Temat: continuum theory - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Jakie szanse w wyborach prezydenckich mają kobiety? Badania eksperymentalne wśród młodzieży
What are the Chances of Female Candidates in Presidential Elections? (Experimental Study among the Polish Youth)
Autorzy:: Jakubowska, Urszula
Powiązania:: https://bibliotekanauki.pl/articles/2135530.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stereotypy płciowe
kategoryzacja społeczna
głosowanie tematyczne
teoria continuum
presidential election
gender stereotypes
social categorization
continuum theory
issue voting
Opis:: Celem badania było sprawdzenie, czy i jakie zmiany zaobserwować można w stosunku młodzieży wobec polityków odmiennej płci. W badaniu wzięło udział 929 osób (454 kobiety i 475 mężczyzn), w wieku od 18 do 25 lat, z wykształceniem średnim (uczniowie szkół maturalnych i studenci). Przeprowadzono serię eksperymentów, w których opisywano fikcyjnych kandydatów – kobietę i mężczyznę – na urząd prezydenta. Manipulowano zakresem informacji o politykach (płeć, afiliacja polityczna, pozytywne i negatywne charakterystyki moralności i kompetencji oraz programu politycznego). Zaobserwowano: (1) efekt faworyzacji polityka własnej płci w grupie badanych kobiet, (2) zniekształcenia w percepcji kobiety–polityka; kandydatka na prezydenta wzbudzała bardziej pozytywne albo negatywne ustosunkowania niż kandydat na prezydenta w warunkach prezentacji pozytywnych albo negatywnych charakterystyk.
The aim of the study was to examine how the manipulation of information about hypothetical presidential candidates infl uenced youth’ attitudes towards them. The experiment was conducted on 929 subjects (454 women and 475 men), who were either pupils in their fi nal year of secondary school or university students, aged 18–25. The amount of information about politicians was manipulated (politicians’ gender, political affi liation, moral and competence traits (positive or negative), political programme characteristics). The results showed that (1) the own-group favoritism effect was observed only among female participants, (2) female presidential candidate was evaluated better than male presidential candidate in conditions of positive information, yet, when negative information about candidates was provided, female presidential candidate was evaluated worse than male presidential candidate.
Źródło:: Studia Socjologiczne; 2010, 2(197); 31-51
0039-3371
Pojawia się w:: Studia Socjologiczne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening
Autorzy:: Ecsi, L.
Elesztos, P.
Powiązania:: https://bibliotekanauki.pl/articles/264832.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: teoria plastyczności
utwardzanie izotropowe
odkształcenia plastyczne
nonlinear continuum theory of finite deformations of elasto-plastic media
generalized J2 flow plasticity theory with isotropic hardening
objective and thermodynamically consistent formulationg
Opis:: In this paper an alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening is presented. The model is based on a new nonlinear continuum mechanical theory of finite deformations of elasto-plastic media which allows for the development of objective and thermodynamically consistent material models. As a result, the constitutive equation, the evolution equation and even the ‘normality rule’, characterising the plastic flow in the material during return mapping, can be expressed in various forms, using several instances of the yield surface and corresponding pairs of stress measures and strain rates, respectively, which are conjugate with respect to the internal mechanical power and its arbitrary higher order time derivative. Therefore the results of the material model when used in numerical analyses are not affected by the description and particularities of the material model formulation. Here, we briefly outline the nonlinear continuum theory along with a detailed description of the material model and finally present the model in a numerical example using a cross-shaped specimen in biaxial tension.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 339-353
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Research on E.C. Bingham constitutive model of rock under impact load for deep well
Wykorzystanie modelu E.C. Binghama przy badaniu skał narażonych na obciążenia udarowe w górnictwie podziemnym
Autorzy:: Zhao, G. M.
Xie, L. X.
Meng, X. R.
Powiązania:: https://bibliotekanauki.pl/articles/348692.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: SHPB
teoria odkształceń ciągłych
statystyczna teoria odkształceń
równanie powstawania odkształceń
model E.C. Bingham'a
continuum damage theory
statistical damage theory
constitutive equation of damage excess stress model
E.C. Bingham constitutive model
Opis:: The soft rock materials have special dynamic properties in deep mining. Their dynamic compression tests are performed with experimental system of Split Hopkinson Pressure Bar (SHPB). The results of experiment indicate that the dynamic stress-strain curves of rock materials are of distinct plastic yield characteristics. Based on modified excess stress model, according to the function relationship between strain, strain rate and, to simplify constitutive equation of modified excess stress model with dimensionless analysis, the simplified constitutive equation of modified excess stress model is obtained; And then, continuum damage theory and statistical damage theory are incorporated into the simplified constitutive equation of modified excess stress model account for the influence of damage to dynamic strength, the simplified constitutive equation of damage excess stress model is built up. The simplified constitutive functions are fitted out respectively on the basis of the experimental data. There is a good coherence between the fitting stress-strain curves and the experimental stress-strain curves.
