Search results for "Operator"

Solutions with sign information for nonlinear Robin problems with no growth restriction on reaction

2019

We consider a parametric nonlinear Robin problem driven by a nonhomogeneous differential operator. The reaction is a Carathéodory function which is only locally defined (that is, the hypotheses concern only its behaviour near zero). The conditions on the reaction are minimal. Using variational tools together with truncation, perturbation and comparison techniques and critical groups, we show that for all small values of the parameter λ > 0, the problem has at least three nontrivial smooth solutions, two of constant sign and the third nodal.

Explaining Causes Behind SQL Query Formulation Errors

2020

This Full Research Paper presents the most prominent query formulation errors in Structured Query Language (SQL), and maps these errors to their cognitive explanations. Understanding query formulation errors is a key to teaching SQL. more effectively. However, studies on what kind of errors novices struggle with are relatively scarce when compared to, for example, programming languages. Although committing errors is a crucial part in learning, some errors are relatively easy to fix, and their commonness is not necessarily an indication of their difficulty. Other errors, however, halt the learning process, and are never fixed by the query writer. Using a previously established error taxonomy…

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.

Elektroniczny system przeprowadzania egzaminu zawodowego

2017

Rosnąca rola nowych technologii spowodowała zmiany w sposobie przeprowadzania egzaminu zawodowego. Jedną z nich jest możliwość przeprowadzania egzaminu teoretycznego w wersji elektronicznej. W opracowaniu przedstawione zostały procedury związane z tą formą zewnętrznego oceniania uczestników kształcenia zawodowego. Zamieszczone zostały również dane statystyczne obrazujące odsetek szkół korzystających z tego rozwiązania.

Valutazione del rischio infettivo occupazionale nell’A.O.U.P. di Palermo: dieci anni di sorveglianza

2011

Nel presente lavoro sono stati esaminati gli eventi infortunistici occupazionali a rischio biologico avvenuti nell’Azienda Ospedaliera Universitaria Policlinico di Palermo nel decennio 2000-2011 al fine di rilevarne l’incidenza, anche in considerazione degli interventi di prevenzione adottati, le circostanze dell’evento, le categorie professionali maggiormente a rischio, le caratteristiche dell’operatore sanitario e, se noto, il quadro sierologico del paziente fonte. A tale scopo è stato esaminato un data-base dell’Azienda in cui vengono inseriti i suddetti dati al momento dell’incidente occupazionale a rischio infettivologico. Dall’elaborazione degli stessi è emerso che nell’anno 2000 l’in…

Sorveglianza dinamica e regime aperto. Cambiamenti normativi, organizzativi e psicosociali

2017

La condanna che la Corte Europea dei Diritti Umani (2013) ha inflitto all'Italia alla luce della sentenza Torreggiani che puntava l'indice sul trattamento inumano e sul sovraffollamento degli istituti penali, ha imposto al nostro Paese repentini cambiamenti nell'assetto organizzativo che hanno, chiaramente, influenzato la quotidianità sia dei ristretti sia degli operatori penitenziari. A questi ultimi è chiesto, infatti, un impegno nella sperimentazione della gestione di nuovi spazi e di un nuovo modus operandi che va a modificare il modo di relazionarsi con l’utente e con il gruppo di lavoro, esaltando le rispettive potenzialità professionali. Ai ristretti, ancora, è riconosciuta la possib…

Ergonomiskie darba vides riska faktori šūšanas iekārtu operatoriem un preventīvie pasākumi veselības veicināšanai

2020

Maģistra darbā pētīti ergonomiskie darba vides riska faktori šūšanas iekārtu operatoriem, pielietojot ergonomisko risku specializetās un psiholoģiskā klimata darba vides novērtēšanas un darbspēju indeksa noteikšanas metodes.Izstrādātas praktiskās rekomendācijas ergonomisko risku mazināšanai.

violenza e minori: le rappresentazioni del fenomeno negli operatori

2013

Modeling epidemics through ladder operators

2020

Highlights • We propose an operatorial model to describe epidemics. • The model describes well the asymptotic numbers of the epidemics. • Ladder operators are used to model exchanges between the “actors” of the system.

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…