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Tytuł:
From the Editor
Autorzy:
Maksymowicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2012692.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 451
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the evolution of migrating population with two competing species
Autorzy:
Magdoń-Maksymowicz, M.
Maksymowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/305345.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
computer simulation
population evolution
migration
Penna model
genetic mutations
Opis:
A computer experiment study of population evolution and its dynamics is presented for two competing species (A and B) which share two habitats (1 and 2) of a limited environmental capacity. The Penna model of biological aging, based on the concept of defective mutation accumulation, was adopted for migrating population. In this paper, we assume and concentrate on the case when only one species (A) is mobile. For isolated habitats and for any initial population, we get at equilibrium spatial population distribution (A, B) in which A occupies location ’1’ only, while B-species is the ultimate winner in ’2’. This is achieved by suitable choice of model parameters so habitat ’1’ is more attractive for species ’A’ while location ’2’ is more advantageous to ’B’. However, population distribution begins to differ when migration between habitats is allowed. Initially stable distribution (A, B), becomes (A, A&B) with a mixed stationary population in location ’2’. For a higher migration rate, initial (A, B) distribution goes to (A, A) distribution, in which A species is dominant also in a less friendly habitat ’2’. However, a further increase in migration rate brings sequence (A, B)b(B, B). In short, for sufficiently high mobility of A-species, they eliminate themselves. Other scenarios not discussed here were also studied. They offer a rich variety of different sequences of population distribution regarding their size as well as other characteristics.
Źródło:
Computer Science; 2013, 14 (4); 615-627
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulating the spread of the BSE disease: a cellular automata approach
Autorzy:
Magdoń-Maksymowicz, M.
Maksymowicz, A. Z.
Powiązania:
https://bibliotekanauki.pl/articles/1964173.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska
Tematy:
computer simulation
disease spreading
BSE
cellular automata method
Opis:
The rules of evolution applied in the cellular automata approach may correspond to the propagation of the mad cow disease. In a computer simulation of the BSE disease's spread both inherited and infectious mechanisms are accounted for. The initial population of items is randomly distributed on a two-dimensional square lattice, Nx × Ny = 1000 × 1000, with a fraction of 1 percent the items already infected. Alternatively, faulty prions may spontaneously develop during the simulation with a very small frequency. Our results indicate a critical probability, pc, of BSE transmission, so that for p below the threshold the population recovers. For p > pc the disease is launched in the population with a dynamic equilibrium between the healthy and infected fractions of the population. The threshold is very sensitive to spatial clustering of the population and the detailed rules for the disease's onset, evolution and propagation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 2; 179-185
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin Films Investigations by Means of Spin-Wave Resonance
Autorzy:
Maksymowicz, A. Z.
Maksymowicz, L. J.
Whiting, J. S. S.
Powiązania:
https://bibliotekanauki.pl/articles/1891792.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.50.+g
76.30.-v
73.90.+f
Opis:
Magnetic resonance technique may successfully be applied to determine some basic parameters such as g-factor, magnetization M$\text{}_{s}$ or anisotropy energy constant K$\text{}_{u}$ in thin magnetic films. These parameters are obtained from a ferromagnetic resonance experiment when uniform precession of M$\text{}_{s}$ takes place. From spin-wave resonance one may extract very valuable information on the exchange constant A or the surface conditions characterized by the surface anisotropy energy (or pinning parameters ρ). In fact, it is only spin-wave resonance or similar techniques which allow for measurements of A, ρ or the coupling constant K$\text{}_{c}$ between ferromagnetic sublayers in multi-layered structure. The magnetic phase diagram, temperature dependence of the spin-waves stiffness constant, and the anisotropy energy constant may also be listed as less common examples of spin-wave resonance technique application for the investigation of thin films. This paper presents a theoretical approach to typical examples of experimental results and their interpretation from spin-wave resonance measurements.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 665-673
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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