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Wyświetlanie 1-10 z 4744
Tytuł:
The Challenges of Incorporating Realistic Simulations of Marine Protists in Biogeochemically Based Mathematical Models
Autorzy:
Davidson, Keith
Powiązania:
https://bibliotekanauki.pl/articles/763796.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Mathematical modelling, protists, NPZD models, PFT models, trait based models, IBM models
Opis:
Protists are key components of marine microbial communities and hence of the biogeochemical mathematical models that are used to study the interaction between organisms, and the associated cycling of carbon and other nutrients. With increased computing power, models of microbial communities have markedly increased in complexity in the last 20 years, from relatively simple single nutrient currency, nutrient-phytoplankton-zooplankton-detritus (NPZD) models to plankton functional type (PFT) or trait based models of multiple organisms, or individual based models (IBMs) of specific organisms. However, our recognition, if not parameterisation, of the physiological processes that underpin both autotrophic and heterotrophic protist nutrition and growth arguably have increased faster than our modelling capability, generating a wealth of new modelling challenges. This paper therefore reviews historical development, current capability, and the future directions and challenges in protist based mathematical modelling.
Źródło:
Acta Protozoologica; 2014, 53, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orthogonal models: Algebraic structure and explicit estimators for estimable vectors
Autorzy:
Pereira, Artur
Fonseca, Miguel
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729750.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
linear models
mixed models
inference
orthogonal models
UBLUE
Opis:
We study the algebraic structure of orthogonal models thus of mixed models whose variance covariance matrices are all positive semi definite, linear combinations of known pairwise orthogonal projection matrices, POOPM, and whose least square estimators, LSE, of estimable vectors are best linear unbiased estimator, BLUE, whatever the variance components, so they are uniformly BLUE, UBLUE. From the results of the algebraic structure we will get explicit expression for the LSE of these models.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 29-44
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical analysis of underground coal gasification models. Part II: Kinetic and computational fluid dynamics models. Literary studies and comparison of models
Autorzy:
Żogała, A.
Powiązania:
https://bibliotekanauki.pl/articles/91950.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal gasification
kinetic models
CFD models
zgazowanie węgla
model kinetyczny
model CFD
Opis:
Purpose Underground coal gasification, as a complex and technically difficult process, in many aspects requires the support provided by computer simulations. There are a lot of mathematical models of UCG, some of them are concentrated with the forecast of syngas composition. The most important may be divided into three groups: equilibrium, kinetic and CFD models. The purpose of this work was the detailed critical analysis of more advanced approaches (than equilibrium considerations) applied in simulations of the coal conversion process – both kinetic and based on computational fluid dynamics. The other aim of this paper was the comparative analysis of the most important models of underground coal gasification. Methods Literary studies, concerned with the features and mathematical description of kinetic and CFD models of coal gasification, were used as the research method applied in the work presented. Compilation of the kinetic parameters of gasification reactions was an important part of this article. For that purpose the analysis of Polish and foreign papers, monographs and university handbooks was undertaken. Results Critical analysis of kinetic and CFD models of coal gasification (together with their mathematical formulation) was the result of considerations presented in this article. Kinetic equations were shown separately for pyrolysis, homogenous and heterogeneous reactions. In the case of CDF models, except for the presentation of the conservation equation, the most important methods of modeling turbulence are described (for the reason that this phenomenon may have significant inflence on the final results). Practical implications The work presented describes practical issues connected with kinetic and CFD models, focusing on their capabilities, drawbacks and possible application problems. Originality/ value This paper presents state of art in the field of coal gasification modeling using kinetic and computational fluid dynamics approach. The paper also presents own comparative analysis (concerned with mathematical formulation, input data and parameters, basic assumptions, obtained results etc.) of the most important models of underground coal gasification.
Źródło:
Journal of Sustainable Mining; 2014, 13, 1; 29-37
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The value-based paradigm and economization of company strategy and business models
Autorzy:
Jabłoński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/916180.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
business models strategy
business models
Opis:
The business processes’ constantly increasing dynamic occurred in companies forces them not only to create their new business models and strategies, but first of all to achieve appropriate profits. The aim of this paper is to discuss the role of business models strategy and economization, using the value-based paradigm. The author argues that currently designed business models and strategies should generate defined measurable financial results, at every stage of their implementation suitable to program them. Therefore, the application of such business models and strategies enables for an enterprise’s value increasing at its business development every stage.
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2014, 33, 4; 37-45
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele pracy edukacyjnej z ludźmi dorosłymi
Models of educational work with adult people
Autorzy:
Oleszak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/443175.pdf
Data publikacji:
2011
Wydawca:
ADVSEO
Tematy:
MODELS OF SPECIALIZED EDUCATION
MODELS OF EDUCATIONAL WORK WITH ADULT PEOPLE
MODELS OF CURRICULUM
Opis:
Three models of educational work with adult people – technological, humanistic, and critical – distinguished by andragogists are presented in the paper. Educational practice, practice of adults education in particular is described. Possible distortions from knowledge coming from everyday life and common experience of people are shown.
Źródło:
General and Professional Education; 2011, 1; 35-42
2084-1469
Pojawia się w:
General and Professional Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Believable world of economic models
Autorzy:
Gorazda, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/691074.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
economic models
philosophy of economics
Opis:
Book review: Łukasz Hardt, Economics Without Laws. Towards a New Philosophy of Economics, Palgrave Macmillan, Cham, 2017, pp. 220.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 67; 251-261
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Income tax: a comparison of the forecasting methodologies
Autorzy:
Pavlik, Martin
Powiązania:
https://bibliotekanauki.pl/articles/425078.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
income tax
forecasting
ARCH models
GARCH models
EGARCH models
Akaike information criteria
Opis:
The author focuses on income tax forecasting. He compares the different forecasting methodologies. He also compares his solution to the official annual forecasts in the Slovak Republic. He chose the quarters of years as the time units.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 3(41); 104-112
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using MathCad environment to calculate leakage currents and power basis on percolation models
Autorzy:
Frączak, P.
Powiązania:
https://bibliotekanauki.pl/articles/97207.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
percolation
percolation models
calculations of percolation models
in Mathcad
Opis:
This work presents the design and analysis of percolation models for branches and nodes in networks created using electric circuits. Electric circuits were built using square networks consisting of appropriate resistance and impedance elements, as well as of power supply sources. The created percolation models were described mathematically, according to the Maxwell matrix method of cyclic current in the classical form and in the complex number form. Analytical descriptions of electric circuits include random methods of "short-circuiting" branches and creation of “filled” nodes, respectively, in the networks using appropriate calculation procedures in Mathcad. Simulation calculations of surface leakage current for a polymer sample were made using a model of its surface (percolation for a branch in the network) and a numerical program developed on the basis of calculation procedures contained in Mathcad. On the other hand, simulation calculations of power emitted on the surface of a cylindrical insulator performed using its surface model (percolation for nodes in the network) and a numerical program written in the Mathcad environment.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 255-267
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 4744

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