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Comment: Re:Where is the data? (Score 1) 49

by Viadd (#39538923) Attached to: JAXA Creates Camera That Can See Radiation

There are two main imaging techniques that work in moderate-energy gamma-rays: Coded Aperture which use a shadow mask; and Compton Imaging.

According to this article the camera uses Compton Imaging. In this technique you look at gamma rays that scatter off of one detector and into another. Each detector tells you where the interaction occurred and how much energy was deposited. From this information, you can derive for each gamma ray that it came from somewhere on a hollow cone (with its tip at the first interaction point.) If you detect many gamma rays you can look at where the cones intersect, and that's where the gammas are coming from.

Comment: Emergency cell tower (Score 5, Interesting) 90

by Viadd (#36922130) Attached to: Hackers' Flying Drone Now Eavesdrops On GSM Phones

How often have you heard of people who are lost in the woods/at sea, and who could have called for help if they had cell phone connectivity?

They could fly one of these as part of a search. Even if the owner isn't actively using the phone, the drone could detect the electronic serial number of each phone in its coverage area and match it against the lost person's phone.

Comment: Re:The leaking pipe isn't 5 feet in diameter (Score 1) 799

by Viadd (#32201042) Attached to: Gulf Gusher Worst Case Scenario

If it is 53 cm instead of 5 feet, then scaling from the video is off by a factor of (5 feet/53 cm)^3 = 24 and his 4 bbarrels per second becomes 15 thousand barrels per day, assuming he only made that one mistake.

This is not good, but it is closer to the mainstream media than to the Revelation-quoting Alabaman.

Comment: Re:Frist Post! (Score 1) 162

by Viadd (#30564768) Attached to: Fifth Anniversary of a Cosmic Onslaught

The energy released was mind-numbing: in one-fifth of a second, this supercharged magnetic neutron star blasted out as much energy as the Sun does in 250,000 years!"

There's no way for me to get my head around these numbers to "truly" feel it. What methods can you use to visualize such extreme numbers?

A fifth of a second is about the time it takes to blink. It's about 12 frames of a 720P HD video signal.

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NASA Tests Flying Airbag 118

Posted by samzenpus
from the drop-the-cloud-anchor dept.
coondoggie writes "NASA is looking to reduce the deadly impact of helicopter crashes on their pilots and passengers with what the agency calls a high-tech honeycomb airbag known as a deployable energy absorber. So in order to test out its technology NASA dropped a small helicopter from a height of 35 feet to see whether its deployable energy absorber, made up of an expandable honeycomb cushion, could handle the stress. The test crash hit the ground at about 54MPH at a 33 degree angle, what NASA called a relatively severe helicopter crash."
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Zombie Pigs First, Hibernating Soldiers Next 193

Posted by samzenpus
from the fattening-up-on-brains dept.
ColdWetDog writes "Wired is running a story on DARPA's effort to stave off battlefield casualties by turning injured soldiers into zombies by injecting them with a cocktail of one chemical or another (details to be announced). From the article, 'Dr. Fossum predicts that each soldier will carry a syringe into combat zones or remote areas, and medic teams will be equipped with several. A single injection will minimize metabolic needs, de-animating injured troops by shutting down brain and heart function. Once treatment can be carried out, they'll be "re-animated" and — hopefully — as good as new.' If it doesn't pan out we can at least get zombie bacon and spam."

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