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Quiet Cooling With a Copper Foam Heatsink

Neil Boekend Re:Kickstarter warning (142 comments)

For silence you do need a large fan (or no fan). SilentPC's goal is to make silent PC's and that means no small fans rotating at high speed but big fans rotating leisurely.
Or no fans at all. Convection can be quite strong if you build the thing as a chimney.

about half an hour ago
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Quiet Cooling With a Copper Foam Heatsink

Neil Boekend Re:Hmmm... (142 comments)

Theoretically, probably, yes.
However, the efficiency will probably just not look good enough once you see what you have to pay for it.

This same foam structure but with some trick causing thicker strands at the bottom would be a nice approximation.
Perhaps it is possible to centrifuge the thing before cooling the copper? Copper would flow over the strands to the bottom side, thus the bottom would have thicker strands.

42 minutes ago
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Quiet Cooling With a Copper Foam Heatsink

Neil Boekend Re:Old news. (142 comments)

But it didn't use foam; just rudimentary heat sinks and a well-planned ducting system. Oh yes, and the heat it generated melted the solder used to connect the monitor to the motherboard in the first few batches that came off the line, until they started using higher tolerance solder.

Wow, talk about a wrong solution to the problem! If your solder joints are melting the IC's they connect to the PCB are also taking a heavy beating. Or did they use GaAs? (probably not, seeing as it was only $2600 in 1986)

about an hour ago
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Quiet Cooling With a Copper Foam Heatsink

Neil Boekend Re:As Flammable as Steel Wool? (142 comments)

Copper corrodes fast when the temperature is raised.
At my old job we worked with copper coated strip at 310 C. If you turned the N2 protection gas over the oven off the damn thing would turn black in seconds. Corroded.

I don't know what it'll do at higher temperatures but at 310 C it corroded fast.

1 hour ago
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Quiet Cooling With a Copper Foam Heatsink

Neil Boekend Re:Perfect (142 comments)

Insulating foams are usually closed cell foams because that traps the air. Flowing air would kill the insulation.
In this foam the cells are far from closed. They are designed to be as open as possible. In that case there is flow, and a lot of it. What matters next is the surface area to dump heat through. Open foam has a lot of surface area.

The material does matter. Copper is still a good conductor, while most insulating materials are made of plastics. Plastics are already quite decent thermal insulators.

There is no fan in this design. "your fan better not die" isn't applicable.

1 hour ago
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Enceladus's 101 Geysers Blast From Hidden Ocean

Neil Boekend Re:Astrobiology (38 comments)

To be fair, this is a relatively broad description. Most descriptions require H2O.

yesterday
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Popular Android Apps Full of Bugs: Researchers Blame Recycling of Code

Neil Boekend Re:Laziness (143 comments)

Probably mostly speed. Understanding every tool you use means you must invest time to understand it. In the swift and agile world of app development security is the first victim. Taking time to understand what you are doing seems to be outdated.
The only thing the users can do is not install apps that request rights they have no need for. Sadly most users do not care.

2 days ago
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How Bird Flocks Resemble Liquid Helium

Neil Boekend Re:That's good. (40 comments)

Of course not. Birds don't run, they fly.

2 days ago
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Black Holes Not Black After All, Theorize Physicists

Neil Boekend Re:Infinitely dense? (225 comments)

Neither am I, but the Schwarzschild radius is not the singularity. It's just a radius around the singularity where the escape velocity exceeds the speed of light.
The singularity is in the middle of that. Assuming it exists, it has no volume but it has mass. Any mass divided by 0 volume is infinite density and problematic math.

2 days ago
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World Health Organization Calls For Decriminalization of Drug Use

Neil Boekend Re:Finally! (474 comments)

I see no problem in keeping tobacco legal. Just not in public spaces that are not specially designed to cope with the problems it generates.
Same with weed. At home or in a coffee shop: no problem (assuming it doesn't clash with work). In a train: big problem.
Heroin: while I wouldn't LIKE a user shooting up during my morning commute it doesn't hurt me (assuming the user doesn't leave used needles in the seat) so it shouldn't be illegal.

