Subject: FORCE ON A WIRE IN A SATURATING MAGNETIC FLUID
From: lbliao@alumnae.caltech.edu (lbliao)
Date: 11 Dec 1996 19:52:08 GMT
I am interested in finding out any papers, books, theses, treatises on the
force on a wire immersed in a saturated magnetic fluid. The force on a wire
is BIL. However, due to the cumulative effect of H's from the wire on the
magnetic dipoles on the saturating magnetic material, the orientation of the
dipoles will be influenced by the H of the wire considerably so that the
force on the wire will not be B_{sat}IL. I have done a first order analysis
and the result is simple, but not enlightening. I believe that work on this
has been done long ago by teams of industrial labs, since this problem has
relevance to the calculation of forces in all kinds of electrical machines.
Specifically, the force may depend upon the diameter of the wire, or the
size of the void containing the bundle of thin wires. The term fluid is used
only to suggest that the situation is isotropic, and that the wire can be
visualised to move through it.
Please contact via email, and you can send TeX, LateX or PostScript files
if necessary to convey the idea.
Thanks a lot!
lbliao
Subject: FORCE ON A WIRE IN A SATURATING MAGNETIC FLUID
From: lbliao@alumnae.caltech.edu (lbliao)
Date: 11 Dec 1996 19:52:20 GMT
I am interested in finding out any papers, books, theses, treatises on the
force on a wire immersed in a saturated magnetic fluid. The force on a wire
is BIL. However, due to the cumulative effect of H's from the wire on the
magnetic dipoles on the saturating magnetic material, the orientation of the
dipoles will be influenced by the H of the wire considerably so that the
force on the wire will not be B_{sat}IL. I have done a first order analysis
and the result is simple, but not enlightening. I believe that work on this
has been done long ago by teams of industrial labs, since this problem has
relevance to the calculation of forces in all kinds of electrical machines.
Specifically, the force may depend upon the diameter of the wire, or the
size of the void containing the bundle of thin wires. The term fluid is used
only to suggest that the situation is isotropic, and that the wire can be
visualised to move through it.
Please contact via email, and you can send TeX, LateX or PostScript files
if necessary to convey the idea.
Thanks a lot!
lbliao
Subject: Re: faster than light travel
From: "Cisco"
Date: 11 Dec 1996 19:59:18 GMT
Hi
I am quoting from the other post on this subject.
Hi
I have been interested in paradox of time travel and Find it of interest to
share a few thoughts.
Concept of time travel involves a particular interesting phenomena, if you
go to past and alter it so much that this present never takes place, then
will it ever actually happen. Second if you know the future of acts you are
doing you may alter the acts and this future may never happen.
Going by the paradigm of existence, the only possibilities here are that
you can see what happened in past and particle or person can travel to
future. The reverse being not true.
Now considering the fact that in four dimension time-space continuum, time
is a vector quantity and hence moving in both direction should be possible.
What is factor which prohibits us to move mass in reverse direction???
Considering the above problem I came across to possible answers.
1. Explanation by way method to execute :-
The possible method for changing the time continuum is to change the rate
of moving along the time axis. The possibilities are if you move at or near
the speed of light, the faster you move slower the time will pass and that
way you will land into future. At speed of light entirety will flash pass
you, without time even changing in your time frame.
But this way we do not explain if we can move faster than speed of light
and what will happen than.
2. Time for any frame of reference:-
The way we refer any frame of reference is its age. Considering any origin
we can define, we can assign age to all possible existences. Now age is not
a vector quantity, being a scalar you can keep accumulating age slower or
faster, but never negative. So any mass or energy can increase or
accumulate more of this age.
This is equivalent to ENTROPY in Thermal Physics where net entropy can
stay constant or increase but never decrease.
From the above analysis basically I conclude that
"Starting any point in reference, mass and energy can only age. Based on
rate of ageing they appear to refer to past present or future. You can
observe light or mass emanating from past events to appear in present, but
these particles have dissociating themselves from past. Similarly you cause
mass or energy to dissociate from present which will appear in future."
I will appreciate any feedback to pratap_singh@hotmail.com
CCD Data Acquisition wrote in article
<32AC5F38.148@space.mit.edu>...
> Cisco wrote:
> >
> > What if motion is in circle so as you keep travelling very fast but
> > visiting the
> > same point more than once.
>
> You still haven't traveled a distance cT. However my notion is still
> naive and probably invaild but I was trying to make the point that one
> may be able to travel back in time but not interact wit the past.
>
Subject: Re: Creation VS Evolution
From: nrezmerski@che2.che.umn.edu (N. Rezmerski)
Date: Wed, 11 Dec 1996 22:07:36 GMT
owl@rci.rutgers.edu (Michael Huemer) issued forth:
>>Minnie (mhlynn@geocities.com) wrote:
>>
>>: [grin] Don't be so judgemental, man. They do have a clue, at least in
>>: the Flood part. Haven't you noticed that every culture in the world has
>>: an ancient story of great flooding?
>I don't know about the "every culture" part, but many of the Biblical
>myths are copied from earlier Mesopotamian mythology.
Yeah, I don't know why the creationists keep citing this claim
as evidence for the flood. Logically, if the flood killed everyone
but Noah and his family, friends, attorneys, pets, etc., then
everyone who is alive today must be descended from them.
That means no matter where they live in the world, their flood
story must have been brought there by someone descended
from Noah et al, and they were all in one place during the flood!
>--
> ^-----^
> Michael Huemer / O O \
> http://www.rci.rutgers.edu/~owl | V |
> \ /
- Nick@Nite / Nicholas J. Rezmerski
rezm0001@gold.tc.umn.edu - University of Minnesota
"I don't want to live on in my work; I want to
live on in my apartment." - Woody Allen
Subject: Re: Time travel? What about Deja Vu's?
From: Rooster
Date: Wed, 11 Dec 1996 15:28:28 -0800
Terry Smith wrote:
>
> > From: Kris Schumacher
>
> > which is itself a physical section of our brain. All the
> chemical
> > things that scientists are often recording about the brain
> seem to
> > be more likely effects than causes. Is there any evidence to
> say
> > why they are the cause of anything? I think that they are
> effects
>
> A reaonable point, as in `correlation is not causation', but
> when the proposed effect of the variation in a neurotransmitter
> _is_ produced by varying the production of it, causation is the
> appropriate model. Still, a simple mechanistic view of
> awareness, while useful for formulating treatments for
> pathological distress, doesn't come close to addressing the
> foundation of `self-awareness' IMO.
