Domain: uiuc.edu
Stories and comments across the archive that link to uiuc.edu.
Comments · 1,476
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Typical Windspeeds on Mars
Windspeeds of 70mph are not really excessive on Mars.
The Mariner probes detected a typical wind speed of 125mph and gusts of 300-375mph. (source)
The reason that these winds are never mentioned is that the atmosphere is so thin (0.75% of the density of Earth's) so they don't have that much force behind them.
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Re:The web was always GUI
Actually, by 1993 WorldWideWeb displayed images inline. (Development of NCSA Mosaic 0.1a began that same year.) WorldWideWeb may not have been first, but if not, it wasn't far behind.
1. Yes, the source code to the original (1990/1991?) version of WorldWideWeb can be found in the W3.org history section.
2. It definitely doesn't work on Mac OS X as-is, though I've been wondering for a few months how much effort would be required to get it working, just for kicks. -
CERN, NSCA, Netscape
"How about Cern and Tim Berners-Lee? The initial Netscape release was basically the same as NCSA Mosaic which came before it."
Just to clarify:
CERN is the European Organization for Nuclear Research (the acroynm isn't English-language). Tim Berners-Lee "created" the original web browser, WorldWideWeb, while he was working there.
Mosaic was developed at NCSA, the National Center for Supercomputing Applications at the University of Illinois in Urbana-Champaign.
Marc Andreesen and Eric Bina were the original creators of Mosaic while they were students working at NCSA. Andreesen later founded Netscape Communications (originally Mosaic Communications) to try and build a company around the success of Mosaic. -
CERN, NSCA, Netscape
"How about Cern and Tim Berners-Lee? The initial Netscape release was basically the same as NCSA Mosaic which came before it."
Just to clarify:
CERN is the European Organization for Nuclear Research (the acroynm isn't English-language). Tim Berners-Lee "created" the original web browser, WorldWideWeb, while he was working there.
Mosaic was developed at NCSA, the National Center for Supercomputing Applications at the University of Illinois in Urbana-Champaign.
Marc Andreesen and Eric Bina were the original creators of Mosaic while they were students working at NCSA. Andreesen later founded Netscape Communications (originally Mosaic Communications) to try and build a company around the success of Mosaic. -
CERN, NSCA, Netscape
"How about Cern and Tim Berners-Lee? The initial Netscape release was basically the same as NCSA Mosaic which came before it."
Just to clarify:
CERN is the European Organization for Nuclear Research (the acroynm isn't English-language). Tim Berners-Lee "created" the original web browser, WorldWideWeb, while he was working there.
Mosaic was developed at NCSA, the National Center for Supercomputing Applications at the University of Illinois in Urbana-Champaign.
Marc Andreesen and Eric Bina were the original creators of Mosaic while they were students working at NCSA. Andreesen later founded Netscape Communications (originally Mosaic Communications) to try and build a company around the success of Mosaic. -
Buy a laser... More bang per $
Seriously.... I have 3 printers
(ok, one is my wife's... She has a Sony DyeSub printer for printing out pics for her scrappbooking --- When she needs a particular size,zoom, etc.. that would take too long to figure out at walmart photodesk...)
The other 2 are an IBM Lexmar Optra R and an OLD (in printer years) HP Photosmart 1115... (before my wife got her Sony...)
The Lexmark Laser is the best! 99.9% of our printing is dull black vs. white laser printing... web Receipts, mapquest directions, recipies from family emails, etc...... This printer was a "recoverd" printer that was due to be pitched by a previous employer because it was "icky."
Seriously, someone had shipped it back to the home office to be upgraded or what ever and left the tonor cartridge in it... Needless to say, it seemed to explode somewhere during shipping... so it was marked for the dumpster... I rescued it at the 12th hour with the overlords approvial... and gave it a good vac & clean at home in the basement... had a few 1/2 used cartridges that secretaries didn't know how to work or would just replace for no reason... so I NEVER paid for a toner cartridge... It has been going strong for 5 years now! Right now, my cost per page is about -.26$ a page. :)
As apposed to my HP... Ink runs about $25-30 a cartridge... My wife wanted to print out picuters... It maybe did 1 cartridge past the initial freebee (1/2 filled) tanks... and then it's done nothing but collect dust! It cost about $120 @ Bestbuy and I was offered (just this spring) to renew my 3 year service contract for a mere $70... yeah... right... don't think so. The sad thing is it works, I just refuse to put more money into ink for it...
