Now showing items 1444-1463 of 1733

    Radiación ultravioleta y sequía: efectos sobre la fisiología y la descomposición de hojarasca de especies arbustivas mediterráneas en el contexto del cambio climático 

    Rodríguez Hidalgo, Claudia Marina (Date of defense: 2020-09-09)

    Various climatic models predict an increase in the ultraviolet (UV) radiation and a reduction in the precipitation levels reaching in the Mediterranean Basin. Exposure of plants to different levels of UV radiation and water ...

    Ramon de Cornet: l'autor, l'obra i la circulació manuscrita 

    Navàs Farré, Marina (Date of defense: 2019-07-11)

    This study intends to offer a comprehensive analysis of Ramon de Cornet’s poetic and historical profile, his works and his manuscript tradition. He is the most important 14th-century Occitan poet, the author of a vast ...

    Ramon Esquerra (1909-1938?) : geografia vital i crítica d'un esperit comparatista 

    Molla Rodríguez, Guillem (Date of defense: 2010-07-12)

    La intenció d'aquesta tesi ha estat analitzar la dimensió biogràfica i crítica de Ramon Esquerra (1909-1938?). Es pretén arribar a la seva teoria a través de la seva pràctica, reconstruir el pensament global d'Esquerra a ...

    Ramon Martí d'Eixalà: un exponent de l'Escola Jurídica Catalana del segle XIX 

    Valls Salada, Judit, 1981- (Date of defense: 2010-04-27)

    L'objectiu d'aquesta tesi doctoral és analitzar el llegat jurídic de Ramon Martí d'Eixalà, especialment els seus manuals de dret mercantil i dret civil. En aquest sentit, cal recordar que Ramon Martí d'Eixalà va viure en ...

    Rational design of bioinspired iron and manganese catalysts for the effective and selective epoxidation of alkenes and oxidation of alkanes 

    Clarasó Petit, Carlota (Date of defense: 2019-02-08)

    Metalloenzymes are a fundamental source of inspiration for synthetic chemists. Oxidation metalloenzymes catalyze oxidation reactions with high efficiency under very mild experimental conditions exhibiting exquisite regio- ...

    Reaccions de cicloaddició [2+2+2] catalitzades per Rh(I) 

    Garcia López, Lídia (Date of defense: 2012-02-24)

    The development of new chemical processes and efficient catalysts for the formation of carbon-carbon bonds is an important topic in organic chemistry. In particular, the [2+2+2] cycloaddition reaction involving different ...

    Reaction mechanisms involved in cross coupling processes catalysed by copper and nickel 

    Rovira Coll, Mireia (Date of defense: 2017-03-10)

    Organometallic aryl-CuIII species have been proposed as key intermediates in Ullmann-type reactions. However, such species have long remained elusive and mechanistic investigations of a plausible catalytic cycle remained ...

    Reactivity of fullerenes, endohedral metallofullerenes, and nanotubes, and their possible application in solar energy conversion 

    Martínez López, Juan Pablo (Date of defense: 2016-11-18)

    The physical and chemical properties of fullerenes and nanotubes can be conveniently tuned by the attachment of different functional groups to them. Therefore, the systematic understanding of different problems such as ...

    Reactivity of well-defined organometallic copper(III) complexes in carbon-heteroatom bond forming reactions 

    Casitas Montero, Alícia (Date of defense: 2012-06-01)

    This thesis is focused on the unexplored field of organometallic copper(III) chemistry. Arylcopper(III) complexes have been proposed as key intermediates in Ullmann condensation reactions that consist in the coupling of ...

    Realistic urban layout modeling from real data 

    Pueyo Vallet, Oriol (Date of defense: 2016-01-15)

    Computer Graphics applications community has big interest on urban modeling and especially on designing complex and realistic cities and buildings. This topic is interesting for film, video game and urbanism industries. ...

    Recerca sobre les persones amb discapacitat psíquica contractades a l'Administració de la Generalitat de Catalunya. Anàlisi de la incidència de la inserció laboral en diferents dimensions de la vida dels treballadors amb discapacitat psíquica 

    Rius Bonjoch, Maria (Date of defense: 2005-12-02)

    L'activitat professional és fonamental en la vida de qualsevol persona i en el cas de les persones amb discapacitat resulta molt potent per tal que assumeixin la identitat adulta. Per això, en la tesi es realitza una ...

    Recursos per promoure la salut i el benestar de les persones amb malaltia pulmonar obstructiva crònica 

    Puigvert Vilalta, Margarita (Date of defense: 2015-07-13)

    The World Health Organization in 2002, recognized that self-care was the cornerstone in the care of people with chronic diseases. The management of chronic disease requires time, and it is complex and difficult. Self-care ...

    Redefining tourism destination boundaries from a consumption-based perspective 

    Paulino Valldepérez, Isabel (Date of defense: 2020-07-31)

    Tourism destinations usually follow the administrative boundaries of the corresponding territorial administration. In contrast, previous studies state that administrative boundaries are not the most effective framework ...

    Redes sociales de apoyo personal en jóvenes con discapacidad intelectual. Una comparativa entre redes de jóvenes con y sin discapacidad intelectual 

    Rey Freire, Ana (Date of defense: 2022-12-09)

    Interpersonal relationships, understood as desired and meaningful relationships for people and the basis of their social network, stand out as a factor that significantly influences the processes of social inclusion in ...

    Redes transfronterizas en turismo 

    Zizaldra Hernández, Isabel (Date of defense: 2009-12-11)

    Para el logro de un desarrollo sano es de vital importancia contar con un equilibrio económico en los diferentes rubros de la actividad productiva de las ciudades hermanas (CJS- ELP) y no sólo concretarse al ámbito de la ...

    Reducció de vibracions residuals en moviments transitoris. Definició de lleis de moviment per mitjà de corbes B-spline 

    Veciana, Joaquim M. (Joaquim Maria) (Date of defense: 2007-11-14)

    Molts sistemes mecànics existents tenen un comportament vibratori funcionalment perceptible, que es posa de manifest enfront d'excitacions transitòries. Normalment, les vibracions generades segueixen presents després del ...

    Reducción de barreras de adopción de criptomonedas: innovación tecnológica en los procesos de validación de transacciones 

    Carrillo Peña, Paulo Nicolás (Date of defense: 2019-07-10)

    This research proposes a solution for the reduction of part of the aforementioned barriers, through the design of the consensus protocol called Proof of Reputation (PoR) that is based on the Blockchain technology of Ethereum, ...

    Reduced density matrices: development and chemical applications 

    Rodríguez Mayorga, Mauricio (Date of defense: 2018-07-24)

    In this thesis, we focused on the alternative methodologies that are based on the reconstruction of density matrices. While in DFT several benchmarks can be found in the literature, for the rest of alternative methodologies ...

    Reformulation of constraint models into SMT 

    Palahí i Sitges, Miquel (Date of defense: 2015-12-10)

    In this thesis we focus on reformulate constraint satisfaction problems (CSP) into SAT Modulo Theories (SMT). SMT is an extension of SAT where the literals appearing in the formulas are not restricted to contain only ...

    Regulation and function of silayltransferases in pancreatic cancer 

    Bassagañas i Puigdemont, Sònia (Date of defense: 2014-12-03)

    Changes in the expression of Lewis-type glycan antigens, especially a predominance of sialyl-Lewis x (SLex) structure, and the glycosyltransferases involved in its synthesis, correlate with pancreatic cancer invasive and ...