Wyniki wyszukiwania dla: SMALL PARAMETER EXPANSION

• Asymptotic Expansion Method with Respect to Small Parameter for Ternary Diffusion Models

  Publikacja

  • M. Danielewski
  • H. Leszczyński
  • A. Szafrańska

  - Interdisciplinary Sciences-Computational Life Sciences - Rok 2017

  Ternary diffusion models lead to strongly coupled systems of PDEs. We choose the smallest diffusion coefficient as a small parameter in a power series expansion whose components fulfill relatively simple equations. Although this series is divergent, one can use its finite sums to derive feasible numerical approximations, e.g. finite difference methods (FDMs).

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• Experiences from operation of various expansion devices in small scale ORC

  Publikacja

  • D. Mikielewicz
  • J. Wajs
  • J. Mikielewicz
  • K. Kosowski

  - Rok 2014

  The main aim of this paper was to present various expansion devices for an application in the small scale ORC system. The investigations were carried out in two parallel directions. One direction was to design and construct a device dedicated to the analyzed ORC system. The second direction was to adapt existing expansion devices for the needs of the analyzed ORC system. Four various devices were described and presented together...

• Uniform expansion estimates in the quadratic map as a function of the parameter, with a small critical neighborhood

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the parameter, with a very small critical neighborhood

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the cubic map as a function of the parameter

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the unimodal map with γ=1.5 as a function of the parameter

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the unimodal map with γ=2.5 as a function of the parameter

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the parameter, with a large range of parameters

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the parameter, using the “uniform” partition type

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the parameter, using the “critical” partition type

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the parameter, using the “derivative” partition type

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• A small-signal sound speed and parameter of non-linearity B/Ain a ternary mixture. Examples of calculations of mixture consisting of air, water and water vapor

  Publikacja

  • A. Perelomova

  - Rok 2005

  Zostało wyliczone zaburzenie entropii z dokładnością do członów nieliniowych rzędu drugiego. Jedyne założenie ograniczające, toże para wodna i powietrze są gazami doskonałymi. Ostatecznie,parametr nieliniowości i prędkość fali akustycznej przedstawione jako rodzinę krzywych, zależnych od trzech parametrów. Przedstawiono ilustrację tych zależności.

• Uniform expansion estimates in the quadratic map with the smallest critical neighborhood for which the expansion exponent λ0 is positive

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map with the smallest critical neighborhood for which the expansion exponent λ is positive

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map with the smallest critical neighborhood for which the expansion exponent λ0 is greater than 0.1

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map with the smallest critical neighborhood for which the expansion exponent λ is greater than 0.1

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Ultrashort Opposite Directed Pulses Dynamics with Kerr Effect and Polarization Account

  Publikacja

  • M. Kuszner
  • S. Leble

  - JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN - Rok 2014

  We present the application of projection operator methods to solving the problem of the propagation and interaction of short optical pulses of different polarizations and directions in a nonlinear dispersive medium. We restrict ourselves by the caseof one-dimensional theory, taking into account material dispersion and Kerr nonlinearity. The construction of operators is delivered in two variants: for the Cauchy problem and for the...

  Pełny tekst do pobrania w serwisie zewnętrznym

• Uniform expansion estimates in the quadratic map as a function of the critical neighborhood size

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• 3D POINT-CLOUD SPATIAL EXPANSION BY TOTAL LEAST-SQUARES LINE FITTING

  Publikacja

  • P. S. Dąbrowski
  • M. Zienkiewicz

  - PHOTOGRAMMETRIC RECORD - Rok 2020

  Point-cloud spatial expansion (PCSE) allows the creation of a new pointcloud form that presents an alternative geometry of an entire object in a single spatial view. Spatial expansion facilitates the analysis process and introduces an additional spatial parameter describing the point cloud. An important element of the PCSE method is determining the position of the axis of symmetry of a symmetrical object: the procedure for determining...

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• Uniform expansion estimates in the quadratic map as a function of the partition size, using Johnson’s algorithm

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the partition size, computing λ only

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the partition size, using the “derivative” partition type

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the partition size, using the “critical” partition type

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Uniform expansion estimates in the quadratic map as a function of the partition size, using the Floyd–Warshall algorithm

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: Uniform expansion estimates in one-dimensional dynamics

  This dataset contains selected results of numerical computations described in the paper "Quantitative hyperbolicity estimates in one-dimensional dynamics" by S. Day, H. Kokubu, S. Luzzatto, K. Mischaikow, H. Oka, P. Pilarczyk, published in Nonlinearity, Vol. 21, No. 9 (2008), 1967-1987, doi: 10.1088/0951-7715/21/9/002.

