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Wyświetlanie 1-15 z 19
Tytuł:
Deterministic properties of serially connected distributed lag models
Autorzy:
Nowak, P.
Gadomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/406350.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
distributed lags
limit properties
characteristics of distributed lags
Opis:
Distributed lag models are an important tool in modeling dynamic systems in economics. In the analysis of composite forms of such models, the component models are ordered in parallel (with the same independent variable) and/or in series (where the independent variable is also the dependent variable in the preceding model). This paper presents an analysis of certain deterministic properties of composite distributed lag models composed of component distributed lag models arranged in sequence, and their asymptotic properties in particular. The models considered are in discrete form. Even though the paper focuses on deterministic properties of distributed lag models, the derivations are based on analytical tools commonly used in probability theory such as probability distributions and the central limit theorem.
Źródło:
Operations Research and Decisions; 2013, 23, 3; 43-55
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some properties of composite distributed lag models
Autorzy:
Gadomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/406631.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
economic modeling
distributed lags
lag distributions
Opis:
The analysis presented in this paper is focused on basic properties of discrete distributed lag models. Such models are commonly used to model dynamic systems in various applications. In the presented considerations, time-varying distributed lags have been analyzed. Composite distributed lag models analyzed in this paper result from the summation or superposition of component distributed lag models. The analysis is restricted to models with a lag distribution, whose mean lag and variance exist. The paper presents relationships between the mean values and variances of the lag distributions of composite distributed lag models and of the component distributed lag models, as well as the relationships between the variance of the random term of composite distributed lag models and the variance of the random term of the component distributed lag models.
Źródło:
Operations Research and Decisions; 2013, 23, 3; 5-22
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of loans in the Polish banking system
Autorzy:
Gadomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/969683.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
economic modeling
dynamics of loans
distributed lags
Opis:
At the macro level, the time-series of the amounts of loans granted (a flow) and repaid (a flow) to the banking system in each period are not available. The information on these flows is important in many analyses, such as the impact of the bank lending on investment outlays. However, one can get the information concerning the structure of loans (a stock variable) regarding their duration. In each period, the loans are granted for different periods: from overnight ones to those lasting several years. The effective preferences of the credit takers are reflected in the term distribution of the outstanding loans. In order to estimate these flows, a model aimed at linking the above-mentioned preferences, the levels of loans and flows has been developed. In the approach proposed, the amount of loans outstanding is a resultant of the rate of the new loans and their duration, which in turn is the result of the term preferences. The evaluation of the flow of loans granted in the Polish banking sector is presented.
Źródło:
Control and Cybernetics; 2009, 38, 3; 893-911
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extremal problems for parabolic systems with time-varying lags
Autorzy:
Kowalewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/229617.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boundary control
parabolic systems
time-varying lags
Opis:
Extremal problems for parabolic systems with time-varying lags are presented. An optimal boundary control problem for parabolic systems in which time-varying lags appear in the state equations and in the boundary conditions simultaneously is solved. The time horizon is fixed. Making use of Dubovicki-Milutin scheme, necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance functionals and constrained control are derived.
Źródło:
Archives of Control Sciences; 2018, 28, 1; 89-104
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical models of the air separation through polymer membranes at magnetic field
Autorzy:
Strzelewicz, A.
Grzywna, Z. J.
Powiązania:
https://bibliotekanauki.pl/articles/346951.pdf
Data publikacji:
2007
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
diffusion
membrane
time lags
gas mixtures
air separation
Opis:
This paper is addressed to the membrane air separation i.e. the gas mixture of quite similar gases in many respects, except one: oxygen is paramagnetic whereas nitrogen is diamagnetic. This fact forms the basis for their separation. The numerical studies and theoretical predictions concerning the air membrane separation in the presence of a magnetic field are discussed. Some experimental data concerning the „magnetic membranes” i.e. ethylcellulose membranes with neodymium powder, are also presented.
