A redistricting problem applied to meter reading in power distribution networks

The capacitated redistricting problem (CRP) has the objective to redefine, under a given criterion, an initial set of districts of an urban area represented by a geographic network. Each node in the network has different types of demands and each district has a limited capacity. Real-world applications consider more than one criteria in the design of the districts, leading to a multicriteria CRP (MCRP). Examples are found in political districting, sales design, street sweeping, garbage collection and mail delivery. This work addresses the MCRP applied to power meter reading and two criteria are considered: compactness and homogeneity of districts. The proposed solution framework is based on a greedy randomized adaptive search procedure and multicriteria scalarization techniques to approximate the Pareto frontier. The computational experiments show the effectiveness of the method for a set of randomly generated networks and for a real-world network extracted from the city of São Paulo. © 2013 Elsevier Ltd.

Pedagogia pentecostal: quando a igreja age em espaços que o poder público ignora

Pós-graduação em Educação - FCT

Sazonalidade e as redes de interações planta-polinizador

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

The Integration of the Glutamatergic and the White Matter Hypotheses of Schizophrenia's Etiology

Background: schizophrenia's endophenotipic profile is not only generally complex, but often varies from case to case. The perspective of trying to define specific anatomic correlates of the syndrome has led to disappointing results. In that context, neurophysiologic hypotheses (e. g. glutamatergic hypothesis) and connectivity hypotheses became prominent. Nevertheless, despite their commitment to the principle of denying 'localist' views and approaching the syndrome's endophenotype from a whole brain perspective, efforts to integrate both have not flourished at this moment in time. Objectives: This paper aims to introduce a new etiological model that integrates the glutamatergic and the WM (WM) hypotheses of schizophrenia's etiology. This model proposes to serve as a framework in order to relate to patterns of brain abnormalities from the onset of the syndrome to stages of advanced chronification. Highlights: Neurotransmitter abnormalities forego noticeable WM abnormalities. The former, chiefly represented by NMDAR hypo-function and associated molecular cascades, is related to the first signs of cell loss. This process is both directly and indirectly integrated to the underpinning of WM structural abnormalities; not only is the excess of glutamate toxic to the WM, but its disruption is associated to the expression of known genetic risk factors (e. g., NRG-1). A second level of the model develops the idea that abnormal neurotransmission within specific neural populations ('motifs') impair particular cognitive abilities, while subsequent WM structural abnormalities impair the integration of brain functions and multimodality. As a result of this two-stage dynamic, the affected individual progresses from experiencing specific cognitive and psychological deficits, to a condition of cognitive and existential fragmentation, linked to hardly reversible decreases in psychosocial functioning.

Disseminazioni in reti peer-to-peer attraverso algoritmi di gossip a due fasi

Gli algoritmi di gossip sono utilizzati per la disseminazione di messaggi in una rete peer-to-peer. La tesi tratta lo sviluppo, l'implementazione e l'analisi di quattro nuovi algoritmi di gossip "a due fasi". Gli algoritmi sono stati sviluppati e testati con il simulatore LUNES per poi essere analizzati in vari confronti con gli algoritmi classici dell'ambito, ovvero Fixed Probability e Conditional Broadcast. Le prove sono state effettuate su varie tipologie di grafi, ovvero Random, Scale-free, Small-world e K-Regular.

Effect of the porous structure in carbon materials for CO2 capture at atmospheric and high-pressure

Activated carbons prepared from petroleum pitch and using KOH as activating agent exhibit an excellent behavior in CO2 capture both at atmospheric (∼168 mg CO2/g at 298 K) and high pressure (∼1500 mg CO2/g at 298 K and 4.5 MPa). However, an exhaustive evaluation of the adsorption process shows that the optimum carbon structure, in terms of adsorption capacity, depends on the final application. Whereas narrow micropores (pores below 0.6 nm) govern the sorption behavior at 0.1 MPa, large micropores/small mesopores (pores below 2.0–3.0 nm) govern the sorption behavior at high pressure (4.5 MPa). Consequently, an optimum sorbent exhibiting a high working capacity for high pressure applications, e.g., pressure-swing adsorption units, will require a poorly-developed narrow microporous structure together with a highly-developed wide microporous and small mesoporous network. The appropriate design of the preparation conditions gives rise to carbon materials with an extremely high delivery capacity ∼1388 mg CO2/g between 4.5 MPa and 0.1 MPa. Consequently, this study provides guidelines for the design of carbon materials with an improved ability to remove carbon dioxide from the environment at atmospheric and high pressure.

Tomaso's fortune /

Short stories.

On Graph-Based Cryptography and Symbolic Computations

We have been investigating the cryptographical properties of in nite families of simple graphs of large girth with the special colouring of vertices during the last 10 years. Such families can be used for the development of cryptographical algorithms (on symmetric or public key modes) and turbocodes in error correction theory. Only few families of simple graphs of large unbounded girth and arbitrarily large degree are known. The paper is devoted to the more general theory of directed graphs of large girth and their cryptographical applications. It contains new explicit algebraic constructions of in finite families of such graphs. We show that they can be used for the implementation of secure and very fast symmetric encryption algorithms. The symbolic computations technique allow us to create a public key mode for the encryption scheme based on algebraic graphs.

Modelos de modernización para el desarrollismo: el influjo de las propuestas estadounidenses en el Servicio de Extensión Agraria (1955-1975)

Con este trabajo nos proponemos estudiar las políticas agrarias del franquismo y particularmente la creación y actuación del Servicio de Extensión Agraria (1955) en el contexto de la difusión de la Teoría de la Modernización. Comenzaremos con una contextualización de las relaciones culturales entre España y los EE.UU. y su potencial proyección sobre el ámbito rural. A continuación, prestaremos atención a la impronta del modelo extensionista norteamericano en la organización y metodología del Servicio de Extensión Agraria. Sin perder de vista la importancia de la escala estatal para la implementación y adaptación de las distintas políticas agrarias, atenderemos al contexto político e ideológico internacional como elemento que permite ampliar la comprensión y estudio de dichas políticas. En ese sentido, propondremos finalmente una primera aproximación comparativa al estudio del SEA en relación con diferentes experiencias de extensionismo agrario en Latinoamérica.

