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Comment Lame article (Score 4, Insightful) 359

Basically rehashes the Washington Post article from last week. Consensus: always possible to add clothes. Only so many clothes can be taken off, and it's not just men in 3-piece suits who sweat. Can buy personal heaters. Can't buy personal air conditioners. Deal with it.

Submission + - $340 Audiophile Ethernet Cable Tested->

An anonymous reader writes: Ars Technica has done a series of articles that attempt to verify whether there's any difference between a $340 "audiophile" Ethernet cable and a $2.50 generic one. In addition to doing a quick teardown, they took the cables to Las Vegas and asked a bunch of test subjects to evaluate the cables in a blind test. Surprise, surprise: they couldn't. They weren't even asked to say which one was better, just whether they could tell a difference. But for the sake of completeness, they also passed the cables through a battery of electrical tests. The expensive cable met specs — barely, in some cases — while the cheap one didn't. It passed data, but with a ton of noise. "And listeners still failed to hear any difference."
Link to Original Source

Comment Re:Why not both? (Score 4, Informative) 239

It's called an "inverter" air conditioner. It produces a variable-frequency AC sine wave from the DC voltage. The variable-frequency to the compressor changes the cooling output, so instead of turning the air conditioner on and off as the temperature wanders back and forth across the set point, it varies the frequency to keep the temperature steady.


It is brilliant.

Sharp already sells these air conditioners. They're just removing the DC rectifier circuit and running directly on DC instead of starting with 50hz or 60hz AC.

Comment Re:Why not both? (Score 4, Informative) 239

High AC voltages have induction losses. They don't travel as well as low voltages.


The goal is to send lots of watts, not lots of amps or volts. Low amperages travel well. High amperages don't travel at all -- they lose most of their energy to heat. Simple transformers (which are basically just coils of wire) can swap amps for volts so that lots of watts can travel a long distance at low amperages.

Comment Re:DC power? (Score 5, Informative) 239

Basically, Sharp is eliminating the rectifier circuit from one of their existing products. Sharp currently sells it as an 'Inverter Air Conditioner".

Unlike most air conditioners, inverter air conditioners are always-on. The inverter varies the -frequency- of alternating current sine wave in order to change the cooling output of the air conditioner. It continuously outputs just enough cooling to maintain a steady temperature in the room.

To do this, the A/C converts the incoming wall power to DC and then back to variable frequency AC. Eliminating the initial AC to DC conversion here makes good sense.

Comment Loser of a case (Score 1) 1

This is a loser of a case. If the annotations are official legal guidance of the state of Georgia then it's not copyrightable. If they're a third-party creation owned by a third party then Georgia has no standing to bring suit. That's for the third-party to do.

Sounds like they're playing fast and loose with the rules.

Comment Re:What Security Experts Can Learn From Non Expert (Score 1) 112

Even better, move all applications to the web, so everything runs on central servers which are much easier to manage and secure than a fleet of personal computers. Give users Chromebooks or another thin client configuration and don't let them install software.

This is presumptuous. You're a security guy. You don't know enough about the myriad and varied work the company's employees do to make birght-line rules about how they must do it. Nor will you with any amount of training.

Comment Re:What Security Experts Can Learn From Non Expert (Score 1) 112

> All of those things are worthless with a user base that does not respect and actively subverts security.

Framing the situation that way is a mindset that guarantees catastrophic security failure.

Hear hear! The user base doesn't actively subvert security unless security is obtrusive and overbearing. Subverting security is too much effort.

Fear is the greatest salesman. -- Robert Klein