Made available in DSpace on 2014-07-29T15:18:20Z (GMT). No. of bitstreams: 1 PAULO SERGIO DE OLIVEIRA RESENDE.pdf: 2092987 bytes, checksum: 9b30d95e68cb24f8eac4b2f3156d8b73 (MD5) Previous issue date: 2010-10-29 / The present study contemplates in a scient ific way the act ion of air ent raining agents in mortars produced in laboratory and the ef fects on the coat ings appl ied on porous subst rates (ceramic blocks, concrete blocks) . This is an experimental work, aiming to test the effect of the air entraining agents in fresh mortars, hardened state and the remaining ai r in coat ing appl ied. The variables were: ai r content , type of subst rate and sur face finishing. Adopt ing a methodology for varying levels of ent raining ai r, keeping fixed the subst rate, the form of appl icat ion and the type of sur face finishing, evaluat ing the propert ies of mortars in order to obtain the ideal air content of dosage. Other studies were done after evaluat ion of opt imal ai r content , keeping i t as a fixed condi t ion and varying the type of subst rate, appl icat ion type and the type of sur face finishing, in order to analyze thei r inter f erence in the amount of remaining ai r, as wel l as such inter ference coat ing appl ied. / O presente t rabalho aborda a ação da incorporação de ar em argamassas de revest imentos, produzidas em laboratór io, e seus efei tos em revest imentos apl icados sobre substratos porosos (bloco cerâmico, bloco de concreto, super fície de concreto). Trata -se de um estudo experimental , onde se aval ia os efei tos dos adi t ivos incorporadores de ar em argamassas nos estados f resco, no estado endurecido e como revest imento apl icado sendo que as principais variáveis estudadas foram: t ipo de adi t ivo, teor de ar, t ipo de sub st rato, t ipo de cimento e o t ipo de acabamento super ficial . Aval iou-se a inf luência da variação do teor de ar nas propriedades mecânicas das argamassas e revest imentos e ver ificou-se a variação do t ipo de acabamento super ficial influencia na resistência de aderência à tração e no desgaste do corte . Na aval iação das caracter íst icas físicas e das propriedades mecânicas dessas argamassas obteve-se um valor para o teor ót imo de ar incorporado. O estudo que teve como condições fixas o t ipo de subst rato padrão e a forma de apl icação, variando o teor de ar incorporado. Como resul tado constatou -se que há um teor ót imo para incorporação de ar , acima do qual as propriedades no estado f resco e endurecido começam a ser prejudicadas, devendo -se evi tar tais teores. Foi possível ainda veri f icar um melhor desempenho das argamassas com ar incorporado com relação à permeabi l idade à água quando comparadas com as argamassas sem adi t ivo incorporador de ar .

The purpose of this research work was to develop a nozzle capable of depositing dense CoNiCrAlY coatings via cold gas dynamic spray (CGDS) as well as compare the oxidation performance of bond coats manufactured by CGDS, high-velocity oxy-fuel (HVOF) and air plasma spray (APS) at temperatures of 1000°C and 1100°C. The work was divided in two sections, the design and manufacturing of a CGDS nozzle with an optimal profile for the deposition of CoNiCrAlY powders and the comparison of the oxidation performance of CoNiCrAlY bond coats. Throughout this work, it was shown that the quality of coatings deposited via CGDS can be increased by the use of a nozzle of optimal profile and that early formation of protective α-Al2O3 due to an oxidation temperature of 1100°C as opposed to 1000°C is beneficial to the overall oxidation performance of CoNiCrAlY coatings.

In this thesis, a Sb/C composite electrode for sodium-ion batteries isprepared by a simple high energy ball milling and calenderingmethod. The prepared Sb/C composite electrode was assembled in ahalf-cell and symmetrical cell setups in order to perform avariety of electrochemical measurements.The composite electrode showed a reversible specific capacity of595 mAh/g, at a discharge/charge current rate of 15 mA/g. Theelectrode also showed a relatively good performance (compared toprevious studies) of 95% capacity retention after more than 100cycles, at a higher discharge/charge current rate of 60 mA/g. Theelectrode furthermore showed excellent self-dischargecharacteristics, in pause tests implemented over 200 hours (overeight days), which underlined the electrode materials good shelflife properties. A series of Sb/C symmetrical cells assembledthrough-out the project, furthermore, highlighted the stability ofthe solid electrolyte interface (SEI) layer formed on the Sb/Ccomposite electrode during cycling. Scanning electron microscopy(SEM) and Energy-dispersive X-ray spectroscopy (EDS) were used tocharacterize the surface morphology and composition of the Sb/Celectrode, respectively.A non-milled and milled (12 hours) graphite electrodes were alsoprepared for reference and comparison. The milled graphite matrixelectrode provided a reversible capacity of 95 mAhg-1 and acoulombic efficiency (CE) of 99% in over 250 cycles, at a currentrate of 30 mA/g. Milled and non-milled graphite were characterizedwith SEM and Raman spectroscopy, to help have a fundamentalunderstanding of the particle size and material phase,respectively.

