منابع مشابه
Catalan Traffic at the Beach
The ubiquitous Catalan numbers Cn = (2n n ) / (n + 1) occur as t (n,−n) in the following table showing the number of ways to reach the point (n,m) on a rectangular grid under certain traffic restrictions, indicated by arrows. m 1↑→ 3↑→ 6↑→ 9↑→ 12↑→ 12↑→ 12↓→ ↘ 2 1↑→ 2↑→ 3↑→ 3↑→ 3↓→ ↘ 12↓→↘ 1 1↑→ 1↑→ 1↓→ ↘ 3↓→↘ 3↓→↘ 12↓→↘ start here 1↑→gate ↘ 1↓→↘ 1↓→↘ 3↓→↘ 6↓→↘ 15↓→↘ −1 ≈ 1 →↘ 1↓→↘ 2↓→↘ 4↓→↘ 9↓...
متن کاملSun protection by families at the beach.
BACKGROUND During the last decade, results of surveys of adults showed an increase in sun protection knowledge, a slight decline in the attitude that having a tan was healthy, widespread sunscreen use as the principal method of solar protection, and an increase in sunburning. METHODS During the summer of 1996, observers recorded the sun protection activities of 352 family groups as they arriv...
متن کاملSolar protection of children at the beach.
BACKGROUND Excessive sun exposure during childhood has been associated with subsequent development of skin cancers. Children have been advised to avoid sun exposure, use protective clothing, and apply sunscreen lotions, but how completely these recommendations are followed has not been studied. OBJECTIVE To determine the extent of sun protection among children visiting lake beaches, the metho...
متن کاملModeling Ocean Dynamics at Waikiki Beach
Acknowledgements I would like to thank Baylor Fox-Kemper for not only advising me on my thesis, but also providing valuable information about pursuing a career in physical oceanography. Also, I would like to thank Mark Merrifield, who got me involved in this project and provided all the data collected from Waikiki. Finally, I am greatly appreciative of Brad Marston, for providing me with the op...
متن کاملAlongshore Topographic Variability at a Nourished Beach
The present paper examines the generation and inter-annual evolution of alongshore variability in topography measured after the implementation of a sand nourishment. The magnitude of the topographic variability is quantified using 3.5 years of monthly survey data. The emergence and temporal change in alongshore morphological variability is compared with environmental and topographic controls pr...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1922
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800108908