• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 18
  • 12
  • 3
  • 2
  • 2
  • 1
  • Tagged with
  • 45
  • 10
  • 7
  • 7
  • 7
  • 7
  • 6
  • 6
  • 5
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • 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.
41

Caracterização de cultivares de feijão para pré- de grãos desidratados de cozimento rápido e processamento industrial / Characterization of bean cultivars for preprocessing of dehydrated quick-cooking grains and industrial canning

Schoeninger, Vanderleia 26 October 2015 (has links)
Made available in DSpace on 2017-05-12T14:47:17Z (GMT). No. of bitstreams: 1 Tese revisada_ (Vanderleia) 29 10 2015.pdf: 2119451 bytes, checksum: 2a331a8e454522cd4dc600544af51cd4 (MD5) Previous issue date: 2015-10-26 / Currently an alternative that meets the demands of the modern consumer is the industrial processing. Due to the necessity of scientific materials about beans industrial processing in the national literature, then the objective in the first stage of this work (Paper 1) was prepare a review about this topic. Were presented some concepts and details of the industrial processing, unit operations and quality parameters evaluated in canned beans. In sequence (Paper 2) were presented the results of the study that evaluated the adaptability of eight bean cultivars for industrial processing. Cultivars evaluated were by commercial Carioca class: BRS Perola, BRS Estilo, BRS Ametista e BRS Notável and also the Black class: IPR Uirapuru, BRS Campeiro, BRS Esteio and BRS Esplendor. First the physical parameters of the grains were evaluated: water content, measurement of the size, roundness, weight of 100 seeds, density, bulk density, apparent moisture ratio and color components. Then the beans were processed at an industry of canning, using cans with a capacity of 420 g, in which the samples were put without the use of soaking. For sauce was used water at a temperature of 75°C and the cooking process and sterilization was performed in a rotary retort. The quality parameters were evaluated in canned beans: total, net and drained weight, headspace, damage index, color, soluble solids and total solids in the sauce, texture, acidity and pH. Data were submitted to multivariate analysis: Principal Components and Hierarchical Clustering. As a result it was found that the Carioca class BRS Estilo differs from others due to low drained weight that contributed to the increase of total solids in the broth, with low hardness values, not adapting to the type of process used in this experiment. In Black class were observed similar quality characteristics between cultivars BRS Esplendor and IPR Uirapuru, and between BRS Campeiro and BRS Esteio, especially this last one by having smaller index of damaged grains after processing. Lastly, in the last work (Paper 3) was presented information about a different option of product by beans, the quick cooking dehydrated, pointing details of the processing and the performance of Brazilian bean varieties, as well as the technological quality of the final product. In the processing of quick-cooking dried beans was used a Central Composite Design (CCD) with two factors. The first factor was cultivar, evaluating BRS Pérola, BRS Madrepérola, BRS Estilo and IAPAR 81. The second factor was concentration of NaHCO3 used in soaking operation followed by drying of the beans. Were evaluated the parameters: cooking time, damage index and color difference in the processed product. It was found that the effects on these quality parameters are dependent upon the cultivar factor, because BRS Estilo and BRS Madrepérola stood out due to reduced cooking time and color difference when compared to BRS Pérola and IAPAR 81. For BRS Estilo cultivar the increased of NaHCO3 concentration in the soaking reduced significantly the cooking time, with lower rates of damage when compared