4,388 research outputs found
Embracing the future: embedding digital repositories in the University of London. Briefing paper
This briefing paper captures the key findings and recommendations of
a study commissioned by the Joint Information Systems Committee
(JISC) on aspects of the strategic commitment of institutions to
repository sustainability.1 This project, labelled EMBRACE (EMBedding
Repositories And Consortial Enhancement) is aimed at enhancing the
functionality, inter-operability and extensibility of the SHERPA-LEAP
repository service, which currently supports the repositories of
thirteen University of London institutions. This briefing paper aims to
clarify the different motivations to use and invest in digital
repositories, and potential ways to address the challenges to
embedding these repositories in institutional strategy and daily
operation are highlighted. It is designed for use by Higher Education
Institutions (HEIs), who are encouraged to adapt the recommendations
to their specific context
Creation of scalar and Dirac particles in the presence of a time varying electric field in an anisotropic Bianchi I universe
In this article we compute the density of scalar and Dirac particles created
by a cosmological anisotropic Bianchi type I universe in the presence of a time
varying electric field. We show that the particle distribution becomes thermal
when one neglects the electric interaction.Comment: 8 pages, REVTEX 3.0. to appear in Phys. Rev.
Embracing the future: embedding digital repositories in the University of London
Digital repositories can help Higher Education Institutions (HEIs) to develop coherent and coordinated approaches to capture, identify, store and retrieve intellectual assets such as datasets, course material and research papers. With the advances of technology, an increasing number of Higher Education Institutions are implementing digital repositories. The leadership of these institutions, however, has been concerned about the awareness of and commitment to repositories, and their sustainability in the future.
This study informs a consortium of thirteen London institutions with an assessment of current awareness and attitudes of stakeholders regarding digital repositories in three case study institutions. The report identifies drivers for, and barriers to, the embedding of digital repositories in institutional strategy. The findings therefore should be of use to decision-makers involved in the development of digital repositories. Our approach was entirely based on consultations with specific groups of stakeholders in three institutions through interviews with specific individuals.
The research in this report was prepared for the SHERPA-LEAP Consortium and conducted by RAND Europe
Sub-Doppler resonances in the back-scattered light from random porous media infused with Rb vapor
We report on the observation of sub-Doppler resonances on the back-scattered
light from a random porous glass medium with rubidium vapor filling its
interstices. The sub-Doppler spectral lines are the consequence of saturated
absorption where the incident laser beam saturates the atomic medium and the
back-scattered light probes it. Some specificities of the observed spectra
reflect the transient atomic evolution under confinement inside the pores.
Simplicity, robustness and potential miniaturization are appealing features of
this system as a spectroscopic reference.Comment: 6 pages, 4 figure
Creation of Dirac Particles in the Presence of a Constant Electric Field in an Anisotropic Bianchi I Universe
In this article we compute the density of Dirac particles created by a
cosmological anisotropic Bianchi I universe in the presence of a constant
electric field. We show that the particle distribution becomes thermal when one
neglects the electric interaction.Comment: 9 page
The peremptory influence of a uniform background for trapping neutral fermions with an inversely linear potential
The problem of neutral fermions subject to an inversely linear potential is
revisited. It is shown that an infinite set of bound-state solutions can be
found on the condition that the fermion is embedded in an additional uniform
background potential. An apparent paradox concerning the uncertainty principle
is solved by introducing the concept of effective Compton wavelength
Spectrum of the Relativistic Particles in Various Potentials
We extend the notion of Dirac oscillator in two dimensions, to construct a
set of potentials. These potentials becomes exactly and quasi-exactly solvable
potentials of non-relativistic quantum mechanics when they are transformed into
a Schr\"{o}dinger-like equation. For the exactly solvable potentials,
eigenvalues are calculated and eigenfunctions are given by confluent
hypergeometric functions. It is shown that, our formulation also leads to the
study of those potentials in the framework of the supersymmetric quantum
mechanics
Uso de animaciones para la enseñanza de algoritmos de búsqueda en Inteligencia Artificial
En este trabajo se describe el uso de una herramienta
gráfica de libre disposición y código abierto desarrollada
como apoyo en la enseñanza de algoritmos de
bĂşsqueda heurĂstica en Inteligencia Artificial (A*,
IDA* y bĂşsqueda frontera). Se pretende facilitar la
comprensiĂłn de los mismos y sus propiedades desde
una perspectiva activa y participativa por parte de
los alumnos, incrementando sus oportunidades para
la exploraciĂłn y el descubrimiento. La herramienta
permite editar cuadrĂculas con obstáculos y definir
nodos de inicio y fin. A continuaciĂłn se puede visualizar
paso a paso la ejecuciĂłn de diversas combinaciones
de algoritmos y heurĂsticos, asĂ como mostrar
datos relativos a su rendimiento. Esto permite desarrollar
una serie de prácticas y tareas amenas para el
alumnado, que a su vez evitan algunas dudas y malentendidos
frecuentes en el aprendizaje de esta materia.
La herramienta se emplea con Ă©xito desde el
curso académico 2007/2008 en la ETSI Informática
de la Universidad de Málaga.Peer Reviewe
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