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Wyświetlanie 1-15 z 139
Tytuł:
On the Möbius invariant principal functions of Pincus
Autorzy:
Ghosh, Sagar
Misra, Gadadhar
Powiązania:
https://bibliotekanauki.pl/articles/29519754.pdf
Data publikacji:
2024
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
hyponormal operators
multiplicity
trace formula
homogeneous operators
principal function
Opis:
In this semi-expository short note, we prove that the only homogeneous pure hyponormal operator T with rank (T∗T − TT∗) = 1, modulo unitary equivalence, is the unilateral shift.
Źródło:
Opuscula Mathematica; 2024, 44, 3; 391-407
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-point bending of a beam with non-homogeneous structure in the depth direction
Autorzy:
Magnucki, Krzysztof
Magnucka-Blandzi, Ewa
Witkowski, Dawid
Wittenbeck, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/38912690.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
non-homogeneous beam
shear deformation theory
three-point bending
Opis:
This paper is devoted to the behavior of a non-homogeneous simply supported beam under three-point bending. The individual shear deformation function of a planar cross-section is adopted, and longitudinal displacements, strains, and stresses for two parts of the beam are explained. By applying the principle of stationary potential energy, a system of two differential equations of equilibrium is derived and solved analytically. The positions of the neutral axis, shear coefficients, and deflections are then calculated for three different beam families. Additionally, the bending problem of these beams is studied numerically using the finite element method (FEM). The results of both analytical and numerical calculations are presented in tables and figures. The main contribution of this paper lies in the development of an analytical model incorporating the individual shear deformation function and a numerical FEM model for this beam.
Źródło:
Engineering Transactions; 2023, 71, 4; 645-665
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation of the MIMO Space Time Block Code Based Selective Decode and Forward Relaying Network over η–µ Fading Channel Conditions
Autorzy:
Shankar, Ravi
Raman, V. V. Raghava
Rane, Kantilal Pitamber
Sarojini, B. K.
Neware, Rahul
Powiązania:
https://bibliotekanauki.pl/articles/2058506.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
MIMO
MRC
non-homogeneous fading channel
PEP
S-DF
SNR
Opis:
In this paper, we examine the end-to-end average pairwise error probability (PEP) and output probability (OP) performance of the maximum ratio combining (MRC) based selective decode and forward (S-DF) system over an η–µ scattering environment considering additive white Gaussian noise (AWGN). The probability distribution function (PDF) and cumulative distribution function (CDF) expressions have been derived for the received signal-to-noise (SNR) ratio and the moment generating function (MGF) technique is used to derive the novel closed-form (CF) average PEP and OP expressions. The analytical results have been further simplified and are presented in terms of the Lauricella function for coherent complex modulation schemes. The asymptotic PEP expressions are also derived in terms of the Lauricella function, and a convex optimization (CO) framework has been developed for obtaining optimal power allocation (OPA) factors. Through simulations, it is also proven that, depending on the number of multi-path clusters and the modulation scheme used, the optimized power allocation system was essentially independent of the power relation scattered waves from the source node (SN) to the destination node (DN). The graphs show that asymptotic and accurate formulations are closely matched for moderate and high SNR regimes. PEP performance significantly improves with an increase in the value of η for a fixed value of µ. The analytical and simulation curves are in close agreement for medium-to-high SNR values.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 79--92
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical investigation of a beam on elastic foundation with nonsymmetrical properties
Autorzy:
Wstawska, Iwona
Magnucki, Krzysztof
Kędzia, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/38883579.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
homogeneous beam
elastic foundation
critical load
nonsymmetrical properties
Opis:
The subject of presented analytical and numerical investigation is the stability of an axially compressed beam on an elastic foundation. The shape function of the foundation was assumed. The formula was supplemented with the offset parameter. The critical values of loads were calculated and presented as a function of geometric and mechanical properties of the beam and nonsymmetrical properties of the elastic foundation. The highest values of critical loads can be obtained for the highest values of shape parameter and the lowest values of amplitudes of shape function. The values of critical loads increase with the increase of the value of the offset parameter.
