منابع مشابه
Hasty retreat of glaciers in northern Patagonia from 1985 to 2011
Mapping changes in glacier extent from repeat optical satellite data has revealed widespread glacier decline in nearly all regions of the world over the past few decades. While numerous studies have documented the changes of the outlet glaciers of the Northern and Southern Patagonia Icefields (NPI/SPI), information about glacier changes in the Patagonian Andes (to the north of the NPI) is much ...
متن کاملRetreat of Chalk cliffs in the eastern English Channel during the last century
The retreat of chalk cliffs fringing the eastern English Channel contributes shingle to the beaches which helps to protect the cliffs and slow down erosion. Conversely, cliff retreat endangers settlements and infrastructure on the clifftop. Rates of retreat have been calculated by a variety of methods over the past century, but no attempt has been made to provide a complete coverage that allows...
متن کاملHasty Congregational Gradient Descent
Stepwise Gradient Descent (SGD) algorithms for online optimization converge to local minima of the relevant cost function. In this paper a globally convergent modification of SGD is proposed, in which several solutions of SGD are run in parallel, together with online estimates of the cost function and its gradient. As each SGD estimate reaches a local minimum of the cost, the fitness of the mem...
متن کاملWalking Atop the Cliffs
Despite a growing body of descriptive, theoretical and practical knowledge about Information Systems Development (ISD), large-scale information system development and implementation projects still fail in high numbers. The deeper causes of such failures are only partially understood. This study uses an action research approach in which prescriptions and recommendations drawn from research on an...
متن کاملSediment dynamics below retreating cliffs
The retreat of cliffs may constitute the dominant erosional response to base‐level fall in arid settings underlain by horizontally‐bedded sedimentary rock. These vertical cliffs typically loom above a relatively straight bedrock slope (‘plinth’) that is mantled with a thin layer of sediment and perched near the angle of repose. In detail, a plinth consists of a system of quasi‐parallel ridges a...
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ژورنال
عنوان ژورنال: Nature
سال: 2016
ISSN: 0028-0836,1476-4687
DOI: 10.1038/539173a