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.