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    Wyświetlanie 1-22 z 22
    Tytuł:
    Temporal/locative inversion in Arabic
    Autorzy:
    Jarrah, Marwan
    Powiązania:
    https://bibliotekanauki.pl/articles/1121469.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    phase theory
    subject extraction
    temporal/locative inversion
    Arabic
    Opis:
    This research scrutinizes the observation that when the thematic subject is extracted (i.e. questioned) in Jordanian Arabic, temporal/locative inversion may occur. Temporal inversion occurs irrespective of the verb being transitive or intransitive, whereas locative inversion is limited to contexts with an unaccusative verb. This research argues that this distinction correlates with the base-generation of temporal/locative adjuncts; temporal adjuncts are base-generated adjoining to TP, whereas locatives are base-generated adjoining to VP. Temporal but not locative adjuncts resist fronting with vP, demand the use of a tense copula (or a tensed verb), and are not subject to deletion along with the lexical verb. With the assumption that Spec, SubjP must be filled with a non-silent copy due to the effects of the so-called Subject Criterion (Rizzi and Shlonsky 2007), a temporal or locative adjunct, if any, fills this position instead of the extracted thematic subject. Given its low position, a locative adjunct is accessible to Subj0 only when there is no v*P, hence the account of the correlation between locative inversion and the type of the verb. Furthermore, this research explores the existence of temporal/locative inversion in other two Arabic dialects (Najdi Arabic and Iraqi Arabic), arguing for a micro-parametric view of this strategy across Arabic dialects.
    Źródło:
    Yearbook of the Poznań Linguistic Meeting; 2017, 3, 1; 117-140
    2449-7525
    Pojawia się w:
    Yearbook of the Poznań Linguistic Meeting
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sentence-final particles in multiple phases? Some evidence from language contact
    Autorzy:
    Chan, Tsan Tsai
    Powiązania:
    https://bibliotekanauki.pl/articles/2135317.pdf
    Data publikacji:
    2021-09-25
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sentence-final particles
    cartography
    Phase Theory
    language contact
    Cantonese
    Opis:
    Cinque’s (1999) cartographic theory associates one meaning with one functional head. As such, if applied to sentence-final particles (SFPs), cartographic assumptions ought to group semantically similar SFPs onto the same functional head cross-linguistically (cf. Pan 2019; Sybesma & Li 2007). However, I show that aspectual and restrictive focus SFPs in Cantonese and Mandarin (Sinitic, Sino-Tibetan) seemingly contradict Cinque by occupying different structural positions despite their semantic closeness. To shed light on the problem, I adduce novel data from Guangzhou Cantonese and Singapore Cantonese, demonstrating that SFPs borrowed into these varieties are treated differently according to their structural height. Likewise citing scopal and other facts, I ultimately make a case for placing SFPs in multiple phases (Chomsky 2000 etc.), following Erlewine (2017) and Biberauer (2017), but contra Pan (2019), a.o. To accommodate Cinque (1999), I ultimately submit that different-phase SFPs constitute distinct lexical classes, which each cluster separately, but in the same semantically determined sequence compatible with cartographic assumptions.
    Źródło:
    Yearbook of the Poznań Linguistic Meeting; 2021, 7, 1; 1-41
    2449-7525
    Pojawia się w:
    Yearbook of the Poznań Linguistic Meeting
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zum Phasen-Modell in der Syntax
    Autorzy:
    Mecner, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/913061.pdf
    Data publikacji:
    2018-12-07
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    biolinguistics
    generative grammar
    syntax
    phase theory
    Yiddish
    unaccusatives
    final subject
    Opis:
    The article examines some aspects of the modern syntax and algorithmic modeling. In 1974, in Dedham, Massachusetts, an international meeting took place which paved the way for the interdisciplinary research field of biolinguistics. The key focus area was syntax, its hierarchical structure and system of discrete infinity, unusual for the biological world. Here, some aspects of computational efficiency are analyzed in recent generative frameworks: operation Merge, the probe-goal system and the concept of the phase, among others. The aim of this article is to investigate an intriguing structure with final subject of unaccusatives in Yiddish, a Germanic language with Slavonic influences, and to show phase structures, feature inheritance, probe-goal, and a cyclic transfer system
    Źródło:
    Glottodidactica. An International Journal of Applied Linguistics; 2018, 45, 2; 229-241
    0072-4769
    Pojawia się w:
    Glottodidactica. An International Journal of Applied Linguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refined multi-phase-lags theory and Thomson effect on a micropolar thermoelastic medium with voids
    Autorzy:
    Alharbi, Amnah M.
