- cypherpunks-legacy - lists.cpunks.org

update.545 (fwd)
by Jim Choate 29 Jun '01

29 Jun '01

---------- Forwarded message ---------- Date: Wed, 27 Jun 2001 13:34:00 -0400 (EDT) From: AIP listserver <physnews(a)aip.org> To: physnews-mailing(a)aip.org Subject: update.545 PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 545 June 27, 2001 by Phillip F. Schewe, Ben Stein, and James Riordon ALL-OPTICAL BEC. Physicists at Georgia Tech have created and stored a Bose-Einstein condensate (BEC) of rubidium atoms in a trap using only laser beams, without the cumbersome magnet coils employed in traditional magneto-optic traps (MOTs). BECs have been transferred into purely optical traps before but this is the first time such a trap has produced the condensation itself, in which thousands or millions of atoms fall into a coherent single quantum state. What are the advantages of an optical design and why are BEC scientists excited about this result? (1) In the Georgia Tech approach the BEC occurs within seconds rather than in tens or hundreds of seconds. (2) Expensive, voltage-regulated power supplies for the magnets are no longer needed. (3) Atoms (such as magnesium or strontium) or molecules with magnetic moments not suitable for conventional traps, can be studied. (4) The faster condensation lessens the need for high vacuum. (5) Without bulky magnets all around, it will be easier to move the condensate into other enclosures, such as into cavities where interactions between the BEC and single photons can be studied. (Barrett et al., Physical Review Letters, 2 July2001; contact Michael Chapman, 404-894-5223, michael.chapman(a)physics.gatech.edu. Additional note: Physical Review Letters will, as of its 2 July issue, move to a continuous online publication, according to which an article's publication date will coincide with the day on which it is posted online; its print date will be the cover date of the paper issue of PRL in which the article appears in printed form. Furthermore, the printed cover of each issue will carry an illustration from one of the articles therein. The first such figure is associated with this all-optical BEC story.) SEMICONDUCTING MAGNETS AT HIGH TEMPERATURE. For water the melting temperature is where crystal turns to liquid. For magnets the Curie temperature is the point above which the lined-up spins of a ferromagnet fall out of alignment and the material becomes nonmagnetic. Recently the calcium-boron compound CaB6, doped with lanthanum, was observed to retain a modest ferromagnetism at temperatures as high as 900 K, surprising for a compound not containing the traditional magnetic metals such as nickel or iron. Now physicists in The Netherlands (Paul Kelly, University of Twente, p.j.kelly(a)tn.utwente.nl, 31-53-489-3166) suggest that CaB6 is not a metal, as has been thought, but actually a semiconductor. One obstacle so far to the realization of spintronics, the kind of electronics in which electron spin and not just electron charge plays a part, has been the difficulty of mixing semiconductors and magnetic metals. Hence the value of a semiconductor that starts out as a magnet and remains magnetic well above room temperature. Spintronics analogues of typical semiconductor functions, such as rectification and amplification, would now be possible.. In addition to magnetic sensor and memory applications, entirely new possibilities such as reprogrammable logic might be brought within reach. (Tromp et al., Physical Review Letters, 2 July 2001) ULTRAVIOLET FROM LEDs AND FEL's. Light at almost any wavelength is a useful tool for exploring the material world, but as the wavelength shrinks more information can be encoded into a given light pulse and, when used in a microscope, the light will have greater resolving power. Here are two notable examples of attaining ultraviolet radiation. First, scientists at Argonne's Advanced Photon Source have achieved UV radiation at a wavelength of 385 nm in a free-electron-laser (FEL) setup. In an FEL a beam of high energy electrons is sent through a sequence of magnets which cause the electrons' trajectory to undulate in such a way as to make the electrons radiate light which in turn interacts with the electrons. The researchers hope to extend their method up into the x-ray region (Milton et al., Science, 15 June 2001). The second result, from physicists at the National Institute for Materials Science in Tsukuba, Japan is a report of UV emission (235 nm) from a light emitting diode (LED) made by putting a boron-doped diamond layer up against a phosphorus-doped diamond layer. (Koizumi et al., Science 8 June 2001 -- ____________________________________________________________________ Whereof one cannot speak, thereof one must be silent. Ludwig Wittgenstein The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage(a)ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------

1 0

Re: What's up with cyberpass?
by Brian Minder 29 Jun '01

29 Jun '01

You might want consider moving to a different node. cyberpass has consistently had problems and the list manager does not respond to emails. Thanks, -Brian lne.com minder.net ssz.com On Fri, 29 Jun 2001, Trei, Peter wrote: > For a few days now, a growing (and now 100) > percentage of my cpunks email has consisted > of blank messages from > owner(a)cypherpunks.cyberpass.net > > >From the number and time distribution of the > messages, I suspect I'm getting one for each > posting to cypherpunks. > > Am I the only one who is seeing this? > > (Reply directly, since I'm not getting > intelligable mail from the list). > > thanks, > > Peter Trei > ptrei(a)rsasecurity.com

