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Relevant bibliographies by topics / SUPERFLUID MODEL

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Academic literature on the topic 'SUPERFLUID MODEL'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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Journal articles on the topic "SUPERFLUID MODEL"

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Kwon, W. J., G. Del Pace, R. Panza, M. Inguscio, W. Zwerger, M. Zaccanti, F. Scazza, and G. Roati. "Strongly correlated superfluid order parameters from dc Josephson supercurrents." Science 369, no. 6499 (July 2, 2020): 84–88. http://dx.doi.org/10.1126/science.aaz2463.

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The direct-current (dc) Josephson effect provides a phase-sensitive tool for investigating superfluid order parameters. We report on the observation of dc Josephson supercurrents in strongly interacting fermionic superfluids across a tunneling barrier in the absence of any applied potential difference. For sufficiently strong barriers, we observed a sinusoidal current-phase relation, in agreement with Josephson’s seminal prediction. We mapped out the zero-resistance state and its breakdown as a function of junction parameters, extracting the Josephson critical current behavior. By comparing our results with an analytic model, we determined the pair condensate fraction throughout the Bardeen-Cooper-Schrieffer–Bose-Einstein condensation crossover. Our work suggests that coherent Josephson transport may be used to pin down superfluid order parameters in diverse atomic systems, even in the presence of strong correlations.

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AGUIRRE, R. M. "NUCLEAR MATTER SUPERFLUIDITY IN AN EFFECTIVE HADRONIC FIELD MODEL WITH EXCLUDED VOLUME CORRECTIONS." International Journal of Modern Physics E 20, no. 09 (September 2011): 1967–82. http://dx.doi.org/10.1142/s0218301311019611.

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Properties of the 1S0 superfluid phase are studied for symmetric nuclear matter at finite temperature. It is described within a covariant hadronic field model, of the σ–ω type, with addition of density dependent correlations simulating effects due to finite extension of nucleons. The model is solved in a self-consistent Hartree–Bogoliubov approach, assuming instantaneous interactions in the superfluid phase. A comparison with the results obtained from several hadronic field models is made. Main characteristics of our description of the superfluid gap are in qualitative agreement with some studies using microscopic potentials, although further refinements could improve its performance.

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Saadat, H., and B. Pourhassan. "Holographic Superfluid and STU Model." International Journal of Theoretical Physics 52, no. 3 (November 11, 2012): 997–1006. http://dx.doi.org/10.1007/s10773-012-1412-3.

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OWCZAREK, ROBERT. "KNOTTED VORTICES AND SUPERFLUID PHASE TRANSITION." Modern Physics Letters B 07, no. 23 (October 10, 1993): 1523–26. http://dx.doi.org/10.1142/s0217984993001557.

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In this letter, studies of knotted vortex structures in superfluid helium are continued. A model of superfluid phase transition (λ-transition) is built in this framework. Similarities of this model to the two-dimensional Ising model are shown. Dependence of specific heat of superfluid helium on temperature near the λ point is explained.

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GU, SHI-JIAN, JUNPENG CAO, SHU CHEN, and HAI-QING LIN. "SCALING LAW OF SUPERFLUID–INSULATOR TRANSITION IN THE 1D BOSE–HUBBARD MODEL." International Journal of Modern Physics B 26, no. 04 (February 10, 2012): 1250014. http://dx.doi.org/10.1142/s0217979211102228.

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The finite size scaling behavior of superfluid–insulator transition in the one-dimensional Bose–Hubbard model is studied. It is shown that the superfluid density of the system with finite size has a maximum at a certain interaction Um and the derivative of superfluid density has a minimum at a certain interaction Ud. The critical point Uc can be quantified by the scaling analysis of either Um or Ud. The transition point Um tends to the critical point Uc from the region of U < Uc, while the Ud tends to the Uc from the region of U > Uc. The transition points Um and Ud satisfy different finite size scaling laws and have the different critical exponents. The divergence speed of the superfluid density is much smaller than that of its derivative at the critical point.