>
> If our intellects were merely an physiological adaption for
> survival, what possible purpose would the effort spent engaging
> with the likes of Karl, Zeiler and Curley serve?
>
> Terry
Time Travel, well since time is a mortal reference,we can take the
liberty to change the rules , we made them. I guess we could call
daylight savings time " Time Travel"...but as far as Deja Vu' is
considered , Ive allways felt that its simply perhaps a moment when we
use than 1/2 percent extra of that otherwise wasted gray matter we call
our brain . But I tend to oversimplify alot of things
Subject: Re: Closed fluid filled pipe+heat = boom..always?
From: "James W. Kronberg"
Date: Tue, 10 Dec 1996 10:07:12 -0400
It sounds as if you're trying to build a high-temperature heat pipe.
This is a reasonably mature technology, but I don't recall ever seeing
any mention of one which would work over the whole range from room
temperature up to 1800 F (982 C). If this is really what you need,
simple convection is likely more appropriate.
Provided that there's enough empty headspace for expansion, the pressure
developed by a given fluid at temperature will be its vapor pressure
plus the pressure of any extraneous gases present. The boiling point of
a fluid is just the temperature at which its vapor pressure equals
atmospheric; this is why in the high Rockies it takes much more than 3
minutes to soft-boil an egg!
Vapor pressure goes up with temperature roughly as an exponential
function. Any good handbook of physical constants, such as the CRC
Handbook of Chemistry and Physics, tabulates vapor pressures for a wide
variety of organic and inorganic liquids
If you want your fluid to be (mostly) a liquid over the whole range,
you'll need to pick a substance with a melting point below your minimum
expected working temperature, and a vapor pressure at your highest
anticipated temperature which won't explode your tube. The material
also needs to be stable over the working range, and needs not to
dissolve the tube material.
As a first cut, I'd suggest you look into fusible metal alloys such as
indium-gallium-bismuth-tin. These metals all have low melting points,
high boiling points (= low vapor pressures) and are low in toxicity.
I'd expect a reasonably thin-walled stainless-steel tube would contain
these pretty well, as long as the tin content didn't go too high. Pure,
molten tin is a surprisingly good solvent for other metals! Failing
that, try alumina ceramic.
Good luck!
----------------------------------------------------------------
"Reality is a sandwich I didn't order." -- Karen Papouchado
----------------------------------------------------------------
(All the usual legal disclaimers go HERE.)
Subject: Re: freedom of privacy & thoughts
From: caesar@strauss.udel.edu (Johnny Chien-Min Yu)
Date: 11 Dec 1996 16:31:10 -0500
Why Mind Control Is Also Lives Control?
(Part Six)
"What are the most popular man-made Heart Diseases which are
induced by the mind control operators?"
To induce "heart attack" and "heart disease" are the most popularly used
tactics by mind control operators.
What are the "heart problems" that can be induced by
the mind control operators?
Now, I would like to clarify it to readers who might also concern it.
The popular man-made "heart-diseases" in mind control operators
are the weakened heart ( by using the microwaves to constantly sppeed
up), the broken veins of heart ( caused by using the chronal gun to
penetrate the chest frequently), heart pain (caused by low radio
waves, or acoustic bullets ),etc. Sometime, the operators will use
the low radio wave suddenly attack victim's heart for a while, if a
victim already has the heart disease (from birth or caused by
man-made) then the victim could also be killed as if natural death
in the suddenly attack with remotely controlled low radio waves.
(attachment)-New World Order & ELF Psychotronic Tyranny by C.B. Baker
===========================================
Several U.S. high tech laboratories, with the help of Soviet scientist,
are working on very low frequency (VLF) weapons. NEXUS reported that
these U.S. high labs, including Col. Alexander Los Alamos Laboratory,
are working on "developing high power, VERY LOW FREQUENCY acoustic beam
weapons. They are also looking into methods of projecting high frequency
acoustic bullets."
"Very Low Frequency (VLF) sound, or low-frequency radio-frequency
modulation CAN CAUSE NAUSEA, VOMITING, AND ABDOMINAL PAINS. Some Very Low
Frequency sound generators, in certain frequency ranges, CAN CAUSE
DISRUPTION OF HUMAN ORGANS, and at high power levels
CAN CRUMBLE MASONARY." Such a system could also be used to create
artificial earthquakes.
NEWSWEEK described how these psychotronics non-lethal weapons will be
used: "The United States needs new options to control rogue governments
and insurrectionaries without resorting to total war. New-wave military
thinkers say that the list of exotic technologies that could be harnessed
for non-lethal technologies is already large and growing. It includes
lasers, MICROWAVES, SOUND WAVES, STROBE LIGHTS (already used for
psychotronic entrainment during the Waco siege), ELECTROMAGNETIC PULSES
and Microbes (GERM WARFARE)."
In March, 1993, the National Institute of Justice [NIJ]--(an office of
Janet Reno's Justice Department), issued a report titled: "NIJ Initiative
On Less-Than-Lethal Weapons." The Department is now encouraging local
and state police organizations to utilize Soviet-KGB psychotronic,
electromagnetic and mind control weapons against their local citizenry.
Targets for these KGB weapons include "domestic disturbances" meaning
that mind-control devices are even to be utilized against family
arguments.
The reports stated: "Short-term research will be completed TO ADOPT
MILITARY TECHNOLOGIES TO USE BY DOMESTIC LAW ENFORCEMENT...including
LASER, MICROWAVE, AND ELECTROMAGNETIC" WEAPONS.
===========================================
What is the difference between using the microwave weapon or
using the chronal gun ( or using the low radiofrequency wave?
By using the designed microwaves radiation, it can speed the victim's
heart and reduce the heart function of a healthy person.
However, unless some people migh have the naturally weak heart
already, such kind of heart disease inducing will take a period of
time to kill a victim.