No photo's are printed at walmart for pennies when you bulk print them. (trust me, with a new baby of 15 months, we do! 100's at a time!) and for the scrappbooking, we now print witht he Dye-Sub...
Oh, if your still reading this, your' probibly wondering how we can afford the dye-sub cartridges... Well, we lucked out... one of the CC's offered points we never used for anything and then near christmas one year it included an online retailer that would double the $$$ value of those points if we used them online... It took a few orders to work their system to limit you to only so much spent at a time, but eventually we turned all those useless free CC perks into free photo packs for the DyeSub printer! :) My wife is such a bargin hunter, it is still one of her "BEST" deals when you ask... :)
Oh, the really nice thing about it all (if your still reading and care...) is that all the CC Perks were from buisiness trips! So they really were "FREE" in that respect... Finally getting something back from "The Man."
Ok, I'm done now...
Yes... Go away... Go on.. Read another post... ..... Seriously, scat! git!.....
Ok, now your just freaking me out... Just leave us alone... don't read anymore of this post! I mean it! I just want to end it, and you just sit there like it's your "God-Given" right to keep me typing as much as you can read...
Nooooo Go aWAY!!! Quit reading already!
Thank you!..... NO!!!!!! I mean QUIT... Don't interact with me... Don't give me a "your welcome" smug look from your slack jaw'd facE! Git! go-on now... Read something somewhere else....
Still here! Damn... Ahh... I know... This should keep you busy.. if you must, read this:
http://www.geom.uiuc.edu/~huberty/math5337/groupe/ digits.html
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NCSA Mosaic source licenseFull conditions
Summary: available free of charge for academic or internal business use.
For its time, this was a relatively permissive license, but does not qualify it as open source.
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Re:I N N O V A T I O N
It's amazing how the corporate version of history tends to suplant reality in th public mind.
The first web browser and web server would have been WorldWideWeb, the man who invented the web. http://www.w3.org/People/Berners-Lee/WorldWideWeb. html
The first widely used and popular web server and browser were NCSA httpd http://hoohoo.ncsa.uiuc.edu/ and NCSA mosaic http://archive.ncsa.uiuc.edu/SDG/Software/Mosaic/N CSAMosaicHome.html
These were developed at the National Center for Supercomputing Applications at the University of Illinois at Urbana - Champaign, IL, USA.
Many of these people would later go on to build netscape.
Apache is something of a pun, "a patchy web server." Origonally it
was a set of patches for NCSA httpd -
Re:I N N O V A T I O N
It's amazing how the corporate version of history tends to suplant reality in th public mind.
The first web browser and web server would have been WorldWideWeb, the man who invented the web. http://www.w3.org/People/Berners-Lee/WorldWideWeb. html
The first widely used and popular web server and browser were NCSA httpd http://hoohoo.ncsa.uiuc.edu/ and NCSA mosaic http://archive.ncsa.uiuc.edu/SDG/Software/Mosaic/N CSAMosaicHome.html
These were developed at the National Center for Supercomputing Applications at the University of Illinois at Urbana - Champaign, IL, USA.
Many of these people would later go on to build netscape.
Apache is something of a pun, "a patchy web server." Origonally it
was a set of patches for NCSA httpd -
BioCoRE
This might be quite-the-overkill, but I have to at least suggest it: biocore.ks.uiuc.edu.
This is actually an entire collaborative environment, allowing for group segregation, file sharing, etc., and is great for classroom use. If you take the simple tour (http://www.ks.uiuc.edu/Research/biocore/tour/) you can see what I'm talking about. -
Re:Shrinking bandwith to prevent illegal downloads
It's stupid from the perspective of the RIAA, perhaps. Quite frankly, though, university admins care far more about bandwidth than they do about stopping the Reefer^H^H^H^H^H^HMP3 Madness. If everyone and their brother never downloaded from the outside world but shared their entire MP3 collection on the dorm LANs, the admins would be a happy bunch. UIUC, by the way, gives students a ~750MB quota per 24-hour period -- but the quota does not apply to connections inside the uiuc.edu domain. Combine that with sufficient internal mirrors for the legal stuff and everyone is happy except for the RIAA. And, honeslty, raise your hands if you pity them.
