Roll Forming
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Microstructural and Micromechanical Effects of Cold Roll-forming on High Strength Dual Phase Steels
In this work correlation between the 1000 MPa dual phase (DP) steel microstructure and the strain gained after roll-forming process have been studied by both microstructural and micromechanical analysis. The scanning electron microscope (SEM) inspection in the bent area reveals changes in the ferrite-martensitic microstructure. The plastic deformation of DP
Mat. Res.. Publicado em: 2015-08
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2. A METHODOLOGY FOR AUTOMATION OF THE FORMING PROCESS USING ROLL BENDERS / UMA METODOLOGIA PARA AUTOMAÇÃO DO PROCESSO DE CONFORMAÇÃO POR CALANDRAS
O presente trabalho apresenta o desenvolvimento de uma metodologia para transformar calandras de tubos e chapas convencionais em equipamentos com sistema automático programável para execução de peças com raios fixos e/ou variáveis. É apresentado um projeto mecânico conceitual (sem detalhamento) e são implementados recursos computacionais para reconh
Publicado em: 2008
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3. Processamento viscoplástico e conformação cerâmica por rolos a frio a partir de suspensões concentradas de alumina. / Viscoplastic processing, and roll pressing, of ceramic bodies by concentrated alumina suspensions.
Plastic forming, followed by roll-pressing, allows to shape ceramic bodies with thickness that are useful for electronic and pavement ceramics. This work introduces an alternative route to processing ceramic plastic mixes. The first step comprehended the selection of suitable raw materials with the aim of assure the best packing of particles, followed by dec
Publicado em: 2005
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4. Numerical simulation of sheet roll forming process to minimize the corrugation / Simulação numerica do processo de perfilação de chapas para minimizar o enrugamento
O processo de perfilação a frio é usado na indústria de fabricação de metal por aproximadamente 100 anos e seu desenvolvimento se deu com a experiência adquirida pelos operadores das perfiladeiras através do método de tentativa e erro, mas com a evolução das máquinas e da informática, surgiu a tecnologia das simulações computacionais que tem s
Publicado em: 2005
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5. Isolation of Ureolytic Peptostreptococcus productus from Feces Using Defined Medium; Failure of Common Urease Tests
Colony counts of fecal samples from three persons, obtained by using a chemically defined anaerobic roll-tube medium (containing glucose, maltose, glycerol, minerals, hemin, B-vitamins, methionine, volatile fatty acids, sulfide, bicarbonate, agar, carbon dioxide (gas phase), and 1 mM NH4+ as main nitrogen source), averaged 60% of the 8.8 × 1010 bacteria per
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6. Isolation and Characterization of an Anaerobic, Cellulolytic Bacterium, Clostridium cellulovorans sp. nov
A new anaerobic, mesophilic, spore-forming cellulolytic bacterium is described. Cellulose is cleared within 24 to 48 h around colonies formed in cellulose agar roll tubes. Cells stain gram negative and are nonmotile rods which form oblong spores either centrally or subterminally in a clostridial swelling. Colonies are irregular with an opaque edge and a cent
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7. Urease assay and urease-producing species of anaerobes in the bovine rumen and human feces.
A growth medium and test were developed for rapid detection of urease in fermentative anaerobic bacteria. Using nonselective rumen fluid roll-tube agar medium and the new test, it was confirmed that Peptostreptococcus productus is often the most numerous urease-forming species in human feces. Also, some fecal strains of Ruminococcus albus, Clostridium innocu
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8. Examination of Bacterial Characteristics of Anaerobic Membrane Bioreactors in Three Pilot-Scale Plants for Treating Low-Strength Wastewater by Application of the Colony-Forming-Curve Analysis Method
Characteristic sludge ecosystems arising in anaerobic membrane bioreactors of three pilot-scale plants treating low-strength (less than 1 g of biological oxygen demand per liter) sewage or soybean-processing wastewater were examined by analysis of the colony-forming-curves (CFC) obtained by counting colonies at suitable intervals. The wastewaters, containing
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9. RNA hairpin-folding kinetics
Based on the complete ensemble of hairpin conformations, a statistical mechanical model that combines the eigenvalue solutions of the rate matrix and the free-energy landscapes has been able to predict the temperature-dependent folding rate, kinetic intermediates, and folding pathways for hairpin-forming RNA sequences. At temperatures higher than a “glass
The National Academy of Sciences.