123,315 research outputs found
Nuclei in the Cosmos III Third International Symposium on Nuclear Astrophysics
No full textproceedings book (615 pages) of the Nuclei in the Cosmos n. III symposium held in Assergi, L'Aquila, in 1994. M. Busso is the chairman of the organizing commitee and the first edito
Civil Society Actors and the Welfare State. A historically-based analytical framework
No full textCivil society actors have always been crucial players in the development of welfare systems. Far before the appearance of the welfare state, the provision of services to those in need was the domain of charities and guilds, and later on of the mutual aid organizations related to the labour movement. To-gether with providing services, civil society actors have exerted political pressure on the state, demanding an enlargement of social rights or challenging the principles of public intervention. Such a relevant role became even more pivotal after the '70s, when the welfare mix model paved the way for the entrance of third sector organizations into public service provision and governance processes. Within this scenario, this article aims to develop a historically-based conceptual framework, through which the huge heterogeneity of civil society actors and functions can be analyzed. The possibility of performing several roles represents an opportunity for civil society actors, but at the same times engenders contradictions and trade-offs for social movements and the third sector
Hacia el fortalecimiento de la economía popular en tiempos de pandemia
No full textLa pandemia se inició de manera intempestiva en gran parte del mundo a inicios del 2020. En Argentina se registró el primer caso de COVID-19 el 3 de marzo, y unos días después se decretó el estado de Aislamiento Social Preventivo y Obligatorio (ASPO), el cual rigió a partir del 20 de marzo de 2020 (Decreto N° 297/20). Las medidas de aislamiento se fueron renovando en el transcurso del año, dando lugar a partir del mes de junio al estado de Distanciamiento Social Preventivo y Obligatorio (DISPO) en diferentes regiones del país. Dicha situación sufrió sucesivos cambios a lo largo del 2020 y 2021, en función del comportamiento de las variables sanitarias. A pesar que el impacto económico fue evidente a lo largo de todo ese período, entre marzo y junio el aislamiento fue masivo, generando consecuencias devastadoras para gran parte de la población. Sin embargo, quienes no se encontraba protegidos por empleos registrados sufrieron las mayores pérdidas de puestos de trabajo, engrosando las filas de la desocupación y la inactividad, o en algunos casos sufriendo una baja en sus ingresos debido a la necesidad de reinventar sus actividades laborales .Fil: Gonzalez, Federico Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Humanidades y Ciencias Sociales. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales; ArgentinaFil: Busso, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Humanidades y Ciencias Sociales. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales; Argentin
On the production of heavy neutron-rich isotopes during He and C burning in massive stars
No full textThe main purpose of this lecture is a re-examination of the yields of
s-elements by massive short-lived stars. He-burning conditions are
reviewed and results are presented for the nucleosynthesis in this
phase. The authors briefly analyse the possibility of n-captures during
carbon burning and discuss the contribution of massive stars to the
enrichment of the interstellar medium in s-elements
Respuestas judiciales a la violencia de género: el derecho como discurso y práctica sociales
No full textFil: Sánchez Busso, Mariana N. Universidad Nacional de Córdoba. Facultad de Derecho; Argentina.Generalmente los estudios sobre el sistema jurídico entre los/las juristas, suelen limitarse al análisis normativo o jurisprudencial. Sin embargo, hace ya mucho tiempo que sabemos que comprender al Derecho requiere conocer sus significados, sus valores precedentes y también sus discursos y prácticas; esto es, entenderlo como un fenómeno social. Fenómeno social que implica y expresa mucho más que un conjunto de normas. Esta es una idea que no sólo proviene de la Sociología del Derecho, sino que las teorías jurídicas feministas han incorporada claramente. Es dentro de este marco teórico que, en sus relaciones con el género, el Derecho puede ser entendido como un discurso social que dota de sentido a las conductas de varones y mujeres, a la vez que opera como el gran legitimador del poder que se impone a través de las palabras de la ley. De forma que, la construcción social de los roles, las posiciones correspondientes y la relación de los géneros en sí, no pueden comprenderse cabalmente si no se considera la contribución que brindan a estos efectos no sólo las leyes, sino también las instituciones, los sistemas, y también los discursos y el hablar de los jueces a través de sus sentencias. Así, y dentro de este contexto de ideas, este trabajo se propone comprender y analizar cómo se construye y expresa desde la voz de los propios jueces, el fenómeno social de la violencia de género; sus discursos, sus conceptualizaciones, su legitimación; mediante el análisis de las propias sentencias en las que emiten su propia voz.Fil: Sánchez Busso, Mariana N. Universidad Nacional de Córdoba. Facultad de Derecho; Argentina.Otras Derech
The Be()Li reaction and the Cosmological Lithium Problem: measurement of the cross section in a wide energy range at n_TOF (CERN)
No full textWe report on the measurement of the Be()Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a key role in the lithium yield of the Big Bang Nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and showed a large discrepancy between each other. The measurement was performed with a Si-telescope, and a high-purity sample produced by implantation of a Be ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low-energy, relative to current evaluations, in the region of BBN interest the present results are consistent with the values inferred from the time-reversal Li()Be reaction, thus yielding only a relatively minor improvement on the so-called Cosmological Lithium Problem (CLiP). The relevance of these results on the near-threshold neutron production in the p+Li reaction is also discussed. ..
Review and new concepts for neutron-capture measurements of astrophysical interest
No full textThe idea of slow-neutron capture nucleosynthesis formulated in 1957 triggered a tremendous experimental effort in different laboratories worldwide to measure the relevant nuclear physics input quantities, namely () cross sections over the stellar temperature range (from few eV up to several hundred keV) for most of the isotopes involved from Fe up to Bi. A brief historical review focused on total energy detectors will be presented to illustrate how, advances in instrumentation have led, over the years, to the assessment and discovery of many new aspects of -process nucleosynthesis and to the progressive refinement of theoretical models of stellar evolution. A summary will be presented on current efforts to develop new detection concepts, such as the Total-Energy Detector with -ray imaging capability (i-TED). The latter is based on the simultaneous combination of Compton imaging with neutron time-of-flight (TOF) techniques, in order to achieve a superior level of sensitivity and selectivity in the measurement of stellar neutron capture rates...
Chemical evolution of the galactic halo. I - Effects of possible mass segregation mechanisms
No full textThe distribution of metals in globular clusters and in the stars of the
bulge component of the Galaxy are reproduced by means of galactic halo
chemical evolution models giving particular attention to the observed
Z(N) relation. Following Hartwick's (1976) demonstration that chemical
distributions of the type observed for population II stars can be
theoretically reproduced if mass is temporarily removed from the
star-forming regions, two alternative mass segregation mechanisms are
proposed to account for this phenomenon: the first being derived from
the different dynamical behavior of the gas and the stars, and the
second from consideration of a star formation law conditioned by the
ionization of early-type stars. Models based on simple schematizations
of the phenomena to which the two mass segregation mechanisms give rise,
as well as on an initial mass function allowing for high M/L ratios, are
found to reproduce observational data for both metal abundances and mass
distributions
Understanding n-capture nucleosynthesis - A test for stellar and galactic evolution
No full textTheoretical and experimental data are reviewed as they relate to stellar
n-capture nucleosynthesis and therefore to constraints on advanced
stellar evolution. Attention is given to the mechanisms of n-captures
occuring near the valley of beta-stability or with very strong neutron
fluxes under dynamical conditions. High-resolution spectroscopic data
and advances in nuclear theory are shown to be useful for constraining
the explosive stages of stellar evolution as well as the age of the
universe
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