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118 Aktuelle Fachpublikationen zum Thema temperature

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[Perspective] Magnetic bubbles with a twist

17.07.2015 | Kirsten von Bergmann, Science , 2015

Present-day hard disk drives use magnetic bits that are read out by movable read heads. To circumvent the inherent fragility of such a mechanical construction, and to exploit the third dimension for increased storage density, Parkin et al. proposed a racetrack memory device (1). The general ...

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[Report] Keeping cool: Enhanced optical reflection and radiative heat dissipation in Saharan silver ants

17.07.2015 | Norman Nan Shi; Cheng-Chia Tsai; Fernando Camino; Gary D. Bernard; Nanfang Yu; Rüdiger Wehner, Science , 2015

Saharan silver ants, Cataglyphis bombycina, forage under extreme temperature conditions in the African desert. We show that the ants’ conspicuous silvery appearance is created by a dense array of triangular hairs with two thermoregulatory effects. They enhance not only the reflectivity of the ...

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[Report] Summer declines in activity and body temperature offer polar bears limited energy savings

17.07.2015 | J. P. Whiteman; H. J. Harlow; G. M. Durner; R. Anderson-Sprecher; S. E. Albeke; E. V. Regehr; S. C. Amstrup; M. Ben- ..., Science , 2015

Polar bears (Ursus maritimus) summer on the sea ice or, where it melts, on shore. Although the physiology of “ice” bears in summer is unknown, “shore” bears purportedly minimize energy losses by entering a hibernation-like state when deprived of food. Such a strategy could partially compensate ...

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[Review] Contrasting futures for ocean and society from different anthropogenic CO2 emissions scenarios

03.07.2015 | J.-P. Gattuso; A. Magnan; R. Billé; W. W. L. Cheung; E. L. Howes; F. Joos; D. Allemand; L. Bopp; S. R. Cooley; C. M. ..., Science , 2015

The ocean moderates anthropogenic climate change at the cost of profound alterations of its physics, chemistry, ecology, and services. Here, we evaluate and compare the risks of impacts on marine and coastal ecosystems—and the goods and services they provide—for growing cumulative carbon ...

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[Report] Possible artifacts of data biases in the recent global surface warming hiatus

26.06.2015 | Thomas R. Karl; Anthony Arguez; Boyin Huang; Jay H. Lawrimore; James R. McMahon; Matthew J. Menne; Thomas C. Peterso ..., Science , 2015

Much study has been devoted to the possible causes of an apparent decrease in the upward trend of global surface temperatures since 1998, a phenomenon that has been dubbed the global warming “hiatus.” Here, we present an updated global surface temperature analysis that reveals that global trends ...

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[Report] Topological defect dynamics in operando battery nanoparticles

19.06.2015 | A. Ulvestad; A. Singer; J. N. Clark; H. M. Cho; J. W. Kim; R. Harder; J. Maser; Y. S. Meng; O. G. Shpyrko, Science , 2015

Topological defects can markedly alter nanomaterial properties. This presents opportunities for “defect engineering,” where desired functionalities are generated through defect manipulation. However, imaging defects in working devices with nanoscale resolution remains elusive. We report ...

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[In Depth] The return of Philae

19.06.2015 | Eric Hand; Daniel Clery, Science , 2015

The Philae comet lander has woken up from a 7-month slumber; now the European Space Agency is trying to communicate with it and get it to embark on new experiments. Following an awkward landing in a heavily shadowed area on comet 67P/Churyumov-Gerasimenko in November, Philae's batteries quickly ...

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[Perspective] Can climate feel the pressure?

12.06.2015 | Daniel J. Peppe; Dana L. Royer, Science , 2015

Atmospheric carbon dioxide (CO2) concentrations are widely held to be the main driver of climate change through the Phanerozoic (the past 541 million years), with warm intervals corresponding to high CO2 concentrations and cold intervals having low CO2 concentrations (1) (see the figure). ...

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[Report] Long-term climate forcing by atmospheric oxygen concentrations

12.06.2015 | Christopher J. Poulsen; Clay Tabor; Joseph D. White, Science , 2015

The percentage of oxygen in Earth’s atmosphere varied between 10% and 35% throughout the Phanerozoic. These changes have been linked to the evolution, radiation, and size of animals but have not been considered to affect climate. We conducted simulations showing that modulation of the partial ...

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[In Depth] Lost and found: Earth's missing heat

05.06.2015 | Carolyn Gramling, Science , 2015

What if the missing heat has been there all along? In 2013, the Intergovernmental Panel on Climate Change flagged an odd phenomenon: Atmospheric temperature data collected over the past few decades suggested that global warming had slowed down beginning around 1998. Global warming skeptics ...

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