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Haskell, B., D. Antonopoulou, and C. Barenghi. "Turbulent, pinned superfluids in neutron stars and pulsar glitch recoveries." Monthly Notices of the Royal Astronomical Society 499, no. 1 (September 4, 2020): 161–70. http://dx.doi.org/10.1093/mnras/staa2678.

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ABSTRACT Pulsar glitches offer an insight into the dynamics of superfluids in the high-density interior of a neutron star. To model these phenomena, however, one needs to have an understanding of the dynamics of a turbulent array of superfluid vortices moving through a pinning lattice. In this paper, we develop a theoretical approach to describe vortex-mediated mutual friction in a pinned, turbulent and rotating superfluid. Our model is then applied to the study of the post-glitch rotational evolution in the Vela pulsar and in PSR J0537-6910. We show that in both cases a turbulent model fits the evolution of the spin frequency derivative better than a laminar one. We also predict that the second derivative of the frequency after a glitch should be correlated with the waiting time since the previous glitch, which we find to be consistent with observational data for these pulsars. The main conclusion of this paper is that in the post-glitch rotational evolution of these two pulsars we are most likely observing the response to the glitch of a pinned turbulent region of the star (possibly the crust) and not the laminar response of a regular straight vortex array.

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Ho, Wynn C. G., Cristóbal M. Espinoza, Danai Antonopoulou, and Nils Andersson. "Pinning down the superfluid and measuring masses using pulsar glitches." Science Advances 1, no. 9 (October 2015): e1500578. http://dx.doi.org/10.1126/sciadv.1500578.

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Pulsars are known for their superb timing precision, although glitches can interrupt the regular timing behavior when the stars are young. These glitches are thought to be caused by interactions between normal and superfluid matter in the crust of the star. However, glitching pulsars such as Vela have been shown to require a superfluid reservoir that greatly exceeds that available in the crust. We examine a model in which glitches tap the superfluid in the core. We test a variety of theoretical superfluid models against the most recent glitch data and find that only one model can successfully explain up to 45 years of observational data. We develop a new technique for combining radio and x-ray data to measure pulsar masses, thereby demonstrating how current and future telescopes can probe fundamental physics such as superfluidity near nuclear saturation.

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Rahmatinejad, A., R. Razavi, and L. Elahizadeh. "First-order phase transition in 97,98Mo isotopes." Modern Physics Letters A 36, no. 19 (June 21, 2021): 2150133. http://dx.doi.org/10.1142/s0217732321501339.

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Experimental evidences of a first-order phase transition from a superfluid to a non-interacting Fermi gas system are studied for [Formula: see text]Mo isotopes. The experimental observations are compared with the semi-empirical macroscopic model and superfluid formalism. We have shown that the entropy excess ratio introduced in our previous publications within the superfluid model can describe the first-order phase transition due to pair-breaking in atomic nuclei.

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Czart, W. R., M. Szkudlarek, and S. Robaszkiewicz. "Superfluid Characteristics of Induced-Pairing Model." Acta Physica Polonica A 91, no. 2 (February 1997): 415–18. http://dx.doi.org/10.12693/aphyspola.91.415.

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Ovchinnikov, M., and Alexey Novikov. "Microscopic computational model of a superfluid." Journal of Chemical Physics 132, no. 21 (June 7, 2010): 214101. http://dx.doi.org/10.1063/1.3424846.

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Dissertations / Theses on the topic "SUPERFLUID MODEL"

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Khan, K. B. "The nonlocal-nonlinear-Schroedinger-equation model of superfluid '4He." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267224.

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Laine, S. (Sami). "A simple model of superfluid ³He in nematically ordered aerogel." Master's thesis, University of Oulu, 2014. http://urn.fi/URN:NBN:fi:oulu-201406031624.

