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admin 26.06.2015

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I hope you looked over your shoulder before you too that photo.You would have, essentially, a two wire transmission line with resistive loading across it. Quoteinterface between the lines and the ground.I was assuming that the two lines would be propagating in balanced mode. I think the magnetic steel rail and the water in the ground would have an effect on the propagation velocity. Train track scrapbook layouts are a fun way to catalog travels and make creative photo display pages.
If you already have a habit of photographing train tracks during your travels, you probably already have an impressive photo collection of various train tracks.
Include souvenirs from your train travels, such as ticket stubs or a dining car menu, in the scrapbook. Train Track Frame: Draw a frame on a cardstock paper and then create a train track design on the frame.
Train Conductor and Train Car: Draw a train conductor and train car on cardstock, color in details with colored pencils or markers and then carefully cut them out. There are many websites on the Internet that offer free downloadable fonts for train scrapbooks.


Urban Fonts: The Urban Fonts site offers free downloads of fonts suitable for train scrapbooks.
Dafont: The site has several fonts that would work well for train scrapbooks - Optimus Princeps, Northwood High and Veteran Typewriter.
Stickers n Fun: The Stickers n Fun site has two sample train scrapbook pages that incorporate tracks in the layout.
If the sleepers were dry concrete and the ballast was dry, too (keeping the shunt resistance low), the pulse could travel a long way and be detected hundreds of miles away, I should imagine. Does your remark assume the unbalanced mode?Of course, both modes would propagate but I would think the balanced mode would have fewer losses. Current would flow over a big area of ground and this could easily induce a current pulse in the lines - as they are so extended. The majority of the current flowing on the lines would be on the outside of the conductors (skin depth) so the external magnetic field (transverse electric and magnetic - TEM mode) will not actually pass through the steel of the rails. Photographing train tracks is an art and the right layout can show off the beauty of the train tracks. The lines would act like a huge antenna which would carry energy away.It struck me (sorry for the pun) that where the lightning path is non-vertical, there would be a significant amount of current induced directly into the lines by the component of the current in the arc parallel with the lines.
Whatever the direction of the fields or currents which start the wave, it soon settles down into a conventional wave along the line.Water makes things much more difficult.


If a lot of current flows across the track through the train then this will launch a pulse which will also travel down the line. In this case, I guess, the propagation mode would be unbalanced for longer wavelengths associated with the pulse.I guess we need some factual input about actual cases of lightning strike. A good, wet bit of ground could behave almost as well as a metal Earth and could support an unbalanced mode for low RF frequencies (same as a microstrip printed circuit line). The TQF Freightrain font and the TQF Word Train font spell out words in a sleeker train car format suitable for adults.
A pulse can either be caused by a voltage pulse (E field) across the lines or a current  (H field). As you say, the Current can follow the low resistance path but some of  the Energy propagates down the line rather than being dissipated in the resistance across it.
If the ground is damp, of course, there would be much more loss because the dielectric constant becomes a complex number and the resistive component is low enough to absorb the wave.I might mention that the dielectric constant can vary a lot with frequency.



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  • milaska, 26.06.2015 at 14:19:43
    These couplings, which hark back to the attachment.
  • QANQSTER, 26.06.2015 at 23:49:35
    Two ramps, a single on every side, and when.