scholarly journals Strong interaction between plants induces circular barren patches: fairy circles

2014 ◽  
Vol 372 (2027) ◽  
pp. 20140009 ◽  
Author(s):  
C. Fernandez-Oto ◽  
M. Tlidi ◽  
D. Escaff ◽  
M. G. Clerc
Keyword(s):  
South Africa ◽  
Strong Interaction ◽  
Stabilization Mechanism ◽  
Bare State ◽  
Circular Shape ◽  
Localized Structures ◽  
Non Local ◽  
Model Independent ◽  
Local Coupling

Fairy circles consist of isolated or randomly distributed circular areas devoid of any vegetation. They are observed in vast territories in southern Angola, Namibia and South Africa. We report on the formation of fairy circles, and we interpret them as localized structures with a varying plateau size as a function of the aridity. Their stabilization mechanism is attributed to a combined influence of the bistability between the bare state and the uniformly vegetation state, and Lorentzian-like non-local coupling that models the competition between plants. We show how a circular shape is formed, and how the aridity level influences the size of fairy circles. Finally, we show that the proposed mechanism is model-independent.

scholarly journals Chimera states and the interplay between initial conditions and non-local coupling

2017 ◽  
Vol 27 (3) ◽  
pp. 033110 ◽  
Author(s):  
Peter Kalle ◽  
Jakub Sawicki ◽  
Anna Zakharova ◽  
Eckehard Schöll
Keyword(s):  
Initial Conditions ◽  
Chimera States ◽  
Non Local ◽  
Local Coupling

Non-Local Coupling and Partial Synchronization in Chaotic Systems

2006 ◽  
Vol 23 (4) ◽  
pp. 786-789 ◽  
Author(s):  
Ao Bin ◽  
Ma Xiao-Juan ◽  
Li Yun-Yun ◽  
Zheng Zhi-Gang
Keyword(s):  
Chaotic Systems ◽  
Partial Synchronization ◽  
Non Local ◽  
Local Coupling

scholarly journals Non-local coupling of two donor-bound electrons

2013 ◽  
Vol 15 (3) ◽  
pp. 033020 ◽  
Author(s):  
J Verduijn ◽  
R R Agundez ◽  
M Blaauboer ◽  
S Rogge
Keyword(s):  
Non Local ◽  
Local Coupling ◽  
Bound Electrons

ON THE EXISTENCE OF THE SUPERSTRING AXION MINI-STAR

2002 ◽  
Vol 17 (03) ◽  
pp. 171-174 ◽  
Author(s):  
M. D. POLLOCK
Keyword(s):  
Strong Interaction ◽  
Decay Constant ◽  
Critical Value ◽  
Decay Constants ◽  
Laser Amplification ◽  
Model Independent ◽  
Theory Formula ◽  
Lasing Mechanism

It is shown that the lasing mechanism of axion solitonic stars found by Tkachev is suppressed above a critical value of the QCD decay constant fa ≈ 1015 GeV . This means, in particular, that the heterotic superstring axion mini-star — for which theory [Formula: see text], where λ ≡ fB/fA is the ratio of the decay constants of the second and model-independent axions, respectively, and [Formula: see text] is the strong-interaction coupling — is allowed to form, the laser amplification being exp A, where [Formula: see text]. Relaxation may occur either by the "gravitational cooling" proposed by Seidel and Suen, and by Khlebnikov, and/or by the four-axion self-interaction studied by Tkachev.

scholarly journals The economic impact of the Volksblad Arts Festival

2006 ◽  
Vol 6 (1) ◽  
Author(s):  
A. J. Strydom ◽  
M. Saayman ◽  
A. Saayman
Keyword(s):  
South Africa ◽  
Economic Impact ◽  
Local Economy ◽  
Arts Festivals ◽  
Event Tourism ◽  
Arts Festival ◽  
Non Local ◽  
Potential Impact ◽  
Popular Festivals ◽  
The City

Purpose: Arts festivals, as a form of event tourism, are becoming more and more popular in South Africa with new festivals developing annually. The Volksblad Arts Festival in Bloemfontein celebrated its fifth anniversary in 2005. The purpose of this paper is to indicate the economic impact of the annual Volksblad Arts Festival on the local economy of Bloemfontein. Results are also compared with research done at other popular festivals in South Africa. Design/Methodology/Approach: The main thrust of the paper is to determine the economic impact of the Volksblad Arts Festival in Bloemfontein. More than 400 visitor questionnaires and 72 business questionnaires were administered and successfully completed during the festival that took place from 12-17 July 2005. Findings: The results show that this festival generates R18 405 653. If one compares it to festivals such as the KKNK in Oudtshoorn, the National Arts Festival in Grahamstown and even Aardklop held in Potchefstroom, it is evident that Volksblad is a smaller festival and it is therefore also expected that the economic impact of the festival should be less. Implications: This paper presents a comprehensive approach to understanding the measurement of the economic impact of a festival like the Volksblad Arts Festival. It provides tourism managers of Bloemfontein with an indication of the potential of event tourism as a source of income for the city. It also indicates the need for more extensive marketing in order to increase the percentage of non-local visitors to the particular festival. Originality/Value: Bloemfontein is increasingly regarded as an event tourism destination rather than an end destination for leisure tourists. This research represents an original attempt to indicate the potential impact of events to the tourism managers of Bloemfontein as well as other destinations with similar interests.

scholarly journals Investigation of DNA Breather Dynamics in A Model with Non-Local Inter-Site Interaction

2020 ◽  
Vol 15 (1) ◽  
pp. 93-105
Author(s):  
E.I. Geraskin ◽  
V.D. Lakhno ◽  
A.P. Chetverikov ◽  
A.S. Shigaev
Keyword(s):  
Stacking Interactions ◽  
Base Pairs ◽  
Non Local ◽  
Local Coupling ◽  
Nonlocal Nature

A variant of the Peyrard-Bishop-Dauxois model is proposed, which takes account of the partially delocalized nature of DNA stacking interactions. It is shown that the nonlocal nature of the inter-site potential can lead to an increase in the local cooperativity of the base pairs' opening an increasing in the number of simultaneously opening adjacent nucleotide pairs during the denaturation bubble's nucleation. The process of the formation and propagation of mobile breathers excited by the initial displacements of a number of nucleotide pairs has been studied. It is revealed that taking account of the non-local coupling in the Peyrard-Bishop-Dauxois model, while maintaining the remaining parameters of the model, leads to a decrease in the speed of the mobile breather and an increase in the probability of nucleation of the denaturation bubble.

Homogenization for a non-local coupling model

2008 ◽  
Vol 87 (12) ◽  
pp. 1311-1323 ◽  
Author(s):  
R. Hochmuth
Keyword(s):  
Coupling Model ◽  
Non Local ◽  
Local Coupling
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