segunda-feira, 30 de março de 2015

What courses cost | News | Times Higher Education

What courses cost | News | Times Higher Education:

Infographic (26 March 2015)

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Mobile students get top marks | News | Times Higher Education

Mobile students get top marks | News | Times Higher Education:

Small infographic (19 March 2015)

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Science policies laid out ahead of general election | News | Times Higher Education

Science policies laid out ahead of general election | News | Times Higher Education:

Houses of Parliament, London, England

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Universities at risk of falling short on investment | News | Times Higher Education

Universities at risk of falling short on investment | News | Times Higher Education:

Growing money plant

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Does the sector need a ‘teaching REF’? | News | Times Higher Education

Does the sector need a ‘teaching REF’? | News | Times Higher Education:

Male chef holding chicken by legs

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Stefan Grimm’s death leads Imperial to review performance metrics | News | Times Higher Education

Stefan Grimm’s death leads Imperial to review performance metrics | News | Times Higher Education:

Imperial College London campus sign

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Winners and losers in Hefce funding allocations | News | Times Higher Education

Winners and losers in Hefce funding allocations | News | Times Higher Education:

Who fared best and worst

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Special reports | The Economist - Universities: Excellence v equity

Special reports | The Economist:


Universities
Mar 28th 2015
The American model of higher education is spreading. It is good at producing excellence, but needs to get better at providing access to decent education at a reasonable cost, says Emma Duncan




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sábado, 28 de março de 2015

How an ancient Muslim scientist cast his light into the 21st century | Elsevier Connect

How an ancient Muslim scientist cast his light into the 21st century | Elsevier Connect:

Ibn al-Haytham's sketch of the human optical system. The oldest known drawing of the nervous system from Kitab al-Manazir of Ibn al-Haytham (from a manuscript held in the Süleymaniye Library, Istanbul), in which the eyes and optic nerves are illustrated. It shows a large nose at the bottom, eyes on both side and a hollow optic nerve that flows out of each one towards the back of the brain. (Source: <a href="http://www.muslimheritage.com/article/reflections-optics-time">Reflections on the Optics of Time</a>  © Muslim Heritage)

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Watch: Man takes selfie every mile of 2,600 mile hike, creates amazing timelapse video - Weird News - News - The Independent

Watch: Man takes selfie every mile of 2,600 mile hike, creates amazing timelapse video - Weird News - News - The Independent:



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Dad eats daughter's weed brownies, thinks he's had a stroke - Americas - World - The Independent

Dad eats daughter's weed brownies, thinks he's had a stroke - Americas - World - The Independent:



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A terrifying example of how distracted some teenagers get when they're driving

A terrifying example of how distracted some teenagers get when they're driving:

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Finland schools: Subjects scrapped and replaced with 'topics' as country reforms its education system - Europe - World - The Independent

Finland schools: Subjects scrapped and replaced with 'topics' as country reforms its education system - Europe - World - The Independent: "With Finland radically reforming the way its children are taught, Richard Garner visits Helsinki to find out if the teachers approve"



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It was America's bloodiest war, and now, it's in color. Watch Blood and Glory: The Civil War in Color on April 7th.

The Honourable Schoolboy

It was America's bloodiest war, and now, it's in color. Watch Blood and Glory: The Civil War in Color on April 7th.

History Channel

6 Explorers Who Disappeared — HISTORY Lists

6 Explorers Who Disappeared — HISTORY Lists:

Gaspar and Miguel Corte-Real

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sexta-feira, 27 de março de 2015

plus.maths.org

plus.maths.org:

Home

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String theory: From Newton to Einstein and beyond | plus.maths.org

String theory: From Newton to Einstein and beyond | plus.maths.org:

A string universe. Image &copy; R. Dijkgraaf.

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What is cosmology? | plus.maths.org

What is cosmology? | plus.maths.org:

David Mulryne

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Life after the Higgs boson | plus.maths.org

Life after the Higgs boson | plus.maths.org:

CMS decay into 2 photons

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APOD: 2015 March 26 - Orion Spring

APOD: 2015 March 26 - Orion Spring: "As spring comes to planet Earth's northern hemisphere, familiar winter constellation Orion sets in early evening skies and budding trees frame the Hunter's stars. The yellowish hue of cool red supergiant Alpha Orionis, the great star Betelgeuse, mingles with the branches at the top of this colorful skyscape. Orion's alpha star is joined on the far right by Alpha Tauri. Also known as Aldebaran and also a giant star cooler than the Sun, it shines with a yellow light at the head of Taurus, the Bull. Contrasting blue supergiant Rigel, Beta Orionis, is Orion's other dominant star though, and marks the Hunter's foot below center. Of course, the sword of Orion hangs from the Hunter's three blue belt stars near picture center, but the middle star in the sword is not a star at all. A slightly fuzzy pinkish glow hints at its true nature, a nearby stellar nursery visible to the unaided eye known as the Orion Nebula."