Źródło:
Ars Separatoria Acta; 2007, 5; 34-44
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pointwise observation of the state given by complex time lag parabolic system
Autorzy:
Kowalewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/229580.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed control
parabolic system
time lags
pointwise observation
Opis:
Various optimization problems for linear parabolic systems with multiple constant time lags are considered. In this paper, we consider an optimal distributed control problem for a linear complex parabolic system in which different multiple constant time lags appear both in the state equation and in the Neumann boundary condition. Sufficient conditions for the existence of a unique solution of the parabolic time lag equation with the Neumann boundary condition are proved. The time horizon T is fixed. Making use of the Lions scheme [13], necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance functional with pointwise observation of the state and constrained control are derived. The example of application is also provided
Źródło:
Archives of Control Sciences; 2017, 27, 1; 77-89
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-temperature theory for a heated semi-infinite solid by a pulsed laser radiation
Autorzy:
Zenkour, Ashraf M.
Abouelregal, Ahmed E.
Powiązania:
https://bibliotekanauki.pl/articles/240137.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelasticity
two-temperature
non-Gaussian laser pulse
laser intensity
phase lags
Opis:
In this paper, the two-temperature thermoelasticity model is proposed to a specific problem of a thermoelastic semi-infinite solid. The bounding plane surface of the semi-infinite solid is considered to be under a non-Gaussian laser pulse. Generalized thermoelasticity analysis with dual-phase-lags is taken into account to solve the present problem. Laplace transform and its inversion techniques are applied and an analytical solution as well as its numerical outputs of the field variables are obtained. The coupled theory and other generalized theory with one relaxation time may be derived as special cases. Comparison examples have been made to show the effect of dual-phase-lags, temperature discrepancy, laser-pulse and laser intensity parameters on all felids. An additional comparison is also made with the theory of thermoelasticity at a single temperature.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 85-101
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Refined multi-phase-lags theory and Thomson effect on a micropolar thermoelastic medium with voids
Autorzy:
Alharbi, Amnah M.
Abd-Elaziz, Elsayed M.
Othman, Mohamed I.A.
Powiązania:
https://bibliotekanauki.pl/articles/1955005.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micropolar
voids
refined-phase-lags theory
thomson effect
normal mode
analysis
Opis:
The problem considered is that of an isotropic, micropolar thermoelastic medium with voids subjected to the Thomson effect. The solution to the problem is presented in the context of the refined multiphase-lags theory of thermoelasticity. The normal mode analysis was used to obtain the analytical expressions of the considered variables. The nondimensional displacement, temperature, microrotation, the change in the volume fraction field and stress of the material are obtained and illustrated graphically. The variations of these quantities have been depicted graphically in the refined-phase-lag theory, Green and Naghdi theory of type II, Lord and Shulman theory and a coupled theory. The effects of the Thomson parameter and phase lag parameters on a homogeneous, isotropic, micropolar thermoelastic material with voids are revealed and discussed. Some particular cases of interest are deduced from the present investigation.
Źródło:
Archives of Thermodynamics; 2021, 42, 3; 279--309
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-optimal boundary control of a parabolic system with time lags given in integral form
Autorzy:
Kowalewski, A.
Krakowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/908398.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie optymalne czasowo
system paraboliczny
opóźnienie
time-optimal boundary control
parabolic system
time lags
Opis:
In this paper, the time-optimal boundary control problem for a distributed parabolic system in which time lags appear in integral form in both the state equation and the boundary condition is presented. Some particular properties of optimal control are discussed.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 3; 287-295
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tax revenue and economic growth in developing country: an autoregressive distribution lags approach
Autorzy:
Maganya, Mnaku Honest
Powiązania:
https://bibliotekanauki.pl/articles/1356329.pdf
Data publikacji:
2020-11-20
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
Tematy:
taxation
economic growth
foreign direct investment
domestic investment
ADF test
autoregressive distributive lags model
Opis:
Tanzania, like most other developing countries, faces numerous economic challenges in striving to achieve sustainable economic growth and development through taxation. In the literature, the debate on how effective taxes are as a tool for promoting economic growth and economic development remains inconclusive, as various research have reported mixed effects of tax on economic growth. This article investigates the effect of taxation on economic growth in Tanzania using the recently developed technique of autoregressive distributed lag model (ARDL) bounds testing procedure for the period from 1996 to 2019. Various preliminary tests were conducted including stationary tests as well as the pair-wise Granger causality test. According to the results obtained, domestic goods and services (TGS) taxes are positively related to GDP growth and are statistically significant at 1% level. Income taxes, on the other hand, were found to be negatively related to GDP growth and to be statistically significant at 5% level. The pair-wise Granger causality results indicated that there is bidirectional Granger causality between TGS and GDP growth at 1 % significance level. The government should aim at growing, nurturing and sustaining tax base to positively drive economic growth even further.
