Thèses sur le sujet « Isolation du cycle CPU »
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Yang, Ye. « Isolation Mechanisms within the vSwitch of Cloud Computing Platform ». Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS191.
Texte intégralAs an important component of cloud platform, virtual switch (vSwitch) is responsible for achieving network connectivity between virtual machines (VMs) and external devices. Most existing vSwitches adopt the split design principle, which destroys the isolation between VMs. In vSwitch, different VMs compete for shared resources and unrestricted memory access, making them unable to guarantee stable network quality of service (QoS), while facing the risk of data plane attacks and illegal access to memory. In order to solve these performance, failure and security problems caused by the lack of isolation, the main works and contributions of this thesis are as follows: 1) Network QoS method based on CPU cycle isolation (C2QoS). This approach secures VM network bandwidth by isolating concurrency from CPU resources, and at the same time reduces additional VM network latency caused by concurrency by 80%. 2) Data plane attack defense mechanism based on stream table isolation (D-TSE). D-TSE uses VM as the unit to separate the flow table structure to achieve independent packet classification performance and fault isolation at the cost of 5% additional CPU usage. 3) Virtualized Network I/O (VNIO) mechanism based on Memory Access Isolation (S2H). Based on a secure memory sharing model, S2H provides VM memory isolation and security at the cost of 2-9% increased latency
McCaffery, Kevin A. « Isolation and Characterization of a Microorganism from Groundwater that Reduces Arsenate ». Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/McCafferyKA2002.pdf.
Texte intégralRoss-Macdonald, Petra B. « Isolation of a cell cycle control gene from the malaria parasite Plasmodium falciparum ». Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329897.
Texte intégralSmith, Simon A. « Molecular analysis of the yeast cell cycle : isolation and characterization of a new gene, TSM3721 ». Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253128.
Texte intégralGazon, Matthieu. « Impact des caractéristiques de l'injection sur les processus à l'origine des fluctuations cycle à cycle du bruit de combustion d'un moteur diesel ». Rouen, 2008. http://www.theses.fr/2008ROUES052.
Texte intégralDue to the actual standards and environmental conditions, the car manufacturers have to think about the problem of pollutant emissions. But, to better control the environment, the local authorities are more and more interested in the acoustic emissions of vehicles. The problematic of this study is based on an observation made on a Diesel engine : important cycleto-cycle fluctuations (leading to unpleasant perception) can appear at low engine speed and low charge (brake mean effective pressure). This is a significant problem since such engine operating conditions are representative of the urban driving (repetitive stops, low-speed circulation,. . . ). This study has been made to try to answer the question : are fluctuations in injection system responsible for fluctuations in the combustion and in the combustion noise ? The experimental study presented here is based on two experimental devices. Experiments conducted on an engine test-bench allowed to characterize the combustion and the combustion noise. An injection test-bench was also used to characterize the injection system behavior in conditions close to the engine ones. The experiments on this setup led to a model for the determination of the injected fuel mass and its cyclic fluctuations. A simultaneous characterization of the injection system (injector command, injection pressure,. . . ) and of the combustion process (cylinder pressure, rate of heat release, combustion noise,. . . ) was conducted. The model for the injected fuel mass estimation has been applied to the data acquired on the engine test-bench. For the studied engine, the results show that the link between the combustion noise and the injection system if it exists, remains weak
Adou, Eba. « I. Isolation and Characterization of Bioactive Compounds From Suriname and Madagascar flora. II. A Synthetic Approach to Lucilactaene ». Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29973.
Texte intégralPh. D.
Biscans, Sébastien. « Optimization of the Advanced LIGO gravitational-wave detectors duty cycle by reduction of parametric instabilities and environmental impacts ». Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1019/document.
