Nov 7, 2014 | No Comments | By Jessica Ader
Professor Marc de Graef of the Department of Materials Science and Engineering at Carnegie Mellon University will visit Johns Hopkins University on Friday November 14, 2014 to present two special events.
The first, “Dynamical Electron Scattering: a Theory and Practice Tutorial,” is a workshop that will begin with an overview of the basic principles of dynamical electron scattering, without necessarily distinguishing between SEM and TEM modalities. He will introduce the geometry of the relevant scattering processes, describe the governing equation and ways to solve it, as well as a stochastic description of inelastic scattering. Then he will apply the theoretical approach to a number of different SEM and TEM modalities: CBED, STEM diffraction contrast imaging, precession electron diffraction, EBSD, electron channeling contrast imaging.
The final part of this presentation will be more hands-on, with explanations and demonstrations of several open source simulations programs. Some basic knowledge of electron microscopy would certainly be helpful. Software is needed to participate in this lecture, so please RSVP using the link below if you are interested in attending.
The second event, “Music by the Numbers: an Attempt to Understand Why Certain Musical Chords Sound Better than Others,” is a special lecture whose goal is to do the following: show that basic musical concepts, such as scales and keys, can be described using simple mathematics, explain basic concepts of keys and triad chords, including why chords are the way they are, and describe a simple model for dissonance and tension, and how these two can be used to model/analyze which chords/chord sequences are preferable to others; this type of modeling is actually not too distinct from interatomic pair potentials. Throughout the talk, de Graef will use a guitar to acoustically illustrate examples and concepts and will also play a few finger-picking pieces along the way. No prior musical knowledge is required nor assumed.