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Comment: How short before you aren't a laser? (Score 2) 24

by davidwr (#43842983) Attached to: Graphene Yields Another Trick: Ultrashort Laser Pulses

Is a single photon considered an "uber-short beyond all uber-shortness" laser pulse?

If not, what about to arbitrary successive photons in a laser beam - if all of the photons before and after them were diverted, would these two photons together constitute an extremely short laser pulse?

If the answer to either is yes, how many "laser beam photons" in a row do you need (assuming a single-photon-wide beam) before whether the beam is a "laser" or not has any practical significance? Or is a single-photon-wide laser beam in and of itself either so impractical to make or so "not different" from a non-laser single-photon-wide beam that the question is purely academic?

Not being a physicist, I don't know the answer. But I'm curious to find out.

Comment: Just filter or distill it (Score 1) 325

by davidwr (#43834101) Attached to: German Brewers Warn Fracking Could Hurt Beer

Yeah, it will raise costs but you don't need beer to live.

Now, if the chemicals start affecting tap water or the wells people drink out of, well, mister, them's fightin' words!*

*"Oh, what, cheap energy for all in exchange for drinking poison? I'm flexible." - the unspoken words many in the public are actually thinking but don't dare say.

Comment: Application: RAM-backed flash drives (Score 1) 295

by davidwr (#43769747) Attached to: Charge Your Cellphone In 20 Seconds (Eventually)

Ordinary RAM is superior to flash memory in most applications.

Imagine a solid-state storage device that was essentially a flash device with a largish (GBs) capacitor-backed-up non-write-through RAM cache, with the cache only "writing through" when certain conditions existed, such as power loss.

You would only need a few seconds of juice on the capacitor and a smart onboard SSD controller to effectively make "wearout due to writes" a non-issue for most SSD applications.

Bonus points - I/O will almost always be at the faster RAM speed not the speed of the persistent storage chips (subject to limits imposed by the SATA or other communications interface, of course).

Heck, for "cheap" bulk storage skip the solid-state non-volatile stuff and just have a capacitor+ large RAM cache on a traditional spinning piece of metal. Hey, which is cheaper, a 4GB-RAM backed 750GB solid-state device or a 4GB-RAM-backed 750GB 2.5" drive?

Comment: Re:Same company is going after Canadians (Score 1) 225

by davidwr (#43733029) Attached to: Federal Judge Dismisses Movie Piracy Complaint

if a person removes all evidence of downloaded movies from their computer and denies downloading anything or ever possessing any "pirated" material can they still be found guilty?

First off, this is a civil case, so "guilty" isn't the right word.

But, generally, yes, if you are found to have destroyed evidence that you knew or that a reasonable person would have or should have known would be needed in a future court case, the court can sanction you. The typical sanction is to instruct the jury to assume the destroyed material would have been the worst possible thing for you in this case.

If you destroyed it before being sued or it was destroyed as part of an automated system before you reasonably could protect it, you will likely fare much better.

The evidence against you in a piracy case is not just the existence of the downloaded file, but the traffic coming into your network and the evidence that all other plausible explanations have been dealt with.

Comment: Alford Plea done right (Score 1) 225

by davidwr (#43732979) Attached to: Federal Judge Dismisses Movie Piracy Complaint

Done right, an "Alford Plea" and "no contest" please would amount to "I'll do the crime, but I won't carry any public record, and the charges will be completely dismissed the day my prison/parole/probation is ended and all fines are paid."

Now, I would go along with a recommendation that for any crime with a legal record that won't go away after a year or two (i.e. anything worse than a traffic ticket, jaywalking, stealing a piece of candy, etc.), an Alfred Plea or a straight-up guilty plea be accepted only after the prosecution has proven their case to a judge by preponderance of the evidence, and that all such pleas include automatic leave to re-open the case if new evidence appears AND a judge rules that the new evidence, plus the old evidence, would result in a rejection of the guilty plea because the total evidence no longer tilts towards guilt.

For traffic tickets, I have no problem with people just pleading no contest and paying the fine. In jurisdictions where the police get ticket-happy the media usually does their job and shines a light on the problem, eventually.

"355/113 -- Not the famous irrational number PI, but an incredible simulation!"

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