• Structure and thermal expansion of liquid bismuth

  Publikacja

  • S. Mudry
  • I. Shtablavyi
  • U. Liudkevych
  • S. Winczewski

  - MATERIALS SCIENCE-POLAND - Rok 2015

  Experimental structural data for liquid Bi were used for estimation of the main structure parameters as well as the thermal expansion coefficient both in supercooled and superheated temperature ranges. It was shown that the equilibrium melt had a positive thermal expansion coefficient within a temperature range upon melting and a negative one at higher temperatures. The former was related to structure changes upon melting, whereas...

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• Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

  Publikacja

  • A. Løken
  • S. Ricote
  • S. L. Wachowski

  - Crystals - Rok 2018

  This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict...

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• An Enhanced Reduced Basis Method for Wideband Finite Element Method Simulations

  Publikacja

  • D. Szypulski
  • G. Fotyga
  • M. Mrozowski

  - IEEE Access - Rok 2019

  In this paper, we present a novel strategy for selecting expansion points in the reduced basis method. A single computation of the error estimator is used to select a few expansion points in the multi-parameter space simultaneously. The number of selected points is determined adaptively, based on the accuracy of the current reduced model. The reliability and efficiency of this proposed approach are illustrated by numerical tests...

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• A Formal Approach to Model the Expansion of Natural Events: The Case of Infectious Diseases

  Publikacja

  • M. Teresa Signes-Pont
  • J. Boters Pitarch
  • J. Szymański
  • H. Mora-Mora

  - Parallel Processing Letters - Rok 2023

  A formal approach to modeling the expansion of natural events is presented in this paper. Since the mathematical, statistical or computational methods used are not relevant for development, a modular framework is carried out that guides from the external observation down to the innermost level of the variables that have to appear in the future mathematical-computational formalization. As an example we analyze the expansion of Covid-19....

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• Employees’ self-expansion as a mediator between perceived work conditions and work engagement and productive behaviors

  Publikacja

  • P. Jurek
  • T. Besta

  - Rok 2019

  There has been increasing scientific interest in the relationships between self-perception and group identity development processes as well as the behavioural implications of these processes in organizational contexts. Recently, the concept of workplace self-expansion has been introduced to work and organizational psychology. That is, the self-expanding characteristics of work and the workplace have been related to job satisfaction...

• Cavity-expansion approximation for projectile impact and penetration into sand

  Publikacja

  • V. Kotov
  • A. Bragov
  • V. Balandin
  • L. Igumnov
  • A. Lomunov
  • V. Eremeev
  • A. Cazzani

  - CONTINUUM MECHANICS AND THERMODYNAMICS - Rok 2022

  A one-dimensional problem of a spherical cavity expanding at a constant velocity from zero initial radius in an infinite granular medium, which has the first-kind self-similar solution, is considered. We are solving this dynamic spherical cavity-expansion problem to model rigid spheres penetrating into a granular media. Elastic–plastic deformation of the granular media is described in a barotropic approximation, using the high-pressure...

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• High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate

  Publikacja

  • A. D. Mielewczyk-Gryń
  • K. Gdula-Kasica
  • B. Kusz
  • M. Gazda

  - CERAMICS INTERNATIONAL - Rok 2012

  Magnesium doped lanthanum ortho-niobate (La0.98Mg0.02NbO4) was prepared by the molten salt synthesis method. X-ray diffraction and dilatometry methods were used to study high temperature behavior of the ceramic material. Special attention was paid to the phase transition between the monoclinic and tetragonal phases. The values of spontaneous strain on the basis of unit cell parameter, obtained by Rietveld refinement, have been...

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• Subcritical Thermodynamic Cycles with Organic Medium and Isothermal Expansion

  Publikacja

  • K. Kosowski
  • M. Piwowarski

  - ENERGIES - Rok 2020

  The efffciencies of the Organic Rankine Cycle (ORC) are not very high and only very seldom do they exceed 20%. The increase and optimization of initial parameters and certain modifications of the thermodynamic cycle make it possible to overcome these drawbacks. A new modified cycle has been described and analyzed in detail in the paper. Similarly to the Ericsson cycle for gas turbines, isothermal expansion in the turbine is suggested...

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• Sensitivity analysis based on non-intrusive regression-based polynomial chaos expansion for surgical mesh modelling

  Publikacja

  • K. Szepietowska
  • B. Magnain
  • I. Lubowiecka
  • E. Florentin

  - STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION - Rok 2018

  The modelling of a system containing implants used in ventral hernia repair and human tissue suffers from many uncertainties. Thus, a probabilistic approach is needed. The goal of this study is to define an efficient numerical method to solve non-linear biomechanical models supporting the surgeon in decisions about ventral hernia repair. The model parameters are subject to substantial variability owing to, e.g., abdominal wall...

