berkeman's latest activity
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berkeman reacted to .Scott's post in the thread Need advice and hints for working with helium with
Informative.
Especially in contrast to Hydrogen, Helium is very inert - it is the most inert element. It's two electrons exactly fill the 1s2 shell... -
berkeman reacted to SootySnow's post in the thread Admissions Graduating a year early anxieties + grad school with
Like.
Well said. For a long time, I've had this perception of success that's defined in magnitude rather than direction. Going into college... -
Hi I'm Connor, and I've been really interested in science when I was a kid and when I needed some evidence for a project at my college...
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berkeman reacted to Baluncore's post in the thread Simple transmitter-receiver device like Smarttag with Like.
Ask the teacher/supervisor to enable a smartphone, so other children can use the same Samsung Smarttag2 system reliably.
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How about this one: in Harahan, LA. I think they re-constructed Dickory since I lived there. I remember my GPS used to say, take...
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berkeman replied to the thread How to build a CNC plotter?.What's a "t dvd drive"? And what kind of motors/encoders are you getting? Stepper motors with end-stop detection, or servo motors?
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berkeman replied to the thread Undergrad Why is thermal energy treated differently than other kinds of energy?.(Thread discussion level changed from Graduate to Undergraduate, based on the OP's background.)
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berkeman replied to the thread How to build a CNC plotter?.So for an x-y plotter, you have two main ways to move the pen. The first uses a moving x-arm and a way to move the pen along that arm...
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berkeman replied to the thread Undergrad The missing 3D magnetism theory.(Thread discussion level changed from Graduate to Undergraduate based on the OP's background.)
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berkeman replied to the thread How to build a CNC plotter?.If you are making 2-D drawings, why do you need 3-axis motor movement? If you need to just lift the pen in the 3rd dimension, you can...
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berkeman reacted to FactChecker's post in the thread Undergrad What is the most impactful way of introducing Laplace transforms? with Like.
Aero engineers in flight control design or stability and control use it heavily.
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This bodes well for life surviving in space. Kinda crazy how bacteria and viruses evolved to be more resilient in low gravity conditions.
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Thank you so much Greg! Again, please don't worry. It could have been some occasional glitch, not worth losing time over it. Let's see...
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Frost on a windowpane: Nikon D810 + 55mm MicroNikkor + M2 extender w/ focus set at 1:1 reproduction ratio, 1/60s f/8 +2.7 EV, auto...
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Photo of me after a four mile run at minus 32 deg F this morning. Frosty on the outside, warm on the inside. The ice buildup on my...
