We study and solve the previously unstudied problem of finding both sender and receiver positions from time of arrival (TOA) measurements when there is a difference in dimensionality between the affine subspaces spanned by receivers and senders. Anchor-free TOA network calibration has uses both in sound, radio and radio strength applications. Using linear techniques and requiring only a minimal nu

Aims This study aimed to determine the risk of developing diabetes among relatives of patients diagnosed between 15 and 34 years of age who were treated with insulin. Our second aim was to determine whether there was a difference in risk of diabetes between relatives of male and female patients. Methods A questionnaire was sent to patients in the Diabetes Incidence Study in Sweden registry diagno

The airflow field and spray characteristics from an air blast type of injector in an industrial gas turbine (GT) combustor geometry have been investigated experimentally and numerically. The flame in the current combustor is stabilized by a highly swirling flow. The stabilization of the flame is strongly dependent on the stability of the flow field out from the injector and into the combustor. Liq

This thesis concerns the analysis of anthropogenic substances of the compound class known as persistent organic pollutants (POPs). Sample preparation perspectives for the analysis of POPs in the environmental matrices water, soils and sediments are presented. This thesis features reasonably cheap and uncomplicated methodology capable of fast screening of POPs. It displays how quantitative extract

Popular AbstractSyftet med avhandlingen är att undersöka på vilket sätt teater med ungdomar, enligt ungdomarnas egna erfarenheter och utsagor om det, utgör en kollektiv bildningsprocess. I avhandlingens syfte ingår att analysera hur en teaterföreställning växer fram och att skapa förståelse för vad som sker mellan olika aktörer, främst mellan ungdomar och ledare.Forskningsfenomenet, unga människorThe objective of this research project is to investigate in what way young people's theatre playing, according to their own experiences, constitute a collective educational process. Also, the project aims at understanding the interaction between the different actors, and particularly between the young amateurs and their leaders. Young people's acting in this research project is understood from a p

Energy simulation programs are commonly used to calculate the climate and energy requirements in glazed spaces and adjacent buildings. However, these programs have usually been developed to study buildings with ordinary window sizes. Comparisons of four simulation programs were carried out for a sunspace with an adjacent room. The distribution of solar radiation between the glazed space and the ad

Det resfria mötet – vårt sätt att arbeta och träffas utan att vara på samma plats fysiskt – blir allt vanligare. Men vad blir effekterna och hur mäter vi dessa? Med hjälp av verktyg som telefonkonferenser, videokonferenser och datorstödda mötesverktyg sköter vi en allt större del av vår dagliga verksamhet. Organisationer inför och använder resfria mötesverktyg med en förhoppning att de ska medföra

MIMO is a wireless communication technology that is growing in popularity due to its ability to deliver significant improvements over conventional systems. However, some applications require antennas to be closely spaced, which results in strong coupling among the antennas and performance degradation. Here we show that in a random field, load impedance can play an important role in the power, corr

Bird brooches at Uppåkra have a changing biography, as grave gifts, pendants, and scrap metal. The association between bird brooches and birds of prey, and a male face to female jewellery opens questions of identy of the wearer and the male person in question. Following the bird brooches and the connotations of falconry decode both a social identiy and a lifestyle, expressed in the aestetics of th

The complex interplay by tunneling and scattering in quantum cascade lasers is analyzed with nonequilibrium Green's functions. Data for a recently proposed simple structure based on only two wells per period is presented. This simple structure allows to visualize the relevance of the tunneling resonance very clearly. It is argued that a QCL design needs at least three levels per period, thus furth