149 research outputs found
A Geometric Identity for Index Theory
No full textPresented at the QMath13 Conference: Mathematical Results in Quantum Theory, October 8-11, 2016 at the Clough Undergraduate Learning Commons, Georgia Tech.New Mathematical Topics Arising in Current Theoretical Physics - Saturday, October 8th, 2016, Skiles 202 - Chair: Robert SeiringerEmil Prodan is with the Yeshiva University, New York, NY
Preferential Solvation in Carbonyl-Twisted PRODAN Derivatives
No full textThe
Rosés and Bosch model for preferential solvation is
used to analyze the fluorescence behavior of two PRODAN derivatives
in binary solvents with one or two protic components. The preferential
solvation results suggest that the excited PRODAN derivatives form
two H-bonds. The model allows for determining the characteristics
of the singly H-bonded excited states. They show red-shifted fluorescence
but relatively little quenching. In contrast, the doubly H-bonded
excited states are significantly quenched when the protic solvent
is a strong H-bond donor (large SA value). With two protic solvents
there is little preferential interaction even though the solvents
have very different H-bond-forming ability
Tendinţele şi problemele angajării tinerilor pe piaţa muncii
No full textPRODAN, Mariana. Tendinţele şi problemele angajării tinerilor pe piaţa muncii. In: Competitivitatea şi inovarea în economia cunoaşterii [online]: conf. şt. intern., 22-23 sept., 2017: Culegere de articole. Chişinău: ASEM, 2018, vol. 4, pp. 87-92. E-ISBN 978-9975-75-899-4.This article is oriented to reflect the characteristics of the labor market on which main actors are the young people of Moldova. There have been designated the main issues and the disadvantages that meet young people of Moldova, generated by the economic crisis and the last hour opportunities. Simultaneously, in order to provide a comparative analyze, the author is referring to the main trends of the European Union labor market in the field of young people employment. Finally, a range of conclusions concerning the ways of improvement of these issues are presented, as well as a series of recommendations for reducing the disadvantages of Moldovan young people on labor market. JEL CLASSIFICATION: A2
A computational non-commutative geometry program for disordered topological insulators
No full textThis work presents a computational program based on the principles of non-commutative geometry and showcases several applications to topological insulators. Noncommutative geometry has been originally proposed by Jean Bellissard as a theoretical framework for the investigation of homogeneous condensed matter systems. Recently, this approach has been successfully applied to topological insulators, where it facilitated many rigorous results concerning the stability of the topological invariants against disorder. In the first part of the book the notion of a homogeneous material is introduced and the class of disordered crystals defined together with the classification table, which conjectures all topological phases from this class. The manuscript continues with a discussion of electrons’ dynamics in disordered crystals and the theory of topological invariants in the presence of strong disorder is briefly reviewed. It is shown how all this can be captured in the language of noncommutative geometry using the concept of non-commutative Brillouin torus, and a list of known formulas for various physical response functions is presented. In the second part, auxiliary algebras are introduced and a canonical finite-volume approximation of the non-commutative Brillouin torus is developed. Explicit numerical algorithms for computing generic correlation functions are discussed. In the third part upper bounds on the numerical errors are derived and it is proved that the canonical-finite volume approximation converges extremely fast to the thermodynamic limit. Convergence tests and various applications concludes the presentation. The book is intended for graduate students and researchers in numerical and mathematical physics
TRANSNATIONAL PERSPECTIVES IN “THE HISTORY OF CONTEMPORARY ROMANIAN LITERATURE”
No full textTransnational Perspectives in The History of Contemporary Romanian Literature. Discussing literature from a global perspective requires a transnational view on the evolution and international integration of literature. Most recent World Literature studies imply such an analytic perspective when questioning the recognition of certain national literatures within the more developed ones. While using concepts such as “minor” or “major literature” or, more precisely, “central” or “peripheral literature,” attention needs to be paid, Prodan argues, when talking about the global acknowledgement of literature, especially of those literatures coming from “minor” and even isolated cultures. In The History of Contemporary Romanian Literature: 1990-2020, Mihai Iovănel proposes a thematic rather than a historical analysis of contemporary national literature with its periodized and temporal evolutions. The author includes, especially in the last chapter of his literary history, a transnational view of contemporary Romanian literature. Therefore, the main purpose of this paper is to analyse the way Romanian writers and their literary works are perceived by the critic as having “a transnational character.” Prodan also investigates how Iovănel succeeds in renewing critical strategies in literary historiography. Thus, this contribution is mainly dedicated to the last part of Mihai Iovănel’s History, which seeks out new strategies of transnational expansion of the spectrum of national literature, as the author also analyses the possibilities of a global integration and marketing of contemporary Romanian literature.
Article history: Received 31 January 2022; Revised 19 August 2022; Accepted 31 August 2022; Available online 20 September 2022; Available print 30 September 2022
REZUMAT: Perspective transnaționale în Istoria literaturii române contemporane. O analiză a literaturii la nivel global implică o perspectivă transnațională asupra evoluției și a integrării acesteia pe piața internațională. Studiile recente aparținând literaturii globale (World Literature) presupun tocmai o astfel de analiză a investigării modului în care anumite literaturi naționale s-au dezvoltat în cadrul literaturilor globale. Utilizând concepte precum „literatură minoră” sau „majoră” sau, mai precis, „literatură centrală” și „periferică,” o analiză a fenomenului este necesară, după părerea mea, în special în cazul afirmării la nivel internațional a unor literaturi provenind din culturi „minore” sau chiar izolate. Mihai Iovănel, în Istoria literaturii române contemporane. 1990-2020, propune o analiză mai degrabă tematică a literaturii naționale contemporane, iar nu una istorică, analizată prin intermediul evoluțiilor literare temporale. Autorul integrează, îndeosebi în ultimul capitol al istoriei sale literare, o perspectivă transnațională asupra literaturii române contemporane. Astfel, lucrarea de față își propune o analiză a modului în care scriitorii români și operele acestora sunt percepute de criticul literar drept o literatură „cu specific transnațional” și, mai mult decât atât, a modalității prin care Iovănel reușește să inoveze strategiile de interpretare critică în istoriografia literară. Un studiu, așadar, dedicat în speță ultimei părți a Istoriei... lui Mihai Iovănel, având scopul de a identifica noi strategii de extindere a spectrului literar național înspre unul transnațional, căci autorul analizează posibilitățile de integrare și promovare a literaturii naționale contemporane la nivel global.
Cuvinte-cheie: literatură transnațională, literatură națională, migrație, istorie literară, periodizar
Topological phonon modes and their role in dynamic instability of microtubules
No full textMicrotubules (MTs) are self-assembled hollow protein tubes playing important functions in live cells. Their building block is a protein called tubulin, which self-assembles in a particulate 2 dimensional lattice. We study the vibrational modes of this lattice and find Dirac points in the phonon spectrum. We discuss a splitting of the Dirac points that leads to phonon bands with nonzero Chern numbers, signaling the existence of topological vibrational modes localized at MTs edges, which we indeed observe after explicit calculations. Since these modes are robust against the large changes occurring at the edges during the dynamic cycle of the MTs, we can build a simple mechanical model to illustrate how they would participate in this phenomenon. © 2009 The American Physical Society
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