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Letteratura scientifica selezionata sul tema "Skyrme functionals"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Skyrme functionals"

Selva, Giovanni, Xavier Roca-Maza e Gianluca Colò. "Isospin Symmetry Breaking Effects on the Mass-Radius Relation of a Neutron Star". Symmetry 13, n. 1 (16 gennaio 2021): 144. http://dx.doi.org/10.3390/sym13010144.

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Isospin symmetry breaking effects on the mass-radius relation of a cold, non-accreting neutron star are studied on the basis of two Skyrme Energy Density Functionals (EDFs). One functional contains isospin symmetry breaking terms other than those typically included in Skyrme EDFs while its counterpart is of standard form. Both functionals are based on the same fitting protocol except for the observables and pseudo-observables sensitive to the isospin symmetry breaking channel. The quality of those functionals is similar in the description of terrestrial observables but choosing either of them has a non-negligible effect on the mass-radius relation and tidal deformability of a neutron star. Further investigations are needed to clarify the effects of isospin symmetry breaking on these and other observables of neutron stars that are, and will become, available.

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KOSHKIN, SERGIY. "GAUGE THEORY OF FADDEEV–SKYRME FUNCTIONALS". Communications in Contemporary Mathematics 12, n. 05 (ottobre 2010): 871–908. http://dx.doi.org/10.1142/s0219199710004020.

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We study geometric variational problems for a class of nonlinear σ-models in quantum field theory. Mathematically, one needs to minimize an energy functional on homotopy classes of maps from closed 3-manifolds into compact homogeneous spaces G/H. The minimizers are known as Hopfions and exhibit localized knot-like structure. Our main results include proving existence of Hopfions as finite energy Sobolev maps in each (generalized) homotopy class when the target space is a symmetric space. For more general spaces, we obtain a weaker result on existence of minimizers in each 2-homotopy class.Our approach is based on representing maps into G/H by equivalence classes of flat connections. The equivalence is given by gauge symmetry on pullbacks of G → G/H bundles. We work out a gauge calculus for connections under this symmetry, and use it to eliminate non-compactness from the minimization problem by fixing the gauge.

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Pastore, A., D. Davesne, K. Bennaceur, J. Meyer e V. Hellemans. "Fitting Skyrme functionals using linear response theory". Physica Scripta T154 (1 maggio 2013): 014014. http://dx.doi.org/10.1088/0031-8949/2013/t154/014014.

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Pudliner, B. S., A. Smerzi, J. Carlson, V. R. Pandharipande, Steven C. Pieper e D. G. Ravenhall. "Neutron Drops and Skyrme Energy-Density Functionals". Physical Review Letters 76, n. 14 (1 aprile 1996): 2416–19. http://dx.doi.org/10.1103/physrevlett.76.2416.

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PAAR, N., T. MARKETIN, D. VRETENAR, Y. F. NIU, G. COLÒ, E. KHAN e J. MENG. "NUCLEAR EXCITATIONS AND WEAK INTERACTION RATES AT FINITE TEMPERATURE". Modern Physics Letters A 25, n. 21n23 (30 luglio 2010): 1767–70. http://dx.doi.org/10.1142/s0217732310000289.

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Self-consistent theory frameworks have been introduced for description of excitations in nuclei at finite temperature, based on energy density functionals formulated using i) relativistic mean field Lagrangian with density dependent meson-nucleon vertex functions, and ii) Skyrme-type functionals. Finite temperature random phase approximation (FTRPA) has been employed in description of multipole excitations and charge-exchange modes. It is shown that in the temperature range T = 1–2 MeV additional transition strength appears at low energies due to thermal unblocking of single-particle orbitals close to the Fermi level. Within the finite temperature Hartree-Fock+RPA based on Skyrme functionals, the electron capture cross sections have been studied for target nuclei at temperatures relevant in modeling the supernova evolution.

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COLÒ, G. "THE SYMMETRY ENERGY AND OTHER OPEN QUESTIONS CONCERNING EFFECTIVE FUNCTIONALS". International Journal of Modern Physics E 18, n. 04 (aprile 2009): 1008–13. http://dx.doi.org/10.1142/s0218301309013166.

