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Loopy Levy flights enhance tracer diffusion in active suspensions 期刊论文
NATURE, 2020, 579 (7799) : 364-+
作者:  Hu, Bo;  Jin, Chengcheng;  Zeng, Xing;  Resch, Jon M.;  Jedrychowski, Mark P.;  Yang, Zongfang;  Desai, Bhavna N.;  Banks, Alexander S.;  Lowell, Bradford B.;  Mathis, Diane;  Spiegelman, Bruce M.
收藏  |  浏览/下载:28/0  |  提交时间:2020/07/03

A theoretical framework describing the hydrodynamic interactions between a passive particle and an active medium in out-of-equilibrium systems predicts long-range Levy flights for the diffusing particle driven by the density of the active component.


Brownian motion is widely used as a model of diffusion in equilibrium media throughout the physical, chemical and biological sciences. However, many real-world systems are intrinsically out of equilibrium owing to energy-dissipating active processes underlying their mechanical and dynamical features(1). The diffusion process followed by a passive tracer in prototypical active media, such as suspensions of active colloids or swimming microorganisms(2), differs considerably from Brownian motion, as revealed by a greatly enhanced diffusion coefficient(3-10) and non-Gaussian statistics of the tracer displacements(6,9,10). Although these characteristic features have been extensively observed experimentally, there is so far no comprehensive theory explaining how they emerge from the microscopic dynamics of the system. Here we develop a theoretical framework to model the hydrodynamic interactions between the tracer and the active swimmers, which shows that the tracer follows a non-Markovian coloured Poisson process that accounts for all empirical observations. The theory predicts a long-lived Levy flight regime(11) of the loopy tracer motion with a non-monotonic crossover between two different power-law exponents. The duration of this regime can be tuned by the swimmer density, suggesting that the optimal foraging strategy of swimming microorganisms might depend crucially on their density in order to exploit the Levy flights of nutrients(12). Our framework can be applied to address important theoretical questions, such as the thermodynamics of active systems(13), and practical ones, such as the interaction of swimming microorganisms with nutrients and other small particles(14) (for example, degraded plastic) and the design of artificial nanoscale machines(15).


  
Statistical forecasting of tropical cyclone landfall activities over the North Indian Ocean rim countries 期刊论文
ATMOSPHERIC RESEARCH, 2019, 227: 89-100
作者:  Wahiduzzaman, Md;  Yeasmin, Alea
收藏  |  浏览/下载:26/0  |  提交时间:2019/11/27
Statistical forecasting  Tropical cyclones  Poisson Regression  Generalised Additive Model  North Indian Ocean  
Cannabis legalization by states reduces illegal growing on US national forests 期刊论文
ECOLOGICAL ECONOMICS, 2019, 164
作者:  Prestemon, Jeffrey P.;  Koch, Frank H.;  Donovan, Geoffrey H.;  Lihou, Mary T.
收藏  |  浏览/下载:19/0  |  提交时间:2019/11/27
Marijuana  Grows  Gardens  Public Lands  Markets  Negative Binomial  Poisson  
Temporal statistical analysis and predictive modelling of drought and flood in Rundu-Namibia 期刊论文
CLIMATE DYNAMICS, 2019, 53: 1247-1260
作者:  Orti, Miguel Vallejo;  Negussie, Kaleb G.
收藏  |  浏览/下载:16/0  |  提交时间:2019/11/27
Crop production  Drought  ENSO  Flood  Food security  Lorenz curve  Namibia  Poisson point process  Rainfall  
Modeling ingrowth for empirical forest prediction systems 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 433: 771-779
作者:  Zell, Juergen;  Rohner, Brigitte;  Thuerig, Esther;  Stadelmann, Golo
收藏  |  浏览/下载:17/0  |  提交时间:2019/04/09
Forest scenario model  Negative binomial distribution  Swiss national forest inventory  Multinomial regression  Poisson distribution  Recruitment modeling  Weibull distribution  Zero inflation  
Non-stationary peaks-over-threshold analysis of extreme precipitation events in Finland, 1961-2016 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019, 39 (2) : 1128-1143
作者:  Pedretti, Daniele;  Irannezhad, Masoud
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
climate change  extreme precipitation  extreme value analysis  Generalized Pareto  non-stationarity  Poisson distribution  
From a breeze to the four winds: A panel analysis of the international diffusion of renewable energy incentive policies (2005-2015) 期刊论文
ENERGY POLICY, 2019, 125: 317-329
作者:  Cia Alves, Elia Elisa;  Steiner, Andrea;  Medeiros, Marcelo de Almeida;  Alves da Silva, Marcelo Eduardo
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Renewable energy  Policy diffusion  Poisson regression model  Panel analysis  
A fine-scale state-space model to understand drivers of forest fires in the Himalayan foothills 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 432: 902-911
作者:  Murthy, Karthik K.;  Sinha, Samir Kumar;  Kaul, Rahul;  Vaidyanathan, Srinivas
收藏  |  浏览/下载:14/0  |  提交时间:2019/04/09
Forest fire  MODIS  Himalayan terai  Poisson regression  Zero-inflated negative binomial models  Anthropogenic influences  Fire management  
Seasonal prediction of the typhoon genesis frequency over the Western North Pacific with a Poisson regression model 期刊论文
CLIMATE DYNAMICS, 2018, 51: 4585-4600
作者:  Zhang, Xinchang;  Zhong, Shanshan;  Wu, Zhiwei;  Li, Yun
收藏  |  浏览/下载:21/0  |  提交时间:2019/04/09
Typhoon genesis frequency  Western North Pacific  Prediction  Poisson regression  
Biodiesel investment in a disruptive tax-credit policy environment 期刊论文
ENERGY POLICY, 2018, 123: 19-30
作者:  Liu, Shen;  Colson, Gregory;  Wetzstein, Michael
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Biodiesel investment  Disruptive biodiesel policy  Poisson policy jumps  Real options