Squeaky Sand on the Friendly Beach

Squeaky Sand on the Friendly Beach

The white sands of Friendly Beach, Tasmania, Tasmania, squeak under every step. The sand is nearly pure silica, originating in quartz-baring rocks, eroded into sand, compacted into sandstone, and re-eroded into fine, smooth, rounded grains. The black rock shore platforms are part of an extensive dolerite formation dating to the breakup of Gondwanaland. The dolerite is weathering into tiles with a honeycomb texture.

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One Response to Squeaky Sand on the Friendly Beach

  1. DP says:

    Hey, I didn’t realize from Joe’s blog you were the one who puts the equations up on the boards for Stargate. (I’m the one who stated a smaller mesh size isn’t the answer to everything.)

    Did you do the one for Prodigy? I caught the mistake on the board before it was pointed out to Carter. I made the exact same mistake before.

    I now PdL said on the commentary that someone just intentionally switched the numerator and denominator, but one of my solutions to a system of DiffEqs wasn’t making sense and I skimmed my equations and found an equation where the denominator was problematic in the exact same way (possible to have zero values when plugging in practical numbers).

    I could see right away somehow my numerator and denominator got switched. You know how it is when you’ve seen the same forms for solutions over and over – you know what it should generally look like. I recrunched the equations and the exponent stayed the same.

    So, the moral of the story is that the simple swap of numerator and denominator is a mistake that could plausibly carry over into practical problems (spinning disk stresses, in this case, but I even had RsubB and RsubA labelled the same way in my mistake) even though PdL was scoffing about it being a “forced” mistake.

    Anyway, I really should say something relevant to your blog entry, seeing as I am a materials scientist by training, but I tried to imagine a mapping of reciprocal space for a silicate once without a proper understanding of space groups and my head almost exploded. I’m sorry, I’m getting emotional just thinking about it.

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