    Abd-Elaziz, Elsayed M.
    Othman, Mohamed I.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955005.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar
    voids
    refined-phase-lags theory
    thomson effect
    normal mode
    analysis
    Opis:
    The problem considered is that of an isotropic, micropolar thermoelastic medium with voids subjected to the Thomson effect. The solution to the problem is presented in the context of the refined multiphase-lags theory of thermoelasticity. The normal mode analysis was used to obtain the analytical expressions of the considered variables. The nondimensional displacement, temperature, microrotation, the change in the volume fraction field and stress of the material are obtained and illustrated graphically. The variations of these quantities have been depicted graphically in the refined-phase-lag theory, Green and Naghdi theory of type II, Lord and Shulman theory and a coupled theory. The effects of the Thomson parameter and phase lag parameters on a homogeneous, isotropic, micropolar thermoelastic material with voids are revealed and discussed. Some particular cases of interest are deduced from the present investigation.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 279--309
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of a solid product with high water content and water retention properties
    Autorzy:
    Cvijić, Marko
    Golob, Janvit
    Powiązania:
    https://bibliotekanauki.pl/articles/778509.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    water in organic phase emulsion
    phase equilibrium
    mass transfer
    Luikov’s parameters
    theory of drying
    Opis:
    This work presents the development of a solid product with a high water content (99.08%) and water retention properties. Water was chosen as a potential carrier of a volatile active substance and water retaining properties of material were studied at a temperatures and relative air humidity values with the support of the theory of drying. The study first confirmed the role of Gibbs’ phase rule in the research of solid-gas phase equilibrium, and second presented drying kinetics developed from Fick’s second law and expressed with the first term of the Fourier equation. Solutions of equations for phase equilibrium and mass transfer enabled the calculation of Luikov’s parameters, which are important for equilibrium relations and for the diffusivity of water in a solid for mass transfer prediction. The obtained thermodynamic and kinetic parameters enabled product characterisation that may be important for the prediction of retention times.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 17-23
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decomposition Pathways for Aqueous Hydroxylammonium Nitrate Solutions: a DFT Study
    Autorzy:
    Izato, Y.
    Koshi, M.
    Miyake, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/357968.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    hydroxylamine nitrate
    reaction pathway
    liquid-phase reaction
    density functional theory
    Opis:
    Hydroxylammmonium nitrate (hydroxylamine nitrate, HAN) is one of the most promising candidates as a replacement for commonly used liquid mono-propellants such as hydrazine. The reaction pathways involved in the initial and the catalytic decomposition of HAN in aqueous solution were determined using quantum chemistry calculations incorporating solvent effects. Optimized structures were obtained for the reactants, products and transition states at the ωB97XD/6-311++G(d,p)/SCRF = (solvent = water) level of theory and the total electron energies of these structures were calculated at the CBS-QB3 level of theory. In the initial decomposition, the ion-neutral NH3OH+-HNO3 reaction, the neutral-neutral NH3O-HNO3 reaction and the HNO3 self-decomposition pathways were all found to have reasonable energy barriers, with values of 91.7 kJ/mol, 88.7 kJ/mol and 89.8 kJ/mol, respectively. The overall reaction resulting from any of these pathways can be written as: HAN → HONO + HNO + H2O. The ionic reaction is dominant during the initial decomposition of HAN in aqueous solution because NH3OH+ and NO3– are the major species in such solutions. We also developed six catalytic mechanisms and each of these schemes provided the same global reaction: NH2OH + HONO → N2O + 2H2O. The t-ONONO2 oxidizing scheme is the most plausible based on the energy barrier results.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 888-916
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensed Geometry II: New Constraints, Temporal Confinement Phase and Structure and Interpretation of Space and Time
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1190218.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ashtekar variables
