Filtyp
A study on guided waves in a. layered half-space with large velocity contrasts and a decreasing velocity with depth is presented. Multiple mode dispersion curves are calculated in the complex wave number domain, taking into consideration the attenuation caused by leakage into the underlying half-space. The excitability of the modes by a vertical point force on the surface is also calculated. Resul
The aim of this thesis was to study onlay bone grafting in the adult rat to improve graft incorporation and perservation of graft size. In 167 adult isogeneic lewis rats, the size maintenance and bone formation at the graft-host interface of uni- and bicortical onlays positioned in various environments and treatments were investigated. The findings were assessed after four, 12 and 20 weeks with ro
In recent years global problems such as climatic change, acid rain, and water pollution in surface and subsurface environments dominate discussions of world environmental problems. In this paper, the roles of hydrologic processes and hydrogeochemical processes are investigated through development, modification, and application of mathematical models for addressing point and non-point source water
Popular Abstract in Swedish Utvecklingen av laserpulser med extremt hög intensitet har försett forskare med ett verktyg som gör det möjligt att studera vad som händer då dessa pulser växelverkar med olika slags materia. Då växelverkan sker med en gas kan till exempel ultrakorta pulser från ultraviolett till röntgenområdet genereras som övertoner till laserpulsen. Dessa övertoner kan göras kortare The availability of short-pulse, high-intensity lasers has opened doors to new areas in atomic and plasma physics. The short pulses (a few femtoseconds), that are available today, enable unprecedented temporal measurements, while the high peak power accessible (several terawatts) allows physicists to study the interaction between light and relativistic plasmas. The aim of this work was twofold: i)
This study concerns fundamental analysis and predictive modelling of heat and mass transfer in frozen hamburger patties cooked in a double-sided contact fryer. Mathematical and physical models are formulated and further developed to enable improved understanding of the transport processes and reveal the influence of essential parameters. Prediction and analysis of practical situations with heating
Popular Abstract in Swedish Bioteknik är ett mycket brett ämne som handlar om att använda biologiska reaktioner för att tillverka önskvärda produkter. Det innefattar arbete med mikroorganismer, svampar, enzymer och att få dem att göra som man vill. Enzymer är naturens egna katalysatorer som gör att reaktioner går snabbare utan att själva förbrukas och de är till exempel en viktig del i vår matsmälInterest in sustainable development has increased throughout society during the past decades, and the chemical industry is no exception. The appeal for renewable raw materials has consequently increased and has paved the way for the implementation of industrial biotechnology. Since enzymes are used to convert biomass in nature, they may also be a good choice in the chemical industry. However, to i
Popular Abstract in Swedish Ett flertal produkter som framställs inom den kemiska och biotekniska industrin produceras i stora turbinomrörda tankar. Kvaliteten av produkten och utbytet av processen påverkas av blandningsförhållandena i dessa tankar. Blandningsförhållandena i processen påverkas av vätskans hastighet och dess intensitet. I olika regioner av reaktorn, impeller regionen och bulk regiTurbine-agitated tanks are used in chemical and biochemical applications to increase mixing which, in turn, affects the yield, productivity and product quality. The purpose of this work was to study the hydrodynamic influence on the scale-up of turbine-agitated tanks, commonly used in fermentation. Local turbulent flow parameters, the turbulent kinetic energy and the local energy dissipation rate,
Objective This study provides the summary of current knowledge about migrant work in agriculture available from journal articles, books, reports and other relevant academic publications, focusing on political, economic, legal, social and medical aspects of migrant work in agriculture. Methods A systematic search was carried out on the LibHub and Google Scholar databases in order to compile the e
This paper offers a two-zone NOx model suitable for vehicle on-board, on-line implementation. Similar NOx modeling attempts have previously been undertaken. The hereby suggested method does however offer clear and important benefits over the previously methods, utilizing a significantly different method to handle temperature calculations within the (two) different zones avoiding iterative computat
In this Licentiate Dissertation presents a new model for selecting environmental performance indicators in order to improve environmental management. The suggested Total Cost Indicators support a support a preventive approach to environmental management, where environmental issues are addressed before they arise - and before they become costs. The method of selecting indicators builds on earlier
Popular Abstract in Swedish Stärkelsemikrosfärer undersökta i denna avhandling är avsedda för kontrollerad tillförsel av läkemedel som utförs i form av depåpreparat eller slow release-former. Stärkelsemikrosfär är en beredningsform anpassad för inkapsling av protein i terapeutiskt syfte. För att uppnå en kontrollerad frisättning kan stärkelsemikrosfärer täckas av poly (DL-lactide-co-glycolide) (PStarch microsphere is a dosage form suitable for the encapsulation of protein drugs. The starch microspheres investigated in this thesis are intended for release of the drug in a pre-designed way, or in controlled manner. For this purpose the starch microspheres can be coated by poly(DL-lactide-co-glycolide) (PLG) film, which is a release controlling. The term microsphere quality is complicated an
