204 research outputs found
Undecidability as solution to the problem of measurement: fundamental criterion for the production of events
In recent papers we put forth a new interpretation of quantum mechanics,
colloquially known as ``the Montevideo interpretation''. This interpretation is
based on taking into account fundamental limits that gravity imposes on the
measurement process. As a consequence one has that situations develop where a
reduction process is undecidable from an evolution operator. When such a
situation is achieved, an event has taken place. In this paper we sharpen the
definition of when and how events occur, more precisely we give sufficient
conditions for the occurrence of events. We probe the new definition in an
example. In particular we show that the concept of undecidability used is not
``FAPP'' (for all practical purposes), but fundamental.Comment: 10 pages, contributed to the Castagnino Festschrif
A realist interpretation of quantum mechanics based on undecidability due to gravity
We summarize several recent developments suggesting that solving the problem
of time in quantum gravity leads to a solution of the measurement problem in
quantum mechanics. This approach has been informally called "the Montevideo
interpretation". In particular we discuss why definitions in this approach are
not "for all practical purposes" (fapp) and how the problem of outcomes is
resolved.Comment: 7 pages, IOPAMS style, no figures, contributed to the proceedings of
DICE 2010, Castiglioncello, slightly improved versio
Aprendizaje basado en problemas en Biología Vegetal
El aprendizaje basado en problemas (ABP) es un método de enseñanzaaprendizaje
que usa el problema como punto de partida para la adquisición e
integración de nuevos conocimientos. En el desarrollo del ABP el problema es el
camino para que los estudiantes alcancen los objetivos de conocimientos,
destrezas y habilidades. El ABP y el estudio de casos se centran en el estudiante
lo cual implica necesariamente un cambio de función en el profesor que deja de
ser protagonista para convertirse en una guía o en tutor. El tutor plantea
problemas y cuestiones que contribuyen al entendimiento y a la resolución de
problemas promoviendo de esta forma un aprendizaje significativo. Por otra
parte, las nuevas tecnologías de la información y la comunicación introducen
cambios importantes en el proceso de enseñanza-aprendizaje en base a lo
siguiente: a) el acceso a la información y el modo de adquirir información, b) las
nuevas formas de relación profesor-alumno. Este trabajo muestra algunas
experiencias para el desarrollo de ABP, el estudio de casos y la elaboración de
mapas conceptuales e infografías, experiencias realizadas en el aula con
estudiantes de Biología de la Universidad Complutense de Madrid y en relación
con dos campos de la Biología: la Fisiología Vegetal y la Biología Evolutiva.The problem-based learning (PBL) is a teaching-learning method that uses
the problem as a starting point for the acquisition and integration of new
knowledge. In the development of PBL the problem is the way to achieve the
knowledge, skills and abilities. Problem-based learning and case study focuses
on the student and therefore imply a change in the teacher role: from protagonist
to tutor or guide. A tutor offers questions that contribute to understanding and
managing the problem promoting meaningful learning. On the other hand,
information and communication technologies introduces important changes in
teaching and learning on the basis of two issues: a) access and how to acquire
information, b) new forms of teacher-student relationship. This work shows
some experiences for the development of PBL, case studies and concept mapping
as classroom experiences for Biological Sciences students at the Complutense
University of Madrid. Two biological sciences fields were considered: plant
physiology and evolutionary plant biology
Contribution of autochthonous maize populations for adaptation to European conditions
Early vigor, earliness and cold tolerance are the main potential contributions of European maize (Zea mays L.) for breeding programs for adaptation to areas with short growing seasons and cold springs. The objective of this research was to determine the potential contributions of populations from different European regions to breeding for adaptation. Six Spanish and six French maize populations differing on variability for earliness, vigor and cold tolerance were crossed in a complete diallel without reciprocals. The populations and their crosses were evaluated in the field and in a cold chamber. Minimum temperatures were the main environmental trait affecting genotype × environment interaction, probably due to the cold sensitivity of the genotypes with the best performance in the field. The best population cross, based on specific heterosis for adaptation-related traits in the field, was Viana × Rastrojero, but this cross was cold sensitive. Tuy × Lazcano should be the best choice for a breeding program for adaptation, based on performance in the field and cold tolerance. As conclusions, there was variability for earliness, vigor and cold tolerance among the populations and crosses involved in this study, being tolerant to cold conditions the populations with medium growing cycle originated in areas with short growing seasons. The highest yielding crosses were cold sensitive.Research supported by the Ministry
of Science and Technology (Ref. HF1999-0138), the Ministère de l’Education Nationale et de la Recherche, the
Committee for Science and Technology of Spain (Project
AGL2004-06776), the Autonomous government of Galicia