    Loop Quantum Gravity
    surface states
    phase transitions
    string theory
    Opis:
    In this paper we basically intend to deductively study aspects and physical behavior of time in the Quantum Mechanical and Loop Quantum Gravity regime and the physical interpretations therein. The implicit gauge invariance of the vortical time is deduced. A new form of the Hamiltonian constraint is produced and the corresponding Vector or Diffeomorphism constraint is also introduced, the Gauss constraint being found to be the same as that in the original. The new consequences are discussed. The paper presents fresh new ideas and interpretations as well as perspectives on the spatial as well as the now introduced temporal aspects of Loop Quantum Gravity. In this we basically intend to deductively study aspects and physical behavior of Time in the Quantum Mechanical and Loop quantum gravity regime and the physical interpretations therein. In what follows, we provide a systematic mathematico-physical treatment of the vortical aspect of quantum gravity or a test quantum system, relative to space, as the time for that system. The implicit gauge invariance of the vortical time is deduced. A general theory of implicit and explicit gauge invariance is proposed. The gauging out of the acausality gauge degree of freedom is deduced and the causal direction of time is shown to nucleate out as a self ordered criticality due to a “tweaking” field which is shown to be a form of magnetic phase transition. This magnetic phase arising in the Kodama holomorphic wave functional universe, arises naturally due to the Ashtekar “magnetic” field in general. Also the wave-particle duality of gravity/ geometry as a quantum system is interpreted in terms of the physical role played by time. The long standing problem of the interpretation of the quantum mechanical time-inverse temperature has apriori been resolved with a heuristic interpretation. As an epilogue, the Pauli theorem on time as an operator has been discussed along with the standard proof.
    Źródło:
    World Scientific News; 2016, 44; 236-256
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wady teorii mocy w obwodach jednofazowych według Budeanu i Fryzego
    Disadvantages of the Budeanu and Fryze power theory in single-phase circuit
    Autorzy:
    Zajkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/316702.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    teoria mocy
    definicja mocy
    obwód jednofazowy
    teoria Fryzego
    teoria Budeanu
    power theory
    power definition
    single-phase circuit
    Fryze theory
    Budeanu theory
    Opis:
    W artykule przedstawiono dwie definicje mocy opracowane w pierwszej połowie XX wieku, które do dziś są wykorzystywane w teorii mocy. Następnie omówiono błędy tych metod. Analizę oparto na przykładach, sprawdzających założenia teoretyczne tych metod. Współczesne definicje mocy bazują na teoriach Budeanu i Fryzego, dlatego ważne jest przypominanie środowisku naukowemu o ograniczeniach i niejednoznacznościach w nich ukrytych. Tematyka artykułu jest również aktualna z powodu rozwoju napędu elektrycznego w środkach transportu publicznego.
    The article presents two definitions of power, which were developed in the first half of the twentieth century and are used in the theory of power to this day. Then, errors in these methods are discussed. The analysis is based on examples that checked theoretical assumptions of these methods. Contemporary definitions of power are based on Budeanu and Fryze theories, so it is important to remind the scientific community about the limitations and errors in them hidden. The subject of this article is also valid because of the development of electric drive on public transport.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1500-1504
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double phase problems: a survey of some recent results
    Autorzy:
    Papageorgiou, Nikolaos S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048893.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    double phase integrand
    generalized Orlicz spaces
    regularity theory
    maximum principle
    Nehari manifold
    Opis:
    We review some recent results on double phase problems. We focus on the relevant function space framework, which is provided by the generalized Orlicz spaces. We also describe the basic tools and methods used to deal with double phase problems, given that there is no global regularity theory for these problems.
    Źródło:
    Opuscula Mathematica; 2022, 42, 2; 257-278
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Memory response on generalized thermoelastic medium in context of dual phase lag thermoelasticity with non-local effect
    Autorzy:
    Tiwari, R.
    Saeed, A. M.
    Kumar, R.
    Kumar, A.
