HDTenEightyP/NetNews huggingface dataset:
From: 910436a@darwin.ntu.edu.au
Newsgroups: sci.physics
Subject: Hot Phonon effect?
Date: 7 Apr 92 16:03:54 +0900

Hot Phonon effect

Could anybody out there explain what a hot phonon effect is...what are the 
chracteristics of a hot phonon...higher frequencies?

Ms Thila
NTU
Australia
From: jng@tjhsst.vak12ed.edu (Judy Ng)
Newsgroups: sci.physics
Subject: Help--quotations of physicists
Date: 14 Apr 92 03:27:24 GMT
Organization: Virginia's Public Education Network

I am a physics teacher at Jsmes Madison High School in Fairfax
County, Nothern Virginia.  Recently I have started a project on
buiolding a hypercard stack on "Physicists" The stack has
several components: a calendar of their birthdays, a list of
the Nobel Laureates and the major work of each, a short
paragraph of each physicists including the scientists of
antiquity....I also want to add a section consists of
quotations by a physicist or about a physicist.  If any of you
has a quotation to contribute, please E-mail it to me Iwill be
very grateful as you see, at present I hardly have any, and
don't know where to research for them.  This is going to be a
long term project, may be a year or two, I will keep expand the
stack and add on to it. So there is no deadline, anytime, you
comeacross a quotation, please send it to me.  Thank you
Judy Ng     jng@tjhsst
James Madison High School
2500 James Madison Drive
Vienna, Va 22181
From: gilligan@bldrdoc.gov (Jonathan M. Gilligan)
Newsgroups: sci.physics
Subject: Re: Help--quotations of physicists
Date: 16 Apr 92 01:00:56 GMT
Organization: National Institute of Standards and Technology

In article <1992Apr14.132650.4847@ux1.cso.uiuc.edu> eer36024@uxa.cso.uiuc.edu (Erik Reuter) writes:
>
>I do not like it, and I am sorry I ever had anything to do with it.
>      -- E. Schrodinger [on quantum mechanics]
> 

The quotation, according to John Bell (he doesn't say where he got it), is

If we have to go on with these damned quantum jumps, then I'm sorry that I
ever got involved.

from Speakable and unspeakable in quantum mechanics (Cambridge, Cambridge,
1987) p. 201.

---Jon
From: lordSnooty@cup.portal.com (Andrew - Palfreyman)
Newsgroups: sci.physics
Subject: Re: Time
Date: Thu,  9 Apr 92 12:00:08 PDT
Organization: The Portal System (TM)
  <1992Apr8.230752.19883@kakwa.ucs.ualberta.ca>

How about "in a universe devoid of any matter, time does not exist" ?
 --------------------------------------------------------------------------
| lord snooty @the giant | wolfpack, silver, down to the water             |
| poisoned electric head |              andrew palfreyman@cup.portal.com   |
 --------------------------------------------------------------------------
From: ronnie@cisco.com (Ronnie B. Kon)
Newsgroups: sci.physics
Subject: What is space-time?
Date: 9 Apr 92 02:38:36 GMT
Article-I.D.: csl.1992Apr9.023836.13990
Organization: cisco Systems, Incorporated

Consider a section of space-time which contains a perfect vacuum.  What
is the space-time?  Does it have temperature (3 degrees K)?  How does
it exist?  It must be curved (in a relatavistic universe) so there must 
be something to be curved.  But if there is something, it must be 
constructed of particles, so it can't be a vacuum.  Or is space-time
not constructed of particles?  If not, what can it be constructed of?  Will
space-time and matter be unified one day?  (No, I don't expect a definitive
yes.  Maybe a definitive no though).

