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Wyświetlanie 1-15 z 38
Tytuł:
One boundary value problem including a spectral parameter in all boundary conditions
Autorzy:
Kabataş, Ayşe
Powiązania:
https://bibliotekanauki.pl/articles/29519516.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
boundary value problems
asymptotics
Green’s functions
Opis:
In this paper, asymptotic formulae for solutions and Green’s function of a boundary value problem are investigated when the equation and the boundary conditions contain a spectral parameter.
Źródło:
Opuscula Mathematica; 2023, 43, 5; 651-661
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of residential development and municipal greenery on the thermal conditions of the city gullies in Lublin
Autorzy:
Poręba, Ludwika
Siebielec, Grzegorz
Łopatka, Artur
Bartosiewicz, Beata
Kaczyński, Radosław
Stuczyński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2147957.pdf
Data publikacji:
2019-12-30
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
urbanisation
soil
soil functions
temperature
soil sealing
green areas
Opis:
Urbanization is a serious threat to the soil cover. It entailsthe process of soil sealing thereby limiting soil functions.The local climate is also affected – sealed areas absorb heat, thereforetemperature above them is increasing. It contributes to theformation of an urban heat island, which negatively affects thequality of human life. In the two surveyed gullies in Lublin, 35measurement points were located, in which two temperature sensorswere placed: one at a height of 1.5 m and the other in the soilat a depth of 0.15 m. The measurement points were located at differentdistances from the buildings (from 10 to 236 m in a straightline) and in the areas with different types of vegetation – trees,shrubs and grass. Research carried out in two gullies in Lublin revealedthat the differences in air temperature at various locationswere even 10 degrees Celsius depending on the distance from thebuildings, the type of plant cover and soil characteristics. Largetemperature variability could be observed even within a smallarea. The negative impact of buildings on the air temperature inthe city is eliminated by proper distribution of green areas, reducingthe temperature by up to 7 degrees Celsius. The process ofsoil sealing cannot be avoided. Therefore, land intended for urbanisationshould be used rationally. The spatial planning processshould take into account not only land for infrastructure but alsofor green areas to reduce negative impact of soil sealing on thequality of life of the residents.
Źródło:
Polish Journal of Agronomy; 2019, 39; 44-51
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Model of Three-Dimensional Ultrasonic Beam Interaction with an Immersed Plate
Autorzy:
Soucrati, H.
Chitnalah, A.
Aouzale, N.
Jakjoud, H.
Powiązania:
https://bibliotekanauki.pl/articles/177031.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic modeling
immersed plate
Gaussian beams decomposition
Green’s functions
NDUT
Opis:
This paper proposes an analytical model to describe the interaction of a bounded ultrasonic beam with an immersed plate. This model, based on the Gaussian beams decomposition, takes into account multiple reflections into the plate. It allows predicting three-dimensional spatial distributions of both transmitted and reflected fields. Thereby, it makes it easy to calculate the average pressure over the receiver’s area taking into account diffraction losses. So the acoustical parameters of the plate can be determined more accurately. A Green’s function for the interaction of an ultrasonic beam with the plate is derived. The obtained results are compared to those given by the angular spectrum approach. A good agreement is seen showing the validity of the proposed model.
Źródło:
Archives of Acoustics; 2018, 43, 4; 669-679
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potencjał integracji form roślinnych z architekturą – kultura i społeczeństwo metropolii
The Potential of Integrating Plants into Architecture – Culture and Society of the Metropolis
Autorzy:
Zinowiec-Cieplik, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/509405.pdf
Data publikacji:
2018
Wydawca:
Akademia Finansów i Biznesu Vistula
Tematy:
zielona architektura
funkcje i potencjał zieleni
green architecture
greeneries’ functions and potential
Opis:
Współczesne formy integracji struktur architektonicznych z roślinnością ujawniają coraz większe zróżnicowanie pod każdym względem zarówno formalnym, jak i funkcjonalnym. Hybrydom roślinno- architektonicznym stawia się coraz większe wymagania i wyższe cele – mają nie tylko nie szkodzić, ale też wspierać środowisko w znaczeniu zarówno przyrodniczym, jak i społecznym. Zieleń zintegrowana z dachami oraz elewacjami pełni wielorakie funkcje – pożądane zwłaszcza w centrach dużych metropolii – przede wszystkim ekologiczne (środowiskowe) oraz wpierające/symbiotyczne, które bezpośrednio wpływają na przestrzeń życia. Okazuje się, że równie istotne stają się jej role społeczne i kulturowe.
