American Geophysical Society Meeting, San Francisco, December 2001
The Sun’s violent outbursts have deep and twisted origins.
The Sun’s violent eruptions of material and magnetic energy have deep and twisted origins, researchers told this week’s American Geophysical Union Meeting in San Francisco, California.
These coronal mass ejections (CMEs) cause the aurora, seen at the Earth’s poles, and can knock out spacecraft. An understanding of what drives CMEs may one da
Mars’ polar ice caps are slowly melting.
The martian ice caps are shrinking. As they are made mostly of frozen carbon dioxide, this evaporation could trigger an increase in Mars’ own greenhouse effect.
Images from the Mars Global Surveyor spacecraft show that ice ridges and escarpments have retreated over the past two years or so. The orbiting probe has also captured the ice thickening and thinning with the passing seasons.
The reason for the change is not yet clea
In any computer’s hard drive, magnetic fields spin electrons this way or that. Now physicists have demonstrated that an electric field can do the same when applied to electrons in semiconductors. And unlike the older magnetic approach, their new device, called a spin gate, is capable of easily imparting a range of spin values. The team’s results, described in a report appearing today in the journal Nature, may one day help to scientists realize the ideal of spintronics—quantum computing based on ele
Astronomers from the University of Pennsylvania, in collaboration with an international team of researchers, have made the first direct detection and measurement of the properties of a dark matter object in the Milky Way.
This observation of a gravitational microlensing event — a temporary increase in the brightness of a background star during the time it takes dark matter to pass in front of it — is reported in today’s issue of Nature.
“By measuring its mass, distance and velocity, w
Bacteria give skin cells their marching orders.
Bacteria that cause potentially lethal ’flesh-eating’ infections make their entrance by telling skin cells to step aside. The bugs hijack the body’s signal for skin cells to become mobile.
Group A streptococci (GAS) normally infect the surface lining of the throat. But occasionally they penetrate skin or the tissues lining the airways, invading deep into the body and causing life-threatening disease.
Finding out how s
A new material helps to make clean fuel from water.
Scientists in Japan have found a more efficient way to extract hydrogen, the ultimate ’green’ fuel, from water. They have developed a material that uses sunlight to break water molecules into their constituent elements of hydrogen and oxygen 1 .
The material is not yet efficient enough to be commercially viable, but its inventors believe that it can be improved. If they are right, hydrogen may soon be on tap
Samples reveal evidence of changes experienced by the surface of asteroid Ryugu, some probably due to micrometeoroid bombardment. Analyzing samples retrieved from the asteroid Ryugu by the Japanese Space Agency’s…
…to control valley polarization in bulk materials. An international team of researchers reports in Nature a new method that achieves valley polarization in centrosymmetric bulk materials in a non-material-specific way…
Ultrafast laser spectroscopy allows the ascertainment of dynamics over extremely short time scales, making it a very useful tool in many scientific and industrial applications. A major disadvantage is the…
Chemical and heat treatment of sewage sludge can recover phosphorus in a process that could help address the problem of diminishing supplies of phosphorus ores. Valuable supplies of phosphorus could…
Some families call it a trial of faith. Others just call it a curse. The progressive neurological disease known as spinocerebellar ataxia 4 (SCA4) is a rare condition, but its…
… and generates six-week antibody response equivalent to standard regimen. Study highlights need for defined markers of mpox immunity to inform public health use. A dose-sparing intradermal mpox vaccination regimen…
Potential alternative to widely used contrast agent gadolinium. Some of the world’s greatest discoveries happened by accident. While the discovery of diamond dust’s potential as a future MRI contrast agent…
Scientists develop novel liquid metal alloy system to synthesize diamond under moderate conditions. Did you know that 99% of synthetic diamonds are currently produced using high-pressure and high-temperature (HPHT) methods?[2]…
Nebraska researcher Eric Markvicka gets NSF CAREER Award to pursue manufacture of novel materials for soft robotics and stretchable electronics. Engineers are increasingly eager to develop robots that mimic the…
Compact, low-power system opens doors for photon-efficient drone and satellite-based environmental monitoring and mapping. Researchers have developed a compact and lightweight single-photon airborne lidar system that can acquire high-resolution 3D…
…for enhanced microscopy analysis. Observing individual cells through microscopes can reveal a range of important cell biological phenomena that frequently play a role in human diseases, but the process of…
… a step towards the computing of the future. An international research team led by scientists from the CNRS1 has discovered that the magnetic nanobubbles2 known as skyrmions can be…