CONCERNS REGARDING THE PROTECTION OF COPYRIGHT IN THE INTERNET

The advent of the World Network(Net) Internet and the use of the technology in the digital environment raised new challenges to the author's copyright. These worries were considered in the last international agreements, so that the warning is not true of those who postulate that the Internet is a " territory of nobody ", where the works are unprotected completely. To educate on the topic of the protection of the author's copyright and to provide with resources the instances(authorities) in charge of the observance of these rights looks like an ineluctable task.

INTERNET Y LA GEOGRAFÍA

 Los geógrafos ahora tienen a su disposición la red mundial de INTERNET. Esta res es mucho más que un depósito gigante de datos y programas. Es un cúmulo de experiencias humanas que incluyen texto, artículos, imagen,  video y foros de discusión. Es una nueva forma de procesamiento a la información de formas que antes considerábamos imposibles. El profesional que continúe procesando y obteniendo información de la manera tradicional se estará quedando al margen de nuevo conocimiento disponible a diario en INTERNET. El profesional de hoy no se limita a recopilar información en una biblioteca o librería, sino que accesa directamente sitios de búsqueda que le permitirán encontrar rápidamente los datos que busca. Un ejemplo, son los meteorólogos que tienen en INTERNET su mejor herramienta, ya que pueden recuperar imágenes sobre el clima casi inmediatamente después que son almacenadas desde el satélite, lo cual les permite evaluar y discernir sobre el estado actual del clima (Aberdeen University Compiting Center, 1996). Las imágenes las pueden ver y bajar a su computadora individual para su propio uso. Los profesores en la actualidad brindan al estudiante todo su material almacenándolo en INTERNET. La relación profesor-estudiante ya no es la misma. Al estudiante se le exige encontrar la información en su computadora y asimilarla. El viejo cuaderno no es necesario, las lecciones pueden ser recuperadas para su estudio sin que el profesor tenga que impartirlas, como se hace en la mayoría de las universidades de los Estados Unidos (Ohio State University, 1996). En general, este articulo persigue mostrar a los profesionales de las ciencias geográficas, dónde encontrar la información que buscan t cómo localizar más de lo que imaginan con la red INTERNET.  ABSTRACT Geographers now have at their disposition the world network of INTERNET. This network is much more than just a large deposit of digital data and programs. It is an accumulation of human experiences that include text, articles, images, videos, and discussion bulletin boards. It is a new form of processing and managing information that was previously considered impossible. The professional who continues searching and obtaining information by traditional methods will be left on the fringes of this new wave of digital information and material available daily on INTERNET. Hence, a professional is not limited to compiling information in libraries or bookstores as direct and rapid access of desired research materials is available on the INTERNET. For example, meteorologists have in INTERNET their best tool in that they can acquire meteorologic satellite images, which permit them to evaluate and discern the actual present climatic situation (Aberdeen University Computing Center, 1996). One can see and then down load to one´s personal computer imagines of interest for personal use. Professors can offer to students all their materials for a class through and stores on the INTERNET. The relationship between professor and student is not the same. Students can be asked to access and assimilate the information via individual computers connected to the INTERNTET. Notebooks are becoming obsolete given that all class lectures and materials could be placed on the INTERNET for review without a professor having to give a lecture, as is being done in many universities of the United States (Ohio State University, 1996).This article pursues showing, in general, where professionals in Geographical Sciences can find available information and much more on the INTERNET.

Too Big to Ignore: Global Partnership on Small-Scale Fisheries Research - the Latin America and Caribbean network

Too Big to Ignore (TBTI; www.toobigtoignore.net) is a research network and knowledge mobilization partnership established to elevate the profile of small-scale fisheries (SSF), to argue against their marginalization in national and international policies, and to develop research and governance capacity to address global fisheries challenges. Network participants and partners are conducting global and comparative analyses, as well as in-depth studies of SSF in the context of local complexity and dynamics, along with a thorough examination of governance challenges, to encourage careful consideration of this sector in local, regional and global policy arenas. Comprising 15 partners and 62 researchers from 27 countries, TBTI conducts activities in five regions of the world. In Latin America and the Caribbean (LAC) region, we are taking a participative approach to investigate and promote stewardship and self-governance in SSF, seeking best practices and success stories that could be replicated elsewhere. As well, the region will focus to promote sustainable livelihoods of coastal communities. Key activities include workshops and stakeholder meetings, facilitation of policy dialogue and networking, as well as assessing local capacity needs and training. Currently, LAC members are putting together publications that examine key issues concerning SSF in the region and best practices, with a first focus on ecosystem stewardship. Other planned deliverables include comparative analysis, a regional profile on the top research issues on SSF, and a synthesis of SSF knowledge in LAC

Co-Authorship of scientists in the energy field: an exploratory study of the ETDE World Energy Database (ETDEWEB) using Social Network Analysis

Paper presented at the 5th European Conference Economics and Management of Energy in Industry, Vilamoura, Algarve. Apr. 14-17, 2009, 11p. URL: http:// www.cenertec.pt/ecemei/

Co-Authorship of scientists in the energy field: a study of the ETDE World Energy Database (ETDEWEB) using social network analysis

Dissertação apresentada como requisito parcial para obtenção do grau de Mestre em Gestão de Informação