wave-particle duality and TV reception
 

In article , Roderick Stewart
wrote:


My life's experience, all the way from childhood, would suggest that
most girls and women avoid involvement in technology because most of
them are simply not interested.

However that still may be a 'conditioned response' which is indoctrinated
long before they approach the end of schooling. The young tend to pick up
their ideas from their peers and the ones who are a year or two older at
school. Hence may be acquired as just one part of a general social set of
fitting in.

IIRC the stats indicate that women are far more likely to take an interest
in 'science' if they went to a single-sex school.

After that they tend to run into the assumptions, etc, in workplaces, etc.
Again, as a part of the general taken-for-granted assumptions of society.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

wave-particle duality and TV reception
 

On Thu, 11 Dec 2014 10:09:53 +0000 (GMT), Jim Lesurf
wrote:

In article , Bill Wright
wrote:
The whole science of RF seems to be based on wave theory. Does particle
theory have any place?

In general the frequency ranges and power levels associated with 'RF' tends
to mean that you get a lot of photons for yer money. :-)

So in practice the photon approach only matters much in some specific
fairly extreme cases. e.g. if you're trying to work with ultra low signal
levels at very high frequencies and photon shot noise becomes a limit.

More usually the coherent properties matter far more, so wave theory makes
more sense.

That said, one possible place for photons is in 'explaining' the currently
trendy ideas of 'microwave beams with angular momentum'. But if you look
into that bear in mind that some of what it said may look baffling because
it is what academic jargon would call 'baloney'. :-)


Which neatly takes us back to that 'sausage reference' again. :-)
--
J B Good

wave-particle duality and TV reception
 

In article ,
Roderick Stewart wrote:
On Thu, 11 Dec 2014 08:12:29 -0000, "Woody"
wrote:

Looks like the RS Christmas Lectures this year will be
interesting - being delivered by a woman (name escapes me)
who is Professor of Radio Frequency Engineering at UMIST.

Yes, I find it genuinely encouraging that such creatures exist, as in
all the time I spent in broadcast engineering, I never met one.

we had one in our department for a couple of years and there was another
with TCPD in Warwick whom I talked to on the phone fairly often. I met her
once at an RF Safety Conference at ERA. She was the only women aout of soem
50 engineers.

--
From KT24

Using a RISC OS computer running v5.18

wave-particle duality and TV reception
 

Now you are just being silly. However waveguide theory seems to be
suggestive of um, waves, not particles, its probably something really
obvious that is cocking up the theories .
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Robin" wrote in message
...
I'd prefer a demonstration of Nicholas Kurti's inverted baked Alaska -
meringue cooked inside ice-cream, showing how microwaves are
differentially absorbed by ice and water.

Would be even better if the demonstration achieved Kurti's - probably
mythical - goal of using helium to acheive lighter-than-air meringue!

--
Robin
reply to address is (meant to be) valid

wave-particle duality and TV reception
 

Silly? Well if I recall rightly he demonstrated the inverted baked
Alaska on TV in 1969 - and I used to know people who'd had it at his
dinner parties.

As regards the use of helium to make meringue, do please bear in mind
this was a man who regularly made them using a vacuum chamber.

He was a colourful lecturers too (but sadly IME never brought food to
share).




--
Robin
reply to address is (meant to be) valid

wave-particle duality and TV reception
 

how would you get them down from the ceiling?

I wouldn't have put it past Kurti to serve them with a sauce made with
heavy water :)

--
Robin
reply to address is (meant to be) valid

wave-particle duality and TV reception
 

"charles" wrote in message
...
In article ,
Roderick Stewart wrote:
On Thu, 11 Dec 2014 08:12:29 -0000, "Woody"

wrote:

Looks like the RS Christmas Lectures this year will be
interesting - being delivered by a woman (name escapes
me)
who is Professor of Radio Frequency Engineering at
UMIST.

Yes, I find it genuinely encouraging that such creatures
exist, as in
all the time I spent in broadcast engineering, I never
met one.

we had one in our department for a couple of years and
there was another
with TCPD in Warwick whom I talked to on the phone fairly
often. I met her
once at an RF Safety Conference at ERA. She was the only
women aout of soem
50 engineers.



As a trainee at Pye back in the 70's I used to work with a
girl who tested (and fixed!) 130W mobile HF transceivers,
and boy was she good!

More recently my last employer decided to take on some
apprentices one of which I'm glad to say I spotted when she
came to an open evening. She is now a qualified electrician
and with the retirement of her mentor she is the area sparks
and still only in her mid/late 20's. I saw her a couple of
weeks ago and she is having a whale of a time.

