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Spinnor's latest activity
Spinnor
replied to the thread
I
Approximating smooth curved manifolds with "local bits" of curvature?
.
The dipole field pattern below might work as a 2 dimensional "building block" for the fields of our bits. It shows some promise and...
Friday, 9:43 PM
Spinnor
reacted to
berkeman's post
in the thread
Construction
Short Dividing fence on my property: what are my options?
with
Like
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You've probably thought about this, but can the pool digging equipment make it in between 8 foot spaced fence posts?
Friday, 10:50 AM
Spinnor
replied to the thread
I
Approximating smooth curved manifolds with "local bits" of curvature?
.
Again consider the electric fields surrounding an antenna at an instant of time. We know that an antenna emits energy, suppose the...
May 16, 2024
Spinnor
replied to the thread
I
Approximating smooth curved manifolds with "local bits" of curvature?
.
I am having trouble coming up with a clear answer so will have to think a bit more. Thanks.
May 14, 2024
Spinnor
reacted to
marcusl's post
in the thread
I
Plane wave decomposition of the fields of a dipole antenna
with
Like
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Agreed, if you are after a Hertzian dipole then the case is settled.
May 13, 2024
Spinnor
replied to the thread
I
Plane wave decomposition of the fields of a dipole antenna
.
"To this author, there is very limited physical reality to the inhomogeneous plane waves [describing the near field] identified in the...
May 13, 2024
Spinnor
replied to the thread
I
Plane wave decomposition of the fields of a dipole antenna
.
I am sure you would understand the paper I linked. I think my question is answered? The fields of a Hertzian antenna can be decomposed...
May 11, 2024
Spinnor
replied to the thread
I
Plane wave decomposition of the fields of a dipole antenna
.
This paper may also help, buy allowing the wave vector to be complex we can get near fields? Thanks for your help...
May 10, 2024
Spinnor
posted the thread
I
Approximating smooth curved manifolds with "local bits" of curvature?
in
Differential Geometry
.
Consider the electric and magnetic fields around a dipole antenna, Suppose these fields represent some type of curvature in space...
May 7, 2024
Spinnor
posted the thread
I
Plane wave decomposition of the fields of a dipole antenna
in
Classical Physics
.
A dipole antenna will have near fields and far fields. Can both the near and far fields can be decomposed into an infinite sum of plane...
May 7, 2024
Spinnor
replied to the thread
B
Antenna induction, oscillating circuit generating EM Waves
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I don't think I read the text. The picture of the capacitor morphing into an antenna forces you to also imagine how the displacement...
May 6, 2024
Spinnor
replied to the thread
B
Antenna induction, oscillating circuit generating EM Waves
.
The last image you included in your post is interesting, could you post the source of that image or the text that went with the image. A...
May 5, 2024
Spinnor
reacted to
gmax137's post
in the thread
Looking for old mathematics textbooks (high school to undergrad level)
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Like
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Consider making a list and sharing it on PF; there may be interest in buying or at least providing good homes for the books. If they...
Apr 28, 2024
Spinnor
reacted to
Meir Achuz's post
in the thread
I
"Strange contradiction" that Maxwell found and resolved
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The equation, $$\nabla\times{\bf H}=4\pi{\bf j}/c$$, contradicts the continuity equation because, $$\nabla\cdot(\nabla\times{\bf...
Apr 21, 2024
Spinnor
reacted to
hutchphd's post
in the thread
I
Why is the emissivity of metals low?
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A black body both absorbs and emits radiation. In fact for any wavelength light the emissivity and absorbtivity are exactly equal (this...
Apr 7, 2024
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