Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror
×

Comment Re:I thought I felt (Score 1) 166

Many years ago I had a summer job at the TRIUMF cyclotron. When you stood above the main magnet (on top of a thick layer of concrete shielding blocks) the field was strong enough that you could hold one coin vertically and stick another one onto its bottom edge.

The stray field was too weak to affect credit cards or hard drives, but it did do interesting things to the CRT monitors in nearby offices.

Comment Re:.6 percent (Score 1) 144

And just how, pray tell, do you think they measure the mass of the bars Mr. Nitpicker? Some elaborate physics experiment?

Using either a beam balance, or a force-measuring scale that's locally calibrated with a known reference mass.

Comment Wrong units (Score 4, Insightful) 144

It's sometimes an acceptable shorthand to express a weight in grams, but not when that's the whole point of the story. The _mass_ in grams is (hopefully) not changing. The _weight_ in newtons (or any other dimensionally-correct unit you prefer) is what's changing.

If you're using a device that measures weight and reports it in grams, then you need to re-calibrate it against a known reference mass at each new location.

p.s. don't forget about buoyancy. Accurate measurements need to be done in a vacuum chamber.

Businesses

LightSquared Satellite Disabled By Last Week's Solar Storm 70

volts writes "Troubled LightSquared's primary Skyterra 1 satellite has been out of service since the solar storm on March 7. The company says it is 'working through the rebuild of the satellite tapping into the resources that were involved in the original program.' This development follows a stream of bad news including layoffs, default on payments, the resignation of CEO Sanjiv Ahuja and FCC rejection of a scheme to repurpose satellite frequencies for cellular data due to interference with GPS. Another kick in the teeth as company struggles to avoid bankruptcy."

Comment Re:What's the point of these? (Score 2) 273

Ostensibly, they allow for more brains behind the card than is possible with a magstripe.

You get that benefit from having a microprocessor on the card, such as a standard "chip card" with metal pads (like a SIM card) that you insert into the reader. Adding all of the RFID nonsense on top of that just makes it less secure.

(I'm aware that "chip+pin" also has known security flaws, but it's better than the alternatives).

Comment Re:Kinda sucks (Score 2) 556

It's not quite that simple. Although ethanol has a lower energy content, it has a higher "octane number" and can be used at higher (more efficient) compression ratios than regular gasoline. An engine specifically designed for E85 wouldn't necessarily be much less efficient than one designed for standard gasoline.

However, cellulose-derived butanol is probably a better long-term solution.

Hardware

Video Timothy Lord Checks Out Keyboards & Tech At CES 59

Slashdot's Timothy Lord is at the International Consumer Electronics Show (CES) in Las Vegas. There is no way any one person can take in the whole show. It's just too big for that. But on Timothy's first day, he spotted an overlay keyboard for the iPad that's been mentioned on Slashdot before, an invisible keyboard for your smartphone or tablet, and a crazy-interesting all-in-one computing device with a built-in projector and built-in virtual keyboard. Watch the video and join Timothy as he learns about these three devices. (Before you ask: Yes, we'll have more videos from CES over the next few days.)"

Comment Re:Wait a minute. (Score 1) 112

There's more to life than just "calories". You also need a supply of amino acids to make new proteins (such as enzymes), and if there aren't enough of these in your diet then the only option is to break down muscles or other important tissues. Fat reserves can be used as energy and can even be used to synthesize glucose for the organs that require it, but there's no way to make amino acids from fat.

Slashdot Top Deals

To do nothing is to be nothing.

Working...