Texte intégralThe LIGO project is a large-scale physics experiment the goal of which is to detect and study gravitational waves of astrophysical origin. It is composed of two instruments identical in design, located in the United States. The two instruments are specialized versions of a Michelson interferometer with 4km-long arms. They observed a gravitational-wave signal for the first time in September 2015 from the merger of two stellar-mass black holes. This is the first direct detection of a gravitational wave and the first direct observation of a binary black hole merger. Five more detections from binary black hole mergers and neutron stars merger have been reported to date, marking the beginning of a new era in astrophysics. As a result of these detections, many activities are in progress to improve the duty cycle and sensitivity of the detectors. This thesis addresses two major issues limiting the duty cycle of the LIGO detectors: environmental impacts, especially earthquakes, and the issue of unstable opto-mechanical couplings in the cavities, referred to as parametric instabilities. The control strategies and tools developed to tackle these issues are presented. Early results have shown a downtime reduction during earthquakes of ~40% at one of the LIGO sites. Moreover, the electro-mechanical device called ‚Acoustic Mode Damper™ designed and tested during the thesis should completely solve the issue of parametric instabilities for LIGO. In conclusion, we will show that the problems tackled in this thesis improved the overall duty cycle of LIGO by 4.6%, which corresponds to an increase of the gravitational-wave detection rate by 14%
Strandberg, Linnéa. « Isolation of the native chloroplast proteome from plant for identification of protein-metabolite interactions ». Thesis, KTH, Proteinvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301783.
Texte intégralIn order to feed a growing population, the crop yield needs to be increased. One way to do this is to optimise the photosynthetic activity in the plant, which includes improvement of carbon fixation. To succeed with this, knowledge of the regulation of key proteins in the chloroplast is required. The aim of this project is to identify possible regulatory protein-metabolite interactions in chloroplasts from Arabidopsis thaliana. The target proteins are the 11 enzymes of the Calvin-Benson-Bassham cycle. The metabolites of interest are 3PGA, ATP, FBP, GAP, which are intermediates or co-factors of the cycle;2PG, which is a product of a competing reaction in the cycle; and finally G6P, citrate and sucrose, which are central metabolites in other vital reactions in the cell. Before the experiments with Arabidopsis, spinach was used as a test organism to evaluate the proposed protocols. First, chloroplasts were isolatedfrom leaves. When the integrity of the chloroplasts had been validated, the proteins were extracted. Metabolic interactions with the extracted proteins were analyzed with limited proteolysis-small molecule mapping. This method, which combines limited proteolysis with mass spectrometry, detected severalprotein-metabolite interactions. In Arabidopsis, all enzymes except for FBPase, PPE and TIM had atleast one interaction. In spinach, interactions were seen with FBA, GAPDH, PGK, PRK, RuBisCO,TIM and TK. The results highlight potential regulatory events, which could be used to target bottlenecks in carbon fixation. This could provide a pathway to increase the flux in the Calvin-Benson-Bassham cycle, and thereby improve carbon fixation in plants.
Bergman, Robin, et Johan Nilsson. « Utvärdering av JTAG Boundary scan somtestmetod vid temperaturchocker ». Thesis, KTH, Hållbar produktionsutveckling (ML), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286255.
Texte intégralSilva, Renata Moreira da. « Um corpo que abriga uma vida e um vírus : o significado da maternidade para mães soropositivas para HIV ». reponame:Repositório Institucional da UFBA, 2012. http://www.repositorio.ufba.br/ri/handle/ri/12253.
