Recent content by mcriv880

  1. M

    Graduate What materials would produce an impedance mismatch?

    https://docs.google.com/viewer?a=v&pid=explorer&srcid=0B-C2IpG-te-Lblhhd2V2eEh6WUk Please see pages 20, and 25.
  2. M

    Graduate What materials would produce an impedance mismatch?

    Yes I realize they are very high frequencies for air being above 1MHz but I was looking for the entire range from 20KHz-Above 1GHz with air as a medium. Not just one specific frequency.
  3. M

    Graduate What materials would produce an impedance mismatch?

    I'm interested in methods of deflecting/shielding ultrasound up to 3GHz traveling through air as a medium. My search lead me to the study of creating impedance mismatches to affect sound wavess. I'm looking specifically for the acoustic impedance necessary to act as a shield of sorts for...
  4. M

    Undergrad What type of equipment is required to detect ultrasound above 1MHz?

    Sorry I'm interested in detecting high freq sounds traveling through air.
  5. M

    Graduate What materials would produce an impedance mismatch?

    sufficient enough to redirect/shield against ultrasound 1MHz being directed through the air. i know a vacuum would. What I'm questioning is if you had 2 layers of different materials stacked on top of each other what could prevent the ultrasound from reaching the 2nd layer assuming the 1st layer...
  6. M

    Undergrad What type of equipment is required to detect ultrasound above 1MHz?

    Please list any links in you have them.
  7. M

    Undergrad How to test for radium contamination in rooms and bodies

    How can you test an area for radium cheaply, and how can you test your body for exposure. In other words how would you test a room? And what types of tests could you get yourself?
  8. M

    : If someone was burning your head with a energy directed device?

    : If someone was burning your head with a energy directed device? Say they were very rich and performing a mean prank and burning your head causing itching and hair fall out what types of devices could be used assuming they had millions to spend.
  9. M

    Undergrad How to ground EMF shielding/clothing?

    No it's not only radio frequencies. The metal, or combo of metals must block radio, infared, x-ray, etc.
  10. M

    Undergrad How to ground EMF shielding/clothing?

    Yeah but what type of metal? X Ray hats can be bought online however I'm talking about the entire spectrum, and the manufacturing of one, not the purchase.
  11. M

    Undergrad How to ground EMF shielding/clothing?

    You didn't read my question I'm referring to EMF shielding not sandwich foil.
  12. M

    Undergrad How to ground EMF shielding/clothing?

    For example if a hat is lined with nickel, silver, EMF paint, etc. , then how do you ensure the hat is grounded? I am a little unsure what grounding means relating to these forms of usage as I have seen EMF protective clothing advertised as grounded.By EMF I mean sufficient for all freq with...
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