Browsing by Issue Date, starting with "2017-02-23"
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- Tenebrio molitor for food or feed: rearing conditions and the effects of pesticides on its performancePublication . Ribeiro, Nuno Tiago Garrucho Martins; Costa, Rui Manuel Machado daAbstract Tenebrio molitor is one of the most reared species of insect at industrial scale. The entire life cycle of mealworms takes place in the same ecosystem and the duration of the different stages is highly dependent on environmental and physical conditions such as temperature, relative humidity, diet and population density. Most of the environment conditions as well as diet have already been studied and are documented. Tenebrio molitor is deeply adaptable to extreme dry conditions, obtaining water from both food ingestion (even substances with low water content) and/or atmosphere, however larvae grows faster in moist conditions upper than 70%. At the industrial scale, water can be provided as pure water, through wet paper, fresh vegetables with high water content or even polymers capable of absorbing water (polyacrylamide). Chapter 1 is a review of the optimal conditions for Tenebrio molitor rearing. In Chapter 2, the effects of relative humidity and the effects of ingesting fresh vegetables contaminated with pesticides and polyacrylamide are evaluated. Relative humidity affected the development of mealworm larvae, with higher pupation and body mass attained at 65% and with faster growth rates attained at 40%. No effects of pesticides were detected. However, the chemical analysis of body mass will allow knowing if there was bioaccumulation.).
- Segurança alimentar e boas práticas na distribuiçãoPublication . Oliveira, Bárbara Manuela Rocha; Gândara, João Filipe MarquesResumo O presente relatório de estágio está inserido no âmbito do trabalho final de mestrado do curso de Engenharia Alimentar, na Escola Superior Agrária de Coimbra. Teve por base 6 meses de estágio curricular na empresa DIA Portugal supermercados, SOC. UNIP. Lda., mais especificamente no entreposto de distribuição de Valongo (no Porto), no período de 15 de Fevereiro a 29 de Julho. O principal objetivo foi a aplicação dos conhecimentos adquiridos ao longo deste mestrado, no que diz respeito às noções básicas de segurança alimentar e boas práticas na cadeia de distribuição. No laboratório do Controlo de Qualidade, as atividades propostas visaram a realização de análises internas ao vasto sortido de artigos marca DIA, a realização da gestão de datas de validade aos artigos que assim o exigem, a resposta a reclamações de loja e/ou clientes, bem como a realização de auditorias internas, a nível de cadeia de frio, limpeza e higiénico- sanitária ao entreposto de distribuição. De forma a garantir a segurança e a qualidade dos alimentos ao longo de toda a cadeia de distribuição (desde o ato de descarga do produto no armazém, armazenamento, preparação e transporte para a loja) é necessário cumprir uma série de procedimentos, de forma a garantir quer a segurança quer a qualidade do produto, como é o caso das análises internas. Estas, são realizadas aos produtos de marca própria e permitem não só avaliar a qualidade do produto, como perceber se o fornecedor está a cumprir com aquilo que foi, previamente, estipulado na ficha de qualidade do produto. Para além disso, e uma vez que dentro do sortido de produtos exclusivos e/ou com a insígnia DIA estes poderão ter ou não gestão de validade, o laboratório de controlo de qualidade é ainda responsável por essa mesma gestão. Uma outra parte bastante importante, gerida pelo laboratório são as reclamações de loja/cliente, uma vez que cabe a este departamento fazer uma primeira avaliação do artigo reclamado/devolvido e, se assim se justificar, dar resposta às mesmas. E, como em qualquer empresa do ramo alimentar, a DIA realiza auditorias da qualidade como uma ferramenta de gestão utilizada para avaliar as atividades relacionadas com o sistema de gestão da qualidade fundamental para a sua melhoria contínua e para a verificação do correto cumprimento de todos os procedimentos adotados pela DIA. Palavras-chave: Cadeia de Distribuição; Controlo da Qualidade; Laboratório. Abstract This internship report is part of the final Master Degree course in Food Engineering at Coimbra College of Agriculture. It was based on 6 months of curricular internship in the company DIA Portugal supermercados, SOC. UNIP. Lda., more specifically in the distribution warehouse in Valongo (Porto), from 15 February until 29 July. The main objective was the application of the knowledge acquired during this master degree, with regard to the basic concepts of food safety and good practices in the distribution chain. In the laboratory of Quality Control, the proposed activities passed through the realization of internal analyzes to the several products of DIA brand, the management of expiration dates for articles that require it, the response to the complaints from stores and/or customers, as well as the realization of internal audits to the cold chain, cleaning and hygienic-sanitary in the distribution warehouse. In order to ensure the safety and quality of the products throughout the entire distribution chain (from the act of discharge of the product into the warehouse, storage, preparation and transport to the store) it is necessary to comply with a series of procedures, to ensure the safety and quality of the product, as is the case of internal analyzes. These are made to own brand products and allow not only to evaluate the quality of the product, but also to see if the supplier is complying with what was previously stipulated in the product quality sheet. In addition, since within the assortment of exclusive products and/or with the DIA symbol these may or may not have validity management, the laboratory of quality control is still responsible for the same management. Another part very important, managed by the laboratory is the stores and/or customers complaints, since it is up to this department to make a first evaluation of the claimed/returned article and, if it is justified, to respond to them. And, as in any food business, DIA realizes the quality audits as a management tool used to evaluate the activities related to the quality management system that is fundamental to its continuous improvement and to verify the correct compliance of all procedures adopted by them. Key-words: Distribution Chain; Quality Control; Laboratory.
- Análise acústica dos fonemas /S, 3/ produzidos por crianças com desempenho articulatório alteradoPublication . Figueiredo, Ana Catarina; Grilo, Ana Margarida
- Análise acústica dos fonemas /s, z/ produzidos por crianças com desempenho articulatório alteradoPublication . Oliveira, Filipa; Grilo, Ana Margarida
- Measurements of top-quark pair to $Z$-boson cross-section ratios at $\sqrt s = 13, 8, 7$ TeV with the ATLAS detectorPublication . ATLAS collaboration (2834 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Oleiro Seabra, Luis Filipe; Onofre, António; Pedro, Rute; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutRatios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of $ \sqrt{s}=13 $ TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given $ \sqrt{s} $ for the two processes and at different $ \sqrt{s} $ for each process, as well as double ratios of the two processes at different $ \sqrt{s} $ , are evaluated. The ratios are constructed using previously published ATLAS measurements of the $ t\overline{t} $ and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z → ℓ$^{+}$ℓ$^{−}$ where ℓ = e, μ at $ \sqrt{s}=13 $ TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb$^{−1}$. Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z → e$^{+}$ e$^{−}$ and the Z → μ$^{+}$ μ$^{−}$ channels for each $ \sqrt{s} $ value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02.