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Recent experiments have been made with helium-3 immersed in a new type of aerogel. This aerogel consists of aluminium oxide strands, which are directed along roughly the same direction at macroscopic length scale. In this thesis we propose a simple theoretical model of this so called nematically ordered aerogel, and study the model using the Ginzburg-Landau theory of superfluidity. Because of the complexity of the theory, it is necessary to rely on numerical methods. We use two different iterative methods, Newton’s method and Conjugate Gradient method, to numerically minimise the Ginzburg-Landau free energy. Numerical simulations show that there are three different stable superfluid phases, A-like phase, B-like phase and polar phase. We determine the symmetries of these phases, because the symmetries provide a way to classify different phases. We then present phase diagrams for the model with different boundary conditions and parameters. We also try adding randomness to the model. A notable result is that the normal-superfluid transition is always from the normal phase to the polar phase. A comparison between the experimental phase diagram and the theoretical phase diagrams shows that the model can explain the experiments qualitatively, but not quantitatively.

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Morgan, Samuel Alexander. "A gapless theory of Bose-Einstein condensation in dilute gases at finite temperature." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302178.

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Villois, Alberto. "Dynamics of quantized vortices and electron bubbles in the Gross-Pitaevskii model of a superfluid." Thesis, University of East Anglia, 2018. https://ueaeprints.uea.ac.uk/67849/.

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In this thesis we present an extensive study on quantised vortex dynamics using the Gross-Pitaevskii model of a superfluid in the limit of zero temperature. We make use of an accurate and robust numerical method that we developed to detect topological defects present in the scalar order parameter characterising the superfluid. We begin by focusing on the scattering of vortex rings by a superfluid line vortex. Thereafter, we focus on the development and decay of a turbulent vortex tangle, measuring the Vinen’s decay law for the total vortex length. Moreover, the temporal evolution of the Kelvin wave spectrum is obtained providing evidence of the development of a weak-wave turbulence cascade. The study of superfluid vortex reconnections is also carried out in order to identify what aspects of the reconnection process are universal. Aside from the investigation on quantised vortex dynamics, in this thesis we also present a study on the motion of an electron bubble in a superfluid. The electron bubble dynamics is studied in the adiabatic approximation using the Gross-Pitaevskii equation to model the superfluid wavefunction and a Schro ̈dinger equation to model the electron wavefunction. This model allows us to recover the key dynamics of the ion-vortex interactions that arise and the subsequent ion-vortex complexes that can form. We determine the vortex-nucleation limited mobility of the ion to recover values in reasonable agreement with measured data. Moreover, considering the scenario of an ion trapped on the core of a vortex line, we investigate how small and large amplitude Kelvin waves and solitary waves affect the drift velocity of the ion. In particular, we have identified that Hasimoto soliton-bubble complexes propagating along the vortex can arise.

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Rajaram, Sara. "Photon Counting as a Probe of Superfluidity in a Two-Band Bose Hubbard System Coupled to a Cavity Field." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354707647.

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Costa, Karine Piacentini Coelho da. "Estudo do modelo de Bose-Hubbard usando o algoritmo Worm." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-27022012-085711/.

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Nesta dissertação estudaremos sistemas de bósons ultrafrios armadilhados em uma rede ótica quadrada bidimensional sem levar em consideração o confinamento harmônico. A dinâmica desses sistemas é bem descrita pelo modelo de Bose-Hubbard, que prevê uma transição de fase quântica de um superfluido para um isolante de Mott a temperaturas baixas, e pode ser induzida variando a profundidade do potencial da rede ótica. Apresentaremos o diagrama de fases dessa transição construído a partir de uma aproximação de campo médio e também com um cálculo numérico usando um algoritmo de Monte Carlo Quântico, denominado algoritmo Worm. Encontramos o ponto crítico para o primeiro lobo de Mott em ambos os casos, concordando com trabalhos anteriores.
This work study the two-dimensional ultracold bosonic atoms loaded in a square optical lattice, without harmonic confinement. The dynamics of this system is described by the Bose-Hubbard model, which predicts a quantum phase transition from a superfluid to a Mott-insulator at low temperatures that can be induced by varying the depth of the optical potential. We present here the phase diagram of this transition built from a mean field approach and from a numerical calculation using a Quantum Monte Carlo algorithm, namely the Worm algorithm. We found the critical transition point for the first Mott lobe in both cases, in agreement with the standard literature.