Anyone? anyone? Beuller? anyone? -
Re:Indeed, this is the free market at work.
Where did you learn economics? Public goods are by definition non-rival and non-excludable. The Internet is neither excludable nor rival, is a public good, and is therefore subject to the freerider problem.
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Re:American Giant Without the Pedigree
University of Illinois is "not so good" when it comes to traditional fields?
From http://www.publications.uiuc.edu/info/rankings.htm l:
"U.S.News & World Report rates Illinois as one of the top 10 public national universities that grant doctoral degrees, according to a 2004 ranking of America's best colleges.
Illinois is among the nation's top 20 universities that grant doctoral degrees, according to an Associated Press compilation of 1995 rankings by the National Research Council.
Kiplinger's Personal Finance ranks Illinois eighth in its "100 Best Values in Public Colleges" for 2003.
The 2004 Fiske Guide to Colleges views Illinois as one of the 43 "best buys" based on the quality of the academic offering in relation to the cost of attendance.
Money magazine's 1998 guide to colleges ranks Illinois 18th in a list of the top 100 schools providing the best education for the money.
In 1998, Science Watch ranked Illinois fifth in the nation for its scientific impact on agricultural science from a field of the top 100 federally funded universities in the United States.
The University Library houses the largest public university library in the world, with more than 22 million items in the main library and over 40 departmental libraries and divisions. More than one million patrons from around the world use the online catalog each week.
Grainger Engineering Library Information Center is the largest engineering library in the country and one of the world's most technologically advanced information management and retrieval centers.
New Mobility magazine ranked Illinois first among "disability-friendly colleges" in 1998.
Dance Teacher Now magazine ranked the Illinois Dance program in the top 10 in 1998.
A 1995 study by the National Research Council placed 10 Illinois doctoral programs within the top 10 nationwide.
Chemical engineering--5
Chemistry--8
Civil engineering--5
Computer science--8
Electrical engineering--3
Materials science--5
Mechanical engineering--9
Music--10
Physics--8
Psychology- -5
According to rankings in U.S.News & World Report in 2004 (unless otherwise noted):
The College of Business ranks in the top 25 (2004) graduate colleges for business and is tied for 11th in undergraduate business education (2004).
The graduate program in the College of Education ranks 27th in the nation.
Illinois's graduate program in engineering is fourth (2004) in the country, and its undergraduate program is tied at fourth (2003).
The College of Fine and Applied Arts is tied for tenth among graduate programs in the country (1997).
The Master of Fine Arts program is listed among the top 25 in the country.
The College of Law ranks 27th among the nation's 177 accredited law schools. It is ranked among the top 10 public law schools.
The Graduate School of Library and Information Science's program is tied for first in the nation (1999).
The College of Veterinary Medicine is tied for 12th in the country (2000).
Several undergraduate programs rank in the top 25 in the country (2004).
Accountancy--2
Aeronautical engineering--7
Agricultural engineering--2
Biomedical engineering--25
Business management--13
Chemical engineering--7
Civil engineering--1
Computer engineering--4
Electrical engineering--4
Environmental engineering--4
Finance--16
Industrial engineering--12
International business--25
Insurance/risk management--6
Management info systems--15
Marketing--12
Materials science--1
Mechanical engineering--6
Nuclear engineering--8
Quantitative analysis--10
Real estate--5
More than 60 graduate programs and speciality areas rank in the top 30 in the country.
Accountancy--4
Aeronautical engineering--9
Agricultural engineering--5
Architecture--19 (1997)
Audiology--20
Biological sciences--24 (2002)
Ch -
Re:InterestingYou realize that it's only about 9:40PM now on the East Coast, right? Unless you had some east coast in mind other than the one for the U.S. That's not terribly late, you know, especially for caffeine-fueled geeks.