-------------------------------------------------------------------------------
Ronnie B. Kon           |  "If you vote Republican, does that make you
ronnie@cisco.com        |   an accomplice to their crimes?"
(415) 688-4592          |                  -- Bongo, Life in Hell
-------------------------------------------------------------------------------
From: sichase@csa1.lbl.gov (SCOTT I CHASE)
Newsgroups: sci.physics
Subject: Re: simple question
Date: 8 Apr 92 19:32:12 GMT
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
Distribution: na
Reply-To: sichase@csa1.lbl.gov
NNTP-Posting-Host: 128.3.254.196
News-Software: VAX/VMS VNEWS 1.3-4   

Did I say C13?  I meant C14.  Oops.

-Scott

Newsgroups: sci.physics
From: puchm@marsh.cs.curtin.edu.au (Richard Puchmayer)
Subject: Re: Time
Organization: Curtin University of Technology
Date: Thu, 9 Apr 1992 11:04:28 GMT

Hi All,
     Didn't Hawkins book 'a brief history of time' put a preferred
     direction on time ?

     (Short term memmory is the first to go)
     Richard.
--
Richard Puchmayer == puchm@marsh.cs.curtin.edu.au      | Some of us are poets,
Masters Student at Curtin University of Technology, WA.|  some of us are not!
-------------------------------------------------------+------------------------
I know nothing, so can hold no opinions for myself or others...
Newsgroups: sci.physics
From: sawyer@sscvx1.ssc.gov (Lee Sawyer)
Subject: Re: Baryon quark idea
News-Software: VAX/VMS VNEWS 1.4-b1  
Organization: Superconducting Super Collider Laboratory
Date: Thu, 16 Apr 1992 19:38:00 GMT

In article <9204161853.AA11528@ucbvax.Berkeley.EDU>, jscott@winvmc.VNET.IBM.COM (Jonath writes...
>...
>If every baryon was held together by one of these functions (call it a
>"baryon quark") with charge Q = +2 and baryon number B = 1, rather than
>"gluons", then the ordinary quarks could be identical to the leptons and
>would not need fractional quantum numbers.  The "baryon quark" could
>also act as a marker to distinguish the sequence of otherwise identical
>quarks, avoiding the need for "colour".
>... 
>Does this idea seem reasonable?  I'd like to know about any theoretical
>or experimental results which might be relevant.
> 
>Jonathan Scott
>jscott@winvmc.vnet.ibm.com

 The two most important experimental inputs for the color quantum number
are the antisymmetric baryon wavefunctions for, e.g. the omega; and the "color
factor" in e+e- --> q \bar{q} which is needed to match the predicted and
measured cross sections. Coupled with recent LEP results * which show that
Abelian couplings are excluded by 5 standard deviations, and you are left
with some very narrow hoops for any new theory to jump through.

*e.g. "Evidence for the Triple-Gluon Vertex from Measurements of the QCD 
Colour Factors in Z Decay into 4 Jets", Decamp, et al (the ALEPH collab),
CERN PPE/92-31, to be published in Physics Letters B.

 ==============================================================================
         Lee Sawyer     | Dept of Physics          
       (SSCVX1::SAWYER) | Univ of Texas - Arlington    
                        | Arlington, TX            
 ==============================================================================
From: platt@watson.ibm.com (Daniel E. Platt)
Newsgroups: sci.physics
Subject: Re: What is not being conserved?
Date: 10 Apr 92 17:47:14 GMT
Organization: IBM T.J. Watson Research Center
Disclaimer: This posting represents the poster's views, not necessarily those of IBM

