Results 91 to 100 of about 517,273 (291)

Asymptotic Spreading of a Cholera Epidemic Model in a Periodic Environment

, 2022
Abstract This paper is devoted to the spreading property of a cholera epidemic model, which is built upon a time-periodic reaction-diffusion system that is not necessarily monotonic. When the initial distribution of infected hosts and bacteria appears on a compact domain, we derive a rough expansion speed of the infection over space.
Guo Lin, Shuxia Pan, Xueying Wang
openaire   +1 more source

Heterogeneity in Food Price Inflation Convergence Across the EU: Evidence From Club Dynamics and Structural Breaks

Agribusiness, EarlyView.
ABSTRACT This study examines food price inflation rate convergence among EU27 Member States from 2005 to 2024, focusing on structural breaks, external shocks, and regional disparities. Using panel unit root tests and club convergence analysis, the findings reveal no overall convergence but identify multiple convergence clubs.
Tibor Bareith, Imre Fertő
wiley   +1 more source

Fast propagation for nonlocal delay equations with slowly decaying initial values

Electronic Journal of Differential Equations, 2012
This article concerns the long time behavior of solutions to nonlocal delay equations when the initial values decay slowly at infinity towards the unstable steady state.
Fuguo Zhu
doaj  

Lieb-Robinson bounds and out-of-time order correlators in a long-range spin chain

Physical Review Research, 2020
Lieb-Robinson bounds quantify the maximal speed of information spreading in nonrelativistic quantum systems. We discuss the relation of Lieb-Robinson bounds to out-of-time order correlators, which correspond to different norms of commutators C(r,t)=[A_{i}
Luis Colmenarez, David J. Luitz
doaj   +1 more source

Do More Open Economies Export Less Diversely in Brazilian Agribusiness?

Agribusiness, EarlyView.
ABSTRACT This paper asks whether municipalities with a larger export‐to‐revenue ratio display a more concentrated bundle of exported goods in Brazilian agribusiness. Recent advances in export imputation for Brazilian municipalities allow for an analysis of the concentration profile of each municipality and its association with export openness.
Alan Leal, Michelle Marcia Viana Martins
wiley   +1 more source

Broadband MC DS-CDMA Using Space-Time and Frequency-Domain Spreading

, 2002
In this contribution multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) using space-time spreading (STS) assisted transmit diversity and frequency-domain (F-domain) spreading is investigated in the context of broadband communications
Yang, L-L., Hanzo, L.
core   +1 more source

Dynamics of a time-periodic and delayed reaction-diffusion model with a quiescent stage

Electronic Journal of Qualitative Theory of Differential Equations, 2016
In this paper, we study a time-periodic and delayed reaction-diffusion system with quiescent stage in both unbounded and bounded habitat domains. In unbounded habitat domain $\mathbb{R}$, we first prove the existence of the asymptotic spreading speed and
Shuang-Ming Wang, Liang Zhang
doaj   +1 more source

Value of Information of Improved Traceability in Fresh Produce Markets

Agribusiness, EarlyView.
ABSTRACT Traceability plays an important role in promoting a safe food supply by fostering transparent information exchange along the food supply chain. New technological innovations have the potential to improve traceability outcomes, as greater transparency along the food supply chain can aid in pinpointing precise origins of the contamination ...
Kelsey Vourazeris, Mark R. Manfredo, Michael N. Kozicki   +2 more
wiley   +1 more source

Asymptotic behavior and sharp estimates for spreading fronts in a cooperative system with free boundaries

Advanced Nonlinear Studies
This paper investigates the dynamics of a reaction-diffusion system with two free boundaries, modeling the invasion of two cooperative species, where the free boundaries represent expanding fronts.
Qin Qian, Jiao Jinjing, Wang Zhiguo, Nie Hua   +3 more
doaj   +1 more source

First-passage-time problem for tracers in turbulent flows applied to virus spreading

Physical Review Research, 2020
We study the spreading of viruses, such as SARS-CoV-2, by airborne aerosols, via a first-passage-time problem for Lagrangian tracers that are advected by a turbulent flow: By direct numerical simulations of the three-dimensional (3D) incompressible ...
Akhilesh Kumar Verma, Akshay Bhatnagar, Dhrubaditya Mitra, Rahul Pandit   +3 more
doaj   +1 more source