I use an Ehiem pump for my PC watercooling. It's been going strong for 3 years of regular use. My aquarium's Ehiem pump has been flawless running for 5 years non stop.
Decent water pumps are built *very* well. Ceramic bearings with magnetic drive - very little wear/friction.
Fans on the other hand tend to crap out pretty quick as they fill up with dust, bearings dry out etc.
Unregulated wall-wart plug packs are actually reasonably efficient - losses in a transformer are minimal (5%), and the diode losses are around 10% (1.2V bridge rectifier) on a 12V system. The big problem is older linear regulators.
That said, with the advent of switch mode power supplies, AC - DC conversion can be as good as 95% - 98%.
Having a 12V system in the house would be interesting, but you'd need some serious wire to cope with the current you'd start to consume (lower voltage = higer current for same power output) - you could easily have 20 * 1A devices around the house. You'd also be picking up alot of mains noise on the cable. Finally, 12V is quite alot for modern low voltage (3.3V) electronics, so you'd end up with another round of DC-DC conversion going on anyway.
I was under the impression that a worm was self spreading by exploiting a vulnerability in the target.
After reading the security response, it's clear that this is just a virus exe that uses messenger as a transport. The only vulnerabilities that this exploits is "ID 10 T User Errors".
1: Surround COMPLETELY the device with shielding, ala TEMPEST. Ground the shielding.
Gee...that's *really* simple when you have i/o to deal with.
Yes, you can have isolation, but it's not perfect and still vulnerable to damage. Your controller might survive, but i/o might be destroyed, yay!
Re:Not that dangerous...
on
Nuclear Batteries
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· Score: 2, Interesting
That's mostly true - alpha emitters are normlly quite safe to handle.....however if they are breathed in or ingested, they can be quite dangerous as they can be in direct contact with healthy cells.
For example, burning them would be bad.
Re:New addition to the Patriot Act?
on
Nuclear Batteries
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· Score: 1
I would think that this sort of battery would have to be a radioactive thermo-generator (RTG) which works by taking the heat generated from radioactive decay and turning it directly into electricity.
You are wrong. Perhaps you should have RTFA.
This article is discussing very small batteries (milliwatts capability) for powering miniature electronics and MEMS devices. The energy is generated by conversion to mechanical power then electrical (eg via piezoelectric cantilevers).
The information (state) can be read instantly, but it takes time to distribute the media (for want of a better word).
1) Basically you make some entangles particles (whether they be photons or atoms), and at this point they have an unknown, but equivalent state.
2) You then need to physically transport those particles to different places (by optical fibre, motorbike courier or pack camel)
3) When you read the state of one particle, it forces the particle to choose a state. The other particle also takes on the same state when it is measured in the same way.
4) When combined with a third particle, information about that third particle can be transported instantly by forcing the system to choose states. The caveat is - you had to send one of the particles to the other side in advance.
It's not a 0.2 seconds delay, that's jus tte rotational speed.
The positional feedback loops in servos are practically instant. They can apply a torque very rapidly, with the only real delay being a very small amount of slack/elasticity in the gear train.
A customised linux firewal distribution like Smoothwall, ClarkConnect or eSmith would be by far the easiest way for you. They are generaly very easy to setup and require little to no linux experience.
Under some of these distros, the file erver can be the same machine, but it is no reccomended. Every service you add on the forewal machine increased the risk of a vulnerability. Most of the time you would be fine, but there is still a risk.
The firewall PC can be very low powered - Pentium 100MHz with a 2GB drive or less. Your file server may want to be much higher spec'd.
just require a very thorough, detailed, and precise rating system, and enforce it
I think Australia does a pretty good job of this. Most regular shows are G or PG rated, but when any slightly adult content show is due to appear, there are a few seconds taken for an informative warning/rating screen.
Eg, the following program contains: * Occasional coarse language * Nudity * Adult themes etc...
The effect of microwaving a piece of meat is due to the power level, not the overall exposure.
1000 Watts of a microwave heats the meat enough to cause cooking. The rate at which energy is added is higher than the rate it dissipates, so the equilibrium temperature goes up.
30mW from a wifi device does not cause enough of a temperature increase to cause any harm.
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I use an Ehiem pump for my PC watercooling. It's been going strong for 3 years of regular use. My aquarium's Ehiem pump has been flawless running for 5 years non stop.
Decent water pumps are built *very* well. Ceramic bearings with magnetic drive - very little wear/friction.
Fans on the other hand tend to crap out pretty quick as they fill up with dust, bearings dry out etc.
"In this house we obey the laws of thermodynamics!"
I dont really agree with this.
Unregulated wall-wart plug packs are actually reasonably efficient - losses in a transformer are minimal (5%), and the diode losses are around 10% (1.2V bridge rectifier) on a 12V system. The big problem is older linear regulators.
