Search results

Filter

Filetype

Your search for "*" yielded 530287 hits

Coherent electron flow from a double slit with slit widths in the quantum conductance regime

We report on a theoretical study of the quantum interference behaviour of electron flow from a double-slit device made from a semiconductor two-dimensional electron gas (2DEG) system with the slit widths in the quantum conductance regime. The device consists of a double slit and a single slit in a configuration where the single slit is placed on the source side of the double slit. The wavefunction

Ectomycorrhizal activity as affected by soil liming

Popular Abstract in Swedish Under de senaste decennierna har det blivit allt mer uppenbart att det på grund av luftföroreningar skett en försurning av skogsjordarna i södra Sverige. Kalkning har föreslagits som en åtgärd för att motverka ytterligare försurning och bibehålla produktiviteten hos skogarna i de värst drabbade områdena. Inför ett sådant stort ingrepp i naturen är det viktigt att studerIn this thesis effects of liming on ectomycorrhiza have been studied in relation to effects on root colonization, fungal growth and nutrient uptake. In field experiments the effects of liming on ectomycorrhizal colonization of root tips were variable, possibly due to different soil types and climatic variations. However, a changed mycorrhizal community structure could be detected. Laboratory studi

Service-oriented Process Control with Grafchart and the Devices Profile for Web Services

To fulfill increasing requirements within the manufacturing sector, highly flexible and adaptable automation systems are needed. It is desirable to have one integrated approach that stretches from the process planning phase, through the implementation phase and all the way to the phase for execution of the process control logics. One promising approach is to use the concepts of service-oriented ar

Power System Oscillations - Detection, Estimation and Control

The topic of this thesis is the electro-mechanical oscillations which to some extent always are present in a power system. The demand of electric power is ever increasing. At the same time, the tolerance of disruptions in the power supply is decreasing. The deregulated market together with distributed generation have then pushed the system to operate during circumstances for which it was not desig

B cell activation in vitro: thymus-dependent immune responses and bacterial cell surface proteins

In this thesis aspects of peripheral B lymphocyte differentiation were studied. Through in vitro experiments, B lymphocyte activation was assessed. B lymphocytes express immunoglobulin (Ig) specific for a certain antigen on the cell surface, and when surface Ig is crosslinked by an antigen, the cell is activated. Antigens giving rise to a T cell dependent immune response are internalized by the B

Frihet från underordning. En kritisk rättsvetenskaplig studie av diskriminering av deltidsarbetande och visstidsanställda (Freedom from subordination. A critical legal study of discrimination of part-time and fixed-term workers)

This dissertation deals with discrimination of part-time and fixed-term workers. The EU directives on part-time and fixed-term work, as well as Swedish law in the same area, are the starting point of the analysis. The aim is to offer a reading of discrimination law as an instrument for freedom from subordination. Inspiration is found in critical legal positivism’s idea of the autonomous individual

Essays on Corporate Governance

This thesis consists of four self-contained, yet related articles which all contribute mainly to the corporate governance literature. Very broadly, the first two papers are on family firms and large shareholders in Sweden while the second two are on Enterprise Risk Management (ERM) practices in Nordic countries. The contribution of Paper 1 is that I for the first time take into account the two dim

Femteklassprojektet - rekrytering och samtidig kompetensutveckling

För drygt tio år sedan startades det s.k. mellanstadieprojektet – numera ”femteklassprojektet". Det hela går ut på att teknologer besöker mellanstadieklasser, i första hand femteklasser. Besöket inleds med ett antal spännande demonstrationsförsök ("teknik-, kemi- och fysikshow"). Teknologerna berättar om sig själva, om vad man gör på den tekniska högskolan och vad LTH är för någonting. Ett viktigt

Characterization of the Intestinal Microbiota by DNA-Based Methods

The intestinal flora and the bacteria found in the extraintestinal sites were studied in liver injury rats, with or without Lactobacillus plantarum 299v pre-treatment. The dominating intestinal flora and translocating bacteria were typed by RAPD and identified by 16S rDNA sequencing. It was proved that bacterial strains from the intestine could pass through the intestinal barrier to the extraintes