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Popular Abstract in Swedish Jag har i den här avhandlingen behandlat problemställningar inom tre olika områden inom astronomin. Det som sammanlänkar dessa är att alla innefattar dubbelstjärnor där avståndet mellan stjärnorna är litet, dvs de har en kort period. De är också alla datorsimuleringar. Jag har satt upp en modell för att betrakta de astronomiska systemen och genom numeriska metoder beräkThis thesis introduces and summarizes four papers dealing with computer simulations of astrophysical processes involving binaries. The first part gives the rational and theoretical background to these papers. In paper I and II a statistical approach to studying eclipsing binaries is described. By using population synthesis models for binaries the probabilities for eclipses are calculated for diff

Public transport is essential for closing the gap between different geographical locations. The equal distribution of opportunities to travel is fundamental in both Edward Soja’s theory of spatial justice and Karel Martens’ theory of transport justice. Access to modes of transport may vary according to the socioeconomic status of the area, creating differences in transport opportunities based on l

The current crime debate in Sweden surrounds the overarching issue of criminal networks and children’s exploitation by them. In Sweden, younger children are getting involved in serious criminality, carrying out offences for criminal gangs such as murder and aggravated weapons crimes, which has sparked the government’s interest in possible changes to the youth criminal justice system. One of those

As the identification process is based on the unique patterns of the users, biometrics technologies are expected to provide highly secure authentication systems. The existing systems using fingerprints or retina patterns are, however, very vulnerable. One’s fingerprints are accessible as soon as the person touches a surface, while a high resolution camera easily captures the retina pattern. Thus,

Popular Abstract in Swedish Insulinberoende diabetes mellitus (IDDM = Typ 1 diabetes), och kronisk sköldkörtelinflammation - autoimmun thyreoidit (AIT) anses idag vara orsakade av att de hormonproducerande cellerna angrips av kroppens eget immunsystem (sk. autoimmunitet). När sjukdomen ger sig till känna kliniskt finnes antikroppar (sk. autoantikroppar) riktade mot cellkomponenter i det hormonprodThe two most common autoimmune endocrine diseases in children are autoimmune thyroiditis (AIT) and Type 1 (insulin-dependent) diabetes mellitus (IDDM). Autoantibodies (ab) can be found several years before clinical diagnosis in both diseases. The aims of this study were to investigate the prevalence of thyroid ab in children with IDDM and in children with allergic diseases; to study islet ab and t

This paper describes a low distortion wide band CMOS direct digital RF amplitude modulator, which uses a 10-bit linear interpolation current steering digital to analog converter (DAC) and a Gilbert cell based mixer to generate an amplitude modulated RF signal directly. The linear interpolation increases the attenuation of the DAC's image components. The low pass filter (LPF) is therefore eliminate

Popular Abstract in Swedish (Summary in Swedish) Urininkontinens är ett stort folkhälsoproblem. Ungefär 10 % av kvinnor i 40-årsåldern är drabbade och andelen inkontinenta ökar med ökande ålder. Den vanligaste formen av urininkontinens är så kallad ansträngningsinkontinens med de typiska symptomen urinläckage vid hosta, tunga lyft och gymnastik. I uttalade fall kan dock läckage uppstå redan vid daThe etiology of female stress urinary incontinence (SUI) is unclear. By linking three nationwide medical registries we evaluated maternal and obstetric factors associated with later SUI surgery. Surgery for SUI was strongly associated with vaginal delivery, but not with pregnancy as such. Maternal conditions and interventions during delivery modified the association. Proper evaluation of treatment

Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hallby was the first Swedish embankment to get a permanently installed monitoring system intend

Several recent international publications (e.g. Platzack 1996, 2001; Håkansson, Pienemann & Sayehli 2002; Pienemann 1998; Pienemann & Håkansson 1999) have claimed that learners take the same developmental route in the acquisition of syntax of a second or foreign language, irrespective of their first language (L1). Targetlike verb placement in a Germanic V2 language like German, Dutch or Sw