    Singhal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/38694222.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    memory dependent derivative
    time-delay
    kernel function
    non-local
    continuum theory
    dual phase lags
    Opis:
    Theory of non-local continuum is contemporary appraised and is found to be supplementary coherent to capture the impacts of each and every point of the material at its single point. The conviction of memory dependent derivative is also newly appraised and is observed to be more intuitionistic for predicting the realistic character of the real-world obstacles. Attractiveness of the belief of a memory dependent derivative lies in its unique properties such as its significant constituents – a kernel function and time-delay are freely selected according to the requirement of a problem. The present study comprises a new meticulous thermoelastic heat conduction model for the homogeneous, isotropic, thermoelastic half space medium concerning memory effects and non-local effects. Governing equations are constructed on the basis of the newly appraised non-local generalized theory of thermoelasticity with two phase lags in the frame of a memory dependent derivative. Exact analytical solutions of the physical fields such as dimensionless temperature, displacement as well as thermal stress are evaluated by using a suitable technique of the Laplace transform. Quantitative results are determined in a time-domain for different values of time by taking the numerical inversion of the Laplace transform. Noteworthy role of the constituents of the memory dependent derivative such as kernel function as well as time-delay factor has been scrutinized on the crucial field variables of the medium through computational outcomes. Moreover, the impact of non-local parameter is examined on the variations of field quantities through the quantitative results.
    Źródło:
    Archives of Mechanics; 2022, 74, 2-3; 69-88
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Matrix Notation for the Analysis of Power Changes in a 3‑phase Circuit
    Wykorzystanie zapisu macierzowego do analizy zmian mocy w obwodzie 3-fazowym
    Autorzy:
    Ładniak, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/397235.pdf
    Data publikacji:
    2016
    Wydawca:
    ENERGA
    Tematy:
    system 3-fazowy
    teoria mocy
    rachunek macierzowy
    three-phase system
    power theory
    matrix calculus
    Opis:
    Using the matrix notation for voltages and currents of a 3-phase system, a description of changing the instantaneous power on terminals of electric circuit has been offered as a third rank matrix. As a result of the power matrix’ decomposition into a symmetric matrix and an antisymmetric matrix and upon defining norms for these matrices the state of the 3-phase circuit can be clearly determined.
    Korzystając z zapisu macierzowego napięć i prądów występujących w węźle obwodu 3-fazowego, zaproponowano opis zmian wartości chwilowych mocy na zaciskach rozpatrywanego układu w postaci macierzy trzeciego stopnia. W wyniku dekompozycji macierzy mocy na macierz symetryczną i antysymetryczną oraz po zdefiniowaniu norm dla tych macierzy można w jednoznaczny sposób określić stan układu 3-fazowego.
    Źródło:
    Acta Energetica; 2016, 2; 149-152
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-phase power active filter using instantaneous reactive power theory : theoretical and practical approach
    Autorzy:
    Altus, J.
    Michalik, J.
    Dobrucky, B.
    Viet, L. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/262653.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    power active filter
    p-q power theory
    orthogonal transformations
    single-phase system
    fictitous virtual quantity
    Opis:
    The paper deals with the new method of analysis, synthesis and experimentation of single-phase power active filters. By using a new particular transformation theory, the ordinary single-phase system can be transformed into an equivalent two-axes orthogonal one. The new original thought is based on the idea that ordinary single-phase quantity can be complemented bv fictitious second phase so that both of them will create an orthogonal system, as is usual in three-phase systems, in spite of [1]. Application of the above theory makes it possible to use complex methods of analysis as the instantaneous reactive power method, which have not been usable for single-phase systems so far. Both, the active and reactive powers can be determined by this way. Practical application of the method is outlined for the case of reference current determination for single-phase power active filter. The paper shows some examples of the simu-lution verification results, which proved a high accuracy and extremely fast response of the single-phase active filter with control, based on the introduced method. The effectiveness of proposed control algorithm is also demonstrated by experimental results, which were carried out on the single - phase active parallel filter, power rate of 25 kVA and controlled by 32 - bit Heating point digital signal processor TMS 320C31.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 33-38
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meta-stable solidification created by the detonation method of coating formation
    Autorzy:
    Wołczyński, W.
    Garzeł, G.
    Morgiel, J.
    Senderowski, C.
    Pawłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382812.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krystalizacja
    krzepnięcie szybkie
    powłoka Fe-Al
    faza amorficzna
    theory of crystallization
    rapid solidification process
    Fe-Al coating
    meta-stable phase diagram
    amorphous phase
    Opis:
    Particles of the Fe-Al type (less than 50 m in diameter) were sprayed onto the 045 steel substrate by means of the detonation method. The TEM, SAED and EDX analyses revealed that the Fe-Al particles have been partially melted in the experiment of coating formation. Particle undergone melting even within about 80% of its volume. Therefore, solidification of the melted part of particles was expected. Solidification differed significantly due to a large range of chemical composition of applied particles (from 15 at.% Al up to 63 at.% Al). A single particle containing 63 at.% Al was subjected to the detailed analysis, only. The TEM / SAED techniques revealed in the solidified part of particle three sub-layers: an amorphous phase, [...] , periodically situated FeAl + Fe2Al5 phases, and a non-equilibrium phase, [...]. A hypothesis dealing with the inter-metallic phases formation in such a single particle of the nominal composition No = 0.63 is presented. At first, the solid / liquid system is treated as an interconnection: substrate / liquid / nonmelted particle part . Therefore, it is suggested that the solidification occurs simultaneously in two directions: towards a substrate and towards a non-melted part of particle. The solidification mechanism is referred to the Fe-Al meta-stable phase diagram. It is shown that the melted part of particle solidifies rapidly according to the phase diagram of meta-stable equilibrium and at a significant deviation from the thermodynamic equilibrium.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 93-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hamilton-Jacobi/ Canonical Phase Transitions of Ashtekar LQG-Polyakov Strings: World Sheet Dynamics as Regelation through the d = 3 + 1 Spacetime
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1179195.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ashtekar connectio-dynamics
    Loop Quantum Gravity
    Nambu-Goto action
    Polyakov path integral
    phase transitions
    string theory
    Opis:
    The following paper takes up an Ashtekar connectio-dynamics and algebraic quantum field theoretic treatment of a relativistic quantum string without SUSY and hence in four spacetime dimensions treats the Polyakov dynamics of a relativistic quantum string given explicitly by the Polyakov path integral in terms of a “canonical” phase transition where the string is imagined as a thread regelating through the “ice cube” of spacetime.
    Źródło:
    World Scientific News; 2017, 83; 206-211
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics coefficient for two-phase soil model
    Autorzy:
    Wrana, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/178585.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dynamic consolidation
    Biot theory
    dynamics
    two-phase soil model
    teoria Biota
    dynamika
    dwufazowy model gleby
    konsolidacja dynamiczna
    Opis:
    The paper investigates a description of energy dissipation within saturated soils-diffusion of pore-water. Soils are assumed to be two-phase poro-elastic materials, the grain skeleton of which exhibits no irreversible behavior or structural hysteretic damping. Description of motion and deformation of soil is introduced as a system of equations consisting of governing dynamic consolidation equations based on Biot theory. Selected constitutive and kinematic relations for small strains and rotation are used. This paper derives a closed form of analytical solution that characterizes the energy dissipation during steady-state vibrations of nearly and fully saturated poro-elastic columns. Moreover, the paper examines the influence of various physical factors on the fundamental period, maximum amplitude and the fraction of critical damping of the Biot column. Also the so-called dynamic coefficient which shows amplification or attenuation of dynamic response is considered.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 2; 51-56
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrations in a fluid-loaded poroelastic hollow cylinder surrounded by a fluid in plane-strain form
    Autorzy:
    Shanker, B.
    Nath, C. N.
    Shah, S. A.
    Reddy, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265190.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    teoria Biota
    częstotliwość
    wibracje
    prędkość fazowa
    Biot's theory
    fluid-loaded poroelastic cylinder
    frequency
    planestrain vibrations
    phase velocity
    Opis:
    Plane-strain vibrations in a fluid-loaded poroelastic hollow cylinder surrounded by a fluid are investigated employing Biot’s theory of wave propagation in poroelastic media. The poroelastic hollow cylinder is homogeneous and isotropic, while the inner and outer fluids are homogeneous, isotropic and inviscid. The frequency equation of the fluid-loaded poroelastic cylinder surrounded by a fluid is obtained along with several particular cases, namely, fluid-loaded poroelastic cylinder, fluid-loaded bore, poroelastic cylinder surrounded by a fluid and poroelastic solid cylinder submerged in a fluid. The frequency equations are obtained for axially symmetric, flexural and anti-symmetric vibrations each for a pervious and an impervious surface. Nondimensional frequency for propagating modes is computed as a function of the ratio of thickness to the inner radius of the core. The results are presented graphically for two types of poroelastic cylinders and then discussed.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 189-216
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of diffusion and internal heat source on a two-temperature thermoelastic medium with three-phase-lag model
    Autorzy:
    Othman, M. I.
