Search results for " Operator"
showing 10 items of 931 documents
Modeling by the finite element method of acoustic radiation in waveguides lined with locally or non locally reacting absorbent materials in the prese…
2011
Our concern in this work is the problem of acoustic propagation in guides lined with locally or non locally reacting materials with the presence of mean fluid flow. In several industrial systems such as aircraft jet engines, mufflers exhaust and ventilation systems, noise is mostly channeled outside by guides of more or less complex geometries. A study of waveguides makes it possible to predict and understand the physical phenomena such as refraction, convection, absorption and wave attenuation. In waveguides studies, guides are often considered infinitely long to get rid of some phenomena (reflection for example) at their ends. Solving the problem of acoustic propagation in infinite guides…
A Symplectic Kovacic's Algorithm in Dimension 4
2018
Let $L$ be a $4$th order differential operator with coefficients in $\mathbb{K}(z)$, with $\mathbb{K}$ a computable algebraically closed field. The operator $L$ is called symplectic when up to rational gauge transformation, the fundamental matrix of solutions $X$ satisfies $X^t J X=J$ where $J$ is the standard symplectic matrix. It is called projectively symplectic when it is projectively equivalent to a symplectic operator. We design an algorithm to test if $L$ is projectively symplectic. Furthermore, based on Kovacic's algorithm, we design an algorithm that computes Liouvillian solutions of projectively symplectic operators of order $4$. Moreover, using Klein's Theorem, algebraic solution…
Agenti biologici in ambienti di lavoro non sanitari.
2008
Le Linee Guida su rischi specifici redatte dalla Società Italiana di Medicina del Lavoro offrono ai Medici Competenti di tutto il territorio nazionale la possibilità di orientarsi nell'approccio alla sorveglianza sanitaria rivolta a lavoratori esposti a rischi specifici. Il presente volume affronta la problematica del rischio biologico nei vari contesti lavorativi estranei al comparto della Sanità.
Valutazione metodologica della contaminazione microbica dell’aria in sala operatoria: campionamento attivo e campionamento passivo
2010
OBIETTIVI: Valutazione della qualità microbiologica dell’aria nelle sale operatorie dell’A.O.U.P. “P. Giaccone” di Palermo mediante metodi di campionamento attivo e passivo. MATERIALI: Nel secondo semestre del 2009 sono stati effettuati campionamenti di aria in 20 sale operatorie (10 a flusso laminare e 10 a flusso turbolento) sia in condizioni di attività sia in condizioni di riposo. I punti di prelievo per il campionamento attivo sono stati: 1) il centro stanza 2) il VCCC; per il campionamento passivo 1) centro stanza 2) fondo stanza. Sono stati monitorati i seguenti parametri: carica batterica totale (CBT), carica micetica totale (CMT), Staphilococcus aureus ed Indice Microbico Aria (IMA…
LA VALUTAZIONE DELLE PROPRIE COMPETENZE SOCIO-RELAZIONALI NEI LAVORATORI DEL SOCIALE: UNO STRUMENTO DI INDAGINE
2009
Coloro i quali hanno maturato una esperienza, anche piccola, presso una struttura di assistenza sociale e di cura, sanno quanto sia importante che gli operatori che la compongono siano dotati di alcune competenze che caratterizzano tale mestiere. Ci riferiamo alle cosiddette competenze sociali e relazionali, che unite alle conoscenze teoriche ed applicative completano il quadro delle richieste dell’ambiente lavorativo in questione. Il possesso di tali competenze consente il doppio vantaggio di agire correttamente con la propria utenza nell’erogare l’aiuto di cui necessita, e allo stesso tempo di preservare il lavoratore stesso da stati di forte stress legati ad una mansione che, senza gli “…
New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spalla…
2021
Abstract The violation of baryon number, B , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation ( n → n ̄ ) via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state ( n → [ n ′ , n ̄ ′ ] → n ̄ ), and neutron disappearan…
Operatori penitenziari: richieste del cambiamento e profili organizzativi
2017
Il volume intende riflettere sul riassetto organizzativo che ha influenzato la quotidianità sia dei ristretti sia degli operatori penitenziari dopo la condanna che la Corte Europea dei Diritti Umani ha inflitto all’Italia alla luce della sentenza Torreggiani, che puntava l’indice sul trattamento inumano e sul sovraffollamento degli istituti penali.
A Peer-to-Peer Market Algorithm for a Blockchain Platform
2020
In an era of technological revolution in which everything becomes smarter and connected, the blockchain can introduce a new model for energy transactions able to grant more simplicity, security and transparency for end-users. The blockchain technology is characterized by a distributed architecture without a trusted and centralized authority, and, therefore, it appears as the perfect solutions for managing exchanges between peers. In this paper, a market algorithm that can be easily transferred to a smart contract for maximizing the match between produced and consumed energy in a micro-grid is presented. The algorithm supports energy transactions between peers (both producers and consumers) …
On the use of generalized harmonic means in image processing using multiresolution algorithms
2019
In this paper we design a family of cell-average nonlinear prediction operators that make use of the generalized harmonic means and we apply the resulting schemes to image processing. The new famil...
Mobile Electronic Commerce: Emerging Issues
2000
There are many definitions for Mobile Electronic Commerce (M-Commerce). We define M-Commerce as any type of transaction of an economic value having at least at one end a mobile terminal and thus using the mobile telecommunications network. The Wireless Application Protocol (WAP) plays an important role in m-commerce by optimizing Internet standards for the constraints of the wireless environment and thus bridging the gap between Internet and mobile world. Mobile Network Operators can play a major role in m-commerce by being strategically positioned between customers and content/service providers. In this paper we investigate the roles the operator can play in m-commerce and discuss respecti…