berkeman's latest activity
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berkeman reacted to Paul Colby's post in the thread I How feasible is home radio astronomy? with
Like.
I'd prefer to have some assurances that any bumps measured actually came in through the antenna feed and not some random interference or... -
berkeman reacted to Bandersnatch's post in the thread I Are There Two Suns? Exploring the Phenomenon of Sun Dogs with
Informative.
Looks like 'sun dogs' with the '22° halo'. Maybe the '46° halo' or the 'supralateral arc' as well, seeing how there is a secondary ring... -
berkeman reacted to Dale's post in the thread A three month long summer vacation from public school seems stupid with Informative.
My apologies for using my mentor powers to post after closure, but I thought my experience might be worthwhile on this topic. First...
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berkeman reacted to Baluncore's post in the thread A Reflections at the source point of a transmission line with Like.
Reflections only occur where there is an impedance mismatch. If the source is matched to the line, then there will be no reflection at...
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sorry I didn't know that😅
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berkeman replied to the thread A Science Fanatic.Welcome to PF. :smile: In your future posts, please take care to translate them into English. Thank you. :smile:
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berkeman replied to the thread Hello from a Graduate Aerospace Researcher.Welcome to PF, @arafat :smile: Check out our Mechanical Engineering / Fluids forum and our Aerospace Engineering forum. You should...
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berkeman reacted to arafat's post in the thread Hello from a Graduate Aerospace Researcher with Like.
Hi everyone! I’m Arafat, a graduate researcher, with a focus on hypersonic aerothermodynamics and CFD. I joined PF to learn, exchange...
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berkeman reacted to BillTre's post in the thread Writing: Input Wanted Looking for story advice on ancient aquatic reptile breeding grounds with Informative.
Not entirely clear on what you're after here. Nevertheless you may find some of this useful: Breeding grounds can persist for very...
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berkeman reacted to BillTre's post in the thread Share Animal Pictures: For Animal Lovers with Informative.
This sea slug (like many corals) can use algae they have incorporated into their skin to photosynthesize.
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berkeman replied to the thread Could the Laws of Physics Be Proportional to Entropy?.Thread is closed for Moderation.
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berkeman reacted to jrmichler's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Informative.
You are correct. For moving 4000 lbs, you need some math. Here is how I solve this type of problem. Step 1: Sketch an acceleration -...
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berkeman reacted to Jeremy Sawatzky's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Like.
Thank you very much, that is immensely helpful. I would probably plan for some decent headroom then, putting likely a 2.5 -3kw motor to...
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berkeman reacted to Jeremy Sawatzky's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Like.
Thank you very much. - Post 4 does have some solid math. Unfortunately it is actually not up to me to purchase a gearmotor or servo, I...
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berkeman replied to the thread Writing: Input Wanted Looking for story advice on ancient aquatic reptile breeding grounds.Paging the obvious PF subject matter expert @BillTre (well, at least for current aquatic animals)... :smile: