Bryan Hanson

Retired academic chemist & freelance R consultant. Also at @[email protected]

[Bryan Hanson @ProfBryanHanson]

@TivadarDanka @threadreaderapp unroll

[Bryan Hanson @ProfBryanHanson]

@TivadarDanka @threadreaderapp unroll

[Bryan Hanson @ProfBryanHanson]

@TivadarDanka @threadreaderapp unroll

[Bryan Hanson @ProfBryanHanson]

@NMRspectroscopy The explanation seems to be for a different set of molecules

[Bryan Hanson @ProfBryanHanson]

@DylanBeaudette “Digital tinnitus “ — excellent turn of phrase!

[Bryan Hanson @ProfBryanHanson]

@NMRspectroscopy I'll go with C. One of the pair of doublets has a smaller coupling constant, so that pair must be environmentally different than the other pair. In B both doublet candidates are adjacent to an N, so they are more alike than those in C.

[Bryan Hanson @ProfBryanHanson]

@NMRspectroscopy Please keep these problems coming, they are great. And please consider also posting on BlueSky, lots of spectroscopists there now.

[Bryan Hanson @ProfBryanHanson]

@NMRspectroscopy No coupling between 9.09 and 8.76? Is there a ~simple explanation for the lack of coupling?

[Bryan Hanson @ProfBryanHanson]

@TuliLab Indeed 2008 was great in Indiana. We are ready to go blue here in Arizona 2024!

[Knowledge & History @xKnowledgeBANK]

Trigonometry in one sheet

[Bryan Hanson @ProfBryanHanson]

@DylanBeaudette @plantbard Thanks!

[Bryan Hanson @ProfBryanHanson]

@plantbard Curious -- which field guide is that?

[Bryan Hanson @ProfBryanHanson]

@RobFathauerArt This fascinates me because in some ways the result (the hat) might have been hidden in plain sight? Of course, one has to be looking for such things...

[Bryan Hanson @ProfBryanHanson]

@RobFathauerArt Sorry, I wasn't clear. I'm asking about what you show in the video, namely that a repeated tiling of 6 kites -> hexagons can be "subsetted" to get to the hat. When was that first observed/reported?

[Bryan Hanson @ProfBryanHanson]

@RobFathauerArt Where was this observation first reported? It's not really discussed in the paper reporting the hat.

[Bryan Hanson @ProfBryanHanson]

@RobFathauerArt Multiple types of symmetry and periodicity somehow give rise to asymmetry and aperiodicity. Going to have to digest this a bit!

[Bryan Hanson @ProfBryanHanson]

@DrEugeniaCheng @skeptomai And here is the final object, courtesy of my grandson!

[Bryan Hanson @ProfBryanHanson]

@DrEugeniaCheng @skeptomai Updated the gist to include code to create a stl file. https://t.co/3Hxbw2aQtf

[Bryan Hanson @ProfBryanHanson]

@DrEugeniaCheng @skeptomai Thanks for catching that! I also lied about using the unit cube... Here's the code I used to generate the coordinates, if you know R. https://t.co/3Hxbw2boiN