    Said, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240881.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diffusion
    Green-Naghdi theory
    internal heat source
    three-phase-lag model
    two-temperature
    dyfuzja
    teoria Greena-Naghdiego
    źródło ciepła
    Opis:
    The purpose of this paper is to depict the effect of diffusion and internal heat source on a two-temperature magneto-thermoelastic medium. The effect of magnetic field on two-temperature thermoelastic medium within the three-phase-lag model and Green-Naghdi theory without energy dissipation i discussed. The analytical method used to obtain the formula of the physical quantities is the normal mode analysis. Numerical results for the field quantities given in the physical domain are illustrated on the graphs. Comparisons are made with results of the two models with and without diffusion as well as the internal heat source and in the absence and presence of a magnetic field.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 2; 15-39
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A first-order spectral phase transition in a class of periodically modulated Hermitian Jacobi matrices
    Autorzy:
    Pchelintseva, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/255740.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Jacobi matrices
    spectral phase transition
    absolutely continuous spectrum
    pure point spectrum
    discrete spectrum
    subordinacy theory
    asymptotics of generalized eigenvectors
    Opis:
    We consider self-adjoint unbounded Jacobi matrices with diagonal q(n) = b(n)n and off-diagonal entries λ(n) = n, where b(n) is a 2-periodical sequence of real numbers. The parameter space is decomposed into several separate regions, where the spectrum of the operator is either purely absolutely continuous or discrete. We study the situation where the spectral phase transition occurs, namely the case of b(1)b(2) = 4. The main motive of the paper is the investigation of asymptotics of generalized eigenvectors of the Jacobi matrix. The pure point part of the spectrum is analyzed in detail.
    Źródło:
    Opuscula Mathematica; 2008, 28, 2; 137-150
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic cylinders
    Autorzy:
    Ahmed Shah, S.
    Javvad Hussaini, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/955126.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    prędkość fazowa
    tłumienie drgań podłużnych
    teoria Biota
    Biot's theory
    hollow cylinder
    shear waves
    frequency equation
    phase velocity
    attenuation
    wavenumber
    dissipation
    Opis:
    The present paper is devoted to the study of phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic circular cylinders in the presence of dissipation. The explicit expressions for phase velocity and attenuation of longitudinal shear vibrations are derived. The frequency equation of longitudinal shear vibrations and modes obtained in a previous paper are used to compute the phase velocity and attenuation for different dissipations for thin and thick poroelastic cylindrical shells and poroelastic solid cylinder. The physical parameters of sandstone saturated with kerosene and sandstone saturated with water are used for the purpose of computation. It is found that the phase velocity is linear beyond certain frequency. Phase velocity is smaller for a typical anti-symmetric mode compared to the flexural mode. It is greater for the second mode than that of the first mode. Also the phase velocity is larger for a thin poroelastic cylindrical shell than that of a thick poroelastic cylindrical shell. The same is true for attenuation also. Attenuation is very high for the considered dissipations and it increases with the increase in dissipation.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 337-346
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability phase diagram of the Ir-Pt solid solution - numerical modelling from first principles
    Autorzy:
    Woźniakowski, A.
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333620.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    ab-initio phase diagram modelling
    Monte Carlo (MC) simulations
    density functional theory
    DFT
    obliczenia ab initio
    modelowanie diagramu fazowego
    symulacja Monte Carlo
    teoria funkcjonału gęstości
    Opis:
    First principles based numerical methods are used to determine the phase stability diagram of the Ir–Pt solid solution with A1-type crystal structure. Ising-like cluster expansion formalism was used to construct the lattice Hamiltonian. Phase diagram was calculated with the use of Monte Carlo simulations. Miscibility gap in this system was predicted. Calculated consolute temperature (TC) is about 1250 K at 50% of platinum when excess vibrational contribution to the free energy was included. The result is in good quantitative agreement with experimental data.