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Duchon, Eric Nicholas. "Quantum Phase Transitions in the Bose Hubbard Model and in a Bose-Fermi Mixture." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386002245.

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Wang, Sui. "Two-dimensional models of particle motion in superfluid turbulence." Thesis, University of Newcastle Upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492944.

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Poujade, Mathieu. "Mouillage pseudo-partiel et modes propagatifs d'un ménisque d'hélium-4 superfluide." Paris 6, 2002. http://www.theses.fr/2002PA066502.

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Kuntz, Fabien. "Une approche basée modèle pour l’optimisation du monitoring de systèmes avioniques relativement à leurs performances de diagnostic." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14825/document.

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Les systèmes avioniques s'étoffent et se complexifient de plus en plus. Avec l'augmentation des capacités de calcul, de nouvelles architectures basées sur le partage de ressources émergent. Effectuer le diagnostic d'un système n'est désormais plus une opération anodine. L'enjeu actuel est donc de mettre en place des techniques de diagnostic performantes tout en optimisant les capacités de monitoring nécessaires.Ce mémoire donne une caractérisation basée modèle d'un système sous diagnostic, puis propose des techniques pour en évaluer les performances de diagnostic, ainsi que celles de son monitoring (relativement à ces performances). Le contexte industriel dans lequel s'inscrit cette thèse amène d'autres contraintes, notamment la prise en compte de la taille des systèmes avioniques à analyser. Cette thèse étudie alors l'applicabilité des techniques introduites dans ce contexte et en propose une adaptation
Avionics systems become more and more complex. With the improvment of computing possibilities, new architectures based on resources sharing are growing up. Perform diagnosis of a system is no longer a trivial operation. The challenge is to develop efficient techniques of diagnosis while optimizing capabilities of monitoring required.This thesis give a model-based characterization of a system under diagnosis, and proposes techniques to assess diagnostic performances, as well as its monitoring ones (with respect to these diagnostic performances). The industrial context of this thesis brings other constraints, and in particular the need to handle the size of avionics systems to analyze. That thesis then examines the applicability of the introduced techniques to this particular context, and proposes an adaptation

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Books on the topic "SUPERFLUID MODEL"

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Boldyreva, L. B. A model of superfluid physical vacuum. [Moskva]: Fond parapsikhologii im. L.L. Vasilʹeva, 1992.

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Kavokin, Alexey V., Jeremy J. Baumberg, Guillaume Malpuech, and Fabrice P. Laussy. Spin and polarisation. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198782995.003.0009.

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In this chapter we consider a complex set of optical phenomena linked to the spin dynamics of exciton-polaritons in semiconductor microcavities. We review a few important experiments that reveal the main mechanisms of the exciton-polariton spin dynamics and present the theoretical model of polariton spin relaxation based on the density matrix formalism. We also discuss the polarisation properties of the condensate and the superfluid phase transitions for polarised exciton-polaritons. We briefly address the polarization multistability and switching in polariton lasers. Finally, the optical spin-Hall and spin-Meissner effects are described.

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Horing, Norman J. Morgenstern. Superfluidity and Superconductivity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0013.