to BRS Madrepérola. Finally, the information in this work intends to contribute with future research on this topic and therefore increase the bean consumption, whether in the form of an innovative product like the quick cooking dehydrated or as canned beans. / Atualmente uma alternativa alimentar que atende às demandas do consumidor moderno é o processamento industrial do feijão. Devido à necessidade de materiais científicos sobre processamento industrial do feijão na literatura nacional, objetivou-se na primeira etapa deste trabalho (Artigo 1) elaborar uma revisão de literatura sobre o tema. São apresentados alguns conceitos e detalhes do processamento industrial, das operações unitárias e dos parâmetros de qualidade avaliados no feijão enlatado. Na sequência (Artigo 2), apresentam-se os resultados do trabalho que avaliou a adaptabilidade de oito cultivares de feijão ao processamento industrial. Foram avaliados cultivares da classe comercial Carioca: BRS Pérola, BRS Estilo, BRS Ametista e BRS Notável; da classe Preto: IPR Uirapuru, BRS Campeiro, BRS Esteio e BRS Esplendor. Primeiramente, foram verificados os parâmetros físicos nos grãos: teor de água, aferição das dimensões, esfericidade, massa de 100 grãos, densidade, massa específica aparente, coeficiente de hidratação e componentes de cor. Em seguida, os grãos foram processados em uma indústria do setor, utilizando-se embalagens metálicas com capacidade de 420 g, nas quais as amostras foram acondicionadas sem o emprego de hidratação prévia. Como calda, utilizou-se água na temperatura de 75 °C e o processo de cozimento e esterilização foi realizado em autoclave rotativa. No feijão enlatado, avaliaram-se os parâmetros de qualidade: peso bruto, líquido e drenado, altura de headspace, índice de danos, cor, sólidos solúveis e sólidos totais no caldo, textura, acidez e pH. Os dados foram submetidos à análise multivariada: componentes principais e de agrupamento. Como resultado, verificou-se que, na classe Carioca, o cultivar BRS Estilo diferencia-se dos demais, devido ao baixo peso drenado que contribuiu para o aumento de sólidos totais no caldo, com baixos valores de dureza, não se adaptando ao tipo de processo utilizado neste experimento. Na classe Preto, observaram-se características de qualidade semelhantes entre BRS Esplendor e IPR Uirapuru, e entre BRS Esteio e BRS Campeiro, destacando-se esta última por apresentar menores índices de grãos danificados após o processamento. Por fim, no último trabalho (Artigo 3), apresentam-se informações sobre uma opção diferenciada de produto derivado do feijão, o desidratado de cozimento rápido, apontando-se detalhes sobre o processamento e a performance de diferentes cultivares brasileiros, assim como a qualidade tecnológica. No processamento do feijão desidratado de cozimento rápido foi empregado um delineamento composto central (DCC) com dois fatores. O primeiro fator foi cultivar, avaliando-se BRS Pérola, BRS Madrepérola, BRS Estilo e IAPAR 81; o segundo fator foi a concentração de NaHCO3 (bicarbonato de sódio) empregado na hidratação, seguida da secagem dos grãos. Foram avaliados os parâmetros tempo de cozimento, índice de dano e diferença de cor no produto processado. Verificou-se que os efeitos nos parâmetros de qualidade são dependentes do fator cultivar, visto que BRS Estilo e BRS Madrepérola destacaram-se devido ao menor tempo de cozimento e diferença de cor, quando comparados ao BRS Pérola e IAPAR 81. Para BRS Estilo, o aumento na concentração de NaHCO3 reduz significativamente o tempo de cozimento, com menor índice de dano quando comparado ao cultivar BRS Madrepérola. Por fim, com as informações presentes neste trabalho pretende-se contribuir com pesquisas futuras sobre o tema e dessa forma incrementar o consumo do feijão, seja na forma de um produto inovador como o desidratado de cozimento rápido ou na forma de enlatado.
42