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The nuclear structure community is striving to determine a nuclear energy functional which is as universal and as accurate as possible. When a functional is determined by fitting free parameters, the constraints on these parameters coming from excited states (like the well-known giant resonances) are not, as a rule, imposed. This work shows that at least three constraints could be imposed on Skyrme functionals, by explaining the physical background and discussing their relevance.

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BALLY, B., B. AVEZ, M. BENDER e P. H. HEENEN. "SYMMETRY RESTORATION FOR ODD-MASS NUCLEI WITH A SKYRME ENERGY DENSITY FUNCTIONAL". International Journal of Modern Physics E 21, n. 05 (maggio 2012): 1250026. http://dx.doi.org/10.1142/s0218301312500267.

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In these proceedings, we report first results for particle-number and angular-momentum projection of self-consistently blocked triaxial one-quasiparticle HFB states for the description of odd-A nuclei in the context of regularized multi-reference energy density functionals, using the entire model space of occupied single-particle states. The SIII parametrization of the Skyrme energy functional and a volume-type pairing interaction are used.

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Brenna, Marco, Gianluca Colò e Pier Francesco Bortignon. "Gamma decay of giant resonances by using Skyrme functionals". Journal of Physics: Conference Series 336 (28 dicembre 2011): 012010. http://dx.doi.org/10.1088/1742-6596/336/1/012010.

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Slobodeanu, R. "ON A STABILITY PROPERTY OF SKYRME-RELATED ENERGY FUNCTIONALS". Quarterly Journal of Mathematics 66, n. 1 (25 settembre 2014): 285–94. http://dx.doi.org/10.1093/qmath/hau024.

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Yakhshiev, Ulugbek. "From nucleons to nuclei (chiral soliton approach)". International Journal of Modern Physics: Conference Series 49 (gennaio 2019): 1960007. http://dx.doi.org/10.1142/s2010194519600073.

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We discuss the properties of nucleons in nuclear matter and the properties of nucleonic systems in the framework of an in-medium modified Skyrme Lagrangian. The modification is achieved by introducing the medium functionals into the original Skyrme Model Lagrangian in free space[Formula: see text]. The parameters of the medium functionals are related to the low density phenomenology (i.e. to the pionic atoms3) from the one side and to the properties of nuclear matter at the saturation density [Formula: see text] from the other side. After fitting the parameters of the model, the extrapolations into the low density and high density regions showed that the model can successfully describe the Equations of State (EoS) of nuclear matter in the wide range of densities including the high critical densities existing in the interiors of neutron stars.

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Più fonti

Tesi sul tema "Skyrme functionals"

Duan, Mingya. "Study of neutron-star and supernova matter with Skyrme functionals : response functions and new parametrizations". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP171.

