3 ms·

Even 5GHz wireless phone base units won't penetrate a single layer of standard concrete blocks, like you have in home construction in Florida. Yet 2.5Ghz (WiFi

Even 5GHz wireless phone base units won't penetrate a single layer of standard concrete blocks, like you have in home construction in Florida. Yet 2.5Ghz (WiFi etc.) or below (presumably part 15 at 100 mw) exhibits very little apparent attenuation throughout or outside the house. You may want to check out the Atmospheric Absorption by Frequency chart at the RFCafe site: http://www.rfcafe.com/references/electrical/atm-absorption.htm http://www.rfcafe.com/references/electrical/atm-absorption.h...

0x8BADF00D 8y ago
Would it be possible to quantum tunnel the wave packet through the solid wall of concrete? (In this case it would be the wave produced by an RF device)
- escherplex 8y ago
  To experiment with quantum tunneling you're dealing with phenomena manifesting at the 1nm scale. One macro level theoretical app for quantum conductivity seems to involve wave packets interacting with perfectly rectangular uniform tightly-spaced cation-nuclei barriers which theoretically allows free electron tunneling (IE, energy transmission). [1] Even if it works, seems like a lot of trouble given that an array of duplex repeaters in the attic could solve the problem. [1] https://en.wikipedia.org/wiki/Quantum_tunnelling https://en.wikipedia.org/wiki/Quantum_tunnelling BTW Anki as in J-flashcards or as in Robotics?
  - 0x8BADF00D 8y ago
    > One macro level theoretical app for quantum conductivity seems to involve wave packets interacting with perfectly rectangular uniform tightly-spaced cation-nuclei barriers which theoretically allows free electron tunneling (IE, energy transmission). That’s an interesting use case for quantum tunneling. 1 nm scale is hard for me to visualize mentally. When dealing with quantum mechanics, it seems that one should not even attempt to use intuition. The way systems behave at quantum scale is completely counterintuitive to me. Do you have any recommendations for lectures or books? > BTW Anki as in J-flashcards or as in Robotics? Robotics.
    - escherplex 8y ago
      A) math refresher: Basic Training in Mathematics - Shankar B) undergrad A-level text: Principles of Quantum Mechanics - Shankar Happened to like his approach given that he's trying to convey information with serviceable clarity given the subject matter without trying to impress you with his divine intellect, like some of the pedagogues who are legends in their own minds C) Road to Reality - A Complete Guide to the Laws of the Universe - Penrose Last one sounds pretentious but was a magnum opus. His postulates concerning consciousness as a synthesis of quantum functioning were probably a bit much. FWIW when studying Japanese back in 2002 I liked the Heisig method but wanted animated stroke order displays for the characters. Jim Breen at Monash in Australia had half the set in .gif but I had to coax Jack Halpern in Japan to release the other half. Armed with the full set I was finally able to digitize the Remembering the Kanji in a useful .html form for personal use over the space of a month (still keep it as a bookmarked local app in Firefox). When done, apps like Anki (tr: memorization) J-flashcards started showing up, duplicating the work. :)
- dnautics 8y ago
  No, that is not how quantum tunneling works.

0x8BADF00D 8y ago

Would it be possible to quantum tunnel the wave packet through the solid wall of concrete? (In this case it would be the wave produced by an RF device)

escherplex 8y ago
To experiment with quantum tunneling you're dealing with phenomena manifesting at the 1nm scale. One macro level theoretical app for quantum conductivity seems to involve wave packets interacting with perfectly rectangular uniform tightly-spaced cation-nuclei barriers which theoretically allows free electron tunneling (IE, energy transmission). [1] Even if it works, seems like a lot of trouble given that an array of duplex repeaters in the attic could solve the problem. [1] https://en.wikipedia.org/wiki/Quantum_tunnelling https://en.wikipedia.org/wiki/Quantum_tunnelling BTW Anki as in J-flashcards or as in Robotics?
- 0x8BADF00D 8y ago
  > One macro level theoretical app for quantum conductivity seems to involve wave packets interacting with perfectly rectangular uniform tightly-spaced cation-nuclei barriers which theoretically allows free electron tunneling (IE, energy transmission). That’s an interesting use case for quantum tunneling. 1 nm scale is hard for me to visualize mentally. When dealing with quantum mechanics, it seems that one should not even attempt to use intuition. The way systems behave at quantum scale is completely counterintuitive to me. Do you have any recommendations for lectures or books? > BTW Anki as in J-flashcards or as in Robotics? Robotics.
  - escherplex 8y ago
    A) math refresher: Basic Training in Mathematics - Shankar B) undergrad A-level text: Principles of Quantum Mechanics - Shankar Happened to like his approach given that he's trying to convey information with serviceable clarity given the subject matter without trying to impress you with his divine intellect, like some of the pedagogues who are legends in their own minds C) Road to Reality - A Complete Guide to the Laws of the Universe - Penrose Last one sounds pretentious but was a magnum opus. His postulates concerning consciousness as a synthesis of quantum functioning were probably a bit much. FWIW when studying Japanese back in 2002 I liked the Heisig method but wanted animated stroke order displays for the characters. Jim Breen at Monash in Australia had half the set in .gif but I had to coax Jack Halpern in Japan to release the other half. Armed with the full set I was finally able to digitize the Remembering the Kanji in a useful .html form for personal use over the space of a month (still keep it as a bookmarked local app in Firefox). When done, apps like Anki (tr: memorization) J-flashcards started showing up, duplicating the work. :)
dnautics 8y ago
No, that is not how quantum tunneling works.