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| Open AccessField theory for recurrent mobility
Systematic methods to characterize human mobility can lead to more accurate forecasting of epidemic spreading and better urban planning. Here the authors present a methodology to analyse daily commuting data by representing it with an irrotational vector field and a corresponding scalar potential.
- Mattia Mazzoli
- , Alex Molas
- & José J. Ramasco
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Article
| Open AccessMicrobial and metabolic succession on common building materials under high humidity conditions
Microbes inhabit built environments and could contribute to degradation of surfaces especially in damp conditions. Here the authors explore how communities of microbes and their metabolites affect four types of built surfaces under varying environmental conditions.
- Simon Lax
- , Cesar Cardona
- & Jack A. Gilbert
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Article
| Open AccessArchimedes’ law explains penetration of solids into granular media
The penetration dynamics of solid objects into granular media has been described by theories that are constrained to the use of phenomenological models or empirical parameters. Here, Kang et al. propose and test a parameter-free model for the dependence of the resistance force on penetration depth.
- Wenting Kang
- , Yajie Feng
- & Raphael Blumenfeld
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Article
| Open AccessRiver-bed armouring as a granular segregation phenomenon
River beds often exhibit armouring, in which formation of a coarse surface layer shields the finer underlying grains from erosion. Here, using experiments in a laboratory river and discrete and continuum models, the authors demonstrate that river-bed armouring is driven by vertical granular segregation.
- Behrooz Ferdowsi
- , Carlos P. Ortiz
- & Douglas J. Jerolmack
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Article
| Open AccessUnderstanding extreme sea levels for broad-scale coastal impact and adaptation analysis
Uncertainties in contemporary extreme sea levels (ESL) from mean sea level rise (SLR) projections have been overlooked in broad-scale risk and adaptation studies. Here, the authors quantify the uncertainties in present-day global ESL estimates and find that they exceed those from global SLR projections.
- T. Wahl
- , I. D. Haigh
- & A. B. A. Slangen