To steer this comment back on topic though, I'd like to thank Mr. Kilby for his tremendous accomplishment; the modern world owes much to your work (and of course to that of Mr. Noyce as well). I was at UIUC in 2000 when Jack Kilby (BSEE '47) won his Nobel Prize, and I remember the publicity at the time. He was recognized during halftime of a football game that fall- I swear he got more cheers than the team did any time that season.
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Re:A look into the pastImportant features for good Gbit performance in PC-like systems:
PCI-X: a full-width (64 bit), full-speed (133MHz, quad-clocked) PCI-X bus gives 1064Mbyte/s peak bandwidth, shared between all devices on that PCI-X segment
Multiple PCI-X segments: this is already happening on some high-end boards (e.g. the Newisys board used in Sun's quad-Opteron v40z).
Network drivers which support NAPI (e.g. Intel's PRO/1000 NICs) are much more likely to achieve Gbit speeds in practice
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another solution
the article talks about distributed computing on large scale which is not very feasible for all the above mentioned reasons like
a) companies wouldn't spend money on building this into the console
b) most consumers cannot be bothered
There will be people who'd be interested though. I'd try it if I had a ps3... However with more and more use of clustered smaller machines in place of large supercomputers, clusters of consoles have been built in unis and research labs (for example here or here. There are a few advantages to using consoles:
a) they are cheaper
b) they are small form factor
c) they have hardware optimised for computation (at least ps2 does and ps3 will).
Sony had released linux on ps2 and word is they will be releasing linux for ps3 with extensions for the Cell's SPUs. Once ps3 has a fully featured OS any scientific app can be ported and modified to run on it. Now M$ on the other hand, well, I don't see them releasing any OS for XBOX 2*Pi but maybe the xbox linux crowd will take care of that. -
Technical absurdity.
No one seems to be approaching this from the technical viewpoint, so I will try.
First the term used most often in the paper: network coding.
It looks like they're basically taking a shortcut with the bittorrent method. The neat thing is that this looks easily implemented in bittorrent. They use the term linear combination a lot which, as near as I can tell, means that they'll be doing something like this:
There will be your packets floating around just like in bittorrent. Suppose packets A, B, C, and D make up your file. The Avalanche method would work exactly like bittorrent except at some point there will also be mixed packets created. These mixed packets, the linear combination thing, would be like a packet that's actually AxorB (xor doesn't appear to be the specific function they use since they keep saying "linear combination", but it would work). The idea is that if you can get packet A, B, and C then you'll be able to get packet D by getting either D itself or AxD, BxD, or CxD. This would make the packet that you need to finish 4 times more common, and at the same time it looks like the system in this case would be handling only 10 different kinds of packets (A,B,C,D,AxB,AxC,AxD,BxC,BxD,CxD). This makes it almost twice as fast as bittorrent for finding you that last packet. The 20%-30% number seems pretty accurate.
They're likely using something more clever than a simple xor. They probably have something in their little "linear combination" algorithm that would let you get your whole file even if all you had were mixed packets. -
Re:is it really possible to cluster ps3?Are you asking about the PS3 clustering possibilities because you know about the PS2 cluster at NCSA, or because you think it can be done with Linux on board?
GTRacer
- Needs 68 more PS2s... -
Re:Anyone out there care to comment?
You can watch the load on the National Center for Supercomputing Applications online system monitor.
I can't tell you what all the little widgets mean though. All I know is that while they may be informative, they can't beat the cool blinky lights of the old Connection Machine -
Re:They do fingerprint developer seeds.No, I meant something like the downloads going through a CGI program. Instead of returning a file the web server executes a program and sends back the output of the CGI program. The program just reads from the DMG file and sends that for parts that are unaffected by the fingerprint. When sending parts affected by the fingerprint it reads from the file, applies the fingerprinting, and sends that altered data. It is easy to do. There doesn't have to be any delay because fingerprinting can be *much* faster than a download, and it is being done in parallel with the download.
I didn't know they used FTP servers but there must be some way to do this with FTP servers as well.
