Workshop 3
Use of English for professional teaching Сегодня: четверг,
27 февраля 2020 г.
Associated Professor of National Research Tomsk Polytechnic University, Kuprekova E.I.
Atomic Scale Structure of
Materials and Symmetry
Home Task
1. Make an introduction to your presentation of a device or an object
2. Know, understand and explain similarities and differences between
Crystalline and amorphous materials General types of crystal packing General kind of defects Differences between gases, solids and
liquids 3. Знать элементы симметрии (плоскость,
ось, инверсия,…)
Part 1. Let’s get started
How often do you give presentations in your life?
Who or what do you normally present to?
When was the last time you gave presentation in English?
How do you feel about presenting in a foreign language?
Was it success? If yes, why? If not, why not? Explain your answer
Introduction
• Tell the audience what are you going to say
Main part
• Say it!
Conclusion
•Tell them what you said!
The structure of presentation
Welcome audience
Introduce yourself
Say what the topic is
Explain why audience will be interested
Introduction
There are several ways you can tell the audience what you are going to say.
Would like + infinitive • Today I’d like to tell you about
our new plans. • This morning I’d like to bring
you up to date on our University
Will + infinitive • I’ll began by explaining the
function. • I’ll start off by reviewing our
progress. • After that, I’ll move on to the
next point.
Going to + infinitive • I’m going to talk to you about
new developments. • This afternoon I’m going to be
reporting on the new University
Will be + Ving • I’ll be talking about our new
guidelines for Internet use. • During the next hour we’ll be
looking at the advantages of this system
Welcome audience
Introduce yourself
Say what the topic is
Explain why audience will be interested
semiconductors superconductivity
Liquid crystals
diffraction X-ray diffraction
Introduction
Optical Fibers Polymers
corrosion
Metals
Glasses
Composites
Part 3. Atomic Structure of Materials
The fundamental difference is ….
polycrystalline single crystal amorphous
Single crystals 1. What is the anisotropy of the crystal?
2. What is the difference between glass and crystal?
3. Describe the structure of the metal crystalline lattice?
4. Give the definition of a polyhedron and a list its elements
5. Какие предметы называются симметричными?
Polycrystals
A polycrystalline solid is made up of many crystals.
The properties of polycrystals are notably different from those of a single
crystals. The individual component crystallites are
grains and grain boundaries The size of a grain varies according to the conditions
under which it formed.
The grain boundaries are high-energy features, similar to the surfaces between bubbles.
Let’s look
• https://serc.carleton.edu/NAGTWorkshops/mineralogy/xtlsymmetry/elements.html
• http://symmetry.otterbein.edu/gallery/index.html
• http://crystallographiccourseware.com
• http://crystallographiccourseware.com/PlaneGroupSymmetry/PlaneGroupSymmetryElements.html
Summary
The focus is the difference between single crystals, polycrystals and amorphous solids:
• single crystals are periodic across their entire volume;
• polycrystals are periodic across individual grains;
• amorphous solids have no periodicity at all.
• A single crystal may exhibit anisotropy.
• Polycrystals may also be anisotropic within each grain.
• Amorphous solids are isotropic on the atomic scale.
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