The aim of the diploma thesis is to elaborate the project documentation of kinderschule in the city Bucovice. The house is as a detached house in a newly-built area. The object is double-storeyed and without basement. It has rectangular size and is covered with a flat one coat roof. On the first floor there is one nursery department for eighteen children and technical facilities, on the second floor there is also one nursery department for eighteen children, a multipurpose hall and the head office. The house is build from brick with a contact thermal insulation system. Part of the project documentation is also a basic assessment of the building in terms of building physics.

This diploma thesis solves a project documentation of boarding house and contains appurtenances according to valid regulations. The house is as a detached house, without basement. It has rectangular size and is covered with a flat one coat roof and saddle roof with truss girders. The house has three floors with terrace. On the second and third floor is 14 guest rooms with social rooms. On the first floor is: pram room, bicycle/ski room, reception, utility rooms, wellness, restaurant, kitchen. In the house is designed a elevator. The house is brick with a contact thermal insulation system. Ceiling constructions are from prestressed panels. The house is designed on sloping terrain from south to north.

Tesis por compendio / [ES] La longevidad de las semillas, o el tiempo durante el cual permanecen las semillas viables, es de gran importancia para la conservación de la biodiversidad, la agricultura y la economía. Además, el estudio de este parámetro puede contribuir a conocer mejor los mecanismos moleculares comunes a todos los organismos para prevenir el envejecimiento. Una de las principales estrategias de las semillas para ralentizar su envejecimiento consiste en detener su metabolismo, a través de su deshidratación. Otros mecanismos moleculares para evitar daños son el aislamiento frente al entorno a través de la cubierta de la semilla, y la producción de antioxidantes y otras moléculas para evitar el daño oxidativo, uno de los principales causantes del envejecimiento de las semillas. Los mecanismos de reparación mitigan parte del daño acumulado. El organismo modelo de plantas Arabidopsis thaliana brinda la oportunidad de la realización de estudios genómicos para el estudio de, en este caso, la longevidad de las semillas para descubrir nuevos factores genéticos y mecanismos moleculares determinantes. Este conocimiento servirá para entender mejor los procesos de deterioro de las semillas y que también será clave para aumentar la longevidad de estas. Mediante el uso de variedades naturales genotipadas de Arabidopsis thaliana y un estudio de asociación del genoma conocido como GWAS, seguido de estudios de genética reversa, se han identificado 12 nuevos genes relacionados con la longevidad de las semillas, relacionados con la protección del embrión, el control del daño oxidativo, y la permeabilidad de la cubierta de la semilla. El desarrollo de la cubierta de la semilla está determinado por factores de transcripción. Plantas mutantes en diversos factores de transcripción involucrados en el desarrollo de la cubierta de la semilla presentan una longevidad alterada. La sobreexpresión de los factores de transcripción AtHB25 y COG1 provoca que las semillas presenten una mayor longevidad debido a una incrementada deposición de poliésteres lipídicos. Estas barreras de poliésteres lipídicos son la cutícula, formada por cutina, y la suberina. Ambas participan positivamente en la protección del embrión frente al ambiente exterior. Estudios genómicos de ambos factores de transcripción han demostrado que AtHB25 regula directamente a enzimas biosintéticos de los monómeros de suberina y cutina, y COG1 regula la expresión de enzimas relacionados con la polimerización de poliésteres lipídicos y lignina. La regulación en la que participa AtHB25 es muy importante debido a la alta conservación de las secuencias genómicas y funciones de AtHB25 en angiospermas, y parece involucrado en la respuesta a bajas temperaturas. Por otra parte, COG1, que está involucrado en la percepción de luz, regula parte del desarrollo del tegumento externo a través de la regulación de AP2, un factor clave en el establecimiento de la identidad de tejido de este tegumento de la cubierta de la semilla, donde se localiza la suberina. AtHB25 y COG1 están involucrados en la adaptación de la longevidad de la semilla a través de señales ambientales como la temperatura y la luz, respectivamente, regulando la deposición de poliésteres lipídicos. / [CAT] La longevitat de les llavors, o el temps que romanen les llavors viables, es de gran importància per la conservació de la biodiversitat, l'agricultura i l'economia. A més a més, l'estudi d'aquest paràmetre pot contribuir a conèixer millor els mecanismes moleculars comuns a tots els organismes per prevenir l'envelliment. Una de les principals estratègies de les llavor per retardar el seu envelliment consisteix detenir el seu metabolisme, mitjançant la seua deshidratació. Altres mecanismes moleculars per evitar danys son el seu aïllament de l'entorn per mitjan de la coberta de la llavor, i la producció d'antioxidants i altres molècules per evitar el dany oxidatiu, un dels principal causants del envelliment de les llavors. Els mecanismes de reparació mitiguen part del dany acumulat. L'organisme model Arabidopsis