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Improving Ethanol Production from Lignocellulose Hydrolyzates: Fed-batch Fermentation, Yeast Cultivation and Strain Development for Increased Tolerance

Ethanol production by the yeast Saccharomyces cerevisiae from dilute acid lignocellulose hydrolyzate was studied with the aim to improve fuel ethanol production. Specifically, the problem of inhibition was addressed. Lignocellulose hydrolyzate contains not only sugars, but also several compounds, such as furfural and 5-hydroxymethyl furfural (HMF), which can inhibit yeast growth and ethanol produc

Tool Life and Wear Model in Metal Cutting, Part 1 - Influence of Varying Flank Wear Criterion on Colding's Tool Life Equation

The tool life model formulated by Bertil Colding is limited to the use of a specified tool life criterion. The Colding equation describes the relationship between tool life, cutting speed and the equivalent chip thickness. The Colding equation is based on five constants which have unique values for each selected value of the tool life criterion. This paper investigates how these Colding constants

Eldens återsken : Första världskriget i svensk föreställningsvärld

Reflections of Fire. Images of the First World War in Sweden This thesis investigates the cultural impact of the First World War in Sweden, and how it shaped Swedish images and narratives about war and neutrality from 1914 to 1935. In line with Paul Fussell, George L. Mosse, and Jay Winter, among others, I discuss the symbolic, discursive aspects of the war at a popular, everyday level. The theor

Always on the wing - Fluid dynamics, flight performance and flight behavior of common swifts

The aerodynamics and kinematics behind the flight of animals are relatively unknown. Although animal flight has been studied for several hundreds of years, it is only in recent time that we have the technical abilities to study the mechanistic basis of animal flight. This thesis represents an attempt to widen the knowledge about animal flight by studying one of the most advanced flyers of the natu

Process control of an Open Plate Reactor

A new chemical reactor, the Open Plate Reactor, is being developed by Alfa Laval AB. It combines good mixing with high heat transfer capacity. With the new concept, highly exothermic reactions can be produced using more concentrated reactants. In the paper, the reactor type is presented and a process control system is developed.A utility system to provide the reactor with cooling water is designed

MeV Protons for the Characterization of Aerosols in Work Environments

In this paper the advantages of accelerator-based chemical analysis of work environment aerosols are discussed. Use of the PIXE method is central, but in order to take full advantage of the possibilities of an accelerator laboratory, it should be combined with nuclear methods such as particle-induced nuclear reactions and/or particle scattering for simultaneous measurements of light elements. It i

Att återskapa det förflutna - mellan kunskap och upplevelse

This text shows how the use of archaeological evicence in reconstructing the past give different views of each period in the past, from the Stone Age to the Middle Ages. Reconstructing the past is an adventure based on both knowledge and experience.

Minimum-energy sub-threshold self-timed circuits: design methodology and a case study

This paper addresses the design of self-timed energy minimum circuits, operating in the sub-VT domain. The paper presents a generic implementation template using bundled-data circuitry and current sensing completion detection. To support this, a fully-decoupled latch controller has been developed, which integrates the current sensing circuitry. The paper outlines a corresponding design flow, which

Cognitive development in context: Learning to pay attention

A developing system must be able to learn new things without forgetting what it has learned before. It should be capable of reacting in different ways to the same stimuli in different contexts. Context sensitive reinforcement learning, which parallels some of the functions of the basal ganglia, is a learning algorithm that fulfills this requirement when the context is explicitly given. Here, we ex