Neutron-related techniques | Least squares
Rietveld refinement is a technique described by Hugo Rietveld for use in the characterisation of crystalline materials. The neutron and X-ray diffraction of powder samples results in a pattern characterised by reflections (peaks in intensity) at certain positions. The height, width and position of these reflections can be used to determine many aspects of the material's structure. The Rietveld method uses a least squares approach to refine a theoretical line profile until itmatches the measured profile. The introduction of this technique was a significant step forward in thediffraction analysis of powder samples as, unlike other techniques at that time, it was able to deal reliably with strongly overlapping reflections. The method was first implemented in 1967, and reported in 1969 for the diffraction of monochromatic neutrons where the reflection-position is reported in terms of the Bragg angle, 2θ. This terminology will be used here although the technique isequally applicable to alternative scales such as x-ray energy or neutron time-of-flight. The only wavelength and technique independent scale is in reciprocal space units or momentum transfer Q, which is historically rarely used in powder diffraction but very common in all other diffraction and optics techniques. The relation is (Wikipedia).
pyGSAS (GSAS-2) Rietveld Refinement intro tutorial
brief introduction to using free GSAS-II (pygsas) software to do rietveld refinement. For those interested in following along, sample files can be found through this link https://drive.google.com/drive/folders/17ywJW366y3iWpna3tWDzrpEEuFs-SRVv?usp=sharing or emailed upon request if that's
From playlist Software tutorials
New possible quantum spin liquid systems by Avinash Mahajan
Program The 2nd Asia Pacific Workshop on Quantum Magnetism ORGANIZERS: Subhro Bhattacharjee, Gang Chen, Zenji Hiroi, Ying-Jer Kao, SungBin Lee, Arnab Sen and Nic Shannon DATE: 29 November 2018 to 07 December 2018 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Frustrated quantum magne
From playlist The 2nd Asia Pacific Workshop on Quantum Magnetism
Abonniert den Kanal oder unterstützt ihn auf Steady: https://steadyhq.com/en/brightsideofmaths Ihr werdet direkt informiert, wenn ich einen Livestream anbiete. Hier erkläre ich kurz das Riemann-Integral mit Ober- und Untersumme. Die Definition ist übliche, die im 1. Semester eingeführt w
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Integration 1 Riemann Sums Part 1 - YouTube sharing.mov
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What is an enlargement dilation
👉 Learn about dilations. Dilation is the transformation of a shape by a scale factor to produce an image that is similar to the original shape but is different in size from the original shape. A dilation that creates a larger image is called an enlargement or a stretch while a dilation tha
From playlist Transformations
Tutorial showing how to export a Rietveld refinement from GSAS-II (pyGSAS) into QTGrace in order to make nice plots.
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17. Python to make nice figures. Part III: advanced plots
This is part 3 in a 3-part series on making beautiful scientific figures in python. In this video, I will cover some advanced scientific plots in python. Check out part 1 and part 2 if you haven't yet. Part 1: https://youtu.be/rUV8VFbUi_U Part 2: https://youtu.be/Y8JWfGjj2okAll the files
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Alex Martelli at OSCON: Google's Über Tech Lead On Code Revi
Alex Martelli, a well-published Python developer and Google's Über Tech Lead, has some fairly strong convictions about code reviewing, and he's not afraid to share them. Alex believes that there's no enough code reviewing being done in the open source community, and enumerated several of
From playlist OSCON 2008
Understanding and computing the Riemann zeta function
In this video I explain Riemann's zeta function and the Riemann hypothesis. I also implement and algorithm to compute the return values - here's the Python script:https://gist.github.com/Nikolaj-K/996dba1ff1045d767b10d4d07b1b032f
From playlist Programming
A profile of Wim Crouwel: the Dutch graphic designer
"For me it is always a question of thinking before sketching," explains Wim Crouwel, the Dutch graphic designer. "A design ripens in my head, and then I see it more or less in front of me, before I take a pencil and do it on paper". Phaidon.com caught up with Crouwel in Utrecht at Schrö
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Tour Through Yale University Art Gallery - Let Me Know
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From playlist Walter Lewin is Alive and Well!
HAR 2009: (Un)limited design 2/4
Clip 2 Speakers:Adrian Bowyer, Neil Gershenfeld, Ronen Kadushin Open Design (un)limited Design Contest invites anybody -- designers, makers, amateurs -- to submit their own designs in the area of form, fashion and food. Unique about the (un)limited Design Contest is that all des
From playlist Hacking at Random (HAR) 2009
👉 Learn about dilations. Dilation is the transformation of a shape by a scale factor to produce an image that is similar to the original shape but is different in size from the original shape. A dilation that creates a larger image is called an enlargement or a stretch while a dilation tha
From playlist Transformations
Provided to YouTube by DistroKid The Riemann Hypothesis · Humus I Thought You Had a Backup Plan ℗ 973913 Records DK Released on: 2018-10-05 Auto-generated by YouTube.
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RubyConf 2015 - Why is nobody using Refinements? by James Adam
Why is nobody using Refinements? by James Adam Refinements have been a feature in Ruby for several years now, added as a more structured alternative to the "scourge" of monkey patching, but it seems like almost nobody is using them. My question is this: why not? Are they a bad idea? Are t
From playlist RubyConf 2015
Can you evaluate this limit with a sum? Subscribe to my channel: https://youtube.com/drpeyam Check out my TikTok channel: https://www.tiktok.com/@drpeyam Follow me on Instagram: https://www.instagram.com/peyamstagram/ Follow me on Twitter: https://twitter.com/drpeyam Teespring merch: http
From playlist Integrals