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    Wyświetlanie 1-13 z 13
    Tytuł:
    Application of a Logistic Function to Describe the Growth of Fodder Galega
    Autorzy:
    Rymuza, K.
    Bombik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/123385.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    oriental goat’s rue
    logistic function
    growth equation
    growth rate equation
    growth rate
    Opis:
    It was attempted in the paper to describe the growth of oriental goat’s rue (Galega orientalis Lam.) growth by means of a logistic function. The studies demonstrated that the function describes empirical data well as the coefficients of determination obtained ranged between 97 to 98%, depending on the growing season. The estimated function parameters indicate that both the plant height and growth rate were conditioned by thermal conditions and moisture during the growing season. Plants had the longest stems in the year 2010 (127.9 cm), and the shortest in 2008 (105.9 cm). The maximum growth rate ranged from 2.12 to 3.97 cm per day in, respectively, 2009 and 2008. Also the inflection point, the point at which plants grew the fastest, depended on the conditions of the growing season.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 1; 125-131
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamics of irreversible plant cell growth
    Autorzy:
    Pietruszka, M
    Lewicka, S.
    Pazurkiewicz-Kocot, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/58662.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    thermodynamics
    irreversible process
    plant cell
    plant growth
    cell wall
    yielding
    growth stimulator
    growth inhibitor
    modified growth equation
    Opis:
    The time-irreversible cell enlargement of plant cells at a constant temperature results from two independent physical processes, e.g. water absorption and cell wall yielding. In such a model cell growth starts with reduction in wall stress because of irreversible extension of the wall. The water absorption and physical expansion are spontaneous consequences of this initial modification of the cell wall (the juvenile cell vacuolate, takes up water and expands). In this model the irreversible aspect of growth arises from the extension of the cell wall. Such theory expressed quantitatively by time-dependent growth equation was elaborated by Lockhart in the 60's.The growth equation omit however a very important factor, namely the environmental temperature at which the plant cells grow. In this paper we put forward a simple phenomenological model which introduces into the growth equation the notion of temperature. Moreover, we introduce into the modified growth equation the possible influence of external growth stimulator or inhibitor (phytohormones or abiotic factors). In the presence of such external perturbations two possible theoretical solutions have been found: the linear reaction to the application of growth hormones/abiotic factors and the non-linear one. Both solutions reflect and predict two different experimental conditions, respectively (growth at constant or increasing concentration of stimulator/inhibitor). The non-linear solution reflects a common situation interesting from an environmental pollution point of view e.g. the influence of increasing (with time) concentration of toxins on plant growth. Having obtained temperature modified growth equations we can draw further qualitative and, especially, quantitative conclusions about the mechanical properties of the cell wall itself. This also concerns a new and interesting result obtained in our model: We have calculated the magnitude of the cell wall yielding coefficient (T) [m3 J-1•s-1] in function of temperature which has acquired reasonable numerical value throughout.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2006, 75, 3; 183-190
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonhomogeneous equations with critical exponential growth and lack of compactness
    Autorzy:
    Figueiredo, Giovany M.
    Radulescu, Vicentiu D.
    Powiązania:
    https://bibliotekanauki.pl/articles/255035.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    exponential critical growth quasilinear equation Trudinger-Moser inequality
    Moser iteration
    Opis:
    We study the existence and multiplicity of positive solutions for the following class of quasilinear problems [formula] where e∈ is a positive parameter. We assume that [formula] is a continuous potential and ƒ : R → R is a smooth reaction term with critical exponential growth.
