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Tytuł:
Expansion of human sexuality in cyberspace
Autorzy:
Nymś-Górna, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/951809.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
sex
sexuality
Internet
date
couple
Opis:
One of the key aspects of human life is sexuality. Like other areas of human life, it is constantly changing. However, the technological revolution of recent years has been particularly influential. The aim of this article is to present the progressive revolution of human sexuality in the context of the development of new technologies.
Źródło:
Kultura-Społeczeństwo-Edukacja; 2019, 16, 2
2300-0422
Pojawia się w:
Kultura-Społeczeństwo-Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extases inexplicables
Unexplainable Ecstasies
Autorzy:
Bousquet, Louis
Powiązania:
https://bibliotekanauki.pl/articles/2020935.pdf
Data publikacji:
2020
Wydawca:
Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
Tematy:
virility
drug
gift
love
couple
Opis:
In Serotonin, the houellebecquian homunculus, Florent-Claude Labrouste, is a “dead man walking.” Disenchanted and full of regrets about his past, he decides to break with society and disappear from the world. Bound one more time to a painful and lonely life, the hero uses antidepressants to numb his pain. His newfound emotion-deprived awareness allows him to reflect on his journey, on the missed opportunities that life had bestowed upon him and on the far-fetched possibilities left behind. This article will examine Serotonin’s take on love and its epitome, the romantic couple. Love according to Houellebecq is an existential deed, one that propels the homunculus into existence in a world bent on its destruction, as the romantic couple creates a space, an otherworldly and literary dimension in which every human can potentially find redemption – every human it seems but Houellebecq’s hero; his shrinking masculinity threatens his chances to partake in any meaningful relationship. Florent-Claude passively witnesses his two first loves leaving his life, and he seems incapable of any meaningful action to stop this decaying process. This work will try to answer the riddle that is the homunculus, torn between a redeeming far-fetched ecstasy and the quick fixes of modern society
Źródło:
Academic Journal of Modern Philology; 2020, 9; 235-244
2299-7164
2353-3218
Pojawia się w:
Academic Journal of Modern Philology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kiedy zaczyna się para? Zamieszkanie, ślub i inne wspólne decyzje – debata podsumowująca projekt badaczy i badaczek par
When Does a Couple Start? Living Together, Marriage and Other Joint Decisions – A Roundtable Summarizing the Project on Couples
Autorzy:
Żadkowska, Magdalena
Jasińska, Joanna
Mizielińska, Joanna
Stasińska, Agata
Schmidt, Filip
Powiązania:
https://bibliotekanauki.pl/articles/427503.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Polska
para
zamieszkanie razem
małżeństwo
socjologia pary
Polska
couple
living together
marriage
sociology of couple
Opis:
Debata toczy się wokół dwóch kluczowych momentów życia pary, jakimi są zamieszkanie i ślub oraz związane z nimi praktyki. Według uczestniczek i uczestników debaty, mimo że związek może trwać i bez tych wydarzeń, to z badań nad parami wynika, że stanowią one ważne punkty zwrotne. W prezentowanej rozmowie zebrano wnioski o kondycji par w Polsce, z uwzględnieniem różnic i podobieństw pomiędzy parami jedno i dwupłciowymi, a także różnic związanych z wiekiem, wykształceniem i pochodzeniem (zarówno narodowym, jak i klasowym).
The roundtable discussion revolves around the two key moments in a couple’s life: living together and marriage (and related practices). The participants of the discussion have agreed that although the relationship can last without these two moments, they are important turning points for the study of pairs. In the debate, the findings concerning the condition of couples in Poland have been presented, and particular attention has been paid to the differences and similarities between one and two-sex couples as well as between the couples of different age, education and origin, understood as both national and class background.
Źródło:
Studia Socjologiczne; 2018, 3(230); 101-123
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global stability for double-diffusive convection in a couple-stress fluid saturating a porous medium
Autorzy:
Choudhary, Shalu
-, Sunil
Powiązania:
https://bibliotekanauki.pl/articles/949858.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
couple-stress parameter
solute gradient
Brinkman number
Opis:
We show that the global non-linear stability threshold for convection in a double-diffusive couplestress fluid saturating a porous medium is exactly the same as the linear instability boundary. The optimal result is important because it shows that linearized instability theory has captured completely the physics of the onset of convection. It is also found that couple-stress fluid saturating a porous medium is thermally more stable than the ordinary viscous fluid, and the effects of couple-stress parameter (F ) , solute gradient (S f ) and Brinkman number (Da ) on the onset of convection is also analyzed.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 1; 13-20
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Komunikacja, relacje partnerskie oraz funkcjonowanie seksualne par leczących się z powodu niepłodności
Communication, partnership and sexual functioning of couples treated for infertility
Autorzy:
Czyżkowska, Anna
Rawińska, Marta
Jóźwik, Milena
Powiązania:
https://bibliotekanauki.pl/articles/564896.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
infertility
communication
sexual functioning
couple’s relationship
Opis:
The goal of this study was to investigate how infertility changes couples’ relations, communication and sexual functioning. In the research participated 50 women during the treatment of infertility and 50 healthy women in the control group. The study confirmed our hypothesis. Couples during the treatment of infertility have more problems in their relationship (in comparison to couples without infertility problem) in following aspects: communication, task accomplishment and role performance, affective expression, affective involvement, values and norms. Communication in both groups (study group as well as control group) correlates with sexual satisfaction, the correlation between couples’ relations and sexual satisfaction are higher in healthy women group than in infertile women group.
Źródło:
Studia Psychologica; 2013, 13, 2; 7-14
1642-2473
Pojawia się w:
Studia Psychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eigenvalue approach to nanobeam in modified couple stress thermoelastic with three-phase-lag model induced by ramp type heating
Autorzy:
Kumar, R.
Devi, S.
Powiązania:
https://bibliotekanauki.pl/articles/279203.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
modified couple stress thermoelastic
eigenvalue approach
nanobeam
Opis:
This article deals with the study of a thermoelastic nanobeam in a modified couple stress theory subjected to ramp-type heating. The mathematical model is prepared for the nanobeam in thermoelastic three-phase-lag. The Laplace transform and the eigenvalue approach are used to find the displacement component, lateral deflection, temperature change and axial stress of the thermoelastic beam. The general algorithm of the inverse Laplace transform is developed to compute results numerically. The comparison of three-phase-lag, dual-phaselag and GN-III (1993) models are represented, and their illustration is depicted graphically. This study finds the applications in engineering, medical science, sensors, etc.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 1067-1079
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural considerations on SH-wave propagation in a piezoelectric layered structure
Autorzy:
Goyal, R.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/280348.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
SH-wave
piezoelectricity
couple stress
characteristic length
Opis:
Shear wave based acoustic devices are being used in gaseous and liquid environments because of their high-sensitivity. The theoretical study of horizontally polarized shear (SH) waves in a layered structure consisting of a piezoelectric ceramic of P ZT − 5H or BaT iO3 material overlying a couple stress substrate is presented in this paper. The considered substrate is supposed to be exhibiting microstructural properties. The closed form expression of dispersion relations are derived analytically for electrically open and short conditions. The effects of internal microstructures of the couple stress substrate, thickness of P ZT − 5H or BaT iO3 ceramic, piezoelectric and dielectric constants are illustrated graphically on the phase velocity of the piezoelectric layer under electrically open and short conditions.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 993-1004
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LIFE CYCLE INCOME OF WOMEN AND MEN IN POLAND
Autorzy:
Liberda, Barbara
Pęczkowski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/453077.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
gender
income
life cycle
married
cohabited
couple
Polska
Opis:
We examine the contribution of married and cohabited women and men to the joint income of the couple. We use individual income data from Household Budget Surveys for Poland in 2011 from a sample of 16,538 married and cohabited couples. The results of analysis show that contribution of men to total household income is higher than contribution of their female partners through the life cycle, controlling for type of a couple, education levels of genders and number of children. The contribution of married and cohabited women to total income of the couple remains almost flat during the life cycle.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 1; 76-91
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish Adaptation of Marital Satisfaction Questionnaire For Older Persons (MSQFOP)
Polska adaptacja Kwestionariusza Satysfakcji z Małżeństwa dla Osób Starszych MSQFOP
Autorzy:
Brudek, Paweł Jan
Powiązania:
https://bibliotekanauki.pl/articles/1368490.pdf
Data publikacji:
2021-01-13
Wydawca:
Uniwersytet Opolski. Redakcja Wydawnictw Wydziału Teologicznego
Tematy:
marital satisfaction
Polish adaptation
late adulthood
older couple
Opis:
The article outlines the results of academic endeavors to develop a Polish adaptation of Stephen Haynes’ and colleagues Marital Satisfaction Questionnaire For Older Persons (MSQFOP). The results obtained using the Polish version are comparable to those obtained using the original research instrument, which proves that the Polish MSQFOP scale adaptation can be successfully used for research purposes. The scale consists of 24 items covering four dimensions: Communication and expression of feelings, Sex life, Health and Affiliation. The scale testing procedure involved a research sample consisting of 832 people. The Cronbach's alpha coefficient was .94 for the entire scale and oscillated between .68 and .94 for the subscales.
