Fair School Placement

This paper introduces &tao;-fairness as a compromise solution reconciling Pareto efficiency and equity in School Choice Problems. We show that, by considering a weak notion of equity that we refer to as ¿-equity, it is possible to contribute positively to solve an open debate, originated by the efficiency-equity trade-off of the schooling problem. We also suggest a slight modification to some allocative procedures recently introduced in the United States to compute ¿-fair allocations and provide support for this (possible) reformulation.School Choice Problem, Fair Matching

Hiring procedures to implement stable allocations

We implement the core correspondence in Subgame Perfect Equilibrium using a simplesequential mechanism in which firms propose a salary to each worker (in the first stage). Then ,each worker accepts at most one proposal (second stage). Moreover, we show that, if agents'preferences are additive, this mechanism implements in Subgame Perfect Equilibrium that firms'optimal correspondence when firms employ undominated strategies. Finally we construct anothersimple sequential mechanism to implement workers' optimal correspondence when agents'preferences are additive.Job matching markets, implementation, mechanism design

Hiring procedures to implement stable allocations

Altres ajuts: DGCYT/PB 92-0590Altres ajuts: DGCYT/PB 94-1504We implement the stable correspondence of a job matching market in Subgame Perfect Equilibrium. We use a simple sequential mechanism in which firms propose a salary to each worker (first stage) and, then, each worker accepts at most one proposal (second stage). Moreover, if agents' preferences are additive, this mechanism implements in Subgame Perfect Equilibrium the firms' optimal correspondence when firms use undominated strategies. Finally, we construct another simple sequential mechanism where the order of decisions is permuted and which implements the workers' optimal correspondence when agents' preferences are additive

Pigouvian taxes: A strategic approach

This paper analyzes the problem of designing mechanisms to implement efficient solutions in economies with externalities. We provide two simple mechanisms implementing the Pigouvian Social Choice Correspondence in environments in which coalitions can be formed. Finally, we study economies in which agents are incompletely informed, and provide a mechanism that implements this social choice correspondence in Bayesian equilibrium.Pigouvian taxes, mechanism design, implementation

A new prospect of additivity in bankruptcy problems

As it is known, there is no rule satisfying Additivity on the complete domain of bankruptcy problems. This paper proposes a notion of partial Additivity in this context, to be called µ-Additivity. We find that µ-Additivity, together with two quite compelling axioms, Anonymity and Continuity, identify the Minimal Overlap rule, introduced by O'Neill (1982).bankruptcy problems, additivity, minimal overlap rule.

Simple mechanisms to implement the core of college admissions problems

This paper provides three simple mechanisms to implement allocations in the core of matching markets. We analyze some sequential mechanisms which mimic matching procedures for many-to-one real life matching markets. We show that only core allocations should be attained when agents act strategically faced with these mechanisms. Two mechanisms implement the core correspondence in SPE, whereas the third implements the students' optimal stable solution.College admissions problems, mechanism design

Enfermedades oportunistas en pacientes con sida en Pinar del Río

Las personas infectadas por el Virus de la Inmunodeficiencia Humana (VIH) y que desarrollan el Síndrome de Inmunodeficiencia Adquirida (SIDA) son vulnerables a infecciones o neoplasias que se denominan oportunistas, ya que aprovechan para manifestarse la oportunidad que les brinda un sistema inmunitario debilitado. Existen diversos tratamientos y profilaxis, algunos sencillos y baratos, otros extremadamente caros y complejos, para contrarrestar la incidencia de dichas patologías. En muchas partes del mundo los sistemas asistenciales y la financiación son insuficientes para garantizar su aplicación universal, a diferencia de nuestro país. En el presente trabajo se logra caracterizar las principales enfermedades provocadas por microorganismos oportunistas en los pacientes con SIDA de la provincia de Pinar del Río. Pudo apreciarse como estas coinciden con las descritas en la literatura nacional e internacional. Se manifiestan como las más frecuentes: la candidiasis, la tuberculosis, la neumonía por Pneumocystis jirovecii (PCP) y las enfermedades diarreicas de etiología parasitaria

Impact of the rotavirus vaccine in Valladolid, Spain: An interrupted time series analysis

Producción CientíficaRotavirus vaccines (RV) have decreased the infant morbidity and mortality in countries that included RV in their national schedule. Rotavirus vaccination is recommended by the Spanish Society of Pediatrics; however, Spain, as most countries in Europe, has authorized commercialization but not included RV in its national vaccination program. We assessed the impact of RV on the rotavirus hospitalization rate through an interrupted time series analysis. There was a 46.8% (95% CI: 29.3–60.2) decrease on the rotavirus hospitalizations rate in the study region after RV commercialization in 2006. Currently there is limited evidence about the impact of RV in Europe, especially among countries not offering systematic vaccination in their national schedule. Documentation of RV coverage, effectiveness and impact is urgently needed in these countries

Soft X-rays spectroscopy with a commercial CMOS image sensor at room temperature

Besides their application in point and shoot cameras, webcams, and cell phones, it has been shown that CMOS image sensors (CIS) can be used for dosimetry, X-ray and neutron imaging applications. In this work we will discuss the application of an ON Semiconductor MT9M001 CIS, in low energy X-ray spectroscopy. The device is a monochromatic front-side illuminated sensor, very popular in consumer electronics. In this work we introduce the configuration selected for the mentioned sensor, the image processing techniques and event selection criteria, implemented in order to measure the X-ray energy in the range from 1-10 keV. Several fluorescence lines of different samples have been resolved, and for first time the line resolution have been measured and analyzed. We achieved a FWHM of 232 eV at 6.4 keV, and we concluded that incomplete charge collection (ICC) of the charge produced by the X-ray contributes to the resolution, being this effect more important at higher X-ray energies. The results analyzed in this work indicate that the mentioned CIS are specially suitable for X-ray applications in which energy and spatial resolutions are simultaneously required.Fil: Sofo Haro, Miguel Francisco. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Alcalde Bessia, Fabricio Pablo. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Pérez, Martín. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Blostein, Juan Jeronimo. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Balmaceda, Darío Federico. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Gomez Berisso, Mariano. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Lipovetzky, José. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentin

Investigación de la policromía original en la bóveda de la sala capitular de la casa consistorial de Sevilla

Dentro del Proyecto I+D BIA2004-07237 concedido en el Plan Nacional 2004 se están estudiando diversos edificios, uno de ellos la Casa Consistorial, y en concreto la bóveda de su espacio más singular, la Sala Capitular. Las trazas originales son del Arquitecto Diego de Riaño, de 1527. La Sala Capitular baja, de planta ligeramente rectangular está cubierta por una bóveda de piedra calcarenita en carpanel, muy rebajada, formada con nervaduras que definen una retícula ortogonal. Los treinta y seis casetones resultantes están decorados con relieves de monarcas castellanos y leoneses, reinantes entre 866 y 1556. Próximamente se va a restaurar, motivo por el cual se está estudiando la sala en su integridad, presentando en esta comunicación los resultados de los estudios preliminares de la policromía que ornamenta la bóveda. La piedra originariamente estuvo policromada. Se ha realizado un estudio histórico, iconográfico y experimental. Los resultados de las técnicas empleadas y la composición de los materiales se sintetizan en los siguientes apartados, tratándose principalmente de dorados, verdes, azules, negros y una veladura de protección