Aug 3, 2018 10:51:26 PM (3 years ago)

finish web tutorials for now

1 edited


  • Tutorials/StackingFaults-I/Stacking Faults-I.htm

    r3081 r3553  
    11311131Simulations – I<o:p></o:p></span></h1>
     1133<P><B>A video version of this tutorial is available at
     1134<A href="https://anl.box.com/v/StackingFaults-I" target="_blank">
    11331137<p class=MsoNormal>In this exercise you will use GSAS-II to simulate the
    11341138diffraction patterns from faulted diamond. Diamond most commonly has the
    13841388<p class=MsoNormal>You can explore the result of various stacking sequences in
    13851389the next block of commands; enter <b><span style='font-family:"Calibri",sans-serif'>1
    1386 1 1 1 2 2 2</span></b> into the box and press <b><span style='font-family:"Calibri",sans-serif'>Enter</span></b>.
     13901 1 1 2 2 2</span></b> into the box (remember to include spaces in between each number) and press <b><span style='font-family:"Calibri",sans-serif'>Enter</span></b>.
    13871391A plot showing the result of a single twin fault will be shown.</p>
    15081512for the <b><span style='font-family:"Calibri",sans-serif'>Histogram scale
    15091513factor</span></b> and change the <b><span style='font-family:"Calibri",sans-serif'>Diffractometer
    1510 type</span></b> to <b><span style='font-family:"Calibri",sans-serif'>Bragg-Brentano</span></b>.
     1514type</span></b> to <b><span
     1515style='font-family:"Calibri",sans-serif'>Bragg-Brentano</span></b> (if
     1516not already set to that).
    15111517Finally, find your phase (<b><span style='font-family:"Calibri",sans-serif'>random
    15121518faults</span></b>) and select it and then the <b><span style='font-family:"Calibri",sans-serif'>Layers</span></b>
    15251531the powder pattern will be displayed with the result. On the plot press the ‘<b><span
    15261532style='font-family:"Calibri",sans-serif'>+</span></b>’ key to suppress the ‘+’
    1527 marks. The plot should look like: I’ve expanded the scale to show the
    1528 interesting stuff around each peak.</p>
     1533marks. The plot should look like: </p>
    15301535<p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape
    15341539</v:shape><![endif]--><![if !vml]><img width=624 height=535
    15351540src="Stacking%20Faults-I_files/image042.gif" v:shapes="Picture_x0020_51"><![endif]></span></p>
     1541(I’ve expanded the scale to show the
     1542interesting stuff around each peak.)
    15371544<p class=MsoNormal>The blue line is a simulated observed pattern with imposed
    15381545Poisson noise, the red line is the calculated background and the green curve is
    15721579as layer 2 to layer 2 at each step in the simulation. We can force this by
    15731580selecting <b><span style='font-family:"Calibri",sans-serif'>Symmetric
    1574 probabilities?</span></b> <span class=GramE>on</span> the Layers page. Do this
     1581probabilities?</span></b> <span class=GramE>on</span> the Layers tab. Do this
    15751582and repeat the sequential simulation as above. Now the matrices are symmetric
    15761583as one could expect. When the simulation is finished, select the <b><span
    18371844"Calibri",sans-serif'>Edit range</span></b> from the data window. Don’t change
    18381845anything, just press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>;
    1839 this will clear the previous simulation. Then return to the clustered phase
     1846this will clear the previous simulation. Then return to the random
     1847faults phase
    18401848Layers tab. Do <b><span style='font-family:"Calibri",sans-serif'>Operations/Simulate
    18411849pattern</span></b> and press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>
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