thaliana brinda la oportunitat de la realització d'estudis genòmics per a l'estudi de, en aquest cas, la longevitat de les llavors per descobrir nous factors genètics y mecanismes moleculars determinants. Aquest coneixement servirà per entendre millor els processos de deteriorament de les llavor i serà clau per augmentar la longevitat d'aquestes. Mitjançant l'ús de varietats naturals genotipades d'Arabidopsis thaliana i un estudi d'associació del genoma conegut com GWAS, seguits d'estudis de genètica inversa, s'han identificat 12 nous gens relacionats amb la longevitat de les llavors, relacionats amb la protecció de l'embrió, el control del dany oxidatiu, y la permeabilitat de la coberta de la llavor. El desenvolupament de la coberta de la llavor està determinada per factors de transcripció. Plantes mutants a diversos factors de transcripció involucrats al desenvolupament de la coberta de les llavors presenten una longevitat alterada. La sobreexpressió dels factors de transcripció AtHB25 i COG1 provoca que les llavors presenten una major longevitat degut a una deposició de polièsters lipídics incrementada. Aquestes barreres de polièsters lipídics son la cutícula, formada per cutina, i la suberina. Ambdues participen positivament la protecció de l'embrió enfront de l'entorn exterior. Estudis genòmics d'ambdós factors de transcripció han demostrat que AtHB25 directament regula a enzims biosintètics dels monòmers de suberina i cutina i COG1 regula enzims relacionats amb la polimerització de polièsters lipídics i lignines. La regulació en la que participa AtHB25 es molt important degut a l'alta conservació de les seqüències genòmiques i funcions de AtHB25 en angiospermes, i parteix estar involucrat en la resposta a baixes temperatures. Per altra banda, COG1, que està involucrat en la percepció de la llum, regula part del desenvolupament del integument extern mitjançant la regulació de AP2, un factor clau en l'establiment de la identitat de teixit de aquest integument de la coberta de la llavor, on es localitza la suberina. AtHB25 i COG1 estan involucrats en l'adaptació de la longevitat de la llavor per mitjan de senyals ambientals com la temperatura i la llum, respectivament, regulant la deposició de polièsters lipídics. / [EN] Seed longevity, or period that seeds remain viable, is important for biodiversity conservation, agriculture and economy. In addition, the study of this parameter could ease the knowledge about molecular mechanisms common to all organisms to prevent aging. One of the main strategies of seeds to reduce their aging consists to stop their metabolism, through drying. Other molecular mechanisms to avoid damages are the isolation from the environment with the seed coat, and the production of antioxidants and other molecules to avoid oxidative damage, one of the main seed aging causes. Repair mechanisms relieve part of the accumulated damage. The model plant Arabidopsis thaliana provides the opportunity to carry out genomic studies for the research of, in this case, seed longevity to discover determinant genetic factors and molecular mechanisms. This will serve to better understand seed deterioration processes and it will be key to increase seed longevity. Using natural genotyped varieties of Arabidopsis thaliana and a genome-wide association study (GWAS) followed by reverse genetic studies, 12 new genes related to seed longevity have been identified. They are related to embryo protection, oxidative damage control, and seed coat permeability. Seed coat development is determined by transcription factors. Mutant plants in some transcription factors involved in the seed coat development present altered seed longevity. The over-expression of the transcription factors AtHB25 and COG1 resulted in seeds with increased longevity due to an increased lipid polyester deposition. These lipid polyesters barriers are the cuticle, formed by cutin, and the suberin layer. Both participate positively in the embryo protection from the external environment. Genomic studies of both transcription factors have revealed that AtHB25 directly regulates biosynthetic enzymes of suberin and cutin monomers, and COG1 regulates the expression of enzymes related to the polymerization of lipid polyesters and lignin. The regulation involving AtHB25 is crucial due to the high conservation of genomic sequences and functions of AtHB25 in angiosperms, and it seems to be involved in the response to low temperatures. On the other hand, COG1, which is involved in light perception, regulates part of the development of the external integument through its regulation by AP2, a key factor in establishing the tissue identity of this seed coat integument, where suberin is located. AtHB25 and COG1 are involved in seed longevity adaptation through environmental signals such as temperature and light, respectively, regulating lipid polyesters deposition. / Agradezco a las instituciones públicas la inversión en investigación. Gracias a ella, los laboratorios, el personal y los distintos equipos se han podido financiar. Gaetano fue quien me ayudó enormemente conseguir la beca FPI del Ministerio de Economía y Competitividad BES-2015-072096, asociada al proyecto de investigación nacional BIO2014-52621-R-AR / Renard Meseguer, J. (2021). Identification of genes related to seed longevity in Arabidopsis thaliana using genomic molecular techniques [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/170554 / TESIS / Compendio

