An extensive area of horizontal convective rolls (also known as ‘cloud streets’) over the Brest Peninsula, northwest France

Weather ◽  
2019 ◽  
Vol 74 (7) ◽  
pp. E3-E3
Keyword(s):  
Extensive Area ◽  
Convective Rolls

Selection of convective rolls in a thin evaporating-fluid layer in an air flow

2008 ◽  
Vol 43 (1) ◽  
pp. 49-58
Author(s):  
V. P. Reutov ◽  
G. V. Rybushkina
Keyword(s):  
Fluid Layer ◽  
Air Flow ◽  
Convective Rolls ◽  
Selection Of

scholarly journals Time-Dependent Diffusion Coefficients for Chaotic Advection due to Fluctuations of Convective Rolls

Fluids ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 99 ◽  
Author(s):  
Kazuma Yamanaka ◽  
Takayuki Narumi ◽  
Megumi Hashiguchi ◽  
Hirotaka Okabe ◽  
Kazuhiro Hara ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Liquid Crystals ◽  
Diffusion Coefficients ◽  
Coarse Graining ◽  
Chaotic Advection ◽  
Time Dependent ◽  
Local Order ◽  
Weak Turbulence ◽  
Normal Diffusion ◽  
Convective Rolls

The properties of chaotic advection arising from defect turbulence, that is, weak turbulence in the electroconvection of nematic liquid crystals, were experimentally investigated. Defect turbulence is a phenomenon in which fluctuations of convective rolls arise and are globally disturbed while maintaining convective rolls locally. The time-dependent diffusion coefficient, as measured from the motion of a tagged particle driven by the turbulence, was used to clarify the dependence of the type of diffusion on coarse-graining time. The results showed that, as coarse-graining time increases, the type of diffusion changes from superdiffusion → subdiffusion → normal diffusion. The change in diffusive properties over the observed timescale reflects the coexistence of local order and global disorder in the defect turbulence.

scholarly journals Observations on a Debris-Covered Polar Glacier “Whisky Glacier”, James Ross Island, Antarctic Peninsula, Antarctica

1987 ◽  
Vol 33 (115) ◽  
pp. 300-310 ◽  
Author(s):  
T.J.H. Chinn ◽  
A. Dillon
Keyword(s):  
Antarctic Peninsula ◽  
Rock Glacier ◽  
Freezing Front ◽  
Extensive Area ◽  
Free Zone ◽  
Rock Glaciers ◽  
James Ross Island ◽  
Polythermal Glacier ◽  
Powerful Mechanism

Abstract“Whisky Glacier” on James Ross Island, Antarctic Peninsula, comprises anévéand clean ice trunk surrounded by an extensive area of debris-covered ice resembling a rock glacier. The debris-free trunk of the glacier abuts abruptly against the broad, totally debris-covered tongue at a number of concentric zones where debris-laden beds crop out at the surface in a manner similar to the “inner moraine” formations of many polar glaciers.Ice structures and foliation suggest that “Whisky Glacier” is a polythermal glacier which is wet-based under the debris-free zone, and dry-based under the debris-covered zone. It is surmised that the glacier sole crosses the freezing front close to where the basal debris beds are upwarped towards the surface. Here, basal water is confined, and freezes to the under side of the glacier in thick beds of regelation ice which are uplifted to the surface along with the debris-laden beds. Ablation losses effectively cease beneath the blanket of debris covering the tongue.The transition from wet-based to dry-based conditions at the glacier sole is a powerful mechanism for entraining debris into a glacier and, in the case of “Whisky Glacier”, for lifting debris to the surface. It is suggested that this may be a mechanism for forming some polar rock glaciers.

scholarly journals Evidence of convective rolls in a sunspot penumbra

2008 ◽  
Vol 488 (2) ◽  
pp. L17-L20 ◽  
Author(s):  
V. Zakharov ◽  
J. Hirzberger ◽  
T. L. Riethmüller ◽  
S. K. Solanki ◽  
P. Kobel
Keyword(s):  
Sunspot Penumbra ◽  
Convective Rolls

