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Comment: Re:That was the most worthless infomercial ever. (Score 1) 244

by PaulBu (#43477405) Attached to: Researchers Report Super-Powered Battery Breakthrough

If my cell phone can transmit 30 times farther, I'm guessing that the power will drain from the battery 30 times faster.

Assuming that your cellphone transmit unidirectionally (as it's natural for a cellphone to do!), is not getting 30 times the 'r' requires 'r^2' more power, i.e., your battery will drain 900 times faster? ;-)

Paul B.

Comment: Re:Booby trap time (Score 1) 402

by PaulBu (#42186943) Attached to: The Trouble With Bringing Your Business Laptop To China

Good idea!

Now, let's try to implement it... I suggest to start with Lenovo laptops, and we only need to outsource USB dongle and exploding battery production somewhere, I suggest China, they have experience mass-producing thing!

Wait! All your matching parts (laptop, dongle, battery) are made where? In... China? ;-)

Paul B.

Comment: There is an X11 server written in Java... (Score 1) 150

by PaulBu (#41896323) Attached to: Gate One 1.1 Released: Run Vim In Your Browser

... I think made by Citrix, and it "runs" in your browser, but I would not really recommend it to anyone. Total steaming POS...

The maskhouse we deal with uses(d) that for customers to verify that the layers are what they expect. The program they run on the other end is something from Apollo workstations era, window manager in that session was TWM (we are talking now, a decade into 21st centiry! :) ), and it was slower than when I first tried running X over dial-up modem in 90s, without compression... ;-)

So, I am not having high hopes about useability of X11-over-HTTP, but who knows...

Vim demo was impressive through!

Paul B.

Comment: Re:Yes, and they seem to re-invent wafer thinning. (Score 1) 10

by PaulBu (#41836723) Attached to: Flexible Circuits By the Slice

Sorry, the paper that you are referring to was not posted by me, but by another person in this thread -- and no, I could not read it either.

I do know (from my previous life ;-) ) that, I think, 6" III/V wafers were routinely thinned to 1 or 2 mils (25-50 um), yes, those were not 8-12", but then they were not exactly mass-produced either, and, needing backside vias and backside metal they *had* to be that thin.

And yes, I am skeptical about the yields of that "cracking" process myself, even without invoking reusing the remainder of the wafer for actual fab again, just wanted to point out that thin enough substrate will, indeed, bend, not break (at first! :) )!

Paul B.

Comment: Yes, and they seem to re-invent wafer thinning... (Score 3, Interesting) 10

by PaulBu (#41836317) Attached to: Flexible Circuits By the Slice

Yes, 1-3 mil thinned wafers feel like a piece of plastic, easily flapping around (though, I would not want to literally bend them at 90 or 180 degrees at small radius and expect them to still work). If you ever had a chance to handle a thin microscope cover slip (http://en.wikipedia.org/wiki/Cover_slip), you would know how it feels, especially if you imagine that it is 4-8 inches in diameter -- pretty flexible, monocrystalline, or not.

And, a (seemingly much more reliable) version of the process has been around for years, involves [polishing the backside of the wafer, instead of trying to "slice" through Si with a wire. See http://en.wikipedia.org/wiki/Wafer_backgrinding . By the way, after your wafer is polished down to couple of mil thickness, you can etch vias through it and deposit backside metal, to serve as a groundplane -- not a big deal for CMOS, but pretty big for high-power low-layer-count RF GaAs/InP chips.

Paul B.

Comment: Re:How does something escape a black hole? (Score 1) 74

by PaulBu (#41745595) Attached to: NASA Satellite Sees Black Hole Belching Out Hundred-Million-Degree X-rays

It was emitted before, not after cloud was absorbed into the black hole...

My favourite lines from TFA:

So maybe saying this was a belch is a bit misleading, since you do that after you eat something. This is more like your food screaming loudly and incoherently and flailing around while you’re actually eating it. Is that better?

Paul B.

Given its constituency, the only thing I expect to be "open" about [the Open Software Foundation] is its mouth. -- John Gilmore

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