67 research outputs found
Juventud y cooperativismo en el Paraguay
Resumen de ponencias, debate y conclusiones del Encuentro de Jóvenes Cooperativistas. Organizado por la Cooperativa San Cristóbal Ltda., Asunción, 26 de noviembre de 1994.Contenido
Presentación
1. Apertura 4.
1.1 Rodolfo Serafini. Cooperativa San Cristóbal. Comité de Educación 4.
1.2 Exposición del Sr. Julio López. Presidente del Comité de Educación y Vice Presidente de la Cooperativa San Cristóbal 4.
1.3 Exposición de Luis Caputo. BASE-IS. Programa de Juventud Rural 5.
1.4 Exposición de Fidel Agüero. Cooperativa Medalla Milagrosa 6.
1.5 Exposición de Fernando Ríos. Instituto Nacional de Cooperativismo 7.
1.6 Exposición de Enrique Riera. Viceministro de Educación 8.
2. La juventud Cooperativista: Su dimensión socio-política 11.
2.1 La juventud desde la óptica cooperativista 14.
2.2 Características ventajosas de la juventud 16.
3. Debate 18.
4. Plenaria y conclusiones. Participación de la juventud en la organización cooperativa 25.
4.1 Representantes del Grupo1. La situación actual del joven, con respecto a los obstáculos y a las oportunidades que encuentra el joven con respecto al cooperativismo 25.
4.2 Representantes del Grupo 2. La situación de la juventud en la cooperativa 28.
4.3 Representante del Grupo 3. Puntos sobre las principales causas de desempleo juvenil 31
Complexity and project management: a general overview
As projects have become more and more complex, there has been an increasing concern about the concept of project complexity.
An understanding of project complexity and how it might be managed is of significant importance for project managers because of the differences associated with decision-making and goal attainment that are related to complexity. Complexity influences project planning and control; it can hinder the clear identification of goals and objectives, it can affect the selection of an appropriate project organization form, or it can even affect project outcomes. Identifying the different concepts associated to project complexity, its main factors and characteristics, the different types of project complexity, and the main project complexity models, can be of great support in assisting the global project management community. In this paper, we give a general overview of how complexity has been investigated by the project management community and propose several ideas to address this topic in the future
J-PLUS: A wide-field multi-band study of the M15 globular cluster. Evidence of multiple stellar populations in the RGB
The Javalambre Photometric Local Universe Survey (J-PLUS) provides wide
field-of-view images in 12 narrow, intermediate and broad-band filters
optimized for stellar photometry. Here we have applied J-PLUS data for the
first time for the study of Galactic GCs using science verification data
obtained for the very metal-poor GC M\,15. Our J-PLUS data provide
low-resolution spectral energy distributions covering the near-UV to the
near-IR, allowing us to search for MPs based on pseudo-spectral fitting
diagnostics. J-PLUS CMDs are found to be particularly useful to search for
splits in the sequences formed by the upper red giant branch (RGB) and
asymptotic giant branch (AGB) stars. We interpret these split sequences as
evidence for the presence of MPs. This demonstrates that the J-PLUS survey will
have sufficient spatial coverage and spectral resolution to perform a large
statistical study of GCs through multi-band photometry in the coming years.Comment: 11 pages, 11 figures. Accepted for publication @ A&
Stellar populations of galaxies in the ALHAMBRA survey up to . II. Stellar content of quiescent galaxies within the dust-corrected stellar masscolour and the colourcolour diagrams
Our aim is to determine the distribution of stellar population parameters
(extinction, age, metallicity, and star formation rate) of quiescent galaxies
within the rest-frame stellar masscolour and colourcolour diagrams
corrected for extinction up to . These novel diagrams reduce the
contamination in samples of quiescent galaxies owing to dust-reddened galaxies,
and they provide useful constraints on stellar population parameters. We set
constraints on the stellar population parameters of quiescent galaxies
combining the ALHAMBRA multi-filter photo-spectra with our SED-fitting code
MUFFIT, making use of composite stellar population models. The extinction
obtained by MUFFIT allowed us to remove dusty star-forming (DSF) galaxies from
the sample of red galaxies. The distributions of stellar population
parameters across these rest-frame diagrams are revealed after the dust
correction and are fitted by the LOESS method to reduce uncertainty effects.
