2.4 Fuel requirements for nuclear reactors

The fission energy of uranium-235 is 8.2 × 1013 J kg−1. Setting this figure in the context of fuelling a reactor depends on:

  1. The thermal efficiency of the reactor — For modern burner reactors, this is similar to that of modern fossil fuel power stations, about 35% (i.e. 65% of the available energy is lost within the reactor-coolant-turbine system).

  2. The power output — A typical value for a bur
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

1.3 Scales of measurement

In thinking about the sizes of things, it is sometimes useful to do so in quite rough terms, just to the nearest power of ten. For example, 200 is nearer to 100 than it is to 1000, but 850 is nearer to 1000 than it is to 100. So if we were approximating to the nearest power of ten we could say 200 was roughly 102, but 850 was roughly 103. This process is called reducing the numbers to the nearest order of magnitude.

Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Powering the Planet: The Challenge for Science in the 21st Century
The supply of secure, clean, sustainable energy is arguably the most important scientific and technical challenge facing humanity in the 21st century. Rising living standards of a growing world population will cause global energy consumption to increase dramatically over the next half century. Within our lifetimes, energy consumption will increase at least two-fold. This additional energy needed is not attainable from long discussed sources, the global appetite for energy is simply too much. Pet
Author(s): Creator not set

License information
Related content

Rights not set

メモリ割り当ての変更
64ビットアプリケーションであるAfter Effectsのメモリの割り当て方法について学びます。メモリを割り当てる量により、RAMプレビューやレンダリングされるフレームの長さが変わります。
Author(s): No creator set

License information
Related content

Conclusion

  1. Eutrophication is a process in which an ecosystem accumulates mineral nutrients. It can occur naturally, but is usually associated with human activity that releases nutrients into the environment.

  2. Anthropogenic eutrophication has caused a widespread loss of biodiversity in many systems. Recent attempts to reverse the process are proving difficult and expensive.

  3. Symptoms of eutrophication are most readily seen in aquatic systems,
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

4.3 Cellular changes

Hibernation can result in the deposition of fat in adipose tissue. In tissues of finite size which are important sources of energy and sites for fuel metabolism, changes in cell structure (redistribution of organelles involved in energy metabolism and protein synthesis) are the most likely adaptation to a state of torpor. Liver hepatocytes of the hibernating dormouse (Muscardinus avellanarius), are visibly different from those of arousing and euthermic dormice when viewed in thin secti
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Learning outcomes

After studying this course, you should be able to:

  • explain the principles that underlie the ability of wave power to deliver useable energy

  • outline the technologies that are used to harness the power of waves

  • discuss the positive and negative aspects of wave energy in relation to natural and human aspects of the environment.


Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

The Buyback Fund That Gives Back
A buyback fund we launched in 2011 has continued to grow in 2014 and is now open to small investors.
Author(s): Theo Vermaelen and Urs Peyer, INSEAD Professors of

License information
Related content

Rights not set

Virtual Maths - 3D shapes, area of cylinder
Interactive simulation demonstrating the formula and calculation of the area of a cylinder
Author(s): Leeds Metropolitan University

License information
Related content

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

School activities: Evolutionary tree of mammals
This introduction to the evolution of mammals considers Darwin's observations on mammals and how he noticed that species fell into natural groups. This free course, School activities: Evolutionary tree of mammals, looks at evidence from fossils and DNA to examine which mammals are most closely related to whales. First published on Fri, 2
Author(s): Creator not set

License information
Related content

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

The Diversity of Countries and Economies across the World
OpenStax College
By the end of this section, you will be able to: Analyze GDP per capita as a measure of the diversity of international standards of living Identify what classifies a […]

Author(s): No creator set

License information
Related content

4.2 Reactor safety: the Chernobyl incident

By far the worst nuclear reactor accident took place on 26 April 1986 when one of four 1 GW reactors at Chernobyl in the Ukraine released a radioactive cloud over Europe (Figure 17). (See S278 video clips document.) The build-up to this accident has been related to a series of complex chemical reactions induced
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

fcp_27cap
Description not set
Author(s): No creator set

License information
Related content

7.343 A Love-Hate Relationship: Cholesterol in Health and Disease (MIT)
In this class, we will examine cholesterol's role in the cell and in the body as a whole, from its function as a structural component of the membrane to its function in signaling. We will discuss mechanisms of cholesterol sensing, mechanisms of feedback regulation in cells, cholesterol in the brain, cholesterol in the circulation, 'good cholesterol' and 'bad cholesterol,' cholesterol-related human disorders, and the drugs that deal with some of these disorders. This course is one of many Ad
Author(s): Yesilaltay, Ayce

License information
Related content

Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative C

Numbers App for iOS
'Numbers is the most innovative spreadsheet app ever designed for a mobile device. Created exclusively for iPad, iPhone, and iPod touch, Numbers includes support for Multi-Touch gestures and Smart Zoom so you can create powerful spreadsheets using just your fingers.Start with one of over 30 Apple-designed templates for your home budget, checklist, invoice, mortgage calculator, and more. Choose from over 250 powerful functions. Tap to add tables, charts, text, and images anywhere on the free-form
Author(s): No creator set

License information
Related content

Beginner - Poor patient

Some people are so hard up that they can't even afford basic medical care. In today's lesson, you will learn how to take instructions from a doctor and how to ask where to get medicine and food!


Author(s): No creator set

License information
Related content

Mechanism of the Toehold Switch
In this animation, Wyss Institute Postdoctoral Fellow Alex Green, Ph.D., the lead author of "Toehold Switches: De–Novo–Designed Regulators of Gene Expression", narrates a step–by–step guide to the mechanism of the synthetic toehold switch gene regulator. More information: http://wyss.harvard.edu/viewpressrelease/174/
Author(s): No creator set

License information
Related content

4.6 Accretion power

Calculations based on the above accretion disc hypothesis show that if a mass m falls into the black hole, then the amount of energy it can radiate before it finally disappears is about 0.1 mc2, or about 10% of its rest energy. Other than matter-antimatter annihilation, this is the most efficient process for converting mass into energy ever conceived. A comparable figure for the nuclear fusion of hydrogen in stars is only 0.7% of the rest energy of the four hydrogen n
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Conclusion

This free course provided an introduction to studying education. 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.


Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University