Harmonic mappings and conformal minimal immersions of Riemann surfaces into RN

We prove that for any open Riemann surface N, natural number N ≥ 3, non-constant harmonic map h:N→R N−2 and holomorphic 2-form H on N , there exists a weakly complete harmonic map X=(Xj)j=1,…,\scN:N→R\scN with Hopf differential H and (Xj)j=3,…,\scN=h. In particular, there exists a complete conformal minimal immersion Y=(Yj)j=1,…,\scN:N→R\scN such that (Yj)j=3,…,\scN=h . As some consequences of these results (1) there exist complete full non-decomposable minimal surfaces with arbitrary conformal structure and whose generalized Gauss map is non-degenerate and fails to intersect N hyperplanes of CP\scN−1 in general position. (2) There exist complete non-proper embedded minimal surfaces in R\scN, ∀\scN>3.Ministerio de Ciencia y Tecnología MTM2007-61775Ministerio de Ciencia y Tecnología MTM2007-64504Junta de Andalucía P09-FQM-508

Complete minimal surfaces and harmonic functions

We prove that for any open Riemann surface N and any non constant harmonic function h : N → R, there exists a complete conformal minimal immersion X : N → R3 whose third coordinate function coincides with h. As a consequence, completeminimal surfaceswith arbitrary conformal structure andwhose Gauss map misses two points are constructed.Ministerio de Educación y Ciencia MTM2007-61775Ministerio de Educación y Ciencia MTM2007-64504Junta de Andalucía P06-FQM-01642

The Ford Foundation, Psychometric Experts, and the Dissemination of Aptitude Testing for College Admission in Latin America during the Cold War

This report reconstructs the largely unexplored development of a Latin American network of psychometric experts during the Cold War, which was promoted, funded, and organized by private non-profit US-American organizations, such as the Ford Foundation, the Educational Testing Service, and the College Board. The establishment of this network enabled the dissemination of psychometric knowledge and technologies, and the introduction of the Scholastic Aptitude Test (SAT) as a college admissions test in several Latin American countries. The dissemination mechanisms of these bodies included the organization of a Workshop in Test Construction for Foreign Scholars, training instances on educational measurement and testing offered in Princeton, New Jersey, to scholars from developing countries; the establishment of testing dissemination centers in South and Central America; and the institution of a Latin American branch of the College Board in Puerto Rico. This dissemination and networking process was triggered and catalyzed by a global discourse coalition that defined a global crisis in higher education admissions due to the rapid expansion of primary and secondary education

Applying autonomy to distributed satellite systems: Trends, challenges, and future prospects

While monolithic satellite missions still pose significant advantages in terms of accuracy and operations, novel distributed architectures are promising improved flexibility, responsiveness, and adaptability to structural and functional changes. Large satellite swarms, opportunistic satellite networks or heterogeneous constellations hybridizing small-spacecraft nodes with highperformance satellites are becoming feasible and advantageous alternatives requiring the adoption of new operation paradigms that enhance their autonomy. While autonomy is a notion that is gaining acceptance in monolithic satellite missions, it can also be deemed an integral characteristic in Distributed Satellite Systems (DSS). In this context, this paper focuses on the motivations for system-level autonomy in DSS and justifies its need as an enabler of system qualities. Autonomy is also presented as a necessary feature to bring new distributed Earth observation functions (which require coordination and collaboration mechanisms) and to allow for novel structural functions (e.g., opportunistic coalitions, exchange of resources, or in-orbit data services). Mission Planning and Scheduling (MPS) frameworks are then presented as a key component to implement autonomous operations in satellite missions. An exhaustive knowledge classification explores the design aspects of MPS for DSS, and conceptually groups them into: components and organizational paradigms; problem modeling and representation; optimization techniques and metaheuristics; execution and runtime characteristics and the notions of tasks, resources, and constraints. This paper concludes by proposing future strands of work devoted to study the trade-offs of autonomy in large-scale, highly dynamic and heterogeneous networks through frameworks that consider some of the limitations of small spacecraft technologies.Postprint (author's final draft

Algunas consideraciones sobre el matrimonio putativo.

Material incluido en el volumen especial de la revista del Instituto Martín de Azpilcueta, Universidad de Navarra : Ius Canonicum (1999), en honor de Javier Hervada

Dificultades de la integración de los niños de etnia gitana en el sistema educativo: estudio de caso

En este trabajo se ha realizado una investigación con el propósito de saber cómo y de dónde provienen las dificultades de integración de los niños gitanos en lo que se refiere al sistema educativo y su propio entorno. Para ello se ha contrastado la información del marco teórico con los resultados obtenidos de 15 entrevistas hechas a los padres de dicha comunidad. Las edades de los niños cuyos padres fueron entrevistados van desde los 3 hasta los 12 años y en ninguno de esos casos parece haber discriminación, hecho que sí ocurre con algunos de los progenitores.Grado en Educación Infanti