Quiescent galaxy samples defined via classical diagrams are typically
contaminated by a % fraction of DSF galaxies. A significant part of the
galaxies in the green valley are actually obscured star-forming galaxies
(%). Consequently, the transition of galaxies from the blue cloud to
the red sequence, and hence the related mechanisms for quenching, seems to be
much more efficient and faster than previously reported. The rest-frame stellar
masscolour and colourcolour diagrams are useful for constraining
the age, metallicity, extinction, and star formation rate of quiescent galaxies
by only their redshift, rest-frame colours, and/or stellar mass. Dust
correction plays an important role in understanding how quiescent galaxies are
distributed in these diagrams and is key to performing a pure selection of
quiescent galaxies via intrinsic colours.Comment: (37 pages, 29 figures, accepted for publication in A&A
Aplicaciones y seguridad en la implementación de competencias prácticas en entornos de gestión del aprendizaje
In this article, some improvements and contributions are introduced into two main features of the Learning Management Systems (LMSs). The first feature is the security and the authentication functionality, where we present a model that combines the traditional authentication based on username and password, with the authentication based on fingerprints. The second feature is the access to remote and virtual laboratories, where we present a middleware architecture that combines the duplicated services provided by both, the laboratories and the LMS, in order to facilitate their integration and to provide a unique access from the LMS to the remote and virtual laboratories.En este artículo exponemos algunas mejoras y aportaciones en dos aspectos de los sistemas de gestión de aprendizaje (LMS). El primer aspecto es la seguridad y la autenticación, donde presentamos una modalidad de combinar la autenticación tradicional de contraseña y nombre de usuario con la autenticación por la técnica biométrica de comparación de huellas dactilares. El segundo aspecto es una arquitectura middleware capaz de dar acceso desde los LMS a distintos laboratorios remotos y virtuales (online) de forma que, se evita la duplicación de los servicios proporcionados por ambas y se reutilizan los servicios proporcionados por los LMS en las sesiones prácticas
Aplicaciones y seguridad en la implementación de competencias prácticas en entornos de gestión del aprendizaje
J-PLUS: Detecting and studying extragalactic globular clusters -- the case of NGC 1023
Extragalactic globular clusters (GCs) are key objects for studying the
formation and evolution of galaxies. The arrival of wide-field surveys such as
the Javalambre Photometric Local Universe Survey (J-PLUS) offers new
possibilities for the study of GCs. Nevertheless, GCs are not detected a priori
by the data reduction pipeline of J-PLUS and, due to its pixel scale, the
standard techniques of GCs detection are challenged. To fill this gap, we
develop a semi-automatic pipeline to detect GCs in J-PLUS that can also be
adapted to similar surveys. As a case study, we use data from the S0 galaxy NGC
1023 and we also study the stellar population content of GC candidates in the
galaxy. To detect GCs, our methodology is based on Source Extractor and does
not require a previous filtering or modelling of the host galaxy. We study
colors and perform spectral energy distribution (SED) analysis on our final GC
candidate catalog to obtain stellar population parameters. In NGC 1023,
GCFinder identifies 523 GC candidates. We observe evidence of color bimodality
in a few broad-band colors but not on narrow-band colors. The SED analysis
reveals a clear metallicity bimodality and we observe that narrow-band filters
are very useful to constrain metallicities. We also identified a broad
age-metallicity relation as well as a wide metallicity distribution that are
evidence that NGC 1023 experienced accretion events in the past. It is the
first time this kind of study is performed with J-PLUS data. By detecting GC
candidates in wide-field images without modeling the light of the galaxy,
GCFinder becomes considerably faster, at a marginal loss of centrally-located
GC candidates of about 7 percent. As GCFinder is entirely based on Source
Extractor, it could be easily incorporated into automated software handling
wide-field surveys.Comment: 21 pages, 19 figures, submitted to A&
Inversion charge study in TMO hole-selective contact-based solar cells
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this article, we study the effect of the inversion charge ( Q inv ) in a solar cell based on the hole-selective characteristic of substoichiometric molybdenum oxide (MoO x ) and vanadium oxide (VO x ) deposited directly on n-type silicon. We measure the capacitance–voltage ( C – V ) curves of the solar cells at different frequencies and explain the results taking into account the variation of the space charge and the existence of Q inv in the c-Si inverted region. The high-frequency capacitance measurements follow the Schottky metal–semiconductor theory, pointing to a low inversion charge influence in these measurements. However, for frequencies lower than 20 kHz, an increase in the capacitance is observed, which we relate to the contribution of the inversion charge. In addition, applying the metal–semiconductor theory to the high-frequency measurements, we have obtained the built-in voltage potential and show new evidence about the nature of the conduction process in this structure. This article provides a better understanding of the transition metal oxide/n-type crystalline silicon heterocontact.The authors would like to acknowledge the CAI de Técnicas
Físicas of the Universidad Complutense de Madrid. The authors
would also like to thank the Mexican grants program CONACyT
for its financial collaboration.Peer ReviewedPostprint (author's final draft
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