See Explanation.  Clicking on the picture will download
 the highest resolution version available.

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Problemas de memória? Coma chocolate

Problemas de memória? Coma chocolate:

Problemas de memória? Coma chocolate

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terça-feira, 24 de março de 2015

Barcelona Research and Innovation Map

Barcelona Research and Innovation Map:

barcelonactiva

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UK unveils national strategy for stimulating growth in quantum technologies - physicsworld.com

UK unveils national strategy for stimulating growth in quantum technologies - physicsworld.com:

Photograph of the UK universities, science and cities minister, Greg Clark (left), and Kai Bongs of the University of Birmingham, with quantum-optical equipment

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Physics Madness: The Supersymmetric Sixteen | symmetry magazine

Physics Madness: The Supersymmetric Sixteen | symmetry magazine:



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Physics Reports | Vol 574, Pgs 1-36, (16 April 2015) | ScienceDirect.com

Physics Reports | Vol 574, Pgs 1-36, (16 April 2015) | ScienceDirect.com:

Cover image Physics Reports

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IMPLICAÇÕES METEOROLÓGICAS DO ECLIPSE SOLAR DE 20 DE MARÇO DE 2015

Instituto Português do Mar e da Atmosfera:

IMPLICAÇÕES METEOROLÓGICAS DO ECLIPSE SOLAR DE 20 DE MARÇO DE 2015

Eclipse solar 20-03-2015

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segunda-feira, 23 de março de 2015

V - A + F = 2, a fórmula de Euler para os poliedros - PÚBLICO

V - A + F = 2, a fórmula de Euler para os poliedros - PÚBLICO:



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Lee Kuan Yew's Singapore may be autocratic but at least the escalators work | The Sunday Times

Lee Kuan Yew's Singapore may be autocratic but at least the escalators work | The Sunday Times:



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The Old Boys: The Decline and Rise of the Public School by David Turner | The Sunday Times

The Old Boys: The Decline and Rise of the Public School by David Turner | The Sunday Times:

Brighter futures: Eton boys in the historic School Yard

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APOD: 2015 March 22 - A Double Eclipse of the Sun

APOD: 2015 March 22 - A Double Eclipse of the Sun:

See Explanation.  Clicking on the picture will download
 the highest resolution version available.

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133º Aniversário de Emmy Noether



http://en.wikipedia.org/wiki/Emmy_Noether

Outstanding. Brilliant.

Maths & Physics, viz.

Physics[edit]

Noether was brought to Göttingen in 1915 by David Hilbert and Felix Klein, who wanted her expertise in invariant theory to help them in understanding general relativity, a geometrical theory of gravitation developed mainly by Albert Einstein. Hilbert had observed that the conservation of energy seemed to be violated in general relativity, due to the fact that gravitational energy could itself gravitate. Noether provided the resolution of this paradox, and a fundamental tool of modern theoretical physics, with Noether's first theorem, which she proved in 1915, but did not publish until 1918.[102] She not only solved the problem for general relativity, but also determined the conserved quantities for every system of physical laws that possesses some continuous symmetry.
Upon receiving her work, Einstein wrote to Hilbert: "Yesterday I received from Miss Noether a very interesting paper on invariants. I'm impressed that such things can be understood in such a general way. The old guard at Göttingen should take some lessons from Miss Noether! She seems to know her stuff."[103]
For illustration, if a physical system behaves the same, regardless of how it is oriented in space, the physical laws that govern it are rotationally symmetric; from this symmetry, Noether's theorem shows the angular momentum of the system must be conserved.[104]The physical system itself need not be symmetric; a jagged asteroid tumbling in space conserves angular momentum despite its asymmetry. Rather, the symmetry of the physical laws governing the system is responsible for the conservation law. As another example, if a physical experiment has the same outcome at any place and at any time, then its laws are symmetric under continuous translations in space and time; by Noether's theorem, these symmetries account for the conservation laws of linear momentum andenergy within this system, respectively.
Noether's theorem has become a fundamental tool of modern theoretical physics, both because of the insight it gives into conservation laws, and also, as a practical calculation tool.[4] Her theorem allows researchers to determine the conserved quantities from the observed symmetries of a physical system. Conversely, it facilitates the description of a physical system based on classes of hypothetical physical laws. For illustration, suppose that a new physical phenomenon is discovered. Noether's theorem provides a test for theoretical models of the phenomenon: if the theory has a continuous symmetry, then Noether's theorem guarantees that the theory has a conserved quantity, and for the theory to be correct, this conservation must be observable in experiments.