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- Scarborough, Vernon L.; Dunning, Nicholas P.; Tankersley, Kenneth B.; Carr, Christopher; Weaver, Eric; Grazioso, Liwy; Lane, Brian; Jones, John G.; Buttles, Palma; Valdez, Fred; Lentz, David L.
- Proceedings of the National Academy of Sciences of the United States of America 2012 v.109 no.31 pp. 12408-12413
- sand, etc ; dredging; engineering; filtration; land use; landscapes; lowlands; management systems; tropical forests; water management; Guatemala; Show all 11 Subjects
- ... The access to water and the engineered landscapes accommodating its collection and allocation are pivotal issues for assessing sustainability. Recent mapping, sediment coring, and formal excavation at Tikal, Guatemala, have markedly expanded our understanding of ancient Maya water and land use. Among the landscape and engineering feats identified are the largest ancient dam identified in the Maya ...
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- Gruener, Simon; Sadjadi, Zeinab; Hermes, Helen E.; Kityk, Andriy V.; Knorr, Klaus; Egelhaaf, Stefan U.; Rieger, Heiko; Huber, Patrick
- Proceedings of the National Academy of Sciences of the United States of America 2012 v.109 no.26 pp. 10245-10250
- sand, etc ; glass; image analysis; imbibition; models; paper; porous media; surface tension; Show all 8 Subjects
- ... During spontaneous imbibition, a wetting liquid is drawn into a porous medium by capillary forces. In systems with comparable pore length and diameter, such as paper and sand, the front of the propagating liquid forms a continuous interface. Sections of this interface advance in a highly correlated manner due to an effective surface tension, which restricts front broadening. Here we investigate wa ...
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