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2 Geological time-scales – a brief review

Geological time can be divided into a number of Eons, Eras and Periods, with further subdivisions into sub-Periods or series and epochs. These are arranged chronologically, with the oldest at the bottom, younging upwards to form the stratigraphic column (Figure 2).

The stratigraphic column can be looked at in
Author(s): The Open University

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1.2.1 To know or to do?

The so-called ‘content/process’ debate in mathematics involves discussion of the relative importance of content and process in mathematics. It originated as part of a discussion about the nature of mathematics, particularly of school mathematics, and of the purposes for which mathematics is learned. Identifying content and process in mathematics draws attention to the idea that mathematics is a human activity.

As a teacher of mathematics in the UK, you are faced with a national curr
Author(s): The Open University

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2.7.1 Thermosets

There are some limitations to the concept of the repeat unit when applied to crosslinked polymers, the thermosets. This is because of the complexity of the crosslinking reactions, the way molecules link together chemically during thermoset processing. For example, phenolic resins (the basis for materials like Bakelite) are prepared initially as prepolymers, i.e. polymers of low molecular mass (ca. 1000) by reaction between phenol and formaldehyde (
Author(s): The Open University

An optimization method of the facility location by genetic algorithm
In planning of community-facilities, it is important to decide the facility location to provide the effective service for residents. The behavior of residents using the facility and the evaluation methods of the location have been studied. But, finding the optimum location is very hard in actual planning because the volume of calculation depends on the number of feasible locating points of facilities. To conquer the difficulty of searching the optimum location, we propose an optimization method
Author(s): Aoke, Yoshitsugu and Muraoka, Naoto

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1.4.2 P is for Presentation

By presentation, we mean, the way in which the information is communicated. You might want to ask yourself:

  • Is the language clear and easy to understand?

  • Is the information clearly laid out so that it is easy to read?

  • Are the fonts large enough and clear?

  • Are the colours effective? (e.g. white or yellow on black can be difficult to read)

  • If there are graphics or photos, do they help
    Author(s): The Open University

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4.3 Section summary

The modulus function provides us with a measure of distance that turns the set of complex numbers into a metric space in much the same way as does the modulus function defined on R. From the point of view of analysis the importance of this is that we can talk of the closeness of two complex numbers. We can then define the limit of a sequence of complex numbers in a way which is almost identical to the definition of the limit of a real sequence. Another analogue of real analysis arises
Author(s): The Open University

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1.1 1 Why include a global dimension in science education?

Western science drew on a world heritage, on the basis of sharing ideas.

Sen (2002)

The global dimension refers to approaches to education … which focus on global issues, events and interdependence. … pupils will develop … an understanding of different cultural and political perspectives, as well as knowledge of
Author(s): The Open University

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2.3.3 Differences between people and places

I said at the beginning of this section that the average individual and household carbon footprints for a country conceal the differences within that country. These differences in carbon footprints are related to income and can be enormous, but difficult to quantify.

For example, in India the 2004 average carbon footprint of 1.2 tonnes CO2 per person per year hides the differences between: middle-class Indian households living in air-conditioned apartments and owning a televi
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Introduction

This unit takes you on a journey of discovery where you are invited to challenge ideas, both new and old, in relation to mental health. It is made up of a series of three extracts. The first extract, ‘Boundaries of explanation’, sets out the theme of boundaries: boundaries within and between groups; within and between explanatory frameworks; and within and between experiences of mental health and distress. The second extract, ‘Whose risk is it anyway?’, considers a critical account of
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Conclusion

This free course provided an introduction to studying Technology. It took you through a series of exercises designed to develop your approach to study and learning at a distance, and helped to improve your confidence as an independent learner.


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2 The future of wind energy

A great advantage of using wind energy is that, unlike power generation from combustion of fossil fuels, it produces no gas emissions. Even a small 750 kW wind turbine operating with wind speeds just above that of turbine cut-off would reduce annual emissions to the atmosphere by 1200 t of carbon dioxide, 6.9 t of sulphur dioxide and 4.3 t of nitrogen dioxide, compared with the equivalent power output from coal-fired generators. Nevertheless, wind turbines and their infrastructures are substa
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Introduction

There are many compelling reasons for introducing a global dimension in science education. This unit, aimed at teachers in secondary schools explores why the global dimension in science education is so important and how you might incorporate it in your lessons.

This unit is from our archive and is an adapted extract from A global dimension to science education in schools (TL_SCIT5) which is no longer taught by The Open University. If you want to study formally with us, you may wish to e
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Hoe een kledingstuk wassen: Les instructions de lavage
Op het einde van deze les kun je aan de hand van de wasvoorschriften uitleggen hoe een kledingstuk best gewassen wordt.
Author(s): Vlaams Ministerie Van Onderwijs En Vorming

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1 Why sustainable energy matters

One of the greatest challenges facing humanity during the twenty-first century must surely be that of giving everyone on the planet access to safe, clean and sustainable energy supplies.

Throughout history, the use of energy has been central to the functioning and development of human societies. But during the nineteenth and twentieth centuries, humanity learned how to harness the highly-concentrated forms of energy contained within fossil fuels. These provided the power that drove the
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Learning outcomes

  • Objetivos lingüísticos

  • Expresar sus gustos y preferencias en el contexto del arte;

  • Definir términos abstractos, especialmente en el contexto académico;

  • Expresar sentimientos y reacciones hacia acontecimientos específicos;

  • Analizar un cuento.

  • Objetivos culturales

  • Comprender que el significado de las categorías culturales, por ejemplo las de arte y artesanía, pueden variar seg
    Author(s): The Open University

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IPL: Michael Albert "How to shuffle badly"
Professor Michael Albert explains complex permutation work in terms of card shuffles, good and bad. He demonstrates these kinds of good or bad shuffles, explaining how these deliver good or bad randomisation of a deck of cards. This is Professor Albert's inaugural professorial lecture, delivered on the 16th of April 2013.
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3.1 Doctors: the ‘Great-I-Am’

We pin a lot of hopes on doctors. We expect them to know all that is relevant about the classification and treatment of diseases. We expect them to be able to make us better, and to give us an indication of what will happen to us next. There are strong pressures on doctors to respond to this expectation – to be knowledgeable and confident, to set themselves apart from ordinary mortals. Lesley Mackay is a researcher who, in 1989–90, carried out an extensive study involving over a hundred i
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1.2 Boundaries between mental health and illness

Activity 1: What is mental ‘health’?

0 hours 20 minutes

What do you think it means if someone is described as ‘mentally healthy’? Think of all the different ways of descri
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How Does an Electric Circuit Work?
An electric circuit works by using conductors to carry a current
from one place to another after a power supply gives energy to the
current. learn the difference between conductors and insulators, as well as what the best conductors are, with information from a science
teacher in this video.


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3.1 Who will make the decisions?

Where will the decisions be made that will result in meaningful action on climate change, and who will make them stick? Following climate change politics in the media can give the impression that most of the action on climate change is going on between national decision makers in international forums. It is important to keep in mind that these forums have resulted from persistent pressure from a combination of grassroots environmental activists and a global network of science and policy exper
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