Contemporary forms of integration of architectural structures with vegetation reveal more and more diversification in every respect, both formal and functional. Plant-and-architectural hybrids have to face more demanding and higher goals – they cannot be only neutral for nature but should support the environment, in a social sense too. Greenery integrated with roofs and facades has many functions – especially in the metropolises centers – primarily ecological (environmental) and supporting /symbiotic, which directly affect the living space. It turns out that its social and cultural roles become equally important. The research for a sustainable and resistant urban environment is developing very rapidly today. Greenery is one of the most important studies’ objects. The integral role of nature in shaping the conditions of healthy living environment is unquestionable actually. The history of the contemporary idea of green architecture, including the plants’ integration with buildings, dates back to the twentiethcentury modernist conception filtered by the ecological movement of the 1960s. Initially, formal and technological possibilities were sought for integrating plants with architecture. Nowadays, plant-andarchitecture hybrids set higher goals – they not only do harm but support the environment. Greenery integrated with roofs and facades performs multiple functions, primarily environmental, social and cultural, and supportive/symbiotic to the architectural form itself. The potential of plant-and-architecture hybrids is increasing, especially in the downtown – in the areas of intensive development.
Źródło:
Zeszyty Naukowe Uczelni Vistula; 2018, 61(4) Architektura; 139-150
2353-2688
Pojawia się w:
Zeszyty Naukowe Uczelni Vistula
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagators in quantum mechanics
Autorzy:
Hernández-Galeana, A.
Rivera-Rebolledo, J.
López-Bonilla, J.
López-Vázquez, R.
Powiązania:
https://bibliotekanauki.pl/articles/1177837.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Green’s functions
Propagators in quantum mechanics
Opis:
We consider one-dimensional non-relativistic quantum mechanics to exhibit that the propagators (Green’s functions) for free particle, linear potential and harmonic oscillator, are obtainable from purely classical means.
Źródło:
World Scientific News; 2018, 99; 249-253
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
POTENCJAŁ INTEGRACJI FORM ROŚLINNYCH Z ARCHITEKTURĄ – ŚRODOWISKO I TECHNIKA
Potential of Plant Integration with Architecture – Environment and Technology
Autorzy:
Zinowiec-Cieplik, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/439555.pdf
Data publikacji:
2017
Wydawca:
Akademia Finansów i Biznesu Vistula
Tematy:
zielona architektura
zielone dachy
zielone elewacje
ogrody wertykalne
funkcje i potencjał zieleni
green architecture
green roof
green façade
vertical garden
greenery potential and functions
Opis:
Współczesne poszukiwania zrównoważonego i trwałego miejskiego środowiska są bardzo intensywnie. Zieleń staje się jednym z ważniejszych obiektów badawczych. Integralna rola natury w kształtowaniu warunków zdrowego życia jest niepodważalna. Historia współczesnej idei zielonej architektury, w tym integracji form roślinnych z budynkami, sięga XX-wiecznych idei modernistycznych przefiltrowanych przez ruch ekologiczny lat 60. Potencjał hybryd roślinno-architektonicznych wzrasta, zwłaszcza w przestrzeniach intensywnej śródmiejskiej zabudowy.
The contemporary research for a sustainable and resilient urban environment is developing very rapidly. Greenery is one of the most important objects of study. The integral role of nature in shaping the conditions of a healthy life is unquestionable. The history of modern green architecture, including plants’ integration with buildings, dates back to the twentiethcentury modernist ideas filtered by the ecological movement of the 1960s. The potential of architectural-plant hybrid forms is increasing, especially in the areas of intensive urban development in city centres.