    Źródło:
    Journal of Medical Informatics & Technologies; 2013, 22; 265-269
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large population evolutionary games played within a life history framework
    Wieloosobowe gry ewolucyjne typu „cyklu życiowego”
    Autorzy:
    Ramsey, David
    Powiązania:
    https://bibliotekanauki.pl/articles/907464.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    evolutionary game theory
    game against the field
    phase
    evolutionarily stable strategy
    neighbourhood invasion strategy
    polymorphism
    gry ewolucyjne
    gry wieloosobowe
    faza strategia ewolucyjnie stabilna
    strategia lokalnie wypierająca
    polimorfizm
    Opis:
    In many evolutionary games, such as parental care games, the length of time spent playing a realisation of the game is dependent on the strategy of an individual. Also, the payoff of a deserting male cannot be defined in isolation from the strategies used in the population as a whole. Such games should be defined as games against the field (large population games) rather than two-player games. Several examples are presented to illustrate the theory of such games against the field.
    W dziedzinie gier ewolucyjnych zwykle zakłada się, że każda jednostka gra wiele razy w dany rodzaj gry dwuosobowej, z tym że za każdym razem jej przeciwnik zmienia się. W przypadku gier ewolucyjnych, takich jak „wojna na wyczerpanie” czy „opieka rodzicielska”, czas wykorzystany na realizację gry zależy od strategii wybranej przez jednostkę. W takich przypadkach należy brać pod uwagę nie tylko średnią wypłatę z każdej realizacji gry, ale też średni czas potrzebny na jej realizację. W tej sytuacji model standardowej gry dwuosobowej powinien być zastąpiony grą wieloosobową. Dodatkowo, w grach typu „opieka rodzicielska” wypłata samca, który nie opiekuje się swoimi dziećmi, zależy od możliwości uzyskania dodatkowych partnerek, co z kolei zależy od strategii używanych w całej populacji. W pracy rozważono kilka przykładów gier wieloosobowych, które są wygenerowane przez grę dwuosobową.
    Źródło:
    Operations Research and Decisions; 2009, 19, 2; 51-74
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Kummer confluent hypergeometric function and some of its applications in the theory of azimuthally magnetized circular ferrite waveguides
    Autorzy:
    Georgiev, G. N.
    Georgieva-Grosse, M. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/309046.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    microwave propagation in anisotropic media
    microwave guides and components
    ferrite phase shifters
    switches
    isolators
    eigenvalue problems
    function-theoretic and computational methods in electromagnetic theory
    theoretical and numerical analysis of special functions
    Opis:
    Examples of the application of the confluent hypergeometric functions in miscellaneous areas of the theoretical physics are presented. It is suggested these functions to be utilized as a universal means for solution of a large number of problems, leading to: cylindrical, incomplete gamma, Coulomb wave, Airy, Kelvin, Bateman, Weber's parabolic cylinder, logarithmic-integral and exponential integral functions, generalized Laguerre, Poisson-Charlier and Hermit polynomials, integral sine and cosine, Fresnel and probability integrals, etc. (whose complete list is given), which are their special cases. The employment of such an approach would permit to develop general methods for integration of these tasks, to generalize results of different directions of physics and to find the common features of various phenomena, governed by equations, pertaining to the same family. Emphasis is placed here on the use of the Kummer function in the field of microwaves: the cases of normal and slow rotationally symmetric TE modes propagation in the azimuthally magnetized circular ferrite waveguide are considered. Lemmas on the properties of the argument, real and imaginary parts, and positive purely imaginary (real) zeros of the function mentioned in the complex (real) domain, of importance in the solution of boundary-value problem stated for normal (slow) waves, are substantiated analytically or numerically. A theorem for the identity of positive purely imaginary and real zeros of the complex respectively real Kummer function for certain parameters, is proved numerically. Tables and graphs support the results established. The terms for wave transmission are obtained as four bilaterally open intervals of variation of the quantities, specifying the fields. It turns out that the normal (slow) modes may exist in one (two) region(s). The theoretically predicted phase curves for the first waves of the two TE sets examined show that the structure explored is suitable for ferrite control components design.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 3; 112-128
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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