    Źródło:
    Opuscula Mathematica; 2020, 40, 1; 71-92
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the Tumor---Immune System Competition---the Effect of Time Delay
    Autorzy:
    Gałach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/908151.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    medycyna
    matematyka
    mathematical model
    tumor growth
    differential equation
    time delay
    Opis:
    The model analyzed in this paper is based on the model set forth by V.A. Kuznetsov and M.A. Taylor, which describes a competition between the tumor and immune cells. Kuznetsov and Taylor assumed that tumor-immune interactions can be described by a Michaelis-Menten function. In the present paper a simplified version of the Kuznetsov-Taylor model (where immune reactions are described by a bilinear term) is studied. On the other hand, the effect of time delay is taken into account in order to achieve a better compatibility with reality.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 395-406
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the Jackson and Hunt Theory for Rapid Eutectic Growth
    Autorzy:
    Wołczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353984.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Jackson and Hunt theory
    diffusion equation
    coupled eutectic growth
    Aziz’s theory
    oscillatory mode of eutectic growth
    Opis:
    A development of the Jackson-Hunt’s theory is delivered. Contrary to Jackson-Hunt’s theory for ideally coupled growth the current description is dealing with the coupled eutectic growth which is more realistic than an ideal course of eutectic structure formation. Thus, the undercooling of every eutectic phase is not equal to each other. A new boundary condition is introduced to solve the diffusion equation. According to this condition, the eutectic concentration is always maintained at the triple point of the solid / liquid (s/l) interface. Therefore, the solution to diffusion equation is given separately for both lamellae. The mass balance is satisfied by the current solution. Both thermodynamic equilibrium and mechanical equilibrium are assumed to be situated at the triple point of the s/l interface, only. A protrusion of the leading phase over the wetting phase is defined mathematically due to the mass balance fulfilment. The current description is associated with the asymmetrical phase diagrams. Finally, the current description is applied to interpretation of the rapid eutectic growth. Therefore, Aziz’s concept for the changes of partition ratio versus growth rate is introduced into the description. As a result, the rapid formation of the eutectic structure is described by the oscillatory mode. Interpretation of the oscillatory mode of the eutectic structure formation is illustrated in the arbitrary eutectic phase diagram. The eutectic structure, obtained through the detonation gas spraying onto the steel substrate (rapid solidification) is delivered to illustrate the present description.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 65-72
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elementary examples of Loewner chains generated by densities
    Autorzy:
    Sola, Alan
    Powiązania:
    https://bibliotekanauki.pl/articles/747081.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Loewner equation
    starlike functions
    absolutely continuous driving measures
    growth processes
    corners and cusps.
    Opis:
    We study explicit examples of Loewner chains generated by absolutely continuous driving measures, and discuss how properties of driving measures are reflected in the shapes of the growing Loewner hulls.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2013, 67, 1
    0365-1029
    2083-7402
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of warmness and spatial nonuniformity of plasma waveguide on periodic absolute parametric instability
    Autorzy:
    Zaki, N. G.
    Bekheit, A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/147605.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    periodic absolute parametric instability (API)
    low frequency waves
    warm plasma
    growth rate
    dispersion equation
    Opis:
    The periodic absolute parametric instability (API) of the low-frequency oscillations excited by a monochromatic pumping field of an arbitrary amplitude in a warm 1-D (one-dimensional) nonuniform magnetoactive plasma is investigated. The separation method can be used for solving the two-fluid plasma equations describing the system. By applying this method we were able to determine the frequencies and growth rates of unstable modes and the self-consistent electric field. Plasma electrons are considered to have a thermal velocity. Different solutions for the spatial equation can be obtained the following cases: A) API in a uniform plasma, B) API in a nonuniform plasma. The latter has been studied here for two cases: B.1) the exact harmonic oscillator and B.2) the bounded harmonic oscillator (a bounded plasma). An increment has been found in the build-up of the oscillations, and it has been shown that the spatial nonuniformity of the plasma exerts the stabilizing effect on the parametric instability. A reduced growth rate of API in the warm plasma, in comparison to the cold plasma, is reported. It has also been found that the warmness of the plasma has no effect on the solution of the space part of the problem (only through the separation constant).