W artykule zaprezentowano wyniki prac nad polską adaptacją Kwestionariusza Satysfakcji z Małżeństwa dla Osób Starszych (The Marital Satisfaction Questionnaire For Older Persons) MSQFOP autorstwa S. N. Haynesa i współpracowników. Przedstawiono właściwości psychometryczne polskiej wersji MSQFOP. Otrzymane rezultaty są porównywalne z danymi dla wersji oryginalnej narzędzia i potwierdzają, że polska wersja kwestionariusza MSQFOP może mieć zastosowanie w badaniach naukowych. Kwestionariusz składa się z 24 itemów tworzących cztery wymiary: Komunikacja/Wyrażanie uczuć, Pożycie seksualne, Zdrowie, Afiliacja. Skala przetestowana została w badaniach 832 osób. Wskaźnik rzetelności (α-Cronbacha) dla całej skali wynosi 0,94 a w odniesieniu do poszczególnych podskal waha się od 0,68 do 0,94.
Źródło:
Family Forum; 2020, 10; 277-297
2084-1698
Pojawia się w:
Family Forum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Childhood Sexual Abuse for Intimate Couple Relationship according to Relational Marital Therapy
Autorzy:
Jerebic, Sara
Jerebic, Drago
Powiązania:
https://bibliotekanauki.pl/articles/668770.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Papieski Jana Pawła II w Krakowie
Tematy:
Childhood sexual abuse
couples
sexuality
intimacy
relational couple therapy
Opis:
Childhood sexual abuse is a traumatic experience, the consequences of which are numerous in adult intimate relationships. Couples often have problems in maintaining their relationships and frequently face problems in their sexual life. Because of the consequences that they experience and which they usually do not attribute to past trauma, couples increasingly seek therapeutic help. A safe therapeutic relationship enables the formation of new neural connections and a change in relational structures. Identifying and understanding the consequences of sexual abuse with elements of dual awareness is essential for the partnership and healing of both partners. The purpose of the article is to deepen the understanding of the consequences of childhood sexual abuse for couple relationships according to the Relational Marital Therapy paradigm.
Źródło:
The Person and the Challenges. The Journal of Theology, Education, Canon Law and Social Studies Inspired by Pope John Paul II; 2018, 8, 2
2391-6559
2083-8018
Pojawia się w:
The Person and the Challenges. The Journal of Theology, Education, Canon Law and Social Studies Inspired by Pope John Paul II
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of Love-type waves in an elastic layer sandwiched between viscous liquid half space and size dependent couple stress substrate
Autorzy:
Sharma, Vanita
Kumar, Satish
Powiązania:
https://bibliotekanauki.pl/articles/280534.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Love-type waves
couple stress
viscous liquid
viscosity
sensors
Opis:
Dispersion curves employed for designing Love wave based liquid sensing devices may provide more accurate information if due consideration is given to parameters describing microstructural behavior of the substrate. The present study involves mathematical modelling of Love waves propagating in a hybrid structure consisting of an elastic layer in the middle overlying a size dependent substrate, loaded with a viscous liquid (Newtonian) half space. Numerical computations are carried out to graphically demonstrate the effects of various parameters: characteristic length of the substrate, thickness of the elastic layer, viscosity and density of the overlying viscous liquid (Newtonian) on dispersion characteristics.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1009-1019
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of notch wear mechanisms in the machining of nickel-based Inconel 718 alloy
Autorzy:
Grzesik, Wit
Powiązania:
https://bibliotekanauki.pl/articles/1428916.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
tool wear
aerospace alloy
oxidation mechanism
diffusion couple method
Opis:
This paper highlights tool wear mechanisms in the machining of heat resistance alloys including nickel-based Inconel 718 alloy which is one of the most popular material in the aircraft industry. Special attention was paid to the notch wear which develops on the flank face due to high temperature oxidation of the cutting tool material at temperature of about 800°C. The experimental procedure includes the diffusion couple methods and tool wear tests which assess the degradation of the deposited coating. The obtained results were supported by SEM images of the flank face periphery and EDS analysis performed in the regions of intensive oxidation. Some conclusions and ongoing research on the investigation of the oxidation phenomenon of cutting tool materials are outlined.
Źródło:
Journal of Machine Engineering; 2021, 21, 1; 56-66
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The onset of thermal convection in couple-stress fluid in hydromagnetics saturating a porous medium
Autorzy:
Rana, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/201216.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
couple stress fluid
magnetic field
porous medium
thermal convection
Opis:
In this paper, the effect of magnetic field on thermal convection in couple-stress fluid saturating a porous medium is considered. By applying linear stability theory and the normal mode analysis method, a mathematical theorem is derived which states that the viscoelastic thermal convection at marginal state, cannot manifest as stationary convection if the thermal Rayleigh number R, the medium permeability parameter Pι the couple-stress parameter F and the Chandrasekher number Q, satisfy the inequality R ≤4π2/Pl (1 + 2π2F + PlQ/2ε) the result clearly establishes the stabilizing character of couple-stress parameter and magnetic field whereas destabilizing character of medium permeability.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 357-362
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion of Rayleigh Waves in a Microstructural Couple Stress Substrate Loaded with Liquid Layer Under the Effects of Gravity
Autorzy:
Sharma, V.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/947783.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
couple stress theory
Rayleigh waves
gravity
characteristic length
liquid loading
Opis:
Bone loss is one of the serious health issues in bedridden patients or young generation due to lack of physical activities. Mechanical forces are exerted on the bones through ground reaction forces, liquid loadings and by other contraction activities of the muscles. We are assuming an isotropic half-space with mechanical properties equivalent to that of bone exhibiting microstructures. Consistent couple stress theory introduces an additional material parameter called characteristic length which accounts for inner microstructure of the material. Dispersion relations for leaky Rayleigh waves are derived by considering a model consisting of couple stress half space under the effects of gravity and loaded with inviscid liquid layer of finite thickness or a liquid half space. Impact of the gravity, liquid loadings and microstructures of the material are investigated on propagation of leaky Rayleigh type waves. Phase velocity of leaky Rayleigh waves is studied for five different values of characteristic length parameter which are of the order of internal cell size of the considered material. Variations in phase velocity of leaky Rayleigh waves are also studied under the effect of gravity parameter and thickness of liquid loadings.