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University of Illinois Internet Computer Science
http://www.cs.uiuc.edu/online/
I have read good things about Department of Computer Science at University of Illinois at Urbana-Champaign when I was looking for online computer science.
I think you must enter with about 60 credits.
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Re:Why NASA?
NCSA Mosaic wasn't even around until June.
That didn't sound right to me, and indeed I was misled by a too-quick reading of this page (Which seems like it must be talking about Mosaic on Windows?).
The actual original Mosaic release notice, on March 15th, 1993: NCSA Mosaic for X 0.10 available. -
Re:So...
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Re:Not suprising.If this were the case, then the PS2 would have been subject to countless hacks
The Linux on PS/2 had some serious limitations. It didn't run on the raw hardware, it ran on a bit of an abstraction layer, that enforced some limitations, like no DVD playing, as I understand it. I saw a presentation by the one of the guys who made the compute cluster out of PS2s and he said that the access checks in that abstraction layer seriously slowed down certain operations.
Making games for PS3 Linux will probably have to deal with limitations (like the screen resolution limits on the PSP - it won't let just any program use the full native screen resolution, just ones approved by Sony) and won't be a good commercial bet since probably most people won't have a hard drive hooked up to their PS3...
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Re:It's a BS experiment.Maybe not a classic atomic bomb. But I remember reading somewhere that the Nazi bomb would have been something closer to a "dirty bomb". Which spreads radioactive material with conventional explosives.
In 1945 the Germans put their supply of uranium on a submarine, with the intention of delivering it to the Japanese. I imagine a dirty bomb would have been the most likely purpose. More information here.
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Re:I will wait awhileMaybe not a classic atomic bomb. But I remember reading somewhere that the Nazi bomb would have been something closer to a "dirty bomb". Which spreads radioactive material with conventional explosives.
In 1945 the Germans put their supply of uranium on a submarine, with the intention of delivering it to the Japanese. I imagine a dirty bomb would have been the most likely purpose. More information here.
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Re:Wow...Maybe not a classic atomic bomb. But I remember reading somewhere that the Nazi bomb would have been something closer to a "dirty bomb". Which spreads radioactive material with conventional explosives.
In 1945 the Germans put their supply of uranium on a submarine, with the intention of delivering it to the Japanese. I imagine a dirty bomb would have been the most likely purpose. More information here.
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Re:Why fixed price retail is badMaybe not a classic atomic bomb. But I remember reading somewhere that the Nazi bomb would have been something closer to a "dirty bomb". Which spreads radioactive material with conventional explosives.
In 1945 the Germans put their supply of uranium on a submarine, with the intention of delivering it to the Japanese. I imagine a dirty bomb would have been the most likely purpose. More information here.
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Re: Dirty bombMaybe not a classic atomic bomb. But I remember reading somewhere that the Nazi bomb would have been something closer to a "dirty bomb". Which spreads radioactive material with conventional explosives.
In 1945 the Germans put their supply of uranium on a submarine, with the intention of delivering it to the Japanese. I imagine a dirty bomb would have been the most likely purpose. More information here.
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Re:Biased coins -- not good enough.
No, I think you're mistaken.
The output of the system I described produces a Bernoulli RV with p precisely equal to 0.5. There are no epsilons about it. It may be some amount of trials before the system produces any output at all, but when it does, the bias on the random variable is guaranteed to be fair, right from the start.
There is no need to try to "average out" the results by performing more trials. The system you describe may make the difference between your RV and an unbiased RV "insignificant" after enough trials, but it will never be equal.
For more information, feel free to wade through this paper.
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Forseen by Bill Watterson?Bill Watterson (of Calvin and Hobbes fame) did give a speech where he did talk about cartoon syndication.
Here is the link: http://hobbes.ncsa.uiuc.edu/comics.html
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Open Source InnovationsThe open source guys can scrape together enough resources to reverse engineer stuff. That's easy. It's way cheaper to reverse engineer something than to create something new. But if the world goes to 100% open source, innovation goes to zero.
The open source guys hate it when I say this, but...
