Earth

New research at King's College London may lead to improved solar cells and LED-displays. Researchers from the Biophysics and Nanotechnology Group at King's, led by Professor Anatoly Zayats in the department of Physics have demonstrated in detail how to separate colours and create 'rainbows' using nanoscale structures on a metal surface. The research is published in Nature's Scientific Reports.

The flooding in New York and New Jersey caused by Superstorm Sandy prompted calls from Gov. Andrew Cuomo and other officials to consider building storm surge barriers to protect Lower Manhattan from future catastrophes. But, such a strategy could make things even worse for outlying areas that were hit hard by the hurricane, such as Staten Island, the New Jersey Shore and Long Island's South Shore, a City College of New York landscape architecture professor warns.

"Who in his wildest dreams could have imagined that, beneath the crust of our Earth, there could exist a real ocean...a sea that has given shelter to species unknown?"

So wrote Jules Verne almost 150 years ago in A Journey to the Center of the Earth. Verne probably couldn't have imagined the diversity of life that researchers observe today under the ocean floor.

Philadelphia, Pa. (November 19, 2012) – Portable bed rails marketed to "make any bed safer" actually increase the risk of injury and death, according to an article in the November 15 issue of Biomedical Safety & Standards (BS&S).

Hydrogen, the lightest element, can easily dissolve and migrate within metals to make these otherwise ductile materials brittle and substantially more prone to failures.

"Our analysis shows that the Norse in Greenland ate lots of food from the sea, especially seals," says Jan Heinemeier, Institute of Physics and Astronomy, Aarhus University.

"Even though the Norse are traditionally thought of as farmers, they adapted quickly to the Arctic environment and the unique hunting opportunities. During the period they were in Greenland, the Norse ate gradually more seals. By the 14th century, seals made up between 50 and 80 per cent of their diet."

This study uses high-resolution, two-dimensional seismic reflection data, collected by ION Geophysical Corporation as part of the BeaufortSPAN East survey, to examine the seismic stratigraphy and sedimentary architecture of a 1000-km-long section of the Beaufort Sea margin.

The climate of Central America is influenced by changing conditions in both the North Atlantic region and the tropical Pacific Ocean, and how these systems have varied in the past to affect precipitation patterns in the tropics is poorly understood.

Our ability to predict future changes in water resource availability requires a longer-term perspective based on the geologic record. In this paper, Nathan D. Stansell and colleagues analyze lake sediments from Nicaragua for their oxygen isotopic composition in order to infer past changes precipitation during the last ~1,400 years.

A video explaining the fragility of the welfare state.

(Photo Credit: UC3M)

Source: Carlos III University of Madrid

Mosquitos have the remarkable ability to fly in clear skies as well as in rain, shrugging off impacts from raindrops more than 50 times their body mass. But just like modern aircraft, mosquitos also are grounded when the fog thickens. Researchers from the Georgia Institute of Technology present their findings at the 65th meeting of the American Physical Society's (APS) Division of Fluid Dynamics, Nov. 18 - 20, in San Diego, Calif.

Owls have the uncanny ability to fly silently, relying on specialized plumage to reduce noise so they can hunt in acoustic stealth. Researchers from the University of Cambridge, England, are studying the owl's wing structure to better understand how it mitigates noise so they can apply that information to the design of conventional aircraft. They present their findings at the American Physical Society's (APS) Division of Fluid Dynamics meeting, held Nov. 18 – 20, in San Diego, Calif.

Sound waves are commonly used in applications ranging from ultrasound imaging to hyperthermia therapy, in which high temperatures are induced, for example, in tumors to destroy them. In 2010, researchers at Caltech led by Chiara Daraio, a professor of aeronautics and applied physics, developed a nonlinear acoustic lens that can focus high-amplitude pressure pulses into compact "sound bullets." In that initial work, the scientists demonstrated how sound bullets form in solids. Now, they have done themselves one better, creating a device that can form and control those bullets in water.

Scientists at the University of Southampton are pioneering a technique to predict when an ecosystem is likely to collapse, which may also have potential for foretelling crises in agriculture, fisheries or even social systems.

The researchers have applied a mathematical model to a real world situation, the environmental collapse of a lake in China, to help prove a theory which suggests an ecosystem 'flickers', or fluctuates dramatically between healthy and unhealthy states, shortly before its eventual collapse.

Time marches relentlessly forward for you and me; watch a movie in reverse, and you'll quickly see something is amiss. But from the point of view of a single, isolated particle, the passage of time looks the same in either direction. For instance, a movie of two particles scattering off of each other would look just as sensible in reverse – a concept known as time reversal symmetry.

Now the BaBar experiment at the Department of Energy's (DOE) SLAC National Accelerator Laboratory has made the first direct observation of a long-theorized exception to this rule.

One important process by which a continent can grow over geologic time is when the erosion of high mountain belts in the continental interior sheds large volumes of rock debris, which is carried away by rivers and eventually fills in adjacent ocean basins.

An unusually vigorous episode of such growth occurred from 53 to 40 million years ago in the northwestern United States. Over that time period, intense mountain uplifts and volcanic eruptions occurred in the Challis volcanic province in central Idaho.