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FAPESB
O estudo dos processos afetivos na psicologia é de grande importância e tem sido objeto de atenção crescente, em particular entre os pesquisadores na área da Psicologia Cultural. A maternidade e a soropositividade são contextos nos quais rupturas e transições ocorrem de forma impactante na vida dos indivíduos, contribuindo para a ocorrência de uma importante variedade de reações emocionalmente orientadas. O objetivo geral desse estudo foi analisar o significado da maternidade para mães soropositivas para HIV. Os objetivos específicos, por sua vez, foram (a) analisar os processos envolvidos na garantia de continuidade do self em condições de ruptura de mães soropositivas para HIV, e (b) caracterizar os recursos simbólicos disponíveis ou criados pelas mulheres que experienciam a maternidade sendo soropositivas para HIV. Para atingir os objetivos, foi realizado um estudo de casos, através de narrativas de histórias de vida com dez mães soropositivas para HIV, entrevistadas no CEDAP, na cidade de Salvador/Bahia. As entrevistas realizadas foram transcritas e submetidas à análise de entrevista narrativa. O conceito desenvolvido nesse estudo, o Ciclo de Isolamento, detalhou como ocorre o processo de retirada dos contextos de interação social, que envolve custo emocional e pode estar associado a processos de depressão. A existência de uma rede social de suporte mostrou-se como condição fundamental para uma melhor qualidade de vida na vivência da maternidade. As experiências de enfrentamento perante as dificuldades - seja a dor da descoberta do HIV, da traição, da impossibilidade da amamentação ou dos episódios de discriminação – são bastante diversificadas, a depender da presença ou ausência de outros importantes ao lado dessas mulheres. A participação da família na vida dessas mulheres é imprescindível para o seu bem estar e para seu fortalecimento físico, emocional, mental e social. O Ciclo de Isolamento é relevante enquanto construto teórico capaz de especificar processos em curso quando a pessoa experiência situações socialmente estigmatizadas e tem implicações para a prática profissional em diversas áreas. Destaque-se sua utilidade potencial para o planejamento de ações na promoção de saúde pública. The study of affective processes in psychology is of great importance and has been the subject of increasing attention, particularly among researchers in the field of Cultural Psychology. Motherhood and seropositivity are contexts in which ruptures and transitions are striking in the lives of individuals, contributing to the occurrence of a variety of important reactions emotionally oriented. The general objective of this study was to analyze the meaning of motherhood for mothers infected with HIV. The specific objectives, in turn, were (a) analyze the processes involved in ensuring continuity of the self in terms of disruption to mothers seropositive for HIV, and (b) to characterize the symbolic resources available or created by women who are experiencing motherhood seropositive for HIV. To achieve the goals, we performed a case study, through narratives of life histories with ten HIV seropositive mothers, interviewed in the CEDAP, the city of Salvador / Bahia. The interviews were transcribed and analyzed for narrative interview. The concept developed in this study, the Isolation Cycle, detailed process of withdrawal of the contexts of social interaction, which involves emotional cost and can be associated with cases of depression. The existence of a network of social support proved to be a prerequisite for a better quality of life in the experience of motherhood. The experiences of coping with the difficulties - the pain of the discovery of HIV, betrayal, or the impossibility of breastfeeding episodes of discrimination - are quite diverse, depending on the presence or absence of important others alongside these women. Family participation in the lives of these women is essential to their well being and strengthening their physical, emotional, mental and social. The Isolation Cycle is relevant as theoretical construct able to specify processes in progress when the person experiences situations socially stigmatized and has implications for professional practice in various areas. Stand out from its potential usefulness for planning actions to promote public health.
Salvador
Johansson, Martin, et Konstantin Kanellos. « Livscykelanalys och optimering av isoleringstjocklek för moderna byggnader : - med fokus på kv Limnologen i Växjö ». Thesis, Växjö University, School of Technology and Design, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1541.
Texte intégralSyftet med denna rapport är att visa hur en ökning av isolertjockleken i ett hus påverkar kostnader och energiåtgång för isoleringen i ett livscykelperspektiv, samt för husets bruksskede. I studien har en optimering av isoleringen på ett pågående byggprojekt i Växjö, kv Limnologen, utförts. Total energiåtgång för isoleringens livscykel har tagits fram från tidigare utförda livscykelanalyser (LCA). Husets värmebehov har beräknats mha information från ritningar och kontakter med personer i anknytning till kv Limnologen. En ekvation har utformats för att finna ett teoretiskt optimum för isolertjockleken med inriktning mot total energiåtgång, koldioxidutsläpp och ekonomi. Resultatet för optimeringen av total energiåtgång visar att optimum ligger vid den dubbla tjockleken för tak och grund, samt tredubbla för väggarna. För koldioxidutsläpp och ekonomin är resultatet mer beroende av husets uppvärmningskälla. Fjärrvärme med biobränslen är mer miljövänligt och ekonomiskt idag i jämförelse med fossila bränslen. Det innebär att hus som är oljeuppvärmda bör isoleras betydligt mer. I denna studie sammanställs en del faktorer såsom energi, koldioxid och ekonomi vilket gör det lättare att analysera och värdera dem. Att isolera till vårt framräknade optimum vore inte relevant då detta är ett teoretiskt värde och inte tar hänsyn till förändringar i konstruktionen och andra problem som kan uppstå. Optimeringskurvan visar att vinsten ökar snabbast de första centimetrarna av tilläggsisolering och om konstruktionen inte påverkas nämnvärt skulle det vara möjligt att utföra detta tillägg. Slutsatsen är att husen som byggs på kv Limnologen är välisolerade enligt dagens förutsättningar.