Validação de métodos para teste de germinação em sementes de espécies florestais da família Fabaceae

Pereira, Vanderley José 28 June 2012 (has links)
Conselho Nacional de Desenvolvimento Científico e Tecnológico / CHAPTER II: The standardization of inter-laboratory results of germination test of forest species seeds requires that the methods be robust and subject to low variability. Therefore, the objective was to compare and discuss different forms of the coefficient of variation for normal seedlings in the method validation process for testing germination of seeds of 20 species of the Fabaceae family. Coefficients of variation for the experiment by lot and by laboratory were calculated for normal seedlings from the statistical analysis of method validations. For normal seedlings of 20 Brazilian forest species, the coefficients of variation were low (up to 9.84%), to average (up to 17.66%), contrary to expectations due to high genetic variability in these barely improved species. The increase of the coefficient is not related to treatment for breaking dormancy, but it grows as the lot quality decreases. The high coefficients by laboratory, overestimated by the lot effect, are uniform indicating that the methods are repeatable. The coefficient is not an indicator capable of predicting the heterogeneity of model variance. As normal distribution models random events, randomness is present in the validation process of the 20 forest species of the Fabaceae family. CHAPTER III: There are many treatments to overcome dormancy. However, descriptions of the consequences of these methods in seedling development are scarce. Because of the relevance of Fabaceae family in the context of dormancy seeds, seedlings and seeds of 10 forest species were evaluated quantitatively and qualitatively as to damage and infections caused by invasive treatments. Scarification, cutting and preheat methods were applied to seeds. They were then sampled was arranged in germitest, forming rolls distributed in a germination boxes under continuous fluorescent white light at 25 °C. Root protrusion used as the sole criterion, overestimates the efficiency of germination treatments to overcome dormancy. Scarification and cutting are efficient for Enterolobium contortisiliquum, Parkia pendula, Senna multijuga and Senna macranthera seeds, as well as cutting for Mimosa caesalpiniaefolia seeds. However, they are inefficient for Dimorphandra mollis and Enterolobium maximum because of the increase in the percentage of infected seedlings, and to Stryphnodendron adstringens, for dead seeds. The high percentage of damaged seedlings of Erythrina velutina and Erythrina speciosa cannot be attributed solely to treatment, because without pretreatment the root system gets strapped, forming a loop. The preheat treatment is inefficient because it results in a high percentage of hard seeds remaining. / CAPÍTULO II: A uniformização dos resultados inter laboratoriais de testes de germinação de sementes de espécies florestais exige que os métodos sejam robustos e sujeitos à baixa variabilidade. Assim, o objetivo foi comparar e discutir as diferentes formas de cálculo do coeficiente de variação para plântulas normais do processo de validação de métodos para teste de germinação de sementes de 20 espécies da família Fabaceae. Os experimentos de germinação de sementes para todas as espécies incluindo tratamentos pré-germinativos, tempos de contagem, substrato, temperatura e fotoperíodo foram validados com base no Manual de Validação da Associação Internacional para Teste de Sementes. Coeficientes de variação para o experimento, por lote e por laboratório para plântulas normais foram calculados, a partir das análises estatísticas previstas para a validação dos métodos, como exclusão de valores discrepantes, testes para as pressuposições do modelo e análise de variância. Para plântulas normais de 20 espécies florestais nativas, os coeficientes de variação foram de baixos (até 9,84%) a médios (até 17,66%), contrariando o esperado pela grande variabilidade genética dessas espécies pouco melhoradas. O aumento do coeficiente de variação não está relacionado ao tratamento de superação de dormência, porém cresce à medida que a qualidade do lote decresce. Os altos coeficientes de variação estimados por laboratório, superestimados pelo efeito de lotes, são uniformes indicando que os métodos são reproduzíveis. O coeficiente não é um indício capaz de predizer a heterogeneidade das variâncias e, consequentemente, a necessidade de transformação dos dados. Como a distribuição normal modela eventos aleatórios, a aleatoriedade está presente no processo de validação de métodos das 20 espécies da família Fabaceae, justificada pela distribuição normal dos resíduos. CAPÍTULO III: Muitos são os tratamentos descritos na literatura para superação da dormência de sementes, porém as consequências dos procedimentos no desenvolvimento das plântulas são raramente descritas. Pela relevância da família Fabaceae no contexto dos tratamentos para superação da dormência, plântulas e sementes de 10 espécies foram avaliadas quantitativamente e qualitativamente com o objetivo de determinar danos e infecções causados por tratamentos invasivos. Após revisão de literatura foram escolhidos métodos considerados eficientes para cada espécie. Experimentos foram conduzidos em delineamentos de blocos ao acaso e inteiramente casualizados, com sementes dispostas em papel germitest, com rolos dispostos em câmara de germinação sob luz branca fluorescente contínua a 25 ºC. Após a análise estatística selecionou-se o método que promoveu as maiores germinabilidades, maiores percentuais de plântulas normais, menores de anormais e de sementes mortas e duras, juntando-se outro relacionado ao mesmo procedimento e o tratamento térmico. A protrusão da raiz quando usado como critério único de germinação superestima a eficência dos tratamentos de superação da dormência de sementes de Fabaceae, porém é um indicador eficiente do potencial germinativo. A escarificação e o desponte são tratamentos eficientes de superação de dormência de sementes de Mimosa caesalpiniaefolia, Parkia pendula, Senna macranthera e Senna multijuga quando precedidos e seguidos pela assepsia com hipoclorito de sódio. Contudo, são ineficientes para sementes de Dimorphandra mollis e Enterolobium maximum pelo aumento dos percentuais de plântulas anormais infeccionadas e, para sementes de Stryphnodendron adstringens, pelo aumento dos percentuais de sementes mortas. Em Erythrina speciosa e Erythrina velutina os altos percentuais de plântulas anormais danificadas registrados a partir de sementes escarificadas e despontadas, não podem ser atribuídos exclusivamente aos tratamentos. A anormalidade causada pelo sistema radicular que fica preso no tegumento e enovela também é muito frequente em sementes sem qualquer pré-tratamento; O tratamento térmico úmido é ineficiente na superação de dormência de sementes de Fabaceae, mesmo com embebição posterior, pela desuniformidade pelos altos percentuais de sementes duras ao final do teste. / Mestre em Agronomia
43