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Les étoiles à neutrons sont des objets denses qui sont produits dans des explosions de supernova à effondrement de coeur. Pour la modélisation de la supernova et du refroidissement de l'étoile à neutrons, les taux d'absorption, d'émission et de diffusion des neutrinos jouent un rôle crucial. Dans une grande partie de ces systèmes astrophysiques, les noyaux sont complètement dissous. Dans ce cas, les taux de neutrinos peuvent être directement liés aux fonctions de réponse de la matière nucléaire, calculées aux densités, asymétries et températures correspondantes. Cette thèse développe d'abord le modèle de l'approximation des phases aléatoires (RPA) pour les fonctions de réponse avec les interactions effectives de Skyrme dans la matière nucléaire asymétrique pour des transferts d'énergie finis, et établit un lien entre le taux de diffusion des neutrinos et les fonctions de réponse. Ensuite, la dépendance en énergie et angle des taux de diffusion des neutrinos dans la matière de proto-étoile à neutrons et de supernova sont étudiés dans le cadre du modèle Skyrme-RPA. De nombreuses interactions antérieures de Skyrme prédisent que la vitesse de Fermi des neutrons dépasse la vitesse de la lumière à des densités que les étoiles à neutrons peuvent atteindre. Pour résoudre ce problème et poursuivre le calcul des taux de neutrinos pour les simulations astrophysiques à des densités élevées à l'aide de la théorie fonctionnelle de Skyrme, nous explorons ensuite la construction de nouvelles fonctionnelles de Skyrme. Les paramétrisations Sky1 et Sky2 sont obtenues en incluant des contraintes provenant de calculs microscopiques de la masse effective en plus des énergies de liaison et des rayons de charge de noyaux finis et de différentes équations d'état microscopiques de la matière de neutrons. Pour vérifier si les nouvelles paramétrisations conviennent à la description des noyaux finis et de la matière des étoiles à neutrons, nous calculons les propriétés des noyaux finis et de la matière nucléaire infinie, y compris la matière des étoiles à neutrons, et les présentons dans cette thèse. De plus, nous considérons l'interaction de Skyrme comme une fonctionnelle de la densité plutôt qu'une force à deux corps dépendant de la densité, afin d'explorer la détermination des termes dépendant du spin des nouvelles fonctionnelles de Skyrme. Les paramètres des termes dépendant du spin sont déterminés en ajustant les paramètres de Landau G_0 et G’_0 dans la matière de neutrons et dans la matière nucléaire symétrique aux résultats de la théorie microscopique de Brueckner-Hartree-Fock. Enfin, nous développons un protocole d'ajustement amélioré pour les nouvelles forces de Skyrme en ajoutant d'autres contraintes, telles que l'équation d'état de la matière nucléaire symétrique à haute densité, l'apparition d'instabilités non-physiques dans le canal de spin-0, et la différence entre les masses effectives des nucléons de spin up et de spin down dans la matière polarisée, afin d'obtenir de meilleures nouvelles fonctionnelles, Sky3s et Sky4s. Les fonctions de réponse et les taux de diffusion des neutrinos de la matière d'étoile à neutrons peuvent être calculés avec les nouvelles fonctionnelles ayant des masses effectives et paramètres de Landau réalistes
Neutron stars are dense objects that are produced in core collapse supernova explosions. For the modeling of the supernova and of the subsequent cooling of the neutron star, neutrino absorption, emission, and scattering rates play a crucial role. In a large part of these astrophysical systems, nuclei are completely dissolved. Then the neutrino rates can be directly related to the response functions of nuclear matter, computed at the relevant density, asymmetry, and temperature. This thesis develops first the random-phase approximation (RPA) model for the response functions with Skyrme effective interactions in asymmetric nuclear matter and finite energy transfer, and relates the neutrino scattering rate to the response functions. Then, the energy and angle dependence of neutrino scattering rates in proto-neutron star and supernova matter within Skyrme RPA are studied. Many previous Skyrme interactions predict that neutron Fermi velocity exceeds the speed of light at densities that neutron stars can reach. To solve this problem and continue the computation of neutrino rates for astrophysical simulations at high densities using Skyrme functional theory, we then explore the construction of the new Skyrme functionals. Sky1 and Sky2 are obtained by including constraints from microscopic calculations of the effective mass in addition to binding energies and charge radii of finite nuclei and different microscopic equations of state of pure neutron matter. To test whether they are suitable for describing finite nuclei and neutron star matter, we compute properties of finite nuclei and infinite nuclear matter, including neutron star matter, and present them in this thesis. Also, we consider the Skyrme interaction as a density-functional rather than a density-dependent two-body force to explore the determination of the spin-dependent terms of the new Skyrme functionals. The parameters of the spin-dependent terms are determined by fitting the Landau parameters G_0 and G’_0 in neutron matter and symmetric nuclear matter to the results of the microscopic Brueckner-Hartree-Fock theory. Finally, we develop the improved fitting protocol for the new Skyrme forces by adding other constraints, such as the equation of state of symmetric nuclear matter at high density, the onset of the spurious instability in the spin-0 channel, the splitting between the spin up and down nucleon effective masses in the polarized matter, obtaining better new functionals, Sky3s and Sky4s. The response functions and neutrino scattering rates of neutron-star matter can be computed with the new functionals having realistic effective masses and Landau parameters

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Bhattacharyya, Anirban. "Application of effective field theory to density functional theory for finite systems". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124116299.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xv, 210 p.; also includes graphics (some col.). Includes bibliographical references (p. 205-210). Available online via OhioLINK's ETD Center

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Sadoudi, Jeremy. "Constraints on the nuclear energy density functional and new possible analytical forms". Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112151/document.

