quarterwave

9 ms·

1. 1.▲
   by quarterwave 11y ago

   This is in fact a profound question. The physics of electricity propagation in a powerline circuit is fundamentally the same as the propagation of FM radio waves, or even the beam from a flashlight. All of these examples involve electromagn
2. 2.▲
   by quarterwave 12y ago

   Erlang = Owls (message passing)
3. 3.▲
   by quarterwave 12y ago

   Crystalline III-V channels can be grown epitaxially on silicon substrates, with buffer layers to grade the strain due to crystal lattice mismatch. With silicon wafers heading to 450mm diameter the economics would argue against native III-V
4. 4.▲
   by quarterwave 12y ago

   I am reading this book 'The Dollar Trap: How the US dollar tightened its grip on global finance' [1], where economist Eswar Prasad explains how money flows into the US from around the world even when troubles originate in U.S fina
5. 5.▲
   by quarterwave 12y ago

   Thanks, good point about telcos.
6. 6.▲
   by quarterwave 12y ago

   Interesting work! At first glance it would seem that Erlang or Akka provide a proven infrastructure for building such a multi-agent system+. Yet, a key construct is the notion of time and its passage. (+Which is subtly different from an age
7. 7.▲
   by quarterwave 12y ago

   I have home back-up power based on an inverter charging a lead-acid battery (located in a sheltered area outside the home), which costs about $100/kWh. Usage is about 1-2 hours discharge per day. No matter how well serviced, I've
8. 8.▲
   by quarterwave 12y ago

   This is an excellent 'road map' to the two key theorems of information theory. The focus on decoding complexity in the noisy coding theorem is particularly welcome. A separate article amplifying just this aspect (error exponent, P
9. 9.▲
   by quarterwave 12y ago

   Thanks for this reference.
10. 10.▲
    by quarterwave 12y ago

    Thanks for the detailed perspective. My limited & roseate view of a 21st century Lisp machine is based on an old theme - a massively parallel computing system using bespoke silicon logic blocks. As you have noted below, not only are the
11. 11.▲
    by quarterwave 12y ago

    Any chance of a resurgence in Lisp machines? Especially in view of the changes in CPU architecture due to semiconductor scaling challenges.
12. 12.▲
    by quarterwave 12y ago

    i used to be a college teacher for several years & my sympathies are with the author. Advice for those considering this path in science/tech - learn to write code on the side. Pick something mainstream that will be around for a whi
13. 13.▲
    by quarterwave 12y ago

    That's correct, thanks for pointing it out.
14. 14.▲
    by quarterwave 12y ago

    Is there an Erlang shell to evaluate expressions? There seems to be a sub-window to the right of the module editor, but I'm unable to place the cursor there. Tried in both Firefox 35 and Chrome 39.
15. 15.▲
    by quarterwave 12y ago

    While the Jeeves stories are good, they can't hold a candle to the time when lawlessness raised its head at Blandings Castle, or to the effect of Mulliner's Buck-u-Uppo tonic on the Bishop and the Vicar (quoting from memory, e.&am
16. 16.▲
    by quarterwave 12y ago

    Thanks for pointing this out. The role of muon instead of proton could be: (i) to make the bond detectable as the muon decays, or (ii) 10X lighter mass of muonium compared to regular hydrogen leads to a dynamical regime with saddle points i
17. 17.▲
    by quarterwave 12y ago

    Thanks for both explanations.
18. 18.▲
    by quarterwave 12y ago

    Why is the muonic hydrogen required? From the Bohr formula the Rydberg energy of the muonic hydrogen would be some 200 times larger than regular hydrogen. Anyone know how that plays a role? It can't be sqrt(spring/mass) for vibrat
19. 19.▲
    by quarterwave 12y ago

    The DSL reminds me of Fenics http://fenicsproject.org/
20. 20.▲
    by quarterwave 12y ago

    Thanks for the clear reply. I also read your paper. Immutable should be adequate for avoiding the serialization tax in hybrid applications that need 'symmetry breaking' of location transparency.
21. 21.▲
    by quarterwave 12y ago

    Can Orleans grains within a single thread share state without message passing via the interface?
22. 22.▲
    by quarterwave 12y ago

    Processor clock frequency scaling is limited by two factors: (i) logic signal delays, and (ii) processor power dissipation (heat). In broad brush strokes, a processor core needs to shunt buses of signals across several timing domains. Due t
23. 23.▲
    by quarterwave 12y ago

    Feynman-II has a nice chapter describing the idea of curved spaces: http://www.feynmanlectures.caltech.edu/II_42.html The chapters on electromagnetism and special relativity are outstanding: starting with why the magnetism
24. 24.▲
    by quarterwave 12y ago

    Would the symmetry groups (point groups?) be different for 3D?
25. 25.▲
    by quarterwave 12y ago

    The impedance of free space is (unfortunately) a few hundred ohms. On top of this, the minimum signal voltage of analog integrated circuits is set by unsystematic (random) offsets, which get worse as transistor sizes shrink. It's possi
26. 26.▲
    by quarterwave 12y ago

    Consider the use case suggested by the image on the copy i.e; on-screen projection of slides in a business meeting. Can this use case be met with a tablet/smart phone using a VGA adapter?
27. 27.▲
    by quarterwave 12y ago

    Nice trick, to cancel the e^2 from (h/e)^2 and h/e^2 to give h, and do it a way accessible to a basic laboratory. The interesting thing about h/e^2 as Hall resistance is that it's an off-diagonal term in the Onsager matr
28. 28.▲
    by quarterwave 12y ago

    "Finding talent in Hi Tech centers like Bangalore is almost as hard as finding qualified people in Silicon Valley." This is a good point. A related question: Can more and better work be done by less people? If so, are '
29. 29.▲
    by quarterwave 12y ago

    Yes, agree that log() wouldn't result from a linear operator. The idea behind my question: does the Shannon entropic integral correspond to the L2 length of some projected state? Leading to a prescription to prepare a state with minimu
30. 30.▲
    by quarterwave 12y ago

    @obastani : very good comment. Aside: If |Psi> is a state with wavefunction <x|Psi>, then is there a linear operator A such that <x|A|Psi> = log(<x|Psi>)? Note: Logarithm of a complex function.