Catálogo de publicaciones - revistas

<jats:title>Adding autonomy to materials science</jats:title> <jats:p>Shape-memory alloys can alter their shape in response to a change in temperature. This can be thought of as a simple autonomous response, albeit one that is fully programmed at the time of fabrication. It is now possible to build materials or combinations of materials that can sense and respond to their local environment, in ways that might also include simple computations and communication. McEvoy and Correll review recent developments in the creation of autonomous materials. They look at how individual abilities are added to a material and the current limitations in the further development of “robotic materials.”</jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.1261689">10.1126/science.1261689</jats:related-article> </jats:p>

<jats:p>Suppose future governments of the world discover that a single nation is taking the unprecedented action of spraying sulfur dioxide into the stratosphere to cool Earth's surface temperature by a few degrees celsius? The move is intended to increase the fraction of solar energy that is reflected from Earth back into space—a measure known as modifying Earth's albedo. The nation was prompted by a failed harvest the previous year, the result of greenhouse gas buildup in the atmosphere that boosted average summer temperatures above 32°C. National leaders turn to the science community for answers: What does this action mean for any individual country? Will it make the drought in Saõ Paolo better or worse? If the wheat yield falls in northern Russia, could it be due to the albedo modification? Can science apportion damage caused by such an intervention? Should the United Nations block such action?</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>The camel virus appears to be less lethal and more prevalent in humans than assumed.</jats:p>

<jats:p>Better seamount maps could improve tsunami predictions and models of carbon mixing in the deep ocean.</jats:p>