117 research outputs found

    El festin de Baltasar [Texto impreso] : romance bíblico

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    Hay un ejemplar encuadernado con: Bandos divertidísimos contra los borrachos y borrachas, y gente aficionada al vino (NP849.91/3087)

    Better borrowers, fewer banks?

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    We investigate the relationship between borrower quality and the structure of the pool of banks. First, we develop a theoretical model where the size of the banking pool is a credible signal of firm quality. We argue that better borrowers seek to disclose their quality in a credible way through the structure of the banking pool involving fewer banks. Second, we test our prediction using a sample of more than 3,000 loans from 19 European countries. We perform regressions of the number of bank lenders on various proxies of borrower quality. Our empirical tests corroborate the theoretical redictions. The size of the banking pool is a signal of borrower quality. Hence, good quality firms have fewer lenders in their banking pools.Bank lending, borrower quality, multiple banking, number of lenders, signaling, Europe.

    New functional polymers for sensors, smart materials and solar cells

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    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2012.Vita. Cataloged from PDF version of thesis.Includes bibliographical references.Organic polymers can be used as the active component of sensors, smart materials, chemical-delivery systems and the active layer of solar cells. The rational design and modification of the chemical structure of polymers has enabled control over their properties and morphology, leading to the advancement of nanotechnology. A deeper understanding of structure-property relationships, as described in this thesis, affords control over the nanostructure of devices made from these macromolecular materials, which is crucial to the optimization of their performance. In Chapter 1, a new sensor for ionizing radiation based on composites of electron beam lithography resists, poly (olefin sulfone)s (POSs), and multiwalled carbon nanotubes is presented. The polymeric active component is radiation labile and its degradation after a sensing event leads to morphological and electrical changes in the composite at the nanoscale. As a result, a signal can be detected. Systematic sensitivity improvements can be accomplished by rational modifications of the chemical structure of the polymer side-chains. Orthogonal postpolymerization modifications performed using "click" chemistry, incorporate functional groups capable of increasing either the homogeneity of the composite, or its opacity towards radiation. In Chapter 2, a smart hybrid polymer composed of a POS and a silicone linked by "click" chemistry is described. By tuning the chemical structure of these two components and varying their ratio, composites with different mechanical properties and hardness can be achieved. This elastomeric smart material exhibits switchable mechanical properties: exposure to mild bases triggers disassembly into its monomers and individual constituents. In Chapter 3, the design, synthesis and properties of new polymer surfactant additives for photovoltaic devices is shown. The AB alternating regioregular polythiophene copolymer additives are obtained via a combinatorial approach, and contain functional groups in every other repeat unit. In Chapter 4 incorporation of small amounts of these polymer additives (0.25 weight %) is shown to result in large increases of up to 30% in the power conversion efficiency of organic solar cells consisting primarily of the benchmark system of poly (3-hexylthiophene) and Phenyl-C6 1-butyric acid methyl ester (PCBM) as the active layer. This effect is mainly due to the presence of dipoles at the interface of the bulk heterojunction introduced by the additives, which prevent charge recombination and lead to increases in the photocurrent collected across the polymer-fullerene interface. In Chapter 5, the synthesis of liquid crystalline polymer brushes is described, and their supramolecular and self-assembly properties are studied. The solid-state ordering and alignment properties of these highly substituted polymers can be affected by chemically tuning their mesogenic oligomeric side-chains, the length of the polymer backbone and the degree of crosslinking. The morphologies obtained with these macromolecules are interesting from the point of view of future photovoltaic applications.by Jose Miguel Lobez Comeras.Ph.D

    Inmigración y vivienda: determinantes en la compra de vivienda por los inmigrantes en España.

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    En primer lugar, se estudian las características de los inmigrantes que llegan a España según su origen desde los diferentes continentes. En segundo lugar, se estudia el tipo de acceso a la vivienda del inmigrante y su movilidad residencial. Finalmente, se analizan los factores que influyen en la propensión de los inmigrantes a la compra de vivienda en España a través de un modelo econométrico

    El triunfo del Ave María [Texto impreso] : romance histórico

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    Hay un ejemplar encuadernado con : Bandos divertidísimos contra los borrachos y borrachas, y gente aficionada al vino(NP849.91/3087)Hay un ejemplar encuadernado con: La aparición de la Santisima Virgen de la Saleta de los Alpes (NP849.91/2046).Hay un ejemplar encuadernado con: "Recuerdos de una familia católica / Ángel García de las Heras"(Carreres/4434

