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Controlled resistive loads can contribute to damping of electro-mechanical oscillations. This paper presents an on-off damping controller for a single machine system. It was used at a field test in southern Sweden to damp oscillations of a 0.9 MW hydro power generator. The controller used estimated machine frequency as input and controlled a 20 kW resistive load via thyristor switches. The field m
Krönika om den informella ekonomin, skattemyndigheten och statens övervakning av granntjänster.
PURPOSE: To identify factors associated with arthroscopically diagnosed scaphoid fracture displacement and instability. METHODS: This was a secondary use of data from 2 prospective cohort studies. The studies included 58 consecutive adult patients with a scaphoid fracture who elected arthroscopy-assisted operative fracture treatment: some for displacement, some as part of a prospective protoco
Aim: Several studies have addressed the association between changes in the female sex hormones estrogen and progesterone levels and changes in parameters of periodontitis. In order to understand how these hormones affect periodontal health it is of major importance to obtain information on their physiological importance. We have previously shown that periodontal ligament cells (PDL cells) express
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We encounter multimodality every day: in the newspapers, journals, ads, posters, story books, text books, leaflets, encyclopedias, instruction books, computer interfaces and in our interactions. Multimodality has been studied within many different disciplines: semiotics/sociosemiotics, textlinguistics, interface design, and human-computer-interaction. Yet, the approaches in the research of multimo
Discussion of Danish TV-series "1864".
The purpose of this study was to investigate lifetime prevalence and characteristics of self-reported child sexual abuse and associations between child sexual abuse, gender, sociodemographic data, and consensual sexual experiences. A questionnaire was completed by 4,339 Swedish high school seniors. Three categories of child sexual abuse were studied: noncontact, contact without penetration, and pe
Erik Cinthio - an bibliography 1946-1985: Bibliography for professor in medieval archaeology Erik Cinthio; including contributions in newspapers and encyclopedias.
AIMS: The present study aims to quantify non-participation in the RIKS-HIA register during 2005 and to compare acute myocardial infarction (AMI) patients registered and not registered in RIKS-HIA, in relation to sociodemographic factors, prevalent disease, and 7-day and 30-day survival. METHODS: We linked information on sociodemographic characteristics, treatments, morbidity, and mortality from th