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Chapter 13 addresses Bose condensation in superfluids (and superconductors), which involves the field operator ψ‎ having a c-number component (<ψ(x,t)>≠0), challenging number conservation. The nonlinear Gross-Pitaevskii equation is derived for this condensate wave function<ψ>=ψ−ψ˜, facilitating identification of the coherence length and the core region of vortex motion. The noncondensate Green’s function G˜1(1,1′)=−i<(ψ˜(1)ψ˜+(1′))+> and the nonvanishing anomalous correlation function F˜∗(2,1′)=−i<(ψ˜+(2)ψ˜+(1′))+> describe the dynamics and elementary excitations of the non-condensate states and are discussed in conjunction with Landau’s criterion for viscosity. Associated concepts of off-diagonal long-range order and the interpretation of <ψ> as a superfluid order parameter are also introduced. Anderson’s Bose-condensed state, as a phase-coherent wave packet superposition of number states, resolves issues of number conservation. Superconductivity involves bound Cooper pairs of electrons capable of Bose condensation and superfluid behavior. Correspondingly, the two-particle Green’s function has a term involving a product of anomalous bound-Cooper-pair condensate wave functions of the type F(1,2)=−i<(ψ(1)ψ(2))+>≠0, such that G2(1,2;1′,2′)=F(1,2)F+(1′,2′)+G˜2(1,2;1′,2′). Here, G˜2 describes the dynamics/excitations of the non-superfluid-condensate states, while nonvanishing F,F+ represent a phase-coherent wave packet superposition of Cooper-pair number states and off-diagonal long range order. Employing this form of G2 in the G1-equation couples the condensed state with the non-condensate excitations. Taken jointly with the dynamical equation for F(1,2), this leads to the Gorkov equations, encompassing the Bardeen–Cooper–Schrieffer (BCS) energy gap, critical temperature, and Bogoliubov-de Gennes eigenfunction Bogoliubons. Superconductor thermodynamics and critical magnetic field are discussed. For a weak magnetic field, the Gorkov-equations lead to Ginzburg–Landau theory and a nonlinear Schrödinger-like equation for the pair wave function and the associated supercurrent, along with identification of the Cooper pair density. Furthermore, Chapter 13 addresses the apparent lack of gauge invariance of London theory with an elegant variational analysis involving re-gauging the potentials, yielding a manifestly gauge invariant generalization of the London equation. Consistency with the equation of continuity implies the existence of Anderson’s acoustic normal mode, which is supplanted by the plasmon for Coulomb interaction. Type II superconductors and the penetration (and interaction) of quantized magnetic flux lines are also discussed. Finally, Chapter 13 addresses Josephson tunneling between superconductors.

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Bueno, Otávio, and Steven French. Representing Physical Phenomena. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198815044.003.0005.

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This chapter extends the case study on quantum mechanics to include not only the ‘top-down’ application of group theory to quantum physics but also the ‘bottom-up’ construction of models of the phenomena, with the example of London’s explanation of the superfluid behaviour of liquid helium in terms of Bose–Einstein statistics. We claim that in moving from top to bottom, from the mathematics to what is observed in the laboratory, the models involved and the relations between them can again be accommodated by the partial structures approach, coupled with an appreciation of the heuristic moves involved in scientific work. Furthermore, as in the previous examples, this case fits with our inferential account of the application of mathematics, whereby immersion of the phenomena into the relevant mathematics allows for the drawing down of structure and the derivation of certain results that can then be interpreted at the phenomenological level.

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Davis, Darrell W. Ozu, the Ineffable. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190254971.003.0003.

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This chapter addresses the conceit of Ozu’s Zen Buddhist underpinnings, especially the impression his films leave on Western critics. Paul Schrader’s “transcendental” account of Ozu kicked off a cycle of mystical Oriental tropics in the 1970s. Because the Western discovery of Ozu’s films centered on the stately postwar masterpieces, Ozu’s early comedies and genre pictures were neglected; they did not feed into the model of ineffable otherness. Japanese critics have had little patience with this approach and have provided rich rebuttals, particularly Hasumi Shigehiko and Yoshida Kiju. Hasumi is intent on breaking the conflation of Ozu’s ascetic style with negative or abstemious nuances. In Ozu, Yoshida sees a cinema of restored superfluity, a presignifying world, with things seeming to look back at viewers. Bordwell, Thompson, Burch, and Richie have all rounded out Ozu’s reputation, sometimes picking up Zen cues but also broadening the oeuvre.

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Horing, Norman J. Morgenstern. Quantum Statistical Field Theory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.001.0001.

