Analytical study of accelerated light ageing and cleaning effects on acrylic and PVAc dispersion paints used in Modern and Contemporary Art

En el trabajo con el título "Analytical study of accelerated light ageing and cleaning effects on acrylic and PVAc dispersion paints used in Modern and Contemporary Art" se han empleado diferentes técncias analíticas con el fin de optimizar protocolos experimentales para la caracterización de la estabilidad de acrílicos y acetatos de polivinilo (PVAc) frente a ensayos de envejecimeinto acelerado y tratamientos de limpieza. El estudio de los procesos de degradación causados por la exposición a la luz se ha desarrollado sobre una amplia seria de muestras acrílicas y vinílicas expuestas a dos tipos de envejecimiento acelerado con condiciones de envejecimiento artificail representativas de un envejecimiento natural. La información química y mecánica obtenida por ambos ensayos de envejecimiento acelerado permitió identificar procesos de degradación específicos tales como entrecruzamiento o escisión de cadenas. Las conclusiones obtenidas de forma general apuntan que los acrílicos son materiales más estables que los vinílicos y los estireno-acrílicos. Asimsismo, en este estudio se han aborado los efectos de los tratamientos de limpieza bien de base acuosa, bien con disolventes orgánicos, en las propiedades físico-qúimicas en muestras acrílicas y vinílicas. También se han evaluado otros métodos de limpieza tales como geles o emulsiones. Los resultados indican que los tratamientos acuosos extraen aditivos, afectan la morfología e inducen cambios en las propiedades mecánicas de las muestras. Estos efectos pueden ser reducidos con el uso de sistemas alternativos de limpieza.De Sousa Ramos Félix Silva, M. (2011). Analytical study of accelerated light ageing and cleaning effects on acrylic and PVAc dispersion paints used in Modern and Contemporary Art [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/13829Palanci

Efeito da refrigeração em leite de ovelha - evolução da flora microbiana e efeito na aptidão tecnológica para queijo

Mestrado em Engenharia Zootécnica - Produção animal - Instituto Superior de AgronomiaThe objective of this study was to investigate the effect of the cooling on ewe’s milk. After an initial characterization, the raw milk was refrigerated at 4 °C and 8 °C for seven days, through what was studied the evolution of the microbial population (total mesophilic (ISO/DIS 6610) and psychrotrophic (ISO/ IS 8552)), pH and the ability to coagulation, through clotting tests with the Optigraph. After three days of cooling, there were increases in the population of mesophiles, 10 and 52, and 15 and 87 times the values of psychrotrophic, at 4 °C and 8 °C, respectively. The pH decreased very significantly along the cooling, especially at 8 °C and from 2nd day, which influenced the start of the micellar aggregation. The cooling at 4 °C showed no significant effect on the ability to clotting and allowed the control of development of microbial populations (particularly the psycrotrophic population) for a period of 48 hours. The results presented in this study reinforce the belief that when the cooling is at inadequate temperatures and storage times, microbial populations can be selected favoring psychrotrophic bacteria that may have a negative effect on manufacture of the cheese from raw milk

Does 3D Ultrasound Enhance the Diagnosis of Bladder Tumours in Patients with Haematuria?

Purpose. Bladder cancer is a frequent cause of haematuria in elderly patients, and bladder ultrasound (US) is a valuable tool in diagnosing these malignancies. We examined the accuracy of 3D bladder US in diagnosing bladder tumors in patients with haematuria. Patients and Methods. Twenty-one patients observed in the emergency department for haematuria underwent a kidney and bladder US. Patients with normal or uncertain bladder US findings underwent a 3D US and a cystoscopy. Results. In 5 (23.8%) patients, the 3D US detected bladder tumours not seen in 2D US. All these patients were found to have bladder tumours on cystoscopy. Another 5 (23.8%) patients with uncertain findings on 2D US had normal 3D US and cystoscopy. 3D US showed a sensitivity of 83.3% and a specificity of 100% with a positive predicted value and negative predictive values of 100% and 93.8%, respectively. Conclusion. 3D US was more sensitive than 2D US in diagnosing bladder tumours in patients with haematuria

