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Active layer


Active layer: In environments containing permafrost, the active layer is the top layer of soil that thaws during the summer and freezes again during the autumn. In all climates, whether they contain permafrost or not, the temperature in the lower levels of the soil will remain more stable than that at the surface, where the influence of the ambient temperature is greatest. This means that, over many years, the influence of cooling in winter and heating in summer will decrease as depth increases.

Printed dictionaries and other books with definitions for Active layer

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Google previewPolymer Electronics (2013)

by Mark Geoghegan, Georges Hadziioannou

Optimization of LFET devices is limited with single-layer structures, because that active layer is a balance between good hole and good electron transport, but not optimized for either. For example, the PPV derivative used for the device shown ...

Google previewFundamentals of Materials for Energy and Environmental Sustainability (2011)

by David S. Ginley, David Cahen

The orange and black active layer is a two-phase mixture of a polymeric donor and a fullerene (black phase) acceptor. CIGS, and CdTe to form tandem cells that capture more of the solar spectrum through multijunction structures. This places ...

Google previewThin Film Transistor Technologies (TFTT VII) (2005)

Proceedings of the International Symposium by Yue Kuo

The active layer is an undoped uc-Si film, 200 nm thick, deposited by PECVD.

Google previewEncyclopedia of Environmental Change (2013)

Three Volume Set by John A Matthews

HMF active layer The layer of ground that is subject to annual freezing and thawing in areas underlain by PERMAFROST. The thickness varies from as little as 15 cm in polar regions to over 1.0–1.5 m in SUBARCTIC regions. Thickness ...

Google previewEncyclopedia of Thermal Packaging (2014)

by Avram Bar-Cohen

They are connected via directional edges to the potential TSV nodes in that active layer. If the nets span multiple (more than 2) layers, then the potential TSV nodes in this layer would connect to the potential TSV nodes in the layer just below.

Google previewEncyclopedia of Electrochemical Power Sources (2013)

by Jürgen Garche, Chris K. Dyer, Patrick T. Moseley, Zempachi Ogumi, David A. J. Rand, Bruno Scrosati

Conduction properties differ between the various layers, as the support and diffusion layers are electronic conductors, whereas the active layer, due to the overlapping of electrode and membrane, features two parallel paths for ion and electron ...

Google previewBotany (Collins Internet-Linked Dictionary of) (2017)

by Jill Bailey

active layer in permafrost regions, the part of the surface layer of a soil that thaws out seasonally. This may range from a few ...

Google previewBlackie’s Dictionary of Geography (2000)

by Blackie

active layer In peri-glacial conditions , where permafrost exists...

This upper layer, which is affected by summer thawing and winter freezing, is the active layer. Its lower limit is the permafrost table, ...

Google previewThe Dictionary of Physical Geography (2015)

by David S. G. Thomas

ASG active layer The top layer of ground above the permafrost table that thaws each summer and refreezes each autumn. In temperature terms, it is thelayerthatfluctuatesaboveandbelow0 °Cduring the year. In permafrost areas, seasonally ...

Google previewEncyclopedia of Geography (2010)

by Barney Warf

The active layer provides an extremely important stratum for activities related to regional geomorphology, vegetation, microbes, soil moisture, and soil carbon stocks. Permafrost soils can be quite complex and may vary tremendously through a ...

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