Alpha-like quartet condensation and isovector pairing correlations in N=Z nuclei

We propose a simple quartet condensation model (QCM) which describes with very high accuracy the isovector pairing correlations in self-conjugate nuclei. The quartets have an alpha-like structure and are formed by collective isovector pairs. The accuracy of the QCM is tested for N=Z nuclei for which exact shell model diagonalizations can be performed. The calculations are done with two isovector pairing forces, one extracted from standard shell model interactions and the other of seniority type, acting, respectively, upon spherical and axially-deformed single-particle states. It is shown that for all calculated nuclei the QCM gives very accurate values for the pairing correlations energies, with errors which do not exceed 1%. These results show clearly that the correlations induced by the isovector pairing in self-conjugate nuclei are of quartet type and also indicate that QCM is the proper tool to calculate the isovector proton-neutron correlations in mean field pairing models.Comment: 11 pages, two table

A STOCHASTIC MODELING FOR THE UNSTABLE FINANCIAL MARKETS

Considering the present economic context, the measurement of performances has become a permanent preoccupation for organizations, since the whole process is based on it, offering the necessary feedback to identify both the positive actions which have led to favorable results for the organization, and the negative ones, in order to correct them in the future. To do this, we have to measure what is most importantly to measure. Starting from these considerations, the present paper approaches from a theoretical and practical point of view the economic rate of return as the indicator which synthesizes best an organization’s financial-economic performance. We have calculated and analyzed the economic rate of return for a group of Ten Romanian Firms in the food industry, through different calculation relations, pointing out the advantages/disadvantages of each calculation method.belated integral, forward-backward stochastic equations, pathwise uniqueness, financial modeling.

Pairing and alpha-like quartet condensation in N=Z nuclei

We discuss the treatment of isovector pairing by an alpha-like quartet condensate which conserves exactly the particle number, the spin and the isospin. The results show that the quartet condensate describes accurately the isovector pairing correlations in the ground state of systems with an equal number of protons and neutronsComment: 4 pages, to appear in Journal of Physics: Conference Serie

Structure of the quartetting ground state of N=ZN=Z nuclei

The formal equivalence between the quartetting picture and the symmetry restored BCS picture is established for the ground state correlations induced by the general isovector-isoscalar pairing interaction. Multiple ground state structures compatible with the particle number and isospin symmetries are evaluated. The competition of isovector and isoscalar correlations is discussed for the $N=Z$ nuclei above $^{100}$Sn.Comment: 5 pages, 1 figur

Ferroelectricity modulates polaronic coupling at multiferroic interfaces

Physics of the multiferroic interfaces is currently understood mostly within a phenomenological framework based on screening of the polarization field and depolarizing charges. Additional effects still unexplored are the band dependence of the interfacial charge modulation and the associated changes of the electron-phonon interaction, coupling the charge and lattice degrees of freedom. Here, multiferroic heterostructures of the colossal-magnetoresistance manganite La1-xSrxMnO3 buried under ferroelectric BaTiO3 and PbZrxTi1-xO3 are investigated using soft-X-ray angle-resolved photoemission. The experimental band dispersions from the buried La1-xSrxMnO3 identify coexisting two-dimensional hole and three-dimensional electron charge carriers. The ferroelectric polarization modulates their charge density, affecting the coupling of the 2D holes and 3D electrons with the lattice which forms large Fröhlich polarons inherently reducing mobility of the charge carriers. Our k-resolved results on the orbital occupancy, band filling and electron-lattice interaction in multiferroic oxide heterostructures modulated by the ferroelectric polarization disclose most fundamental physics of these systems needed for further progress of beyond-CMOS ferro-functional electronics

Opinionated texts in social media: A proposal for evaluative judgement methodology

The paper reports on a pilot study devoted to the analysis of opinions expressed by Facebook discussants related to the immigration crisis in Europe. Opinions were conceptualised as the subjective expression of evaluation. The data were investigated in line with an original, tripartite typology consisting of 46 criteria of evaluative language coming from distinct scholarly traditions: media studies, linguistics and Critical Discourse Analysis. Generally speaking, the proposed templates proved effective when mapped onto social media data; however, as there is a partial overlap of some of the categories used in the pilot study, the number of categories needs to be reduced in the subsequent investigation. The secondary objective of this paper is to present computational tools employed in the study, which, as the study shows, can enrich research methodology in communication studies, and these comprise the “R” package used for data visualisation and lexical and sentence-based embeddings based on LLM.Niniejszy artykuł stanowi raport z badania pilotażowego poświęconego analizie opinii wyrażanych przez dyskutantów na Facebooku na temat kryzysu imigracyjnego w Europie. Opinie rozumiane są w tym badaniu jako subiektywne wyrażanie oceny. Dane zostały przeanalizowane według zaproponowanej trójczłonowej typologii składającą się z 46 kryteriów języka oceniającego. Kryteria te pochodzą z różnych tradycji naukowych: medioznawstwa, językoznawstwa i krytycznej analizy dyskursu. Zaproponowane szablony okazały się skuteczne w odniesieniu do danych z mediów społecznościowych; jednakże, ze względu na częściowe nakładanie się niektórych kategorii użytych w badaniu pilotażowym, w dalszych badaniach liczba kategorii musi zostać zmniejszona. Drugim celem tego artykułu jest przedstawienie narzędzi komputerowych użytych w niniejszej analizie. Jak wskazuje zaprezentowana analiza narzędzia te mogą wzbogacić metodologię badań w dziedzinie komunikacji. Zastosowane narzędzia to pakiet „R” używany do wizualizacji danych, biblioteki Python oraz osadzenia (embeddings) leksykalne i zdaniowe oparte na LLM.info:eu-repo/semantics/publishedVersio