3 days ago
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'Optical Fiber' Made Out of Thin Air

Neil Boekend Re:What a silly title ... (115 comments)

Just increase the energy on the surrounding laser beams to evaporate any water in it's path. That way it can also double as a security measure.

about a week ago
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China Plans Particle Colliders That Would Dwarf CERN's LHC

Neil Boekend Re:Earthquakes? (218 comments)

China is big. Saying China is prone to earthquakes is akin to saying the USA is prone to earthquakes.

about a week ago
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World Health Organization Calls For Decriminalization of Drug Use

Neil Boekend Re:Finally! (474 comments)

As much left in peace as a drug addict who injects everyone they meet with a bit of their crap.

I don't care about the damage a smoker does to themselves. I care about the crap they dump in the air I need to breathe.
Smoking at home is no problem. Smoking in your own car is no problem. Smoking in the train is a problem. Smoking in a restaurant is a problem.

about a week ago
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MIT's Ted Postol Presents More Evidence On Iron Dome Failures

Neil Boekend Re:Rubbish (454 comments)

Since there are reports of missiles exploding above people's heads and missile shrapnel dropping in target areas (a lot better than a functional warhead) I would assume that Iron Dome works after the booster phase. If it worked in the booster phase the shrapnel would fall short of the target area.
To defend against missiles in the boost phase they would have to react incredibly fast. That may be possible with future advances like THEL or similar laser based missile defenses. Laser is fast. missiles are relatively slow.

about a week ago
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MIT's Ted Postol Presents More Evidence On Iron Dome Failures

Neil Boekend Re:Actual Israeli - Iron Dome Works (454 comments)

I suppose when I've personally seen rocket cases shredded to pieces, it was because they blew up by themselves in the sky.

Well, seing as how qassam rockets are build exploding by themselves may account for some of them.

about a week ago
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MIT's Ted Postol Presents More Evidence On Iron Dome Failures

Neil Boekend Re:No Access (454 comments)

How many things are blown up by rockets doesn't mean much if you don't know how many rockets were send. It only tells you it's not 100%.

about a week ago
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Rocket Scientist Designs "Flare" Pot That Cooks Food 40% Faster

Neil Boekend Re:Improving cooking is not easy. (204 comments)

Yeah, well, that single wok was about three times as expensive as the rest of my pots and pans. But it is just sooo awesome.

about a week ago
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French Blogger Fined For Negative Restaurant Review

Neil Boekend Re:Barbara Streisand award (424 comments)

"There weren't many dog turds in the food"
"The rats were really nice"
"I won't post an extensive review because that would mean getting sued or lying"

about two weeks ago
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Selectively Reusing Bad Passwords Is Not a Bad Idea, Researchers Say

Neil Boekend Re:This makes sense. (280 comments)

If a bank lets you use ONLY a password to access your accounts it is clear that they do not care much about theft. The rest of their security will be similarly crappy. I would trust them with my mortgage. Not my savings or payment accounts.

My bank requires me to log in with a unique single use code. That code is generated by a "random reader". To generate a code I need to put my PIN card in that reader and enter the PIN.
After I have logged in I still need to sign my transactions. Also with a single use code generated by my random reader. This signing code requires me to enter a single use code that is generated by the bank and displayed on the signing page. Each signing event needs a different code, each code generates a different signing code to enter on the signing page (to prevent some man in the middle attacks.). Next I need to enter the total amount on my random reader (to prevent large problems in other man in the middle attacks).
For large amounts I also need to enter the bank account number in my random reader (to prevent large problems in other man in the middle attacks).

The app is slightly less secure once activated, but you need to sign (with the process described above) to activate your account number on that phone. If you never do that there are no phones that can access your account via the app. You can only pay to known bank accounts with the app. Only those you have already paid to (with the extensive signing procedure).

I like my bank. They have actually spend time to secure transactions. They have found ways to secure it without much hassle (the random reader is easy).
Maybe that is because they are on the hook if they can not prove that I authorized the transaction myself.

about two weeks ago

Submissions

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Google privacy policy change

Neil Boekend Neil Boekend writes  |  more than 2 years ago

Neil Boekend (1854906) writes "Dear Google user,
We're getting rid of over 60 different privacy policies across Google and replacing them with one that's a lot shorter and easier to read. Our new policy covers multiple products and features, reflecting our desire to create one beautifully simple and intuitive experience across Google.
We believe this stuff matters, so please take a few minutes to read our updated Privacy Policy and Terms of Service at http://www.google.com/policies. These changes will take effect on March 1, 2012."

Link to Original Source

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