I found these three examples on one google search page. Saying something as broad as "Open Source is not Innovative" without some sort of proof to back it up just proves your talking out your rear! That statement is like saying "Innovative Products are never invented by anyone outside of a corporation"! Airplanes, the first Apple, come to mind.
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Re:CGI - don't be absurd
CGI may be stupid and dead...
I think you need to readup on what the CGI actually is.
Your statement is as wrong as if you'd said that HTTP was dead when IE claimed the browser market.
PHP, ASP, Perl, Bash - and many other languages - can use the CGI to talk to web clients over HTTP.
I think what you were trying to say is that CGI scripting in Perl is stupid and dead. I'd even disagree with that to a degree, but that's probabl;y closer to what you meant.
cLive
;-) -
Re:Interference is indeed fact...Gupta and Kumar (2001) note that Shannon (1948) was concerned with single user channels:
The last few decades have seen a tremendous growth
in wireless communication. The most popular examples are
cellular voice and data networks and satellite communication
systems. These and other similar applications have moti-
vated researchers to extend Shannon's information theory for
a single-user channel to some that involve communication
among multiple users. A few such examples are the multiple-
access channel, the broadcast channel, and the interference
channel. The exact capacity region is, however, known in the
most general case only for the multiple-access channel, while
the broadcast capacity region is known only for few specific
channels, like the additive white Gaussian noise channel and
the deterministic channel [7], and even fewer results are available for the interference channel [23]. It should be further
noted that the above applications as well as the channel models
used for analyzing them involve mainly single-hop wireless
communication.
More such papers are available from David Reed's Open Spectrum page.
But hey, it isn't my field. -
Looks great to me!
I guess whether or not you consider C to be the dominant language would depend on what you're trying to accomplish. It's far too arcane and slow to develop for a lot of the things I do, (I do most of my development in Clarion -- a blindingly fast RAD development tool) but then, C packs a hell of a punch when you need to do some tricky low-level work.
But back to the topic at hand, when/if this gets to the point that it can build DLLs (or whatever the linux/BSD equivalent is) it will be EXTREMELY useful to me. A lot of academic code that I look at when exploring new coding ideas (Such as David Goldberg's Simple Genetic Algorithm and Genetic Classifier Systems) is written in Pascal and is more understandable in that form than it would be in C. It would be great to be able to take what others have done in Pascal, tweak it a bit, build a library, and tie it directly into a Clarion/VB/C/C++ app.
A lot of work has been done in Pascal over the past decades. Not having to reinvent the wheel to make use of it seems like justification enough for a project like this.
Just my 2 cents. -
Those are mammatus clouds...
That is the correct terminology.
;) (Storm chaser and atmospheric scientist... I do know that.)
And, yes, they are named as such since they look like boobs. ("Mammatus" comes from "mammory", the milk-producing glands in mammal breasts.)
They are thought to form as parcels of air drop after loading up with precipitation.
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/c ldtyp/oth/mm.rxml
And there's the random reply to the random post...
-Jellisky -
Re:Where are all the aspect gurus?
Sounds like you need (or have already found) the observer pattern.
Graham -
Re:History repeating, in a way
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Re:No.Man, if that's obsolete... How does a machine like that compare to PCs of today? As in raw processing or graphics processing. Just curious.
Well, it's not obsolete as in useless, but when you consider how BIG the thing is and how much it costs to run and maintain, it is. I'm not positive what speed the CPUs are in it, but let's just assume they are 250mhz R10000s. Even assuming perfectly linear SMP scaling, that's still only 3ghz of processing power. If you consider than an R10k is not nearly as fast per clock as modern stuff (i.e. Power5, Opteron, etc), it's less impressive still. In other words, an average Opteron workstation is probably faster than this Onyx2.
Case in point, the Cube, which is more or less the successor to the CAVE, is powered by a few commodity PCs with high-end video cards. It can also be connected to Cassatt to run CAVE applications.
In terms of graphics performance, the InfiniteReality2 is no slouch I suppose, but it is still outmoded by current PC graphics cards. Sorry I don't have better information on that, but I'm not really a graphics person.
btw, I realised that Cassatt has _three_ IR2 pipes, not two.