Źródło:
Kwartalnik Naukowy Uczelni Vistula; 2017, 4(54); 128-141
2084-4689
Pojawia się w:
Kwartalnik Naukowy Uczelni Vistula
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan, znaczenie i zagrożenia terenów zieleni w metropolii i jej otoczeniu
State, significance and threat of green areas in the central part of the metropolitan area
Autorzy:
Korwel-Lejkowska, Barbara
Czochański, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/570200.pdf
Data publikacji:
2017
Wydawca:
Instytut Metropolitalny
Tematy:
miejskie tereny zieleni,
zagrożenia,
funkcje zieleni,
dostępność parków miejskich, jakość życia w mieście
urban green space,
threats,
functions of greenery,
accessibility of urban parks,
life quality in the city
Opis:
Tereny zieleni pełnią szereg funkcji niezbędnych do prawidłowego funkcjonowania miasta, a przede wszystkim decydują o jakości życia jego mieszkańców. W artykule przedstawiono historyczne i aktualne tendencje w kształtowaniu terenów zieleni w mieście, przyczyny i skutki zmian ich powierzchni oraz uwagi o dostępności parków miejskich dla mieszkańców. Podano również główne zagrożenia istnienia parków w przestrzeni miasta
Green areas create one of the most important component of the city, because they play important rule for quality of citizen’s life. This paper presents historical and current trends in the shaping of green spaces in the city, causes and effects of changes in their area and an analysis of accessibility of urban parks. The main threats to the existence of parks in the urban space are also presented.
Źródło:
Metropolitan. Przegląd Naukowy; 2017, 2(8)
2353-7558
Pojawia się w:
Metropolitan. Przegląd Naukowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A methodology for online rotor stress monitoring using equivalent Green’s function and steam temperature model
Autorzy:
Banaszkiewicz, M.
Dominiczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/175458.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Steam turbine
thermal stress
Green's functions
Duhamel’s integral
Opis:
The requirement of high operational flexibility of utility power plants creates a need of using online systems for monitoring and control of damage of critical components, e.g., steam turbine rotors. Such systems make use of different measurements and mathematical models enabling calculation of thermal stresses and their continuous control. The paper presents key elements of the proposed system and discusses their use from the point of view of thermodynamics and heat transfer. Thermodynamic relationships, well proven in design calculations, were applied to calculate online the steam temperature at critical locations using standard turbine measurements as input signals. The model predictions were compared with operational data from a real power plant during a warm start-up and show reasonably good accuracy. The effect of variable heat transfer coefficient and material properties on thermal stresses was investigated numerically by finite element method (FEM) on a cylinder model, and a concept of equivalent Green’s function was introduced to account for this variability in thermal stress model based on Duhamel’s integral. This approach was shown to produce accurate results for more complicated geometries by comparing thermal stresses at rotor blade groove computed using FEM and Duhamel’s integral.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 13-37
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of continental hydrosphere loading using GNSS measurements
Autorzy:
Zygmunt, M.
Rajner, M.
Liwosz, T.
Powiązania:
https://bibliotekanauki.pl/articles/106899.pdf
Data publikacji:
2016
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
load Love numbers
Green's functions
WGHM
GNSS
crustal deformation
liczby Love'a
parametry sprężystości Ziemi
funkcja Greena
deformacja skorupy
Opis:
Presented paper is dedicated to problems of deformation of the Earth's crust as a response to the surface loading caused by continental waters. The aim of this study was to specify areas particularly vulnerable to studied deformation and to compare calculated and observed displacements. Information of the continental water volume was taken from the WaterGAP Global Hydrological Model. Calculated values of the deformations were verified with the results obtained with programs SPOTL and grat. Vertical deformations were almost 10 times higher than the deformation in the horizontal plane, for which reason later part of the paper focuses on the former. In order to check agreement of the calculated and observed deformation 23 stations of International GNSS Service (IGS) were selected and divided into three groups (inland, near the shoreline and islands). Before comparison outliers and discontinuities were removed from GNSS observations. Modelled and observed signals were centred. The analysed time series of the vertical displacements showed that only for the inland stations it is possible to effectively remove displacements caused by mass transfer in the hydrosphere. For stations located in the coastal regions or islands, it is necessary to consider additional movement effects resulting from indirect ocean tidal loading or atmosphere loading.
Źródło:
Reports on Geodesy and Geoinformatics; 2016, 101; 36-53
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage identification of a beam with a variable cross-sectional area
Autorzy:
Cekus, D.
Miara, M.
Zamorska, I.
Powiązania:
https://bibliotekanauki.pl/articles/122916.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
Bernoulli-Euler beam
crack
damage
free vibration
Green's functions
identification
vibration method
teoria Bernoulliego-Eulera
belka wspornikowa
funkcja Greena
pęknięcie
drgania swobodne
Opis:
In the paper, the process of identification of crack parameters occurring in the cantilever beam with the variable cross-sectional area has been presented. For identification, the non-destructive vibration method has been applied. The analytical solution of the free vibration problem of the beam described according to the Bernoulli-Euler theory has been obtained with the help of Green’s functions.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 4; 23-32
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and boundary behavior of positive solutions for a Sturm-Liouville problem
Autorzy:
Masmoudi, S.
