| 1. |
- Elg, Alf Peter, et al.
(författare)
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Research project EMPIR 19ENG02 future energy
- 2020
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Ingår i: VDE High Voltage Technology 2020. - : VDE Verlag GmbH. - 9783800753550 ; , s. 252-257
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Konferensbidrag (refereegranskat)abstract
- Society's increasing demand for electrical energy, along with the increased integration of remote renewable generation has driven transmission levels to ever higher voltages in order to maintain (or improve) grid efficiency. Consequently, high voltage testing and monitoring beyond voltage levels covered by presently available metrology infrastructures are needed to secure availability and quality of supply. Calibration services for Ultra-High Voltage Direct Current (UHVDC) presently are only available up to 1000 kV. There is a need to extend the DC calibration capabilities for voltage instrument transformers up to 1200 kV and for factory component testing capabilities up to 2000 kV. Also, methods for linear extension of lightning impulse calibration, for dielectric testing of UHV grid equipment, urgently need revision. Recent research has raised questions regarding the validity of the current linearity extension methods for voltages beyond 2500 kV. Furthermore, new methods for calibration are needed for the 0.2 class HVAC voltage instrument transformers for system voltages up to 1200 kV. The current methods used for determination of the voltage dependence are very time consuming, raising the need for methods allowing faster assessment. Finally, with new HVDC transmission grids and associated components, novel methods are needed for detection, classification and localisation of partial discharge (PD) under DC stress. The industry needs methods for reliable monitoring of critical components such as cables, for both HVAC and HVDC, and gas insulated substations (GIS), and techniques for addressing new challenges introduced by HVDC technologies, such as the ability to distinguish PD signals from switching transients in converters and other sources of noise.
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| 2. |
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| 3. |
- Hägglin, Catharina, 1955, et al.
(författare)
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Dental anxiety in relation to mental health and personality factors. A longitudinal study of middle-aged and elderly women.
- 2001
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Ingår i: European journal of oral sciences. - : Wiley. - 0909-8836 .- 1600-0722. ; 109:1, s. 27-33
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Tidskriftsartikel (refereegranskat)abstract
- Little is known about the longitudinal course of dental anxiety in relation to age, mental health and personality factors. In 1968 69 a representative sample of 778 women aged 38 to 54 yr took part in a psychiatric examination. Three hundred and ten were followed up in 1992-93. A phobia questionnaire, including assessment of dental fear, and the Eysenck Personality Inventory were distributed to the participants at both occasions. High dental fear was reported by 16.8% of the women at baseline and was associated with a higher number of other phobias, a higher level of neuroticism, more psychiatric impairment, more social disability due to phobic disorder, and a higher anxiety level. Among women who reported high dental fear in 1968 69 (n=36), 64% remitted and 36% remained fearful. Among women with low dental fear in 1968 69 (n = 274), 5% reported high dental fear in 1992-93. Chronicity was associated with higher neuroticism, lower extraversion, and more psychiatric impairment at base-line. Remission was associated with higher extraversion at baseline. Dental anxiety increased or decreased over time in concert with the number of other fears.
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| 4. |
- Hällström, J, et al.
(författare)
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International comparison of software for calculation of lightning impulse parameters based on a new processing algorithm
- 2007
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Konferensbidrag (refereegranskat)abstract
- A new algorithm has been proposed to calculate the parameters of full lightning voltage impulses. The new algorithm enables the application of the test voltage factor (also referred to as k-factor in some literatures) for calculation of the equivalent test voltage of impulses with superimposed oscillations/overshoots. The new algorithm at the same time provides a robust procedure for obtaining time parameters of the impulses from not only smooth waveforms but also waveforms with varying degrees of distortions in the front part of the impulses. These distortions include oscillations on the impulse front and overshoots in the peak region. A critical part of the new algorithm is a 4-parameter fitting procedure to obtain the base curve, which is used for calculation of the test voltage curve. Another important part of the algorithm is applying a filtering procedure in the calculation of the test voltage curve. The new algorithm was tested in different laboratories using different programming languages and different techniques for realising the fitting and filtering routines. The paper reports the results obtained from the participating laboratories using the proposed algorithm. The results obtained by the participating laboratories using existing software based on the requirement of IEC 60060-1: 1989 were also compared. It is anticipated that the results can serve as a part of the basis for a new procedure for determination of lightning impulse parameters in the revised IEC 60060-1.
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| 5. |
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| 6. |
- Högberg, G, et al.
