Search results for "Miti"
showing 10 items of 1065 documents
Il principio di correttezza e buona fede come limite all’abuso di maggioranza
2016
Una delibera assembleare può essere invalidata ex art. 2479 ter c.c. per abuso di maggioranza, quando risulta fraudolentemente ed esclusivamente preordinata dai soci di maggioranza al perseguimento di una lesione degli interessi della minoranza, in violazione del principio di correttezza nell’adempimento dell’obbligazione e di buona fede nell’esecuzione del contratto. Può costituire motivo di impugnazione della delibera per conflitto di interessi l’abusivo esercizio del voto da parte di un socio che persegue un interesse personale proprio antitetico all’interesse sociale, con conseguente concreto o potenziale danno per la società. È possibile ancorare il giudizio di legittimità della delibe…
Pseudo-Bosons from Landau Levels
2010
We construct examples of pseudo-bosons in two dimensions arising from the Hamiltonian for the Landau levels. We also prove a no-go result showing that non-linear combinations of bosonic creation and annihilation operators cannot give rise to pseudo-bosons.
Finite-dimensional pseudo-bosons: a non-Hermitian version of the truncated harmonic oscillator
2018
We propose a deformed version of the commutation rule introduced in 1967 by Buchdahl to describe a particular model of the truncated harmonic oscillator. The rule we consider is defined on a $N$-dimensional Hilbert space $\Hil_N$, and produces two biorhogonal bases of $\Hil_N$ which are eigenstates of the Hamiltonians $h=\frac{1}{2}(q^2+p^2)$, and of its adjoint $h^\dagger$. Here $q$ and $p$ are non-Hermitian operators obeying $[q,p]=i(\1-Nk)$, where $k$ is a suitable orthogonal projection operator. These eigenstates are connected by ladder operators constructed out of $q$, $p$, $q^\dagger$ and $p^\dagger$. Some examples are discussed.
From pseudo-bosons to pseudo-Hermiticity via multiple generalized Bogoliubov transformations
2016
We consider the special type of pseudo-bosonic systems that can be mapped to standard bosons by means of generalized Bogoliubov transformation and demonstrate that a pseudo-Hermitian systems can be obtained from them by means of a second subsequent Bogoliubov transformation. We employ these operators in a simple model and study three different types of scenarios for the constraints on the model parameters giving rise to a Hermitian system, a pseudo-Hermitian system in which the second the Bogoliubov transformations is equivalent to the associated Dyson map and one in which we obtain D-quasi bases.
In search of Experimental Evidence for Secondary Antisemitism
2019

 
 
 In 1955, Adorno attributed antisemitic sentiments voiced by Germans to a paradox projection: The only latently experienced feelings of guilt were warded off by antisemitic defense mecha- nisms. Similar predictions of increases in antisemitic prejudice in response to increased Holo- caust salience follow from other theoretical apparatuses (e.g., social identity theory as well as just-world theory). Based on the – to the best of our knowledge – only experimental evidence for such an effect (published in Psychological Science in 2009), the present research reports a series of studies originally conducted to better understand the contribution of the different assumed mechan…
Palliative ventilatory support: same knowledge, different goal.
2018
Palliative care as a clinical field emerged in the 1990s, aiming at improving end-of-life (EOL) experience for seriously ill patients (1). It changed the way to approach families saying them that their loved ones were approaching the end limiting life support while maintain comfort (2). It is now also evident that palliative care has not only to be seen as the job of consultants or by specialists in this field but also an approach to care at the “primary” level by intensivist, intensive care unit (ICU) nurses, and other clinicians (2).
Postoperative continuous positive airway pressure to prevent pneumonia, re-intubation, and death after major abdominal surgery (PRISM): a multicentre…
2021
BackgroundRespiratory complications are an important cause of postoperative morbidity. We aimed to investigate whether continuous positive airway pressure (CPAP) administered immediately after major abdominal surgery could prevent postoperative morbidity.MethodsPRISM was an open-label, randomised, phase 3 trial done at 70 hospitals across six countries. Patients aged 50 years or older who were undergoing elective major open abdominal surgery were randomly assigned (1:1) to receive CPAP within 4 h of the end of surgery or usual postoperative care. Patients were randomly assigned using a computer-generated minimisation algorithm with inbuilt concealment. The primary outcome was a composite of…
Gibbs states, algebraic dynamics and generalized Riesz systems
2020
In PT-quantum mechanics the generator of the dynamics of a physical system is not necessarily a self-adjoint Hamiltonian. It is now clear that this choice does not prevent to get a unitary time evolution and a real spectrum of the Hamiltonian, even if, most of the times, one is forced to deal with biorthogonal sets rather than with on orthonormal basis of eigenvectors. In this paper we consider some extended versions of the Heisenberg algebraic dynamics and we relate this analysis to some generalized version of Gibbs states and to their related KMS-like conditions. We also discuss some preliminary aspects of the Tomita-Takesaki theory in our context.
$O^\star$-algebras and quantum dynamics: some existence results
2008
We discuss the possibility of defining an algebraic dynamics within the settings of O -algebras. Compared to our previous results on this subject, the main improvement here is that we are not assuming the existence of some Hamiltonian for the full physical system. We will show that, under suitable conditions, the dynamics can still be defined via some limiting procedure starting from a given regularized sequence. © 2008 American Institute of Physics.
Bessel sequences, Riesz-like bases and operators in Triplets of Hilbert spaces
2016
Riesz-like bases for a triplet of Hilbert spaces are investigated, in connection with an analogous study for more general rigged Hilbert spaces performed in a previous paper. It is shown, in particular, that every \(\omega \)-independent, complete (total) Bessel sequence is a (strict) Riesz-like basis in a convenient triplet of Hilbert spaces. An application to non self-adjoint Schrodinger-type operators is considered. Moreover, some of the simplest operators we can define by them and their dual bases are studied.