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The methods of coupled quantum field theory, which had great initial success in relativistic elementary particle physics and have subsequently played a major role in the extensive development of non-relativistic quantum many-particle theory and condensed matter physics, are at the core of this book. As an introduction to the subject, this presentation is intended to facilitate delivery of the material in an easily digestible form to students at a relatively early stage of their scientific development, specifically advanced undergraduates (rather than second or third year graduate students), who are mathematically strong physics majors. The mechanism to accomplish this is the early introduction of variational calculus with particle sources and the Schwinger Action Principle, accompanied by Green’s functions, and, in addition, a brief derivation of quantum mechanical ensemble theory introducing statistical thermodynamics. Important achievements of the theory in condensed matter and quantum statistical physics are reviewed in detail to help develop research capability. These include the derivation of coupled field Green’s function equations of motion for a model electron-hole-phonon system, extensive discussions of retarded, thermodynamic and non-equilibrium Green’s functions, and their associated spectral representations and approximation procedures. Phenomenology emerging in these discussions includes quantum plasma dynamic, nonlocal screening, plasmons, polaritons, linear electromagnetic response, excitons, polarons, phonons, magnetic Landau quantization, van der Waals interactions, chemisorption, etc. Considerable attention is also given to low-dimensional and nanostructured systems, including quantum wells, wires, dots and superlattices, as well as materials having exceptional conduction properties such as superconductors, superfluids and graphene.

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Book chapters on the topic "SUPERFLUID MODEL"

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Bézaguet, A., J. Casas-Cubillos, Ph Lebrun, M. Marquet, L. Tavian, and R. Weelderen. "The Superfluid Helium Model Cryoloop for the CERN Large Hadron Collider (LHC)." In Advances in Cryogenic Engineering, 649–56. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_79.

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Carter, Brandon. "Relativistic Superfluid Models for Rotating Neutron Stars." In Lecture Notes in Physics, 54–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44578-1_3.

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Schmiedmayer, Jörg. "One-Dimensional Atomic Superfluids as a Model System for Quantum Thermodynamics." In Fundamental Theories of Physics, 823–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99046-0_34.

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"LATTICE MODEL OF THE SUPERFLUID PHASE TRANSITION." In Gauge Fields in Condensed Matter, 346–408. WORLD SCIENTIFIC, 1989. http://dx.doi.org/10.1142/9789814415606_0011.

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Zinn-Justin, Jean. "The weakly interacting Bose gas at the critical temperature." In From Random Walks to Random Matrices, 361–72. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198787754.003.0020.

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Chapter 20 examines effects of weak repulsive interactions in a Bose–Einstein condensate and the transition from Bose–Einstein condensate to superfluid phase transition. Renormalization group methods are used and a universal amplitude is calculated by non–perturbative methods. After the discovery of the predicted Bose–Einstein condensation, which is a property of free bosons, an interesting issue was the effects of weak repulsive interactions. In this chapter, it is shown that, near the transition temperature, the initial non–relativistic field theory can be replaced by a relativistic effective Euclidean field theory known to describe a superfluid phase transition (a dimensional reduction). These theoretical considerations are illustrated by an evaluation of the universal variation of the transition temperature at weak coupling. For this purpose, the O(2) symmetry of the model is generalized to O(N) symmetry, and large N techniques are used.

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Devreese, J. T., F. Brosens, and L. F. Lemmens. "Derivation of a polaron-type model for a 3He atom moving in superfluid 4He." In Theories of Matter, 267–72. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789814354103_0017.

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Jou, D., M. S. Mongiov, M. Sciacca, L. Ardizzone, and G. Gaet. "Hydrodynamical Models of Superfluid Turbulence." In Thermodynamics. InTech, 2011. http://dx.doi.org/10.5772/13402.

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"The Model of 3He." In Collective Excitations in Unconventional Superconductors and Superfluids, 83–101. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789812771247_0005.

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"Stability of Goldstone–Modes." In Collective Excitations in Unconventional Superconductors and Superfluids, 217–39. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789812771247_0009.

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HALPERIN, W. P., and E. VAROQUAUX. "Order-Parameter Collective Modes in Superfluid 3He." In Helium Three, 353–522. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-444-87476-4.50013-3.

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Conference papers on the topic "SUPERFLUID MODEL"

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Domenikos, G. R., P. Bitsikas, and E. Rogdakis. "Thermodynamic Modelling of Superfluid Stirling Cryocoolers." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10077.