(författare)
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Active multimodal psychotherapy in children and adolescents with suicidality: description, evaluation and clinical profile
- 2008
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Ingår i: Clinical child psychology and psychiatry. - : SAGE Publications. - 1359-1045 .- 1461-7021. ; 13:3, s. 435-48
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to describe and evaluate the clinical pattern of 14 youths with presenting suicidality, to describe an integrative treatment approach, and to estimate therapy effectiveness. Fourteen patients aged 10 to 18 years from a child and adolescent outpatient clinic in Stockholm were followed in a case series. The patients were treated with active multimodal psychotherapy. This consisted of mood charting by mood-maps, psycho-education, wellbeing practice and trauma resolution. Active techniques were psychodrama and body—mind focused techniques including eye movement desensitization and reprocessing. The patients were assessed before treatment, immediately after treatment and at 22 months post treatment with the Global Assessment of Functioning Scale. The clinical pattern of the group was observed. After treatment there was a significant change towards normality in the Global Assessment of Functioning scale both immediately post-treatment and at 22 months. A clinical pattern, post trauma suicidal reaction, was observed with a combination of suicidality, insomnia, bodily symptoms and disturbed mood regulation. We conclude that in the post trauma reaction suicidality might be a presenting symptom in young people. Despite the shortcomings of a case series the results of this study suggest that a mood-map-based multimodal treatment approach with active techniques might be of value in the treatment of children and youth with suicidality.
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| 7. |
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| 8. |
- Högberg, G, et al.
(författare)
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Treatment of post-traumatic stress disorder with eye movement desensitization and reprocessing: Outcome is stable in 35-month follow-up
- 2008
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Ingår i: Psychiatry Research. - : Elsevier BV. - 0165-1781 .- 1872-7123. ; 159:1-2, s. 101-108
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Tidskriftsartikel (refereegranskat)abstract
- Post-traumatic stress disorder (PTSD) is an anxiety disorder that may follow major psychological trauma. The disorder is longstanding, even chronic, and there is a need for effective treatment. The most effective short-term treatments are cognitive behavioural therapy and eye movement desensitization and reprocessing (EMDR). Twenty subjects with chronic PTSD following occupational health hazards from "person under train" accidents or assault at work were treated with five sessions of EMDR. They were assessed with psychometric scales and diagnostic interviews before treatment, directly after treatment, at 8 months, and at 35 months after the end of Therapy. The primary outcome variable was full diagnosis of PTSD according to the DSM-IV diagnostic criteria. Results from interview-based and self-evaluation psychometric scales were used as secondary outcome variables. Immediately following treatment, the patients were divided up into two groups, initial remitters (12 of 20) and non-remitters (8 of 20). There were no drop-outs during therapy, but three patients withdrew during follow-up. The initial result was maintained at the 35-month follow-up. The secondary outcome variables also showed a significant immediate change towards normality that was stable during the long-term follow-up. After 3
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| 9. |
- Pagani, M, et al.
(författare)
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Regional cerebral blood flow during auditory recall in 47 subjects exposed to assaultive and non-assaultive trauma and developing or not posttraumatic stress disorder
- 2005
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Ingår i: European Archives of Psychiatry and Clinical Neuroscience. - : Springer Science and Business Media LLC. - 0940-1334 .- 1433-8491. ; 255:5, s. 359-365
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: Psychological trauma leads to posttraumatic stress disorder (PTSD) in susceptible subjects. The aim of this study was to investigate the differences in regional cerebral blood flow (rCBF) between two groups of subjects exposed to different types of traumatic stressor either developing or not developing PTSD. METHODS: Twenty subjects developing (S) and 27 not developing (NS) PTSD after being exposed to either earlier person-under-the-train accident (NA) or being assaulted in the underground environment (A) were included in the study. 99mTc-HMPAO SPECT was performed and the uptake in 29 regions of the brain (VOIs), bilaterally, was assessed. rCBF distribution was compared, using analysis of variance (ANOVA), between groups (S/NS) and type (A/NA) during a situation involving an auditory evoked re-experiencing of the traumatic event. Discriminant analysis was applied to test the concordance between clinical diagnosis and SPECT findings. RESULTS: In the general analyses significant differences were found between groups and types and there was a significant hemisphere x type interaction. S showed higher CBF than NS and so did A as compared to NA, particularly in the right hemisphere. Discriminant analysis correctly classified 66% of cases (p < 0001) in testing S/NS and 72% (p < 0001) in testing NA/A. CONCLUSIONS: Under recall of their traumatic experience we found higher relative CBF distribution values in S as compared to NS. CBF was higher in the right hemisphere and particularly in assaulted subjects. These findings underscore the role upon trauma recall of both the right hemisphere and the nature of the stressing event.
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| 10. |
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