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127 Aktuelle Fachpublikationen zum Thema temperature

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[Report] Readily processed protonic ceramic fuel cells with high performance at low temperatures

18.09.2015 | Chuancheng Duan; Jianhua Tong; Meng Shang; Stefan Nikodemski; Michael Sanders; Sandrine Ricote; Ali Almansoori; Ryan ..., Science , 2015

Because of the generally lower activation energy associated with proton conduction in oxides compared to oxygen ion conduction, protonic ceramic fuel cells (PCFCs) should be able to operate at lower temperatures than solid oxide fuel cells (250° to 550°C versus ≥600°C) on hydrogen and hydrocarbon ...


[Report] Emergence of room-temperature ferroelectricity at reduced dimensions

18.09.2015 | D. Lee; H. Lu; Y. Gu; S.-Y. Choi; S.-D. Li; S. Ryu; T. R. Paudel; K. Song; E. Mikheev; S. Lee; S. Stemmer; D. A. Ten ..., Science , 2015

The enhancement of the functional properties of materials at reduced dimensions is crucial for continuous advancements in nanoelectronic applications. Here, we report that the scale reduction leads to the emergence of an important functional property, ferroelectricity, challenging the ...


[Policy Forum] Winning coalitions for climate policy

11.09.2015 | Jonas Meckling; Nina Kelsey; Eric Biber; John Zysman, Science , 2015

The gap is wide between the implications of climate science and the achievements of climate policy. Natural sciences tell us with increasing certainty that climate change is real, dangerous, and solvable; social sciences report that key constituencies largely support action. But current and ...


[Report] Highly thermally conductive and mechanically strong graphene fibers

04.09.2015 | Guoqing Xin; Tiankai Yao; Hongtao Sun; Spencer Michael Scott; Dali Shao; Gongkai Wang; Jie Lian, Science , 2015

Graphene, a single layer of carbon atoms bonded in a hexagonal lattice, is the thinnest, strongest, and stiffest known material and an excellent conductor of heat and electricity. However, these superior properties have yet to be realized for graphene-derived macroscopic structures such as ...


[Report] Scalable T2 resistivity in a small single-component Fermi surface

28.08.2015 | Xiao Lin; Benoît Fauqué; Kamran Behnia, Science , 2015

Scattering among electrons generates a distinct contribution to electrical resistivity that follows a quadratic temperature (T) dependence. In strongly correlated electron systems, the prefactor A of this T2 resistivity scales with the magnitude of the electronic specific heat, γ. Here we show ...


[Report] Localization-delocalization transition in the dynamics of dipolar-coupled nuclear spins

21.08.2015 | Gonzalo A. Álvarez; Dieter Suter; Robin Kaiser, Science , 2015

Nonequilibrium dynamics of many-body systems are important in many scientific fields. Here, we report the experimental observation of a phase transition of the quantum coherent dynamics of a three-dimensional many-spin system with dipolar interactions. Using nuclear magnetic resonance (NMR) on a ...


[Perspective] Has there been a hiatus?

14.08.2015 | Kevin E. Trenberth, Science , 2015

Every decade since the 1960s has been warmer than the one before, with 2000 to 2009 by far the warmest decade on record (see the figure). However, the role of human-induced climate change has been discounted by some, owing to a markedly reduced increase in global mean surface temperature (GMST) ...


[Report] Thermal and mechanical properties of the near-surface layers of comet 67P/Churyumov-Gerasimenko

31.07.2015 | T. Spohn; J. Knollenberg; A. J. Ball; M. Banaszkiewicz; J. Benkhoff; M. Grott; J. Grygorczuk; C. Hüttig; A. Hagerman ..., Science , 2015

Thermal and mechanical material properties determine comet evolution and even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface and Sub-Surface Science (MUPUS) instrument package gathered at the Philae ...


[Report] Recent hiatus caused by decadal shift in Indo-Pacific heating

31.07.2015 | Veronica Nieves; Josh K. Willis; William C. Patzert, Science , 2015

Recent modeling studies have proposed different scenarios to explain the slowdown in surface temperature warming in the most recent decade. Some of these studies seem to support the idea of internal variability and/or rearrangement of heat between the surface and the ocean interior. Others ...


[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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