57 research outputs found
La exigencia en vía civil de las cuotas de las cámaras de comercio: un caso controvertido y aleccionador
Este breve examen de los diversos problemas planteados por la reclamación en vía civil de las cuotas de las Cámaras de Comercio pretende poner de manifiesto la importancia de un enjuiciamiento sistemático que tenga en cuenta todos los sectores del ordenamiento (constitucional, procesal, administrativo-tributario). Dicho enjuiciamiento sistemático es el único que puede evitar también los problemas derivados de actuaciones de reclamación y defensa que, en otro caso, podrían resultar insuficientes desde el punto de vista legal
El plan del censo de la provincia de Cádiz de Félix José reinoso (1823)
El objetivo de este trabajo es mostrar el plan del censo de la provincia de Cádiz, que en 1823 Félix José Reinoso presentó a la diputación provincial. Dicho plan es algo más que unas normas para la elaboración de un censo poblacional o de viviendas, ya que también propone la forma de efectuar estudios de morbilidad, mortalidad, epidemiales, educativos y económicos, así como la realización de censos electorales, en un tiempo en que dichas operaciones estadísticas no eran frecuentes. Especialmente interesante es la definición de población ocupada y desocupada masculina y las instrucciones que da para su cálculo
Analytical marginalisation over photometric redshift uncertainties in cosmic shear analyses
As the statistical power of imaging surveys grows, it is crucial to account
for all systematic uncertainties. This is normally done by constructing a model
of these uncertainties and then marginalizing over the additional model
parameters. The resulting high dimensionality of the total parameter spaces
makes inferring the cosmological parameters significantly more costly using
traditional Monte-Carlo sampling methods. A particularly relevant example is
the redshift distribution, , of the source samples, which may require
tens of parameters to describe fully. However, relatively tight priors can be
usually placed on these parameters through calibration of the associated
systematics. In this paper we show, quantitatively, that a linearisation of the
theoretical prediction with respect to these calibratable systematic parameters
allows us to analytically marginalise over these extra parameters, leading to a
factor reduction in the time needed for parameter inference, while
accurately recovering the same posterior distributions for the cosmological
parameters that would be obtained through a full numerical marginalisation over
160 parameters. We demonstrate that this is feasible not only with
current data and current achievable calibration priors but also for future
Stage-IV datasets.Comment: 11 pages, 8 figures, prepared for submission to MNRAS, comments
welcom
Analytical marginalization over photometric redshift uncertainties in cosmic shear analyses
As the statistical power of imaging surveys grows, it is crucial to account for all systematic uncertainties. This is normally done by constructing a model of these uncertainties and then marginalizing over the additional model parameters. The resulting high dimensionality of the total parameter spaces makes inferring the cosmological parameters significantly more costly using traditional Monte Carlo sampling methods. A particularly relevant example is the redshift distribution, p(z ), of the source samples, which may require tens of parameters to describe fully. However, relatively tight priors can be usually placed on these parameters through calibration of the associated systematics. In this paper, we show, quantitatively, that a linearization of the theoretical prediction with respect to these calibrated systematic parameters allows us to analytically marginalize over these extra parameters, leading to a factor of ∼30 reduction in the time needed for parameter inference, while accurately recovering the same posterior distributions for the cosmological parameters that would be obtained through a full numerical marginalization over 160 p(z ) parameters. We demonstrate that this is feasible not only with current data and current achievable calibration priors but also for future Stage-IV data sets
LimberJack.jl: auto-differentiable methods for angular power spectra analyses
We present LimberJack.jl, a fully auto-differentiable code for cosmological
analyses of 2 point auto- and cross-correlation measurements from galaxy
clustering, CMB lensing and weak lensing data written in Julia. Using Julia's
auto-differentiation ecosystem, LimberJack.jl can obtain gradients for its
outputs up to an order of magnitude faster than traditional finite difference
methods. This makes LimberJack.jl greatly synergistic with gradient-based
sampling methods, such as Hamiltonian Monte Carlo, capable of efficiently
exploring parameter spaces with hundreds of dimensions. We first prove
LimberJack.jl's reliability by reanalysing the DES Y1 32-point data. We
then showcase its capabilities by using a O(100) parameters Gaussian Process to
reconstruct the cosmic growth from a combination of DES Y1 galaxy clustering
and weak lensing data, eBOSS QSO's, CMB lensing and redshift-space distortions.
Our Gaussian process reconstruction of the growth factor is statistically
consistent with the CDM Planck 2018 prediction at all redshifts.