The aim with this report is to show how an increase of the thickness of insulating in a house influences the costs and the energy consumption for the insulation in a life cycle perspective and for the usage stage of the house. An optimization of the insulation on an ongoing construction project in Växjö, Limnologen has been carried out in the study. Total energy consumption for the insulation’s life cycle has been taken from earlier accomplished life cycle assessments (LCA). The house's heat need has been calculated on the basis of information from blueprints and contacts with persons in connection to Limnologen. An equation has been formulated in order to find a theoretical optimum for the insulating thickness regarding total energy consumption, carbondioxide and economy. The result of the optimization for total energy consumption shows that optimum lies at the the double thickness for ceilings and foundation, and triple for the walls. For carbondioxide and the economy the result is more depending on the house's heating source. District heating with biomass fuel is more environmentally friendly and economic today compared with fossil fuel. It means that houses that are oil heated should be insulated considerably more. In this study a compilation of some factors have been made, such as energy, carbondioxide and economy which makes it easier to compare them. Insulating to the calculated optimum is not relevant because the optimum is a theoretical value and does not take into consideration structure solutions and other problems that can arise. On the other hand the optimization curve shows that the profit increases rapidly at the first centimetres of additional insulation and if the structure is not affected markedly this addition would be profitable to carry out. The conclusion is that the buildings raised at Limnologen are well insulated with the presumptions of today.
Ababsa, Mohamed Lamine. « Caractérisation de composants magnétiques et diélectriques pour les machines électriques tournantes très haute température High temperature magnetic characterization using an adapted Epstein frame High temperature characterization of electrical steels using an adapted Epstein frame ». Thesis, Artois, 2018. http://www.theses.fr/2018ARTO0205.
Texte intégralIn this thesis work, we carried out a magnetic characterization measurements (hysteresis cycles, losses, H_c...) at very high temperatures up to 600 °C, using a characterization device adapted to these extremes conditions which is an Epstein frame that we have developed and implemented. Its validation is verified with a standard frame at ambient temperature. The measurements are performed by two types of ferromagnetic sheets mostly used: FeSi GO and NO. The results show a decrease with temperature in iron losses and different parameters which define the hysteresis cycle, and expose a similarity between the variation of coercive field and the losses per cycle. Subsequently, we described the losses and the coercive field as a function of temperature and frequency. That is done by a linear empirical equations in case of saturated materials and by an extension at high temperature of the Bertotti equation via an identification of its parameters in case of unsaturated materials. In a second phase, by measuring the voltage of partial discharge and of the electrical breakdown we characterized the insulation of a conductor intended to be used at a high temperature covered by mica; this later has an inorganic origin. These results show that the inhomogeneity of this insulation along of the conductor causes destructive discharges without appearance of partial discharges. This kind of wire consists of copper surrounded by a thin nickel layer and this later has been characterized magnetically during our work
Vestman, Simon. « Cloud application platform - Virtualization vs Containerization : A comparison between application containers and virtual machines ». Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14590.