Źródło:
Archives of Acoustics; 2018, 43, 1; 11-20
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion of SH waves in a viscoelastic layer imperfectly bonded with a couple stress substrate
Autorzy:
Sharma, V.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/949130.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
SH waves
couple stress theory
imperfect bonding
characteristic length
viscoelasticity
Opis:
The paper deals with propagation of SH waves in a viscoelastic layer over a couple stress substrate with imperfect bonding at the interface. A dispersion equation of SH waves in a viscoelastic layer overlying the couple stress substrate with an imperfect interface between them has been obtained. Dispersion equations for propagation of SH waves with perfectly bonded interface and slippage interface between two media are also obtained as particular cases. Effects of the degree of imperfectness of the interface are studied on the phase velocity of SH waves. The dispersion curves are plotted and the effects of material properties of both couple stress substrate and viscoelastic layer are studied. The effects of internal microstructures of the couple stress substrate in terms of characteristic length of the material are presented. The effects of heterogeneity, friction parameter and thickness of the viscoelastic layer are also studied on the propagation of SH waves.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 535-546
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of liquid loadings on lamb waves in context of size dependent couple stress theory
Autorzy:
Sharma, V.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/949331.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
couple stress
characteristic length
Lamb waves
elastic waves
liquid loadings
Opis:
For understanding the effects of an internal microstructure, generalised microcontinuum theories with additional microstructural parameters are developed. One such a parameter, called the characteristic length of the material comparable with the internal cell size of the material is involved in the couple stress theory. The problem of propagation of Lamb waves in a plate with an internal microstructure and loaded with an inviscid liquid on both sides is studied using the couple stress theory. The dispersion equation of Lamb waves with the liquid loadings is derived. The impact of the liquid loadings is studied on the propagation of Lamb waves. The effect of the characteristic length is also studied on the phase velocity of Lamb waves in the plate for various modes in the presence of liquid loadings.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 925-934
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Franco-German Leadership in the EU: Lessons from the Euro Crisis
Autorzy:
Hilz, Wolfram
Powiązania:
https://bibliotekanauki.pl/articles/2091696.pdf
Data publikacji:
2020-06-24
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Politycznych i Studiów Międzynarodowych
Tematy:
Euro crisis
leadership in Europe
Germany
France
Franco-German
couple
Opis:
Since the outbreak of the Euro crisis in 2010 the European Union seems to tumble from one crisis to the next: From Arab spring to the Ukraine conflict, from Syrian civil war to the refugee crisis. So far the EU members did not find a way out of these crises. Although in times when all EU partners seem to be paralyzed by an aversion of strengthening the EU institutions they might be forced working closer together anyway. Against the background of a general loss of orientation inside the EU this article takes a closer look at the handling of the Euro crisis. It discusses whether revived Franco-German leadership inside Europe might be an option to give orientation to all EU members. Starting with a brief review of the strengths of this bilateral couple during the initial phase of European integration it is the aim to detect its unique capability to lead the EU out of European crises. Since Germans and French after serious disputes and despite different economic interests managed to work together for European solutions, both might be a role model for all EU members. The way the governments in Berlin and Paris overcame their differences during the Euro crisis delivers insights for all EU partners to cope with the structural economic imbalances.
Źródło:
Stosunki Międzynarodowe - International Relations; 2015, 51, 4; 255-268
0209-0961
Pojawia się w:
Stosunki Międzynarodowe - International Relations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-spring model for buckling analysis of cracked Timoshenko nanobeams based on modified couple stress theory
Autorzy:
Akbarzadeh Khorshidi, M.
Shariati, M.
Powiązania:
https://bibliotekanauki.pl/articles/281289.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
buckling
crack
modified couple stress theory
Timoshenko nanobeam
spring model
Opis:
This paper develops a cracked nanobeam model and presents buckling analysis of this developed model based on a modified couple stress theory. The Timoshenko beam theory and simply supported boundary conditions are considered. This nonclassical model contains a material length scale parameter and can interpret the size effect. The cracked nanobeam is modeled as two segments connected by two equivalent springs (longitudinal and rotational). This model promotes discontinuity in rotation of the beam and additionally considers discontinuity in longitudinal displacement due to presence of the crack. Therefore, this multi-spring model can consider coupled effects between the axial force and bending moment at the cracked section. The generalized differential quadrature (GDQ) method is employed to discretize the governing differential equations, boundary and continuity conditions. The influences of crack location, crack severity, material length scale parameter and flexibility constants of the presented spring model on the critical buckling load are studied.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1127-1139
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-rotatory compressible couple-stress fluid heated from below in porous medium
Autorzy:
Mehta, C. B.
Powiązania:
https://bibliotekanauki.pl/articles/178540.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
compressible couple-stress fluid
thermal convection
porous medium
rotation
magnetic field
Opis:
The study is aimed at analysing thermal convection in a compressible couple stress fluid in a porous medium in the presence of rotation and magnetic field. After linearizing the relevant equations, the perturbation equations are analysed in terms of normal modes. A dispersion relation governing the effects of rotation, magnetic field, couple stress parameter and medium permeability have been examined. For a stationary convection, the rotation postpones the onset of convection in a couple stress fluid heated from below in a porous medium in the presence of a magnetic field. Whereas, the magnetic field and couple stress postpones and hastens the onset of convection in the presence of rotation and the medium permeability hastens and postpones the onset of convection with conditions on Taylor number. Further the oscillatory modes are introduced due to the presence of rotation and the magnetic field which were non-existent in their absence, and hence the principle of exchange stands valid. The sufficient conditions for nonexistence of over stability are also obtained.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 1; 55-63
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shear band development in modified DEM: importance of couple stress
Autorzy:
Iwashita, K.
Oda, M.
Powiązania:
https://bibliotekanauki.pl/articles/1953963.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
shear band development
distinct element method
couple stress
numerical simulation tests
Opis:
Numerical simulation tests were carried out using the distinct element method (DEM) with great interest in how large couple stress is actually generated in a shear band. To do this, the conventional DEM was modified slightly, so that the effect of rolling resistance at contact points can be taken into account (called MDEM). It has been found that MDEM provides a powerful tool in simulating not only the generation of large voids inside a shear band but also the high gradient of particle rotation along the shear band boundaries, in a quite similar manner to those of natural granular soils; and that couple stress, although it is very small, is certainly developed in a consistent manner with the particle relation gradient developed in a shear band.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 3; 443-460
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie metody PPM do oceny pary ciernej w układzie hamulcowym samochodu
Application of PPM method for assessment of frictional coupe in car brake system
Autorzy:
Jósko, M.
Powiązania:
https://bibliotekanauki.pl/articles/107832.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metoda PPM
para cierna
układ hamulcowy
PPM method
frictional couple
braking system
Opis:
W artykule przedstawiono ocenę możliwości zastosowania nieniszczącej metody Prescale Pressure Measurment (PPM) do oceny funkcjonowania i stanu pary ciernej klocek–tarcza w układzie hamulcowym pojazdu samochodowego. Przeprowadzono ogólną analizę potencjalnych możliwości metody w zastosowaniu do węzłów samochodu. Wykonano skalowanie folii na prasie hydraulicznej w celu ustalenia zabarwienia, odpowiadającego danemu naciskowi, w wybranym zakresie ciśnienia. Następnie zbadano rozkład nacisków między klockiem a tarczą i ustalono ich wartości, co dało pogląd na współpracę tych elementów. Pozwoliło także wyciągnąć wnioski, dotyczące funkcjonowania tych elementów tribologicznych pojazdu samochodowego oraz odnieść się do możliwości samej metody.
The article presents an assessment of the possibility of applying the nondestructive Prescale Pressure Measurement (PPM) method to evaluation the function and condition of the frictional couple type brake pad–brake disc in an automotive vehicle. An overall analysis of the potential capabilities of the method for use in car nodes was performed. The PPM film was scaled on a hydraulic press to determine the intensity of color that corresponds to the given pressure within the selected pressure range. Then, the distribution of pressure between the brake pad and the brake disc was investigated and their values were determined, which gives a view on the cooperation of these elements. It also allowed us to draw conclusions about the functioning of these tribological elements of the automotive vehicle and to refer to the possibilities of the method itself.
Źródło:
Badania Nieniszczące i Diagnostyka; 2017, 4; 22-27
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Troska duszpasterstwa rodzin o małżeńswo
The family pastorates care for the married couple
Autorzy:
Parysiewicz, Beata
Powiązania:
https://bibliotekanauki.pl/articles/31341003.pdf
Data publikacji:
2012
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
duszpasterstwo rodzin
małżeństwo
strategia pomocy
family pastorate
married couple
strategy of aid
Opis:
The article systemizes the knowledge about actions taken by the family pastorate for the Catholic married couple. The actions are referred to the marital bond in the legal, material, psychological, spiritual, moral and religious spheres. They are considered in three aspects: assumptions about help towards the couple, their realization and the main problems that appear in the work for the married couple.