Moreover, we show that the addition of RSD data is extremely beneficial to this
type of analysis, reducing the uncertainty in the reconstructed growth factor
by on average across redshift. LimberJack.jl is a fully open-source
project available on Julia's general repository of packages and GitHub.Comment: Prepared for OJA. Fixed minor typos. Comments welcomed
Towards the construction of the digital citizenship. New models of participation and empowerment through Internet
Este trabajo aborda la cuestión de la participación digital de los ciudadanos en las cuestiones públicas como una forma de empoderamiento. Además trata de identificar los factores que favorecen dicha participación. Metodológicamente se han recogido los datos a partir de una encuesta a 1183 usuarios de Internet a los que se ha aplicado un análisis de regresión lineal múltiple. Los resultados muestran que para la mitad de la población existe la percepción de que las prácticas digitales en la Red sí empoderan, aunque con matices y que la ciudadanía confía más en la acción colectiva con los pares que en la utilidad que puedan tener sus acciones respecto a las instituciones públicas. Además se observa una considerable participación ciudadana en los asuntos públicos a través de Internet, especialmente entre aquellos que muestran estar más alfabetizados digitalmente y tienen mayores expectativas respecto a esas acciones.This paper focuses on digital participation of citizens in public affairs, as a way of citizen empowerment, and try to identify the factors that promote such participation. Methodologically, data were collected from a survey to 1183 Internet users, and applying a multiple linear regression analysis. The results show that about half of the population perceive that digital practices in the Network empower themselves, but with some nuances. On the other hand, citizens have more confidence in collective action with others like them that in the utility their actions may have with respect to public institutions. In addition a significant citizen participation in public affairs is observed through the Internet, especially among those who prove to be more digitally alphabetized and have higher expectations for these actions.Fac. de Ciencias de la InformaciónTRUEMinisterio de Economía y Competitividad. Ref. CSO2012-30756pu
+Digital citizenship: youth activism on e-petitions platforms
Este trabajo aborda el tema de la participación solidaria de la juventud a través de la firma de e-peticiones en plataformas online. A partir de un cuestionario de elaboración propia a 463 estudiantes universitarios de ambos sexos, se ha tratado de ver si la firma de e-peticiones es una práctica generalizada o no entre las/os jóvenes, cuáles son las motivaciones a la hora de firmar y si se trata de un comportamiento de clickactivismo o hay una implicación más comprometida. Los resultados muestran que la firma de e-peticiones es una forma de participación social bastante extendida, sin diferencias en cuanto a género, aunque las/os jóvenes no se identifican plenamente con ella. Se muestran idealistas y altruistas a la hora de firmar, aunque desconfían de que tenga mucha repercusión social y sirva para cambiar la realidad. La proximidad psicológica y emocional de las causas que firman es lo que les motiva a apoyar unas causas u otras. El perfil de estos/as jóvenes que firman e-peticiones se caracteriza por una autopercepción de personas más comprometidas socialmente que los que no suelen firmar, con un posicionamiento ideológico algo más a la izquierda y por canalizar su activismo social principalmente a través de la Red.This work addresses the issue of youth solidarity participation through the signing of e-petitions on online platforms. From a questionnaire of own elaboration to 463 university students of both sexes, it has been tried to prove if the signing of e-petitions is a generalized practice or not among young people, what are the motivations when they sign the e-petitions and if it is a clickactivism behavior or there is a more committed involvement. The results show that e-petition signing is a widespread form of social participation, with no gender differences, although young people do not fully identify with it. They are idealistic and altruistic when they sign, although they doubt that it has a lot of social repercussion and serves to change the world. The psychological and emotional proximity of the causes they sign is what motivates them to support some causes or others. The profile of these young people who sign e-petitions is characterized by a self-perception of more socially committed than those who do not usually sign, with a more left-wing ideological tendency and for exhibiting their social activism mainly through the Internet.Unidad Deptal. de Sociología: Metodología y TeoríaFac. de Ciencias de la InformaciónTRUEpu
VETTONIA PROJECT: A VIRTUAL ENVIRONMENT FOR THE EDUCATIONAL DISSEMINATION OF THE IRON AGE
The VETTONIA project aims to disseminate the rich heritage from the Iron Age of the western Iberian Peninsula and the archaeological investigations carried out on this topic in recent years. The project utilizes new technologies such as virtual tours, 3D models, and impressions to create interactive and stimulating ways to access the results of the most recent archaeological research. Using these resources, lectures and seminars are being given in various forums with diverse types of audiences to present the virtual tours and the rest of the dissemination initiatives. In addition, the project presents its different initiatives during the annual archaeological interventions developed in the oppidum of Ulaca (Solosancho, Ávila, Spain), with good reception by the attending public. The VETTONIA project represents a pioneering dissemination experience that takes advantage of the educational opportunities offered by new technologies. In the future, tools such as virtual tours to archaeological sites may prove essential in classroom teaching at different levels and could promote sustainable tourism in fragile natural environments such as those that constitute the major settlements of the Late Iron Age (ca. 400–50 BC)
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