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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 previewFundamentals of Materials for Energy and Environmental Sustainability (2012)

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 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 previewEncyclopedia of Electrochemical Power Sources (2013)

by 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 previewEncyclopedia of Soil Science (2006)

by R. Lal

These soils are very often saturated because the active layer (the upper layer of the soil that freezes and thaws annually) is shallow.

Google previewA Dictionary of Geography (2015)

by Susan Mayhew

active layer A highly mobile layer, periodically thawing, located above the *permafrost in *tundra regions, and ranging in depth from a few centimetres to 3 m. Its thickness depends on slope angle and aspect, ...

Google previewConcise Encyclopedia of Semiconducting Materials & Related Technologies (2013)

by S. Mahajan, L. C. Kimerling

n – InGaAsP active layer (-lum) n- InP buffer layer (-5um) n- InP substrate -350mm thick Figure 3 Schematic of a multilayer structure used in the fabrication of light-emitting devices based ...

Google previewThe Facts on File Dictionary of Weather and Climate (2009)

by Jacqueline Smith

active layer The upper surface ...

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 previewDictionary Of Civil Engineering (1992)

by John S. Scott

active layer horizontal push from earth on to a wall. The active earth force from sand on to a free retaining wall is equivalent to that from a fluid of density 0.25 to 0.30 times that of the sand. The force from sand on to a fixed retaining wall is very ...

Google previewDictionary of Landscape Architecture and Construction (2005)

by Alan Christensen

active layer The surface layer in climates where ...


by McGraw-Hill Education

{'ak-tiv im'yii-nat-é} active layer [GEOL] That part of the soil which is within the suprapermafrost layer and which usually freezes in winter and thaws in summer Also known as frost zone. { 'ak~tiv 'la-ar} active permafrost [GEOL] Permanently ...

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