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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The effect of fibre volume on the mechanical properties of woven composite materials

Stepto, Simon January 1999 (has links)
No description available.
2

Efeitos da ração autoclavada sobre os aspectos quantitativos e morfométricos dos neurônios mioentéricos do jejuno de ratos em períodos de pré e pós-desmame / Effects of the autoclaved diets in the quantitative and morphometric aspects of rat’s jejunum myenteric neurons in pre and pos weaning

Gonçalez, Patrícia Orlandini 17 December 2004 (has links)
Para evitar a presença de microorganismos nas rações fornecidas para animais de laboratório, são utilizados processos de esterilização como a autoclavagem, porém esta ocasiona perda de nutrientes, como as proteínas, devido à alta temperatura usada. A deficiência protéica pode afetar a atividade celular, provocando diferentes alterações nos tecidos. Por estes fatos, objetivou-se avaliar a ação da ração autoclavada sobre os neurônios do plexo mioentérico do jejuno de ratos em período de crescimento. Para tanto, foram utilizados ratos em período dedesmame (21 dias) provindos de mães que receberam ração autoclavada ou não autoclavadadurante a gestação e lactação e ratos em período de pós-desmame (21 a 70 dias) alimentados com o mesmo tipo de dieta que as mães recebiam. Para a mensuração do perfil do corpo celular e contagem do número de neurônios por área, estes foram evidenciados pelo método de nadh-diaforase. O peso corpóreo dos animais não apresentou diferença significativa em relação ao tipo de alimentação (p > 0,05). Houve uma diminuição do comprimento jejuno-íleo em ratos alimentados com ração autoclavada (p > 0,05). O número de neurônios por área aumentou aproximadamente 10% para ratos que receberam ração autoclavada (p > 0,05). Já a área do perfil dos corpos dos neurônios apresentou um aumento para ratos alimentados com ração autoclavada, sendo este significativo para animais em período de desmame. Todos os fatores observados apresentaram diferença significativa em relação às idades / Autoclaving is the most common sterilization process to avoid the presence of pathogens in the diet of laboratory animals. However, it may cause the loss of nutrients such as proteins due to the high temperature used. The protein deficiency can affect cellular activity, leading todifferent changes in the tissues. Due to these facts, this research aimed to verify the effect of autoclaved diet in the jejunum neurons of the myenteric plexus in rats during their growing phase. The experiment groups were constituted by rats in weaning period (21 days) from mothers that received autoclaved or not diets during the gestation and lactation, and rats in post weaning period (21 to 70 days) fed the same diet the mothers received. In order to measure the neurons body profile and to quantify the number of neurons by area, they were stained by the nadh-diaphorase method. No significant changes were observed to the weight body in animals with autoclaved diet (p > 0.05). There was a decrease in the length of jejunum-ileum in rats treated with autoclaved diet (p > 0.05). The number of neurons by area increased approximately 10% in the rats supplied with autoclaved diet (p > 0.05). The neuron body profile area increased in the rats that received autoclaved diet and it was significant in the animals in weaning period. Nevertheless, all factors observed showed significant differences when related to animal age
3

Estudo das atividades biológicas de frações proteicas do feijão comum (Phaseolus vulgaris) cultivar pérola / Study of the biological activities of protein fractions of common bean (Phaseolus vulgaris) cultivar pérola