    Functionalized Poly(3-hexylthiophene)s via Lithium–Bromine Exchange

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    Poly(3-hexylthiophene) (P3HT) is one of the most extensively investigated conjugated polymers and has been employed as the active material in many devices including field-effect transistors, organic photovoltaics and sensors. As a result, methods to further tune the properties of P3HT are desirable for specific applications. Herein, we report a facile postpolymerization modification strategy to functionalize the 4-position of commercially available P3HT in two simple steps–bromination of the 4-position of P3HT (Br–P3HT) followed by lithium−bromine exchange and quenching with an electrophile. We achieved near quantitative lithium–bromine exchange with Br–P3HT, which requires over 100 thienyl lithiates to be present on a single polymer chain. The lithiated-P3HT is readily combined with functional electrophiles, resulting in P3HT derivatives with ketones, secondary alcohols, trimethylsilyl (TMS) group, fluorine, or an azide at the 4-position. We demonstrated that the azide-modified P3HT could undergo Cu-catalyzed or Cu-free click chemistry, significantly expanding the complexity of the structures that can be appended to P3HT using this method.National Science Foundation (U.S.) (ECCS-0939514

    La régulation bancaire dans l'Union économique et monétaire ouest-africaine est-elle efficace ?

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    International audienceThis paper investigates empirically the impact of bank regulation on the risk of default of WAEMU banks over the period 2000-2010. Our results suggest that banks which have relatively high capital ratios, those focusing on loans as well as large banks have a lower risk of default. However, WAEMU banks seem to finance riskier and more profitable assets to offset the extra cost of subordinated debt. Favorable macroeconomic conditions are factors reducing the risk of default while a high share of the financial sector in GDP increases this risk.Cette étude analyse empiriquement l’impact de la régulation bancaire sur le risque de défaillance des banques de l’UEMOA de 2000 à 2010. Nos résultats suggèrent que les banques qui ont des ratios de solvabilité élevés, celles qui se concentrent sur l’activité de crédit et les grandes banques ont un risque de défaillance plus faible. Cependant, les banques de l’UEMOA semblent financer des d’actifs plus risqués et plus rémunérateurs pour compenser le surcoût des dettes subordonnées. Des conditions macroéconomiques favorables sont un facteur de réduction du risque de défaillance tandis qu’une part relative du secteur financier dans le PIB plus élevée contribue à accroître ce risque

    Le tourisme dans le Boulonnais

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    Lobez Jean-Yves. Le tourisme dans le Boulonnais. In: Hommes et Terres du Nord, 1966/2. pp. 72-73

    Too big to fail : gouvernance et régulation des banques

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    “Too Big to Fail Effect” : How to Articulate Bank Governance and Regulation ? This article tries to answer these questions : What were the role and the effects of the governance of banks in the development of the crisis ? What lessons to learn from the systemic crisis to develop a new regulation, and how articulate this new regulation and bank governance ? We advocate a double analysis. The path of expansion of a bank usually results from a balance from conflicting interests between shareholders and depositors ; during the recent crisis, the emergence of the “ too big to fail argument” annihilated the disciplining effect of the “ bank runs”. This lead to an increase in bank risks. The main objectives of the banking regulation are the following : to provide incentives for banks to return to their fundamentals, to restore bankruptcy virtues, and to limit systemic risk. In this respect, several paths are discussed : the limitation of bank size, the creation of special bankruptcy framework for banks, the limitation of securitization and the principle of a regulation contingent to the governance of each bank. Classification JEL : G01, G21, G28.Cet article tente de répondre aux questions suivantes : Quels ont été le rôle et les effets de la gouvernance des banques dans le développement de la crise ? Quelles leçons tirer de la crise systémique pour situer les objectifs d’une régulation, et comment articuler gouvernance et régulation ? La thèse soutenue est double. Le sentier d’expansion d’une banque résulte usuellement d’un équilibre entre les effets antagonistes de la gouvernance des actionnaires et de celle des déposants ; dans la crise récente, l’émergence du too big to fail effect a annihilé l’effet disciplinant des «ruées bancaires » . Logiquement, il en est résulté un accroissement du risque porté par les banques. La régulation bancaire doit avoir pour principaux objectifs d’inciter les banques à revenir à leurs fondamentaux, de restaurer les vertus de la faillite et de limiter un risque systémique qui est nouveau et déstabilisant. Dans cette perspective, plusieurs pistes sont discutées : la limitation de la taille des banques, la création d’un régime spécial de faillite pour les banques, la limitation de la titrisation et le principe d’une régulation contingente à la gouvernance de la banque. Classification JEL : G01, G21, G28.Lobez Frédéric. Too big to fail : gouvernance et régulation des banques. In: Revue d'économie financière, n°100, 2010. Le risque systémique 1. Repenser la finance. pp. 187-199
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