In article <s4htvINNc7f@agate.berkeley.edu>, aephraim@physics (Aephraim Steinberg) writes:
|> In article <1992Apr9.213832.1911@hellgate.utah.edu> tolman%asylum.utah.edu@cs.utah.edu (Kenneth Tolman) writes:
|> >   In QM there is a probability that a photon will end up "hitting" a
|> >certain spot.  If there is only one photon, and it has a nondetermined
|> >end point, then some quantity is not being conserved.  Consider if I threw
|> >a ball, and then it appeared randomly.  How can there be equal and opposite
|> >reaction unless it is going to a specific place?
|> >
|> >   Obviously I have something wrong.  Does a photon have absolutely zero
|> 
|> No you haven't; it's quite a good question.
|> 
|> >momentum?  I thought that the idea behind solar sailing was to take 
|> >advantage of incredibly small momentums.
|> >
|> >  The other possibility is that it retroactively changes the transmitter.
|> >This seems pretty dubious.
|> 
|> In exactly the same way that a lot of quantum mechanics (viz. EPR) seems
|> pretty dubious.  ``Apocryphal yet true,'' as an old English teacher of
|> mine liked to say.  The simplest example for what you ask is an atom which
|> spontaneously decays, emitting one photon.  The photon is emitted over
|> a broad range of angles, e.g. in a characteristic ``dumbell'' dipole
|> radiation pattern.  The atom recoils, and its momentum is equally un-
|> certain, although the sum of the atomic and optical momenta is equal to
|> zero (in the rest frame of the initial, excited atom).  When a ``collapse''
|> occurs (or doesn't, I don't want to get into metaphysics in front of the
|> readers of this newsgroup any more) what is selected out is a state of
|> the entire atom+photon system, so if the photon is found to have gone off
|> in the +x direction, the atom will be found to have recoiled in the -x
|> direction, conserving momentum.  

Actually, if you calculate the 'in' and 'out' states, and the
transfer matrices, and calculate the cross-sections for various
events, the cross-section for events that violate conservation are
zero...

You have a distribution of possible events in the shape of the
dumbell, but the recoil that is ultimately detected in any one of
those directions depends on the direction the photon was detected
in on an event-by-event basis.


Dan
From: bhoughto@hopi.intel.com (Blair P. Houghton)
Newsgroups: sci.physics
Subject: Re: Xeroxing mirrors
Date: 14 Apr 92 21:32:52 GMT
Organization: Intel Corp, Chandler, AZ

In article <8400009@trsvax> pauls@trsvax.tandy.com writes:
>I tried to Xerox a flat mirror. The paper came out pitch black.

What color is a mirror?

				--Blair
				  "Rabbi 1:  Is it best to answer a
				   question with a question?
				   Rabbi 2:  Is there a better way?"
From: jac@ds8.scri.fsu.edu (Jim Carr)
Newsgroups: sci.physics
Subject: Re: terminal particle energy for accelerators
Date: 15 Apr 92 20:14:17 GMT
Reply-To: jac@ds8.scri.fsu.edu (Jim Carr)
Distribution: world,local
Organization: SCRI, Florida State University

In article <1992Apr15.114716.1@sscvx1.ssc.gov> draper@sscvx1.ssc.gov writes:
>
>I saw an answer posted about bremsstrahlung, which does pertain but isn't
>exactly to the point.    ....     

Mea culpa. 

Proton machines are never really bremsstrahlung limited, but electron 
machines are always limited by radiation.  The mass factor is huge.  
(It has been too long since I did that computation!)  That is why, as 
Draper points out, work on proton machines centers on magnet development 
while electron people are thinking about two linacs pointed at each other 
with novel acceleration technologies used also.  

So if the question is "why can't I do e+ e- and make toponium", the 
answer is bremsstrahlung, but if it is "why is the SSC so big", the 
answer is magnets.  And magnets tend to be limited by material properties, 
if that is your next question! 

--
J. A. Carr                                    |  "The New Frontier of which I  
jac@gw.scri.fsu.edu                           |  speak is not a set of promises
Florida State University  B-186               |  -- it is a set of challenges."
Supercomputer Computations Research Institute |   John F. Kennedy (15 July 60)
Newsgroups: sci.physics
From: siegman@EE.Stanford.EDU (Anthony E. Siegman)
Subject: Re: Question about dimmer switch and lamp.
Organization: Stanford University
Date: Wed, 8 Apr 92 15:51:20 GMT

>> Can someone versed in physics please explain this phenomenon?
>> Given an incandescent lamp with a dimmer switch. The lamp is on.
>> One can then slowly turn the dimmer knob and reduce the light

>The resistance of the filament is very much dependent on its
>temperature.  When the filament is cool the resistance is low
>so that at a given setting of the dimmer most of the energy is

OK.  Agreed, there seems to be a hysteresis in light output vs dimmer
knob setting.