    Źródło:
    Nukleonika; 2011, 56, 4; 305-309
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efektywna podaż pracy a wzrost gospodarczy
    Effective Labor Supply and Economic Growth
    Autorzy:
    Florczak, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/574819.pdf
    Data publikacji:
    2008-12-31
    Wydawca:
    Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
    Tematy:
    effective labor supply
    human capital
    econometric model
    Mincer wage equation
    sustained economic growth
    supply-side growth factors
    demographic structure of the population
    Opis:
    The article discusses the relationship between effective labor supply-determined by factors that are linked either directly or indirectly with human capital-and sustained economic growth per capita. On the basis of an expanded Mincer wage equation, the author estimates effective labor supply, taking into account effects linked with human capital, and conducts an econometric analysis of changes in the average working time in Poland in 1970-2005. The author zeroes in on long-term relationships and checks the results of his analysis against a body of statistical data. The diagnostic tools used by the author include the Gauss-Markov theorem, a method for evaluating statistical errors developed by mathematicians Carl Friedrich Gauss and Andrey Markov. According to Florczak, standard labor supply analyses are often inaccurate because they overlook factors linked with working time, the quality of labor, and the overall social and demographic conditions. In an era of globalization, the author says, if it wants to maintain its international economic competitiveness, Poland should increase the role of “extensive” factors of production by boosting the economic activity of the population.
    Źródło:
    Gospodarka Narodowa. The Polish Journal of Economics; 2008, 228, 11-12; 21-46
    2300-5238
    Pojawia się w:
    Gospodarka Narodowa. The Polish Journal of Economics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinitely many solutions for some nonlinear supercritical problems with break of symmetry
    Autorzy:
    Candela, Anna Maria
    Salvatore, Addolorata
    Powiązania:
    https://bibliotekanauki.pl/articles/255401.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    quasilinear elliptic equation
    weak Cerami-Palais-Smale condition
    Ambrosetti-Rabinowitz condition break of symmetry
    perturbation method
    supercritical growth
    Opis:
    In this paper, we prove the existence of infinitely many weak bounded solutions of the nonlinear elliptic problem [formula], where [formula] is an open bounded domain, N ≥ 3, and [formula] are given functions, with[formula], such that A(x, •, •) is even and g(x, •) is odd. To this aim, we use variational arguments and the Rabinowitz's perturbation method which is adapted to our setting and exploits a weak version of the Cerami-Palais-Smale condition. Furthermore, if [formula] grows fast enough with respect to t, then the nonlinear term related to g(x,t) may have also a supercritical growth.
    Źródło:
    Opuscula Mathematica; 2019, 39, 2; 175-194
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social Responsibility, Internal Governance and Manufacturing Growth
    Odpowiedzialność społeczna, zarządzanie wewnętrzne a wzrost produkcji
    Autorzy:
    Cao, Y.
    You, J.
    Shi, Y.
    Hu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/371042.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
    Tematy:
    social responsibility
    internal governance
    manufacturing growth
    structural equation model
    odpowiedzialność społeczna
    zarządzanie wewnętrzne
    wzrost produkcji
    model równania strukturalnego
    Opis:
    This article presents a structural equation model for exploring the impact of social responsibility, which been divided into responsibility for the internal stakeholder and responsibility for the external stakeholder, as well as internal governance on Chinese manufacturing growth on the basis of data collected from 500 manufacturing enterprises in the East region of China. Our results show that both social responsibility and internal governance have a positive impact on manufacturing growth and promote sustainable development in manufacturing. In addition, social responsibility has a positive impact on internal governance, and the internal governance plays a partial intermediary role in the impact of social responsibility on manufacturing growth. These findings signify that it is important for Chinese Manufacturing to undertake Social Responsibility, and it can provide a beneficial guidance for Chinese Manufacturing Growth and help strengthen the competitive advantage of manufacturing industry.