Zdravotně technické a plynovodní instalace v předškolním zařízení / Sanitation installations and gas installations in Preschool

Műller, Martin January 2018 (has links)
The thesis deals with the technical and gas installation with the use of precipitation water in pre-school facilities. The theoretical part deals with fat traps. The experimental part is focused on water flows, pre-school facilities. In the design and calculation part are drafted sewerage, water supply, gas pipeline, use of rain water and connection of the building to utility networks. The thesis was elaborated according to current standards, laws and decrees
44

Pratiques traditionnelles, valeur alimentaire et toxicité du taro (Colocasia esculenta L. SCHOTT) produit au Tchad / Traditional technologies, nutritive value and of toxicity of taro (Colocasia esculenta L.SCHOTT) produced in Chad

Soudy, Imar Djibrine 08 September 2011 (has links)
Le taro (Colocasia esculenta L SCHOTT) est un tubercule d’une grande importance alimentaire au Tchad pour la consommation humaine et animale. La littérature sur les pratiques culturales et les technologies traditionnelles post-récolte des variétés tchadiennes demeure presque inexistante. Une enquête a donc été menée dans la région du Mayo-Kebbi (Tchad) où le taro est très cultivé. Il résulte qu’il existe principalement deux variétés de taro au Tchad : la variété « Gouning souol» ou variété locale qui est caractérisée par une âcreté importante et un temps de cuisson prolongé (6 à 8 h). Ces propriétés ont entraîné l’abandon de la culture de cette variété au profit de la variété « Gouning sosso » qui présente une âcreté moindre et un temps de cuisson plus court (45 à 60 minutes). Une technique traditionnelle pour réduire l’âcreté et diminuer le temps de cuisson consiste à tremper les tranches de taro frais soit dans l’eau, soit dans une solution de trempage de maïs ou soit dans une infusion de tamarin pendant 24 à 48 h selon l'intensité de l'âcreté. Après séchage au soleil, les cossettes sèches sont transformées en farine. Ces produits de transformation servent à la préparation de boules de pâtes, de bouillie, de soupes ou de beignets. Des analyses ont été effectuées sur une gamme d’échantillon de farine de taro produite conformément à la recette artisanale dans l’optique de comprendre l’effet de cette technologie traditionnelle. Des cossettes fraîches de taro ont été trempées pendant 0, 1 h, 3 h, 6 h, 12 h et 24 h dans de l’eau, ou dans une solution de trempage de maïs ou dans une infusion de tamarin. Chaque échantillon a ensuite été séché au soleil pendant 48 h puis broyé en farine. La matière sèche, les protéines brutes, les cendres, les fibres brutes, les macroéléments minéraux et oligoéléments ont été évalués dans le but de déterminer les effets du trempage traditionnel sur le profil nutritionnel du taro. La digestibilité in vitro de l’amidon sous l’action de l’α-amylase et la teneur en oxalates de différentes farines de taro ont été également déterminées. Il ressort de ces analyses que seul le trempage dans une infusion de tamarin a induit une baisse significative (P < 0,001) de la teneur en protéines brutes (de 3,26 % pour T0 à 2,68 % pour le traitement au tamarin à T24). L’infusion de tamarin n’a pas modifié la teneur en fibres brutes alors que les autres traitements l’ont assez significativement diminuée (P < 0,001). Toutes les méthodes de trempage ont entraîné une diminution significative des teneurs en minéraux, à l’exception d’une augmentation des teneurs en sodium (due à la qualité de l’eau des préparations) et en phosphore (probablement due à l’hydrolyse des phytates du maïs). Une perte significative en fer a été constatée passant de 144 mg/kg de MS (témoin) à 78 mg/kg de MS (échantillon traité à l’eau pendant 12 h), soit une perte de 45,83 %. La plus faible diminution de taux de fer est observée dans le cas de l'échantillon trempé dans l'infusion de tamarin avec une perte maximale de 31,25 % après 24 h. La teneur en zinc ne varie pas. Les procédés de trempage entraînent globalement une amélioration de la digestibilité du taro après une simple cuisson (95°C pendant 30 minutes) qui passe de 39,30 % (échantillon témoin non trempé) à 78,67 % pour le taro trempé dans l’eau. Après 3 h de trempage, la farine de taro traitée