But can anyone say authoritatively, if you slowly ("adiabatically")
vary either the current or the voltage applied to a light bulb
(letting it come to temperature equilibrium at each setting), will
there be a *true hysteresis*, or a true bistable behavior, in the
light versus current, or the light versus voltage curves?  

Or is the hysteresis only in the dimmer-light bulb combination, and
really more in the dimmer's response to a nonlinear load than to any
hysteresis in the light bulb itself?  

(I don't know the answer, but would hazard a guess that there's no
true hysteresis in the bulb itself.)

Organization: Chemistry, Carnegie Mellon, Pittsburgh, PA
Newsgroups: sci.physics
Date: Wed,  8 Apr 1992 05:44:13 -0400 
From: Paul Karol <pk03+@andrew.cmu.edu>
Subject: Def'n of interaction?

Grazie,

Paul J. Karol
from Padova via TELNET

Newsgroups: sci.physics
From: c60a-av@amazon.Berkeley.EDU (Vann)
Subject: Simple Light Question
Organization: University of California, at Berkeley
Distribution: usa
Date: Thu, 9 Apr 1992 08:29:56 GMT

First off, let me disclaim myself as a lowly h7b student, i.e. electromag-
netics.Any response please tone down too pregraduate level, please...

If time dialates and lenghts contract in the reference frame approaching
the speed of light, then what about in the reference frame _of_ _light_?
Is light everywhere at once as lengths contract to zero in the limit and
time dialates until it stops? Would be hard to think the lorentz equations
break down. Is there a way to distinguish between reference frames if light
is everywhere in its own frame? ...

I must be missing something, right? I'm sure this has been rehashed 
innumerable times... once more couldn't hurt, no?
From: sichase@csa2.lbl.gov (SCOTT I CHASE)
Newsgroups: sci.physics
Subject: Re: idealizations??
Date: 16 Apr 92 20:01:45 GMT
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
Distribution: na
Reply-To: sichase@csa2.lbl.gov
NNTP-Posting-Host: 128.3.254.197
News-Software: VAX/VMS VNEWS 1.3-4   

In article <1992Apr15.142013.8494@ms.uky.edu>, bud@ms.uky.edu (William K Glunt) writes...
>In article <1992Apr15.173142.6990@cis.uab.edu> menon@ftp.phy.uab.edu (Govind Menon) writes:
>>
>>There is nothing preventing a perfectly spherical and a perfectly planar 
>>material from being infinitely rigid.  Subject to this condition the bodies
> 
> How fast would such a sphere transmit shock waves in it's interior?
> 

Everyone knows that the finite speed of light sets limit on the rigidity of 
material bodies.  But as long as we're discussion perfectly rigid, perfectly
hard, perfectly smooth bodies, why bring physics into it? 

-Scott


Newsgroups: sci.physics
From: SEMIBRA@YaleVM.YCC.Yale.Edu
Subject: ---OBITUARY---Prof. Feza GURSEY
Organization: Yale University
Date: Tue, 14 Apr 92 01:51:06 EDT

       PROFESSOR FEZA GURSEY       1921-1992
 
  Feza Gursey, retired Joshua Willard Gibbs Professor of Physics from
Yale University; inventor of the Nonlinear Sigma Model, the SU(6) hadron
classification and E6 grand unification; popularizer of quaternion and
octonion algebras in high energy physics; author of more than 100 papers
in high energy physics, general relativity, nuclear physics, solid state
physics and statistical physics; one of the founders of the physics department
of Middle East Technical University in Ankara, Turkey; winner of the
Turkish Scientific And Technical Research Council's Science Award,
Oppenheimer Award, Morrison Award, Einstein Medal, Wigner Medal,
College de France Medal, Istanbul University Medal,
`Commendatore' title of the Republic of Italy; educator; very special person.
He died today (April 13,1992) from the cancer that had been diagnosed last
summer.
From: steinly@topaz.ucsc.edu (Steinn Sigurdsson)
Newsgroups: sci.physics
Subject: Re: Question about dimmer switch and lamp.
Date: 6 Apr 92 16:56:36 GMT
Article-I.D.: topaz.STEINLY.92Apr6175636
Organization: Lick Observatory/UCO
In-reply-to: rrr@hpdmd48.boi.hp.com's message of 2 Apr 92 15:19:31 GMT

