Results 251 to 260 of about 4,800 (298)
Information Loss in Riffle Shuffling
Combinatorics, Probability and Computing, 2002 We study the asymptotic behaviour of the relative entropy (to stationarity) for a commonly used model for riffle shuffling a deck of n cards m times. Our results establish and were motivated by a prediction in a recent numerical study of Trefethen and Trefethen.
Dudley Stark +2 more
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Freshwater Biology, 2000
Summary 1 Unlike riffles, research has focused rarely on the hyporheic zone of pools. To highlight the functioning of a pool, field investigations were performed in a riffle-pool-riffle sequence by integrating simultaneously physico-chemistry, microbes and invertebrates.
Florian Mermillod-Blondin +2 more
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Summary 1 Unlike riffles, research has focused rarely on the hyporheic zone of pools. To highlight the functioning of a pool, field investigations were performed in a riffle-pool-riffle sequence by integrating simultaneously physico-chemistry, microbes and invertebrates.
Florian Mermillod-Blondin +2 more
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Understanding pool‐riffle dynamics through continuous morphological simulations
Water Resources Research, 2011 Pool-riffle dynamics is governed by complex time and spatial interactions between water and sediment flows. In the last few decades, significant advances have been made in characterizing and modeling the hydrodynamics of pool-riffle sequences, and this ...
JOSÉ F Rodríguez
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Morphology of riffle-pool sequences in the River Severn, England
Earth Surface Processes and Landforms, 2000 Despite the occurrence of pool-riffle sequences in many rivers there are few data concerning pool-riffle unit morphology. Of many criteria proposed to identify pool-riffle units, only two methods can be regarded as objective and robust.
Paul A Carling
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Riffle shuffles, cycles, and descents
Combinatorica, 1995The question of how many times a deck of cards must be shuffled so as to ensure that the resulting distribution of cards corresponds to a draw from the uniform distribution over all permutations of 52 cards has received some attention in the American Press. The present paper continues this line of inquiry.
Persi Diaconis +2 more
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Stage dependent variability in tractive force distribution through a riffle–pool sequence [PDF]
Catena, 2001 High resolution data on spatial and temporal variability in flow hydraulics and sediment transport within riffle–pool sequences are required to improve understanding of how fluvial processes maintain these meso-scale bedforms. This paper addresses this
George Heritage, Martin Charlton
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Leakage-Resilient Riffle Shuffle
2017Analysis of various card-shuffles – finding its mixing-time is an old mathematical problem. The results show that e.g., it takes \(\mathcal {O}(\log n)\) riffle-shuffles (Aldous and Diaconis, American Mathematical Monthly, 1986) to shuffle a deck of n cards while one needs to perform \(\varTheta (n \log n)\) steps via cyclic to random shuffle (Mossel ...
Pawel Lorek +2 more
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Formation of Riffles and Pools
Water Resources Research, 1971The formation of riffles and pools in natural streams is a means of self‐adjustment that minimizes their time rate of potential energy expenditure per unit mass of water in accordance with the law of least time rate of energy expenditure. The actual formation of pools and riffles is a combined process of dispersion and sorting.
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The macroinvertebrate faunas of riffles and pools
Water Research, 1983Abstract Macroinvertebrate data from studies of rivers, principally in upland areas, of North America (9) and U.K. (8) were examined to identify differences in the faunas of riffles and pools. Overall the number and representation of taxa in the two habitats was similar although some organisms (e.g.
P LOGAN, M BROOKER
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Geological Society of America Bulletin, 1970
The conventional view of pools and riffles in straight channels being identified with bends and inflections in meander trains is challenged; the alternative identification, pools and riffles inflections and bends is argued. Difficulties inherent in the conventional view are outlined and it is shown that the alternative is consistent with Bagnold9s idea
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The conventional view of pools and riffles in straight channels being identified with bends and inflections in meander trains is challenged; the alternative identification, pools and riffles inflections and bends is argued. Difficulties inherent in the conventional view are outlined and it is shown that the alternative is consistent with Bagnold9s idea
openaire +1 more source