Źródło:
Central European Economic Journal; 2020, 7, 54; 205 - 217
2543-6821
Pojawia się w:
Central European Economic Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of landscape in local development strategies based on the community led local development approach. The case of Sicily
Autorzy:
Martorana, G. S.
Powiązania:
https://bibliotekanauki.pl/articles/107120.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydział Biologiczno-Rolniczy
Tematy:
LAGs
CLLD
multifunctionality
local development
landscape
rural policies
wielofunkcyjność
rozwój lokalny
krajobraz
polityka wiejska
Opis:
This paper moves from some recent researches dealing with participatory local development in Sicily2 based on strategic and partnership choices carried out by local communities through CLLD (Community Led Local Development). This article will analize the role of landscape in SSLTP (“Strategie di Sviluppo Locale di Tipo partecipativo”)3 as realized by the communities of the 22 Sicilian territorial areas dealing with rural development policies through the Leader approach.
Źródło:
Topiarius. Studia krajobrazowe; 2017, 5; 89-97
2449-9595
2543-926X
Pojawia się w:
Topiarius. Studia krajobrazowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Memory response on generalized thermoelastic medium in context of dual phase lag thermoelasticity with non-local effect
Autorzy:
Tiwari, R.
Saeed, A. M.
Kumar, R.
Kumar, A.
Singhal, A.
Powiązania:
https://bibliotekanauki.pl/articles/38694222.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
memory dependent derivative
time-delay
kernel function
non-local
continuum theory
dual phase lags
Opis:
Theory of non-local continuum is contemporary appraised and is found to be supplementary coherent to capture the impacts of each and every point of the material at its single point. The conviction of memory dependent derivative is also newly appraised and is observed to be more intuitionistic for predicting the realistic character of the real-world obstacles. Attractiveness of the belief of a memory dependent derivative lies in its unique properties such as its significant constituents – a kernel function and time-delay are freely selected according to the requirement of a problem. The present study comprises a new meticulous thermoelastic heat conduction model for the homogeneous, isotropic, thermoelastic half space medium concerning memory effects and non-local effects. Governing equations are constructed on the basis of the newly appraised non-local generalized theory of thermoelasticity with two phase lags in the frame of a memory dependent derivative. Exact analytical solutions of the physical fields such as dimensionless temperature, displacement as well as thermal stress are evaluated by using a suitable technique of the Laplace transform. Quantitative results are determined in a time-domain for different values of time by taking the numerical inversion of the Laplace transform. Noteworthy role of the constituents of the memory dependent derivative such as kernel function as well as time-delay factor has been scrutinized on the crucial field variables of the medium through computational outcomes. Moreover, the impact of non-local parameter is examined on the variations of field quantities through the quantitative results.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 69-88
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola małych miast w rozwoju lokalnym poprzez wdrażanie metody Leader na przykładzie województwa śląskiego
The role of small towns in local development through leader approach implementation - an example of the silesian voivodeship in Poland
Autorzy:
Surmacz, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/587858.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
LEADER
Małe miasta
Małe projekty
Rozwój lokalny
Województwo śląskie
LAGs,
Rural areas
Silesian Voivodeship
Small cities
Opis:
Celem niniejszego artykułu jest prezentacja zaangażowania małych miast województwa śląskiego we wdrażanie metody Leader oraz – za jej pośrednictwem – ich wpływu na rozwój lokalny. Założono, iż małe miasta posiadają potencjał instytucjonalno-organizacyjny pozwalający na aktywne angażowanie się w inicjatywy pobudzenia rozwoju lokalnego, także we współpracy z obszarami wiejskimi. W artykule zbadano zaangażowanie podmiotów miejskich w struktury LGD, lokalizację biura LGD oraz tematykę i beneficjentów projektów składanych w ramach Leadera w latach 2009-2013. Wyniki badań wskazały na dość ograniczone zaangażowanie małych miast w Leadera, a tym samym podały w wątpliwość jakość posiadanego przez nie potencjału instytucjonalnego.