The mind control operators will use the chronal gun (similar as air
pressure bullets) to break a victim's veins of heart in few minutes.
That's because the chronal gun bullets has very strong penetrated
ability (can even penetrate thick metal ). Therefore, the chronal
gun can be used on high set and its' bullets can break a victim's veins
of heart in a few minutes. On the other hand, the chronal
gun bullets can be also used on low set, if the operators use it to
manipulate people's lives.
Why?
While it is used on low set, the chronal gun bullets can still
quickly penetrate people's body to cause injury but without pain.
The operators will use it to manipulate people's lives in order to avoid
victims' knowledge.
So chronal gun can be used to cause the heart veins broken in one day
by constantly shooting the chronal gun bvullets on victims' hearts.
However, such kinds of injurires will cause obvious pain on victims.
Therefore, if it is not for the reason which is to quickly mudder or
assassinate a special target(such as political person), the operators
will not use it (chronal gun) on high set.
Thus, this kind weapon usualy be used on low set in oder to manipulate
people's lives (to induce heart disease, kidney disease, or liver
disease to the victims) without victims' knowledge.
The mind machine operators would suddenly use the low radio frequency
wave to attack a victim's heart for a while. Such kinds of attack can
kill a person if the victim doesn't have a healthy heart. However, it
also can kill a healthy person if one don't know how to protect oneself.
However, by using the power beaming system patent, the operators can
use the electromagnetic wave to remotely power the emitters of
radio wave in car or on the light poles to attack people's hearts.
So the low radio wave usually be used on outside building (such as
outside of shoppinf center, wild field) or inside the car
to attack a people's heart in order to kill peoples (victims) as if
natural death.
However, this kinds of attack will be easily known by victims
because it will cause the painful feeling or high pressureue on victims'
heart. I have such kinds of injured experiences in the ban, car and
outside of shopping center for several times (Fortunately, I know how to
protect myself, so I can tell the truth and facts to our readers.
The chronal gun usually be used to break the vines of heart or the
function of liver in a short time. However, it will cause bee
sting feeling in such kinds of situation.
The designed microwaves radiation usually be used to reduce people's
heart functions. However, it won't give the victim the painful
feeling before it induce the "heart disease" or "hear attack".
However, by using the microwave radiation to speed people's heart, it
will be obviously known by the victims.
If people do not know how to protect themselves from being injured while
their hearts are attacked with the microwave radiation. It will be the
most terrible experiences and can never be forgotten by the victims.
That's because the victims will obviously know that while they are
sleeping, the operators will remotely use the microwave radiation to
induce the heart disease on them.
However, in current mind control society (since the local law
enforcement are the basic unit of mind control), these people (victims)
can do nothing to protect themselves except they learned the knowledge to
protect themselves by their own.
Dear Readers,
To protect your lives and your rights, you must learn the mind
control technologies before these operators's illegal activities can
be regulated by our Congress or President.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Alan Yu
The first objective of mind control organization is to manipulate
people's lives in order to eliminate their opponents or enemies
secretly (die as if natural cause).
The mind (machine) control system is the national security system of
Taiwan from late of 1970s and should be the same in US or lots free
countries (In Taiwan, the mind machine is translated as "Psychological
Language Machine." In the Mandarin sounds as "Sin_Lee_Yue_Yan_Gi")
Accusing other as insane without evidence is the "trademark" of mind
control organization.
(If any law enforcement officer declare anyone as "insane" and
the social security department do not put these individual in the
welfare program as diable person, then it only represent a kind of
political suppression or false accusation to discredit someone.
That' because the local law enforcement is the basic unit of mind
control)
The shorter the lie is, the better it is. So, the liar can avoid
inconsistency and mistakes that other people can catch.
Only the truth will triumph over deception and last forever.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Subject: Re: What is the Cause of Time Dilation?
From: 100130.3306@compuserve.com (Eric Baird)
Date: Wed, 11 Dec 1996 21:23:18 GMT
On Thu, 31 Oct 1996 14:24:10 -0500, "Robert. Fung"
wrote:
>Richard Mentock wrote:
> > Fascinating stuff. What are we talking about? "an object appears
> > smaller in a photograph if the object is further away from the camera."
> > Do you mean that of two identical objects, the one that is farthest from
> > the camera will have the smallest extent on the photo? What kind of
> > objections did the physicist raise to that?
> >
> > I've never heard of the receding/approaching effect either. How does
> > that work, using your "signal timelags" explanation.?
> >
> One book that discusses the various ways of deriving the Lorentz
> transforms is called Spacetime and Electromagnetism; two authors
> one a physicist and one a philosopher.
> There are many ways apparently to look at the transforms and derive them,
> and this is not surprising to me since they are largely trigonometric
> relationships
> (the factor sqrt(1-sin(theta)^2) appears throughout the trig identities
> and relativity just happens to use sin(theta)=v/c for u.)
> The Doppler effect is derivable from the trig identities like
> tan theta = sin(theta) / sqrt(1-sin(theta)^2) etc.)
> and this simplicity in relations makes it all too easy for them
> to overlap into other effects and be interpreted in many ways.
Yup. There seem to be lots of ways of using "wrong" theories to
generate "right" results.
> Having said this, to procede to attempt to answer the question,
> if the length contraction is derivable, explainable,
> in terms of the Doppler effect [1],
> as is one of the derivations of the Lorentz transforms,
> (in this derivation all matter is bound by EM fields,
> hence anything contracting the EM field also contracts the bonds
> resulting in a length dilation) then
> one would guess it appropriate also to map every EM effect over into
> its affect on matter.
> Your question seems to be: "is there a transverse length dilation ?"
> And using the above argument,
...
Well, this is the first time I've tried working through this
particular exercise, but if you are next to a moving train, and one
half is receding at v, and the other half is approaching at v, then if
you assume that the SR idea that light-propagation is at fixed speed
relative to the observer is correct, then you get an observed
length-change (before you take into account the Lorentz effect) of:
l'/l = 0.5c/(c+v) + 0.5c/(c-v)
l'/l = 0.5c * c(c+v+c-v)/[ (c+v)(c-v) ]
l'/l = c^2/(c^2 - v^2)
l'/l = 1/(1 - v^2/c^2)
, which is a Lorentz-squared length-dilation
Divide by the Lorentz factor (to introduce an SR length-contraction),
and the net result is /still/ a length-dilation. Wierd.
