John Cuthber
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Everything posted by John Cuthber
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Separating Hydrogen gas into protium and deuterium hydrogen molecules
John Cuthber replied to 3bromopyr's topic in Chemistry
You can buy deuterium depleted water. Which means you start off with 0.0115% deuterium and get 0.00815 % (or 0.01311% if you are trying to concentrate it.) You need a lot of stages to get a good product. -
Because the hole is repairing itself since we stopped using so much CFC. The VLF is not going to make much difference to it.
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Can we PRESERVE and HONOUR our DEAD ? Walker’s Casket !
John Cuthber replied to Commander's topic in Engineering
Just one credit will do; He put the serpent in the garden of Eden and He is therefore solely responsible for everything bad in the world. Think about that... -
Two points. I suggest that you look at them first. and re. "nobody needs data from 30 years ago", ask an historian.
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Good. And at a hundred times the intensity... the plastic melts- which doesn't happen with sunlight, no matter how long you leave it. Accelerated aging tests (often relying on Arrhenius plots) are great, but not infallible. https://en.wikipedia.org/wiki/Arrhenius_plot
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How do they know? 😉
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Synthetics vs natural fibres - odour
John Cuthber replied to StringJunky's topic in Biochemistry and Molecular Biology
I just wish I didn't come across so many people who seem to be engaged on research in this field. -
Could someone give me an appropriate criticism for this?
John Cuthber replied to Abhirao456's topic in Quantum Theory
Slightly less useful; you couldn't even fertilise the rose-beds with it. -
That's interesting. You could say the same of platinum and silver. But their relative cash values change.
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Could someone give me an appropriate criticism for this?
John Cuthber replied to Abhirao456's topic in Quantum Theory
Not that I'm aware of and, if you are writing about something obscure, and fail to explain what it is, then you are writing badly. -
The simple answer is that, according to our experiments, atoms are round. The case for non hydrogen-like atoms is complex, but the simple answer is that the orbitals we get have to be linear combinations of the corresponding orbitals for hydrogen (in order to meet the same momentum + energy criteria). So they look like these https://commons.wikimedia.org/wiki/File:D_orbitals.svg But what is never explained in those diagrams is that the actual sum of the functions is (So I was told as a student) spherically symmetrical.
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If you are going to try to be petty: get it right. It's a strontium ion. " The photo shows a pinprick of a positively charged strontium atom " If it was neutral, it wouldn't be held in an ion trap. Yes they are. Those funny looking dumbbell shapes you see are poor representations of the probability density. The actual functions sum to a spherically symmetrical distribution (unless there's one outside influence on them) But the biggest problem is this If I look at the end of my finger, what I see are photons that were emitted by virtual stated populated from the ground sates by incoming photons. The process is the same- albeit that the energy levels are different.
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Why would an athiest not believe in religion?
John Cuthber replied to dimreepr's topic in General Philosophy
Then I suggest that you get someone else to read your stuff before posting it. That way you might avoid saying things like "I read it twice before reading it ." -
Why would an athiest not believe in religion?
John Cuthber replied to dimreepr's topic in General Philosophy
Did you read that through before you posted it? -
The MSDS lists a couple of strong alkalis as the active ingredients and those will corrode aluminium. (To be fair, so will bleach) The problem is condensation. Have you considered something like this? https://www.selfadhesive.co.uk/tapes/single-sided-tapes/foam-tapes.html
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Am I the only one who read the title of the thread and thought "that's going nowhere fast"? IQ is barely meaningful, race is barely meaningful and brain size is barely relevant.
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Islands of stability in transuranic elements
John Cuthber replied to Moontanman's topic in Speculations
And significant luck. There's no guarantee that they would be fissionable in a bomb. We simply don't know. It's possible that you could have a teeny little nuclear reactor- which would be cute, but utterly impractical. -
If you have symptoms which you think may be due to poisoning you should seek medical treatment. If it turns out not to be poisoning, they still need treating.
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How many "restrooms" does the Whitehouse have?