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Re:Prey?Crichton should just admit he knows very little about real science
Go back a few decades when he was at the top of his game. Then his science was fairly believable. I suspect that he's now coasting on his memories of an education long past.
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Re:great result, but not really a "discovery"
Last time I checked, the sun was embedded in a vaccum as well and no one seemed to question the ability to assign a 'conventional' temperature to it.
The sun also has its own atmosphere. The temperature of that atmosphere (5000-ish degrees F) is what gives the sun its color.In any case, my beef isn't with the scienists. They did something very useful and cool, which I expect will be very useful in the very near future. My beef is with the Times and other papers like it, which post headlines of "scientists discover fusion" without any really clear idea of what any of those words really mean.
As a matter of fact, I'm not working in "science". I finished my Ph.D., but I couldn't stand the idea of spending my first 7 years as a faculty person writing papers, serving on committees, and scrambling like mad to get tenure. So I got a job where I can real work done on a daily basis.
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Re:Desktop fusion is not new...
I'm sorry if my original post sounded arrogant or accusatory. I'm honestly interested in knowing more about this technology. I'm happy to be corrected when I'm wrong, but it really helps to have sources to check.
With regard to flux, as far as I can tell, no one has reported a Fusor-style setup with a flux higher than 1E8 neutrons/second or perhaps 1E10 neutrons/second (example, example). Assuming an operating distance of 1 m, that's less than 1E5 n/(cm^2 s).
By comparison, modern reactor setups achieve 2E15 n/(cm^2 s) flux, and spallation sources can achieve 1E17 n/(cm^2 s) (see Fig 1 here). This is why I characterized a Fusor as "low flux." The flux of a Fusor is useful for some things, but for most applications of neutron beamlines, it is too weak. (Of course, more than flux matters: energy distribution also matters.)
From what I know, Fusors are great for studying some aspects of fusion reactions and maybe conducting experiments on neutron properties. I've also heard of using it for neutron interrogation (example), where you irradiate a sample and see what happens (for instance for characterizing nuclear samples, material identification, bomb detection). So, yes, it is a neutron source. However, it is not competitive with high-flux sources, and is (I think!) too weak for neutron scattering, diffraction, and imaging experiments. This is why I claimed that a fusor was not a general-purpose neutron source.
This is also why no Fusor sources are listed on any "worldwide neutron source" lists, as far as I can tell:
http://neutron.nrc-cnrc.gc.ca/links.html
http://www.ncnr.nist.gov/nsources.html
http://www.neutron.anl.gov/facilities.html
http://neutron.neutron-eu.net/n_users/n_where_the_ facilities/n_worldwide
http://www.sciner.com/Neutron/neutron_facilities_w orldwide.htm
With regard to the universities you mentioned, it looks like the PULSTAR at North Carolina State is a reactor. The TRIGA at University of Illinois at Urbana-Champaign is also a reactor. If those were not what you were referring to, then I apologize.
To recap: I relent and agree that a Fusor is indeed a viable neutron source. However, I would like to point out that its flux is much lower than other sources, making it unsuitable for many types of neutron beamline experiments. If I'm wrong about any of this, please correct me. -
Utterly wrong on so many levels...
"Linux was based on Minix. A UnixLite OS designed to run on PCs. However, it was really only a teaching tool. Andrew Tanenbaum repeatedly refused to add the new (legitimate) features the users and even developers asked for. Linus Torvalds set out simply to add functionality to his own version of Minix (the copyright allows use to do so for your own personal use, but you cannot sell or distibute it).
Over time, in adding functionality to Minix, Linus Torvalds found that he had created an entirely new kernel. I was very similar to Minix but used none of the Minix source code..."
(Who modded the preceeding garbage "Informative!?)
Linux began as a development that was hosted on a pc running Minix. Linus set out, from the start, to create a posix compatible kernel of his very own. The idea that he created the kernel by accident is as laughable as it is insulting.
See here for a a rather more factual account of the development of the Linux kernel.