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La méthode dite de la fonctionnelle de la densité d'énergie (EDF) est l'outil théorique de référence pour l'étude systématique de la structure des noyaux atomiques de masse A>20. La méthode EDF est formulée en deux étapes successives consistant à briser puis à restaurer les symétries du Hamiltonien nucléaire sous-jacent. La technique de restauration des symétries n'est cependant rigoureusement formulée que si la fonctionnelle d'énergie dérive explicitement d'une interaction effective, i.e. d'un pseudo-potentiel, ce qui constitue un cas particulier de la méthode EDF plus générale. Ainsi, et comme cela a été démontré récemment, l'utilisation des paramétrisations existantes des fonctionnelles d'énergie conduit à l'obtention de résultats non physiques. Le pouvoir prédictif limité des fonctionnelles d'énergie existantes et leur inocuité relative à la restauration des symétries, nécessitent aujourd'hui de repenser leur méthode de construction. La première partie de ce travail a été dédié à l'analyse approfondie du problème associé à la restauration de symétrie et à l'identification de pistes permettant de contraindre la forme analytique des fonctionnelles d'énergie ne dérivant pas d'un pseudo-potentiel indépendant du système. La seconde partie a consisté à développer un pseudo-potentiel rendant la restauration des symétries automatiquement bien définie. Les difficultés de ce travail ont résidé dans (i) l'identification de la complexité minimale du pseudo-potentiel nécessaire à l'obtention d'une fonctionnelle d'énergie assez flexible pour égaler, et si possible améliorer, les performances des paramétrisations existantes, (ii) la dérivation analytique de la fonctionnelle et des champs à un corps découlant de celle ci, (iii) l'implémentation de ces derniers dans les codes de calculs, et dans (iv) le développement d'un protocole d'ajustement des paramètres adapté à la nouvelle fonctionnelle d'énergie ainsi développée. Les premiers résultats obtenus ont permis de valider l'approche en démontrant la flexibilité suffisante du pseudo-potentiel au niveau des calculs réalisés sans restauration des symétries
The theoretical tool of choice for the microscopic description of all medium- and heavy-mass nuclei is the Energy Density Functional (EDF) method. Such a method relies on the concept of spontaneous symmetry breaking and restoration. In that sense, it is intrinsically a two-step approach. However, the symmetry restoration procedure is only well-defined in the particular case where the energy functional derives from a pseudo-potential. Thereby and as it has been recently shown, existing parameterizations of the energy functional provides unphysical results. Such a problem as well as the lack of predictive power call for developing new families of functionals. The first part of the present work is devoted to a study of the symmetry restoration problem and to the identification of properties that could constrain the analytic form of energy functionals that do not derive from a pseudo-potential. The second part deals with the construction of an energy functional that derives from a pseudo potential. The difficulties of such work are (i) the identification of the minimal complexity of the pseudo-potential necessary to obtain an energy functional that is flexible enough to provide high-quality EDF parameterizations, (ii) the tedious analytical derivation of the functional and of the associated one-body fields, (iii) the implementation of the latter in existing codes, and (iv) the development of an efficient fitting procedure. Eventually, it seems possible to generate a parameterization that strictly derives from a pseudo-potential and that provides as good results as state-of-the-art (quasi) bilinear functionals

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Sadoudi, Jérémy. "Constraints on the nuclear energy density functional and new possible analytical forms". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00653740.

