Blurred Boundaries in Ambiguous Space

Publicación exhaustiva de la torre de VPO en Vallecas de entresitio. La revista Space tiene un comité de revisión y selección de artículos formado por arquitectos consagrados de prestigio internacional como son Peter Cook, Peter Eisenman y Arata Isozaki

Coalitional manipulations in a bankruptcy problem

In a bankruptcy problem framework we consider rules immune to possible manipulations by the creditors involved in the problem via merging or splitting of their individual claims. The paper provides characterization theorems for the non manipulable rules, the no advantageous merging parametric rules and the no advantageous splitting parametric rules.Publicad

Decreasing Serial Cost Sharing under Economies to Scale

We consider the problem of cost sharing in the presence of increasing returns to scale and potential strategic behavior on the part of consumers. We show that any smooth and strictly monotonic mechanism for which a Nash equilibrium exists for all profiles of convex and monotonic preferences must be dictatorial. However, we propose a cost sharing mechanism, the decreasing serial mechanism, for which an interesting domain restriction ensures existence of a noncooperative equilibrium for its cost sharing game. A characterization theorem of the mechanism based on the strategic properties of existence, uniqueness, and efficiency of its noncooperative equilibrium is provided.Publicad

English Language Minority Students and Education Policy: A Focus on the Latinx Population

Our federal government allows states to pass and ratify new laws every year. Over the last thirty years, America has experienced a polarized fight over the expansion or reduction of government involvement. In terms of education policy, local districts and governments can play an essential role in the implementation, evaluation, and development of equitable educational opportunities. This paper examines federal and state level policies in the context of English Language Learners’ (EL) educational opportunities. In particular, I focus on Mt. Diablo High School, which is located in the Mount Diablo District. According to the California State Department of Education, the percentage of English Language Learners at this school is 33.5%. Out of this percentage, a majority of English Language Learner students at Mt. Diablo High School are Latinx (84.98%). These statistics help to demonstrate that state and district level policies lack inclusivity, student awareness on academic resources, accessibility to career center programs, and a lack of parent and teacher participation. Due to these shortcomings, these policies primarily feed into the undereducation and retention of EL students. By analyzing existing Student Site Council meetings and state-level data sets, I argue that there is a higher need for accountability and support relative to the number of EL students attending Mt. Diablo High School

Revisión sistemática de Mesolecanium Cockerell de la región Neotropical (Hemiptera: Coccidae), con sinonimia y combinaciones nuevas

Redescriptions and illustrations of 14 neotropical species included in Mesolecanium Cockerell are given. Eight species: Mesolecanium baccharidis (Cockerell), Mesolecanium impar (Cockerell), Mesolecanium mayteni Hempel, Mesolecanium nocturnum (Cockerell and Parrott), Mesolecanium obscurum (Hempel), Mesolecanium obvius Granara de Willink, Mesolecanium perditum (Cockerell), and Mesolecanium planum Hempel, belong to this genus; a key to separate the species is given. Five species are transferred: Mesolecanium campomanesiae Hempel and Mesolecanium pseudosemen Cockerell are moved to Magnococcus Granara de Willink becoming Magnococcus campomanesiae (Hempel) new combination, and Magnococcus pseudosemen (Cockerell) new combination. Mesolecanium jaboticabae Hempel is moved to Parthenolecanium Šulc becoming Parthenolecanium jaboticabae (Hempel) new combination, Mesolecanium batatae Cockerell to Pulvinaria Targioni Tozzetti becoming Pulvinaria batatae (Cockerell) new combination, and Mesolecanium ferum Hempel to Toumeyella Cockerell becoming Toumeyella ferum (Hempel) new combination. Mesolecanium uvicola Hempel is a new synonym of Coccus longulus Cockerell. Lectotypes for Mesolecanium impar (Cockerell) and Mesolecanium planum Hempel are designated.Se redescriben e ilustran 14 especies neotropicales incluidas en Mesolecanium Cockerell (Hemiptera: Coccidae). Ocho especies: Mesolecanium baccharidis (Cockerell), Mesolecanium impar (Cockerell), Mesolecanium mayteni (Hempel), Mesolecanium nocturnum (Cockerell y Parrott), Mesolecanium obscurum Hempel, Mesolecanium obvius Granara de Willink, Mesolecanium perditum (Cockerell), Mesolecanium planum Hempel, pertenecen a este género, las cuales se incluyen en una clave para separar las mismas. Cinco especies son transferidas: Mesolecanium campomanesiae (Hempel) y Mesolecanium pseudosemen (Cockerell), se transfieren a Magnococcus Granara de Willink como Magnococcus campomanesiae (Hempel) comb. nov. Magnococcus pseudosemen (Cockerell) comb. nov. respectivamente; Mesolecanium jaboticabae (Hempel) se transfiere a Parthenolecanium Šulc, como Parthenolecanium jaboticabae (Hempel) comb. nov.; Mesolecanium batatae (Cockerell) a Pulvinaria Targioni Tozzetti como, Pulvinaria batatae (Cockerell) comb. nov. y Mesolecanium ferum Hempel a Toumeyella Cockerell como Toumeyella ferum (Hempel) comb. nov. Se sinonimisa a Mesolecanium uvicola Hempel con Coccus longulus (Douglas). Se designan los lectotipos de Mesolecanium impar (Cockerell) y Mesolecanium planum Hempel