Zermani, S.
Powiązania:
https://bibliotekanauki.pl/articles/255357.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
nonlinear Sturm-Liouville problem
Green's functions
positive solutions
Karamata regular variation theory
Opis:
In this paper, we discuss existence, uniqueness and boundary behavior of a positive solution to the following nonlinear Sturm-Liouville problem [formula] where [formula], A is a positive differentiable function on (0,1) and a is a positive measurable function in (0,1) satisfying some appropriate assumptions related to the Karamata class. Our main result is obtained by means of fixed point methods combined with Karamata regular variation theory.
Źródło:
Opuscula Mathematica; 2016, 36, 5; 613-629
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green’s function approach to frequency analysis of thin circular plates
Autorzy:
Żur, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/201838.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
free vibration
circular plates
Green's functions
wolne wibracje
funkcja Greena
Opis:
The free vibration analysis of homogeneous and isotropic circular thin plates by using the Green’s functions is considered. The formulae for construction of the influence function for all nodal diameters are presented in a closed form. The limited independent solutions of differential Euler equations were expanded in the Neumann power series using the method of successive approximation. This approach allows to obtain the analytical frequency equations as power series rapidly convergent to exact eigenvalues for different number of nodal diameters. The first ten dimensionless frequencies for eight different natural modes of circular plates are calculated. A part of obtained results have not been presented yet in open literature for thin circular plates. The results of investigation are in good agreement with selected results obtained by other methods presented in literature.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 181-188
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green’s function for a multifield material with a heat source
Autorzy:
Rogowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/279505.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Green's functions
point heat source
multifield material
magneto-electro-thermo-elastic fundamental solution
multifield composites
exact solution
Opis:
Green’s functions for a multifield material subjected to a point heat source are presented in an explicit analytical form. The study concerns the steady-state thermal loading infi- nite region, half-space region and two-constituent magneto-electro-thermo-elastic material region. The new mono-harmonic potential functions, obtained by the author, are used in the analysis. The elastic displacement, electric potential, magnetic potential and induced by those coupled multifield physical quantities, caused by internal or external heat sources, are limited and presented in a very useful form, exactly and explicitly.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 743-755
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the construction of two-sided approximations to positive solutions of some elliptic problem
Autorzy:
Kolosova, S.
Lukhanin, V.
Powiązania:
https://bibliotekanauki.pl/articles/411231.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
two-sided approximations
operator equation
positive solution
concave operator
conical interval
Green's functions
Green's quasifunction
Opis:
In this paper we have investigated the existence, uniqueness and possibility of constructing of two-sided approximations to the positive solution of a heat conduction problem with two sources. The investigation is based on methods in operator equations theory in half-ordered spaces. In this case we have considered a nonlinear operator equation that corresponds to the initial boundary value problem in a cone of non-negative continous functions. The properties of the corresponding operator define conditions which provide the existence and uniqueness of the solution. The conditions link the parameters of the problem implicitly meaning that they don’t provide the range of allowed values but need to be verified for each specific parameters value set separately. During the investigation we have provided the scheme of a two-sided iteration process which must satisfy the conditions in order to converge to the positive solution from both sides. The computational experiment have been conducted in two domains – unit disk and unit half disk. We have applied both two-sided approximations method and Green’s quasifunction method for the problem solving. The obtained results are presented as a surface and level lines plots and also as a table. The results in corresponding domains obtained by different methods have been compared with each other.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 4; 11-19
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis of composite circular and annular membranes
Autorzy:
Siedlecka, U.
Zamorska, I.
Kukla, S.
Powiązania:
https://bibliotekanauki.pl/articles/122423.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
composite membrane
free vibration
Green's functions
membrana kompozytowa
wolne wibracje
funkcja Greena
Opis:
In this paper a solution to the free vibration problem of composite circular and annular membranes is presented. The vibrations of membranes whose material densities and/or thicknesses varied step-wise with the radial co-ordinate are considered. This approach is applied to approximate the solution to the vibration problem of a membrane with continuously varying density and/or thickness with the radial co-ordinate. The obtained analytical solutions are used in numerical investigations into the effect of parameters characterizing the composite membranes on their eigenfrequencies.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 149-159
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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