Źródło:
Engineering Transactions; 2022, 70, 1; 77-93
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic Performance of Agriculture in the European Union Countries
Wyniki ekonomiczne w rolnictwie w krajach Unii Europejskiej
Autorzy:
Rađenović, Žarko
Krstić, Bojan
Marković, Milan
Powiązania:
https://bibliotekanauki.pl/articles/2130399.pdf
Data publikacji:
2022-03-28
Wydawca:
Instytut Ekonomiki Rolnictwa i Gospodarki Żywnościowej - Państwowy Instytut Badawczy
Tematy:
wskaźniki rolnicze
heterogeniczność rolnictwa europejskiego
homogeniczne grupy krajów
analiza klastrów
metoda Warda
agricultural indicators
heterogeneity of European agriculture
homogeneous country groups
cluster analysis
Ward’s method
Opis:
The aim of the research is to classify the European Union (EU) countries based on the progress in the economic performance of agriculture. The originality of the paper stems from the fact that a new set of indicators (in relative form) was used to identify the clusters. The following indicators are used to assess the economic performance of the EU agricultural sector (by cluster analysis) for two periods (2015–2017 and 2018–2020): total labor force input, real income of factors in agriculture per annual work unit, total agricultural output, gross value added of the agricultural industry, and animal output. The study confirmed that EU countries, according to changes in agricultural performance, differ significantly. They were grouped into four relatively homogeneous clusters according to their similarity, with a clear geographical dispersion for both analyzed periods. Identifying development disparities between EU countries can be useful in future redesigns of the Common Agricultural Policy measures in terms of increased support to certain members.
Celem badań jest klasyfikacja krajów Unii Europejskiej (UE) na podstawie postępu w wynikach ekonomicznych w rolnictwie. Oryginalność artykułu wynika z faktu, że do identyfikacji klastrów zastosowano nowy zestaw wskaźników (w postaci względnej). Do oceny wyników ekonomicznych sektora rolnego UE (poprzez analizę klastrów) dla dwóch okresów (2015–2017 i 2018–2020) stosuje się następujące wskaźniki: całkowity nakład siły roboczej, rzeczywisty dochód czynników w rolnictwie na roczną jednostkę pracy, produkcja rolna ogółem, wartość dodana brutto przemysłu rolnego oraz produkcja zwierzęca. Badanie potwierdziło, że kraje UE znacznie się różnią pod względem zmian wyników rolniczych. Zostały one pogrupowane w cztery stosunkowo jednorodne klastry według podobieństwa, z wyraźnym rozproszeniem geograficznym dla obu analizowanych okresów. Identyfikacja dysproporcji rozwojowych pomiędzy krajami UE może być przydatna w przyszłych przekształceniach środków wspólnej polityki rolnej pod kątem zwiększonego wsparcia dla niektórych członków.
Źródło:
Zagadnienia Ekonomiki Rolnej; 2022, 370, 1; 5-21
0044-1600
2392-3458
Pojawia się w:
Zagadnienia Ekonomiki Rolnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Edge homogeneous colorings
Autorzy:
Madaras, Tomáš
Onderko, Alfréd
Schweser, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/2048718.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
homogeneous coloring
Mq-coloring
line graph
role coloring
Opis:
We explore four kinds of edge colorings defined by the requirement of equal number of colors appearing, in particular ways, around each vertex or each edge. We obtain the characterization of graphs colorable in such a way that the ends of each edge see (not regarding the edge color itself) q colors (resp. one end sees q colors and the color sets for both ends are the same), and a sufficient condition for 2-coloring a graph in a way that the ends of each edge see (with the omission of that edge color) altogether q colors. The relations of these colorings to Mq-colorings and role colorings are also discussed; we prove an interpolation theorem for the numbers of colors in edge coloring where all edges around each vertex have q colors.