Ribeiro , Juliana Vila Verde 30 June 2017 (has links)
Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-03-19T13:01:54Z No. of bitstreams: 2 Dissertação - Juliana Vila Verde Ribeiro - 2017.pdf: 1977423 bytes, checksum: dfe4356d4cc652b62373f0d9cbd5642a (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-03-20T10:15:35Z (GMT) No. of bitstreams: 2 Dissertação - Juliana Vila Verde Ribeiro - 2017.pdf: 1977423 bytes, checksum: dfe4356d4cc652b62373f0d9cbd5642a (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-03-20T10:15:35Z (GMT). No. of bitstreams: 2 Dissertação - Juliana Vila Verde Ribeiro - 2017.pdf: 1977423 bytes, checksum: dfe4356d4cc652b62373f0d9cbd5642a (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-06-30 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Common bean (Phaseolus vulgaris) is considered a nutraceutical food, because it has bioactive compounds, such as peptides. These peptides have several biological activities, such as chelating, antioxidant, anticancer, antihypertensive and other activities. Thus, this study aimed to assess the bioactivity of protein fractions of common bean (Phaseolus Vulgaris) cultivar Pérola. In this work the flour obtained from the peeled beans freshly harvested beans, hardened and hardened autoclaved were evaluated as a source of bioactive peptides. Four solutions were used for the production of extracts: acetonitrile/water/formic acid, sodium acetate, Ammonium bicarbonate and alkaline pH 8.0 solubilization. In the extracts and the protein fractions were measured the protein content, antioxidant activity tests with DPPH (2.2-diphenyl-1-picrilhidrazil), chelating activity of iron and copper. 1 extract was chosen to give the segment next steps for presenting greater bioactivity, thus he was submitted to fractionation by ultrafiltration in 10 kDa membrane, where verified your bioactivity, resistance to thermal treatment and the stability of the Chelation complex formed from iron and peptide gastric conditions. And was rated the content of antinutritional factors in the extracts submitted to heat treatment. These tests found that the bean plant presented greater biological activities tested than other beans. In tests with the protein fractions found that the peptides present bioactivity and are and resistant to heat treatment, and to form complex is resistant gastric conditions chelators. Observed that the thermal treatment reduces the amount of antinutritional factors. In vivo studies showed that despite being the iron complex-peptide to be stable gastric conditions, the system was not able to pass through the membrane of enterocytes, being totally eliminated by the feces. This work contributed to expand the study of bioactive compounds present in wastes from agro-industry, in order to guide the proper use and the best way to explore the nutraceutical potential of this legume. / O feijão comum (Phaseolus vulgaris) é considerado um alimento nutracêutico, por apresentar compostos bioativos, como por exemplo, os peptídeos. Estes peptídeos apresentam diversas atividades biológicas, tais como atividade quelante, antioxidante, anticancerígena, anti-hipertensiva e outras. Deste modo, este estudo objetivou avaliar a bioatividade de frações proteicas de feijão comum (Phaseolus Vulgaris) cultivar Pérola. Neste trabalho as farinhas obtidas dos grãos descascados de feijões recém-colhidos, endurecidos e endurecidos autoclavados foram avaliadas como fonte de peptídeos bioativos. Foram utilizadas quatro soluções para produção dos extratos: acetonitrila/ água/ ácido fórmico, acetato de sódio, bicarbonato de amônio e solubilização alcalina pH 8,0. Nos extratos e nas frações proteicas foram dosados o teor de proteínas, testes de atividade antioxidante com DPPH (2,2-difenil-1-picrilhidrazil), atividade quelante de ferro e de cobre. O extrato 1 foi escolhido para dar segmento às próximas etapas por apresentar maior bioatividade, deste modo ele foi submetido a fracionamento por ultrafiltração em membrana de 10 kDa, onde verificou sua bioatividade, resistência ao tratamento térmico e a estabilidade do complexo quelante formado a partir de ferro e peptídeo às condições gástricas. E foi avaliado o teor de fatores antinutricionais nos extratos submetidos ao tratamento térmico. Nestes testes o feijão autoclavado apresentou maiores atividades biológicas testadas do que os demais feijões. Nos testes com as frações proteicas observou-se que os peptídeos apresentaram bioatividade e foram resistentes ao tratamento térmico, e ao formar complexos quelantes são resistentes às condições gástricas. Observou-se que o tratamento térmico reduziu a quantidade de fatores antinutricionais. Os estudos in vivo evidenciaram que apesar do complexo ferro-peptídeo ser altamente estável às condições gástricas, o sistema não foi capaz de passar pela membrana dos enterócitos, sendo totalmente eliminado pelas fezes. Este trabalhou contribuiu para ampliar o estudo dos compostos bioativos presentes em resíduos da agroindústria, com intuito de nortear o uso adequado e o melhor caminho para se explorar o potencial nutracêutico desta leguminosa.
4

Efeitos da ração autoclavada sobre os aspectos quantitativos e morfométricos dos neurônios mioentéricos do jejuno de ratos em períodos de pré e pós-desmame / Effects of the autoclaved diets in the quantitative and morphometric aspects of rat’s jejunum myenteric neurons in pre and pos weaning

