Follow Slashdot blog updates by subscribing to our blog RSS feed

 



Forgot your password?
typodupeerror

Comment: Re:I fail to see the point.. (Score 2) 221

by Professeur Shadoko (#36091140) Attached to: Japanese Researchers Test Flying Trains

300+ mph without all the expensive and fragile magnets required for maglev trains, while still powered by overhead electrical lines.

AFAIK a good part of the trouble they had when running the french TGV to >550km/h speeds was related to the overhead electrical lines. Waves propagating along the line and preventing a good contact between the line and the train.

Plus with this kind of train, there is no ground connection. So they would need two overhead electrical lines.

Comment: Re:BIG PROBLEM???!!! (Score 1) 73

by Professeur Shadoko (#35583924) Attached to: Kepler Recovers After 144 Hour "Glitch"

does it matter what pixels in the imager are receiving a particular star? Are they all calibrated the same or, if the star-light falls upon more than one or on a pixel boundary, can the software make adjustments so that the measurements will provide consistent data?

Looks that they designed the thing so the light of a star is not measured by a single pixel:

The CCDs are not used to take pictures. The images are intentionally defocused to 10 arc seconds to improve the photometric precision.

Comment: Re:Missing the Point (Score 1) 175

by Professeur Shadoko (#34283550) Attached to: The Problem With the Top500 Supercomputer List

> The real innovatiors should be recognized for their efforts to reduce space, power and cost

Trust me, to build a computer for the top of the top500, you have to be pretty good at these. Well, at least space and power. With over 100,000 cores, without an efficient (dense) packaging you'll need a room way too big. And a dense packaging leads to all kind of heat issues, so you have to be power-efficient.

Comment: Re:Simple fix (Score 1) 175

by Professeur Shadoko (#34283450) Attached to: The Problem With the Top500 Supercomputer List

It would hurt both the GPU and the CPU performance. Maybe not in the same way, but still.

Plus the article complaining about the use of GPUs is stupid. GPUs can be and are used to solve real scientific problems. They are not as easy to efficiently use as the CPUs, but they are almost as versatile.

Comment: Re:Primary power source? (Score 1) 356

by Professeur Shadoko (#29794811) Attached to: VASIMR Ion Engine Could Cut Mars Trip To 39 Days

No, you cannot.

Do you know that the laser used to measure the distance between the earth and the moon has a radius of over 6km when it reaches the moon, and that only one photon every few seconds comes back to the detector on earth ?

Considering how far the spaceship will be from earth, it is not even remotely possible to focus a beam precisely enough to transfer energy.

Music

+ - Music Industry Attacks Free Prince CD-> 1

Submitted by
Mike
Mike writes "You might not like Prince but he's planning on giving away a free CD in a national Sunday newspaper, but music industry executives are practically going insane over the idea and threatening to retaliate. "The Artist Formerly Known as Prince should know that with behaviour like this he will soon be the Artist Formerly Available in Record Stores. And I say that to all the other artists who may be tempted to dally with the Mail on Sunday," said Entertainment Retailers Association spokesman Paul Quirk, who also said it would be "an insult" to record stores. But wait a minute- can't Prince give away his own music if he wants to without fear of industry retaliation?"
Link to Original Source

Man must shape his tools lest they shape him. -- Arthur R. Miller

Working...