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This thesis resumes both theoretical and practical knowledge with surface protection by wet painting which the student achieved during her studies and within her practice which she got in the painting shop of cabs for building, handling and agricultural machines. In her thesis the student has found out that one of current trends focuses on the method which is ecologically friendly and preserves paint lifetime. To achieve that, ED-coat painting is used first and then followed by the painting of waterborne paint. Within the scope of her thesis objective she has also optimised the process of surface protection respective technological pre-treatments and parameters which are carried out during ED-coat and e-coat painting, such as optimal thickness of coating, temperatures or technological time outs.

Corrosion protection is very significant for metals in modern society from the view of industrial development. This thesis work project involves a research study that is aimed to investigate the effect of corrosion on the mechanical strength and magnetic properties of four no treated or treated Somaloy® component samples (Somaloy®700 1P,  Somaloy®700 3P, Somaloy®700HR 5P and Somaloy®110i 5P) provided by Höganäs AB and laminated steel sheets by salt spray test. The coatings for protection are phosphoric acid coating, sodium silicate coating, DCA-Modified silicone conformal coating and water-borne single coat paint respectively. Then the protective properties are evaluated by Electrochemical Impedance Spectroscopy (EIS) in 0.1 mol/L NaCl solution after 7 days exposure.   From transverse rupture strength (TRS) and hysteresis loop measurements by salt spray test, although the bar samples are treated coating, the corrosion decreases the mechanical strength to a certain extent more or less over time. For the magnetic properties, the corrosive environments hardly influence the magnetic parameters of the no treated or four types of coatings treated Somaloy® components. But the all kinds of magnetic parameters for laminated ring samples have a great variation after salt spray test.   In the EIS measurements, for the no treated samples, the initial corrosion resistance is only several hundred ohms and decreases after 1 hour, 8 hours and 1day exposure, then increases to a certain extent with time due to the corrosion products formed on the surface. For the sodium silicate coating, the initial corrosion resistance is approximately several ten thousands ohms and decreases rapidly only after 1 day exposure to several hundred ohms due to the sodium silicate film dissolves in the electrolyte solution and has no effective protective property. Then the following corrosion process is almost same as the no treated samples. For the water-borne single coat paint, the initial corrosion resistance can reach to several Giga-ohms and decreases over time, but can still stay at  level, indicating that this coating has a very good and effective protective properties.   EIS experiments indicate that water-borne single coat paint has a more effective protection than sodium silicate coating and can apply a better corrosion protection for the Somaloy® components   Key words: corrosion protection, soft magnetic composites, phosphoric acid coating, sodium silicate coating, DCA-Modified silicone conformal coating , water-borne single coat paint, salt spray test, TRS, hysteresis loop, EIS

The diploma thesis deals with using of reinforcing composite materials in asphalt layers. These geosynthetic materials are in road construction used especially to reduce spreading cracks and extend the service life of the construction. As par of this work, test specimens of different types of asphalt layers were produced. These samples were subjected to laboratory testing, where the results of different reinforced asphalt slabs were compared. Within the diploma thesis primarily deals with the testing of the shear bond strength between asphalt layers in order to determine what are the other influencing factors of the test. Another part of the thesis is the 4-point bending test, during which a special technology in the form of a DIC camera was used to monitor the behavior of the asphalt layer over time.