> ... I would only imagine that such a dilation
> could come about in terms of the amplitude and direction of the
> EM field (E and B).
Not sure about the amplitude. If you have a standing wave between two
mirrors, and the distance between the mirrors changes, then so does
the wavelength of the wave.
Again, the supposed frequency-change of an unobserved captive wave
within an object seems to be inversely proportional to the
frequency-change of a wave that's released. So a signal from an
approaching object appears blueshifted, but you'd have to treat the
wavelength of a wave trapped within the object as being redshifted,
because of the length-increase?
Yessss!
That would give you a mass-loss in approaching matter inversely
proportional to the energy-increase in its emitted radiation.
The (SR) object approaching at lightspeed appears to have zero mass,
because it's internal wavelength appears infinite (mass-energy
equivalence), and its emitted signal appears to have infinite
frequency, which again corresponds to the apparent reduction of its
inertial mass to zero.
= Doppler Mass Shift !
Hadn't tried this particular DMS exercise before (wavelength-change of
captive light). Must scuttle off and write a new DMS page for my
website on it ... :-)
> It should be periodic in amplitude, increasing with source velocity, and its
> direction would depend upon the polarization of the EM field.
> It is also to be stated, being well known, that there are no perfect sources,
> and the polarization may change over time.
>
> But defining "length" in terms of the amplitude of a wave is somewhat different
> than defining "length" in terms of the wavelength of a wave. The above argument
> poses that the spacial bonds depend on the EM wave's wavelength. I'm not sure
> one can view the spacial bonds between matter in terms of the wave's amplitude ?
> [1] See Richard Stirniman's comments on Liu's paper:
> http://www.padrak.com/ine/RS_REF3.html
Will take a look.
-
=Erk=
___________________________________________________
Doppler Mass Shift:
http://ourworld.compuserve.com/homepages/eric_baird/dms_cont.htm
___________________________________________________
Subject: Re: What is the Cause of Time Dilation?
From: 100130.3306@compuserve.com (Eric Baird)
Date: Wed, 11 Dec 1996 21:24:01 GMT
On Thu, 28 Nov 1996 18:52:56 GMT, jeffocal@mail.idt.net (Jeffrey
O'Callaghan) wrote:
>This is a cross posting of an article on the subject of time dilation
>that appeared in the Cause of Gravity thread in the
>sci.physics.new-theories group. It explains one possible cause for
>time dilation.
>>Lou Verdon (lverdon@julian.uwo.ca) wrote:
>>
>>: But if we consider a traveller who leaves us at the speed of light
>>: and returns 10 minutes later, all the time travelling at the
>>: speed of light, then we have two real points in time that the
>>: traveller actually exists in real time at the same instant.
>>
>This may be the basis for Einstein concept of time dilation. I hope
>that it helps to answer your question.
>Is it possible that what we perceive a time dilation is a three
>dimensional translation of the four dimensional space+time universe.
>For the sake of this discussion assume that all energy in our universe
>is a result of a curvature in three dimensional space with respect to
>the fourth. Therefore the greater the energy difference between two
>objects moving relative to each other the greater the curvature. We
>as three dimensional beings can only perceive the three dimensional
>component of this fourth dimensional curvature. Therefore we would
>measure the distance that an objects travels as the linear end points
>of this arc in fourth dimensional space. This means that for each
>observer in relative motion would view the distance that they had
>traveled relative to each other as less than the actually distance
>traveled. This would also result in both observers perceiving that
>that their length had contracted in the direction of the motion
>because the length of the end points of the are shorter than the arc.
>Each observer in relative motion would view the other clocks as
>dilated or running slower because they can only view the linear
>translation of the time it took to complete the arc in fourth
>dimensional space.
>Jeff
>IMAGINATION ILLUMINATES REALITY Links to the Future
> http://www2.pcix.com/~jeffocal/shadlink.htm
> The Virtual Reader for the vision impaired
> http://shell.idt.net/~jeffocal/frank.htm
That's a nice way of putting it.
If spacetime is curved by relative motion, and SR assumes that no such
curvature exists, and instead insists on extrapolating distances and
times according to a straight-line tangent to the curve as it
intersects the observer, then you'd expect there to be some
"error-factor" variable that would tell you by how far your linear
extrapolation missed the "true" position.
That appears to be the role of the Lorentz equation.
-
Also, if space were really curved, then you'd expect another sort of
amendment to be necessary when multiple observers were involved,
because otherwise those multiple observers could compare notes and
extract evidence of curvature from the mismatches in their data.
This second correction appears to be dealt with by the
velocity-addition formula.
-
Myself, I prefer to visualise shifts as being propagation shifts in a
space that's distorted by relative motion, and to think of Lorentz
shift as being an averaged "curvature factor" that's deliberately
calculated as an average so as to remove the effects of observed
mass-reduction/dilation in front of and behind the object, and leave
you with an residual angle-independent observed redshift figure that
can then be superimposed on top of a simple "flat-space" propagation
shift to give you results that agree with the curved-space
predictions, =provided= that you only use the method for fully
closed-path calculations.
-
Lorentz and Einstein both seem to have recognised that their theories
needed to be able to dismiss open-path observations as off-limits, and
Minkowski later obliged by deciding to make single frame-transition
shifts have an arbitrary "imaginary" component.
-
Methinks that (with SR) we are talking about a cleverly-constructed
flatspace approximation of what are actually curvature effects.
-
___________________________________________________
Erk's Relativity Pages:
web: http://ourworld.compuserve.com/homepages/eric_baird/
___________________________________________________
Subject: Re: Can you work it out!
From: fschulle@alma.student.uni-kl.de (Frederic P. Schuller)
Date: Wed, 11 Dec 1996 22:04:06 GMT
lrmead@ocean.st.usm.edu (Lawrence R. Mead) wrote:
>qi bao (q-bao@nimr.mrc.ac.uk) wrote:
>: A fly, travelling at 5 mph, hits a train travel at 80 mph in the
>: opposit direction. The fly, a little flatter, changes direction. To
>: change direction it has
>: to have gone from 5 to 0 to 80 mph. If the fly was, at one point, 0 mph,
>: and it was stuck to the train, when was the train a zero mph.