Źródło:
Roczniki Pastoralno-Katechetyczne; 2012, 4; 93-102
2081-1829
Pojawia się w:
Roczniki Pastoralno-Katechetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problem legalizacji związków partnerskich osób tej samej płci w kampanii wyborczej 2011 roku
The problem of same-sex couple partnership legalization in 2011 election campaign
Autorzy:
Tomczak, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/514640.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
polish political parties
left
right
election
partnership of same-sex couple
homosexuality
Opis:
The article presents diff erences between the electorate and political parties programs in a political right point of view according to the principle of same-sex couples to certificate their relations. Parties of the left such as the Democratic Left Alliance (Sojusz Lewicy Demokratycznej) and Palikot`s Movement (Ruch Palikota) tried to support the idea of the same-sex couple partnerships however they didn’t try to make them equal with the ordinary marriages. The voters of those parties where more often ready to accept the same-sex couple partnerships, nevertheless the right side pulls in the opposite electorate. Most of the Civic Platform (Platforma Obywatelska RP) voters didn’t support the same-sex couples partnership idea, that kind of attitude dominate the Law and Justice (Prawo i Sprawiedliwość) electorate too. Nowadays the aversion to the same-sex couples rights can be clearly seen among the whole society. During the 2011 campaign also clearly become the increase of support for the same-sex couples partnership over the previous year especially in political left wing of electorate. Social ratio to the main aspects of the article divines polish political parties as much as the most of the voters, creating a big line between the left and the right side of polish politics.
Źródło:
Political Preferences; 2012, 3; 237-249
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of flow and heat transfer in hydromagnetic micropolar fluid between two stretchable disks with viscous dissipation effects
Autorzy:
Ali, K.
Ahmad, S.
Ashraf, M.
Powiązania:
https://bibliotekanauki.pl/articles/279778.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
MHD
micropolar fluid
stretchable disk
viscous dissipation
couple stress
heat transfer rate
Opis:
A study of magnetohydrodynamic (MHD) flow with viscous dissipation and heat transfer in an electrically conducting laminar steady viscous incompressible micropolar fluid between two infinite uniformly stretching disks is presented. The transformed self similar nonlinear ODEs are first linearized using a quasi linearization method and then solved by employing a combination of a direct and an iterative method. The study may be beneficial to flow and thermal control of polymeric processing.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 633-643
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration of a hyper-elastic microbeam using a new “augmented Biderman model”
Autorzy:
Karami Mohammadi, Ardeshir
Danaee Barforooshi, Saeed
Powiązania:
https://bibliotekanauki.pl/articles/949138.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear vibration
hyper-elastic microbeam
augmented Biderman model
modified couple stress theory
Opis:
A new augmented Biderman model inspired by the modified couple stress theory has been introduced to investigate the size effect in addition to nonlinear material effects. Then, this model is used to investigate free vibration of a hyper-elastic microbeam. Classical Biderman strain energy does not include the effect of small size in hyper-elastic materials. In order to consider the effect of small size, terms inspired by the modified couple stress theory are added to the classical Biderman strain energy function. In order to provide the possibility of calculating these terms, a relation between the material constants in the hyper-elastic Biderman model and the linear elastic constants is obtained. The equations of motion of the microbeam is obtained based on the extended Hamilton principle, and then is solved using Galerkin discretization and perturbation methods. The effect of thickness to length scale ratio on the normalized frequency is studied for different modes. It is shown that when thickness gets larger in comparison with the length scale parameter, the normalized frequency tends to classical Biderman results. The results obtained are validated by results of the Runge-Kutta numerical method and indicate an excellent agreement. Mode shapes of the microbeam based on the classical and the augmented models are depicted, where the augmented model anticipates stiffer behavior for hyperelastic microbeams.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 739-750
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A rebuttal of recent arguments for Maragha influence on Copernicus
Autorzy:
Blåsjö, Viktor
Powiązania:
https://bibliotekanauki.pl/articles/783488.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Umiejętności
Tematy:
Copernicus
Maragha school
Tusi couple
harmonic motion
Kopernik
mechanizm Tusiego
ruch harmoniczny
Opis:
I reply to recent arguments by Peter Barker & Tofigh Heidarzadeh, Arun Bala, and F. Jamil Ragep claiming that certain aspects Copernicus’s astronomical models where influenced by late Islamic authors connected with the Maragha school. In particular, I argue that: the deleted passage in De revolutionibus that allegedly references unspecified previous authors on the Tusi couple actually refers to a simple harmonic motion, and not the Tusi couple; the arguments based on lettering and other conventions used in Copernicus’s figure for the Tusi couple have no evidentiary merit whatever; alleged indications that Nicole Oresme was aware of the Tusi couple are much more naturally explained on other grounds; plausibility considerations regarding the status of Arabic astronomy and norms regarding novelty claims weight against the influence thesis, not for it.
Odpowiadam na ostatnie argumenty Petera Barkera i Tofigh Heidarzadeha, Aruna Bali i F. Jamila Ragepa, wedle których na pewne aspekty modeli astronomicznych Kopernika wywarli wpływ późni islamscy autorzy związani ze szkołą w Maragha. W szczególności argumentuję, że: skreślony fragment De revolutionibus, który rzekomo odnosi się do bliżej nieokreślonych poprzednich autorów analizujących mechanizm Tusiego, faktycznie odnosi się do prostego ruchu harmonicznego; argumenty oparte na symbolach literowych i innych konwencjach wykresu Kopernika dla mechanizmu Tusiego nie mają żadnej wartości dowodowej; domniemane oznaki, że Nicole Oresme był świadomy istnienia mechanizmu Tusiego, są znacznie bardziej naturalnie wyjaśnione na innych podstawach; względy dotyczące wiarygodności statusu arabskiej astronomii i normy dotyczące idei nowatorstwa w nauce przemawiają przeciwko tezie o wpływie na Kopernika islamskich autorów związanych ze szkołą w Maragha.
Źródło:
Studia Historiae Scientiarum; 2018, 17
2451-3202
Pojawia się w:
Studia Historiae Scientiarum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed convective flow of unsteady hydromagnetic couple stress fluid through a vertical channel filled with porous medium
Autorzy:
Makhalemele, C. R.
Rundora, L.
Adesanya, S. O.
Powiązania:
https://bibliotekanauki.pl/articles/1839697.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
magnetohydrodynamika
przepływ oscylacyjny
couple stress fluid
mixed convection
magnetohydrodynamics
oscillatory flow
Opis:
In this paper, the mixed convective flow of an electrically conducting, viscous incompressible couple stress fluid through a vertical channel filled with a saturated porous medium has been investigated. The fluid is assumed to be driven by both buoyancy force and oscillatory pressure gradient parallel to the channel plates. A uniform magnetic field of strength 0B is imposed transverse to the channel boundaries. The temperature of the right channel plate is assumed to vary periodically, and the temperature difference between the plates is high enough to induce radiative heat transfer. Under these assumptions, the equations governing the two-dimensional couple stress fluid flow are formulated and exact solutions of the velocity and the temperature fields are obtained. The effects of radiation, Hall current, porous medium permeability and other various flow parameters on the flow and heat transfer are presented graphically and discussed extensively.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 148-161
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inertia and couple-stress effects in a curvilinear thrust hydrostatic bearing
Autorzy:
Walicka, A.
Jurczak, P.
Falicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/266178.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
couple-stress lubricant
inertia effects
hydrostatic thrust bearing
efekt bezwładności
łożysko oporowe
smar
Opis:
The flow of a couple-stress lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The flow in the bearing clearance is considered with inertia forces. The equations of motion are solved by an averaged inertia method. As a result, the formulae for pressure distributions without and with inertia effects were obtained. Radial thrust bearings and spherical bearings are discussed as numerical examples. It is shown that inertia effects influence the bearing performance considerably.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 759-767
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of the micropolar fluid flow and heat transfer in a channel with a shrinking and a stationary wall
Autorzy:
Ali, K.