Traffic Sign Recognition System

The research group CAOS at the Computing Department of the Carlos III University of Madrid, Spain, offers an efficient recognition system for traffic signs using a set of classifiers. This system can be used as part of an active security system in cars. The fact that the system is based on a set of classifiers facilitates a distributed implementation, resulting in cheaper hardware and an improvement in fault-tolerance.Contrato Programa de Comercialización e Internacionalización. Sistema Regional de Investigación Científica e Innovación Tecnológica. (Comunidad de Madrid; Universidad Carlos III de Madrid

Inappropriate use of proton-pump inhibitors and fragility fracture risk. A preliminary study

Introducción: Los inhibidores de la bomba de protones (IBP) son fármacos ampliamente utilizados, si bien esto conlleva a un sobreuso que no es acorde con las indicaciones aceptadas en España y en el resto de Europa. Por otro lado, algunos autores han establecido una posible implicación de los IBP en el riesgo de fractura. Con este trabajo hemos pretendido efectuar una primera aproximación al conocimiento del consumo de IBP en nuestro medio y analizar para qué indicación son prescritos, a la vez que estudiar su posible asociación con un mayor riesgo de fractura por fragilidad entre sus consumidores. Material y método: Estudio observacional, transversal, abierto, descriptivo, en el que se entrevistó aleatoriamente a un número de pacientes que fueron atendidos en diferentes ámbitos sanitarios: consultas externas hospitalarias, servicios de urgencias, consulta de Atención Primaria y pacientes ingresados en planta hospitalaria. Resultados: De los 411 pacientes entrevistados, el 54% de los pacientes recibían IBP, y cuya edad media era de 63,3 años, frente al 46% que no los tomaban y que eran más jóvenes, con una edad media de 50,9 años. La distribución por sexos fue similar. La principal razón de utilizar el IBP era como “protector gástrico”, en el 39,8% de los pacientes, indicación no existente en la ficha técnica de este grupo de fármacos. Los consumidores de IBP tenían una mayor prevalencia de todas las fracturas por fragilidad. Conclusiones: Más de la mitad de la población encuestada consume IBP, y de ella cerca del 40% sin una indicación médica correcta. Por esto, unido a la mayor prevalencia de fracturas por fragilidad que presentan –que nos hace pensar en un posible mayor riesgo de fractura entre sus usuarios– consideramos la necesidad de un uso más racional de estos fármacos. Estas conclusiones son preliminares pero, a la vista de estos resultados, creemos que puede ser interesante realizar más estudios dirigidos a comprobar de manera más firme la relación entre los IBP y el riesgo de fractura osteoporótica.Sociedad Canaria de Osteoporosi

High-order full discretization for anisotropic wave equations

Two-dimensional linear wave equation in anisotropic media, on a rectangular domain with initial conditions and periodic boundary conditions, is considered. The energy of the problem is contemplated. The space discretization is reached by means of finite differences on a uniform grid, paying attention to the mixed derivative of the equation. The discrete energy of the semi-discrete problem is introduced. For the time integration of the system of ordinary differential equations obtained, a fourth order exponential splitting method, which is a geometric integrator, is proposed. This time integrator is efficient and easy to implement. The stability condition for time step and space step ratio is deduced. Numerical experiments displaying the good behavior in the long time integration and the efficiency of the numerical solution are provided.MTM2015-66837-P del Ministerio de Economía y Competitivida

Trade disclosure and price dispersion

This paper determines the effects of post-trade opaqueness on market performance. We find that the degree of market transparency has important effects on market equilibria. In particular, we show that dealers operating in a transparent structure set regret-free prices at each period making zero expected profits in each of the two trading rounds, whereas in the opaque market dealers invest in acquiring information at the beginning of the trading day. Moreover, we obtain that if there is no trading activity in the first period, then market makers only change their quotes in the opaque market. Additionally, we show that trade disclosure increases the informational efficiency of transaction prices and reduces volatility. Finally, concerning welfare of market participants, we obtain ambiguous results