>:
>: Any comments!
>Um, yes. Relative to the *ground* the train only slowed a tad (conservation
>of momentum) - its velocity was never zero, nor was the flies.
Your answer is right in the theory of rigid bodies. But in reality
there is not such a thing as a jump of quantities (at least if no
quantum behaviour is involved, what shouldn't be the case) - all
changes in distance, velocity and acceleration must be "smooth".
The train - and especially the fly - are not rigid bodies. Thus you
are right that the train never was at zero speed (conservation of
momentum) but the center of mass of the fly was because it had enough
time to be accelerated during the deformation.
The seeming paradoxon is that something stuck to something else
should have the same speed, but in this case it obviously cannot.
Solution: the distance of the center of mass to the surface of the
train is not constant after the contact - as a result the expression
"stuck to" is not equivalent to "having the same speed" in the real
world.
Hope I am right.
FPS
>--
>Lawrence R. Mead (lrmead@whale.st.usm.edu)
>ESCHEW OBFUSCATION ! ESPOUSE ELUCIDATION !
>http://www-dept.usm.edu/~scitech/phy/mead.html
Subject: Re: Low Cost DATA AQUISITION system using your PC
From: Kent Nickerson
Date: Wed, 11 Dec 1996 13:35:40 -0500
Robert Klein wrote:
>
> A low cost data acquisition system is available which plugs directly into
> the serial port of your PC to measure such parameters as temperature, pH,
> pressure, strain, level, flow rate, light intensity, and viscosity. Unit
> has 8 independent channels for simultaneous monitoring and recording.
> Data can be displayed in either tabular or graphic format. Monitor comes
> complete with software program for DOS or Windows. For further details
> contact Lazar Research Labs., Inc. at service@lazarlab.com or by fax at
> 1-213-931-1434 or in the U.S. at 1-800-824-2066. Or see the Lazar web
> site at http://www.lazarlab.com
I dislike commerical ads, but being interested in a logger, I checked
this one out.
They will sell a 5 ft. serial cable for $29. This bodes ill for the
rest of their pricing structure.
Kent
Subject: Re: What is the Cause of Time Dilation?
From: 100130.3306@compuserve.com (Eric Baird)
Date: Wed, 11 Dec 1996 21:23:35 GMT
On Sat, 30 Nov 1996 20:08:20 +0000 (GMT), Cees Roos
wrote:
>In article <329F2A23.6B17@ix.netcom.com>,
>wrote:
>>
>> Cees Roos wrote:
>[snip]
>> > The idea that a model is backwards or not is metaphysics, not physics.
>> > In physics the two are equivalent.
>>
>> Then why is one chosen over the other? I suppose your claim that
>> the geocentric vs. heliocentric models are accepted simply due to
>> convenience?
>You suppose right.
>> The world could also said to be "flat" if you simply
>> allude to a convenient model.
>No. Non equivalent theories.
Could be equivalent, with a suitable choice of coordinate systems and
enough additional observercentric "effects".
Explain deviations of lightbeams away from the surface by saying that
matter repels light according to its distance from the observer, use
this effect as the basis of thermodynamics, stellar radiation, the big
bang ...
Stupid? Yes.
But if it's possible to map between a flat-Earth and a curved-earth,
then it must be, in principle, possible for a theory to map the
physics too, as long as the theory was observercentric. You'd end up
with a fairly lunatic theory, but it would work, within limits.
If the flat-earthers had gained ascendency, and their model was
accurate enough, then after a few generations of physicists has gone
though the system every effect that we would consider to be evidence
of a "curved" earth could be taken by them to instead be proof of the
mathematical consequences of a "flat" one, coupled with relativity
theory.
Claim that the earth was round without having any "new" data to
support your claim, and you'd fall foul of the crackpot index.
I don't, for an instant believe the above flat-earth theory. It's an
extreme example of how a dumb idea can be made to work with enough
advanced mathematics.
I would, however, suggest that =perhaps= the SR guys are doing
something almost as odd with their flat-space theory. Their model
seems to have the basic attributes of a curved-space model, and yet
its success is quoted as evidence that such curvature does not exist.
Disturbing.
-
___________________________________________________
Erk's Relativity Pages:
web: http://ourworld.compuserve.com/homepages/eric_baird/
___________________________________________________
Subject: Re: Propellant Free Space Drive
From: Joe@stellar.demon.co.uk (Joseph Michael)
Date: Wed, 11 Dec 96 21:59:46 GMT
In article <58k7ln$150@kira.cc.uakron.edu>
david8@dax.cc.uakron.edu "David L. Burkhead" writes:
Thanks for this long winded spoof.. But what you have said is
a mistaken on at least one count and says what I
I say but fail to quote the solution included in the same sentence.
There are diagrams, and there are references to diagrams,
so please read what is ther IN ITS ENTIRETY before wasting
so much of your time...
>Okay, let's go over this.
Alright!.. :-)
>First, the "apparatus" consists of two electromagnets separated by a
>non-magnetic material (first, that's a misnomer since all matter is
>made up of charged particles and is affected at some level by magnetic
>fields--second, as we will see shortly, that's less of a factor than
>one would at first assume).
In other words, you could have ignored it?
Jeez.. what a way to nit pick!
>Now, an electromagnet is, at heart, a bunch of nearly closed loops
>(generally coils of wire) through which a current can be passed.
The first and a most fundamental mistake. In your diary an electromagnet
is a bunch of closed loop coils of wire because that is all you imagined
them to be. Let me tell you, as you should have known from ALL THE DIAGRAMS
which you say you have reviewed twice now, that there is not a single coil
there of such a description. What? How? When? Where?
Well look at it again! http://www.stellar.demon.co.uk/stellar.htm
The coils talked about there are single ring multi-segmented photocells.
That is not the same as the coil you describe - which will NOT correctly
work according this complete wasted analysis you gave and which I
happen to know very well thanks...!