Patrícia Orlandini Gonçalez 17 December 2004 (has links)
Para evitar a presença de microorganismos nas rações fornecidas para animais de laboratório, são utilizados processos de esterilização como a autoclavagem, porém esta ocasiona perda de nutrientes, como as proteínas, devido à alta temperatura usada. A deficiência protéica pode afetar a atividade celular, provocando diferentes alterações nos tecidos. Por estes fatos, objetivou-se avaliar a ação da ração autoclavada sobre os neurônios do plexo mioentérico do jejuno de ratos em período de crescimento. Para tanto, foram utilizados ratos em período dedesmame (21 dias) provindos de mães que receberam ração autoclavada ou não autoclavadadurante a gestação e lactação e ratos em período de pós-desmame (21 a 70 dias) alimentados com o mesmo tipo de dieta que as mães recebiam. Para a mensuração do perfil do corpo celular e contagem do número de neurônios por área, estes foram evidenciados pelo método de nadh-diaforase. O peso corpóreo dos animais não apresentou diferença significativa em relação ao tipo de alimentação (p > 0,05). Houve uma diminuição do comprimento jejuno-íleo em ratos alimentados com ração autoclavada (p > 0,05). O número de neurônios por área aumentou aproximadamente 10% para ratos que receberam ração autoclavada (p > 0,05). Já a área do perfil dos corpos dos neurônios apresentou um aumento para ratos alimentados com ração autoclavada, sendo este significativo para animais em período de desmame. Todos os fatores observados apresentaram diferença significativa em relação às idades / Autoclaving is the most common sterilization process to avoid the presence of pathogens in the diet of laboratory animals. However, it may cause the loss of nutrients such as proteins due to the high temperature used. The protein deficiency can affect cellular activity, leading todifferent changes in the tissues. Due to these facts, this research aimed to verify the effect of autoclaved diet in the jejunum neurons of the myenteric plexus in rats during their growing phase. The experiment groups were constituted by rats in weaning period (21 days) from mothers that received autoclaved or not diets during the gestation and lactation, and rats in post weaning period (21 to 70 days) fed the same diet the mothers received. In order to measure the neurons body profile and to quantify the number of neurons by area, they were stained by the nadh-diaphorase method. No significant changes were observed to the weight body in animals with autoclaved diet (p > 0.05). There was a decrease in the length of jejunum-ileum in rats treated with autoclaved diet (p > 0.05). The number of neurons by area increased approximately 10% in the rats supplied with autoclaved diet (p > 0.05). The neuron body profile area increased in the rats that received autoclaved diet and it was significant in the animals in weaning period. Nevertheless, all factors observed showed significant differences when related to animal age
5

Aplicações biotecnológicas de feijões endurecidos / Biotechnological aplications of hardened beans

