Search results for " Operator"

Normalized Solutions to the Fractional Schrödinger Equation with Potential

2023

AbstractThis paper is concerned with the existence of normalized solutions to a class of Schrödinger equations driven by a fractional operator with a parametric potential term. We obtain minimization of energy functional associated with that equations assuming basic conditions for the potential. Our work offers a partial extension of previous results to the non-local case.

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.

The existence of solutions for the modified (p(x), q(x))-Kirchhoff equation

2022

We consider the Dirichlet problem-Delta(Kp)(p(x))u(x) - Delta(Kq)(q(x))u(x) = f(x, u(x), del u(x)) in Omega, u vertical bar(partial derivative Omega) = 0,driven by the sum of a p(x)-Laplacian operator and of a q(x)-Laplacian operator, both of them weighted by indefinite (sign-changing) Kirchhoff type terms. We establish the existence of weak solution and strong generalized solution, using topological tools (properties of Galerkin basis and of Nemitsky map). In the particular case of a positive Kirchhoff term, we obtain the existence of weak solution (= strong generalized solution), using the properties of pseudomonotone operators.

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 …

Resolvent estimates for elliptic quadratic differential operators

2011

Sharp resolvent bounds for non-selfadjoint semiclassical elliptic quadratic differential operators are established, in the interior of the range of the associated quadratic symbol.

IMPLEMENTATION OF A QUALITY MANAGEMENT SYSTEM IN A TRAVEL AGENCY

2014

The present research refers to the major problems existing in the Romanian tourism, namely, "manufacturing" and commercialization of certain products non-compliant with the user’s requirements in terms of quality. In tourism and hospitality industry, quality can be judged on the extent to which the service received meets the customer’s expectations. So, the quality is important for both customers and managers of various travel agencies, as it can contribute to making better products at lower costs. Based on theoretical approaches on quality management of tourist services, this paper aims to analyze the activity of the largest travel agency in Romania - Happy Tour and assess the possibilitie…

Indagine conoscitiva sui requisiti organizzativi-strutturali dei complessi operatori svolta presso l'AOUP "Paolo Giaccone" di Palermo

2007

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.

Representing compact sets of compact operators and of compact range vector measures

1987