Emerging media practices with the Displr platform for place-based engagement

Place-based communication is about contextual messages delivered at specific locations where certain types of people congregate for particular purposes. A successful approach to place-based communication should explore the whole ecology of personal and public devices that characterises most public places. While social media and mobile are now mainstream and an integral part of communication strategies, place-based communication remains a complex and laborious undertaking that can only be accomplished with custom, expensive projects that are hard to understand, appropriate and sustain.Displr is a place-based communication platform that enables venues to reach their visitors more effectively by easily combining screen displays, social media and mobile engagement. Displr empowers any venue to create and manage a targeted, smart, cost-effective, interactive and cross-channel medium, without the need for external expertise or time consuming tasks. To understand some of the new possibilities and implications of place-based communication, we have conducted a study on publication practices in the Displr platform. Overall, these findings suggest that, with place-based displays, publication practices tend to be less formal and much more situated than what is now common in most display networks. This suggests that the possibility to appropriate the medium is highly valued and may prompt for more situated and spontaneous forms of communicationThis work is funded by project 11304 (16/SI/2015), supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF).info:eu-repo/semantics/publishedVersio

Estudo de concordâncias de maré entre marégrafos

A configuração dos fundos e da linha de costa em Portugal Continental influenciam a propagação da onda de maré junto à costa. Os registos maregráficos, obtidos nas estações da Rede Maregráfica Nacional, permitiram caracterizar o tipo de maré e efetuar a análise e previsão da maré astronómica nos principais portos nacionais. Na costa de Portugal, a maré é do tipo semidiurno regular, o que permite deduzir certas relações entre a amplitude e o retardo, das principais constituintes semidiurnas, pelo método não-harmónico. No presente trabalho, apresentam-se comparações e concordâncias entre marégrafos próximos, para diferentes áreas e portos principais, para ser possível ter uma perceção de como se propaga a maré ao longo da costa. Para isso foi utilizado o software R e folhas de cálculo Excel para calcular as concordâncias dos portos. Foram também analisadas possíveis alterações das relações entre portos ao longo do tempo. O objetivo principal do presente trabalho foi cumprido tendo sido obtidos numerosos dados e gráficos com boa qualidade e passíveis de uma boa análise crítica onde se pode perceber como se propaga a maré na costa ocidental portuguesa. Destacam-se vários aspetos inovadores neste trabalho, nomeadamente as concordâncias entre portos principais que é algo que não foi encontrado em mais nenhum trabalho ou estudo, e o facto de ter sido analisado um longo período de dados permitindo não só perceber como evoluiu a propagação da maré e as suas constituintes ao longo dos anos, mas como se propaga agora no presente e quais são as diferenças que daí advêm. Entre várias conclusões retiradas com este trabalho as mais significativas foram: o marégrafo de Aveiro não é favorável para concordâncias entre portos principais, a onda de maré propaga-se de Sul para Norte na costa ocidental portuguesa demorando 26′ 15′′, entre Sines e Leixões, com velocidade de, aproximadamente, 821 km/h.The configuration of the seabed and the coastline in mainland Portugal influence the tidal wave propagation near the coast. The tide gauge records, obtained in the stations of the National Tide Gauge Network, allowed to characterize the type of tide and to perform the analysis and forecast of the astronomical tide in the main national ports. In the Portuguese coast, the tide is of the regular semidiurnal type, which allows deducing certain relations between the amplitude and the delay, of the main semidiurnal constituents, by the non-harmonic method. In the present work, comparisons and concordances are presented between nearby tide gauges, for different areas and main ports, in order to be able to have a perception of how the tide propagates along the coast. This was done using the software R and Excel spreadsheets to calculate port concordances. Possible changes in the relationships between ports over time were also analysed. The main objective of the present work was fulfilled having been obtained numerous data and graphs with good quality and susceptible of a good critical analysis where it is possible to understand how the tide propagates in the Portuguese western coast. We highlight several innovative aspects in this work, namely the concordances between main ports which is something that has not been found in any other work or study, and the fact that a long period of data has been analysed allowing not only to understand how the tidal propagation and its constituents evolved over the years, but how it propagates now in the present and what are the differences arising from it. Among several conclusions drawn with this work the most significant were: the tide gauge of Aveiro is not favourable for concordances between main ports, the tidal wave propagates from south to north on the Portuguese west coast, taking 26′ 15′′, between Sines and Leixões, with a speed of approximately 821 km/h