is capable of communicating to other computers, either directly, via email, whatever, you have an obligation to take basic precautions to not inadvertantly fuck someone else up. Security through obscurity doesn't work; neither does security through obliviousness.
Why should I install an anti-virus program on my Mac? There are no viruses for it in the wild these days.
Likewise, why should I install an anti-virus program on my Linux box? The next Linux virus I hear about will be the first.
I find problems with almost every OS out there. For example, with NFS it is possible to assume root on your own box, and modify peoples files on the file server.
A properly-configured NFS server will treat a remote root user just like any other non-privileged user, ie. someone logged in as "root" can only modify those files owned by root.
Some NFS servers go a step beyond, and refuse write access to a remote root user.
I seem to remember seeing notes from a KDE conference where there was a presentation about Qt4, and KDE plan was to make the next major release use it. I think I misunderstood or KDE plans have changed, since they released 3.3 beta1 with a very ambitious release schedule.
I think you did. KDE 3.3 is a minor release, while KDE 4 will be a major release.
Strictly speaking, it's not an exploit in Mozilla/Firefox. It's a hole that can be used to access exploits in other software -- basically, it can turn what was a local exploit into a remote one.
On the other hand, pretty much nothing I can do will help me. Physics is working against my getting sattelite reception from my appartment. Unless someone comes up with a way to position a satelite near the north pole, I have too much building in my way.
There is. It's called a "statite" -- basically, it uses a solar sail to balance against the pull of gravity.
What's the up-front cost? $0.50/GB isn't good for small-scale jobs if the drive costs $4000.
My backup system is pairs of 80GB hard disks in cold-swap drive bays. Up-front cost for the system is $100 for two bays + a high-quality RAID 1 card. Per-gigabyte cost is around $2/GB, for two IDE hard drives and cold-swap drive sleds.
Really gives "anti-virus protection" a more sinister meaning. Hopefully the white hats can produce counter-agents as fast as the black hats can make harmful strains.
There's this thing called an "immune system". Computers don't have 'em. People do.
I'd say they didn't. Among other things the government couldn't do was keep the states from threatening to invade each other. Fortunately, we got the Constitution-based government before any wars started.
Slashdot Mirror
So, how much energy can you get from combusting a gallon of gas? If an engine was completely efficient, how far should it push 1ooo pounds?
This isn't an easy question to answer.
What sort of assumptions are you making on wind resistance? At 55 mph, most of the output of an engine goes into fighting wind resistance.
Which "completely efficient" are you asking about? A heat engine has a maximum potential efficiency that varies based on operating temperature, and is always (for reasonable conditions) much less than 100% of the heat energy being converted into mechanical energy.
What sort of track are you driving on? Rolling resistance is a significant factor at low speeds.
If you were driving on the moon (no air) on a perfectly flat maglev track (no rolling resistance), you could keep going almost forever on however much gas you wanted to use to get up to speed. In the real world, fuel economy seems to top out at around 50-60 mpg.
Unless you feed the gas into a fuel cell, you aren't going to get much above 30% efficiency. There's a fundamental limitation on the efficiency of heat engines, based on the operating and environmental temperatures, and modern automobiles are getting quite close to that limit.
The formula:
1) Take a highly-efficient small engine.
2) Modify for even more efficiency.
3) Attach to 80 pounds of framework, gas tank, and wheels.
4) Drive 9.6 miles at 15 mph.
5) ???
6) Profit?
Just for the record, the original term was 17 years from the date the patent was granted. It's now 20 years from the date of filing.
emerge sync && emerge --update world
The nice thing about standards is that there are so many to choose from.
Mine really is redundant:
Connection #1 is a cable modem with the cabling running in a conduit on the outside of the apartment building. Connection #2 is a regular modem with the wiring running through the building interior. Two separate ISPs, with separate POPs. The only common failure point is the mainboard of the computer functioning as a router -- absolutely everything else is redundant.
Admittedly, the switchover time isn't impressive, and the backup connection is slow, but I've never been without internet service.
Remove that red tip and then you get visits from your friends in the local PD and ATF.
You're going to get the visits anyway. The red tip will save you from getting shot when they visit.
Apple went to BSD.
Novell is going to Linux.
Windows...?
The next generation of Windows will be based on UnixWare.
So I should install an antivirus program on my Mac to protect other people on the off chance that I accidentally download a Windows program to it, and then re-upload the program I didn't want to download in the first place? Perhaps I should just install antivirus software on my ethernet cable -- it would make just as much sense.
"Genuine Copper Bust of Abraham Lincoln -- only $9.99!"
And the lucky purchaser received a nice envelope containing a small cardboard stand -- and a penny.
But was it a shiny penny?
If you have a computer connected to the internet that is capable of communicating to other computers, either directly, via email, whatever, you have an obligation to take basic precautions to not inadvertantly fuck someone else up. Security through obscurity doesn't work; neither does security through obliviousness.
Why should I install an anti-virus program on my Mac? There are no viruses for it in the wild these days.
Likewise, why should I install an anti-virus program on my Linux box? The next Linux virus I hear about will be the first.
I find problems with almost every OS out there. For example, with NFS it is possible to assume root on your own box, and modify peoples files on the file server.
A properly-configured NFS server will treat a remote root user just like any other non-privileged user, ie. someone logged in as "root" can only modify those files owned by root.
Some NFS servers go a step beyond, and refuse write access to a remote root user.
I seem to remember seeing notes from a KDE conference where there was a presentation about Qt4, and KDE plan was to make the next major release use it. I think I misunderstood or KDE plans have changed, since they released 3.3 beta1 with a very ambitious release schedule.
I think you did. KDE 3.3 is a minor release, while KDE 4 will be a major release.
One named "hidden"? It's there in Mozilla too.
Strictly speaking, it's not a hole in Mozilla. It's a "feature" that can be used to turn local holes in other software into remote holes.
Well, for all those who are browser-shopping, FireFox gets marked off the list of contenders. Who's next?
NCSA Mosaic?
Strictly speaking, it's not an exploit in Mozilla/Firefox. It's a hole that can be used to access exploits in other software -- basically, it can turn what was a local exploit into a remote one.
http://www.secondlife.com
On the other hand, pretty much nothing I can do will help me. Physics is working against my getting sattelite reception from my appartment. Unless someone comes up with a way to position a satelite near the north pole, I have too much building in my way.
There is. It's called a "statite" -- basically, it uses a solar sail to balance against the pull of gravity.
If you want simple syntax, try Brainfuck or Befunge.
What's the up-front cost? $0.50/GB isn't good for small-scale jobs if the drive costs $4000.
My backup system is pairs of 80GB hard disks in cold-swap drive bays. Up-front cost for the system is $100 for two bays + a high-quality RAID 1 card. Per-gigabyte cost is around $2/GB, for two IDE hard drives and cold-swap drive sleds.
Really gives "anti-virus protection" a more sinister meaning. Hopefully the white hats can produce counter-agents as fast as the black hats can make harmful strains.
There's this thing called an "immune system". Computers don't have 'em. People do.
I'd say they didn't. Among other things the government couldn't do was keep the states from threatening to invade each other. Fortunately, we got the Constitution-based government before any wars started.