Ashraf, M.
Powiązania:
https://bibliotekanauki.pl/articles/949324.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
channel flow
shrinking/stationary walls
couple stress
quasi-linearization
Joule heating
viscous dissipation
Opis:
We present the numerical study of hydromagnetic (MHD) flow and heat transfer characte- ristics of a viscous incompressible electrically conducting micropolar fluid in a channel with one wall shrinking and the other at rest in the presence of a transverse applied magnetic field. Different from the classical shooting methodology, we employ a combination of a di- rect and an iterative method (SOR with optimal relaxation parameter) for solving the sparse systems of linear algebraic equations arising from the FD discretization of the linearized self similar nonlinear ODEs. Effects of some physical parameters on the flow and heat transfer are discussed and presented through tables and graphs. The present investigation may be beneficial to the flow and thermal control of polymeric processing.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 557-569
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przyjaźń narzeczonych gwarancją trwałości małżeństwa
Friendship Between a Fiancé and Fiancée as a Guarantee of Stability in Marriage
Autorzy:
Wasilewski, Edward
Powiązania:
https://bibliotekanauki.pl/articles/1047551.pdf
Data publikacji:
2016-06-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
engaged couple
friendship
unanimity
virtue
graphic presentation method
narzeczeństwo
przyjaźń
jednomyślność
cnota
metoda wykresograficzna
Opis:
Współcześnie obserwujemy kryzys instytucji małżeństwa i rodziny, a jego najgroźniejszym symptomem jest ciągle wzrastająca liczba rozwodów, dotycząca nie tylko związków cywilnych, ale również małżeństw sakramentalnych. Podejmując środki zmierzające do uzdrowienia tego bolesnego zjawiska, Kościół coraz większą wagę przywiązuje do właściwego przygotowania narzeczonych do zawarcia sakramentalnego małżeństwa. W dotychczasowej praktyce niedostatecznie, być może, zwracano uwagę na potrzebę promowania ideału przyjaźni między narzeczonymi jako rękojmi trwałości zawieranych związków małżeńskich. Należy większą uwagę zwrócić na ukazanie właściwej koncepcji chrześcijańskiej przyjaźni. Pomocą w osiągnięciu tego celu może być wykorzystanie założeń metody wykresograficznej w kontekście katechezy przedmałżeńskiej.
Nowadays, we are witnessing crisis in marriage and family; its most dangerous symptom is a growing number of dissolved marriages, not only civil but also sacramental ones. Taking measures to cure this painful phenomenon, the Church is attaching more and more importance to the preparation of engaged people for sacramental marriage. So far, not too much attention was paid to the promotion of the ideal love between engaged people as a guarantee of stability in marriage. However, the idea of showing the correct concept of Christian love should be more emphasized. It can be helped by using the assumption of the graphic presentation method in premarital religious education.
Źródło:
Teologia i moralność; 2016, 11, 1(19); 225-242
1898-2964
2450-4602
Pojawia się w:
Teologia i moralność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza i ocena poprawności działania węzła tarcia w aspekcie II zasady termodynamiki
Analysis and Evaluation of the Correctness of the Function of a Friction Couple in the Aspect of the Second Law Thermodynamics
Autorzy:
Bzura, P.
Powiązania:
https://bibliotekanauki.pl/articles/341742.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
działanie węzła tarcia
entropia
hipoteza badawcza
operation of the friction couple
entropy
research hypothesis
Opis:
W artykule przedstawiono autorską metodę sprawdzania poprawności działania węzła tarcia traktowanego jako układ tribologiczny w aspekcie II zasady termodynamiki na podstawie analizy i oceny wyników badań laboratoryjnych wykonanych na stanowisku badawczym. Jako stanowisko wykorzystany został zmodyfikowany węzeł tarcia aparatu czterokulowego T-02. Zaprezentowano algorytm, według którego zostały wykonane badania empiryczne. Wykazano, że wyniki badań potwierdziły przydatność metody określania entropii całkowitej węzła tarcia do analizy działania „szkodliwego”, umożliwiającej ocenę przydatności płynu smarującego do wytwarzania warstwy smarującej. Na podstawie analizy wyników sformułowano także hipotezę badawczą, z której wynika, że zmiana średniej entropii całkowitej węzła tarcia świadczy o zmianie działania węzła tarcia. Hipoteza ta została zweryfikowana na podstawie testu Anova z uwzględnieniem statystyki Fishera LSD.
The article presents an authorial method for checking the correctness of the operation of a friction couple, treated as a tribological system in the aspect of the second law of thermodynamics, based on the analysis and evaluation of the results of laboratory tests performed on the test stand. A modified friction couple of the T-02 four-ball device was used as a test stand. An algorithm was presented, according to which empirical studies were performed. It was demonstrated that the test results confirmed the usefulness of the method of determining the total entropy of the friction couple for the analysis of the "harmful" action, enabling the assessment of the suitability of the lubricating fluid for the formation of lubricating film. The hypothesis was also formulated based on the analysis of results, which shows that the change in the average total entropy of the friction couple is indicative of a change in mode of action of the friction couple. This hypothesis was verified on the basis of the Anova test, taking Fisher LSD statistic into account.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2018, 108; 22-33
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of stenosis and dilatation on flow of blood mixed with suspended nanoparticles: a study using homotopy technique
Autorzy:
Sudha, T.
Umadevi, C.
Dhange, M.
Manna, S.
Misra, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/1839885.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ krwi
zwężenie tętnicy
ciśnienie krwi
stenosis
dilatation
couple stress fluid
impedance
shear stress
Opis:
The paper deals with a theoretical study on blood flow in a stenosed segment of an artery, when blood is mixed with nano-particles. Blood is treated here as a couple stress fluid. Stenosis is known to impede blood flow and to be the cause of different cardiac diseases. Since the arterial wall is weakened due to arterial stenosis, it may lead to dilatation /aneurysm. The homotopy perturbation technique is employed to determine the solution to the problem for the case of mild stenosis. Analytical expressions for velocity, shear stress at the wall, pressure drop, and flow resistance are derived. The impact of different physical constants on the wall shear stress and impedance of the fluid is examined by numerical simulation. Streamline patterns of the nanofluid are investigated for different situations.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 251-265
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analytical study of couple stress fluid through a sphere with an influence of the magnetic field
Autorzy:
Krishna Prasad, Madasu
Sarkar, Priya
Powiązania:
https://bibliotekanauki.pl/articles/2202037.pdf
Data publikacji:
2022
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
creeping flow
sphere
magnetic effect
couple stress fluid
drag
przepływ pełzający
kula
efekt magnetyczny
Opis:
The present work concerns to study of the steady, axisymmetric slow flow of couple stress fluid through a rigid sphere in the transverse magnetic field. Boundary conditions on the sphere surface are the zero couple stress condition and tangential slip condition. The stream function, vorticity vector, and pressure term are obtained. The drag acting on the sphere in the presence of MHD is calculated. Here, we graphically represented the Hartmann number, couple stress, and slip parameters effect on the drag coefficient. Some well-known results of the drag are deduced.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 99--110
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slow flow of couple stress fluid past a cylinder embedded in a porous medium: slip effect
Autorzy:
Sarkar, Priya
Madasu, Krishna Prasad
Powiązania:
https://bibliotekanauki.pl/articles/38911649.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
couple stress fluid
cylinder
Brinkman’s equation
saturated porous medium
slip coefficients
drag force
Opis:
An analytical study for the creeping flow of a couple stress fluid past a cylinder embedded in a porous medium is presented using the slip condition. The uniform flow is considered far away from a cylinder. The boundary conditions used are zero couple stress and tangential slip conditions. The modified Bessel functions represent the stream function (the velocity). The drag exerted on a solid cylinder immersed in a porous medium is derived. The impacts of the couple stress, permeability, and slip parameters on the normalized drag force are presented graphically. The drag forces of well-known exceptional cases are reduced. The drag force is a decreasing function of the permeability and couple stress parameters and an increasing function of the slip parameter.
