You think they are? Well, they are not.
As long as you are running a half-decent OS which
halts the CPU when its idle it will conserve
power. Significant power that is. Depending on
your CPU, the difference will be something like
a two-digit wattage, I guess. Multiply this
with the number of CPUs and you'll end up with -
well, I can't be bothered to do the math, but I
wouldn't be surprised if we'd be talking about
the equivalent of a really decent power-plant.
Compressed hydrogen is simply not explosive. Period. It needs oxygen (or something else) to react with. It's rather unlikely that oxygen from the air sill leak INTO the pressurized container...
There are actually two factors in this canister setup which could potentially be explosive and therefore harmful:
1. The mechanical energy stored in the compressed H2.
2. The energy freed by combusting the H2 with Oxygen.
Designing the canister so that #1 is not a problem in just about any conceivable situation, is not a big problem nowadays. Fiber composite materials can be constructed so that there will be close to no shrapnel even if the canister is destroyed.
Regarding problem #2: given the situation that the canister is damaged so that the H2 will leak, you will still need oxygen to incinerate or explode the H2, which first needs to be supplied by the air, so that you don't immediately have a lot of H2/O2 mixture within the explosive range. Experiments (conducted for H2 as a vehicle fuel) show that in accident situations, the H2 will usually ignite rather easily, but due to its lower density rise very quickly and burn in a relatively harmless way above the accident site. However, traditional gasoline will spill on the street, and, when ingited, heat you slowly from below. So on average you'll probably be better of with the H2 driven vehicle.
Of course, things become more complicated in tunnels and underground parking lots, where H2 would be contained and could therefore build up large amounts of explosive mixture before. These situations could quickly become very, very messy.
I'm using exactly this system as an a/v component, but in order to silence it, I had to go to some
lengths:
I completely removed the power supply fan. To do si, I
Removed the cover of the power-supply
Attached 486 heatsinks to the two puny heatsinks in the power supply
Turned the power supply around 180 so that the new heatsinks are fully exposed to the air that comes in through the vent holes in the front.
Removed the fan in the back
Removed the CPU fan
Now here's the hard part: I added a carefully
cut-out piece of sheet aluminum horizontally into the chassis, so that the whole chassis is divided into an upper part (housing the two drive bays) and a lower part (hosing power supply and board).
In order to achieve a defined air-flow, I then added a thermo-controlled 80mm fan (Papst) to the piece of sheet aluminum right above the CPU heatsink.
The two chassis halves are now sealed. Therefore I had to cut small openings into the piece of sheet aluminum to allow the cabling to pass. In order to keem them small, I used rounded cables for IDE etc. and wrapped the power cabling with special cable wrapping tube.
The effect of the whole operation is a well-defined air-flow inside the chassis. The horizontal fan doubles as a CPU fan (at least good enough to keep a Celeron 900 at
And last but not least my Linux experiences:
Sound AC97 works
Networking works
APM works
Video (S3 Savave) works, but the Savage driver has some problems with Xv, therefore video has to be played back in the slower XShm mode.
USB works
Hardware sensors work
Firewire yet untested.
Re:Friedrich Duerrenmatt's "Der Verdacht"
on
The Pledge
·
· Score: 2
Just a minor nit pick:
There is a piece by Friedrich Dürrenmatt called "Der Verdacht" ("The Suspicion"). However, it is different from "Das Versprechen" ("The Pledge").
"The Pledge", as you mentioned, has been filmed twice under the title "Es geschah am hellichten Tag" ("It Happened in Broad Daylight"), in 1958 and 1997 which was a TV release only that I have yet to see.
Friedrich Dürrenmatt is definitely one of the most interesting writers of the last century and you should check out his writing or have a look at his works that have been filmed.
Linux High Availability project
on
Linux Failover?
·
· Score: 5
You may want to check out http://linux-ha.org/. The "heartbeat" application implements node-to-node monitoring over a serial line and UDP and can initiate IP address takeover based on a notion of resources provided by nodes and resource groups. It worked well for me. However, this was only a very basic two-node setup.
The device sold under the brand name "Yamakawa" in Germany and presumably elsewhere, is identical to the "Raite", only with a different label. Hope it helps.
I respectfully disagree. They did not shrink the image to reduce the target file size, but to make it web-compatible. Of course, shrinking the image reduces the target file size, but that is not what they wanted to achieve. The point is to keep the target file size low while maintaining a high resolution.