As the identification process is based on the unique patterns of the users, biometrics technologies are expected to provide highly secure authentication systems. The existing systems using fingerprints or retina patterns are, however, very vulnerable. One's fingerprints are accessible as soon as the person touches a surface, while a high resolution camera easily captures the retina pattern. Thus,

The water vapour resistance of clothing ensembles is not as commonly determined as dry thermal insulation. The measurement techniques are more complicated and the measurement values differ among laboratories. Due to complicated moisture transfer process through clothing ensemble, the moisture absorbed and evaporated varies in transient and steady state phases depending on properties, thickness of

Denna studie fokuserar på barnet som brottsoffer och behandlar barnets ställning i brottmålsprocessen. Barn som brottsoffer är att se som s.k. skyddslösa i och med att de utgör en särskilt utsatt grupp, detta med tanke på deras beroendeställning till vuxna. Denna utsatthet gör barnet i behov av ett särskilt skydd i rättssystemet. Det har därför i den straffrättsliga och straffprocessrättsliga lagsThis study concerns the child as a victim of crime and deals with the child's position in criminal proceedings. Children as victims of crime are seen as so-called defenceless since they constitute a particularly vulnerable group, this considering their dependence on adults. This vulnerability makes the child in need of special protection in the justice system. Therefore, in the criminal and cr

It is beneficial for a furniture company like IKEA to objectively and accurately evaluate what makes a mattress comfortable. But what defines comfort? IKEA currently investigates mattress comfort through extensive real-life user testing. Through which, six parameters of comfort have been identified. By measuring these parameters, one can get an idea of how comfortable a particular person will find

Samsjuklighet av missbruk och psykisk ohälsa är ett komplext problem som enligt social forskning ofta är förankrade med varandra. Det är en aktuell problematik som föreligger i flera länder. Syftet med denna studie har varit att undersöka hur de yrkesverksamma inom socialtjänsten och hälso- och sjukvården upplever att samverkan och samsjuklighet tar sig uttryck mellan de båda instanserna. Metoden Comorbidity of addiction and mental illness is a complex problem that according to social research often is linked to each other. This is a current problem that exists in several countries. The purpose of this study has been to investigate how the professionals in the social services and health care experience that collaboration and comorbidity are expressed between the two instances. The chosen m

Supply risk management (SRM) is a well-established aspect in the field of supply chain management (SCM) that has gained even more relevance due to the ongoing covid-19 pandemic. Many articles have been published relating to the topic, such as Norrman and Jansson (2004) and Zsidisin (2003a). To ensure the academic contribution of this thesis, the authors specifically focused on SRM for companies pr

Nature conservation and outdoor recreation are commonly set as dual goals for the protection of nature areas. However often compatible, they do not always go together. A literature review of related conflicts and risks found that high recreational use can lead to long lasting impacts possibly affecting the whole ecosystem. The damage and compaction of soils on trails and other surfaces can lead to

Abstract Zoos have been gaining increased popularity from tourists in recent years, as many people feel distant from wildlife and thus are eager to experience closeness with animals. The aim of this paper is to analyse tourist experiences of modern zoo tourism and the research question asked is “What types of tourist experiences are tourists gaining when visiting a modern zoo?” To achieve this ai

Agile Management is a management method based on the principles behind Agile Software Development. Compared to Traditional Management, Agile Management is more iterative and is therefore suited for fast paced and unsecure environ-­‐ ments. Even though agile is a fairly old methodology; there are few case studies outside the software industry. There are indi-­‐ cations, though, that Agile Managemen

The cognitive abilities explained by cognitive science and cognitive semantics can inform us concerning the use of metaphors in science. The thesis is that abstract ideas rest on experiences of the concrete world. In this paper I will explain the use of conceptual metaphors in science, with examples from the mechanistic worldview of the 17th and 18th century. If we proceed from the way people thin