scholarly journals Dynamics and pattern formation in large systems of spatially-coupled oscillators with finite response times

2011 ◽  
Vol 21 (2) ◽  
pp. 023122 ◽  
Author(s):  
Wai Shing Lee ◽  
Juan G. Restrepo ◽  
Edward Ott ◽  
Thomas M. Antonsen
Keyword(s):  
Pattern Formation ◽  
Coupled Oscillators ◽  
Response Times ◽  
Large Systems

An Approach Based on Market Economy for Consistency Management in Data Grids with Optorsim Simulator

2010 ◽  
pp. 269-280
Author(s):  
Ghalem Belalem ◽  
Belabbes Yagoubi ◽  
Samah Bouamama
Keyword(s):  
Quality Of Service ◽  
Response Times ◽  
Data Access ◽  
Data Grids ◽  
Distributed Resources ◽  
Suggested Approach ◽  
Consistency Management ◽  
Geographically Distributed ◽  
Large Systems

Data Grids are currently solutions suggested to meet the needs of scale large systems. They provide highly varied and geographically distributed resources of which the goal is to ensure fast and effective data access. This improves availability, and tolerates breakdowns. In such systems, these advantages are not possible without the use of replication. The use of the technique of replication poses a problem in regards to the maintenance of the consistency of the same data replicas; the strategies of replication of the data and scheduling of jobs were tested by simulation. Several grid simulators were born. One of the most interesting simulators for this study is the OptorSim tool. In this chapter, the authors present an extension of the OptorSim by a consistency management module of the replicas in Data Grids; they propose a hybrid step which combines the economic models conceived for a hierarchical model with two levels. This suggested approach has two vocations, the first allowing a reduction in response times compared to an pessimistic approach, the second gives the good quality of service compared to optimistic approach.

Diversity and tectonics: predictions from neutral theory

Paleobiology ◽  
2018 ◽  
Vol 44 (2) ◽  
pp. 219-236 ◽  
Author(s):  
Steven M. Holland
Keyword(s):  
Plate Tectonics ◽  
Response Times ◽  
Neutral Theory ◽  
Oceanic Island ◽  
Volcanic Arcs ◽  
Regional Effects ◽  
Coastal Marine ◽  
Latitudinal Position ◽  
Large Systems ◽  
The Individual

AbstractNumerical simulations of neutral metacommunities are used here to predict the effects of growth and shrinkage of metacommunities, as well as their separation and merging caused by continental collision and rifting and their secondary eustatic effects. Although growth and shrinkage of metacommunities predictably change diversity, separating and merging metacommunities have counterintuitive effects. Separating and merging metacommunities change diversity within the individual areas, especially so for smaller areas, but they cause no change in total diversity of the system, contrary to previous predictions. The response times of metacommunities are likely to be geologically undetectable except for enormously large systems. These models can be used to predict the plate-tectonic effects on the diversity of terrestrial, coastal-marine, deep-marine, and oceanic-island systems. Of these, global and regional coastal-marine systems are the most acutely sensitive to the changes in area and fragmentation caused by plate tectonics. Oceanic-island systems also experience global and regional changes in diversity during supercontinent breakup and assembly, with the global effects driven by the changing length of volcanic arcs, and the regional effects also driven by secondary eustatic changes in shallow-marine area. Although individual terrestrial provinces or continents may experience substantial changes in diversity from rifting and collision, global terrestrial diversity should be unchanged except for the relatively modest contributions caused by the secondary eustatic effects on land area. These changes in diversity may be reinforced or counteracted by the changing latitudinal position of metacommunities.

scholarly journals Mechanisms of synchronization and pattern formation in a lattice of pulse-coupled oscillators

1998 ◽  
Vol 57 (4) ◽  
pp. 3820-3828 ◽  
Author(s):  
Albert Díaz-Guilera ◽  
Conrad J. Pérez ◽  
Alex Arenas
Keyword(s):  
Pattern Formation ◽  
Coupled Oscillators ◽  
Pulse Coupled Oscillators

scholarly journals Echo phenomena in large systems of coupled oscillators

2008 ◽  
Vol 18 (3) ◽  
pp. 037115 ◽  
Author(s):  
Edward Ott ◽  
John H. Platig ◽  
Thomas M. Antonsen ◽  
Michelle Girvan
Keyword(s):  
Coupled Oscillators ◽  
Large Systems

Phase- and Center-Manifold Reductions for Large Populations of Coupled Oscillators with Application to Non-Locally Coupled Systems

1997 ◽  
Vol 07 (04) ◽  
pp. 789-805 ◽  
Author(s):  
Yoshiki Kuramoto
Keyword(s):  
Coupled Oscillators ◽  
Center Manifold ◽  
Coupled Systems ◽  
Center Manifold Reduction ◽  
Reduction Techniques ◽  
Phase Reduction ◽  
Large Populations ◽  
Large Systems ◽  
Model Equations ◽  
Manifold Reduction

In the first half of this paper, some general ideas will be developed on how to approach mathematically large systems of coupled limit-cycle oscillators. Two representative reduction techniques, namely, the phase reduction and the center-manifold reduction will be presented for a prototypal system of biological cell assembly with periodic activity. The evolution equation derived through each reduction method is further classified into three groups according to the range of the oscillator coupling (i.e. local, global and intermediate). As a consequence, six classes of model equations are obtained. In the second half of the paper, some new results from our recent study on non-locally coupled oscillators will be reported, and the generation of anomalous turbulent fluctuations obeying a power law will be discussed in some detail.

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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