In article <1020006@hpdmd48.boi.hp.com> rrr@hpdmd48.boi.hp.com (Rudi Rynders) writes:


    Can someone versed in physics please explain this phenomenon?
    Given an incandescent lamp with a dimmer switch. The lamp is on.
    One can then slowly turn the dimmer knob and reduce the light
    intensity until the filament is just barely glowing.
    If , however the lamp is off, and one slowly turns the dimmer
    switch up, no matter how slow, the light always comes on rather
    suddenly and much brighter than in the reverse process .
    Why is that so ?

No one tackled this one?
I'd say because the filament resistance is a function of temperature,
that should suffice...

|  Steinn Sigurdsson	|I saw two shooting stars last night		|
|  Lick Observatory	|I wished on them but they were only satellites	|
|steinly@helios.ucsc.edu|Is it wrong to wish on space hardware?		|
| "standard disclaimer"	|I wish, I wish, I wish you'd care - B.B. 1983	|
From: sichase@csa2.lbl.gov (SCOTT I CHASE)
Newsgroups: sci.physics
Subject: Re: mass definition in particle physics
Date: 14 Apr 92 19:01:00 GMT
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
Distribution: na
Reply-To: sichase@csa2.lbl.gov
NNTP-Posting-Host: 128.3.254.197
Summary: No theory predicts fermion masses
News-Software: VAX/VMS VNEWS 1.3-4   

In article <1992Apr14.024815.14039@cco.caltech.edu>, brahm@cco.caltech.edu (David E. Brahm) writes...

>Of the Standard Model's 19 free parameters, most are
>related to masses:
>  9 quark and lepton masses (top mass still unknown)
>  4 CKM matrix parameters (3 angles, 1 phase), related to quark masses
>  2 Higgs parameters: vev is known, Higgs mass is unknown
>  3 gauge couplings
>  1 Theta_QCD = 0 but nobody's sure why
> 

Although not strictly part of the Standard Model, we should also add to this
list:
   3 neutrino masses
   3 neutrino mixing angles 

I don't know what name we should give to the Standard Model when you allow 
for neutrino mass.  Probably just "Standard Model" all over again.  But
most people allow for this possibility today.  

-Scott


Xref: sparky sci.physics:6809 sci.skeptic:8136
From: sawyer@sscvx1.ssc.gov (Lee Sawyer)
Newsgroups: sci.physics,sci.skeptic
Subject: Re: Some quotes
Date: 16 Apr 92 15:06:00 GMT
Organization: Superconducting Super Collider Laboratory
News-Software: VAX/VMS VNEWS 1.4-b1

In article <1992Apr16.004905.7468@news.Hawaii.Edu>, vijay@wiliki.eng.hawaii.edu (Vijay writes...
>Here are some of interesting quotes. 
[deletions]
>From John Barrow's book "World within the world" :
>  1st law of thermo. says : you can't win
>  2 nd law of thermo says : you can't break even.
>  zeroeth law says : you can't even get out of the game!
> 

 I have heard varients of this. It has seemed to me that the so-called
third law of thermodynamics, dealing with the unattainability of absolute
zero, is more on the lines of "You can't get out of the game". The "zeroth
law" just says that two systems in thermal equilibrium with a third system
are in thermal equilibrium with each other.