Źródło:
Engineering Transactions; 2023, 71, 4; 537-551
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient dynamic analysis of functionally graded micro-beams considering small-scale effects
Autorzy:
Eshraghi, I.
Dag, S.
Powiązania:
https://bibliotekanauki.pl/articles/38627524.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
boundary element method
functionally graded materials
Timoshenko micro-beam
vibrations
modified couple stress theory
Opis:
A domain-boundary element method, based on modified couple stress theory, is developed for transient dynamic analysis of functionally graded micro-beams. Incorporating static fundamental solutions as weight functions in weighted residual expressions, governing partial differential equations of motion are converted to a set of coupled integral equations. A system of ordinary differential equations in time is obtained by domain discretization and solved using the Houbolt time marching scheme. Developed procedures are verified through comparisons to the results available in the literature for micro- and macro-scale beams. Numerical results illustrate elastodynamic responses of graded micro-beams subjected to various loading types. It is shown that metal-rich micro-beams and those with a smaller length scale parameter ratio undergo higher displacements and are subjected to larger normal stresses.
Źródło:
Archives of Mechanics; 2021, 73, 4; 303-337
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rodzina jako obszar tworzenia tożsamości
Autorzy:
Wieradzka-Pilarczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1047079.pdf
Data publikacji:
2019-10-03
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
narzeczeni
rodzina
statusy tożsamości
tożsamość osobowa
wychowanie
engaged couple
family
indetity statuses
personal indentity
upbringing
Opis:
W artykule podjęto tematykę roli rodziny w procesie kształtowania tożsamości. Tożsamość rozumiana jest jako wynik osobistej autorefleksji nad własnymi potrzebami, celami, zasobami, co w konfrontacji z zebranymi i przetworzonym informacjami na temat siebie, pozwala odpowiedzieć młodemu człowiekowi na podstawowe tożsamościowe pytanie: Kim jestem? Prezentowany tekst ukazuje uwarunkowania rozwoju tożsamości, skupia się na opisie predyspozycji i kompetencji rodzinnych potrzebnych do rozwiązania tożsamościowego zamętu oraz korzystnego i niekorzystnego zachowania dorosłych wpływającego na kształtowanie się różnych typów tożsamości.
Źródło:
Teologia i moralność; 2019, 14, 1(25); 181-196
1898-2964
2450-4602
Pojawia się w:
Teologia i moralność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compressible analysis of Bénard convection of magneto rotatory couple-stress fluid
Autorzy:
Mehta, C. B.
Singh, M.
Powiązania:
https://bibliotekanauki.pl/articles/264669.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja termiczna
pole magnetyczne
rotacja
ściśliwość
couple-stress fluid
compressibility
rotation
magnetic field
thermal convection
Opis:
Thermal Instability (Benard’s Convection) in the presence of uniform rotation and uniform magnetic field (separately) is studied. Using the linearized stability theory and normal mode analyses the dispersion relation is obtained in each case. In the case of rotatory Benard’s stationary convection compressibility and rotation postpone the onset of convection whereas the couple-stress have duel character onset of convection depending on rotation parameter. While in the absence of rotation couple-stress always postpones the onset of convection. On the other hand, magnetic field on thermal instability problem on couple-stress fluid for stationary convection couple-stress parameter and magnetic field postpones the onset of convection. The effect of compressibility also postpones the onset of convection in both cases as rotation and magnetic field. Graphs have been plotted by giving numerical values to the parameters to depict the stationary characteristics. Further, the magnetic field and rotation are found to introduce oscillatory modes which were non-existent in their absence and then the principle of exchange of stability is valid. The sufficient conditions for non-existence of overstability are also obtained.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 91-105
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convective flow of hydromagnetic couple stress fluid with varying heating through vertical channel
Autorzy:
Makhalemele, C. R.
Rundora, L.
Adesanya, S. O.
Powiązania:
https://bibliotekanauki.pl/articles/1839878.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
płyn nieściśliwy
wymiana ciepła
induced magnetic field
couple stresses
vertical channel
varying heating
Opis:
This article addresses the impact of magnetic field induction on the buoyancy-induced oscillatory flow of couple stress fluid with varying heating. Modelled equations for the incompressible fluid are coupled and nonlinear due to the inclusion of viscous heating and thermal effect on the fluid density. Approximate solutions are constructed and coded on a symbolic package to ease the computational complexity. Graphical representations of the symbolic solutions are presented with detailed explanations. Results of the present computation show that the effect of induced magnetic field on the oscillatory flow and heat transfer is significant and cannot be neglected.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 107-127
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration analysis of porous functionally graded piezoelectric microplates resting on an elastic medium subjected to electric voltages
Autorzy:
Wu, C.-P.
Lin, E.-L.
Powiązania:
https://bibliotekanauki.pl/articles/38695702.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
consistent couple stress theory
functionally graded material
Winkler-Pasternak foundation
piezoelectric microplates
porous microplates
vibration
Opis:
Basing on the consistent couple stress theory (CCST), we develop a unified size-dependent shear deformation theory to analyze the free vibration characteristics of simply supported, porous functionally graded (FG) piezoelectric microplates which resting on the Winkler-Pasternak foundation are subjected to electric voltages. Various CCST-based shear deformation theories can be reproduced by incorporating their corresponding shape functions, which characterize the through-thickness distributions of the shear deformations, into the unified size-dependent theory. The reproduced CCST-based plate theories include the classical plate theory (CPT), the first-order shear deformation plate theory (SDPT), Reddy’s refined SDPT, the sinusoidal SDPT, the exponential SDPT, and the hyperbolic SDPT. The unified size-dependent theory is subsequently used to determine the natural frequencies of simply supported, porous FG piezoelectric microplates and their corresponding vibration mode shapes. The effects of the material length scale parameter, the length-to-thickness ratio, the material-property gradient index, different values of the applied voltages, the porosity parameter, different porosity distribution patterns, the Winkler spring coefficient, and the shear modulus of the surrounding medium on the natural frequencies of the porous FG piezoelectric microplates are examined and appear to be significant.
Źródło:
Archives of Mechanics; 2022, 74, 6; 463-511
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dom z perspektywy współmałżonków przebywających na emigracji długookresowej. Analiza narracji autobiograficznych Polaków mieszkających w Wielkiej Brytanii
Home from the perspective of spouses staying as long-term expatriates. Analysis of autobiographical narratives of Poles living in Great Britain
Autorzy:
Kupis, Karolina
Kalus, Alicja
Mazurek, Emilia
Powiązania:
https://bibliotekanauki.pl/articles/29967418.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Wrocławski. Wydział Nauk Historycznych i Pedagogicznych. Instytut Pedagogiki. Zakład Historii Edukacji
Tematy:
biografia
dom
emigracja
narracja autobiograficzna
ojczyzna
rodzina
współmałżonkowie
biography
home
emigration
autobiographical narrative
homeland
family
couple
Opis:
Wprowadzenie. Dom to pojęcie wieloznaczne, które można analizować z wielu różnych perspektyw. Jest ono rozpatrywane w wymiarach: materialnym, społecznym, aksjologicznym, kulturowym i emocjonalnym. Doświadczenie emigracji może inicjować refleksję nad kategorią domu. Cel. Celem artykułu jest opisanie i wyjaśnienie, w jaki sposób osoby przebywające na emigracji rozumieją pojęcie dom i jakie jest ich wyobrażenie na temat tej przestrzeni. Materiały i metody. Materiał empiryczny został zgromadzony poprzez przeprowadzenie autobiograficznego wywiadu narracyjnego i analizę dokumentów osobistych. Grupę badanych stanowiło dwadzieścia osób (tj. dziesięć diad małżeńskich) pochodzących z Polski i przebywających na emigracji długookresowej w Wielkiej Brytanii. Wyniki. Dom w wymiarze materialnym stanowi fundamentalny element egzystencji, a jego brak – zarówno w ojczyźnie, jak i na emigracji – stanowi źródło problemów. Dom przez wszystkich badanych utożsamiany jest nie tylko z dachem nad głową, ale także z rodziną. Tam, gdzie jest najbliższa rodzina, tam jest dom. Wszyscy badani podejmują refleksję nad rozumieniem kraju pochodzenia i kraju przyjmującego jako (nie)domu, a ich opinie w tym zakresie są zróżnicowane. Zostały one scharakteryzowane poprzez metafory: metafora domu w globalnej wiosce, metafora domu na chwilę obecną, metafora bycia w drodze, metafora drzewa wyrwanego z korzeniami, metafora drzwi, metafora swobodnie otwieranych drzwi. Małżonkowie tworzący jedną z par określili w ten sam sposób swój stosunek do domu utożsamianego z krajem ojczystym i przyjmującym. W pozostałych parach nie było takiej zgodności, co opisuje metafora domu negocjowanego. Wnioski. Dom nie musi odwoływać się do konkretnej przestrzeni geograficznej. Domem może być dom rodzinny, w którym człowiek dorastał i się wychował. Domem może być dom pozostawiony w kraju pochodzenia, do którego się tęskni i wraca. Domem może być ten utworzony na emigracji, otwarty bądź zamknięty na wpływ kultury kraju przyjmującego. Domem może być ojczyzna, kraj przyjmujący, świat. Dom nabiera charakteru procesualnego, jest projektem dynamicznym, który „staje się” w zmiennych okolicznościach życia.