Źródło:
Opuscula Mathematica; 2022, 42, 1; 65-73
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature engineering in property markets homogenous areas determination procedures
Autorzy:
Renigier-Biłozor, Małgorzata
Janowski, Artur
Walacik, Marek
Chmielewska, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2191398.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie SILGIS
Tematy:
homogeneous area
property market analysis
robust geo-estimation
feature engineering
obszar jednorodny
analiza rynku nieruchomości
inżynieria cech
Opis:
Real estate is one of the most important aspect of our life and play significant role in global economy. Sooner or later, everyone has contact with properties that are place for life, work, investment, relax. That is why properties are part of many decision-making systems related to valuation, taxes, land planning and sustainable development of the areas. Analysis related to property market are based on many assumptions such as property homogeneity determination. The following paper presents proposal of utilization of automated solutions based on robust geo-estimation that enables high efficacy of property submarkets identification. The study is to propose the optimal solutions for initial part of the homogenous market analyses such as feature engineering, that enables unbiassed identification of the homogenous areas (zones). In this case the following methods based on robust geo-estimation/geoprocessing will be used: Gauss filter, geocoding and reverse geocoding, tessellation model and entropy theory.
Źródło:
GIS Odyssey Journal; 2022, 2, 1; 57--71
2720-2682
Pojawia się w:
GIS Odyssey Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized plane waves in a rotating thermoelastic double porous solid
Autorzy:
Pathania, Vijayata
Kumar, Rajesh
Gupta, Vipin
Barak, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/27312403.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
rotacja
fala płaska
termosprężystość
voids of type-I
voids of type-II
rotation
plane waves
homogeneous isotropic
generalized thermoelasticity
Opis:
The propagation of plane waves in a rotating homogeneous, isotropic, thermoelastic solid with double porosity following Lord-Shulman’s theory of thermoelasticity has been investigated. It is assumed that the medium rotates about an axis normal to the surface with a uniform angular velocity. There may exist five coupled waves that evolved due to the longitudinal, transverse disturbance, voids of type-I and type-II, and temperature change in the medium. The secular equation for the model under consideration has been derived with the help of formal solutions and boundary conditions. The amplitude of displacements, temperature change and volume fraction fields for voids of type-I and type-II have also been computed analytically. Finally, numerical computations have been carried out for magnesium crystal material to understand the behavior of amplitude of phase velocity, penetration depth, specific loss, displacement components, temperature change, and volume fraction field due to type-I and type-II voids corresponding to the different rotation rates. Various graphs have been plotted to support the analytical findings. The study may be used in the development of rotation sensors, material design and thermal efficiency.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 138--154
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odtajnione wynalazki z technologii ekranowania ładunków stałych, homogenicznych paliw rakietowych
Disclosed inventions on technologies screening solid, homogeneous rocket propellant charges
Autorzy:
Miszczak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2134915.pdf
Data publikacji:
2022
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
stałe
homogeniczne paliwa rakietowe
technologia ekranowania
polskie odtajnione patenty
solid
homogeneous rocket propellants
screening technology
Polish declassified patents
Opis:
W artykule przedstawiono rezultaty poszukiwań i analiz odtajnionych opisów patentowych polskich wynalazków z zakresu technologii ekranowania (inhibitowania) powierzchni ładunków stałych, homogenicznych paliw rakietowych. W wyniku poszukiwań w przedmiotowym zakresie znaleziono siedem opisów patentowych, z których zdjęto klauzulę tajności i ogłoszono o tym w Wiadomościach Urzędu Patentowego RP w latach 2007-2008. Wynalazki te w latach 1968- 1980 zostały zgłoszone przez Instytut Przemysłu Organicznego do Urzędu Patentowego.
Results of search and analysis of Polish disclosed secret patents on screening (inhibiting) technology of solid, homogeneous rocket propellants, were presented. Due to search on this subject, seven inventions applied by Institute of Organic Chemistry as secret ones to the Polish Patent Office in years 1968-1980, were found. Pieces of information on their disclosure, i.e. about removing secrecy, were published in the News of the Patent Office issued in years 2007-2008.