Texte intégralPilate, Vinícius José. « Comportamento e ciclo de vida de Dysopeas muibum Marcus & ; Marcus, 1968 (Mollusca, Subulinidae) em laboratório : efeitos do isolamento e do fotoperíodo sobre padrões de crescimento, reprodução, mortalidade e conquiliomorfometria ». Universidade Federal de Juiz de Fora, 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/1487.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O conhecimento dos aspectos biológicos, morfológicos e comportamentais dos moluscos terrestres é importante para o desenvolvimento de medidas de controle de pragas e de estratégias de conservação de espécies. O presente trabalho teve como objetivo caracterizar os padrões de biologia, conquiliomorfometria e comportamento da espécie Dysopeas muibum e verificar os efeitos do isolamento e do fotoperíodo sobre seu ciclo de vida e a morfometria da concha, em condições de laboratório. Foi realizado o acompanhamento do crescimento da concha, da liberação de filhotes e da mortalidade de 160 moluscos, dos quais 40 foram mantidos isolados e 120 agrupados (10 moluscos por grupo; 40 em condições naturais de temperatura, umidade relativa do ar e fotoperíodo, e 80 tendo estas condições controladas – 40 com dias longos e 40 com dias curtos), desde o nascimento até 180 dias de vida, quando então foram aferidas as medidas da concha. Para verificar o horário de atividade e compor o etograma, 30 moluscos adultos (10 moluscos por grupo) foram observados durante 24 horas contínuas, através do método de varredura, com registro dos atos comportamentais a intervalos de 20 minutos. Já para verificar a ocorrência de agregação e a preferência por sítio de repouso, durante cinco dias, a intervalos de 24 horas, foram observados de 30 moluscos adultos (10 moluscos por grupo): número de agregações, de indivíduos agregados e isolados, e de indivíduos sob o disco com alimento, sob o disco sem alimento, sobre o substrato, enterrados e na parede do terrário. Para todas as análises, os moluscos foram criados em terrários plásticos vedados com tecido de algodão e elástico, contendo como substrato terra vegetal esterilizada e umedecida com água de torneira, e alimentados com ração para frangos de corte enriquecida com carbonato de cálcio. Foi verificado que a espécie ocorre no município de Juiz de Fora, Minas Gerais, possui parte mole amarelada e concha pequena e alongada, e é capaz de se reproduzir por autofecundação. Possui crescimento indeterminado, fecundidade aumentando com o tamanho corporal, iteroparidade e baixa mortalidade antes e após a maturidade sexual, não tendo o fotoperíodo efeito sobre esses padrões. As condições controladas de temperatura, umidade relativa do ar e fotoperíodo favoreceram o crescimento, maiores valores conquiliomorfométricos e o rápido alcance da maturidade sexual, enquanto a diminuição do comprimento do dia favoreceu a fecundidade. O isolamento aumentou o número total de filhotes, o número de filhotes por molusco parental e o intervalo entre eventos reprodutivos, reduziu o número de eventos reprodutivos e de filhotes por evento, e não influenciou o crescimento, o alcance da maturidade sexual, a relação crescimento-reprodução, a mortalidade e a conquiliomorfometria. O etograma foi composto por oito atos comportamentais: repousar, estar enterrado, deslocar, enterrar, explorar, alimentar, emergir e interagir. A espécie apresentou maior tendência ao repouso e a locomoção foi o ato comportamental de atividade prevalente, não apresentou horário de atividade predominantemente noturno e comportamento agregativo, e seu sítio preferido para o repouso foi o enterramento no substrato.