Let me also warn you here, this device is not about
the properties of switched coils - it is about the properties
of a multi-segmented photocell semiconductor with a step work function
fabricated into a ring device and illuminated by ultra fast laser pulses.
Because of the step work function, the system is non-linear and
Maxwell's equations have NO solutions. But, simple assumptions
can be made about piecewise linearity and the solutions described
in the web page is based around that working assumption.
So you really did waste a lot of time describing all of this following..
>The
>moving charges form a magnetic field. So far so good. This gives you
>a field whose strength and polarity can be controlled by changing the
>current in the loops. However, a coil of that nature has another
>property--inductance (actually, it's a consequence of that magnetic
>field). This means that it resists changes in the current. To
>increase the current in the coil you have to spend energy. Energy is
>given up in decreasing it. And the faster you try to change that
>current, the higher the voltages involved in producing the change.
[snip.. wasted remainder deleted]
While you are correct in saying this about standard coils, it
is completely off the subject as the discussion in a semiconducting
photocell has to invoke
electron hole pairs, charge separation, work function, carrier lifetime etc.
In very brief half lay terms I'll try to explain..
Semiconductor photocells illuminated by laser pulse have no rise time
as such. When a photon that has exceeded the work function of the material
hits the semiconductor, it releases an electron hole pair to drift in
the already present space charge of the PN junction. It does not matter
if one pair or a million or a billion pairs are created - there is no
concept of a rise time in this quantum world! The charge carriers simply
come into existence throughout the material and drift in the space
charge of the PN junction. This is a non-linearity and if you tried
to apply Maxwell, you will get infinities in dI/dt and dQ/dt terms.
The carriers have a lifetime before the electron hole pairs re-combine.
There is a constant using up of the electron hole pairs such that
with a given lifetime, if the light source is removed, then most of the pairs
will eventually anhiliate and settle back down to the normal background
state. When the light source is removed, this anhiliation process
can remove charge at a very high rate throughout the semiconducting
material as the whole material turns insulator. Once again Maxwell
breaks down as dQ/dt and dI/dt are not commensurate with normal
conducting material properties.
Most semiconductors and non-linear materials are similarly weak
in the application of Maxwell's 'laws' under many conditions.
Magnetic pulses created routinely in lab experiments are 4-12 picosecond
for GaAs without the usual concept of a rise time. So you see, I'm
not calling for something that is unknown.. Simply - for somebody in NASA
or someone with a GaAs photocell facility to test this theory before
spending billions reaching for Mars on propellant only rockets.
At most it would cost someone a few hundred dollars if they have the
facilities already and $50,000 if they don't.
*-------------------| http://www.stellar.demon.co.uk |-------------------*
| Joseph Michael * Robodyne Cybernetics Ltd |
| Joe@stellar.demon.co.uk | 23 Portland Rise, London N4 2PT |
| Tel 0836 703945 (Mobile) : Tel 0181-800 9914 Fax 9915 |
*-----: MIRROR -> http://easyweb.easynet.co.uk/~robodyne/stellar :-----*
Subject: Une Question sur la Piezoelectricite
From: Laurent LE GUILLOU
Date: Thu, 12 Dec 1996 00:32:21 +0100
Bonjour,
Un physicien peut-il me venir en aide ?
Je cherche a mettre en evidence experimentalement les effets
piezoelectrique direct et inverse, et je me pose beaucoup
de questions d'ordre pratique.
- Pour l'effet direct, comment faire concretement ?
Avec quel genre de materiel appliquer une contrainte importante
sur le cristal, avec quel dispositif ? un gros levier auquel on
accrocherait un poids, comme ca ... ?
|\
Force | \ Levier
| \
V \
P |\
| \
| |\
| | \
|_| \
____v__ \
|cristal| o
Et comment mesurer la polarisation qui apparait ?
- Pour l'effet piezo inverse, comment mesurer la deformation du
cristal ? il s'agit d'un effet de l'ordre d'une dizaine de microns
a tout casser : (a moins que je ne me trompe...)
En effet,
e = d E
ij ijk k
avec d (module piezo) de l'ordre de 10^-11 a 10^-10,
E (champ applique) de l'ordre de 100V/mm soit 10^5 V/m,
donc la deformation e a mesurer est de l'ordre de 10^-6 a 10^-5 m,
ce qui est plutot petit... j'envisage bien la possibilite de
mettre en evidence cette deformation avec des methodes optiques
(interferometrie), mais c'est plutot lourd en materiel... et le
resultat me semble bien incertain (longueur d'onde du visible 0.4
a 0.8 micron ; si la deformation est un peut trop faible (ordre
du micron), ca risque d'etre tres dur...)
Si l'un de vous peut me venir en aide en me donnant quelques
suggestions pour mener a bien ces experiences, je lui en serais
tres reconnaissant...
Laurent LE GUILLOU
Etudiant en Licence de Physique
Universite du Maine, France
llg@lola.univ-lemans.fr
Subject: Re: faster than light travel
From: StarDust_Babe
Date: Wed, 11 Dec 1996 11:01:26 +1000
Cisco wrote:
>
> Hi
>
> I am quoting from the other post on this subject.
>
> Hi
> I have been interested in paradox of time travel and Find it of interest to
> share a few thoughts.
>
> Concept of time travel involves a particular interesting phenomena, if you
> go to past and alter it so much that this present never takes place, then
> will it ever actually happen. Second if you know the future of acts you are
> doing you may alter the acts and this future may never happen.
>
> Going by the paradigm of existence, the only possibilities here are that
> you can see what happened in past and particle or person can travel to
> future. The reverse being not true.
>
> Now considering the fact that in four dimension time-space continuum, time
> is a vector quantity and hence moving in both direction should be possible.
>
> What is factor which prohibits us to move mass in reverse direction???
>
> Considering the above problem I came across to possible answers.
>
> 1. Explanation by way method to execute :-
>
> The possible method for changing the time continuum is to change the rate
> of moving along the time axis. The possibilities are if you move at or near
> the speed of light, the faster you move slower the time will pass and that
> way you will land into future. At speed of light entirety will flash pass
> you, without time even changing in your time frame.
>
> But this way we do not explain if we can move faster than speed of light
> and what will happen than.
