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2A4Fh56OSA (talk) 18:48, 2 January 2013 (UTC) It seems like your formulas in the dipole antenna article do not show up correctly. 2A4Fh56OSA (talk) 19:09, 2 January 2013 (UTC)The align stuff does not work (?) I have taken out this nice formatting stuff and now the formulas show up correctly. Nevertheless - they don't look nice any more :/
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Again, welcome! RockMagnetist (talk) 19:17, 4 September 2012 (UTC)
Hi - thanks again for your very hard work, apologies that your altruism has been neglected (especially on my part, for at least a couple of years?)... You may like to see this article, since it included that "F = d(mv)/dt" nonsense... I cleared it today out but you may still like to edit the article anyway. Thanks, Maschen (talk) 23:02, 11 September 2012 (UTC)
Hi, just so you know I created SVG files for:
All except No6 uploaded successfully, 6 is drawn but apparently there is an "internal error" (there definitely shouldn't be, so will fix as soon as possible). Thanks, Maschen (talk) 03:34, 16 September 2012 (UTC)
Surely there are plenty, though here is an extremely good applet for showing orbital trajectories for 4 celestial bodies: [1]. If you find any good places, this may be a useful external link, also it's pretty fun! Just thought to let you know. An excellent demonstration of sensitivity of orbits to initial positions and velocities, hence the chaotic behaviour in a 4-body system. Maschen (talk) 03:45, 16 September 2012 (UTC)
Zueignung, thanks for reverting the IP vandalism on Magnetic field. You may already know about them, but you might find Wikipedia:Template messages/User talk namespace useful. After a revert, these can be placed on the user's talk page to let them know you considered their edit inappropriate, and also to direct new users towards the sandbox. Or you can install Twinkle to make the process easier. If users keep vandalizing pages, they can get increasingly stern warnings or even be blocked from editing (see also Warnings). RockMagnetist (talk) 15:54, 17 September 2012 (UTC)
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Improve it please, make the chirp stronger - unlike in the old image, I can no longer see the chirp at a glance. Since the entire point is to show the chirp, this is a serious defect. — Preceding unsigned comment added by 2001:630:12:10C6:217:8FF:FE2A:A8ED (talk) 11:03, 29 October 2012 (UTC)
You should be aware that the standard for physical quantities is italics. Please see rules set by the Bureau International des Poids et Mesures (BIPM) Section 5.3.1. You could also view this standard at ISO 31-0. I am reverting your changes at Angular momentum. You might have noticed I am changing Wikipedia articles to follow this international standard. Thanks for any assistance in this matter. Dger (talk) 20:28, 14 November 2012 (UTC)
The claims wouldn't be so puzzling if you consider that:
Circuit dreamer (talk, contribs, email) 16:30, 24 December 2012 (UTC)
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I think the dipole impedance formula is not correct for the reactance part in particular. I don't know what the correct formula is. But to see that this one is wrong just consider what happens when the diameter value, "a", is either zero or close to zero. The Ci() term that contains "a" either is minus infinity or close to it. And this propagates out to the value of X_dipole. This would be wrong. — Preceding unsigned comment added by Ttdoucet (talk • contribs) 20:16, 19 January 2013 (UTC)
I don't consider myself an antenna expert either, but I have some experience with them and I looked into the issue a little more deeply. In a nutshell, I think the estimate for the reactive part is not useful, and it is not clear that a useful closed-form estimate is known. The resistive part is probably fine. It is easy to provide an example of where the reactive calculation goes astray: a 3/4-wave dipole with ordinary wire diameter of a few mm. The calculation will indicate that the reactive part is capacitive, but it is clearly inductive, through both modeling and practice. What happens specifically in the computation is that the correction involving the diameter takes over the computation, and causes the reactance to change sign. I believe that what is going on at a more fundamental level is that when deriving this formula there is an assumption of a sinusoidal current distribution on the antenna, and no current at the ends. This is certainly true for odd multiples of a half wavelength, but perhaps not true for other cases. So the end result is that the reactive part ends up being true around odd multiples of a half wavelength, but wrong, or at least extremely misleading, at other lengths. I believe a more conservative approach might be to give the formula for the resistive part, but not offer a formula for the reactive part, except near odd multiples of a half wave. (This is the approach that the well-known book by Kraus takes.)
Ttdoucet (talk) 19:33, 20 January 2013 (UTC)
Hi! I'm not sure if you're aware of the up-and-coming Wikipedia:MOSPHYS (physics manual of style on WP). It's not complete yet (there's probably a lot still to do). You set good typesetting standards, so if there's anything you want to add/change, it would be beneficial for the project. I may be carrying over some of your recommendations from your user page, (unless you beat me to it), if that's ok. Best, M∧Ŝc2ħεИτlk 16:37, 10 February 2013 (UTC)
I saw the wiki page, but I couldn't find any examples using actual numbers to evaluate the formula. Could you give some examples of convolution, please? Mathijs Krijzer (talk) 22:07, 9 March 2013 (UTC)
The convolution of f and g is written f∗g, using an asterisk or star. It is defined as the integral of the product of the two functions after one is reversed and shifted. As such, it is a particular kind of integral transform:
The convolution of two complex-valued functions on Rd
is well-defined only if f and g decay sufficiently rapidly at infinity in order for the integral to exist. Conditions for the existence of the convolution may be tricky, since a blow-up in g at infinity can be easily offset by sufficiently rapid decay in f. The question of existence thus may involve different conditions on f and g.
When a function gN is periodic, with period N, then for functions, f, such that f∗gN exists, the convolution is also periodic and identical to:
Main article: Circular convolution |
When a function gT is periodic, with period T, then for functions, f, such that f∗gT exists, the convolution is also periodic and identical to:
where to is an arbitrary choice. The summation is called a periodic summation of the function f.
For complex-valued functions f, g defined on the set Z of integers, the discrete convolution of f and g is given by:
When multiplying two polynomials, the coefficients of the product are given by the convolution of the original coefficient sequences, extended with zeros where necessary to avoid undefined terms; this is known as the Cauchy product of the coefficients of the two polynomials.
Hi! I enjoyed the contents of your user page very much and I will take your advice and try to improve my own lamentable performance.
However your remarks about:-
seem to me distinctly out of place.
These are all technical terms with a precise meaning, no other word will do. In a number of professions you would attract some very strange looks if you described these terms as 'worthless jargon'. Calling it worthless jargon would merely indicate that you did not know anything about the matter in hand.
Currently I am banned from editing on one topic because I probably went too far in insisting on the accurate use technical terms. Too bad! But I applaud your talk page and will do my best to follow (most of) what you write.
Have a nice day! --Damorbel (talk) 07:26, 25 July 2013 (UTC)
why did you want to keep the wrong thing on newtons laws? It is not only ugly is is incorrect
TheZelos (talk) 05:44, 10 April 2015 (UTC)
Sorry, our edits crossed -- I was attempting to restore your previous version. Probably some interpolated version would be best. --JBL (talk) 03:40, 29 August 2015 (UTC)
Hi,
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