Introduction. Home is an ambiguous concept that can be analysed from many different perspectives. This concept is considered in the following dimensions: material, social, axiological, cultural, and emotional. The experience of emigration may initiate reflection on the perception of home. Aim. The aim of the article is to describe and explain how emigrants understand the concept of home and how they present it. Materials and methods. The empirical material was collected by conducting autobiographical narrative interviews and analysing personal documents. The research group consisted of 20 people (i.e., 10 marital dyads) from Poland, residing in a long-term emigration in Great Britain. Results. Home in the material dimension is a fundamental element of existence, and its absence – both in homeland and in the country of emigration – is a source of problems. Home is identified by all respondents not only as being with a roof over their heads, but also with family. Where the closest family is, the respondents believe that their home is there. All of them also reflect on the understanding of the country of origin and the country of the host as (not) home, and their opinions in this regard are varied. They have been characterized by metaphors: metaphor of home in a global village, metaphor of home for the moment, metaphor of being on the road, metaphor of an uprooted tree, metaphor of a door, metaphor of a freely opening door. One couple defined their attitude towards the home identified with the home country and the host country in the same way. There was no such agreement in the other married couples. This is characterized by another metaphor: the metaphor of the negotiated home. Conclusion. The home does not have to refer to a specific geographical space. A home can be a family home where a person grew up and was brought up. Home can be a home left in the country of origin, to which one misses and returns. A home can be one created in emigration, open or closed to the influence of the culture of the host country. Home can be the homeland, the host country, the world. The house takes on a processual character, it is a dynamic project that „becomes” in the changing circumstances of life.
Źródło:
Wychowanie w Rodzinie; 2023, XXX, (2/2023); 105-125
2082-9019
Pojawia się w:
Wychowanie w Rodzinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and transmission in non-local couple stress micropolar thermoelastic media
Autorzy:
Gupta, Deepa
Malik, Sangeeta
Kumar, Krishan
Sharma, Raj Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2174196.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termosprężystość
liczba falowa
para
non-local
thermoelastic solid
amplitude ratios
reflection
transmission
couple stress
wave number
Opis:
We have studied the problem of homogenous, isotropic non-local couple stress micropolar thermoelastic solid in the absence of body forces, couple density and heat resources. The reflection and transmission of waves at the interface of two distinct media have been investigated. It is observed that amplitude ratios of various reflected and transmitted waves are functions of wave number of incident waves and are affected by the non-local parameter of thermoelastic solid.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 53--76
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the magnetic field on the Rayleigh-Taylor instability in a couple-stress fluid
Autorzy:
Chavaraddi, K. B.
Awati, V. B.
Nandeppanavar, M. M.
Gouder, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/264667.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
materiały porowate
szybkość wzrostu
RTI
couple-stress fluid
magnetic field
porous media
growth rate
Opis:
In this study we examine the effect of the magnetic field parameter on the growth rate of the Rayleigh-Taylor instability (RTI) in a couple stress fluids. A simple theory based on fully developed flow approximations is used to derive the dispersion relation for the growth rate of the RTI. The general dispersion relation obtained using perturbation equations with appropriate boundary conditions will be reduced for the special cases of propagation and the condition of instability and stability will be obtained. In solving the problem of the R-T instability the appropriate boundary conditions will be applied. The couple-stress parameter is found to be stabilizing and the influence of the various parameters involved in the problem on the interface stability is thoroughly analyzed. The new results will be obtained by plotting the curves between the dimensionless growth rate and the dimensionless wave number for various physical parameters involved in the problem (viz. the magnetic field, couple-stress, porosity, etc.) in the problem. It is found that the magnetic field and couple-stress have a stabilization effect whereas the buoyancy force (surface tension) has a destabilization effect on the RT instability in the presence of porous media.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 611-622
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Couple stress fluid past a sphere embedded in a porous medium
Autorzy:
Madasu, Krishna Prasad
Sarkar, Priya
Powiązania:
https://bibliotekanauki.pl/articles/2065761.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sphere
couple stress fluid
saturated porous medium
Brinkman’s equation
drag force
kula
równanie Brinkmana
siła tarcia
Opis:
This paper concerns the analytical investigation of the axisymmetric and steady flow of incompressible couple stress fluid through a rigid sphere embedded in a porous medium. In the porous region, the flow field is governed by Brinkman’s equation. Here we consider uniform flow at a distance from the sphere. The boundary conditions applied on the surface of the sphere are the slip condition and zero couple stress. Analytical solution of the problem in the terms of stream function is presented by modified Bessel functions. The drag experienced by an incompressible couple stress fluid on the sphere within the porous medium is calculated. The effects of the slip parameter, the couple stress parameter, and permeability on the drag are represented graphically. Special cases of viscous flow through a sphere are obtained and the results are compared with earlier published results.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 1; 5--19
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant
Autorzy:
Abass, Basim Ajeel
Mahdi, Mushrek A.
Powiązania:
https://bibliotekanauki.pl/articles/1840900.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
elliptical journal bearing
hydrodynamic lubrication
micro-protrusions
couple-stress lubricant
non-Newtonian fluids
smarowanie hydrodynamiczne
płyny nienewtonowskie
Opis:
Elliptical bearing is characterized by low induced temperature and high stability at higher speed in comparison with the cylindrical journal bearing. The performance of such bearings can be affected by the type of oil used and its surface properties. The main goal of this work is to study the surface micro protrusion effect on the steady state operation of elliptical journal bearing lubricated with couple stress lubricant. The modified Reynolds’ equation to take into account the effects of couple stress lubricant and micro protrusions of the bearing surfaces is solved using finite difference method. The governing equations were solved using a prepared FORTRAN computer program. Pressure distribution, load carrying capacity and coefficient of friction have been studied for a bearing in laminar flow regime. The mathematical model was validated by comparing pressure results for the elliptical bearing of the present work with that obtained by Hussain et al.(1996). The obtained results demonstrate that the lubricant pressure and the load carried by the bearing decrease for the bearing with higher ellipticity factor while the load carried by the bearing increases for the bearing with higher protrusions or when using a couple stress fluid with higher couple stress variable.
Źródło:
Diagnostyka; 2021, 22, 2; 97-104
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hall currents on thermal instability of dusty couple stress fluid
Autorzy:
Aggarwal, A. K.
Verma, A.
