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Complexity Digest's Blog

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Do countries with lower self-citation rate produce higher-impact papers? Or, does humility pay?

October 18, 2011 Comments (0)

Studying the 62 countries producing most papers reported in the SCImago data base in the period 1996-2008, it was found that countries with low per capita publication numbers show variable rates of self-citations and produce publications with lower citation impact. In contrast, countries with larger numbers of citations per paper have also high per capita publication numbers and their researchers...

Tumour–host dynamics under radiotherapy

October 18, 2011 Comments (0)

Tumour–host interaction is modelled by the Lotka–Volterra equations. Qualitative analysis and simulations show that this model reproduces all known states of development for tumours. Radiotherapy effect is introduced into the model by means of the linear-quadratic model and the periodic Dirac delta function. The evolution of the system under the action of radiotherapy is simulated and...
Chaos, Solitons & Fractals

A Quantitative Theory of Solid Tumor Growth, Metabolic Rate and Vascularization

October 18, 2011 Comments (0)

Here, we construct a quantitative, predictive theory of solid tumor growth, metabolic rate, vascularization and necrosis that integrates the relationships between these...

Cooperative game in a two-lane traffic flow

October 18, 2011 Comments (0)

We use cellular automata model to study the cooperation between cyclists. In the two-lane model, cyclists can change lanes. Even there is someone on the back they will take a cooperative attitude. It means that they will be in a same lattice. Simulation carried out under the open borders. Simulation results show that the density in a certain area appeared surge. When the (or) is constant and (or)...

Smart Swarms of Bacteria-Inspired Agents with Performance Adaptable Interactions

October 18, 2011 Comments (0)

Many groups of organisms, from colonies of bacteria and social insects through schools of fish and flocks of birds to herds of mammals exhibit advanced collective navigation. Identifying the minimal features of biologically-inspired interacting agents that can lead to emergence of “intelligent” like collective navigation and decision making is fundamental to our understanding of collective...
PLoS Comput Biol

Dynamical modeling of collective behavior from pigeon flight data: flock cohesion and dispersion

October 18, 2011 Comments (0)

Several models of flocking have been promoted based on simulations with qualitatively naturalistic behavior. In this paper we provide the first direct application of computational modeling methods to infer flocking behavior from experimental field data. We show that this approach is able to infer general rules for interaction, or lack of interaction, among members of a flock or, more generally,...

Indications of marine bioinvasion from network theory

October 18, 2011 Comments (0)

The transport of huge amounts of small aquatic organisms in the ballast tanks and at the hull of large cargo ships leads to ever increasing rates of marine bioinvasion. In this study, we apply a network theoretic approach to examine the introduction of invasive species into new ports by global shipping. (…) Our results reveal (…) that quick spread of invasive organisms between ports is...
Eur. Phys. J. B

Competition of individual and institutional punishments in spatial public goods games

October 18, 2011 Comments (0)

We have studied the evolution of strategies in spatial public goods games where both individual (peer) and institutional (pool) punishments are present beside unconditional defector and cooperator strategies. (…) According to our numerical data peer punishers prevail and control the system behavior in a large segments of parameters while pool punishers can only survive in the limit of weak peer...

A New Existence and Uniqueness Theorem for Continuous Games

October 18, 2011 Comments (0)

This paper derives a general sufficient condition for existence and uniqueness [of a Nash equilibrium] in continuous games using a variant of the contraction mapping theorem applied to mappings from a subset of the real line on to...
The B.E. Journal of Theoretical Economics

Principles of Evolution: From the Planck Epoch to Complex Multicellular Life

October 18, 2011 Comments (0)

With contributions from a team of leading experts, this volume provides a comprehensive survey of recent achievements in our scientific understanding of evolution. The questions it asks concern the beginnings of the universe, the origin of life and the chances of its arising at all, the role of contingency, and the search for universal features in the plethora of evolutionary phenomena....