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berkeman's Recent Activity

  1. berkeman replied to the thread Hawking radiation.

    Welcome to the PF @Heapum :smile: The New Member Introduction forum is just for brief intro posts, not for questions. And as @phinds...

    Jan 21, 2019 at 2:30 PM
  2. berkeman replied to the thread I Atomic Force Microscopy in hard and soft matter physics.

    Can you post some links to the reading you've been doing about this so far? Thanks. :smile:

    Jan 21, 2019 at 2:13 PM
  3. berkeman liked phinds's post in the thread B A New Way to Make Fusion Reactors More Efficient.

    The topic has been discussed here quite a bit. I suggest a forum search

    Jan 21, 2019 at 12:55 PM
  4. berkeman liked BillTre's post in the thread Stathead Proposed for Baseball Hall of Fame.

    Tired of sports not being intellectual enough for your taste? Bill James, a early leader in the baseball analytics (think Moneyball)...

    Jan 21, 2019 at 12:53 PM
  5. berkeman liked nikosb's post in the thread I Collimating an extended source to infinity?.

    I thought in optics there are two sources, a point source and an extended source. A point source is single point while an extended...

    Jan 21, 2019 at 10:08 AM
  6. berkeman liked fresh_42's post in the thread B Linear combination of functions -- meaning?.

    This is the answer to a question which wasn't posed. Furthermore it is definitely wrong. As you can see, the LHS of ##h(x) = cf(x) +...

    Jan 21, 2019 at 10:06 AM
  7. berkeman liked russ_watters's post in the thread Stargazing Lunar Eclipse Jan 20-21, 2019.

    This is going better than I had hoped. I'm fighting a crazy 35mph wind, but still taking photos up to 1 second exposure. Here's the...

    1213AM.jpg Jan 21, 2019 at 10:04 AM
  8. berkeman replied to the thread I have a beam length question.

    Welcome to the PF. :smile: What is the application? What are the potential consequences of the beam failing?

    Jan 21, 2019 at 9:28 AM
  9. berkeman liked Phylosopher's post in the thread I Expansion and Temperature.

    Can you elaborate?

    Jan 20, 2019 at 8:23 PM
  10. berkeman replied to the thread I Collimating an extended source to infinity?.

    How is a 3cm x 5cm phone LCD display an extended source?

    Jan 20, 2019 at 7:34 PM