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The theoretical tool of choice for the microscopic description of all medium- and heavy-mass nuclei is the Energy Density Functional (EDF) method. Such a method relies on the concept of spontaneous symmetry breaking and restoration. In that sense, it is intrinsically a two-step approach. However, the symmetry restoration procedure is only well-defined in the particular case where the energy functional derives from a pseudo-potential. Thereby and as it has been recently shown, existing parameterizations of the energy functional provides unphysical results. Such a problem as well as the lack of predictive power call for developing new families of functionals. The first part of the present work is devoted to a study of the symmetry restoration problem and to the identification of properties that could constrain the analytic form of energy functionals that do not derive from a pseudo-potential. The second part deals with the construction of an energy functional that derives from a pseudo potential. The difficulties of such work are (i) the identification of the minimal complexity of the pseudo-potential necessary to obtain an energy functional that is flexible enough to provide high-quality EDF parameterizations, (ii) the tedious analytical derivation of the functional and of the associated one-body fields, (iii) the implementation of the latter in existing codes, and (iv) the development of an efficient fitting procedure. Eventually, it seems possible to generate a parameterization that strictly derives from a pseudo-potential and that provides as good results as state-of-the-art (quasi) bilinear functionals.

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Becker, Pierre. "Développement d'une interaction nucléaire effective de nouvelle génération". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1153/document.

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Si le noyau atomique peut sembler aujourd'hui un système bien connu, sa description microscopique théorique comporte toujours des lacunes : décrire la structure nucléaire des noyaux tout le long de la charte des noyaux de manière satisfaisante par une seule interaction s'avère encore compliqué aujourd'hui.Les interactions les plus performantes et les plus utilisées pour atteindre ce but sont les interactions effectives. On peut généralement classer celles-ci en deux catégories: celles de portée finie et celles de portée nulle. L'interaction de Skyrme, dont il est principalement question dans ce manuscrit, appartient à la deuxième catégorie. Apparue dans les années 50 comme un développement en gradients à l'ordre 2, sa simplicité en a longtemps fait une interaction de choix. Une collaboration internationale, UNEDF, a toutefois montré que l'interaction en l'état était trop limitée pour reproduire correctement les données expérimentales actuelles et qu'il était nécessaire d'y trouver des extensions. Ce manuscrit propose une telle extension, décrivant le processus aboutissant à l'utilisation d'un développement en gradients jusqu'à l'ordre 6.Après avoir présenté les principales forces effectives utilisées dans le cadre de la structure nucléaire, nous montrerons le comportement de cette nouvelle interaction dans le modèle idéal de la matière infinie et son application dans la description des étoiles à neutrons. Nous verrons ainsi que les performances de notre interaction se sont avérées prometteuses. La comparaison des mêmes propriétés pour des potentiels de portée finie a validé ce constat. Notre extension à l'interaction de Skyrme offre à minima des performances comparables dans ce modèle.En conséquence, nous détaillerons également dans la suite du manuscrit la manière dont nous avons poursuivi le développement de notre nouvelle interaction en l'adaptant pour la description de noyaux sphériques. La dernière partie présente le processus d'ajustement de notre interaction, visant à une description des noyaux le long de la charte nucléaire. Une paramétrisation issue d'un tel ajustement sera enfin proposée
The nucleus may seem well known, but its microscopic description still isn't perfect. Describing accurately the nuclei along the nuclear chart remain complicated.Nowadays, the effective interactions are the best choice to achieve such a goal, and can be sorted in two categories: finite-range and zero-range. Skyrme interaction, the main subject of this report, belongs to the latter. Used since the 50s because of its simplicity, it is an expansion of gradients up to the 2th order. However, an international collaboration, UNEDF, showed recently that this interaction was too limited to describe all the nuclear constraints given by experimental datas. The conclusion was the necessity of Skyrme interaction extensions.This thesis is describing the process from the design of the interaction to its use in nuclei and in fitting procedures.First, we review the requirements and the construction of a general nuclear interactions, and the main interactions used in nuclear structure, both finite and zero range.We then show the behaviour of these interactions in a perfect model: the infinite nuclear matter. This is considered a preliminary test for every interaction aiming to describe nuclei, and the performances of our interactions are discussed, along the performances of the other models.The last part of the thesis is the adaptation of our extension for calculations of nuclei. Furthermore, the fitting procedure of our extended Skyrme interaction on both infinite nuclear matter and nuclei quantities is detailed. A resulting parametrisation is presented at the end of the thesis, aiming to describe more accurately the nuclear chart and the additional physic provided by the new terms

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Moghrabi, Kassem. "Beyond-mean-field corrections and effective interactions in the nuclear many-body problem". Phd thesis, Paris 11, 2013. http://tel.archives-ouvertes.fr/tel-00908607.