Small towns can cooperate with rural areas through Leader approach (integral part of the UE rural development policy) as a method of enhancing their local development. It seems that the institutions which are created in small towns may potentially have better knowledge, competence and financial resources to address local needs using Leader projects. The main goal of this paper is to analyse the scope of small towns involvement in Leader in the Silesian Voivodeship in Poland. The majority of small towns (which meet the formal conditions) in the Silesian Voivodeship cooperate with rural areas in the implementation of Leader. In spite of this fact, the observed level of towns’ involvement is low, which may be a symptom of their limited role in the local development. Moreover it may also be a sign, that small towns in the Silesian Voivodeship do not have institutional and organizational potential, which could be used to play a more active role in stimulating local development.
Źródło:
Studia Ekonomiczne; 2016, 279; 141-149
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rural development between “institutional spaces” and “spaces of resources and vocations”: Park Authorities and LAGs in Sicily
Autorzy:
Falduzzi, C.
Martorana, G. S.
Powiązania:
https://bibliotekanauki.pl/articles/107031.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Wydział Biologiczno-Rolniczy
Tematy:
territorialisation
local development
LAGs
natural park
Participatory Local Development Strategies
terytorializacja
rozwój lokalny
park naturalny
strategie rozwoju
Opis:
This paper addresses the subject of the reference frames of territorialisation processes determined by local development initiatives. Its purpose is to offer a survey on a central issue: which spatial frames of reference influence or justify the choices of LAGs in the definition and delimitation of local development spaces. The paper is about the case of Sicily, presenting some possible interpretations of an evolution of the development space from “institutional space” to “space of resources and vocations”. The paper will highlight the relation between the spaces of natural parks and the spaces of LAGs in the Participatory Local Development Strategies.
Źródło:
Topiarius. Studia krajobrazowe; 2018, 6; 81-105
2449-9595
2543-926X
Pojawia się w:
Topiarius. Studia krajobrazowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extremal Problems for Infinite Order Parabolic Systems with Boundary Conditions Involving Integral Time Lags
Problemy ekstremalne dla parabolicznych systemów nieskończonego rzędu z warunkami brzegowymi, w których występują całkowe opóźnienia czasowe
Autorzy:
Kowalewski, Adam
Miśkowicz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2174238.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
boundary control
infinite order parabolic systems
integral time lags
sterowanie brzegowe
systemy paraboliczne nieskończonego rzędu
całkowe opóźnienia czasowe
Opis:
Extremal problems for integral time lag infinite order parabolic systems are studied in the paper. An optimal boundary control problem for distributed infinite order parabolic systems in which integral time lags appear in the Neumann boundary conditions is solved. Such equations constitute in a linear approximation a universal mathematical model for many diffusion processes (e.g., modeling and control of heat transfer processes). The time horizon is fixed. Using the Dubovicki-Milutin framework, the necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance indexes and constrained control are derived.
Zaprezentowano ekstremalne problemy dla systemów parabolicznych nieskończonego rzędu z całkowymi opóźnieniami czasowymi. Rozwiązano problem optymalnego sterowania brzegowego dla systemów parabolicznych nieskończonego rzędu, w których całkowe opóźnienia czasowe występują w warunkach brzegowych Neumanna. Tego rodzaju równania stanowią w liniowym przybliżeniu uniwersalny model matematyczny dla procesów dyfuzyjnych. Korzystając z metody Dubowickiego-Milutina wyprowadzono warunki konieczne i wystarczające optymalności dla problemu liniowo-kwadratowego.
Źródło:
Pomiary Automatyka Robotyka; 2022, 26, 4; 37--42
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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