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• Transcriptional activity of epigenetic remodeling genes declines in keratinocytes after in vitro expansion

  Publikacja

  • J. Kamińska
  • P. Langa
  • M. Deptuła
  • J. Zieliński
  • P. Sachadyn
  • A. Wardowska
  • M. Pikuła

  - Advances in Medical Sciences - Rok 2019

  PURPOSE: In vitro expansion is an invaluable method to obtain keratinocytes in amounts necessary for effective transplantation therapies. In vitro cell culturing provokes questions concerning potential epigenetic alterations occurring in expanded cells in the context of usefulness for transplantation and safety. The purpose of this study was to investigate as to whether keratinocyte expansion is associated with changes in the activity...

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• Robust Parameter Tuning of Antenna Structures by Means of Design Specification Adaptation

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2021

  Parameter tuning through numerical optimization has become instrumental in the design of high-performance antenna systems. Yet, practical optimization faces several major challenges, including high cost of massive evaluations of antenna characteristics, normally involving full-wave electromagnetic (EM) analysis, large numbers of adjustable variables, the shortage of reasonable initial solutions in the case of topologically complex...

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• Wykorzystanie metody Neldera-Meada do identyfikacji wartości parametrów niequasi-statycznego modelu małosygnałowego tranzystora MOS

  Publikacja

  • D. Trofimowicz
  • W. Kordalski

  - Przegląd Elektrotechniczny - Rok 2015

  W artykule zaprezentowano wyniki zastosowania metody sympleksu Neldera-Meada do ekstrakcji wartości parametrów niequasi-stycznego modelu małosygnałowego tranzystora MOS. Przedstawiono równoważny elektryczny schemat zastępczy i model matematyczny nowego modelu małosygnałowego MOSFETa dla częstotliwości mikrofalowych. Opisano zaimplementowany algorytm i otrzymane rezultaty badań.

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• Container port expansion towards the sea in the context of maritime spatial planning

  Publikacja

  • K. Krośnicka

  - EUROPA XXI - Rok 2019

  The growth of ships causes a significant increase in demand for new port surfaces and demands for the depths of water bodies in the ports. Due to technological changes in the transshipment and development pressure ports lacks space and they move towards the sea with their activities. The paper discusses the reasons for the phenomenon of expansion of ports towards the sea and its effects on maritime spatial planning.

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• Hybrid analysis of microwave components in cylindrical coordinates with function expansion in subdomains.

  Publikacja

  • M. Wiktor
  • M. Mrozowski

  - Rok 2004

  W artykule zaproponowano wydajną metodę przyspieszenia analizy FDTD, poprzez podział dziedziny obliczeniowej i zastosowanie różnych algorytmów w różnych elementach dziedziny. Zaproponowano uniwersalną metodę łączenia techniki PEE (Partial Eigenfunction Expansion)i niezmodyfikowanej FDTD w jednej analizie. Uzyskano redukcję liczby zmiennych oraz wydłużenie kroku czasowego.

• Surface effects of network materials based on strain gradient homogenized media

  Publikacja

  • Y. Rahali
  • V. Eremeev
  • J. Ganghoffer

  - MATHEMATICS AND MECHANICS OF SOLIDS - Rok 2020

  The asymptotic homogenization of periodic network materials modeled as beam networks is pursued in this contribution, accounting for surface effects arising from the presence of a thin coating on the surface of the structural beam elements of the network. Cauchy and second gradient effective continua are considered and enhanced by the consideration of surface effects. The asymptotic homogenization technique is here extended to...

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• TESTING CONTRACTION AND THERMAL EXPANSION COEFFICIENT OF CONSTRUCTION AND MOULDING POLYMER COMPOSITES

  Publikacja

  • Ł. Pyrzowski

  - Polish Maritime Research - Rok 2018

  The paper presents results of systematic tests of contraction and thermal expansion coefficients of materials based on polymer composites. The information on the above material properties is essential both at the design stage and during the use of finished products. Components for the samples were selected in such a way as to represent typical materials used for production of construction and moulding elements. The performed tests...

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• Interactive Query Expansion with the Use of Clustering by Directions Algorithm

  Publikacja

  • A. Kaczmarek

  - IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS - Rok 2011

  This paper concerns Clustering by Directions algorithm. The algorithm introduces a novel approach to interactive query expansion. It is designed to support users of search engines in forming web search queries. When a user executes a query, the algorithm shows potential directions in which the search can be continued. This paper describes the algorithm and it presents an enhancement which reduces the computational complexity of...

• Application of Illuminating Modes concept in modal expansion of elliptical resonator

  Publikacja

  • M. Pergoł
  • W. Zieniutycz

  - Rok 2013

  In the paper an IlluminatingModes (IM) approach as an extension of Spectral Domain Approach (SDA) is presented. IM concept is applied to the case of open microstrip planar elliptical resonator. A modal expansion of currents induced in the structures during illuminating them by a single plane wave is the novelty of the method. As an example of application of the method, we present the results obtained by an examination of two resonators...