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Mean-field approaches successfully reproduce nuclear bulk properties like masses and radii within the Energy Density Functional (EDF) framework. However, complex correlations are missing in mean-field models and several observables related to single-particle and collective nuclear properties cannot be predicted accurately. The necessity to provide a precise description of the available data as well as reliable predictions in the exotic regions of the nuclear chart motivates the use of more sophisticated beyond-mean-field models. Correlations and higher-order corrections (beyond the leading mean-field order) are introduced. A crucial aspect in these calculations is the choice of the effective interaction to be used when one goes beyond the leading order (available effective interactions are commonly adjusted at the mean-field level). In the first part, we deal with the equation of state of nuclear matter evaluated up to the second order with the phenomenological Skyrme force. We analyze the ultraviolet divergence that is related to the zero range of the interaction and we introduce Skyrme-type regularized interactions that can be used at second order for matter. Cutoff regularization and dimen- sional regularization techniques are explored and applied. In the latter case, connections are naturally established between the EDF framework and some techniques employed in Effective Field Theories. In the second part, we check whether the regularized interactions introduced for nuclear matter can be employed also for finite nuclei. As an illustration, this analysis is performed within the particle- vibration model that represents an example of beyond mean-field models where an ultraviolet divergence appears if zero-range forces are used. These first applications suggest several directions to be explored to finally provide regularized interactions that are specially tailored for beyond- mean-field calculations for finite nuclei. Conclusions and perspectives are finally illustrated.

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Repko, Anton. "Gigantické rezonance v atomových jádrech". Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-300468.

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Skyrme functional is commonly used for the description of ground-state and dynamical properties of atomic nuclei. To describe the dynamical properties in the microscopic self-consistent way, we employed Separable Random Phase Approximation (SRPA) based on Skyrme functional. This work describes theory of Skyrme Hartree-Fock and SRPA and presents numerical calculation of E1 and M1 giant resonances in spherical nuclei Ca-40 - Fe-56. There is some evidence for non-zero ground-state deformation of the nucleus Fe-56, so it is treated also with such assumption. The results obtained for various parametrizations are compared to the experimental data.

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Repko, Anton. "Teoretický popis kolektivních excitací jader". Doctoral thesis, 2016. http://www.nusl.cz/ntk/nusl-347499.

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Density functional theory is a preferred microscopic method for calculation of nuclear properties over the whole nuclear chart. Besides ground-state properties, which are calculated by Hartree-Fock theory, nuclear excitations can be described by means of Random Phase Approximation (RPA). The main objective of the present work is to give the RPA formalism for spherically symmetric nuclei, using the techniques of angular-momentum coupling. Various auxiliary topics, such as Hartree-Fock theory, Coulomb integral, center-of-mass corrections and pairing, are treated as well. RPA method is derived also for axially deformed nuclei. The derived formulae are then implemented in the computer code and utilized for calculation of some physical results. After thorough investigation of the precision aspects of the calculation, the following topics are treated as examples: toroidal nature of the low-energy (pygmy) part of the E1 resonance, giant resonances of various multipolarities in deformed nucleus 154Sm, and magnetic dipole (M1) transitions in deformed 50Cr. Powered by TCPDF (www.tcpdf.org)

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Afonso, Joana Martins de Carvalho. "Skyr yogurts : the future of this emerging market". Master's thesis, 2018. http://hdl.handle.net/10400.14/26242.