 ==============================================================================
         Lee Sawyer     | Dept of Physics          
       (SSCVX1::SAWYER) | Univ of Texas - Arlington    
                        | Arlington, TX            
 ==============================================================================
Xref: sparky sci.physics:6695 sci.aeronautics:973
From: Bobster@cup.portal.com (Robert Jules Shaughnessy)
Newsgroups: sci.physics,sci.aeronautics
Subject: Need Help Simulating Flight on Computer.
Date: Thu,  9 Apr 92 21:37:23 PDT
Organization: The Portal System (TM)
Distribution: world

           I have always been interested in programming a flight simulator
     and since I have just completed a course in graphics I would like to
     give it a go. I only know the 3D graphics required for such a program
     and I am completely ignorant about the actual flight simulation code.
     Does anyone out there have some idea of what variables I should look
     for? I want to simulate WWI planes as much as possible, so what type
     of data should I get on each plane?



     If someone has some source code that I could plug in the plane data
     too, I would do a backflip! (C code preferred, but I will take any
     thing, or even some BOOKS that would tell me about flight simulation.
     I have hit the libraries, but found nothing worthwhile.)



     Thanks in advance!!!
From: sclera@milori.ccit.arizona.edu
Newsgroups: sci.physics
Subject: Hawking speaks out ...
Summary: UK politics
Date: 8 Apr 92 16:38:10 GMT
Article-I.D.: milori.1992Apr8.093810.1
Reply-To: bob@sclera.physics.arizona.edu
Distribution: world,local
Nntp-Posting-User: sclera


The following caught my eye as something that might be of 
interest to fellow physicists.  Prof. Hawking is talking about 
the political situation in the UK.  

***************************************************************

X-NEWS: uaccit soc.culture.british: 16050
Relay-Version: VMS News - V6.0-3 14/03/90 VAX/VMS V5.4; site arizona.edu
Newsgroups: uk.politics,soc.culture.british
Subject: Re: Simple message
From: wjmc@unix.brighton.ac.uk (-*_Spikey_Tribble_*-)
Date: 6 Apr 92 16:04:47 GMT
Organization: Brighton Polytechnic, UK


 It's obviously too late to affect the result now but did anyone read the
Observer this weekend ? They published a collection of responses to the
questions "Who would you support and why ?" -- the most sensible reply, in
that it simply answered both questions without slinging mud, was that from
Stephen Hawking [ Lucasian Prof. of Mathematics, Camb. ]. For those who may
have missed it :-

> The Conservative governments of the last 13 years have
>
>  1) Made a massive transfer of resources from the poorer sections of
>    society to the better-off by raising VAT and lowering income tax,
>    restricting social security and housing benefits, and by imposing
>    the poll tax.
>
>  2) Seriously weakened local democratic control and greatly increased
>    the power of central government by measures such as abolition of the
>    GLC and the metropolitan counties, removal of business rates from
>    local control and collection, rate and poll tax capping, encouraging
>    schools to opt out and the imposition of a national curriculam. There
>    would have been howls of Big Brother if Labour had done that.
>
>  3) Badly underfunded education and science. The Conservatives have
>    behaved with arrogance and disregard for public opinion on matters
>    like the poll tax and reform of the NHS, confident that they would
>    be re-elected whatever they did. If they were to get back this
>    election, they would feel they were indeed invincible. It is time
>    for a change, and Labour is the only serious alternative, at least
>    until the voting system is changed.

 Hawking has one of the greatest minds in today's world -- his words
should at least be given consideration.

.
-- 
###########################################################################
#  Bill Crawford  aka  *Cuddly_Cactus*     |     wjmc@uk.ac.bton.unix     #
#  BSc (Hons) Computer Science Year One    |     wjmc@uk.ac.bton.vms      #
#  Any views I express are not necessarily those of Brighton Polytechnic  #
###########################################################################

*******************************************************************

The Einstein/Sakharov/Li-Zhi tradition is apparently alive and
well.  Something about cosmology, I guess :)

C.S. Cornuelle
bob@sclera.physics.arizona.edu