That said, with the advent of switch mode power supplies, AC - DC conversion can be as good as 95% - 98%.
Having a 12V system in the house would be interesting, but you'd need some serious wire to cope with the current you'd start to consume (lower voltage = higer current for same power output) - you could easily have 20 * 1A devices around the house. You'd also be picking up alot of mains noise on the cable. Finally, 12V is quite alot for modern low voltage (3.3V) electronics, so you'd end up with another round of DC-DC conversion going on anyway.
That's what I was thinking.
I was under the impression that a worm was self spreading by exploiting a vulnerability in the target.
After reading the security response, it's clear that this is just a virus exe that uses messenger as a transport. The only vulnerabilities that this exploits is "ID 10 T User Errors".
I dont even know why people use VB.net. It's quite a leap from VB6, so why not do the sensible thing and just use C# straight up.
I was quite suprised when I switched from Visual Basic (forgive me please, I'm an Engineer) to C# that I could no longer re-code whilst debugging.
It was a bit of a shame really, albeit inspiring me to program better in the first place.
[sarcasm] Yeah, but does it fly? [/sarcasm]
1: Surround COMPLETELY the device with shielding, ala TEMPEST. Ground the shielding.
Gee...that's *really* simple when you have i/o to deal with.
Yes, you can have isolation, but it's not perfect and still vulnerable to damage. Your controller might survive, but i/o might be destroyed, yay!
That's mostly true - alpha emitters are normlly quite safe to handle.....however if they are breathed in or ingested, they can be quite dangerous as they can be in direct contact with healthy cells.
For example, burning them would be bad.
I would think that this sort of battery would have to be a radioactive thermo-generator (RTG) which works by taking the heat generated from radioactive decay and turning it directly into electricity.
You are wrong. Perhaps you should have RTFA.
This article is discussing very small batteries (milliwatts capability) for powering miniature electronics and MEMS devices. The energy is generated by conversion to mechanical power then electrical (eg via piezoelectric cantilevers).
I agree. Im no MS fanboy, but everyone has been far too quick to call this a "Microsoft problem".
The media doesnt help - the sort of headlines I was seeing on the news when this story came up helped to feed the ignorance.
The pebbles are contained in silicon carbide, so I dont see how they will burn. They are stable up to 2800 degrees.
The information (state) can be read instantly, but it takes time to distribute the media (for want of a better word).
1) Basically you make some entangles particles (whether they be photons or atoms), and at this point they have an unknown, but equivalent state.
2) You then need to physically transport those particles to different places (by optical fibre, motorbike courier or pack camel)
3) When you read the state of one particle, it forces the particle to choose a state. The other particle also takes on the same state when it is measured in the same way.
4) When combined with a third particle, information about that third particle can be transported instantly by forcing the system to choose states. The caveat is - you had to send one of the particles to the other side in advance.
Agreed.
I've made my stand by refusing to install steam - my mates and I now only play the older CS 1.5 non-steam version at LAN games.
It's not a 0.2 seconds delay, that's jus tte rotational speed.
The positional feedback loops in servos are practically instant. They can apply a torque very rapidly, with the only real delay being a very small amount of slack/elasticity in the gear train.
Agred. This post needs modding up.
A customised linux firewal distribution like Smoothwall, ClarkConnect or eSmith would be by far the easiest way for you. They are generaly very easy to setup and require little to no linux experience.
Under some of these distros, the file erver can be the same machine, but it is no reccomended. Every service you add on the forewal machine increased the risk of a vulnerability. Most of the time you would be fine, but there is still a risk.
The firewall PC can be very low powered - Pentium 100MHz with a 2GB drive or less. Your file server may want to be much higher spec'd.
Bullshit.
Software takes significant time (thus money) to maintain, plus you need to improve the product all of the time to stay ahead of competition.
You win!
just require a very thorough, detailed, and precise rating system, and enforce it
I think Australia does a pretty good job of this. Most regular shows are G or PG rated, but when any slightly adult content show is due to appear, there are a few seconds taken for an informative warning/rating screen.
Eg, the following program contains:
* Occasional coarse language
* Nudity
* Adult themes
etc...
Many people would argue that #3 still applies.
What about when 100 users want 4Gbps each over a comms link?
High bandwidth LAN has it's place, because in many situation the uplinks are bottlenecks.
Absolutely! Where are those mod points when you need them.
You still need 3.1 Kg of water to re-hydrate it though. In many situations, that's still going to mean carrying it.
The effect of microwaving a piece of meat is due to the power level, not the overall exposure.
1000 Watts of a microwave heats the meat enough to cause cooking. The rate at which energy is added is higher than the rate it dissipates, so the equilibrium temperature goes up.
30mW from a wifi device does not cause enough of a temperature increase to cause any harm.