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The aim of this dissertation is to analyse the possibilities of improving the Skyr yogurts market, by investigating the attitudes towards its consumption and consumers’ perceptions of this dairy. Therefore, the reasons why people are changing their concerns for their lifestyle, towards a healthier way of living, focusing mainly on their diets, are evaluated. The Functional Food category is, as such, used as a starting point, to assess the areas of study, namely: attitudes, acceptance and attributes. This study’s methodology consists of qualitative and quantitative research, and data was collected firstly through in-depth interviews with key opinion leaders in this area, Skyr consumers and non-consumers. Then, an online questionnaire was shared, which enabled the collection of 405 answers for further analysis. Concerning results, it is possible to find that people are concerned with living a healthier lifestyle, with special care for their diet and the practice of physical activities. Additionally, it is feasible to understand which attributes of Skyr yogurts positively influence the overall satisfaction of consumers, and analyse its consumption with the distinction of different sociodemographic characteristics. Therefore, it is possible to discover this emerging market, in particular its consumers and different competitors, considering Portugal. This research study, focused on Skyr yogurts, is a reasonable source for organizations in the food sector, to understand consumers’ preferences and the need for possible innovations in this area.
O objetivo deste estudo é analisar as possibilidades de favorecer o mercado dos Iogurtes Skyr, investigando as atitudes que levam ao seu consumo, e as perceções dos consumidores relativamente a este lacticínio. Assim, as razões que têm levado as pessoas a alterarem o seu estilo de vida, para uma atitude mais saudável, principalmente focada na alimentação, são analisadas. Desta forma, a categoria de alimentos com benefícios funcionais é utilizada como ponto de partida, de forma a determinar as áreas de estudo, nomeadamente: atitudes, aceitação e atributos. A metodologia deste estudo consiste numa pesquisa qualitativa e quantitativa, em que os dados foram recolhidos primeiramente através de entrevistas com líderes de opinião nesta área, consumidores e não-consumidores de Skyr. Seguidamente, um questionário foi partilhado, onde foi possível recolher 405 respostas para serem analisadas posteriormente. Considerando os resultados, é possível perceber que as pessoas estão a preocupar-se mais com o seu estilo de vida, especialmente com a alimentação e com a prática de exercício físico. Para além disso, é possível entender quais os atributos dos iogurtes Skyr que influenciam positivamente a satisfação global dos consumidores, e analisar o consumo considerando as diferentes características sociodemográficas. Deste modo, é possível descobrir este mercado emergente, especialmente os seus consumidores e diferentes concorrentes, considerando Portugal. Este estudo, focado nos iogurtes Skyr, é uma fonte plausível para as organizações que atuam no sector alimentar, de forma a perceberem as preferências e necessidades dos consumidores para possíveis inovações nesta área.

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Libri sul tema "Skyrme functionals"

Heldal, Rogardt. Functional Programming, Glasgow 1991: Proceedings of the 1991 Glasgow Workshop on Functional Programming, Portree, Isle of Skye, 12-14 August 1991. London: Springer London, 1992.

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Glasgow Workshop on Functional Programming. (1991 Portree, Scotland). Functional programming, Glasgow 1991: Proceedings of the 1991 Glasgow Workshop on Functional Programming, Portree, Isle of Skye, 12-14 August 1991. London: Springer-Verlag, 1992.

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Portree, Scotland) Glasgow Workshop on Functional Programming (1991, Carsten Kehler Holst e Rogardt Heldal. Functional Programming, Glasgow 1991: Proceedings of the 1991 Glasgow Workshop on Functional Programming, Portree, Isle of Skye, 12-14 August 1991 (Workshops in Computing). Springer, 1992.

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Capitoli di libri sul tema "Skyrme functionals"

Makhankov, Vladmir G., Yurii P. Rybakov e Valerii I. Sanyuk. "Absolute Minimum of the Energy Functional". In The Skyrme Model, 80–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84670-0_6.

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Bucholtz, Ianis, e Laura Sūna. "‘I Am One of Them’: Exploring the Communication of Identity of Latvian Migrants on Social Networking Sites". In IMISCOE Research Series, 231–57. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12092-4_11.

