Causas de anestro em bovinos da microrregião de Juiz de Fora- MG.

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Detection of alfa-amylase inhibitors by a zymography method, performed in isoelectric focusing electrophoretic PhastGels.

Made available in DSpace on 2018-06-07T00:54:19Z (GMT). No. of bitstreams: 1 ID288091.PDF: 374985 bytes, checksum: c7206a960b6fb7dace01b9ed9f0ac58e (MD5) Previous issue date: 2008-01-2

Redesign of machine component in polymeric matrix composite towards increased productivity

This work is focused in the maximization of the acceleration a 2D Industrial Laser Cutting Machine (ILCM). The changes to be implemented are centered in the replacement of a metallic critical component: the gantry. This component largely influences precision and maximum acceleration. Finite Elements Analysis was performed to the current metallic part. From this analysis the maximum allowed deformations were established. A replacement composite component capable of an equally valid behavior was designed in carbon fiber. To establish the maximum increase in acceleration that does not lead to precision losses, the working conditions were simulated and the acceleration to which the component was subjected to was varied. The variation of the thickness of layers with different orientations and locations in the part allowed for the understanding of how the mass varies along with the maximum possible acceleration. This analysis, asides with considering the maximum force allowed by the linear motor that is responsible by the gantry motion, establishes the limit in terms of maximum acceleration of the machine. An increase of 22% in the maximum acceleration while maintaining the precision is possible due to the higher specific rigidity of composite materials and the use of an optimization heuristic

Redesign of an industrial laser cutting machine’s gantry in composite material

This work is focused in the design stage of a composite structure intended to replace a metallic critical component in a 2D Industrial Laser Cutting Machine (ILCM). The component is the gantry, largely responsible for most of the ILCM’s characteristics. These include precision and maximum acceleration, which are critical. The dimensioning of the component is initially performed based on analytical models, but latter stages use the numerical capabilities of Finite Elements Method. In the end it is possible to take advantage of the higher specific rigidity of composite materials to increase the maximum acceleration that the machine allows for while maintaining the precision.(undefined

Dynamic FE model updating using particle swarm optimization method: A methodology to design critical mechanical composite structures

To increase the performance of an industrial cutting machine, this work studied the possibility of replacing its current main steel gantry by a Carbon Fibre Reinforced Polymer (CFRP) composite solution. This component strongly influences the most relevant characteristics of the equipment, namely accuracy and maxima allowed accelerations. The flexibility of composites in terms of number, thickness and orientation of layers and the challenging trade-offs between weight and stiffness motivated the development of an optimisation process. The Particle Swarm Optimisation method (PSO) was used to develop a solution able to ensure higher accelerations and the required accuracy of the equipment, by optimizing continuously the FE model algorithm input and output assessment and updating it. The process resulted in a near optimal solution allowing a 43% weight reduction and an increase of the maximum allowed acceleration in 25%, while ensuring the same accuracy.This work has been supported by FCT – Fundação para a Ciência e Tecnologia within the R&D Units Project Scope: UIDB/00319/2020 and the scholarship SFRH/BD/51106/2010

Anais do Workshop sobre embriões bovinos produzidos in vitro: perspectivas de utilização e possíveis impactos na pecuária brasileira.

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Construção de secador solar para desidratação de produtos agrícolas e florestais.

O uso de secador solar é uma forma sustentável de desidratação de produtos agrícolas e florestais, visto que permite o aproveitamento da radiação solar, ener- gia limpa e renovável, durante o proces- so. Materiais em desuso ou de baixo custo são aproveitados, além disso. O secador possibilita o beneficiamento de matérias-primas que podem ser usadas como fonte de renda e de geração de emprego, principalmente para a agricul- tura familiar. A construção do secador solar de- manda materiais de fácil aquisição, tais como ripas, cano de PVC, compensado de madeira, os quais podem ser subs- tituídos por taquaras/bambu ou outros materiais disponíveis na propriedade. Outro benefício do secador solar é o custo energético nulo, uma vez que são utilizados dois recursos naturais gratuitos e abundantes: a energia solar e o vento, sendo assim uma alternativa limpa e ba- rata para o pequeno produtor rural

Desenvolvimento de embriões produzidos in vitro da Raça Gir e Holandesa criadas em clima tropical.

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Digestive alfa-amylases from Tecia solanivora larvae (Lepidoptera: Gelechiidae): response to pH, temperature and plant amylase inhibitors.

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Sistema de produção de leite a pasto com rebanho mestiço: 25 anos de informações.

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