>
> 2. Time for any frame of reference:-
>
> The way we refer any frame of reference is its age. Considering any origin
> we can define, we can assign age to all possible existences. Now age is not
> a vector quantity, being a scalar you can keep accumulating age slower or
> faster, but never negative. So any mass or energy can increase or
> accumulate more of this age.
>
> This is equivalent to ENTROPY in Thermal Physics where net entropy can
> stay constant or increase but never decrease.
>
> From the above analysis basically I conclude that
>
> "Starting any point in reference, mass and energy can only age. Based on
> rate of ageing they appear to refer to past present or future. You can
> observe light or mass emanating from past events to appear in present, but
> these particles have dissociating themselves from past. Similarly you cause
> mass or energy to dissociate from present which will appear in future."
>
> I will appreciate any feedback to pratap_singh@hotmail.com
>
> CCD Data Acquisition wrote in article
> <32AC5F38.148@space.mit.edu>...
> > Cisco wrote:
> > >
> > > What if motion is in circle so as you keep travelling very fast but
> > > visiting the
> > > same point more than once.
> >
> > You still haven't traveled a distance cT. However my notion is still
> > naive and probably invaild but I was trying to make the point that one
> > may be able to travel back in time but not interact wit the past.
> >
hi
one thing i can't fully understand by people thoughts about the speed of light and time travel is that you say
>The possibilities are if you move at or near the speed of light, the faster you move slower the time will pass
>and that way you will land into future. At speed of light entirety will flash pass you, without time even
>changing in your time frame.
If time dosn't change in your time frame but changes all around you who's time frame is that?
Are we exsiting on different time frames now or do we change time frames when we reach the speed of light?
Also my theories about time and space relate more to do with gravity and magnetic fields. Everthing in the
galaxy posses these two items.
But light can get distorted by magnetic poles, black hole.
Our bodies at light speed travel would need gravity or a magnetic field to hold us together.
i have other thoughts if you would to here them please feel free to email your thoughts:)
mitech@ans.com.au
Subject: Re: Creation VS Evolution
From: gibgric@mailbag.com (Michael Grice)
Date: Thu, 12 Dec 1996 03:13:30 GMT
"Todd K. Pedlar" wrote on Wed, 11 Dec 1996
16:52:24 -0600 in talk.origins:
>bob puharic wrote:
>>
>> Judson McClendon wrote:
>> >> I
>> >Sure it works, 'for some things'. The problem with evolution is trying
>> >to take inference and use it to prove something which is absolutely
>> >impossible to prove with inferrence.
>>
>> evolution is consistent with other sciences. do you doubt them too?
>> why pick on evolution? how about physics? medicine....
>
>There's not much of an argument there; I'm not so sure you can say that
>evolution is consistent or inconsistent with other sciences. Evolution
>has not much of anything to do with physics, astronomy, etc.,
>whatsoever.
>Your statement is akin to saying that baseball is consistent with
>hopscotch.
No, not really. Evolution is certainly consistent with modern
geology, and with genetics as well. Evidence obtained by geologists
and geneticists supports evolution.
Physics and astronomy are consistent with evolution, also, in the
sense that physics and astronomy point to an ancient universe; an
ancient universe is consistent with evolution.
Many of the dating methods used in the evolutionary sciences rely
heavily on physics. Radiometric dating methods obviously provide
important support for evolution.
I suspect there's more; this is just off the top of my head.
Michael Grice
gibgric@mailbag.com
Subject: A cunning plan!
From: Tom Thornhill
Date: Wed, 11 Dec 1996 14:13:13 +0100
Lets suppose that we build a Bussard ramjet, cunningly constructed to
reproduce itself ( fusion reactors could be tweaked to produce heavy
elements albeit slowly ). We then program the ramjet to fly off and
find the sort of black hole which may contain a wormhole, breeding
along the way. Once it gets to through the wormhole it needs to have
some way to work out where / when it is, and work out what the
rules for wormhole travel are. Once the ramjet has worked out how to
do it ( or more likely its distant offspring have ), it/they try and
make it back to Earth. Thus we send off one ramjet and get its
descendants back after a short delay - hopefully the smarter ones will
work out how to form a closed timelike loop to get back to near the point
in spacetime where the original ramjet left.
Now I'm not saying this is entirely practical ( cost, dubious chances of
forming the closed timelike thingies, feasiblilty of building self
reproducing ramjets, danger of mutant embittered offspring flying through the
solar system, minimal chance that the original idea of getting back to
earth would survive generations of kludged reproduction ), can anyone see a
reason why it's impossible?
--
------------------------------------------------------
Tom Thornhill, Ericsson Business Networks, Sweden
"All sufficiently complex systems must also be incomplete,
but designing them still beats real work!"
email: EXTR.QBCTHOL@MESMTPSE.ericsson.se
phone: +46 8 76 40077
Subject: Re: How Can Students Organize Their School?
From: cd001829@mindspring.com (Benjamin K. Bryan)
Date: 11 Dec 1996 23:27:44 GMT
In article , davk@netcom.com (David Kaufman) wrote:
> How Can Students And Teachers Organize At Their School
>
> For Math, Science And Ethics Excellence?
>
>
> What could you do or are doing at your school to create
>math, science and ethics excellence?
>
> There can be different kinds of leaders and followers
>in creating a student (or teacher) organization for
>excellence.
>
> First a few people with a will to create excellence are
>needed. Some will be capable in speaking, others in
>understanding, others in organizing, others in explaining,
>others in creating, and so on.
>
> For those who have the will (or vision) to organize for
>or to create excellence in math, science and ethics at their
>school, let's discuss here current pursuits, future
>possibilities, meaningful goals and strategies for improving
>education.
>
> I'm trying hard to develop meaningful materials that
>can help k-12 students, teachers and others achieve math,
>science and ethics excellence. That's my current ambition
>and undertaking. What's yours?
>
>
>For elementary school students, the school could organize a math fair
with booths and stuff, where you would have to solve a problem to get a
prize. You could also have a science fair, especially for the older ones,
and they could create their own science experiments and/or projects--that
way they would be able to learn about hypotheses and such.