Of course, shrinking the image after the JPEG2k compression/decompression may have concealed some compression artifacts. Therefore it would have been a good idea to provide a detail at full resolution.
Slashdot Mirror
You think they are? Well, they are not. As long as you are running a half-decent OS which halts the CPU when its idle it will conserve power. Significant power that is. Depending on your CPU, the difference will be something like a two-digit wattage, I guess. Multiply this with the number of CPUs and you'll end up with - well, I can't be bothered to do the math, but I wouldn't be surprised if we'd be talking about the equivalent of a really decent power-plant.
Compressed hydrogen is simply not explosive. Period. It needs oxygen (or something else) to react with. It's rather unlikely that oxygen from the air sill leak INTO the pressurized container...
There are actually two factors in this canister setup which could potentially be explosive and therefore harmful:
1. The mechanical energy stored in the compressed H2.
2. The energy freed by combusting the H2 with Oxygen.
Designing the canister so that #1 is not a problem in just about any conceivable situation, is not a big problem nowadays. Fiber composite materials can be constructed so that there will be close to no shrapnel even if the canister is destroyed.
Regarding problem #2: given the situation that the canister is damaged so that the H2 will leak, you will still need oxygen to incinerate or explode the H2, which first needs to be supplied by the air, so that you don't immediately have a lot of H2/O2 mixture within the explosive range. Experiments (conducted for H2 as a vehicle fuel) show that in accident situations, the H2 will usually ignite rather easily, but due to its lower density rise very quickly and burn in a relatively harmless way above the accident site. However, traditional gasoline will spill on the street, and, when ingited, heat you slowly from below. So on average you'll probably be better of with the H2 driven vehicle.
Of course, things become more complicated in tunnels and underground parking lots, where H2 would be contained and could therefore build up large amounts of explosive mixture before. These situations could quickly become very, very messy.
Oh, yeah. BTW: the described procedure WILL void your warranty :-)
- I completely removed the power supply fan. To do si, I
- Removed the cover of the power-supply
- Attached 486 heatsinks to the two puny heatsinks in the power supply
- Turned the power supply around 180 so that the new heatsinks are fully exposed to the air that comes in through the vent holes in the front.
- Removed the fan in the back
- Removed the CPU fan
- Now here's the hard part: I added a carefully
cut-out piece of sheet aluminum horizontally into the chassis, so that the whole chassis is divided into an upper part (housing the two drive bays) and a lower part (hosing power supply and board).
- In order to achieve a defined air-flow, I then added a thermo-controlled 80mm fan (Papst) to the piece of sheet aluminum right above the CPU heatsink.
- The two chassis halves are now sealed. Therefore I had to cut small openings into the piece of sheet aluminum to allow the cabling to pass. In order to keem them small, I used rounded cables for IDE etc. and wrapped the power cabling with special cable wrapping tube.
The effect of the whole operation is a well-defined air-flow inside the chassis. The horizontal fan doubles as a CPU fan (at least good enough to keep a Celeron 900 at And last but not least my Linux experiences:Just a minor nit pick:
There is a piece by Friedrich Dürrenmatt called "Der Verdacht" ("The Suspicion"). However, it is different from "Das Versprechen" ("The Pledge").
"The Pledge", as you mentioned, has been filmed twice under the title "Es geschah am hellichten Tag" ("It Happened in Broad Daylight"), in 1958 and 1997 which was a TV release only that I have yet to see.
Friedrich Dürrenmatt is definitely one of the most interesting writers of the last century and you should check out his writing or have a look at his works that have been filmed.
You may want to check out http://linux-ha.org/.
The "heartbeat" application implements node-to-node monitoring over a serial line and UDP and can initiate IP address takeover based on a notion of resources provided by nodes and resource groups. It worked well for me. However, this was only a very basic two-node setup.
The device sold under the brand name "Yamakawa" in Germany and presumably elsewhere, is identical to the "Raite", only with a different label. Hope it helps.
I respectfully disagree. They did not shrink the image to reduce the target file size, but to make it web-compatible. Of course, shrinking the image reduces the target file size, but that is not what they wanted to achieve. The point is to keep the target file size low while maintaining a high resolution.
Of course, shrinking the image after the JPEG2k compression/decompression may have concealed some compression artifacts. Therefore it would have been a good idea to provide a detail at full resolution.
http://www.africam.com/