Search results for " PRIN"

Heisenberg Uncertainty Relation in Quantum Liouville Equation

2009

We consider the quantum Liouville equation and give a characterization of the solutions which satisfy the Heisenberg uncertainty relation. We analyze three cases. Initially we consider a particular solution of the quantum Liouville equation: the Wigner transformf(x,v,t) of a generic solutionψ(x;t) of the Schrödinger equation. We give a representation ofψ(x,t) by the Hermite functions. We show that the values of the variances ofxandvcalculated by using the Wigner functionf(x,v,t) coincide, respectively, with the variances of position operatorX^and conjugate momentum operatorP^obtained using the wave functionψ(x,t). Then we consider the Fourier transform of the density matrixρ(z,y,t) =ψ∗(z,t)…

La Carta Social Europea y los derechos sociales emergentes: una aproximación al derecho de acceso a la información ambiental

2021

La protección de los derechos sociales constituye, hoy en día, un fin primordial, y en Europa, la Carta Social Europea Revisada juega un papel relevante como guardiana del modelo del Estado social, como verdadera Constitución Social de Europa y como el estándar de protección más elevado de los derechos sociales, en general, y de los derechos sociales emergentes, en particular. Así, resulta de especial interés estudiar el derecho de acceso a la información ambiental como derecho social emergente derivado, en gran parte, del genérico derecho a un medio ambiente sano. Este derecho se puede definir, en términos muy simples, como el derecho del público en general a recibir información relacionad…

El reconocimiento de las diferencias en los modelos de integración

2012

Este trabajo toma como punto de partida los modelos de configuración jurídica de las diferencias de Luigi Ferrajoli. Se extrapola dicha clasificación a la sistematización de los modelos de integración realizada por Javier De Lucas, concluyendo que los modelos de reconocimiento de las diferencias sirven como referente de análisis y evaluación de las políticas que establecen modelos de integración para las personas migrantes. En nuestro Estado Constitucional, entender la igualdad como el respeto y valoración de las diferencias (modelo 4), es una prescripción, un deber ser, que coexiste con los otros modelos, que aún no han sido superados completamente.

Design principles for learning analytics information systems in higher education

2020

This paper reports a design science research (DSR) study that develops, demonstrates and evaluates a set of design principles for information systems (IS) that utilise learning analytics to support learning and teaching in higher education. The initial set of design principles is created from theory-inspired conceptualisation based on the literature, and they are evaluated and revised through a DSR process of demonstration and evaluation. We evaluated the developed artefact in four courses with a total enrolment of 1,173 students. The developed design principles for learning analytics information systems (LAIS) to establish a foundation for further development and implementation of learning…

Commodity Tax Competition and Industry Location Under the Destination- and the Origin-Principle

2007

We develop a model of commodity tax competition with monopolistically competitive internationally mobile firms, transport costs, and asymmetric country sizes. We investigate the impacts of non-cooperative tax setting, as well as of tax harmonization and changes in the tax principle, in both the short and the long run. The origin principle, when compared to the destination principle, is shown to exacerbate tax competition and to erode tax revenues, yet leads to a more equal spatial distribution of economic activity. This suggests that federations which care about spatial inequality, like the European Union, face a non-trivial choice for their tax principle that goes beyond the standard consi…

Cargo-Cult Containerization : A Critical View of Containers in Modern Software Development

2022

Software is increasingly developed and deployed using containers. While the concept of a container is conceptually straightforward, there are various issues to be considered while using them, ranging from technical details inside containers to the orchestration of containers that jointly form a meaningful application. In recent years, the use of containers has become so prevalent that developers have a tendency to resort to cargo-cult containerization - ritual adherence to the use of containers just because so many others are doing the same thing. In this paper, we study advantages and downsides of containers in modern-day software development. We foresee the use of containers to spread int…

XRF analysis to identify historical photographic processes: The case of some Interguglielmi Jr.’s images from the Palermo Municipal Archive

2017

Abstract In the early period, even though professional photographers worked with similar techniques and products, their artistic and commercial aims determined different choices and led them to follow different, often personal, recipes. For this reason, identification of the techniques through date and name of the photographer or through some visual features like colour, tonality and surface of the image layer, often needs further investigation to be proved. Chemical characterization, carried out in a non or micro destructive way, can be crucial to provide useful information about the original composition, degradation process, realization technique, in obtaining an indirect dating of the ph…

In che senso la dialettica può essere non violenta

2010

Defect interaction and local structural distortions in Mg-doped LaGaO3: A combined experimental and theoretical study

2017

A combined experimental and theoretical study of Mg-doped LaGaO3 electrolyte was carried out, with the aim to unveil the interaction between oxygen vacancy (Vo) and perovskite B site cations. LaGaO3 (LG) and LaGa0.875Mg0.125O2.938 (LGM0125) samples were comprehensively characterized by X-ray absorption spectroscopy (XAS) and X-ray diffraction, in order to investigate short- and long-range structures of both undoped and Mg-doped materials. XAS analysis evidenced a preferential Ga-Vo interaction in LGM0125, confirmed by periodic hybrid density functional theory calculations, which were combined with a symmetry-independent classes (SICs) approach in order to (a) obtain a detailed picture of th…

An experimental methodology to study polymer crystallization under processing conditions. The influence of high cooling rates

2002

Abstract A new experimental route for investigating polymer crystallization under very high cooling rates (up to 2000°C/s) is described. A complete and exhaustive description of the apparatus employed for preparing thin quenched samples (100– 200 μm thick) is reported, the cooling mechanism and the temperature distribution across sample thickness is also analysed, showing that the final structure is determined only by the thermal history imposed by the fast quench apparatus. Details concerning the characterization techniques used to probe the final structure are reported, including density measurements and wide angle X-ray diffraction patterns. Experimental results concerning isotactic poly…