Źródło:
Problemy Techniki Uzbrojenia; 2022, 51, 160; 61--78
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building a non-homogeneous thermal environment for energy savings in the face of deep mines
Autorzy:
Li, Xian
Wu, Yaru
Zhang, Yunfei
Powiązania:
https://bibliotekanauki.pl/articles/2073873.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kopalnia
chłodzenie kopalni
klimatyzacja w kopalni
mine face
cooling strategy
non-homogeneous environment
air cooler
necessary cooling space
Opis:
Heat exhaustion of mining environments can cause a significant threat to human health. The existing cooling strategies for the mine face aim to cool the whole face. However, the necessary cooling space for the face is small, with a considerable amount of energy for cooling being wasted. Necessary cooling space is a space occupied by the workers in the face. This study proposed to build a non-homogeneous thermal environment for cost-effective energy savings in the face. An inlet air cooler was laid out in the intake airway to cool the whole face to some extent, and the tracking air cooler was designed to track the worker who constantly moved to improve the thermal environment. The cooling load and air distribution for this cooling strategy were investigated. In addition, the airflow in the face was solved numerically to estimate the cooling effect. The results revealed that an average energy saving of approximately 35% could be achieved. The thermal environment of the necessary cooling space within at least 10 m was significantly improved. This cooling strategy should be taken into account in mine cooling.
Źródło:
Archives of Mining Sciences; 2021, 66, 3; 457--474
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kompleksy platyny typu Markó zawierające n-heterocykliczne ligandy karbenowe O właściwościach supersterycznych
Markó-type platinum complexes containing bulky n-heterocyclic carbene ligands
Autorzy:
Bolt, Małgorzata
Żak, Patrycja
Powiązania:
https://bibliotekanauki.pl/articles/1413313.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
N-heterocykliczne ligandy karbenowe
kompleksy platyny
kataliza homogeniczna
hydrosililowanie
dimeryzacja
N-heterocyclic carbene ligands
platinum complexes
homogeneous catalysis
hydrosilylation
dimerization
Opis:
Progress in technology implying increasing demand for advanced materials dedicated for specific application has become a driving force stimulating research in different branches of science. It has been estimated that over 90% highly processed compounds have been obtained by the methods whose pivotal processes take place in the presence of catalysts based on transition metal complexes. Although these processes permit obtaining desired products, they are often charged with numerous drawbacks that prevent their implementation in industry. That is why the search for new catalytic systems ensuring high efficiency of final products and a possibility of reaction control is still an important direction of studies. Markó complexes are a group of platinum(0) coordination compounds of type [(NHC)Pt(dvtms)]. Although much attention has been recently attracted to these class of compounds, their number reported in hitherto literature is still limited. Owing to the possibility of wide modification of NHC carbene ligand attached to metal, the structures, and thus also properties, of the final complexes can be relatively easily matched to the requirements of individual catalytic reactions. It is particularly interesting in view of permanent development of new technologies and still increasing demand for new synthetic methods of more sophisticated materials dedicated to specific applications. In this paper, the synthesis and characterization of Markó type platinum(0) complexes containing bulky N-heterocyclic carbene ligands is described and their applications in the synthesis of new and unknown organic and organosilicon compounds are discussed. The main advantages of these complexes are highlighted providing an overview of this fascinating area of research.
Źródło:
Wiadomości Chemiczne; 2021, 75, 1-2; 31-53
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mittag-Leffler stability analysis of a class of homogeneous fractional systems
Autorzy:
Fajraoui, Tarek
Ghanmi, Boulbaba
Mabrouk, Fehmi
Omri, Faouzi
Powiązania:
https://bibliotekanauki.pl/articles/1409371.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
homogeneous fractional systems
Lyapunov homogeneous function
Mittag-Leffler stability
Opis:
In this paper,we start by the research of the existence of Lyapunov homogeneous function for a class of homogeneous fractional Systems, then we shall prove that local and global behaviors are the same. The uniform Mittag-Leffler stability of homogeneous fractional time-varying systems is studied. A numerical example is given to illustrate the efficiency of the obtained results.
Źródło:
Archives of Control Sciences; 2021, 31, 2; 401-415
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear homogeneous dynamical system of fully cracked concrete beam
Autorzy:
Mohan, G.
Pandey, U. K.
