Jerica & Ashleigh
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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

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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
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Acknowledgements

Course image: Adrian S Jones in Flickr made available under Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence.

Grateful acknowledgement is made to the following sources for permission to reproduce material in this course:

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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。
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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
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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.


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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

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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

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

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
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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

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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
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2.3 Exploring for coal

Early miners would have found it easy to trace the distinctive black colour of coal along an outcrop (for example, a coastline or river valley), and surface trenches were used to locate less obvious outcrops. However, tracing an outcrop underground was problematical as the only means of exploration was by digging costly trial shafts. The development of exploratory steam-powered drilling in the early 19th century improved matters, but it was not until the mid- to late- 20th century that more a
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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!


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Martin West Memorial Lecture 2019 - Perspectivism and the Homeric simile - Prof Stephen Halliwell (T
Martin West Memorial Lecture 2019 Martin West Memorial Lecture 2019 - Perspectivism and the Homeric simile - Prof Stephen Halliwell
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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/
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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
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