Re: Inertial-dampening systems

From: Timo Nieminen (timo_at_physics.uq.edu.au)
Date: 02/15/05 

Date: Tue, 15 Feb 2005 10:43:23 +1000

On Tue, 14 Feb 2005 msadkins04@yahoo.com wrote:

> Timo Nieminen wrote:
> >
> > A little thought about receiving antennas might
> > suggest that two straight wire antennas side-by-side will still work
> even
> > if joined at the tips. A little further thought about transmitting
> > antennas (eg centre-fed straight wire antennas) might suggest that
> not
> > only is there no fundamental prohibition of currents being different
> in
> > different parts of a circuit, there's also no problem with transient
> > currents in open circuits.
>
> A little thought about antennas would suggest that instead of
> consisting of isolated loops (or rectangles, as in the case of my
> puzzle/query) they are attached by wires to circuits, thus providing
> configurations and current paths that do not exist in the scenario I
> provided, thus suggesting that your analogy is inapplicable and
> non-responsive.

Are you really claiming that there are no transient currents in antennas
exposed to transient fields when not connected to circuits?

> A little further thought about antennas would suggest that
> they use alternating currents, which again are inapplicable to the
> scenario I provided.

Are you really claiming that an antenna cannot detect a transient field?

> Another interesting fact about transmitting
> antennas is the fact that the ability to transmit circular EMW from a
> wire does not necessarily indicate that current is flowing in that
> wire. Alternating current, of the right frequency range given a
> particular power source, causes electrons in a conductor to vibrate
> back and forth without actually flowing as current. That increased
> lattice energy is radiated as radio-frequency EMW.

Yes, that would be a most interesting "fact". Now, I realise that many of
the introductory electromagnetics books aimed at physicists don't deal
with antennas, but the more advanced ones usually do, at least briefly
(with Landau 2 being a prominent exception, iirc), and most of the
engineering oriented books cover them in some detail.

Technically, your "fact" is actually a fact if you're describing
a waveguide-fed dielectric antenna or the like. However, you did specify a
conductor.

Now, I am interested in knowing whether you are just arguing out of
belligerent contrarianism, or whether you REALLY, REALLY, believe that you
CANNOT have transient currents induced in conductors by transient fields.
Which is it? 

-- 
Timo

Relevant Pages

  • Re: How To Fix Startup Files That Do Not Startup?
    ... "mbhinz" wrote ... I have run registry cleaners, ... problem persists. ... Most users don't need these services so there is normally no downside to disabling them. ...
    (microsoft.public.windowsxp.general)
  • SPAMMERS? Re: [Info] Programmers Search Engine
    ... Listed for spamming at dnsstuff.com in 5 places: ... Failed: APEWS SPAMBAG SORBS-SPAM SPAMCANNIBAL ... DNSReports wasn't too kind to them either. ... Doncha just love automation? ...
    (microsoft.public.windowsxp.general)
  • Re: Add/Remove Programs feature question for Java updates
    ... There is a little icon on the right side of the bar at the bottom of screen reminding me that an update for Java is available. ... According to the list of installed programs that populates when you go to remove a program, I have the following Java updates installed on my machine: ... J2SE Runtile Environment Update 5 ... You should remove previous versions before installing the latest. ...
    (microsoft.public.windowsxp.general)
  • Recently used Categories list is too short
    ... since4 I have a high resolution monitor and I use categories ... the little four-pane "categorize" button on the toolbar. ... tools that make categorization easier would be greatly appreciated. ...
    (microsoft.public.outlook)
  • updating values in gridview
    ... Dim ActHourRate As Decimal ... For Each gvr As GridViewRow In GridView1.Rows ... for line Dim HourType As String = ...
    (microsoft.public.dotnet.framework.aspnet.webcontrols)