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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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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

1.2 Earthquakes and volcanoes

The disasters that first come to mind are those where the earth itself changes in an unpredictable and sudden way:

  • earthquakes

  • volcanic eruptions

  • tidal waves

These natural phenomena are now known to be interconnected: earthquakes result from vast plates of the earth's crust meeting and moving against one another. Volcanic explosions, such as Krakatoa (1883) and Mount St Helens (1980) are also manifestations
Author(s): The Open University

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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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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

Philip Howard, "The Rule of Nobody"
The secret to good government is a question no one in Washington is asking: "What's the right thing to do?" What's wrong in Washington is deeper than you think. Yes, there's gridlock, polarization, and self-dealing. But hidden underneath is something bigger and more destructive. It's a broken governing system. From that comes wasteful government, rising debt, failing schools, expensive health care, and economic hardship. Rules have replaced leadership in America. Bureaucracy, regulation, and
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2 The biology of prions

The increasing interest in kuru during the 1950s and 1960s had the effect of stimulating research into TSEs in humans and other animals.

Question 6

Summarise, in general terms, the possible causes of disease in animals.
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2.9 Summary

In this section, I started by emphasising the fact that the computer, which has become more or less omnipresent in modern society, is a tool like any other.

I went on to look at the special nature of that tool, establishing that its function is to capture, store, present, exchange and manipulate interesting aspects of the world.

I then introduced the idea of two contrasting realms: the analogue world we inhabit and the digital interior world of the computer. When we capture featur
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Richmond on Broad Café
Located within the University of Richmond Downtown, Richmond on Broad Café is open to the community, serving breakfast, lunch, and mid-afternoon refreshments. Operated by University of Richmond's Dining Services , the café offers a dynamic menu of made-to-order fare supported by local and regional products. Bettie Clarke, Executive Director of Campus Dining, and Matt Lee, Chef and Manager of Richmond on Broad, took a few moments to share their vision.
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Online teaching: introduction to the collection
Online teaching: introduction to the collection
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8.3 Actividad

Actividad 8.3

In this activity you are going to find out about another interesting hotel, this time in Santiago de Cuba, which overlooks the house of Diego Velázquez, the first Spanish governor of Cuba.

DIEGO VEL
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1.1.5 Clearing the previous calculation

To clear the previous calculation, click the 'C' button.

Provided that no operation has been performed on an entered number, an incorrect entry can be deleted one digit at a time by clicking the 'Backspace' button. (This is labelled 'Back' on some versions of the Windows calculator.)


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FOAMCARP closed cell aluminium foam
Additions such as SiC are made to molten aluminium or aluminium alloy to modify the melt viscosity and make it suitable for foaming. Calcium carbonate is then added to the melt which is solidified to form a precursor which can be foamed in a controlled manner by a subsequent heat treatment. The resulting foam has a fine and relatively uniform cell structure.
Author(s): DoITPoMS, University of Cambridge,D C Curran, Depa

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

Sherpa community mourns for those killed in Everest's avalanche
Subscribe: http://smarturl.it/reuterssubscribe Nepalese march in honor of the Sherpas who were killed in Friday's avalance on Mount Everest. Nathan Frandino reports. Subscribe: http://smarturl.it/reuterssubscribe More Breaking News: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial, national, and international news.
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2.4 The slippery language of ‘family’

Most fundamentally, however, we need to understand how language is used, and what ‘work’ it does as we interact with others in our everyday lives. As the sociologist and philosopher, Alfred Schutz (1954) argued, it is important to pay careful attention to the relationship between sociological and everyday concepts, since everyday concepts express the meanings by which social interactions are framed. So how do people themselves understand, encounter, interpret and evoke the very slippery c
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Writers reading: favourite books

Authors: 
Michiel Heyns, Finuala Dowling, Imraan Coovadia, Yewande Omotoso, Henrietta Rose-Innes