Miękkie materiały skalne w kopalniach głębokich posiadają specyficzne właściwości dynamiczne. Wykonano testy kompresji dynamicznej przy zastosowaniu urządzenie kompresyjnego Hopkinsona (Split Hopkinson Pressure Bar SHPB). Wyniki przeprowadzonych badań wykazały, krzywe wykresu rozciągania skał mają charakterystykę typową dla materiałów upłynnionych. W oparciu o model rozkładu naprężeń, zgodnie z funkcją zależności pomiędzy typem odkształcenia a jego szybkością, celem uproszczenia równania odkształcenia zmodyfikowanego przy pomocy analizy bezwymiarowej, otrzymano równanie opisujące model naprężeń zmodyfikowanych. Następnie wykorzystano teorię ciągłego kontinuum oraz teorię statystyki odkształceń w równaniu odkształcenia zmodyfikowanego celem ustalenia zależności z badanym modelem. Uproszczone w ten sposób funkcje skorelowano na podstawie otrzymanych danych doświadczalnych. Ustalono wysoką spójność pomiędzy krzywymi teoretycznymi i doświadczalnymi.
Źródło:: AGH Journal of Mining and Geoengineering; 2012, 36, 3; 489-500
1732-6702
Pojawia się w:: AGH Journal of Mining and Geoengineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic vibration absorbers – optimization and design
Autorzy:: Pelekh, Ya.
Diveyev, B.
Hlobchak, M.
Powiązania:: https://bibliotekanauki.pl/articles/410921.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:: rotating machines
discreet-continuum theory
modal analysis
dynamic vibration absorber
optimal design
electrical plants
gas- and oil pipelines
aerospace technique
chisel installation
cars
magneto-optical disks
home appliances
maszyny wirujące
teoria układów dyskretno-ciągłych
analiza modalna
absorber wibracyjno-dynamiczny
optymalne kształtowanie
elektrociepłownie
rurociągi naftowo-gazowe
technika lotnicza
samochody
dyski magnetyczno-optyczne
sprzęt AGD
Opis:: The main aim of the paper is improved dynamic vibration absorbers (DVA) design, taking into account the complex rotating machines dynamics. It is often impossible to balance the rotating elements so as to reduce the vibration to an acceptable level. The paper considers the provision of DVA or number of such DVA. Such originally designed DVA reduces vibration selectively in the maximum mode of vibration without introducing vibration in other modes. The result is achieved at a far lower expense than would be required to replace the concrete and steel foundation with a more massive one. By installing DVA, one can minimize excitation virtually at the source. In order to be more effective, a vibration absorption system should react in all the frequency domains. The present absorber also has as an advantage that it can be constructed so that it has a wide-range vibration absorption property. This construction allows for an easy connection of the above rotor equipment. In order to determine the optimal parameters of DVA, the complete modeling of the rotating machine dynamics is obvious. The two degrees of freedom model are totally inadequate to accurately calculate the vibration frequencies of the construction and therefore, for a sufficiently accurate determination of its dimensional characteristics so as to determine such frequencies. It is therefore necessary in practice to dimension the construction through more complex modeling. In particular, concentrated mass and rigidity calculation methods may be adopted based on an even more accurate theoretical determination. The numerical schemes (NS) row is considered for the complex vibration-excited constructions. Methods of decomposition and the NS synthesis are considered on the basis of new methods of modal synthesis. Complex NS are obtained of discretely-continua type, which enables in the adaptive mode to calculate tension not only in the continuum elements, but in the places of the most tension concentration in joints. Traditional design methodology, based on discontinuous models of structures and machines is not effective for high frequency vibration. The present research develops a modern prediction and control methodology, based on complex continuum theory and application of special frequency characteristics of structures. Complex continuum theory allows to take into consideration system anisotropy, supporting structure strain effect on equipment motions and to determine some new effects that are not described by ordinary mechanics of the continuum theory. The absorbers in accordance with this paper may be applied not only to electric machines ore aeronautic structures, but also to any other type of vibration-excited structure, such as cars, chisel installation, optical, magneto-optical disks, washing machines, refrigerators, vacuum cleaners, etc.
