8.2 Secondary prevention using drugs Extensive research has been carried out into the use of drugs to help limit damage and minimise deterioration of an established heart or circulatory condition. The use of four main drug categories together reduces the risk of an MI, a stroke or cardiovascular disease death over the next two years by 75 per cent in patients with previous coronary heart disease or stroke (2002 figures from Mackay and Mensah, 2004). Such secondary prevention of cardiovascular diseases has been formalised into a
4.5 What can individuals do? Whatever age they are, men, women and children can all do something to try to prevent future cardiovascular diseases in themselves or their families by eating a balanced diet (see Section 4.6), taking more exercise and modifying their lifestyles to reduce any other known risk factors. If cardiovascular diseases are pre-existi
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: The content ackno
10 Conclusion This unit has introduced you to some aspects of using a scientific or graphics calculator. However, in many ways, it has only scratched the surface. Hopefully your calculator will be your friend throughout your study of mathematics and beyond. Like any friend, you will get to know it better and appreciate its advantages as you become more familiar with it. Don't expect to know everything at the beginning. You may find the instruction booklet, or other help facility, a bit hard going to begin
8.2.6 Information The calculator will give you information about any number that you have entered: for example, its square or cube, its square root or cube root. It will also give you information about a whole list of numbers: for example, the mean (average) or the highest value in the list.
8.2.5 Memory The calculator retains numbers, formulas and programs which you have stored in it, even when it is turned off. You can recall them when you need them and so save time by not having to enter the same information again.
8.2.4 Accuracy The calculator does not make mistakes in the way that human brains tend to. Human fingers do, however, make mistakes sometimes; and the calculator may not be doing what you think you have told it to do. So correcting errors and estimating the approximate size of answers are important skills in double-checking your calculator calculations. (Just as they are for checking calculations done in your head or on paper!)
8.2.2 The screen You can see the calculations that you have entered as well as the answers. This means you can easily check whether you have made any mistakes.
2.4.1 Try some yourself 1 Write the following as a number to a single power: (a) 26 ÷ 22 (b) 1010 ÷ 107 (c) 78 ÷ 74 2.3.1 Try some yourself 1 Write the following as one number to a single power: (a) 23 × 24 (b) 32 × 34 (c) 42 × 43 × 44< Introduction In this unit you will see first how to convert vectors from geometric form, in terms of a magnitude and direction, to component form, and then how conversion in the opposite sense is accomplished. The ability to convert between these different forms of a vector is useful in certain problems involving displacement and velocity, as shown in Section 2, in which you will also work with bearings. This unit is an adapted extract from the Open University course 1.1 Experiences of learning mathematics You will come to this unit with many memories of mathematics, both as a teacher and a learner. It may help if you start by recalling memories of learning mathematics and making a record of them in your notebook. When you work on a task, get into the habit of having your notebook to hand to record your thinking. Use the notebook in any way that helps you to think about the work you have done. Some people find it helpful to divide a page into two columns using the left-hand side to record Acknowledgements The material acknowledged below is Proprietary and used under licence, 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: Figur References 4 The end of the last ice age: the Holocene I have already noted that the great ice sheets took about 100,000 years to form and only about 10,000 years to decay. So what happened at the end of the last ice age? Figure 15 shows the EPICA ice core CO2 concentration and air temperature for the most recent 20 000 years, which is within the last ice Learning outcomes By the end of this unit you should be able to: appreciate how chemical processes in the rest of the world affect the Arctic environment and the species inhabiting it; recognise the physical processes that determine atmosphere and oceanic flows in the Arctic; appreciate the scientific research process and the use of scientific evidence; use quantitative scientific evidence to examine the link between atmospheric carbon dioxide levels a Introduction The scientific theory of plate tectonics suggests that at least some of these Arctic lands were once tropical. Since then the continents have moved and ice has changed the landscape. This unit will concentrate on evidence from the last 800,000 years using information collected from ice cores from Greenland and Antarctica, and will use this evidence to discuss current and possible future climate. The cores show that there have been nine periods in the recent past when large areas of the Earth 4.2 Carbon reduction targets Let's now look at carbon footprint reduction targets in a bit more detail. The first international agreement to set carbon reduction targets was the 1997 United Nations Kyoto Protocol, which requires developed countries to reduce their human-generated greenhouse gas emissions by an average of just over 5% on 1990 levels by 2008 to 2012. By the time the treaty came into force in 2005, only the USA and Australia had refused to sign. (A new Australian government finally signe 4.1 Your carbon footprint Most of this section requires you to continue using the Quick Carbon Calculator (linked in the box below). If you've completed the carbon calculator , you'll have a good idea of your carbon footprint and the relative contribution to the total load made by different components of consumption. You'll also know how your footprint compares to that of an average person in the UK. If you live outside the UK, you may have used a calculator that provides somewhat different information abo 2.2 Records of the Earth's temperature To put the temperature records reported by the IPCC in context, we start with a longer-term geological perspective on the Earth's GMST.
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