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4.3.1 Initiation

Initiation is the mechanism which starts the polymerization process. Vinyl monomers are quite easily polymerized by a variety of activating methods. Styrene, for example, can be converted to solid polymer simply by heating, and ultraviolet light can have exactly the same effect. Usually, however, an activating agent is used. This is an unstable chemical which produces active species that attack the monomer. A good example is benzoyl peroxide which splits up when heated:

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2.1 Jupiter and its missions: an update

Jupiter's visibly flattened shape is a result of the planet's rapid rotation. The flattening is not really apparent in Figure 9.1, because the terminator (the day-night boundary) is within the left-hand edge of the visible half of the globe. The flattened shape is better seen in Author(s): The Open University

Introduction

From the moment that Galileo dropped two cannonballs of different sizes and weights from the top of the Leaning Tower of Pisa mankind has been fascinated by the impact of gravity. This unit looks at gravity, its impact on objects and how the energy involved in the movement of objects is dispersed or stored.

This unit is from our archive and is an adapted extract from How the universe works (S197) which is no longer taught by The Open University. If you want to study formally with us, yo
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3.2.1 What is the difference between government and governance?

Governance is from the Greek words kybenan and kybernetes, meaning ‘to steer’ and ‘pilot’ or ‘helmsman’. It is the process whereby ‘an organization or a society steers itself, and the dynamics of communication and control are central to the process’ (Rosenau and Durfee, 1995, p. 14). Of course, you could read these words as a pretty sound definition of government but that would be missing the point. Government describes a more rigid and narrower set
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7.3 Summary of Section 7

  • The historian Linda Colley locates the birth of ‘Britain’ after 1707. She mentions three main factors that contributed to establishing the British nation: war, religion and the prospect of material advantage.

  • The creation of the UK was not free from conflict, resistance, war and military intervention.

  • The British Empire generated a unique opportunity for most UK nations to participate and enjoy some of the benefits it brough
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4.2 Altruism

How is it possible then to sustain groups in which some individuals are prevented from breeding? They would have no lifetime reproductive success, none of their characteristics could be passed on to offspring.

SAQ 17

Name
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Introducing professional practice
This series of tracks looks at several aspects of health work including child protection services, hospitals and mental health providers with an aim to explaining everyday practices and ideas for the future. Material is taken from The Open University course K114 Introducing professional practice. The iTunes U team.
First published on Tue, 13 Apr 201

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Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

1.3.2 Recurrent themes

When the accounts of people who have described a near-death experience are looked at side by side it is possible to identify some common features. This isn’t to say that all of these features are present in every account, but that amidst variations there are certainly recurrent themes. The following list is compiled from a variety of studies, including the important study undertaken by Sabom (1982), himself initially sceptical.


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Literary Festival 2016: Progress in Troubled Times: learning from "The Age of Genius" [Audio]
Speaker(s): Professor AC Grayling | What happened to the European mind between 1605, when an audience watching Macbeth at the Globe might believe that regicide was such an aberration of the natural order that ghosts could burst from the ground, and 1649, when a large crowd, perhaps including some who had seen Macbeth forty-four years earlier, could stand and watch the execution of a king? Or consider the difference between a magus casting a star chart and the day in 1639, when Jonathan Horrock a
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References

Birkett, D. (2001) ‘The school we'd like’, The Guardian, 5 June 2001. Available from: http://education.guardian.co.uk/schools/story/0,5500,501374,00.html [Accessed 23 November 2003].
Brown, P. (2001) ‘The erosion of geography’, The Guardian, 20 November 2001. Available from: www.education.guardian.co.uk/schools/story/0,5500,597485,00.html [Accessed 20 November 2003].
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4.4 Using information

Our use of information is often biased in important regards. First, we pay more attention to information that is easily available (the availability heuristic). Second, we overweight memories which are more easily retrievable – usually because they are emotionally vivid or have personal relevance (the retrievability heuristic).

We pay selective attention to information, often in a self-serving way. We will often give greater weight to information which shows us in a favou
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to choose from on a range of subjects. 

Find out more
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6.1 Defining amplitude

Another important property of a sine wave we need to be able to specify is its amplitude. In essence, the amplitude of a sine wave is its size. Unfortunately there are various ways of defining what is meant by the size of a sine wave, and you are likely to come across many of them in material you look at outside this unit. Before I explain what our definition is, it will help matters if we look at what is meant by the average value of a sine wave.

Figure 16 shows a sinusoidally a
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3.1 Introduction

The main role of glucose within the body is as a fuel but it also contributes to the fabric (tissue) by attaching to proteins. In people without diabetes, the blood glucose levels are kept within very narrow limits. The body does not allow them to become too high or too low. Several parts of the body are involved in this process. Some are large, for example the liver, and some are very small, such as the cells within the pancreas. Cells are small building blocks of the body and cannot
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2.3 What is an informal carer?

Lynne is a daughter and a sister. Is she also an informal carer?

Audio: click below to listen to the case study on 'Caring in Familes'

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MEPO 3/374 - ALFRED SOLOMON charged with the wilful murder of BARNET BLITZ (Image 7)

The National Archives UK posted a photo:

MEPO 3/374 - ALFRED SOLOMON charged with the wilful murder of BARNET BLITZ (Image 7)

Correspondence fro
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8.3 Synthesis of information

The synthesis needs to show you can:

  • evaluate and synthesise information and present sources correctly;

  • identify the various arguments and present your interpretation in a way that brings together information in a coherent way;

  • prepare an oral presentation for delivery and be prepared to lead a discussion of it.

Your presentation and discussion needs to show you can:

    <
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Study another free course

There are more than 800 courses on OpenLearn for you t
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Committees and the Iron Triangle
The committee system dominates the House of Representatives. It is within committees that much of the daily work of the House is completed. Committees meet to discuss specific policies, work to control the congressional agenda, and guide legislation as it progresses through Congress until it is either signed or vetoed by the president. Representatives can be members of several different committees during any given session. (Video is narrated with slides and speeches.)

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Jonzen - female nude OP32775

*

Festival of Britain 1951. Lambeth, London. A sculpture of a female nude by Karin Jonzen, located at the end of Waterways, South Bank Exhibition site. Photographed in August 1951.
© Historic England


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