4,927 research outputs found
Lectura crÃtica, una herramienta para mejorar el aprendizaje de las Ciencias
El pensamiento crÃtico es un aspecto crucial que todo ciudadano necesita para poder participar en una sociedad democrática y plural. La lectura, a clase de ciencias de artÃculos y textos de diferentes fuentes, asà como su comprensión crÃtica, puede ayudar a los estudiantes a desarrollar esta capacidad y potenciar la participación en el discurso social en relación a temáticas cientÃficas que los afectan directamente. Nuestro estudio, que se enmarca dentro del grupo de investigación de la UAB LIEC, se centra en promover la lectura crÃtica de textos de contenido cientÃfico de diferentes fuentes, y analizar como esta lectura favorece un aprendizaje de las ciencias relevante socialmente. En esta comunicación se presenta los resultados de aplicar una de estas actividades realizada a partir de la lectura crÃtica de un artÃculo de prensa sobre grafitis
¿Con qué criterios valora el profesorado la aplicación de un proyecto de innovación de fÃsica en contexto?
En este trabajo presentamos algunos de los criterios con los que el profesorado valora la aplicación de un proyecto de fÃsica en contexto, analizando su contribución al desarrollo de las capacidades recogidas en las finalidades y los objetivos del bachillerato y buscando identificar los puntos fuertes y los aspectos que habrÃa que revisar para orientar los posibles cambios a introducir para su mejora. Los resultados muestran, por una parte, que el proyecto interesa y se adapta al currÃculum y a las PAAU y es rico en actividades de enseñanza-aprendizaje, aunque no siempre se saben utilizar de manera eficiente y que, por otra, genera un proceso de formación en el profesorado que se valora como muy positivo y que comporta cambios profesionales más allá de la aplicación del proyecto
Research assessment under debate: disentangling the interest around the DORA declaration on Twitter
Much debate has been around the misapplication of metrics in research
assessment. As a result of this concern, the Declaration on Research Assessment
(DORA) was launched, an initiative that caused opposing viewpoints. However,
the discussion topics about DORA have not been formally identified, especially
in participatory environments outside the scholarly communication process, such
as social networks. This paper contributes to that end by analyzing 20,717
DORA-related tweets published from 2015 to 2022. The results show an increasing
volume of tweets, mainly promotional and informative, but with limited
participation of users, either commenting or engaging with the tweets,
generating a scarcely polarized conversation driven primarily by a few DORA
promoters. While a varied list of discussion topics is found (especially "Open
science and research assessment," "Academics career assessment & innovation,"
and "Journal Impact Factor"), the DORA debate appears as part of broader
conversations (research evaluation, open science). Further studies are needed
to check whether these results are restricted to Twitter or reveal more general
patterns. The findings might interest the different evaluators and evaluated
agents regarding their interests and concerns around the reforms in the
research evaluation
A Methodology for the Design of Robotic Hands with Multiple Fingers
This paper presents a methodology that has been applied for a design process of anthropomorphic hands with multiple fingers. Biomechanical characteristics of human hand have been analysed so that ergonomic and anthropometric aspects have been used as fundamental references for obtaining grasping mechanisms. A kinematic analysis has been proposed to define the requirements for designing grasping functions. Selection of materials and actuators has been discussed too. This topic has been based on previous experiences with prototypes that have been developed at the Laboratory of Robotics and Mechatronics (LARM) of the University of Cassino. An example of the application of the proposed method has been presented for the design of a first prototype of LARM Hand
Kadanoff-Baym approach to time-dependent quantum transport in AC and DC fields
We have developed a method based on the embedded Kadanoff-Baym equations to
study the time evolution of open and inhomogeneous systems. The equation of
motion for the Green's function on the Keldysh contour is solved using
different conserving many-body approximations for the self-energy. Our
formulation incorporates basic conservation laws, such as particle
conservation, and includes both initial correlations and initial embedding
effects, without restrictions on the time-dependence of the external driving
field. We present results for the time-dependent density, current and dipole
moment for a correlated tight binding chain connected to one-dimensional
non-interacting leads exposed to DC and AC biases of various forms. We find
that the self-consistent 2B and GW approximations are in extremely good
agreement with each other at all times, for the long-range interactions that we
consider. In the DC case we show that the oscillations in the transients can be
understood from interchain and lead-chain transitions in the system and find
that the dominant frequency corresponds to the HOMO-LUMO transition of the
central wire. For AC biases with odd inversion symmetry odd harmonics to high
harmonic order in the driving frequency are observed in the dipole moment,
whereas for asymmetric applied bias also even harmonics have considerable
intensity. In both cases we find that the HOMO-LUMO transition strongly mixes
with the harmonics leading to harmonic peaks with enhanced intensity at the
HOMO-LUMO transition energy.Comment: 16 pages, 9 figures. Submitted at "Progress in Nonequilibrium Green's
Functions IV" conferenc
Ceramica punica dal sito rurale di Truncu 'e Molas (Terralba, Sardegna)
No abstract available
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Responding to Climate Change: The Economy and Economics - Part of the Problem and Solution
The Climate Change Starter’s Guide provides an introduction and overview for education planners and practitioners on the wide range of issues relating to climate change and climate change education, including causes, impacts, mitigation and adaptation strategies, as well as some broad political and economic principles.
The aim of this guide is to serve as a starting point for mainstreaming climate change education into school curricula. It has been created to enable education planners and practitioners to understand the issues at hand, to review and analyse their relevance to particular national and local contexts, and to facilitate the development of education policies, curricula, programmes and lesson plans.
The guide covers four major thematic areas:
1. the science of climate change, which explains the causes and observed changes;
2. the social and human aspects of climate change including gender, health, migration, poverty and ethics;
3. policy responses to climate change including measures for mitigation and adaptation; and
4. education approaches including education for sustainable development, disaster reduction and sustainable lifestyles.
A selection of key resources in the form of publication titles or websites for further reading is provided after each of the thematic sections
A Nonperturbative Eliasson's Reducibility Theorem
This paper is concerned with discrete, one-dimensional Schr\"odinger
operators with real analytic potentials and one Diophantine frequency. Using
localization and duality we show that almost every point in the spectrum admits
a quasi-periodic Bloch wave if the potential is smaller than a certain constant
which does not depend on the precise Diophantine conditions. The associated
first-order system, a quasi-periodic skew-product, is shown to be reducible for
almost all values of the energy. This is a partial nonperturbative
generalization of a reducibility theorem by Eliasson. We also extend
nonperturbatively the genericity of Cantor spectrum for these Schr\"odinger
operators. Finally we prove that in our setting, Cantor spectrum implies the
existence of a -set of energies whose Schr\"odinger cocycle is not
reducible to constant coefficients
Finite elements and the discrete variable representation in nonequilibrium Green's function calculations. Atomic and molecular models
In this contribution, we discuss the finite-element discrete variable
representation (FE-DVR) of the nonequilibrium Green's function and its
implications on the description of strongly inhomogeneous quantum systems. In
detail, we show that the complementary features of FEs and the DVR allows for a
notably more efficient solution of the two-time Schwinger/Keldysh/Kadanoff-Baym
equations compared to a general basis approach. Particularly, the use of the
FE-DVR leads to an essential speedup in computing the self-energies.
As atomic and molecular examples we consider the He atom and the linear
version of H in one spatial dimension. For these closed-shell models we,
in Hartree-Fock and second Born approximation, compute the ground-state
properties and compare with the exact findings obtained from the solution of
the few-particle time-dependent Schr\"odinger equation.Comment: 12 pages, 3 figures, submitted as proceedings of conference "PNGF IV
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