Earth

WASHINGTON — Nuclear physics is a discovery-driven enterprise aimed at understanding the fundamental nature of visible matter in the universe. For the past hundred years, new knowledge of the nuclear world has also directly benefited society through many innovative applications. In its fourth decadal survey of nuclear physics, the National Research Council outlines the impressive accomplishments of the field in the last decade and recommends a long-term strategy for the future.

Aircraft turbulence guidelines should be rewritten after new research revealed thunderstorms could produce unexpected turbulence more than 100km away from storm cells.

The research by University of Melbourne and the Centre of Excellence for Climate System Science researcher, Dr Todd Lane, has highlighted the impact of atmospheric gravity waves caused by thunderstorms and how air safety guidelines have not taken them into account.

MADISON -- Ice samples pulled from nearly a mile below the surface of Greenland glaciers have long served as a historical thermometer, adding temperature data to studies of the local conditions up to the Northern Hemisphere's climate.

But the method -- comparing the ratio of oxygen isotopes buried as snow fell over millennia -- may not be such a straightforward indicator of air temperature.

Normally a material can be either magnetically or electrically polarized, but not both. Now researchers at the Niels Bohr Institute at the University of Copenhagen have studied a material that is simultaneously magnetically and electrically polarizable. This opens up new possibilities, for example, for sensors in technology of the future. The results have been published in the scientific journal, Nature Materials.

The vagaries of South Asian summer monsoon rainfall impact the lives of more than one billion people. A review in Nature Climate Change (June 24 online issue) of over 100 recent research articles concludes that with continuing rise in CO2 and global warming, the region can expect generally more rainfall, due to the expected increase in atmospheric moisture, as well as more variability in rainfall.

The study is the first to give a comprehensive projection for this long perspective, based on observed sea-level rise over the past millennium, as well as on scenarios for future greenhouse-gas emissions.

"Sea-level rise is a hard to quantify, yet critical risk of climate change," says Michiel Schaeffer of Climate Analytics and Wageningen University, lead author of the study. "Due to the long time it takes for the world's ice and water masses to react to global warming, our emissions today determine sea levels for centuries to come."

CAMBRIDGE, Mass. -- A multidisciplinary team of researchers at MIT and in Spain has found a new mathematical approach to simulating the electronic behavior of noncrystalline materials, which may eventually play an important part in new devices including solar cells, organic LED lights and printable, flexible electronic circuits.

Some Norwegian women with birth anxiety face additional trauma in their meeting with the country's health service, according to research carried out in Stavanger.

The Cesarean section rate is rising in most developed countries and many pregnant women around the world suffer from a fear of childbirth. In Norway, birth anxiety affects one in five pregnant women and can prompt some to demand a Caesarean delivery. But the question is how afraid a woman must be before her wishes are heard.

How much is a stream worth? Can we put a dollar value on a wetland? Some conservation proponents have moved to establish the economic value of "ecosystem services," the benefits that nature provides to people. The approach translates the beauty and utility of a wetland into pounds of phosphorus removed from agricultural runoff, Joules of heat pulled out of urban wastewater, and inches of floodwater absorbed upstream of riverside communities.

A team of researchers from Peking University in Beijing, China, and Duke University in Durham, North Carolina, has demonstrated that carbon nanotube-based integrated circuits can work under a supply voltage much lower than that used in conventional silicon integrated circuits. Low supply voltage circuits produce less heat, which is a key limiting factor for increased circuit density. Carbon-based electronics have attracted attention mostly because of their speed.

ZnSnP2, an absorber material for solar cells, transitions from an ordered to a disordered structure at high temperatures. Researchers from University College London and the University of Bath have proposed taking advantage of this structural change to design high-efficiency solar absorbers. The team used theoretical calculations to investigate the electronic structure of both phases, and predicted a significant difference in the bandgap between the ordered and fully disordered materials.

Sea waves are a renewable and inexhaustible resource found in abundance across the planet. But efficiently converting sea wave motion into electrical energy has been challenging, in part due to the difficulty of compensating for the relatively low speeds and irregular movements of ocean waves. Researchers from the University of Beira Interior in Portugal have designed and simulated a new energy conversion device that addresses both these challenges (i.e., low speed and irregular movements).

Boulder, Colo., USA – New GSA Bulletin postings include studies of the geomorphic impact of 19th-century placer mining along the Fraser River, British Columbia; seafloor images around Ross Island, obtained by the Swedish research vessel Oden from 2007-2011; a foray into the fossil record of early Tertiary mammal evolution in Africa via magnetostratigraphic analyses of exposed fossiliferous sequences in Algeria; and a new contribution to the growing volume of published geoscience research for southeastern Mongolia.

Intense warm climate intervals--warmer than scientists thought possible--have occurred in the Arctic over the past 2.8 million years.

That result comes from the first analyses of the longest sediment cores ever retrieved on land. They were obtained from beneath remote, ice-covered Lake El'gygytgyn (pronounced El'gee-git-gin) ("Lake E") in the northeastern Russian Arctic.

The journal Science published the findings this week.

PHILADELPHIA -- Memory devices for computers require a large collection of components that can switch between two states, which represent the 1's and 0's of binary language. Engineers hope to make next-generation chips with materials that distinguish between these states by physically rearranging their atoms into different phases. Researchers at the University of Pennsylvania have now provided new insight into how this phase change happens, which could help engineers make memory storage devices faster and more efficient.