12,452 research outputs found

    Cup of Tea

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    “Such a beautiful photograph,” she marvels As she sits down where I used to lie. You look at the picture as she asks you who I am. For what seems like an eternity in your mind You plead with God to help you mask the clouds That are now thundering about in your head. “Just an old friend,” you reply coolly, After an uncomfortable second. ~ poem excerpt

    A (re)presentación de Galiza na obra de Fialho de Almeida

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    A finais do século XIX e principios do XX funcionan dúas imaxes sobre Galiza e os galegos en Portugal: unha negativa, asociada ao fenómeno migratorio, e outra de afinidade, baseada nos vínculos históricos, lingüísticos e culturais entre os dous lados do río Miño. O obxectivo desta disertación de mestrado é demostrar que estas dúas imaxes están presentes na obra de Fialho de Almeida e, asemade, analizar como o escritor alentexano vai evolucionando da imaxe negativa á de afinidade a medida que coñece a realidade galega.Between the end of the XIX century and the beginning of the XX century, two images of Galicia and of the Galicians circulated in Portugal. The first image is a negative one, as it is associated with migration phenomena. The second is one of affinity, based on the existing historic, linguistic and cultural ties on both sides of Minho. This MA dissertation aims at demonstrating that both images are present in the works of Fialho de Almeida, while analyzing how the writer born in the Alentejo evolves from a negative impression of Galicia and its people until one of affinityas he gets to know the region more profoundly

    The corporate social initiatives. Les iniciatives socials corporatives

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    Treballs Finals del Doble Grau d'Administració i Direcció d'Empreses i de Dret, Facultat d'Economia i Empresa i Facultat de Dret, Universitat de Barcelona. Curs: 2022-2023. Tutor:Cristina Roy PérezIn recent decades, public and institutional concern about environmental degradation and social sensitivity in business development have been on the rise. Consequently, many companies are carrying out social initiatives aimed at the community in which they are located. In order to understand how this corporate social commitment can and should be managed, this paper analyses the concepts of social action, CSR and sustainability in which these initiatives are usually framed, and the forms of patronage and sponsorship in which they are legally instrumentalised. The analysis reveals the need for a dialogue with the community to understand their expectations and integrate them into the corporate strategy. For figuring out this dialogue, a quantitative research has been conducted. Based on research and theoretical and legal analysis, the integration of CSR and sustainability and the use of theconvenio de colaboración - a figure of patronage - is the most appropriate strategy for the implementation of social initiatives

    Perovskite as a High-Energy radiation detector

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    Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutors: Federico Sánchez , Lluís GarridoThis project is mainly focused on extracting interesting properties of the perovskite when working as a High-Energy radiation detector and afterwards, analysing them in order to understand better its behaviour. Furthermore, detecting single High-Energy photons with them has become a firm short-term objective

    Effectiveness and Efficiency of Polymers in Enhanced Oil Recovery of High Water Cut Reservoirs of Varying Salinities and Temperatures via Reservoir Simulations

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    The world‟s energy demand is increasing and all indications are that oil will be the leading energy supply for the foreseeable future. However, a significant amount of the world‟s „easy to produce oil‟, has been produced. Additionally, some of the remaining oil is rendered immobile due to capillary forces (residual oil) and some oil will be bypassed and remains trapped (bypassed oil) even after a reservoir has undergone secondary recovery. This remaining oil can account for 45- 70% of the original oil in a hydrocarbon reservoir. Therefore, methods to both improve and enhance oil recovery are highly sought. Enhanced oil recovery methods serve to recover such oil through techniques such as: thermal recovery, gas injection, and chemical injection. The latter is the subject of this thesis. Chemical injection involves the use of a surfactant to reduce the surface tension between the oil and the oil bearing rock layer and/ or polymers to increase the viscosity of the injected fluid and thereby improving sweep efficiency and mobility of oil, thus increasing production. In general, the polymers are not effective in removing residual oil and has some associated problems. Conventional polymers have been reported to plug oil reservoirs, biodegrade (biopolymers), or become impuissant in reservoirs with high salinity or high temperatures. Therefore a better solution is needed. This project will evaluate the effectiveness and efficiency of a cassava starch- based polymer with the aim of increasing producibility of residual and bypassed oil, while eliminating negative effects of conventional polymers. Laboratory experiments and computationally efficient models will be employed to simulate the physical performance of the starch- based polymer in reservoir regimes of varying salinities and temperatures. Lastly, a sensitivity analysis will be undertaken to compare the recovery factor, concentration and profitability of starch- based polymer to that of two conventional polymers (Xanthan Gum and Hydrolysed Polyacrylamide (HPAM)). Through the above methods, it was observed, that when compared to conventional HPAM and Xanthan Gum polymers, the cassava starch- based polymer provides substantive viscosities at low concentration, is more effective in high salinity and high temperature regimes than Xanthan Gum and HPAM but is highly susceptible to biodegradation unless treated with additives. In addition, the oil production capability is comparable to HPAM and Xanthan gum. Residual oil production was inconclusive, pending core flooding experiments.

    Desafios editoriais da divulgação científica: os caminhos da Revista Geousp

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    Ao longo dos anos, a Revista Geousp passou por diversas mudanças visando o aperfeiçoamento de seus processos editoriais, adotando práticas sintonizadas com as demandas dos periódicos científicos de alto nível, chegando a 2024 posicionada entre as mais importantes publicações da Geografia da América Latina.Over the years, Revista Geousp has undergone several changes aimed at improving editorial processes, adopting practices in line with the demands of high-level scientific journals, and now in 2024 it is among the most important publications in Geography in Latin America.
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