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3.6 Summary

This section has described how fossil fuels provide the majority of the world's energy requirements, with bioenergy, nuclear energy and hydropower also making major contributions. The other 'renewable' energy sources currently supply only a small fraction of world demand, although the contribution of these 'renewables' seems likely to grow rapidly in coming decades, as we shall see in the following section.


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Distinguished Innovator Lecture - Leslie Bottorff
Leslie Bottorff, Partner, Medical Techology, Onset Venture For more information on this series: http://funginstitute.berkeley.edu/programs/distinguished-innovator-lecture-series
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Normal galaxies

Figure 8 shows schematically the broadband spectrum of a normal spiral galaxy. It resembles that of the Sun, although the peak occurs at a slightly longer wavelength and there are relatively greater spectral flux densities at X-ray, infrared and radio wavelengths.

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Ann Cooper Talks School Lunches
19:38 Video Speaking at the 2007 EG conference, "renegade lunch lady" Ann Cooper talks about the coming revolution in the way kids eat at school -- local, sustainable, seasonal and even educational food.
More: http://www.edu-cyberpg.com/NCFR/health.html


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3.4 Radio galaxies

Radio galaxies were discovered accidentally by wartime radar engineers in the 1940s, although it took another decade for them to be properly studied by the new science of radio astronomy. Radio galaxies dominate the sky at radio wavelengths. They show enormous regions of radio emission outside the visible extent of the host galaxy - usually these radio lobes occur in pairs.

The first radio galaxy to be discovered, and still the brightest, is called Cygnus A (Author(s): The Open University

1.5.7 Referencing

We mentioned above that we need to reference sources to ensure we abide by copyright legislation. But there is another reason we need to give accurate references to items we use - so we can share it.

Consider this scenario. A friend says they've just read an interesting article where Joshua Schachter, founder of Delicious has spoken about why it isn't a faceted search system, and you should read it. How would you go about finding it? Would you start looking in a news database, a search
Author(s): The Open University

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Elizabeth Gilbert at TED "Nurturing Creativity"
Excellent video for writers of all ages. It really enforces the importance of hard work and dedication in the arts. Lecture format.

"Elizabeth Gilbert muses on the impossible things we expect from artists and geniuses -- and shares the radical idea that, instead of the rare person "being" a genius, all of us "have" a genius. It's a funny, personal and surprisingly moving talk."
Run time 19:32.

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Computer Basics : How to Change Wallpaper
To create an expanded wallpaper picture for a computer desktop, right click on the desktop, go to "Properties", click on "Desktop" and change the position of the wallpaper to "Stretch". Change computer desktop pictures or photos from the standard centered position with information from a certified computer technician in this video on computer wallpaper.

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7.2 Types of active galaxy

  • All active galaxies have a compact, energetic nucleus - an AGN.

  • Seyfert galaxies are spiral galaxies with bright, point-like nuclei which vary in brightness. They show excesses at far infrared and other wavelengths, and have strong, broad emission lines.

  • Quasars resemble very distant Seyfert galaxies with very luminous nuclei. They are variable. About 10% are strong radio sources thought to be powered by jets of material mo
    Author(s): The Open University

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2.1 Chemical periodicity

The chemistry of the elements is immensely varied. But amidst that variety there are patterns, and the best known and most useful is chemical periodicity: if the elements are laid out in order of atomic number, similar elements occur at regular intervals.

The discovery of chemical periodicity is particularly associated with the nineteenth-century Russian chemist Dmitri Ivanovich Mendeléev (Figure 16). The periodicity is represented graphically by Periodic Tables. Author(s): The Open University

2.1 Planning your search

Your approach to searching will depend to a great extent on what kind of person you are. In an ideal world, when searching for information for a specific purpose, we would all find what exactly we were looking for at the first attempt, especially if we are in a hurry. However, it's always a good idea to have some kind of plan when you are searching for information, if only to help you plan your time and make sure you find the information you need. If I was starting to search for material on h
Author(s): The Open University

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The Plant that Eats Bugs
Learn about the Venus Fly Trap - the carnivorous plant that eats bugs - in this brief, educational video. (00:16)
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2.2.1 Positive integers: denary numbers

The number system which we all use in everyday life is called the denary representation, or sometimes the decimal representation, of numbers. In this system, the ten digits 0 to 9 are used, either singly or in ordered groups. The important point for you to grasp is that when the digits are used in ordered groups, each digit is understood to have a weighting. For example, consider the denary number 549. Here 5 has the weighting of hundreds, 4 has the weighting of tens and
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2.7.4 Identities are contextual and interactional

Different identities assume greater or less importance, and play different roles, in different contexts and settings, and in interactions with different people. Different aspects of people’s identity may come to the fore in the workplace and in the home, for example, while people might emphasise different aspects of themselves to different people (and different people may see different identities when they meet them).


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Cijferend optellen en aftrekken tot 10 000
chalkboard-304221_1280.png

Werkblad waarmee leerlingen het cijferend optellen en aftrekken tot 10 000 (zonder en met ontlening bij 1, 2 of 3 cijfers) inoefenen.


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Singlet Fission II
By: icamp2012school Singlet Fission II Justin Johnson, National Renewable Energy Laboratory
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7.3 The eukaryotic chromosome

Whilst the bulk of eukaryotic DNA is packaged by proteins different from those in the eubacterial chromosome, the principles of bending DNA and neutralising the negative charges in its backbone are shared. Eukaryotic cells have considerably larger genomes than do prokaryotes (in most cases over 1000 times the size of the E. coli genome – see Author(s): The Open University

2.4 Collecting quantitative data

How can you collect quantitative data that summarise the nature of a habitat when it is three-dimensional? How, in fact, do you collect quantitative data?

Multi-storied habitats where the components have a different scale are usually recorded storey by storey, but using much the same methodology. There are two standard ways of collecting data quantitatively. The first involves recording species present within a standard area such as 10 cm × 10 cm, 0.5 m × 0.5 m, 1 m × 1 m, or 10 m ×
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Must-Know Japanese Social Media Phrases #5 - At a Concert
Learn Japanese with JapanesePod101.com! Have you ever wanted to combine your love of learning language with your love of using social media? This series allows you to do just that! You’ll learn more Japanese so you can chat to your Japanese friends online about topics like shopping, going out to dinner, and being on vacation. [...]
Author(s): JapanesePod101.com

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Beethoven (Part 15 of 18)
"Beethoven was a German Composer and pianist.  His music fell in a transitional period between Classical and Romantic music. Beethven studies with Haydn.  Even after his hearing began to deteriorate he still composed, conducted and even performed his music.
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