Powiązania:
https://bibliotekanauki.pl/articles/1818788.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
non-linear dynamics
two-DOF systems
homogeneous dynamical systems
bilinearity ratio
cracked concrete beams
fixed beam
dynamika nieliniowa
układ dynamiczny
system homogeniczny
belka betonowa
Opis:
Purpose: Purpose of this paper is the theoretical formulation of elasto-dynamics behaviour of fully cracked concrete beams for two-degree of freedom (DOF) dynamical system. Such modelled system is demonstrated by a new class of two-DOF conservative, fully-nonlinear systems known as nonlinear homogeneous dynamical (NHD) systems. Design/methodology/approach: The theoretical formulation of Two-DOF dynamical system has been developed by using the fundamental concept of structural analysis. Further, the behaviour of such class of conservative dynamical system has been concluded by using MATLAB. Findings: Findings can be distinguished into two aspects. First, when subjected to service loads, reinforced concrete structures possess tension cracks. Due to load variation with time leads the breathing action (opening-closing-reopening) of existing cracks and the behaviour of such structures are nonlinearly-elastic. Second, such class of fully nonlinear dynamical system possess dependence of stiffness coefficients on nodal displacements. Research limitations/implications: The mechanism behind such class of fully nonlinear dynamical system is not yet fully explored. Practical implications: Practical implications are related to the structural response of fully cracked concrete beam to different earthquake excitation, especially to understand the response of such nonlinear homogeneous elasto-dynamical system with two-DOF concrete beam. Originality/value: Elasto-dynamics of fully cracked concrete beams.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2021, 106, 1; 5--19
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust continuous third-order finite time sliding mode controllers for exoskeleton robot
Autorzy:
Fellag, Ratiba
Guiatni, Mohamed
Hamerlain, Mustapha
Achour, Noura
Powiązania:
https://bibliotekanauki.pl/articles/1845025.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exoskeleton robot
higher order
sliding control
homogeneous
robust
trajectory tracking
rehabilitation
Opis:
In this work, continuous third-order sliding mode controllers are presented to control a five degrees-of-freedom (5-DOF) exoskeleton robot. This latter is used in physiotherapy rehabilitation of upper extremities. The aspiration is to assist the movements of patients with severe motor limitations. The control objective is then to design adept controllers to follow desired trajectories smoothly and precisely. Accordingly, it is proposed, in this work, a class of homogeneous algorithms of sliding modes having finite-time convergence properties of the states. They provide continuous control signals and are robust regardless of non-modeled dynamics, uncertainties and external disturbances. A comparative study with a robust finite-time sliding mode controller proposed in literature is performed. Simulations are accomplished to investigate the efficacy of these algorithms and the obtained results are analyzed.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 4; 395-414
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SI engine fuel mixture type indicator and an assessment of its suitability of an economic driving style
Autorzy:
Wołczyński, Zbigniew
Żak, Mikołaj
Powiązania:
https://bibliotekanauki.pl/articles/2097610.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
SI engine with direct fuel injection
stratified mixture
homogeneous mixture
mixture type indicator
economical driving style
fuel consumption
silniki ZI z bezpośrednim wtryskiem paliwa
mieszanka uwarstwiona
mieszanka jednorodna
wskaźnik typu mieszanki
ekonomiczny styl jazdy
zużycie paliwa
Opis:
The article presents the structure and a principle of operation of a simple indicator of the type of a fuel-air mixture supplying a spark-ignition engine with a direct fuel injection. The designed indicator was tested, as a result of which its correct operation was verified. By using information from the indicator, it was possible to assess its usefulness for assisting the driver in an economical driving style. Preliminary studies show that thanks to the use of the developed indicator, it is possible to save about 10% of fuel as a result of the correction of the economic driving style on the route selected for the purpose of this research paper. The target of this study was to confirm a noticeable reduction in fuel consumption when supplying the engine with a stratified mixture. In order to obtain more accurate data, the research should be extended to include a greater number of routes and its division into urban and non-urban areas.
Źródło:
Combustion Engines; 2021, 60, 4; 69--76
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 139

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