Search results for " Opera"
showing 10 items of 3606 documents
The Effect of Interferences on the Uptake of Heavy Metals by Sodium (iron) Titanates from Waste Water
2007
Sodium hexatitanate, sodium trititanate, sodium nonatitanate, and a new iron doped sodium nonatitanate were synthesized. Common interferences present in waste waters that hinder the removal of heavy metals by these ion exchangers were investigated. The presence of K+, Mg2+ and Ca2+ at 0.001-0.05 M concentration had minor effect on the amount of Pb2+, Cr3+, and Ni2+ uptake. EDTA on the other hand, interferes tremendously with the metal uptake. Both in ternary and in single system, the selectivity series is in the order: Pb2+>Cr3+>Ni2+. This order changed to Cr3+>Pb2+>Ni2+, in the presence of 0.001-0.1 M EDTA at pH 5.
Unique continuation results for certain generalized ray transforms of symmetric tensor fields
2022
Let $I_{m}$ denote the Euclidean ray transform acting on compactly supported symmetric $m$-tensor field distributions $f$, and $I_{m}^{*}$ be its formal $L^2$ adjoint. We study a unique continuation result for the normal operator $N_{m}=I_{m}^{*}I_{m}$. More precisely, we show that if $N_{m}$ vanishes to infinite order at a point $x_0$ and if the Saint-Venant operator $W$ acting on $f$ vanishes on an open set containing $x_0$, then $f$ is a potential tensor field. This generalizes two recent works of Ilmavirta and M\"onkk\"onen who proved such unique continuation results for the ray transform of functions and vector fields/1-forms. One of the main contributions of this work is identifying t…
Multi-parameter analysis of the obstacle scattering problem
2022
Abstract We consider the acoustic field scattered by a bounded impenetrable obstacle and we study its dependence upon a certain set of parameters. As usual, the problem is modeled by an exterior Dirichlet problem for the Helmholtz equation Δu + k 2 u = 0. We show that the solution u and its far field pattern u ∞ depend real analytically on the shape of the obstacle, the wave number k, and the Dirichlet datum. We also prove a similar result for the corresponding Dirichlet-to-Neumann map.
Comparing reference point based interactive multiobjective optimization methods without a human decision maker
2022
AbstractInteractive multiobjective optimization methods have proven promising in solving optimization problems with conflicting objectives since they iteratively incorporate preference information of a decision maker in the search for the most preferred solution. To find the appropriate interactive method for various needs involves analysis of the strengths and weaknesses. However, extensive analysis with human decision makers may be too costly and for that reason, we propose an artificial decision maker to compare a class of popular interactive multiobjective optimization methods, i.e., reference point based methods. Without involving any human decision makers, the artificial decision make…
Le tecniche investigative nel contrasto ai traffici di migranti, stupefacenti e sigarette
2019
The paper is aimed at analysing investigative techniques used in the fight against trafficking of migrants, drugs and tobaccos at national as well as at European level
Introduction: Definition and Legal Sources
2019
The aim of the contribution is to define the concept of international military operations to which the rules of humanitarian law apply. The work also offers a definition of the sending state and the host state of these operations. It also identifies the normative sources governing these phenomena: from international humanitarian law ("ius in bello") to human rights law, UN standards, the agreements on the status of the forces deployed, but also internal legal systems.
PSICOLOGÍA POSITIVA: ANÁLISIS DESDE SU SURGIMIENTO
2015
More than a decade since the foundation of Positive Psychology by Martin Seligman, this paper aims to analyze this branch of psychology starting at its very beginning, considering its precedents, its topics of interest, its production, its diffusion, its implications for clinical practice, and future research lines. Furthermore, this paper introduces a discussion regarding the future of Positive Psychology: either its dissolution, or its integration with the other fields of psychology.
Quantitative Runge Approximation and Inverse Problems
2017
In this short note we provide a quantitative version of the classical Runge approximation property for second order elliptic operators. This relies on quantitative unique continuation results and duality arguments. We show that these estimates are essentially optimal. As a model application we provide a new proof of the result from \cite{F07}, \cite{AK12} on stability for the Calder\'on problem with local data.
Central Region Upgrade for the Jyväskylä K130 Cyclotron
2020
The Jyväskylä K130 cyclotron has been in operation for more than 25 years providing beams from H to Au with energies ranging from 1 to 80 MeV/u for nuclear physics research and applications. At the typical energies around 5 MeV/u used for the nuclear physics program the injection voltage used is about 10 kV. The low voltage limits the beam intensity especially from the 18 GHz ECRIS HIISI. To increase the beam intensities the central region of the K130 cyclotron is being upgraded by increasing the injection voltage by a factor of 2. The new central region with spiral inflectors for harmonics 1-3 has been designed. The new central region shows better transmission in simulations than the origi…
La hubris manageriale quale fonte della irresponsabilità d’impresa: uno studio esplorativo
2014
Obiettivo del paper: L’ondata di scandali etici che ha colpito intensamente il mondo delle imprese a partire dalla fine del XX secolo ha fatto emergere l’esigenza di esplorare i meccanismi istituzionali tesi a evitare nuovi casi di corporate social irresponsibility (CSI). S’intende contribuire a tale dibattito introducendo la trappola della hubris manageriale quale determinante della CSI. Metodologia: Esame qualitativo-longitudinale del caso Parmalat nel periodo in cui è stata sotto la guida del suo fondatore Calisto Tanzi (1961-2003). L’analisi del caso segue i criteri scientifici del campionamento teorico, della triangolazione dei fatti e della periodizzazione della narrazione. Risultati:…