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  1. avoy

    Pipe cannot be opened because of rust

    The photo show a pipe fitting. The outer pipe is made of copper while is inner is apparently made of 203 steal. However, the 203 steal become rusted and cannot be opened. Is there a good way to open it without breaking it? For instance, perhaps with some chemical etching methods that I can...
  2. avoy

    feed methods?

    In Kraus book on antenna he mentioned two types of feeding https://res.cloudinary.com/engineering-com/image/upload/v1488549241/tips/feed_g1ujwf.psd But what will be the difference for these two methods?
  3. avoy

    EM version of duckbill check valves in fluid flow

    In fluid dynamics there is a duckbill check valve to prevent the reverse flow. In EM wave an antenna emmits/receive at the same efficiency. Is there anyway one can make a check valve for antenna so that it emmits more than received or vice versa.......or perhaps emitts without even receive?
  4. avoy

    semi-transparent plastic sheet changes color when wetted

    Is there any transparent or semi-transparent plastic sheet (or some other similar material?) that can change color when wetted?
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