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Napoleon's Bad Example

RealClearScience - 39 min 21 sec ago
Categories: RealClearScience

Wall Crawling With More Accuracy: Van Der Waals Force Re-Measured

Science2.0 - November 26, 2014 - 6:30pm

The van der Waals force, named after Dutch chemist Johannes Diderik van der Waals, is the total forces between molecules not due due to covalent bonds. The famous sticking power of the geckos is thanks to the van der Waals force. 

Although it was discovered in the 19th century, it is still difficult to quantify when predicting the behavior of solids, liquids, and molecules because precise measurements were only possible for single atoms. That won't do for understanding biomolecules and proteins. They are also responsible for the functioning of certain adhesives and are the reason why geckos can adhere so amazingly well to surfaces, even allowing them to climb smooth walls. 


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Categories: Science2.0

Wall Crawling With More Accuracy: Van Der Waals Force Re-Measured

General - November 26, 2014 - 6:30pm

The van der Waals force, named after Dutch chemist Johannes Diderik van der Waals, is the total forces between molecules not due due to covalent bonds. The famous sticking power of the geckos is thanks to the van der Waals force. 

Although it was discovered in the 19th century, it is still difficult to quantify when predicting the behavior of solids, liquids, and molecules because precise measurements were only possible for single atoms. That won't do for understanding biomolecules and proteins. They are also responsible for the functioning of certain adhesives and are the reason why geckos can adhere so amazingly well to surfaces, even allowing them to climb smooth walls. 


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Categories: News

Is The Micropower Revolution Here?

Science2.0 - November 26, 2014 - 5:57pm

Roof-top solar panels are just one part of the micropower revolution. Presidency Maldives, CC BY-NC

By Morgan Saletta, University of Melbourne

There is no shortage of shouting and dire warnings about the state of the climate and our need to phase out fossil fuels. But there is a more silent revolution happening too — in micropower.

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Categories: Science2.0

Is The Micropower Revolution Here?

General - November 26, 2014 - 5:57pm

Roof-top solar panels are just one part of the micropower revolution. Presidency Maldives, CC BY-NC

By Morgan Saletta, University of Melbourne

There is no shortage of shouting and dire warnings about the state of the climate and our need to phase out fossil fuels. But there is a more silent revolution happening too — in micropower.

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Categories: News

A Disturbance In The Force: 'Giant' Charge Density Oscillation Discovered In Nanomaterials

Science2.0 - November 26, 2014 - 5:24pm

In metals like copper and aluminium, conduction electrons move around freely, in the same way as particles in a gas or a liquid.

But when impurities are introduced into the metal's crystal lattice, electrons cluster together in a uniform pattern around the point of interference, resembling the ripples that occur when a stone is thrown into a pool of water. Scientists have now discovered how to strengthen these Friedel oscillations and focus them, almost like using a lens, in different directions.

They've discovered (Nature Communications, DOI: 10.1038/ncomms6558) that at a range of 50 nanometers, these "giant anisotropic charge density oscillations" are many times greater than normal.


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Categories: Science2.0

A Disturbance In The Force: 'Giant' Charge Density Oscillation Discovered In Nanomaterials

General - November 26, 2014 - 5:24pm

In metals like copper and aluminium, conduction electrons move around freely, in the same way as particles in a gas or a liquid.

But when impurities are introduced into the metal's crystal lattice, electrons cluster together in a uniform pattern around the point of interference, resembling the ripples that occur when a stone is thrown into a pool of water. Scientists have now discovered how to strengthen these Friedel oscillations and focus them, almost like using a lens, in different directions.

They've discovered (Nature Communications, DOI: 10.1038/ncomms6558) that at a range of 50 nanometers, these "giant anisotropic charge density oscillations" are many times greater than normal.


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Categories: News

Random Walk Is Similar In Particles, Waves...and Ants

Science2.0 - November 26, 2014 - 4:57pm

In a famous mathematical thought experiment, the goal is to make randomness deterministic by closed-form equation, so mathematicians tried to determine the path of a 'drunken sailor' staggering around a town. 

If there are street lamps, he will run into them, change his direction and keep moving until he gets out of the city. Logically, the time he spends in the area depends on the number of street lamps but the surprising answer is that the number of streetlamps are not the big factor.


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Categories: Science2.0

Random Walk Is Similar In Particles, Waves...and Ants

General - November 26, 2014 - 4:57pm

In a famous mathematical thought experiment, the goal is to make randomness deterministic by closed-form equation, so mathematicians tried to determine the path of a 'drunken sailor' staggering around a town. 

If there are street lamps, he will run into them, change his direction and keep moving until he gets out of the city. Logically, the time he spends in the area depends on the number of street lamps but the surprising answer is that the number of streetlamps are not the big factor.


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Categories: News

Like Collaboration And Intelligence In Humans? Thank War

Science2.0 - November 26, 2014 - 4:32pm

Necessity may be the mother of invention, at least if war is a necessity. And perhaps it is.

In the early days of humanity, survival was a combination of hardiness, keen engineering and intelligence - and nothing spurred on technological progress and vast social changes like the need to work together to kill other people, according to a new paper in Journal of the Royal Society Interface.


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Categories: Science2.0

Like Collaboration And Intelligence In Humans? Thank War

General - November 26, 2014 - 4:32pm

Necessity may be the mother of invention, at least if war is a necessity. And perhaps it is.

In the early days of humanity, survival was a combination of hardiness, keen engineering and intelligence - and nothing spurred on technological progress and vast social changes like the need to work together to kill other people, according to a new paper in Journal of the Royal Society Interface.


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Categories: News

Chronic Pain Isn't All In The Brain

Science2.0 - November 26, 2014 - 1:31pm

It's not in the bones, but it might not be in the brain either. X-ray image by Shutterstock

By Andreas Goebel, University of Liverpool

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Categories: Science2.0

Chronic Pain Isn't All In The Brain

General - November 26, 2014 - 1:31pm

It's not in the bones, but it might not be in the brain either. X-ray image by Shutterstock

By Andreas Goebel, University of Liverpool

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Categories: News

Most Beautiful Math Equation

RealClearScience - November 26, 2014 - 5:00am
Categories: RealClearScience

Rare Black Sea 'Monster'

RealClearScience - November 26, 2014 - 5:00am
Categories: RealClearScience

Russian Cipher Stumped FBI

RealClearScience - November 26, 2014 - 5:00am
Categories: RealClearScience

Saving $766M Worth of Silver

RealClearScience - November 26, 2014 - 5:00am
Categories: RealClearScience