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984 Aktuelle Fachpublikationen zum Thema temperature

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[Report] The weakening summer circulation in the Northern Hemisphere mid-latitudes

17.04.2015 | Dim Coumou; Jascha Lehmann; Johanna Beckmann, Science , 2015

Rapid warming in the Arctic could influence mid-latitude circulation by reducing the poleward temperature gradient. The largest changes are generally expected in autumn or winter, but whether significant changes have occurred is debated. Here we report significant weakening of summer circulation ...

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Spatial versus Day-To-Day Within-Lake Variability in Tropical Floodplain Lake CH 4 Emissions – Developing Optimized Approaches to Representative Flux Measurements

10.04.2015 | Roberta B. Peixoto et al., PLoS ONE, 2015

by Roberta B. Peixoto, Fausto Machado-Silva, Humberto Marotta, Alex Enrich-Prast, David Bastviken Inland waters (lakes, rivers and reservoirs) are now understood to contribute large amounts of methane (CH4) to the atmosphere. However, fluxes are poorly constrained and there is a need for ...

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[Report] Eddy-driven subduction exports particulate organic carbon from the spring bloom

10.04.2015 | Melissa M. Omand; Eric A. D’Asaro; Craig M. Lee; Mary Jane Perry; Nathan Briggs; Ivona Cetinić; Amala Mahadevan, Science , 2015

The export of particulate organic carbon (POC) from the surface ocean to depth is traditionally ascribed to sinking. Here, we show that a dynamic eddying flow field subducts surface water with high concentrations of nonsinking POC. Autonomous observations made by gliders during the North Atlantic ...

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[Report] Molecular nitrogen in comet 67P/Churyumov-Gerasimenko indicates a low formation temperature

10.04.2015 | M. Rubin; K. Altwegg; H. Balsiger; A. Bar-Nun; J.-J. Berthelier; A. Bieler; P. Bochsler; C. Briois; U. Calmonte; M. ..., Science , 2015

Molecular nitrogen (N2) is thought to have been the most abundant form of nitrogen in the protosolar nebula. It is the main N-bearing molecule in the atmospheres of Pluto and Triton and probably the main nitrogen reservoir from which the giant planets formed. Yet in comets, often considered the ...

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Energies, Vol. 8, Pages 2701-2713: Melting Behavior and Thermolysis of NaBH4−Mg(BH4)2 and NaBH4−Ca(BH4)2 Composites

08.04.2015 | Ley, Morten B.; Roedern, Elsa ; Thygesen, Peter M. M.; Jensen, Torben R., Energies, 2015

The physical properties and the hydrogen release of NaBH4–Mg(BH4)2 and NaBH4−Ca(BH4)2 composites are investigated using in situ synchrotron radiation powder X-ray diffraction, thermal analysis and temperature programmed photographic analysis. The composite, xNaBH4–(1 − x)Mg(BH4)2, x = 0.4 to ...

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Reply to Liu et al.: Loss of TGF-{beta} signaling in CARASIL pathogenesis [Biological Sciences]

07.04.2015 | Nathalie Beaufort; Eva Scharrer; Vanda Lux; Michael Ehrmann; Christof Haffner; Martin Dichgans, Proceedings of the National Academy of Sciences current issue, 2015

We thank Liu et al. (1) for their comments on our work on the link between the cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL)-related protease high temperature requirement protein A1 (HtrA1) and the TGF-β signaling pathway. To advance our ...

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Loss of HtrA1-induced attenuation of TGF-{beta} signaling in fibroblasts might not be the main mechanism of CARASIL pathogenesis [Biological Sciences]

07.04.2015 | Ju Liu; Fengyun Dong; Josephine Hoh, Proceedings of the National Academy of Sciences current issue, 2015

In their contribution to PNAS, Beaufort et al. demonstrate that high temperature requirement protein A1 (HtrA1) facilitates TGF-β signaling through processing latent TGF-β binding protein 1 (LTBP-1) (1). Then the authors suggest the down-regulation of TGF-β signaling by lack of HtrA1-mediated ...

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[Report] Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics

03.04.2015 | Sang Il Kim; Kyu Hyoung Lee; Hyeon A Mun; Hyun Sik Kim; Sung Woo Hwang; Jong Wook Roh; Dae Jin Yang; Weon Ho Shin; X ..., Science , 2015

The widespread use of thermoelectric technology is constrained by a relatively low conversion efficiency of the bulk alloys, which is evaluated in terms of a dimensionless figure of merit (zT). The zT of bulk alloys can be improved by reducing lattice thermal conductivity through grain boundary ...

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[Report] Mechanisms of antiwear tribofilm growth revealed in situ by single-asperity sliding contacts

03.04.2015 | N. N. Gosvami; J. A. Bares; F. Mangolini; A. R. Konicek; D. G. Yablon; R. W. Carpick, Science , 2015

Zinc dialkyldithiophosphates (ZDDPs) form antiwear tribofilms at sliding interfaces and are widely used as additives in automotive lubricants. The mechanisms governing the tribofilm growth are not well understood, which limits the development of replacements that offer better performance and are ...

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[Perspective] Tracking antiwear film formation

03.04.2015 | Udo D. Schwarz, Science , 2015

Lubrication has been practiced since the early days of human civilization (1); for example, heavy objects were moved more easily on wooden or stone floors by spreading water onto the surface. In the early 20th century, the advent of the internal combustion engine and its long periods of operation ...

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