1 0

What's up with Cyberpass?
by Ray Dillinger 29 Jun '01

29 Jun '01

Cyberpass is sending blank emails onto the list. Can somebody please make it stop? Also, I strongly suspect regular mails are not getting though, so this message is in part a "ping".... Bear

1 0

Second Amendment/Bill of Rights Pistol
by Duncan Frissell 29 Jun '01

29 Jun '01

For those of you who want to defend the Bill of Rights a bit more assertively, Jews for the Preservation of Firearms Ownership and Investment Arms, Inc. have produced a Second Amendment Commemorative Pistol. Based on the 1911 Colt .45 auto pistol, and limited to a run of 100, the gun sells for $2495.00. In addition to a lot of 2nd amendment commentary on the slide, the whole Bill of Rights are engraved on the artificial mother-of-pearl pistol grips. Photos of the gun are available on the JPFO website: http://www.jpfo.org/pistol.htm And more information can be had at the Investment Arms website: http://www.investmentarms.com/ DCF

1 0

What's up with cyberpass?
by Trei, Peter 29 Jun '01

29 Jun '01

For a few days now, a growing (and now 100) percentage of my cpunks email has consisted of blank messages from owner(a)cypherpunks.cyberpass.net >From the number and time distribution of the messages, I suspect I'm getting one for each posting to cypherpunks. Am I the only one who is seeing this? (Reply directly, since I'm not getting intelligable mail from the list). thanks, Peter Trei ptrei(a)rsasecurity.com

1 0

McVeigh trial cost: $13.8 million
by Greg Newby 29 Jun '01

29 Jun '01

>From http://dailynews.yahoo.com/h/nm/20010629/ts/crime_mcveigh_dc_1.html , an article on the high cost of seeking the death penalty. Unfortunately, it doesn't give any details on the average cost of a "regular" trial...but of course, this was no regular trial, so an average wouldn't be meaningful. For the enterprising list readers among us: it sounds like providing expert testimony is a pretty lucrative vocation! -- Greg -- McVeigh's Bombing Trial Cost $13.8 Million DENVER (Reuters) - Oklahoma City bomber Timothy McVeigh (news - web sites)'s 1997 trial in Denver cost U.S. taxpayers $13.8 million, according to figures released on Friday by U.S. District Judge Richard Matsch who presided over the trial. McVeigh was executed on June 11 in a federal prison in Terre Haute, Indiana for the 1995 bombing of the Alfred P. Murrah federal building (news - web sites) that killed 168 people and injured hundreds others. The figure, which includes $6.7 million for 19 lawyers, only covers expenses until Aug. 14, 1997, the day McVeigh was sentenced to die. In cases where defendants cannot afford to pay for their own defense, the U.S. taxpayer picks up the tab. Costs for support staff for the attorneys, housing and security came to nearly $1.5 million and investigators were paid nearly $2 million. A little more than $3 million was paid to experts who testified in the trial on McVeigh's behalf. Travel expenses added up to $541,885, although some of that expense also covered work done for McVeigh's former army buddy and co-defendant Terry Nichols who was tried separately and sentenced to life in prison for his role. The court expects to release figures on the cost after the sentencing, but no date has been set for that, Matsch's spokesman, James Manspeaker said.

1 0

Whats up?
by Jon Beets 29 Jun '01

29 Jun '01

Whats up with all the blank messages coming through the list... Am I the only one gettting these? Jon Beets Pacer Communications

2 1

Chronically homeless with 10 children...
by Jim Choate 29 Jun '01

29 Jun '01

http://www.Kuro5hin.org/?op=displaystory;sid=2001/6/27/1642/41038 James Choate Product Certification - Operating Systems Staff Engineer 512-436-1062 jchoate(a)tivoli.com

1 0

Hackers delay censorship busting software
by Jim Choate 29 Jun '01

29 Jun '01

http://www.cnn.com/2001/TECH/internet/06/29/hackers.delay.sw.idg/index.html James Choate Product Certification - Operating Systems Staff Engineer 512-436-1062 jchoate(a)tivoli.com

1 0

Thought-A-Day
by Fountain Of Joy 29 Jun '01

29 Jun '01

"You can't build a reputation on what you're going to do." --Henry Ford ***************************************************************************** Your name has been recommended to receive thoughts of wisdom from Fountain of Joy.These refreshing thoughts will be delivered,free of cost,to your desktop,everyday,for an initial evaluation period.We believe that the meaningful insights of these carefully selected thoughts will bring peace,success & happyness in your life. If you would like your near and dear ones to receive these thoughts,please send their email addresses to amaha(a)vsnl.net We apologise if this email is received by you in error.If you desire to unsubscribe,reply to this email with 'remove' in the subject line. Thank you. ----Director, Fountain of Joy (Non-religious Organisation)

1 0