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Asymmetric rolling of interstitial-free steel using differential roll diameters. Part I : Mechanical properties and deformation textures

IF steel sheets were processed by conventional symmetric and asymmetric rolling (ASR) at ambient temperature. The asymmetry was introduced in a geometric way using differential roll diameters with a number of different ratios. The material strength was measured by tensile testing and the microstructure was analyzed by optical and transmission electron microscopy as well as electron backscatter dif

Asymmetric rolling of interstitial-free steel using one idle roll

The effect of additional shear on the asymmetric rolling (ASR) of an interstitial-free (IF) steel was studied by modeling and experiments. The asymmetry was introduced by making one roll idle. A 66 pct of total thickness reduction was performed in 6 passes with less than 16 pct reduction per pass. ASR was performed in two ways: monotonically and by rotating the sheet between passes by 180 deg arou

Monitoring changes in membrane polarity, membrane integrity, and intracellular ion concentrations in Streptococcus pneumoniae using fluorescent dyes

Membrane depolarization and ion fluxes are events that have been studied extensively in biological systems due to their ability to profoundly impact cellular functions, including energetics and signal transductions. While both fluorescent and electrophysiological methods, including electrode usage and patch-clamping, have been well developed for measuring these events in eukaryotic cells, methodol

Nutrition and Physical Activity among Somali Immigrants in Sweden

Overall aim of the thesis The overall aim of the research was to explore dietary habits, physical activity and weight status of Somali immigrants in southern Sweden. Method Both quantitative and qualitative methods were used. Study I was a questionnaire-based, cross - sectional study containing questions about socio demographic data, physical activity (PA) and dietary habits. In study II a qualit

Mechanisms of acidosis-mediated ischemic brain damage: Histopathology and pathophysiology

Exaggerated acidosis due to preischemic hyperglycemia shortens the maturation time for cell death and turns selective neuronal damage into pannecrosis. Some issues concerning the mechanisms are yet to be clarified. The present study was designed to define critical thresholds of plasma glucose, to investigate the influence of preischemic hyperglycemia on ion transients, to evaluate the role of calc