Batista, Karla de Aleluia 16 September 2014 (has links)
Submitted by Luanna Matias (lua_matias@yahoo.com.br) on 2015-02-03T18:03:27Z No. of bitstreams: 2 Tese - Karla de Aleluia Batista - 2014.pdf: 4463046 bytes, checksum: 859650f3ccfef17ceeaddf20db728272 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-02-04T13:59:39Z (GMT) No. of bitstreams: 2 Tese - Karla de Aleluia Batista - 2014.pdf: 4463046 bytes, checksum: 859650f3ccfef17ceeaddf20db728272 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-02-04T13:59:39Z (GMT). No. of bitstreams: 2 Tese - Karla de Aleluia Batista - 2014.pdf: 4463046 bytes, checksum: 859650f3ccfef17ceeaddf20db728272 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2014-09-16 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Beans are legumes that present high content of protein, which make them one of the most important sources of nutrients in Brazil. Despite their excellent nutritional profile, changes in biochemical and physico chemical properties during storage leads to the hardening of grains, which compromise their texture and palata bility. It is known that bean’s hardening is responsible for losses about of 100.000-500.000 ton of beans per year. In addition, considering that per capita intake of beans in Brazil was 16 Kg/person/year, the content of discharged grains as function of hardening could feed 34 million of Brazilian. In this scenario, several processes have been tested aiming to provide na alternative of inclusion for these residues. In this work, hardened beans from gen us Phaseolus (Phaseolus vulgaris) and Vigna (Vigna unguiculata) were treated by autoclaving and extrusion and the products were tested regarding their applicability in biotechnological area. The extruded beans presented nutritional and technological properties that allowed their use as ingredients in bread production. Results evidenced that breads made using a mixture of extruded bean and wheat flours presented 10% higher protein and 2.5-hold higher fiber than breads made with 100% wheat flour. These results indicate that extruded bean flours constitute ingredie nts nutritionally and economically viable for technological application in breads elaboration, conferring improvement of nutritional characteristics without changing sensory attributes. The extruded hardened beans were also used as ingredient of culture me dium replacing the traditional nitrogen sources. Results evidenced that the use of extruded cowpea (Vigna unguiculata) flour is not promising since the optical density of microorganisms grown in culture medium containing extruded cowpea was 20% lower than the optical density observed in commercial media. On the other hand, the microorganisms grown in media containing extruded common bean (Phaseolus vulgaris) presented higher values of optical density and protein expression when compared to commercial broths. Alternatively, the grains were treated by autoclaving, with perspective of use the whole grain. Results evidence that after autoclaving the hardness of grains remained high, which disable their use of whole grain. However, the autoclaving process improve d the nutritional quality without modifying the technological properties. Finally, results evidenced that each genus presented a different behavior after treatment by extrusion or autoclaving. Thus, it is evident that the type and conditions processing use dwill depend of bean characteristics as well as the properties required to the proposal application. / O feijão é uma leguminosa com importante papel na nutrição humana, sendo uma das principais fontes de proteínas na alimentação dos brasileiros. Entretanto, as alterações pós-colheita que ocorrem durante o armazenamento ocasionam o endurecimento do grão, que perde suas características de textura e palatabilidade. Estima-se que o endurecimento ocasione perdas de 100-500 mil toneladas deste grão ao ano. Considerando que o consumo per capita de feijão em 2013 foi estimado em 16 Kg por habitante ao ano, as perdas relacionadas ao endurecimento alimentariam aproximadamente 34 milhões de brasileiros. Neste cenário, diversas alternativas têm sido testadas no intuito de reaproveitar os grãos endurecidos. Neste trabalho, feijões endurecidos dos gêneros Phaseolus (Phaseolus vulgaris) e Vigna (Vigna unguiculata) foram tratados por extrusão e autoclavagem no intuito de se estudar as possíveis aplicações dos produtos gerados.Os feijões extrusados apresentaram características nutricionais e tecnológicas que permitiram sugerir sua aplicação como ingrediente na formulação de pães e como fonte de nitrogênio para composição de meios de cultura. A utilização de farinhas mistas de feijão extrusado e trigo originou pães com 10% mais proteínas e 2,5 vezes mais fibras do que os pães produzidos apenas com farinha de trigo. Estes resultados evidenciaram que as farinhas de feijão extrusado constituem ingredientes nutricionalmente e economicamente viáveis para a aplicação tecnológica na elaboração de pães, melhorando as características nutricionais sem alterar os atributos sensoriais. As farinhas de feijão extrusado também foram utilizadas como fonte de nitrogênio em meios de cultura, avaliando-se o efeito da substituição na taxa de crescimento e expressão de proteínas. Os resultados evidenciaram que o uso de feijão caupi (Vigna unguiculata) extrusado não é uma alternativa promissora para o cultivo de bactérias, uma vez que os valores de densidade óptica foram 20% inferiores àqueles apresentados em meio comercial. Por outro lado, o feijão comum (Phaseolus vulgaris) extrusado mostrou-se uma eficiente fonte de nutrientes para o crescimento de bactérias e leveduras. Além disso, o uso de meios de cultura contendo feijão comum melhorou a taxa de produção de proteínas recombinantes tanto em bactérias, quanto em leveduras. Os grãos de feijão caupi e comum endurecidos também foram tratados por autoclavagem no intuito de se avaliar a possibilidade de reinclusão do grão inteiro na alimentação. Os resultados encontrados evidenciaram que, apesar dos valores de dureza não permitirem a reinclusão dos grãos inteiros na alimentação, a autoclavagem melhorou as características nutricionais dos feijões endurecidos, enquanto preservou suas propriedades tecnológicas. Por fim, os resultados obtidos neste trabalho evidenciar am que cada espécie de feijão apresenta um comportamento distinto frente a cada condição de processamento, seja por autoclavagem, seja por extrusão. Diante disso, fica evidente que o tipo e as condições de processamento a serem escolhidos dependerão da espécie de feijão utilizada e das propriedades requeridas para cada aplicação proposta.
6

Řídicí systém autoklávovacího procesu / Control system of the concrete batch process