Knowledge of biological, morphological and behavioral characteristics of terrestrial molluscs is important for the development of pest control measures and strategies for the conservation of species. This study aimed to characterize the patterns of biology, conchiliomorphometric and behavior of the species Dysopeas muibum and check the effects of isolation and photoperiod on its life cycle and shell morphometry, under laboratory conditions. We conducted monitoring growth of the shell, release of puppies and mortality of 160 molluscs, of which 40 were kept isolated and 120 grouped (10 molluscs per group; 40 in natural conditions of temperature, relative humidity and photoperiod, and 80 with controlled conditions – 40 with long days and 40 with short days), from birth to 180 days of life, when the measures of the shell were taken. To check the schedule of activity and compose the ethogram, 30 adult molluscs (10 molluscs per group) were observed for 24 continuous hours, through the scanning method, with a record of behavioral acts at intervals of 20 minutes. For verifying the occurrence of aggregation and the preference for resting place, for five days, at 24 hour intervals, were observed in 30 adult molluscs (10 molluscs per group): number of aggregations, of aggregates and isolated individuals, and of individuals below the disc with food, below the disc without food, on the substrate, buried and in the wall of terrarium. For all analyzes, the molluscs were reared in plastic terrariums sealed with cotton fabric and elastic, containing plant soil sterile and moistened with tap water, and fed with food to broilers enriched with calcium carbonate. It was found that the species occurs in the Juiz de Fora City, MG, Brazil, has the soft yellowish and small and elongated shell, and is able to reproduce by self-fertilization. It has indeterminate growth, fecundity increases with body size, iteroparity and low mortality before and after sexual maturity, not having the photoperiod effect on these patterns. The controlled conditions of temperature, relative humidity and photoperiod favored growth, conchiliomorphometric values higher and fast reach sexual maturity, while the decrease in day length favored fecundity. The isolation increased the total number of pups, number of pups per parent mollusc and the interval between reproductive events, reduced the number of reproductive events and pups per event, and did not influence growth, reach sexual maturity, growth-reproduction relation, mortality and conchiliomorphometric. The ethogram was composed of eight behavioral acts: lie, lie buried, move, bury, explore, food, emerge and interact. The species had a greater tendency to rest and locomotion was the behavioral act prevalent activity, showed no activity time predominantly nocturnal and affiliative behavior, and their favorite place to rest was buried in substrate.
Bernadet, Philippe. « Propriétés spectroscopiques de complexes formes entre un hydracide (HCl, HBr, HI)) et l'oxyde d'éthylène (EO) en matrice d'argon et d'azote : analyse du profil de la bande d'absorption HCl des complexes H(D)Cl:EO et H(D)Cl:dimethylether et étude ». Paris 6, 1986. http://www.theses.fr/1986PA066355.
Texte intégralChua, Gordon. « The isolation and phenotypic characterization of Paramecium tetraurelia temperature-sensitive cell cycle mutants ». Thesis, 1994. http://hdl.handle.net/2429/3522.
Texte intégralSEBASTIANI, PAOLO EMIDIO. « Performance-based seismic assessment for life-cycle cost analysis of existing bridges retrofitted with seismic isolation ». Doctoral thesis, 2016. http://hdl.handle.net/11573/874444.
Texte intégralPaganini, C. « Negative affect, isolation and menstrual cycle as antecedents of eating in individuals with disordered eating : an ecological momentary assessment study ». Thesis, 2017. https://eprints.utas.edu.au/23890/1/Paganini_whole_thesis.pdf.
Texte intégralWang, Chung-Huang, et 王鐘凰. « Branched (1,3)-beta-D-Glucans Isolation Using Ethanol Fractional Precipitation, Ultra-filtration and Freeze-thaw Cycle from Ganoderma lucidum Mycelium Liquid Culture ». Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69298433124968962795.
Texte intégral國立臺灣大學
食品科技研究所
94
Polysaccharides from Ganoderma lucidum, a popular Traditional Chinese Medicine ingredient, have been associated with the antitumor, immuno-modulating and hypoglycemic activities of this mushroom. (1,3)-β-D-glucans bearing (1,6)-β-D glucosyl branches has been proved to be the major active component in the hot-water extractable polysaccharides. In this study, we employed ethanol fractional precipitation, ultra-filtration and freeze-thaw cycle techniques to separate the (1,3)-β-D-glucans from broth of mycelium liquid culture of G. lucidum. The separation was based on the properties of the (1,3)-β-D-glucans having larger molecular weight than other polysaccharides and having high tendency to aggregate. A freeze-dried powder containing 3.6% of (1,3)-β-D-glucans was used as raw material for this study. The results indicated that ethanol fractional precipitation adjusting ethanol concentration at 40% was the most efficient way, having 68.3% of recovery, among mentioned methods to purify (1,3)-β-D-glucans from a hot-water extract. The purity of the fractioned polysaccharides was 93.2% on carbohydrate basis. Increasing ethanol concentration increased both recovered quantity of the polysaccharides and the glucans but decreased the content of (1,3)-β-D-glucans. The operations of ultra-filtration using 10 kDa molecular weight cutoff (MWCO) hollow fiber membrane and freeze-thaw cycle recovered 73.5% and 34.3% of the (1,3)-β-D-glucans, respectively; the contents of the glucans were 35.3% and 14.1% on carbohydrate basis, respectively. Combination of ultra-filtration and freeze-thaw cycle could significant increase the content of (1,3)-β-D-glucans up to 69.4% with slightly lower recovery, 65.3%.
