1 Dividing the planet A good globe can set you back quite a lot of money. Of course, I don't mean the little moulded plastic planets or the globes you can blow up as if the world were a beach ball, but the decent sized ones that sit solidly on turned wooden bases and quietly emanate authority from the corner of a room. Yet these days, it hardly seems worthwhile making such an investment. Countries appear to change their colour, their shape or their name with remarkable rapidity. It has become a cliché to po
Acknowledgements Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit. Every effort has
1.1 The WTO The Ministerial Declaration adopted by WTO members at Doha on 14 November 2001 fails to address the most pressing needs either of the poorest countries or of the world's most vulnerable communities. This means that the people who most need a share in global prosperity are still those least likely to obtain it. (A joint statement by Actionaid, CAFOD, Christian Aid, Oxfam, Save the Children and five other charities a 2.1 Learning from video footage You might think that learning from audio-visual sources is very different from learning from written sources yet, somewhat surprisingly, it is much the same. This section of the unit will help you to think about how you can turn the very familiar, but usually passive, process of watching a video into the active process of learning. Watching the video will involve the skills of engaging with the material and making sense of it for yourself, just as if it were written materials. The advantage o 1.6 Defining global markets Global markets for manufactured goods, as opposed to, say, primary commodities such as oil and timber, arose largely in the second half of the twentieth century as trade between countries intensified. The lowering of transport costs and the relative fall in trade barriers enabled firms in one country to compete wit 1.3 Activity 1 Before you read on, I would like you to dwell for just a moment on the significance of this shift from direct investment by Western firms to the establishment of subcontracting ties with overseas partners. Aside from outside References 2.4 Dynamic equilibrium Homeostasis is the term used to describe the dynamic equilibrium that maintains living systems. Homeostasis could be described as the perfect blend of positive and negative feedback cycles in order to maintain living systems. Homeostasis occurs at all levels of organisation within living systems. Individual cells are constantly pumping chemicals across their membranes in order to maintain the appropriate chemical composition for crucial functions such as metabolism and DNA repair 1.3 Activities Activity 4A engages you in developing a more sophisticated visual model of one of the themes raised in the ‘Powerdown Show’ programme. The sign graph diagramming technique is the ultimate visual modelling approach for revealing positive and negative feedback relationships, so you will be using this technique to first explore, and then communicate, the dynamic nature of the complex situation you have chosen to investigate. The first sign graph you will develop will focus on r 1.3 Activities In Activity 3A, you will be exploring your ‘personal ecology’ – the relationship between t 2.6 Mathematical communication When you looked at the title of this reading, did you experience unease? Most people shudder at the thought of dealing with anything mathematical, remembering the torturous lessons at school trying to grapple with calculus, statistics and logic. Yet most of us use mathematical com 1.3 Activities Activity 2A sets the scene by focusing on the ‘big picture’ where you will be asked to choose between four alternative visions of the future. This activity radically shifts the scale of investigation from the personal to the global. However, as with all systems, the emergent behaviour of societ 6.2 Refining the specification The ideas for the boiler cut-out switch can now be based on some real knowledge about temperature effects. You are now ready to tackle the next exercise. List four temperature-dependent changes in material properties t Learning outcomes After studying this unit you should be able to: relate the temperature of a solid to the mean kinetic energy of its atoms; use models for thermally induced effects that involve linear, exponential and step changes; use exponentials, logarithms and graphical methods to interpret data from a thermally activated process in terms of Arrhenius's law; identify the changes of phase taking place in a variety of critical phenomena; 4.1 PROMPT There is so much information available on the internet on every topic imaginable. But how do you know if it is any good? And if you find a lot more information than you really need, how do you decide what to keep and who to discard? In this section we are going to introduce a simple checklist to help you to judge the quality of the information you find. Before we do this, spend a few minutes thinking about what is meant by information quality. 3.5 Images Images can also be found online. Some useful image databases are:
Activity 1
Exercise 7