T&K. -
Hostile code - forges SSL certsIt's more than spyware. This thing reroutes all your browser traffic through their proxy. That's how they see what you're doing. It includes rogue SSL certificates so it can capture encrypted connections. Yes, they get to see all your credit card numbers. Major universities, including UCIC, UCLA, UC Riverside, UCSD, Texas Tech, Windsor, UNC, Old Dominion, Michigan, Iowa, McGill, Carlton, Cornell, American University, Stanford, and Columbia are blocking conections to Marketscore for this reason. If you have Marketscore installed at one of those schools, you get a warning page like this.
Some banks also block online banking sessions coming in via Marketscore's proxies.
This is the same spyware previously known as "netsetter". There's no question about this being spyware.
Here's Stanford's Information Security Office's statement on Marketscore.
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Security Alert: MarketScore Spyware
11 Jan 2005MarketScore (also called NetSetter) is a spyware-like application that compromises the security of all data sent or received by your web browser, even on "secure" encrypted web sites. All external browser communications are re-routed through MarketScore's proxy servers, so they have access to any "secure" traffic/passwords/accounts that otherwise would be encrypted.
If you have MarketScore installed on your computer and have used your browser for any services that require WebLogin, your password should be considered compromised. After you have removed MarketScore from your computer, we strongly recommend that you change your SUNet password. This advice also applies to any other secure web sites you may have visited with your browser.
The Information Security Office is directly contacting owners of machines that appear to behave as if MarketScore is present.
Technical Detail
MarketScore reconfigures the browser to use a "proxy server" for all non-local connections, including HTTPS connections. A proxy server is a machine that acts as a middle-man, brokering web page requests intended for other sites. So if the browser on machine A wants to visit web sites C, D, and E it makes all those requests through the proxy server B. B then contacts C, D, and E and passes the results back to A. This is usually transparent to the user on machine A after the browser has been configured to use the proxy.
Web proxies are typically used in a corporate environment where all web traffic must be controlled or inspected centrally, although in the case of secure HTTPS traffic there is ordinarily nothing the proxy can do except forward the connection or refuse it. In this case, the proxy servers belong to a company called ComScore where they collect and analyze the intercepted data.
While ordinarily an HTTPS connection would simply pass through a proxy securely, in this case MarketScore also installs a new root certificate in your browser so that it can decrypt all intercepted SSL connections (a "man-in-the-middle" attack) without triggering a security warning from the browser. In normal operation, browsers would complain if a site certificate doesn't match the domain of the URL, but the new root certificate tells the browser to trust ComScore's site certificate for any URL.
This goes well beyond what Marketscore claims their program does.
That seems to settle the issue.
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Security Alert: MarketScore Spyware
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Re:Is anyone else curious what SSA trees are?
Yes, I was curious what SSA trees are, so I clicked the link. I realize this is slashdot, but do try and overcome your fears and RTFA or just google it to find this paper on SSA.
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Re:More like Navy than pleasure ship
Don't forget that they can have things that the Navy doesn't have. Things like swimming pools, racquetball courts, bowling alleys, high class restaurants and movie theaters. If they are smart they will have a lecture hall with guest speakers like Donald Knuth (I don't know if he personally would go, but speakers of his class). Not to mention live bands.
Since they are not moving (at least not far, if they want to be close to LA) they don't have to worry about people swimming/diving in the ocean around the ship. You could take a boat and go fishing, or just fish off the side of the ship. Have to be careful to remain in international waters, but that isn't too hard if you pay attention.
If it were me I'd make this into a real cruise ship, and travel a little. When an executive wants to meet with his underlings he boards in L.A. (the workers without VISAs can't get off, but they can enter US waters if I understand law), and gets off in Mexico City. It is a working vacation, but give the executive the full first class cruise experience while he is not working.
Note that this is all things they can do. They can also turn it into another Triangle Shirt factory. Your guess is as good as mine about what it will really be like. My guess is it will be somewhere in between. Not the full luxury cruise after work, but not slave labor either.
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Re:The biggest downside to Firefox
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Re:Sweet Dreams Steve
Or he could have dreams of this guy. I love the shirt... its almost too funny to be true.
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Sweet Dreams SteveSurely Steve Jobs dreams of scenes like this.
Anyone know what sort of crazy discount they get? It must be pretty good PR for apple.
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Re:Marketing and Religion.