Search results for "operators"
showing 8 items of 228 documents
Simplified stock markets and their quantum-like dynamics
2009
In this paper we continue our systematic analysis of the operatorial approach previously proposed in an economical context and we discuss a mixed toy model of a simplified stock market, i.e. a model in which the price of the shares is given as an input. We deduce the time evolution of the portfolio of the various traders of the market, as well as of other observable quantities. As in a previous paper, we solve the equations of motion by means of a fixed point like approximation.
Quantitative Approximation Properties for the Fractional Heat Equation
2017
In this note we analyse \emph{quantitative} approximation properties of a certain class of \emph{nonlocal} equations: Viewing the fractional heat equation as a model problem, which involves both \emph{local} and \emph{nonlocal} pseudodifferential operators, we study quantitative approximation properties of solutions to it. First, relying on Runge type arguments, we give an alternative proof of certain \emph{qualitative} approximation results from \cite{DSV16}. Using propagation of smallness arguments, we then provide bounds on the \emph{cost} of approximate controllability and thus quantify the approximation properties of solutions to the fractional heat equation. Finally, we discuss genera…
MR3535311 Reviewed Inoue, H.(J-KYUSGM); Takakura, M.(J-FUE-AM) Regular biorthogonal pairs and pseudo-bosonic operators. (English summary) J. Math. Ph…
2017
Given a pair of operators a and b acting on a Hilbert space H, such that [a,b]=1, the authors give a method to construct a regular bi-orthogonal pair of sequences in H. They study the relationship between the conditions on a,b,a†,b† and the operators Ae,Be,A†e,B†e, considered by one of the authors in a previous paper, in the set-up of a general theory of bi-orthogonal pair sequences. Then they give a method to construct operators A and B with the so-called D-pseudo bosons conditions, i.e. the commutation rule and some assumptions, on a dense subspace D of H, considered in the literature. Finally, some physical examples are given.
Le cause di esclusione di cui all’art. 80 D.Lgs. n. 50/2016 tra Linee guida dell’ANAC e principi di tassatività e legalità
2017
This paper, concerning the Guidelines adopted by the ANAC on the subject of "Indication adequate means of proof and deficiencies in the performance of a previous procurement contract which may be considered significant for demonstrating the circumstances of exclusion pursuant to art. 80 paragraph 5, lett. c) of the code”, aims to highlight on the one hand how, the alleged optional nature of the same, recognizing to the individual contracting stations the right to decide on the applicability of the Lines themselves, could, on the one hand, lead to situations potentially harmful to the constitutional principles pursuant to articles 3, 41 and 117, paragraph 2, lett. e) of the Constitution, to …
Ergonomiskie riski un veselības veicināšanas pasākumi degvielas uzpildes stacijās uzņēmumā Virši-A
2022
„Ergonomiskie riski un veselības veicināšanas pasākumi degvielas uzpildes stacijās uzņēmumā AS “Virši-A” ”. Darba autore: Ilva Lazorenko. Darba zinātniskais vadītājs: profesors Henrijs Kaļķis. Darbs izklāstīts uz 77 lpp., ietver 24 attēlus, 7 tabulas, 5 pielikumus, 45 informatīvos avotus. Maģistra darbs sastāv no 4 daļām. Pirmajā daļā ir apskatīta un analizēta literatūra par ergonomiskiem riskiem degvielas uzpildes staciju darbinieku darba procesā. Pētījuma otrajā daļā aprakstītas pētījumā pielietotās metodes, trešajā daļā - iegūto rezultātu analīze un rezultātu iztirzāšana, ceturtajā daļā izstrādāti veselības veicināšanas pasākumi. Pētījuma rezultāti par degvielas uzpildes staciju darbinie…
Stress in emergency telephone number operators during the COVID-19 pandemic: the role of self-efficacy and Big Five personality traits
2022
BackgroundEmergency telephone number operators experience many challenges in their work during the COVID-19 pandemic. Their personality traits and self-efficacy may act as important factors in their level of perceived stress. The aim of this study was to determine the relationship between Big Five personality traits, self-efficacy and perceived stress among emergency tele-phone number operators during the COVID-19 pandemic.Participants and procedureOne hundred emergency telephone number operators participated in the study. The Perceived Stress Scale (PSS-10), Ten Item Personality Inventory (TIPI) and Generalized Self Efficacy Scale (GSES) were used.ResultsEmergency telephone number operator…
Sakārtotie svārstīgie nestriktie Hamahera agregācijas operatori daudzkritēriju lēmumu pieņemšanā
2017
Bakalaura darba ir veltīts sakārtotie svārstīie nestriktie Hamahera agregācijas operatoru un to pielietojums daudzkritēriju lēmumu pieņemšanā. Darbā aprakstīti tādi jēdzieni, kā t-norma, t-konorma, involūcija, svārstīga nestrikta kopa, svārstīgu nestriktu elementu sakārtojums, kuri nepieciešami, lai definētu sakārtotu svārstīgo nestrikto agregācijas operatoru. Balstoties uz šiem operātoriem aprakstīts daudzkritēriju lēmumu pieņemšanas modelis, kas ilustrēts ar praktiskiem piemēriem.
Constant sign and nodal solutions for parametric anisotropic $(p, 2)$-equations
2021
We consider an anisotropic ▫$(p, 2)$▫-equation, with a parametric and superlinear reaction term.Weshow that for all small values of the parameter the problem has at least five nontrivial smooth solutions, four with constant sign and the fifth nodal (sign-changing). The proofs use tools from critical point theory, truncation and comparison techniques, and critical groups. Spletna objava: 9. 9. 2021. Abstract. Bibliografija: str. 1076.