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Crowd Behavior as an Example of the Evolution of a Complex System - Evacuation Models Proposal Based on the Symmetry Analysis Approach

100%

Sikora W. , Malinowski J.

Acta Physica Polonica A

2013

tom 124

nr 6

1005-1012

The evacuation of football stadium scenarios as examples of evolution of complex system are discussed. The models are presented as movements of individuals according to fields of displacements, calculated correspondingly to the given scenario. The assumption has been made that the most efficient evacuation is left based on the accordance of symmetry of allowed space, and this symmetry is taken into account while calculating the displacements field. The displacements related to every point of this space are calculated by the symmetry analysis method and fulfill the symmetry conditions of allowed space. The speed of each individual at every point in the presented model has the same quantity. Consequently, the times of evacuation and average presses acting on individuals during the evacuation are given. Both parameters are compared with and without symmetry considerations. They are calculated in the simulation procedure. For the realization of the simulation tasks the new program (using modified Helbing model) has been elaborated.

Application of supercritical fluid technology in bioprocess engineering

100%

Malinowski J. , Jarzebski A.

Biotechnologia

1996

nr 3

87-96

An overview of the prospects for application of supercritical fluid technology in bioprocess engineering is given.Recent investigations on the application of dense gases in biocatalysis particles formation, separation and purificatiob of biologically active compounds are critically reviewed.

Strategies in Crowd and Crowd Structure

51%

Gawroński P. , Malarz K. , Krawczyk M. , Malinowski J. , Kupczak A. , Sikora W. , Kułakowski K. , Wąs J. , Kantelhardt J.

Acta Physica Polonica A

2013

tom 123

nr 3

522-525

In an emergency situation, imitation of strategies of neighbours can lead to an order-disorder phase transition, where spatial clusters of pedestrians adopt the same strategy. We assume that there are two strategies, cooperating and competitive, which correspond to a smaller or larger desired velocity. The results of our simulations within the Social Force Model indicate that the ordered phase can be detected as an increase of spatial order of positions of the pedestrians in the crowd.