Popular Abstract in Swedish Avhandlingens forskningsfrågor är: ”Vad är det som har möjliggjort att det talas om sjuka som kunder, hur har en sådan förskjutning av föreställningen om den sjuke skett och vad medför en sådan förskjutning?” Marknadstänkandet har successivt introducerats inom sjukvården under de sista decennierna av 1900-talet. Marknadstänkandet försöker ersätta tidigare förvaltnings-Marketization of society has gradually transformed health care at the end of the 20th century. The conditions of possibility for this transformation have been the social impact of the market discourse and the discourse on patient rights. These discourses brought about a displacement of the discursive order in health care. One effect of this discursive break was that the view of the sick person was
Popular Abstract in Swedish Många av dagens biotekniska processer syftar till att framställa protein. Det är proteinets användningsområde som är avgörande för vilka renhetskrav som ställs på produkten. I vissa fall måste proteinet vara helt fritt från föroreningar för att inte åstadkomma oönskade effekter. Vaccinframställning är ett exempel på en sådan tillämpning. För andra ändamål, t ex vid framTwo polymers, alginate and Eudragit S-100 were used as reversibly soluble-insoluble ligand carriers for the selective isolation of enzymes and lectins respectively. These two polymers have the inherent property of being precipitated under well defined conditions. Alginate was made insoluble by the addition of Ca2+ ions, and Eudragit S-100 by a pH shift. The polymers were modified with affinity lig
This thesis introduces and summarizes four papers dealing with the study of double and multiple stars using space astrometry. The introduction gives a brief review of the role of binary observations in various fields of astronomy --- star formation, stellar masses and the mass-luminosity relation, initial mass function, detection of sub-stellar mass companions. The astrometric techniques are also
Popular Abstract in Swedish I alla flercelliga organismer behövs utbyte av information mellan cellerna, som bygger upp kroppen. För detta ändamål är cellerna försedda med små antenner, som kan ta emot signaler och kallas därför receptorer. Receptorer kan vara uppbyggda på olika sätt. De flesta receptorer slingrar sig sju gånger genom membranet och har ett gemensamt sätt att fortleda signaler till Seven-transmembrane, G-protein coupled receptors play a central role in physiology since they facilitate cell communication in multicellular organisms by recognition of a broad range of ligands. They also represent important drug targets. Unfortunately, for many of these receptors the endogenous ligands, and, hence, their physiological functions, remain to be identified. These receptors are usuall
Popular Abstract in Swedish Fågelflyttning omfattar några av de mest fascinerande beteendemässiga anpassningarna vi finner i naturen. Hos många fågelarter flyttar unga fåglar obereoende av erfarna vuxna individer och kräver således medfödd information om flyttningsvägar, rastning och övervintringsområden. Denna information har visat sig bestå av ett nedärvt program som innehåller flyttningsriktninIn many species of birds juveniles migrate independently of experienced adults and thus have to rely on innate information about migratory routes and wintering area. This information is encoded as a set of inherited migratory directions and a timing schedule that provides information on when and how far to migrate. Apart from these remarkable behavioral adaptations, migration also requires several
The Swedish consumer magazine Råd & Rön (”Advice and Results”) has been available to Swedish consumers since 1958. For a major part of this time the Swedish state, represented by Konsumentverket (the Swedish Consumer Agency) and its predecessor, Konsumentinstitutet (the National Institute for Consumer Information), was the owner of the magazine. In 2006 Råd & Rön was sold to the independen
Today one could argue that most of the logistics research available has a strong connection to the positivistic paradigm where there is a great emphasis on simplicity in both the research conducted and in the solutions produced. The overall ability to design, plan and control is promoted by the researchers to a great extent. Consequently, firms invest money, time and resources in solutions, based
Popular Abstract in Swedish 10.SWEDISH SUMMARY(Populärvetenskaplig sammanfattning) Proteiner är viktiga byggstenar i cellen och är uppbyggda av kroppens tjugo olika aminosyror. Varje protein har en unik egenskap och spelar en viktig roll för cellens funktion. Vissa proteiner löser sig i vatten (hydrofila) medan andra är olösliga (hydrofoba). Membranproteiner är hydrofoba proteiner som är inbäddadeMembrane proteins are crucial components of the cell and are involved in many biological processes. Recombinant overexpression systems together with different purification methods are necessary to obtain large amounts of purified receptor for biophysical and functional studies. More knowledge about membrane proteins, and especially G-protein coupled receptors, would facilitate the development of i
In order to improve the forecasts of the impact of solar activity on the terrestrial environment on time scales longer than days, improved understanding and forecasts of the solar activity are needed. The first results of a new approach of modelling and forecasting solar activity are presented. Time series of solar activity indicators, such as sunspot number, group sunspot number, F10.7, E10.7, so