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Abstract This chapter analyses how ethnic transnational identities are manifested and negotiated on the social networking sites used by Latvian migrants. Although migrants as well as other people use various personal media, including Skype, chat apps such as WhatsApp and telephones, social networking sites stand out with the diversity of functions in migrant communication. This includes one-to-one exchanges, group communication and the ability to locate and connect with users who may or may not be familiar offline. We argue that social networking sites and particularly thematic groups on these sites that migrants create and join serve as forums or bulletin boards where they exchange practical information and are able to communicate with other Latvians who live nearby – and that these uses have implications for the communication of identity. The empirical data in the chapter comes from 20 semi-structured interviews with Latvian migrants who live in a variety of countries and were recruited for the study on social networking sites, as well as survey data, all of which were collected within the research project The Emigrant Communities of Latvia: National Identity, Transnational Relations and Diaspora Politics. The results demonstrate that migrant interactions on social networking sites do not necessarily lead to the homogenisation of migrants’ conception of what ‘being a Latvian’ means. The increased ability to maintain associations with diverse online and offline social circles provides a migrant with a variety of identity elements to associate with. As a result, hybrid identities may emerge. A migrant can identify with the host society yet still reject some of its characteristics – and choose Latvian alternatives instead.

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Atti di convegni sul tema "Skyrme functionals"

Duhan, Sukhvinder, Manjeet Singh Gautam, Hitender Khatri e Rishipal Chahal. "Structural study of stable (4He) and Halo (6He, 8He) helium isotopes using Skyrme pairing force-SKP modified SKM* and SLy4 functionals". In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2020): 5th National e-Conference on Advanced Materials and Radiation Physics. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052782.

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NAKATSUKASA, T., K. YABANA e T. INAKURA. "LINEAR RESPONSE CALCULATIONS WITH THE TIME-DEPENDENT SKYRME DENSITY FUNCTIONAL". In Proceedings of the International Symposium on the ISPUN07. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812776150_0030.

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LI, JUN, GIANLUCA COLÒ e JIE MENG. "MICROSCOPIC CALCULATIONS BASED ON A SKYRME FUNCTIONAL PLUS THE PAIRING CONTRIBUTION". In Proceedings of the International Symposium on the ISPUN07. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812776150_0071.

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YOSHIDA, K. "SKYRME ENERGY-DENSITY FUNCTIONAL APPROACH TO COLLECTIVE MODES OF EXCITATION IN EXOTIC NUCLEI". In Proceedings of the Fifth International Conference on ICFN5. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814525435_0042.

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Hellemans, V., M. Bender, P. H. Heenen, Matko Milin, Tamara Niksic, Suzana Szilner e Dario Vretenar. "Probing Time-Odd and Tensor Terms of The Skyrme Functional in Superdeformed Bands". In NUCLEAR STRUCTURE AND DYNAMICS ’09: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3232095.

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Roca-Maza, X., G. Colò, Li-Gang Cao e H. Sagawa. "A new Skyrme energy density functional for a better description of spin-isospin resonances". In Nuclear Structure and Dynamics ’15. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4932265.

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KVASIL, J., W. KLEINIG, V. O. NESTERENKO, P. G. REINHARD e P. VESELY. "TIME-DEPENDENT DENSITY FUNCTIONAL THEORY WITH SKYRME FORCES: DESCRIPTION OF GIANT RESONANCES IN DEFORMED NUCLEI". In Proceedings of the 9th International Spring Seminar on Nuclear Physics. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779038_0048.

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Hellemans, V., M. Bender, P. H. Heenen, Jan Jolie, Andreas Zilges, Nigel Warr e Andrey Blazhev. "Probing the effects of the time-odd terms in the Skyrme functional in superdeformed bands". In CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: Proceedings of the 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics. AIP, 2009. http://dx.doi.org/10.1063/1.3087074.

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Yamagami, Masayuki, e Kenich Matsuyanagi. "Rotational Effect on Octupole Vibrations in Superdeformed Nuclei Studied by Cranked RPA Calculation with Skyrme Density Functional". In Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014). Journal of the Physical Society of Japan, 2015. http://dx.doi.org/10.7566/jpscp.6.030051.

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