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5.7.2 Elimination of pathogens through solar disinfection

The lack of safe drinking water in many developing countries has prompted research into simple methods of disinfecting small quantities of water. One such investigation at the University of Beirut in the Lebanon revealed that 99.9% of total bacteria in a water sample could be destroyed by 300 minutes exposure to direct sunlight. In effect this means that if you left a sample of water in a translucent container, a lot of the bacteria in it would be killed.

Research to date has concentrat
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3.3.3 Temperature

All aquatic organisms have a fairly well-defined temperature tolerance range and this determines their distribution. Temperature affects the saturation concentration of dissolved oxygen (as seen in Table 2). An increase in water temperature will reduce the oxygen solubility as well as increase the metabolic activity of aquatic organisms. The combination of these two effects means that oxygen demand by organisms increases just when oxygen supply is being reduced.

Coarse fish such as perc
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1.7 Conclusions

Could both of these students have got more from their involvement with the course if they had taken time to reflect on their goals and their strengths and weaknesses, especially at the beginning of study? Alan, whose reaction to the course was positive, for example, could have learned more about how the course succeeded if he had reflected rather more in the beginning about his initial scepticism and his preference for communicating verbally rather than in writing. What was the reason for his
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1.1 Effective course study

Research into how people study effectively suggests that it is important to pay attention not only to the content of what we are trying to learn but also to the process of our learning. Time spent on the process of how you are learning need not be a distraction from achieving your learning goals. It should support your efforts to achieve them.

However, thinking about the process of your own learning is not something which typically forms part of most formal courses of study. Most people
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1.4 Portraying a character

Activity 7

Click on 'View document' below to read ‘Portraying a character’, which outlines the main methods of revealing character in fiction.

8.4 Hinduism in eastern India: religion in Calcutta

The Hinduism of Bengal, as in other regions of India with their own languages and distinctive historical traditions, has absorbed and retained many local elements which make it peculiarly the Hinduism of Bengal. The city of Calcutta has exerted its own considerable influence upon the surrounding region. Calcutta, the capital of West Bengal, was founded in 1690 originally as a British trading post on the Hugli, a stretch of the Ganges (or Ganga), a river sacred to Hindus (see Author(s): The Open University

6.2 Days and time

The separating out of a special day or time in the week runs in parallel with the marking out of a space that is set aside for worship, ritual and communal activity (material dimension). The place where a religious community gathers speaks powerfully about the convictions shared by its members.

This is nowhere more evident than in the
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5.1 Relativising the Holocaust?

In the wake of the Soviet armies during 1944–45 came police units. In Poland the communist Office of State Security (Urzad Bezpieczerstwa Publicznego, UB) refilled former Nazi camps and prisons with civilians, many of whom were Germans innocent of any offence other than that of being German. Somewhere between 60,000 and 80,000 died as a result of UB behaviour in the camps and prisons; victims were beaten, tortured, starved, killed. One of the only researched UB units is that which op
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1.3 The historical study of cuneiform

Now, how did historical study reach the stage where Neugebauer and Sachs could pick up a tablet in a library and translate it so as to provide a fair degree of understanding? As with Egyptian hieroglyphs, cuneiform studies date from the last century. Their equivalent of the Rosetta Stone—a trilingual inscription for which one of the languages could be partially understood—was a sheer rock-face at Behistun in south-western Iran into which a text was carved in three languages, Old Persian,
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Introduction

This unit is from our archive and it is an adapted extract from Topics in the history of mathematics (MA290) which is no longer in presentation. If you wish to study formally at The Open University, you may wish to explore the courses we offer in this curriculum area.

This unit looks at Babylonian mathematics. You will learn how a series of discov
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6 Conclusion

William Wilberforce died on 29 July 1833, two days after hearing that the legislation for the abolition of slavery in British dominions had successfully completed its passage through the House of Commons, a fitting conclusion to the work he had begun nearly half a century before.

The Practical View both reflected and contributed to a major shift in religious consciousness of which the continuing growth of the Evangelical movement was the most striking manifestation. Methodist num
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Acknowledgements

This unit was written by Dr Alex Barber

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
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References

Boswell, J. (1971) Boswell in Extremes: The Private Papers of James Boswell, 1776–1778, ed. C. McC. Weis and F.A. Pottle, London, Heinemann.
Boswell, J. (1986) The Life of Samuel Johnson, ed. C. Hibbert, Harmondsworth, Penguin (first published 1791).
Butlin, M. (1983) William Blake, London, Tate Gallery.
Clayt
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1 Prelude: Hume's death

In mid-August 1776 crowds formed outside the family home of David Hume. Hume was a pivotal figure in the Scottish Enlightenment, and his imminent death was widely anticipated. The crowds were anxious to know how he was facing up to his coming demise.

Hume is best known today as a historian (through his History of England of 1754–62) and a philosopher. His Treatise of Human Nature is regarded by many as one of the most significant philosophical works to have been written
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5.1 Revolutionary calendar and metric system

We considered earlier the universalist principles of 1789 deriving from the Enlightenment that inspired the Declaration of the Rights of Man and the redivision of France into departments. As the dominant group in the Convention by 1793, the Jacobins regarded themselves as mandated to enact the ‘general will’ of the people in a sense inspired by Rousseau: not as the aggregate weight of the individual aspirations of 28 million Frenchmen, but as the expression of that which, as virtuous men
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4.1 Intellectual, governmental and monarchical responses

There was much sympathy among intellectuals abroad for the Revolution, which seemed to be putting so many Enlightenment ideals into practice. The German philosopher Immanuel Kant was among the first to hail the Revolution as a unique historical phenomenon, and these early reactions were shared by Fichte, Herder, Schiller and Goethe. Enthusiasts in Britain included the radical Thomas Paine, author of The Rights of Man (1791), Mary Wollstonecraft, author of A Vindication of the Rights
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4.5.2 ‘Ganymed’ (‘Ganymede’)

‘Ganymed’ is another through-composed setting of a poem inspired by ancient Greek mythology. Ganymede was a boy of exceptional beauty, and Goethe's poem describes the feelings of the young lad as he is transported up to heaven by Zeus to become cup-bearer to the gods.

Like ‘Prometheus’, this is a freely written poem, with no consistency in the length of lines nor any formal metrical scheme. There is only one rhyme (‘Nachtigall’ and ‘Nebeltal’ in lines 18–19), and there
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Introduction

This unit asks what it is to be a person. You will see that there are several philosophical questions around the nature of personhood. Here we explore what it is that defines the concept. As you work through the unit, you will notice that this area of enquiry has developed its own semi-technical vocabulary. The plural of ‘person’ is, in this area of enquiry, ‘persons’ rather than ‘people’. It is easy to see the reason for this. The question ‘What are people?’ is potentially c
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4.2 Parts of speech

In describing the grammar of written Latin, the best method is to use the traditional classical grammar, as worked out by the Greeks and Romans themselves. As a preliminary, it may be useful to learn the ‘parts of speech’ in English. A very brief explanation follows, and then a much fuller discussion.

Part of speech Explanation
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2.3.1 Politics

MacLean was a socialist from the age of twelve, and a Marxist by the late 1930s, when he believed that the Soviet Union and the Red Army were the only agents that could defeat Fascism. However, he never joined the Communist Party, and by 1944 events in Poland had thoroughly disillusioned him about Stalin and the Soviet Union. One reason why he could never commit himself fully to Communism seems quite clear: he retained from his Calvinist heritage a deep pessimism about human nature and human
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