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Kontinuerliga tvåfraktionsinsamlare för övervakning av partikulära luftföroreningar i arbetsmiljö

Rapporten beskriver prototyper av kontinuerliga tvåfraktionsinsamlare för övervakning av partikulära luftföroreningar i arbetsmiljö som har konstruerats. En prototyp är personburen och ger möjligheter till insamling av två partikelstorleksfraktioner i 18 diskreta intervall. PIXE-metoden (analys med partikelinducerad röntgenstrålning) används för multielementanalys av de erhållna proven. Även med m

Gear Tooth Surface Roughness of Helical Gears Manufactured by a Form Milling Cutter

Manufacturing involute gears using form grinding or form milling wheels are beneficial to hobs in some special cases, such as small scale production and, the obvious, manufacture of internal gears. To manufacture involute gears correctly the form wheel must be purpose designed, and in this paper the geometry of the form wheel is determined through inverse calculation. A mathematical model is prese

Manufacturing in the knowledge economy: innovation in low-tech industries

Recent studies stress the relevance of a broad conceptualization of the knowledge economy which goes beyond the strong, current policy focus on high-tech industries. Today, low-tech industries continue to have a significant role in European manufacturing in terms of employment, value added and export. However, the character and activities of these industries are profoundly changing as they become

Ecology of Populations

The theme of the book is the distribution and abundance of organisms in space and time. The core of the book lies in how local births and deaths are tied to emigration and immigration processes, and how environmental variability at different scales affects population dynamics with stochastic processes and spatial structure and shows how elementary analytical tools can be used to understand populat