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Abstract The aim of this paper is to describe and thermodynamically model cryogenic Stirling refrigerators, using Helium in its different forms as the working medium. Helium has unique properties at cryogenic temperatures forming a superfluid. The cryogenic Stirling refrigerators with Helium at such low temperatures make use of the properties of this superfluid nature of Helium, thus they are referred to as Superfluid Stirling Refrigerators (SSR). To make use of these remarkable properties of superfluid helium a different version of Stirling refrigerator is used where superleaks are introduced in the pistons in order to let the superfluid part flow freely but constrain the normal fluid. This cooling procedure has an upper temperature limit as it is based on the superfluidity of helium, hence all the workings of this cycle must be well below the Lambda line. In addition, different models are needed and are used for the different isotopes of helium as their atomic spin nature is different and therefore their behavior at temperatures near absolute zero. In this study of SSR cryocoolers great care is being given towards the thermodynamic behavior of the entire system and working media, as well as different designs of the apparatus.

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Micnas, R. "Superfluid properties of the Boson-Fermion model." In HIGHLIGHTS IN CONDENSED MATTER PHYSICS. AIP, 2003. http://dx.doi.org/10.1063/1.1639592.

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MONGIOVI', M. S., and D. JOU. "A THERMODYNAMICAL MODEL OF INHOMOGENEOUS SUPERFLUID TURBULENCE." In Selected Contributions from the 8th SIMAI Conference. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812709394_0040.

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Devasia, Santosh. "Rapid Information Transfer in Swarms Under Update-Rate-Bounds Using Delayed Self Reinforcement." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9001.

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Abstract:

The effectiveness of a network’s response to external stimuli depends on rapid distortion-free information transfer across the network. However, the rate of information transfer, when each agent aligns with information from its network neighbors, is limited by the update rate at which each individual can sense and process information. Moreover, such neighbor-based, diffusion-type information transfer does not predict the superfluid-like information transfer during swarming maneuvers observed in nature. The main contribution of this article is to propose a novel model that uses self reinforcement, where each individual augments its neighbor-averaged information update using its previous update, to (i) increase the information-transfer rate without requiring an increased, individual update-rate; and (ii) enable superfluid-like information transfer. Simulations results of example systems show substantial improvement, more than an order of magnitude increase, in the information transfer rate, without the need to increase the update rate. Moreover, results show that the DSR approach’s ability to enable superfluid-like, distortion-free information transfer results in maneuvers with smaller turn radius and improved cohesiveness.

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Isojärvi, Teemu, Lauri Lehtovaara, and Jussi Eloranta. "Applicability of Density Functional Theory to Model Molecular Solvation in Superfluid 4He." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354749.

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Hänninen, R., A. Mitani, and M. Tsubota. "Simple Pinning Model for Vibrating Wire Turbulence in Superfluid Helium at Zero Temperature." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354672.

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Miller, Franklin, and Amir Jahromi. "Development of a Numerical Model of a Superfluid Magnetic Pump for Space Science Applications." In 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-809.

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Zakrzewski, Jakub, Dominique Delande, Marko Robnik, and Valery Romanovski. "Accurate determination of the superfluid-insulator transition in the one-dimensional Bose-Hubbard model." In LET’S FACE CHAOS THROUGH NONLINEAR DYNAMICS: Proceedings of “Let’s Face Chaos Through Nonlinear Dynamics” 7th International Summer School and Conference. AIP, 2008. http://dx.doi.org/10.1063/1.3046265.

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Rafal Noga, Toshiyuki Ohtsuka, Cesar de Prada Moraga, Enrique Blanco Vinuela, and Juan Casas Cubillos. "Nonlinear Model Predictive Control for the Superfluid Helium Cryogenic Circuit of the Large Hadron Collider." In Control (MSC). IEEE, 2010. http://dx.doi.org/10.1109/cca.2010.5611105.

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Minoguchi, Tomoki. "Effective Free Energy for Solidification of Superfluid He-4 under Pressure: An Improvement of Previous Model." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354732.

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