Rama, João Pedro Faria. « Eco-paineis construídos a partir de madeira e resíduos de palha/casca de arroz ». Master's thesis, 2014. http://hdl.handle.net/10316/38631.
Texte intégralPortugal enfrenta enormes desafios impostos por metas ambientais e pela atual situação económica e social da Europa. Neste contexto, a eco-edificação assume um papel importante no sector da construção. Apesar do recurso a materiais sustentáveis não ser novo, continua a existir uma enorme oportunidade tecnológica na otimização e caracterização de sistemas construtivos que potenciem o máximo benefício destes materiais. Por outro lado, há necessidade de verificar a capacidade de industrializar estas técnicas que, até ao momento, apresentam uma utilização pouco sistemática. Com este trabalho, pretendeu-se desenvolver uma solução de painel de parede inovadora (eco-painel), composta por madeira e palha ou casca de arroz, orientada para o mercado da eco-edificação. Previsivelmente, a utilização destes materiais possibilitará a definição de um produto sustentável, com impacte ambiental inferior ao de produtos concorrentes, e com propriedades de isolamento térmico e acústico adequadas. O estudo experimental foi conduzido nas instalações laboratoriais do ITeCons – Instituto de Investigação e Desenvolvimento Tecnológico em Ciências da Construção, recorrendo a um conjunto de equipamentos adequados à determinação da condutibilidade térmica e do índice de isolamento sonoro da solução construtiva. O eco-painel estudado foi também sujeito a uma avaliação de ciclo de vida. Os sistemas compostos por palha e casca de arroz foram comparados com os de soluções construtivas equivalentes constituídas por diferentes lãs de rocha, sendo os resultados obtidos indicadores de níveis de isolamento térmico e acústico adequados aos objetivos de aplicação. De salientar, ainda, que a solução construtiva estudada integra na sua estrutura subprodutos do setor agrícola, mais concretamente da região do Baixo Mondego, acrescentando assim um novo significado à ecoeficiência da solução proposta.
Portugal faces enormous challenges imposed by environmental goals and by the current economic and social situation that Europe is experiencing. In this context, the eco-edification assumes an important role in the construction sector. Although the use of sustainable materials isn’t new, still exists a huge technologic opportunity in the optimization and characterization of constructive systems that potentiates the maximum benefit of this materials. In the other hand, there is a need to verify the ability to industrialize these techniques which, until now, show a less systematic use. With this work, it was intended to develop an innovative solution of wall panel (eco-panel), composed by wood and rice straw or husk, oriented for the market of eco-edification. Predictably, the use of these materials will allow the definition of a sustainable product with an environmental impact lower than the concurrent products, and with appropriate thermic and acoustic properties. The experimental study was conducted in the laboratory facilities of ITeCons - Institute for Research and Technological Development in Construction Sciences, using a set of proper equipment for determining the thermal conductivity and sound isolation index of the constructive solution. The eco-panel study was also subject to an assessment of the life cycle. The systems composed of rice straw and rice husk systems were compared to those of an equivalent constructive solutions composed of different rock wool, and the results obtained were indicators of levels of thermal and acoustic isolation appropriate to the objectives of the application. To point, also, that constructive solution integrates in its structure sub products of the agricultural sector, more specifically of the region of “Baixo Mondego”, adding a new meaning to the eco-efficiency of the proposed solution