• Dynamic polarizability of the relativistic hydrogenlike atom: Application of the Sturmian expansion of the Dirac-Coulomb Green function

  Publikacja

  • R. Szmytkowski

  - PHYSICAL REVIEW A - Rok 2002

  We utilize the Sturmian expansion of the Dirac-Coulomb Green function [R. Szmytkowski, J. Phys. B 30, 825 (1997)] to obtain components of the dynamic dipole polarizability tensor of the relativistic hydrogenlike atom in the ground state. It is found that the tensor may be expressed in terms of two independent quantities: a scalar polarizability and a vector polarizability, the latter being of the relativistic origin. In the static...

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• Periodic expansion in determining minimal sets of Lefschetz periods for Morse–Smale diffeomorphisms

  Publikacja

  • G. Graff
  • M. Lebiedź
  • A. Myszkowski

  - Journal of Fixed Point Theory and Applications - Rok 2019

  We apply the representation of Lefschetz numbers of iterates in the form of periodic expansion to determine the minimal sets of Lefschetz periods of Morse–Smale diffeomorphisms. Applying this approach we present an algorithmic method of finding the family of minimal sets of Lefschetz periods for Ng, a non-orientable compact surfaces without boundary of genus g. We also partially confirm the conjecture of Llibre and Sirvent (J Diff...

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• Regression points in non-intrusive polynomial chaos expansion method and D-optimal design

  Publikacja

  • K. Szepietowska
  • B. Magnain
  • I. Lubowiecka
  • E. Florentin

  - Machine Dynamics Research - Rok 2017

  The paper addresses selected issues of uncertainty quantification in the modelling of a system containing surgical mesh used in ventral hernia repair. Uncertainties in the models occur e.g. due to variability of abdominal wall properties among others. In order to include them, a non-intrusive regression-based polynomial chaos expansion method is employed. Its accuracy depends on the choice of regression points. In the study a relation...

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• An Analysis of Elliptical-Rectangular Multipatch Structure on Dielectric-Coated Confocal and Nonconfocal Elliptic Cylinders

  Publikacja

  • R. Lech
  • W. Marynowski
  • A. Kusiek

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2015

  A rigorous analysis of the resonance frequency problem of an elliptical-rectangular microstrip structure mounted on dielectric-coated elliptic conducting cylinder, with electrically small radius, is investigated in this paper. A full-wave analysis and a moment-method calculation are employed. The analysis is carried out considering the expansion of the field as a series of Mathieu functions. The complex resonance frequencies of...

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• Spectrum Sensing Based on Hybrid Spectrum Handoff in Cognitive Radio Networks

  Publikacja

  • L. Vaduganathan
  • S. Neware
  • P. Falkowski-Gilski
  • P. B. Divakarachari

  - ENTROPY - Rok 2023

  The rapid advancement of wireless communication combined with insufficient spectrum exploitation opens the door for the expansion of novel wireless services. Cognitive radio network (CRN) technology makes it possible to periodically access the open spectrum bands, which in turn improves the effectiveness of CRNs. Spectrum sensing (SS), which allows unauthorized users to locate open spectrum bands, plays a fundamental part in CRNs....

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• Julita Wasilczuk dr hab.

  Osoby

  Katedra Przedsiębiorczości

  Urodzona 5 kwietnia 1965 roku w Gdańsku. W latach 1987–1991 odbyła studia na Wydziale Ekonomiki Transportu Uniwersytetu Gdańskiego (obecnie Wydział Ekonomii). Od 1993 roku zatrudniona na nowo utworzonym Wydziale Zarządzania i Ekonomii, Politechniki Gdańskiej, na stanowisku asystenta. W 1997 roku uzyskała stopień doktora nauk ekonomicznych na WZiE, a w 2006 doktora habilitowanego nauk ekonomicznych w dyscyplinie nauki o zarządzaniu,...

• Greedy Multipoint Model-Order Reduction Technique for Fast Computation of Scattering Parameters of Electromagnetic Systems

  Publikacja

  • M. Rewieński
  • A. Lamęcki
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Rok 2016

  This paper attempts to develop a new automated multipoint model-order reduction (MOR) technique, based on matching moments of the system input–output function, which would be suited for fast and accurate computation of scattering parameters for electromagnetic (EM) systems over a wide frequency band. To this end, two questions are addressed. Firstly, the cost of the wideband reduced model generation is optimized by automating a...

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• Polynomial Chaos Expansion in Bio-and Structural Mechanics

  Publikacja

  • K. Szepietowska

  - Rok 2022

  This monograph presents a probabilistic approach to modelling the mechanics of materials and structures where the modelled performance is influenced by uncertainty in the input parameters. The work is interdisciplinary and the methods described are applied to medical and civil engineering problems. The motivation for this work was the necessity of mechanics-based approaches in the modelling and simulation of implants used in the...

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