Temat: evolution equation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling ductile damage of steel in aggressive environment
Autorzy:: Kucharski, R.
Powiązania:: https://bibliotekanauki.pl/articles/1933197.pdf
Data publikacji:: 2006
Wydawca:: Politechnika Gdańska
Tematy:: stress corrosion damage
reaction-diffusion equations
damage evolution equation
FEM
Opis:: This paper is a proposition of a new damage model, extended to include the influence of the external environment, based on the Gurson yield function and a new damage evolution equation. The model also contains a mass transport equation based on Pick's law. A comparison of experimental and numerical results is included.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 4; 417-425
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Fourier image methods for evolution equations of deep-water waves
Autorzy:: Jankowski, Jan
Leszczyński, Henryk
Powiązania:: https://bibliotekanauki.pl/articles/1955223.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Gdańska
Tematy:: wave evolution
Laplace equation
Fourier transform
method of lines
Gauss-Hermite quadrature
Opis:: The velocity potential of the fluid satisfies the Laplace equation with nonlocal boundary conditions on a free surface. This differential problem is transformed to an evolution equation in Fourier variables. The Fourier transform images of boundary functions are approximated by Picard's iterations and the method of lines on meshes related to roots of Hermite polynomials. Due to convolutions of sine and cosine functions the integral terms of Picard's iterations reveal unexpected instabilities for wave numbers in a neighborhood of zero.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 3; 261-268
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Kolmogorov equation solution: multiple scattering expansion and photon statistics evolution modeling
Autorzy:: Guirao, M.
Leble, S.
Powiązania:: https://bibliotekanauki.pl/articles/1954433.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska
Tematy:: Kolmogorov equation
Fokker-Planck equation
multiple scattering expansion
photon statistics evolution
single scattering term
X-rays in beryl
Opis:: We consider a formulation of the Cauchy problem for the Kolmogorov equation which corresponds to a localized source of particles to be scattered by a medium with a given scattering amplitude density. The multiple scattering ampl itudes are introduced and the corresponding series solution of the equation is constructed. We investigate the integral representation for the first series terms, its estimations and values of the photon number of finite and point receivers. Application to the LIDAR problem and X-ray beam scattering for orthogonal and inclined to a layer is considered.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 2; 187--203
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: On Penna model of population evolution
Autorzy:: Magdoń-Maksymowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/1941717.pdf
Data publikacji:: 2000
Wydawca:: Politechnika Gdańska
Tematy:: population evolution
biological ageining
Penna model
bad mutations
migration process
logistic equation
Gompertz law
Opis:: Computer studies of population evolution are presented. Numerical calculations are based on the Penna model. This model accounts for mutation load of individuals resulting in non-trivial age (a) dependence of the mortality rate q(a) which may be compared with empirical data. The Penna model is also very flexible for suitable modifications of the population evolution process such as hunting, genetic death, migration etc. Here we present some examples of the population growth for different evolution rules. Calculations require about 100 MB memory for 10/sup 6/ population which is necessary to get reliable statistics. The typical running time for 3000 iteration steps is several hours for a HP S2000 machine.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 5-18
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: The identification of the boundary geometry with corner points in inverse two-dimensional potential problems
Autorzy:: Zieniuk, E.
Gabrel, W.
Powiązania:: https://bibliotekanauki.pl/articles/1931586.pdf
Data publikacji:: 2002
Wydawca:: Politechnika Gdańska
Tematy:: inverse boundary value problem
boundary geometry identification
geometry
parametric integral equation system
finite element method
boundary element method
evolution algorithm
genetic algorithms
Opis:: The paper presents fragment of a larger study concerning the effective methods of solving the inverse boundary value problems. The boundary value problem described here is formulated as a problem of the identification of a boundary geometry with corner points. A method using a parametric integral equations system (PIES) is proposed. PIES used in the method makes the easy modelling of the geometry with corner points possible. This effect is obtained by the application of modified splines. An evolution algorithm is used for the effective control of modifications of the boundary geometry. Some experimental tests of the efficiency of the discussed method were performed for two-dimensional inverse potential problems.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 651-660
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

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