C. M.
>
>
>--
> davk@netcom.com
Subject: Re: faster than light travel
From: curran@remove_this.rpi.edu (Peter F. Curran)
Date: 11 Dec 1996 22:22:42 GMT
In article <01bbe79d$612c5e40$bad044ab@prsingh-pc.cisco.com>,
"Cisco" writes:
>Hi
>
>I am quoting from the other post on this subject.
>
>Hi
>I have been interested in paradox of time travel and Find it of interest to
>share a few thoughts.
>
>Concept of time travel involves a particular interesting phenomena, if you
>go to past and alter it so much that this present never takes place, then
>will it ever actually happen. Second if you know the future of acts you are
>doing you may alter the acts and this future may never happen.
>
>Going by the paradigm of existence, the only possibilities here are that
>you can see what happened in past and particle or person can travel to
>future. The reverse being not true.
>
>Now considering the fact that in four dimension time-space continuum, time
>is a vector quantity and hence moving in both direction should be possible.
>
>What is factor which prohibits us to move mass in reverse direction???
>
>Considering the above problem I came across to possible answers.
>
>1. Explanation by way method to execute :-
>
> The possible method for changing the time continuum is to change the rate
>of moving along the time axis. The possibilities are if you move at or near
>the speed of light, the faster you move slower the time will pass and that
>way you will land into future. At speed of light entirety will flash pass
>you, without time even changing in your time frame.
>
> But this way we do not explain if we can move faster than speed of light
>and what will happen than.
>
Heh, I thought of this a while ago... To affect our "time
velocity" we need to exert a force along the time axis, perhaps
by sending some matter in the time direction opposite to which
we want to go. To slow down, we throw something else along our
direction of travel, coming to a halt. By this reasoning, if
we try to "force" the earth into the past, by equal and opposite
reaction we would accelerate towards the future. Of course, the
earth, being much more massive, is undetectably affected by
this proceedure. This silliness goes on and on....
>2. Time for any frame of reference:-
>
> The way we refer any frame of reference is its age. Considering any origin
>we can define, we can assign age to all possible existences. Now age is not
>a vector quantity, being a scalar you can keep accumulating age slower or
>faster, but never negative. So any mass or energy can increase or
>accumulate more of this age.
>
Actually, "age" can be measured from any convienient
reference, with the big bang being the only reference
with non-negative ages.
> This is equivalent to ENTROPY in Thermal Physics where net entropy can
>stay constant or increase but never decrease.
>
>From the above analysis basically I conclude that
>
> "Starting any point in reference, mass and energy can only age. Based on
>rate of ageing they appear to refer to past present or future. You can
>observe light or mass emanating from past events to appear in present, but
>these particles have dissociating themselves from past. Similarly you cause
>mass or energy to dissociate from present which will appear in future."
>
Err, I'd hardly call the above an analysis...
>I will appreciate any feedback to pratap_singh@hotmail.com
>
>
>CCD Data Acquisition wrote in article
><32AC5F38.148@space.mit.edu>...
>> Cisco wrote:
>> >
>> > What if motion is in circle so as you keep travelling very fast but
>> > visiting the
>> > same point more than once.
>>
>> You still haven't traveled a distance cT. However my notion is still
>> naive and probably invaild but I was trying to make the point that one
>> may be able to travel back in time but not interact wit the past.
>>
- Pete
Subject: Electronic Protection
From: Roberto Pérez García
Date: Thu, 12 Dec 1996 00:13:45 +0100
Hallo:
How are you?
I am an industrial engineer. specialized in automatic and industrial
electronic. I have an electronic
circuit that it runs perfectly indoor. The problem raises when the
circuit must run outdoor, because I can
not ensure that it will function same number of hours that indoor.
By this reason, I am looking for "something" to recover the box which
contains the electronic circuit. The
idea is that this "something" I am looking for, lets to the heat to go
out and it does not let to the
humidity to go into the box. I have thougth that the solution could be
some type of plastic, but I do not
know really what will be the best solution. Also, this solution must be
cheap, because if the circuit
costs 4$, the solution can not be more expensive. I know this is not an
easy subject, but I will accept
all your help.
It is important that we find a solution because in other way the project
I am working in, will be
incomplete. I will be be pleased if you know how can I attach this
problem and you tell me.
Thanks by your help.
Roberto Pérez.
Subject: Re: NASA lies, again.
From: daveg@halcyon.com (David B. Greene)
Date: Wed, 11 Dec 1996 23:35:41 GMT
Scott.Weiser@worldnet.att.net (Scott Weiser) says:
>sfk@zipcon.net (Shea F. Kenny) >wrote:
>
>>During a routine traffic stop by the U.P.D., (hesperos@netcom.com),
>>had an open container container of the following Quackinol:
lay off the quackinol hesp
>>}Kevin D. Quitt (Kevin@Quitt.net) wrote:
>>}: And by the way, the surface of the moon is not a vacuum.
>>}
>>}Not a perfect vacuum perhaps, but it would be better (harder) vacuum than
>>}that which can be produced in any laboratory on Earth.
>>
>> Huh? There is nothing difficult about a perfect vacuum sir.
>
>Wow! Hear that all you accredited scientists? Shea has developed the
>perfect vacuum! I wonder if he's got the patent on the process?
>
>Oh, wait a minute, I just figured it out....he didn't *develop* the
>perfect vacuum, he *is* the perfect vacuum....between his ears.
heh, no wonder there is a giant sucking sound every time he opens his
mouth. Well at least he didn't get lured into dreams of cold fusion,
sci-fi boy.
>Sorry, never mind, it's merely a natural abberation which cannot
>(hopefully) be duplicated.
>
>Which explains his penchant for post sans cogito....
I thought it was cogito error sum ...
Subject: Re: Complex Numbers in C
From: dik@cwi.nl (Dik T. Winter)
Date: Thu, 12 Dec 1996 01:38:19 GMT
In article <58n1u8$kng@frazier.backbone.ou.edu> ws@aix1.ucok.edu (Bill Stockwell) writes:
> No doubt, however, the old FORTRAN folks would REALLY scream about either repn.
Perhaps. But I am one (at least doing Fortran since 1971). There are
many programs that represent complex matrices as real matrices with
doubled dimensions.
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