    Artykuł przedstawia model równania strukturalnego odnoszący się do społecznej odpowiedzialności, wyróżniając w jej ramach odpowiedzialność za wewnętrznego oraz zewnętrznego akcjonariusza i wewnętrzne zarządzanie w kontekście wzrostu produkcji w Chinach, w oparciu o informacje uzyskane z 500 firm pochodzących ze wschodniej części kraju. Przeprowadzona analiza pokazuje, że zarówno społeczna odpowiedzialność, jak i wewnętrzne zarządzanie, mają pozytywny wpływ na wzrost produkcji i promocję zrównoważonego wytwarzania. Ponadto społeczna odpowiedzialność ma pozytywny wpływ na wewnętrzne zarządzanie, a w oddziaływaniu społecznej odpowiedzialności na wzrost produkcji, wewnętrzne zarządzane odgrywa po części rolę pośrednika. Uzyskane rezultaty wskazują, że społeczna odpowiedzialność jest ważna, może pełnić rolę dobrego doradcy w kontekście wzrostu chińskiej produkcji i pomóc w zwiększeniu konkurencyjnej przewagi dla przemysłu wytwórczego.
    Źródło:
    Problemy Ekorozwoju; 2017, 12, 1; 41-54
    1895-6912
    Pojawia się w:
    Problemy Ekorozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of entire solutions of some linear PDEs
    Autorzy:
    Bandura, A,
    Skaskiv, O.
    Filevych, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/122451.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    linear partial differential equation
    entire function
    bounded L-index in direction
    bounded l-index
    homogeneous linear differential equation
    growth of solutions
    liniowe równanie różniczkowe cząstkowe
    funkcja całkowita
    równanie różniczkowe cząstkowe
    Opis:
    In this paper, there are improved sufficient conditions of boundedness of the L-index in a direction for entire solutions of some linear partial differential equations. They are new even for the one-dimensional case and L≡1. Also, we found a positive continuous function l such that entire solutions of the homogeneous linear differential equation with arbitrary fast growth have a bounded l -index and estimated its growth.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 2; 17-28
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamiczne krzywe bonitacyjne dla sosny zwyczajnej (Pinus sylvestris L.) z południowej Polski
    Dynamic site index curves for Scots pine (Pinus sylvestris L.) in southern Poland
    Autorzy:
    Socha, J.
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/993955.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    bonitacja drzewostanow
    sosna zwyczajna
    Pinus sylvestris
    krzywe bonitacyjne
    Polska Poludniowa
    site index model
    base−age invariant dynamic equation
    height growth
    site productivity
    Opis:
    The aim of the study was to develop a site index model for Scots pine stands in southern Poland describing changes in height growth of stand's upper storey over time. The research material contained the height growth data obtained from an analysis of 189 tree stems. The collected material was used to develop the parameters of six dynamic growth equations which allowed to determine site productivity and predict changes in height growth of stands with age. Statistical criteria for assessing the accuracy of mapping empirical data and biological reasonableness were the basis of selection of the equation that best fits changes in height growth of the examined pine stands with age. The developed model can be used to predict the growth rate and determine the site index for Scots pine stands in southern Poland.
    Źródło:
    Sylwan; 2013, 157, 01; 26-38
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Krzywe bonitacyjne świerka pospolitego na siedliskach górskich
    Site index curves for Norway spruce on mountain habitats
    Autorzy:
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/973956.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    bonitacja siedliska
    modele bonitacyjne
    Picea abies
    leśnictwo
    drzewa leśne
    świerk pospolity
    góry
    siedliska leśne
    site index model
    base−age invariant dynamic equation
    height growth
    picea abies (l.) karst.
    Opis:
    The aim of the study was to develop a site index model for mountain spruce stands. The research material contained the height growth data obtained from stem analysis of 95 trees. The collected material was used to calculate the parameters of four dynamic growth equations, which allowed to determine site productivity and predict height growth based on age and height of stands. The equation that best describes the height growth of the examined spruces was selected from among different solutions using statistical criteria for assessing the accuracy of fitting empirical data and biological realism. The developed model can be used to predict the height growth and determine the site index for mountain spruce stands.
    Źródło:
    Sylwan; 2011, 155, 12; 816-826
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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