Źródło:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 1; 23-30
2084-5715
Pojawia się w:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: On what I do not understand (and have something to say): Part I
Autorzy:: Shelah, Saharon
Powiązania:: https://bibliotekanauki.pl/articles/1204995.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: set theory
cardinal arithmetic
pcf theory
forcing
iterated forcing
large continuum
nep
nicely definable forcing
combinatorial set theory
Boolean algebras
set-theoretic algebra
partition calculus
Ramsey theory
Opis:: This is a non-standard paper, containing some problems in set theory I have in various degrees been interested in. Sometimes with a discussion on what I have to say; sometimes, of what makes them interesting to me, sometimes the problems are presented with a discussion of how I have tried to solve them, and sometimes with failed tries, anecdotes and opinions. So the discussion is quite personal, in other words, egocentric and somewhat accidental. As we discuss many problems, history and side references are erratic, usually kept to a minimum ("see ..." means: see the references there and possibly the paper itself). The base were lectures in Rutgers, Fall '97, and reflect my knowledge then. The other half, [122], concentrating on model theory, will subsequently appear. I thank Andreas Blass and Andrzej Rosłanowski for many helpful comments.
Źródło:: Fundamenta Mathematicae; 2000, 166, 1-2; 1-82
0016-2736
Pojawia się w:: Fundamenta Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Stock market as a game with continuum of players
Giełda jako gra z continuum graczy
Autorzy:: Michałowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/305927.pdf
Data publikacji:: 2014
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: stock market
behavior models
individual investors
game theory
games with continuum of players
giełda
modele zachowań
inwestorzy masowi
teoria gier
gra z kontinuum graczy
Opis:: The paper presents specifics and assumptions included in games theory. Author made first attempt to create stock exchange model based on games theory, specific games with continuum of players. The article is the result of efforts to create an adequate mathematic model in order to investigate the specificity of the decision-making behavior of so-called individual stock market investors.
W artykule przedstawiono możliwość wykorzystania teorii gier z continuum graczy w modelowaniu zachowań graczy na giełdzie. Dokonano pierwszej próby opracowania modelu giełdy w oparciu o teorie gier z continuum graczy. Artykuł jest wynikiem prac nad opracowaniem matematycznego modelu pozwalającego badać specyfikę zachowań decyzyjnych tzw. giełdowych inwestorów masowych.
Źródło:: Biuletyn Instytutu Systemów Informatycznych; 2014, 14; 19-24
1508-4183
Pojawia się w:: Biuletyn Instytutu Systemów Informatycznych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Knowledge, Theory and Practice in Knowledge Management: Betweeen Associative Pattering and Context-Rich Action
Autorzy:: Bennet, Alex
Bennet, David
Powiązania:: https://bibliotekanauki.pl/articles/474962.pdf
Data publikacji:: 2014
Wydawca:: Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:: knowledge
knowledge management
theory
information
learning
surface knowledge
shallow knowledge
deep knowledge
neuroscience
mind/brain
decision-making
higher-order patterns
complexity
thought leaders
practitioners
knowledge (proceeding)
knowledge (informing)
SECI model
DIKW continuum
wisdom
KM research
KM frameworks
Opis:: Embedded throughout this paper you will find the diversity of opinions that correlates to the diversity of theories, frameworks, case studies and stories that are related to the field of Knowledge Management (KM). We begin by introducing the Sampler Research Call approach and the 13 KM academics and practitioners working in different parts of the world who answered the call. We then provide baseline definitions and briefly explore the process of knowledge creation within the human mind/brain. After a brief (and vastly incomplete) introduction to KM literature at the turn of the Century, the frameworks of Sampler Call participants are introduced, and two early frameworks that achieved almost cult status—the Data-Information-Knowledge-Wisdom (DIKW) continuum and the SECI (socialization, externalization, combination and internalization) model—are explored through the eyes of Sampler Call participants. We then introduce the results of the KMTL (Knowledge Management Thought Leader) Study, which suggest theories consistent with the richness and diversity of thought interwoven throughout this paper. The field of KM is introduced as a complex adaptive system with many possibilities and opportunities. Finally, we share summary thoughts, urging us as KM academics and practitioners to find the balance between the conscious awareness/understanding of higher-order patterns and the actions we take; between the need for overarching theory and the experiential freedom necessary to address context-rich situations.
Źródło:: Journal of Entrepreneurship, Management and Innovation; 2014, 10, 1; 7-55
2299-7075
2299-7326
Pojawia się w:: Journal of Entrepreneurship, Management and Innovation
Dostawca treści:: Biblioteka Nauki

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