Macej, Maroš January 2012 (has links)
The work presents a control system for energy savings using the recycling of steam in autoclaving process of porous blocks. This work describes a manufacturing process of porous. The control system is based on programmable controllers from Siemens series S7-300, then is applied to the TIA Portal software for the programming of these units. Lastly, the work comprises of process simulation, control system and its subsequent visualization.
7

Comparison of Pre- and Post-treatments of Sugarcane Industry By-products to Increase Biomethane Production

Huang, Baitong January 2020 (has links)
Even though the Brazilian ethanol and sugar production system (based on sugarcane industry) have been providing large amounts of bioenergy, the extensive amounts of organic wastes generated cannot be ignored when it comes to sustainability. Using these biomasses to produce biomethane through anaerobic digestion has been proven as a promising way to tackle this issue. This study investigated the biomethane potential of the co-digestion of these biomasses: SF (sugarcane straw : filter cake = 8:2), SFV (sugarcane straw : filter cake : vinasse = 1:4:45), and D (digestate separated from AD of SFV). Three treatments autoclaving (AU), alkaline (AL) treatment using 6% (w/w) NaOH and the combination of these two (AUAL) were then conducted on SF and SFV as pre-treatments; on D as post- treatments. In the biomethane potential tests of untreated material, the highest methane yield was achieved by SFV with 275.28 ± 11 N ml CH4/g VS, followed by SF with 223.25 ± 10 N ml CH4 g-1 VS, substrate D also resulted in a methane potential of 144.69 ± 2 N ml CH4 g-1 VS. As pre-treatments, AL and AUAL both showed increase in methane yield (between 36.0% and 49.1%) and methane production rate. As post-treatments, AU, AL and AUAL showed distinctive results in methane production, with 33.8%, 99.8% and 128.8% increase, respectively. In comparison with pre-treatment, post-treatment showed a better performance in increasing methane production. The following feeding experiments performed in continuous stirred-tank reactors showed that AL treatment led to an average of 248% increase in methane yield. / Sugarcane waste: towards a zero C emission in the Brazilian bioenergy sector
8

Příprava pórobetonu pro tepelně izolační účely / The preparation of cellular concrete for insulating purposes

Koutný, Ondřej January 2014 (has links)
In these days of economic crisis subsiding, in the civil engineering the attention is pointed especially to the systems, which effectively reduce energy and decrease costs associated with using of residential or industrial premises. Especially the heat-insulating systems are mentioned, because of their characteristics and construction which will be applied economical solutions. It is possible to use the materials based on aerated concrete which excel within construction materials due to its heat-insulating properties. The use of this material for clearly heat-insulations seems to be fully-fledged alternative to standard heat-insulating systems also due to combination of nature character and sufficient strength. This work deals with possibility of preparation non-bearing, heat-insulating material based on autoclaved aerated concrete with volume weight under 200 kg/m3.
9

Problematika výroby nového popílkového pórobetonu / The issue of new fly ash aerated concrete production

Bednárik, Vít January 2014 (has links)
The master´s thesis deals with the possibility of laboratory verification of the influence of feedstock character, especially lime and fly ash, on quality of fly ash aerated concrete. The experimental study involves taking a series of samples autoclaved and non-autoclaved aerated concrete during two pilot plant verification in the factory. After removal of autoclaved and non-autoclaved aerated concrete samples they were tested and compared with results of non-autoclaved aerated concrete produced in the laboratory. Methodology of comparison technologically-produced autoclaved aerated concrete and laboratory-produced non-autoclaved aerated concrete was designed based on achieved findings.
10

Vývoj nové technologie pískového pórobetonu s využitím druhotných surovin / Development of new technology of sand autoclaved aerated concrete with using of secondary raw materials

Ondříčková, Pavlína January 2018 (has links)
Autoclaved sand aerated concrete is a modern building material with high thermal insulation properties. Only sand is used as the primary silicate component of aerated concrete in the Czech Republic. For the more favourable economic and ecological properties of aerated concrete, the use of secondary raw materials is used in this work. The secondary raw materials examined included fluidized bed and fly ash, slag and glass recycled. The aerated concrete composite with secondary admixtures was developed under hydrothermal conditions of a laboratory autoclave for 7 and 12 hours at 190°C. From the secondary raw materials tested, a 10% glass recycler additive yielded the highest strength. Other additives that have a positive effect on mechanical properties include SAKO and Oslavany. From the results of the work it is evident that the use of secondary raw materials increases the strength, improves the rheology of the mixture and supports the formation of tobermorite.

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