par la solution de maïs est significativement plus digestible (77,12 %) que les échantillons résultant de deux autres traitements [tamarin (60,86 %), eau (60,45 %)] qui sont statistiquement similaires. (...) / Colocasia esculenta L SCHOTT is a valuable tuber widely consumed in Chad by humans and livestock. There is very little available literature about the cultivation and the post-harvest traditional technologies of the Chadian varieties of taro. A survey was carried out in the Mayo-Kebbi region ( Chad) where taro is a widely cultivated. There are two main varieties of taro in Chad : the " Gouning souol " variety, a local variety characterized by an important level of acridity and the prolonged cooking time (6 to 8 hours). The presence of these properties led to the replacement of the cultivation of this variety by the " Gouning sosso " variety which presents a lower level of acridity and a shorter cooking time (45 to 60 minutes). A traditional process to reduce the acridity and decrease the cooking time consists in dipping the slices of fresh taro in the water, or in a corn solution or in a tamarind infusion for a period of 24 to 48 hours according to the intensity of the acridity. After drying in the sun, the dried chips are ground into flour. This flour is then used to prepare mixtures of porridge, soups and cakes. Analyses were carried out on samples of taro flour produced in accordance with the traditional methods of soaking to determine the effects of this traditional process. Fresh taro chips were dipped over a period of 0, 1, 3, 6, 12 and 24 hours in the water, or in the corn infusion or in the tamarind infusion. Each sample was then dried in the sun for 48 hours and ground into flour. Dry matter, crude protein, ash, crude fiber, minerals and various trace elements were assessed. The in vitro digestibility of taro starch using α-amylase enzyme and the amount of total oxalates in the different taro flour were also determined. The soaking in the tamarind infusion induced a significant (P < 0.001) decrease in protein content (from 3.26 % for the control sample to 2.68 % for the treatment with the tamarind infusion at T24). The other treatments (corn solution and water) reduced also the protein level of taro but not significantly. The crude fibre content was not affected by the tamarind infusion but decreased significantly in the other treatments at the threshold level of 5 %. All methods of soaking led to a significant decrease of the mineral contents, except for an increase in sodium (due to the quality of the water used to prepare solutions) and in phosphorus (probably due to the hydrolysis of phytates by the corn infusion). A significant loss in trace element (Iron) was observed, decreasing from 144 mg / kg of DM (control sample) to 78 mg / kg of DM (after 12 hours of water soaking) corresponding to a loss of 45.83 %. The lowest decrease in iron level was observed after the treatment by the tamarind infusion (31.25 % after 24 hours). All the soaking processes were seen to have improved the digestibility of taro flour. By simply cooking (at a temperature of 95°C for 30 minutes), the in vitro digestibility increased from 39.30 % for the control sample to 78.67 % for the water treated samples of taro. After three hours of soaking, the taro flour treated by the solution of corn becomes significantly more digestible (77.12 %) than by the two other treatments [tamarind (60.86 %), water (60.45 %)] that are statistically similar. (...)
45

Návrh elektročásti zařízení na máčení a sušení jader pro tvorbu odlitků / Proposal of electrical equipment for soaking and drying cores for making castings

Čermák, Jiří January 2017 (has links)
This diploma thesis deals with proposal of electrical equipment for soaking and drying cores for making castings at foundry in a Great Britain. It brings look at system of technical norms ČSN and it compares it with british system of technical norms British standards. The second part of this thesis contains detailed proposal of this equipment, including specification of control system, specification of power supply cables and control cables and particular technological units. The whole project documentation is enclosed as an inseparable attachment of this diploma thesis.

Page generated in 0.0347 seconds