Powiązania:
https://bibliotekanauki.pl/articles/240229.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
couple-stress fluid
dust particles
hall currents
stationary convection
oscillatory modes
magnetic field
ziarna pyłu
konwekcja
pole magnetyczne
Opis:
In this paper, effect of Hall currents on the thermal instability of couple-stress fluid permeated with dust particles has been considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For the case of stationary convection, dust particles and Hall currents are found to have destabilizing effect while couple stresses have stabilizing effect on the system. Magnetic field induced by Hall currents has stabilizing/destabilizing effect under certain conditions. It is found that due to the presence of Hall currents (hence magnetic field), oscillatory modes are produced which were non-existent in their absence.
Źródło:
Archives of Thermodynamics; 2016, 37, 3; 3-18
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection-refraction coefficients and energy ratios in couple stress micropolar thermoviscous elastic solid
Autorzy:
Sahrawat, Ravinder Kumar
Poonam, -
Powiązania:
https://bibliotekanauki.pl/articles/1839830.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prędkość fazowa
współczynnik odbicia
współczynnik załamania
micropolar
thermoviscous
phase speed
energy ratio
reflection coefficient
refraction coefficient
couple stress
Opis:
The reflection and refraction phenomenon of propagation of waves in couple stress micropolar thermoviscous elastic solid media with independent viscoelastic and micropolar properties have been studied. The structure of the model has been taken such that the plane interface is divides the given media into two half spaces in perfect contact. Here, we find that there are five waves, one of them is propagating independently while others are set of two coupled waves travelling with different speeds. Energy ratios, reflection and refraction coefficients relative to numerous reflected and refracted waves have been investigated when set of two coupled longitudinal waves and set of two coupled transverse waves strike at the interface through the solid medium. The inequality of energy ratios, refraction coefficients and reflection coefficients are evaluated numerically and presented graphically under three theories of thermoelasticity, namely, Green-Lindsay theory (GL), Lord-Shulman theory (LS), Coupled theory (CT) versus angular frequency and angle of incidence.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 47-69
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal convection of magneto compressible couple-stress fluid saturated in a porous medium with Hall current
Autorzy:
Mehta, C. B.
Singh, M.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/265186.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
ściśliwość
porowatość
prądy Hall'a
couple stress fluids
horizontal magnetic field
compressibility
porous medium
Hall currents
Opis:
An investigation is made on the effect of Hall currents on thermal instability of a compressible couple-stress fluid in the presence of a horizontal magnetic field saturated in a porous medium. The analysis is carried out within the framework of the linear stability theory and normal mode technique. A dispersion relation governing the effects of viscoelasticity, Hall currents, compressibility, magnetic field and porous medium is derived. For the stationary convection a couple-stress fluid behaves like an ordinary Newtonian fluid due to the vanishing of the viscoelastic parameter. Compressibility, the magnetic filed and couple-stress parameter have stabilizing effects on the system whereas Hall currents and medium permeability have a destabilizing effect on the system, but in the absence of Hall current couple-stress has a destabilizing effect on the system. It has been observed that oscillatory modes are introduced due to the presence of viscoelasticity, magnetic field porous medium and Hall currents which were non-existent in their absence.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 83-93
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a couple-stress Rivlin-Ericksen ferromagnetic fluid heated from below with varying gravity, rotation, magnetic field and suspended particles flowing through a porous medium
Autorzy:
Rahul
Sharma, Naveen
Powiązania:
https://bibliotekanauki.pl/articles/2174204.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
niestabilność termiczna
pole magnetyczne
płyn ferromagnetyczny
naprężenie
thermal instability
magnetic field
couple-stress fluid
ferromagnetic fluid
suspended particles
Opis:
The thermal instability of a couple-stress Rivlin-Ericksen ferromagnetic fluid with varying gravity field, suspended particles, rotation and magnetic field flowing through a porous medium is investigated. The dispersion relation has been developed and solved analytically using the normal mode approach and linear stability theory. The effect of suspended particles, rotation, couple stress, permeability and magnetic field on the fluid layer has been investigated. For stationary conventions, it is found that suspended particles always have a destabilizing effect for λ>0 and a stabilizing effect for λ<0 and couple-stress, magnetic field and permeability of the medium have a stabilizing effect on the thermal instability under certain conditions. In the absence of the rotation couple-stress has a stabilizing effect if λ >0 and a destabilizing effect if λ<0. Rotation has a stabilizing effect if λ >0 and a destabilizing effect if λ<0. In the absence of rotation permeability has a stabilizing effect if λ<0 and a destabilizing effect if λ>0. Magnetisation always has a stabilizing effect ( λ>0 or λ<0).
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 177--198
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport of MHD couple stress fluid through peristalsis in a porous medium under the influence of heat transfer and slip effects
Autorzy:
Sankad, G. C.
Nagathan, P. S.
Powiązania:
https://bibliotekanauki.pl/articles/266102.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
peristaltic flow
couple stress fluid
Darcy number
slip parameter
compliant walls
przepływ perystaltyczny
liczba Darcy'ego
parametr poślizgu
Opis:
An attempt has been made to examine the effects of magnetohydrodynamic couple stress fluid in peristaltic flow with porous medium under the impact of slip, heat transfer and wall properties. The expressions are obtained for temperature, coefficient of heat transfer and velocity. Influences of different parameters, the Hartmann number, Brinkman number and adaptability parameters on the temperature and warmth trade coefficient are discussed through outlines.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 403-414
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Percepcja sakramentalności małżeństwa u narzeczonych
Perception of the Sacramentality of Marriage among Engaged Couples
Autorzy:
Skrodzka, Maria
Pacholak, Paweł
Urbaniak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1047948.pdf
Data publikacji:
2012-06-02
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
premarital catechesis
sacrament of matrimony
premarital chastity
attitude of the engaged couple
katecheza przedślubna
sakrament małżeństwa
czystość przedmałżeńska
postawy narzeczonych
Opis:
Jedną z form przygotowania narzeczonych do sakramentu małżeństwa są katechezy przedmałżeńskie zalecane w Dyrektorium Duszpasterstwa Rodzin. Najczęściej obejmują one 10-12 katechez podejmujących najważniejsze zagadnienia dotyczące katolickiego małżeństwa i rodziny. W referacie przedstawiono krótką charakterystykę uczestników katechez oraz omówiono treści prezentowane na spotkaniach realizowanych w archidiecezji poznańskiej. Wobec rosnących wskaźników rozpadu związków małżeńskich wskazano na szczególne znaczenie rozumienia sakramentalności małżeństwa. Na podstawie wieloletnich doświadczeń uzasadniono celowość podejmowania w ramach katechez problematyki sakramentalności małżeństwa jako jednego z najważniejszych zagadnień. W ramach pracy dyplomowej wykonanej na Podyplomowym Studium Rodziny UAM dokonano oceny prowadzonych katechez w kilku parafiach Poznania, potwierdzając w ogólności pozytywny odbiór ich treści oraz formy. Przytoczono część wyników badań ankietowych dotyczących sakramentu małżeństwa i wykazano pozytywne zmiany postaw w odniesieniu do istoty sakramentalnego związku małżeńskiego. W końcowej części referatu sformułowano ogólne wnioski.
Premarital catechizing recommended in the Directory for the Pastoral Care of the Family is one of the forms of the engaged couple's preparation to the sacrament of matrimony. It includes typically 10 to 12 catechizing meetings, which apply to the most important issues of Catholic marriage and the family. The present paper provides a short characterization of the participants and the content presented during the meetings held in the Archdiocese of Poznań. An increasing rate of marriage breakdowns shows the great importance of understanding the sacramentality of marriage. On the basis of long-term experience it is purposeful to include the issue of matrimonial sacramentality within the scope of catechizing meetings as one of the most important problems. Within the framework of the present study written at AMU Postgraduate Family Studies evaluation of catechizing in several parishes in Poznan has been done, which confirmed the generally positive perception of its form and content. A part of the questionnaire results related to the sacrament of marriage have been adduced and some positive changes in the attitudes towards the essence of matrimony have been proved. In the final part of the paper some general conclusions have been formulated.
Źródło:
Teologia i moralność; 2012, 7, 2(12); 211-222
1898-2964
2450-4602
Pojawia się w:
Teologia i moralność
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 64

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