The Pershore Hoards and Votive Deposition in the Iron Age

2013 ◽  
Vol 79 ◽  
pp. 297-325 ◽  
Author(s):  
Derek Hurst ◽  
Ian Leins
Keyword(s):  
Iron Age ◽  
Roman Period ◽  
Geophysical Survey ◽  
Landscape Position ◽  
Small Scale ◽  
Archaeological Excavation ◽  
Extensive Area ◽  
Late Iron Age ◽  
Votive Deposition ◽  
Twisted Wire

A large hoard of Iron Age coins was discovered by metal-detecting at Pershore, Worcestershire, in 1993. During small-scale archaeological excavation further Iron Age coins were recovered, including a likely second hoard. Further fieldwork in the same vicinity as the hoard(s) produced more Iron Age finds, including more coins, and a possible fragment of a twisted wire gold torc. In total 1494 Iron Age gold and silver coins were recovered. Geophysical survey indicated that the hoard(s) lay at the southern end of an extensive area of settlement which, based on the fieldwalking evidence, was mainly of Iron Age and Roman date. This covered an overall area ofc.10 ha, within which several areas of more intensive activity were defined, including enclosures and possible round-houses. It is suggested that the coin hoard(s) indicate the location of a Late Iron Age religious space in an elevated landscape position situated on the edge of a settlement which continued into the Roman period. As part of the archaeological strategy, specialist deep-search metal-detecting was undertaken in order to establish that the site has now been completely cleared of metalwork caches

On the presence of odd transverse convective rolls in narrow-gap horizontal annuli

2002 ◽  
Vol 14 (3) ◽  
pp. 1291-1294 ◽  
Author(s):  
Mark P. Dyko ◽  
Kambiz Vafai
Keyword(s):  
Narrow Gap ◽  
Horizontal Annuli ◽  
Convective Rolls

scholarly journals The Differential Object Marking of The Arborense Dialect of Sardinian in Language Contact Setting

2020 ◽  
Vol 13 (1) ◽  
pp. 17-56
Author(s):  
Daniela Boeddu
Keyword(s):  
Language Contact ◽  
Historical Data ◽  
Noun Phrases ◽  
Personal Pronouns ◽  
Extensive Area ◽  
Differential Object Marking ◽  
Personal Names ◽  
Object Marking ◽  
High Degree ◽  
Mandatory Use

This paper focuses on the Arborense Differential Object Marking (dom) system, which in line with the typical Sardinian dom system marks the object noun phrases characterized by a high degree of animacy and specificity with the preposition a. This is why the Sardinian dom is also called prepositional accusative. Authors dealing with other Sardinian dialects agree in identifying three domains of distribution of the phenomenon: with personal pronouns and personal names the use of the preposition is mandatory; with inanimate common nouns it is excluded; with common nouns referring animate beings, strong variability occurs. On the basis of an oral corpus of contemporary Arborense, it can be stated that the area of mandatory use of dom is restricted in this dialect and that the optionality area turns out to be more extensive than assumed in traditional descriptions of this Sardinian phenomenon. Since all the Arborense speakers of the oral corpus are bilingual (Sardinian-Italian), the data reflect the situation of dom in a contact setting scenario where Sardinian and both Standard and Regional Italian interact. According to Putzu (2005) and Blasco Ferrer and Ingrassia (2010), the extensive area of optionality for the use of the Sardinian dom should be the result of the influence of Standard Italian. However, two facts must be considered that make this idea questionable: first, in the language contact scenario of Modern Sardinian not only Standard Italian but also Regional Italian (with a widespread use of the dom) play a role; second, the synchronic variation observed in contemporary Arborense replicates the same variation which characterizes historical data from texts of the 12th–19th centuries.

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