As said before, I think much of it is conditioning in the
early part of senior school as few teachers have ever had
experience of anything else. One of the best lecturers I
ever had at Tech had been a design and lab engineer dealing
with servo and associated control systems with GEC before
moving into education. Just shows...............?


--
Woody

harrogate three at ntlworld dot com

wave-particle duality and TV reception
 

Jim Lesurf wrote:

My life's experience, all the way from childhood, would suggest that
most girls and women avoid involvement in technology because most of
them are simply not interested.

However that still may be a 'conditioned response' which is indoctrinated
long before they approach the end of schooling. The young tend to pick up
their ideas from their peers and the ones who are a year or two older at
school. Hence may be acquired as just one part of a general social set of
fitting in.

I did a lot to avoid sexual stereotyping with my kids. It made no
difference. The girls developed girly interests; the boy developed
masculine interests. Of course, parents are only one influence on a
child, and in any case they probably model themselves on their parents.

Bill

wave-particle duality and TV reception
 

On Thursday, 11 December 2014 05:25:36 UTC, Bill Wright wrote:
The whole science of RF seems to be based on wave theory. Does particle
theory have any place?

Discuss.

Bill


Waves, particles, neither, both? Who knows?

Treating EM waves as "waves" makes the maths easier,(for some value of easier), for calculating aerial lengths, diffraction, etc.

But you can turn it around and say something like:-
The transmitter emits a stream of photons, some of which bang into the recieving aerial and knock electrons out of their orbits around the atoms. These bang into the next atom up, and then the next, and if you get enough of them, you end up with an electric current to feed into the receiver.
Simples!

It was a good program, though. Except I got lost at Bell's inequality.

Remember photons, electrons and such are not things as we understand it. Just as radio waves are not waves as we understand them, as they're not waves IN anything. Trying to think about it hurts the head.

As someone famous said:- If you're not shocked by Quantum theory, you haven't understood it. I think someone else said "No-one really understands it at all".

Good thinking, Ian.

wave-particle duality and TV reception
 

On Thu, 11 Dec 2014 18:51:10 -0000, "Woody"
wrote:

"charles" wrote in message
. ..
In article ,
Roderick Stewart wrote:
On Thu, 11 Dec 2014 08:12:29 -0000, "Woody"

wrote:

Looks like the RS Christmas Lectures this year will be
interesting - being delivered by a woman (name escapes
me)
who is Professor of Radio Frequency Engineering at
UMIST.

Yes, I find it genuinely encouraging that such creatures
exist, as in
all the time I spent in broadcast engineering, I never
met one.

we had one in our department for a couple of years and
there was another
with TCPD in Warwick whom I talked to on the phone fairly
often. I met her
once at an RF Safety Conference at ERA. She was the only
women aout of soem
50 engineers.



As a trainee at Pye back in the 70's I used to work with a
girl who tested (and fixed!) 130W mobile HF transceivers,
and boy was she good!

More recently my last employer decided to take on some
apprentices one of which I'm glad to say I spotted when she
came to an open evening. She is now a qualified electrician
and with the retirement of her mentor she is the area sparks
and still only in her mid/late 20's. I saw her a couple of
weeks ago and she is having a whale of a time.

As said before, I think much of it is conditioning in the
early part of senior school as few teachers have ever had
experience of anything else. One of the best lecturers I
ever had at Tech had been a design and lab engineer dealing
with servo and associated control systems with GEC before
moving into education. Just shows...............?


One evening, with his charge at full capacity, Micro Farad decided to
get a cute coil to discharge him. He went to the Magnet Bar to pick up
a chip called Millie Amp. He caught her out back trying self
induction; fortunately, she had not damaged her solenoid. The two took
off on his megacycle and rode across the Wheatstone Bridge into a
magnetic field, next to a flowing current , to watch the sine waves.

Micro Farad was very much stimulated by Millie's characteristic curve.
Being attractive himself, he soon had her field fully excited. He set
her on the ground potential, raised his frequency, lowered her
resistance, and pulled out his high voltage probe. When he inserted it
in parallel, he short-circuited her shunt. Fully excited, Millie cried
out, "ohm, ohm, give me mho". As he increased his tube to maximum
output, her coil vibrated from the current flow. It did not take long
for her shunt to reach maximum heat. Now with the excessive current
shortening her shunt, Micro's capacity rapidly discharged – every
electron was drained off. But that was not the end of it. Indeed, they
fluxed all night, tried various connections and hookings until his bar
magnet weakened, and he could no longer generate enough voltage to
sustain his collapsing field. With his battery fully discharged, Micro
was unable to excite his tickler, so they went home. A few weeks
later, they were merged forever and oscillated happily ever after.

--

Graham.

%Profound_observation%