(PGIDIT04RAG403006PR), the Excma. Diputación Provincial
de Pontevedra, and the European Union (RESGEN
88 CT96).Peer reviewe
FIR-detected Lyman break galaxies at z ~ 3: Dust attenuation and dust correction factors at high redshift
Lyman break galaxies (LBGs) represent one of the kinds of star-forming
galaxies that are found in the high-redshift universe. The detection of LBGs in
the FIR domain can provide very important clues on their dust attenuation and
total SFR, allowing a more detailed study than those performed so far. In this
work we explore the FIR emission of a sample of 16 LBGs at z ~ 3 in the
GOODS-North and GOODS-South fields that are individually detected in PACS-100um
or PACS-160um. These detections demonstrate the possibility of measuring the
dust emission of LBGs at high redshift. We find that PACS-detected LBGs at z ~
3 are highly obscured galaxies which belong to the Ultra luminous IR galaxies
or Hyper luminous IR galaxies class. Their total SFR cannot be recovered with
the dust attenuation factors obtained from their UV continuum slope or their
SED-derived dust attenuation employing Bruzual & Charlot (2003) templates. Both
methods underestimate the results for most of the galaxies. Comparing with a
sample of PACS-detected LBGs at z ~ 1 we find evidences that the FIR emission
of LBGs might have changed with redshift in the sense that the dustiest LBGs
found at z ~ 3 have more prominent FIR emission, are dustier for a given UV
slope, and have higher SFR for a given stellar mass than the dustiest LBGs
found at z ~ 1.Comment: Accepted for publication in A&A letter
Un nuevo concepto de la gastronomía desde la bioeconomía y la actividad académica
El proyecto “Ciencia y arte en gastronomía: botánica gastronómica y
gastronomía molecular” se está desarrollando con el objetivo de establecer y
organizar el intercambio de conocimientos y negocio en este ámbito. Con este
objetivo se pretende aunar el conocimiento científico con la salud y el bienestar
social desde la perspectiva bioeconómica promoviendo la creación de riqueza y
trabajo. El proyecto forma parte de los cursos especializados que la Universidad
Complutense de Madrid oferta con el animo de incrementar el conocimiento y
desarrollar competencias personales y profesionales. El programa responde a la
demanda social proporcionando una formación con inmediata proyección
profesional mediante el establecimiento de un nexo directo entre la actividad
académica y la realidad social.Universidad de Sevilla. Cristalografía, Mineralogía y Química Agrícola
The project "Science and art in gastronomy: gastronomic botany and
molecular gastronomy" is being developed with the aim to establish and organize
the exchange of knowledge and business in this area. In this way we are working
to join the scientific knowledge to the health and the social well-being, without
losing the current perspective from the bioeconomy which look forward the generation of wealth and work. The project belongs to specialized courses
offered by The Complutense University of Madrid which aim is to update the
knowledge and develop personal and professional competitions. These programs
answer to a social demand on providing formation with professional immediate
projection establishing a direct relation between the academic activity and the
social reality
A morphological study of galaxies in ZwCl0024+1652, a galaxy cluster at redshift z ∼ 0.4
ABSTRACT: he well-known cluster of galaxies ZwCl0024+1652 at z ∼ 0.4 lacks an in-depth morphological classification of its central region. While previous studies provide a visual classification of a patched area, we used the public code called galaxy Support Vector Machine GALSVM)
and HST/ACS data as well as the WFP2 master catalogue to automatically classify all cluster members up to 1 Mpc. GALSVM analyses galaxy morphologies through support vector machine
(SVM). From the 231 cluster galaxies, we classified 97 as early types (ETs) and 83 as late types (LTs). The remaining 51 stayed unclassified (or undecided). By cross-matching our results with the existing visual classification, we found an agreement of 81 per cent. In addition to previous Zwcl0024 morphological classifications, 121 of our galaxies were classified for the first time in this work. In addition, we tested the location of classified galaxies on the standard morphological diagrams, colour–colour and colour–magnitude diagrams. Out of all cluster members, ∼20 per cent are emission-line galaxies, taking into account previous GLACE
results. We have verified that the ET fraction is slightly higher near the cluster core and decreases with the clustercentric distance, while the opposite trend has been observed for LT galaxies. We found a higher fraction of ETs (54 per cent) than LTs (46 per cent) throughout the analysed central region, as expected. In addition, we analysed the correlation between the five morphological parameters (Abraham concentration, Bershady–Concelice concentration, asymmetry, Gini, and M20 moment of light) and the clustercentric distance, without finding a clear trend. Finally, as a result of our work, the morphological catalogue of 231 galaxies
containing all the measured parameters and the final classification is available in the electronic form of this paper.MP also acknowledges support from the Spanish MINECO under projects AYA2013-42227-P and AYA2016-76682-C3-1-P- This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under the grants AYA2014-58861-C3-2-P, AYA2014-58861-C3-3-P, AYA2017-88007-C3-1-P, and AYA2017-88007-C3-2-P
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