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  1. Vanadium 50

    I QCD and jets

    I'm not going to argue with you.
  2. Vanadium 50

    I QCD and jets

    Vertices are not real things. The four-gluon vertex is not gauge invariant by itself and it may not even be finite. The real things are amplitudes, or at least event rates.
  3. Vanadium 50

    Question about getline with fstream

    There's the old line "I took a speed-reading class and was able to read War & Peace in twenty minutes. It's about Russia."
  4. Vanadium 50

    Question about getline with fstream

    All the faster. :wink:
  5. Vanadium 50

    Question about getline with fstream

    A time goal without a learning goal can be met just by waiting.
  6. Vanadium 50

    I QCD and jets

    You mean TASSO, right?
  7. Vanadium 50

    Odd evolutionary outcomes: green fur, body fat, anything else?

    Is that really true? Much of what I have seen, even for woodland, is gray, tan and brown. (I will not speak of the US Navy's former "aquaflage" fiasco)
  8. Vanadium 50

    Can a 4 stroke ICE be oil-less?

    It's probably also worth thinking about what problem you're trying to solve. It may be theoretically possible to save $1000 in lubricants by going from a $2000 engine to a $10,000 engine, but that doesn't mean many people will do it.
  9. Vanadium 50

    Can a 4 stroke ICE be oil-less?

    I know there is research in using soot as a lubricant. (Usually it gets mixed in the oil and has the opposite effect). I don't know if it has gotten past the "I don't understand it. This should work." phase.
  10. Vanadium 50

    Odd evolutionary outcomes: green fur, body fat, anything else?

    Would a kelly green deer be really harder to see than an ordinary one?
  11. Vanadium 50

    B How long before someone builds a machine to predict the future?

    It's been done. And it predicts this thread will be closed before too long.
  12. Vanadium 50

    Computer languages tend to be transient

    It would be foolish to become the world's expert on Just One Chip, but I can't help but point out the Z80 is still around. They run toasters and not personal computers these days, but they are easy enough to come by. I could have one on my desk tomorrow. They start at around $5.
  13. Vanadium 50

    Technology and the chronology of expressions

    And I have never heard that outside of internet origins of phrases threads.
  14. Vanadium 50

    New Visa Restrictions on International Students

    Some advice: 1. When they say feedback is only available through the following channels, they really really mean it. Feedback through other channels will not just be ignored, it probably won't even be delivered to the decision-makers. 2. In the feedback, make sure that it is clear that you...
  15. Vanadium 50

    I What Mechanism Creates the Jet Emanating From a Quasar?

    I find this hard to believe. Are you missing a not? As far as the other two, the energy driver is accretion. Matter is falling and giving up energy as it does so. If you had no frame dragging and no magnetic fields, you would still have the energy. Indeed, as magnetic fields can do no work...
  16. Vanadium 50

    Question about getline with fstream

    This and this are mutually inconsistent. You can't have written code that both tests for read errors and doesn't find a read error.
  17. Vanadium 50

    I Quantum Measurements with Gravitational Waves

    Continuous means np breaks are allowed. Continual means they are. (e.g. daylight is continual)
  18. Vanadium 50

    Question about getline with fstream

    @yungman, you really should test that the read was successful in your code before going on. It is a very bad habit to assume that a read was successful, especially a read of something expected to be in a certain format, and especially especially if the input was from a person.
  19. Vanadium 50

    What do I need for a home lab?

    Which is it? Or is 14 years old the age of adulthood in Pakistan? If you don't have access to something as innocuous as vinegar, what do you need with a fume hood?
  20. Vanadium 50

    COVID-19 Coronavirus Containment Efforts

    That's an argument that the CDC 0.26% number is wrong. That's a position that's defensible, but should be attacked on it's merits.
  21. Vanadium 50

    COVID-19 Coronavirus Containment Efforts

    The problem with that explanation is that if you make the fatality rate lower, you make the NYC incidence higher and the mismatch between antibody tests and inferred incidence rates gets even more discrepant. So far, I think the following explanations have been suggested: The disease has...
  22. Vanadium 50

    Great one-liners from PF members

    I induce that you have a great capacitance for humor, which I say without reluctance.
  23. Vanadium 50

    I What Mechanism Creates the Jet Emanating From a Quasar?

    f. Nothing to do with magnetic fields or frame dragging or Hawking radiation.
  24. Vanadium 50

    I Asking about Nuclear Magnetic Resonance

    If you don't have a strong background in physics, it will be hard to find something that links two graduate-level topics. @Dr Transport is correct that you don't need QED to explain NMR. I have heard of but am unfamiliar with people using NMR to study the Lamb Shift (a QED effect) in atoms and...
  25. Vanadium 50

    Great one-liners from PF members

    The line I am waiting for a chance to use is "with enough voltage, anything can be a conductor". The opportunity hasn't arisen.
  26. Vanadium 50

    Going into astronomy/astrophysics after EE

    Suppose the answer is yes. What do you plan to do about it? Unless you have access to a time machine, I don't think you have many options. I think your bigger concern is how you plan to "clear" (whatever that means) the GRE without the same physics background as most people. This is easier said...
  27. Vanadium 50

    COVID-19 Coronavirus Containment Efforts

    Where? My quations are number infected = number dead / fatality rate and fraction infected =number infected / total population. number infected = 24000/0.0026 = 9.2M. Do you doubt this? Fraction infected = =number infected / total population = 9.2M/8.4M = 110% Do you doubt this? (The...
  28. Vanadium 50

    I Asking about Nuclear Magnetic Resonance

    What have you already found? Why do you find it unsatisfactory?
  29. Vanadium 50

    COVID-19 Coronavirus Containment Efforts

    That is true. You have my numbers. You can decide which one you think is wrong: the population, the number of deaths, or the fatality rate. If you say, it's the fatality rate, though, be aware that there are 7M positive tests in the US. If you make the fatality rate 4x higher to explain New...
  30. Vanadium 50

    International students may need to leave US if their universities transition to online-only learning

    In the US the fact that a government action affects one negatively is usually not by itself enough to get a judicial ruling in one's favor. One needs to show that the action itself is illegal or improper. If one wants to argue that this - like many things - isn't always done perfectly, I'd...
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