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| 2. |
- Forsström, David, et al.
(författare)
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Group versus Internet-based cognitive-behavioral therapy for procrastination : Study protocol for a randomized controlled trial
- 2015
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Ingår i: Abstracts from the 7th Swedish Congress on internet interventions (SWEsrii). - Linköping : Linköping University Press. ; , s. 20-20
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Konferensbidrag (refereegranskat)abstract
- Procrastination can be defined as a voluntarily delay of an intended course of action despite expecting to be worse-off for the delay, and is considered a persistent behavior pattern that can result in major psychological suffering, which in turn can constitute a major problem for many individuals. There a not many studies available on treating procrastination. A previous Internet based RCT with guided and unguided treatment aimed to decrease procrastination yielded positive results for individuals who volunteered to receive treatment. This current study has the aim to further increase the knowledge regarding treatment for procrastination. It is a RCT comparing unguided and group treatment aimed to decrease procrastination in a student population. Demographic data from the included participants and preliminary outcome data is presented. These results are discussed and compared to the previous RCT and other studies evaluating the effect of treatment aimed to decrease procrastination.
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| 3. |
- Rizzo, G., et al.
(författare)
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Characteristics of partial discharges in an experimental setup reproducing HVDC cable insulation operating conditions
- 2021
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Ingår i: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. - 0084-9162. ; 2021-December, s. 191-194
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Konferensbidrag (refereegranskat)abstract
- The occurrence of Partial Discharge (PD) inside a cavity subjected to HVDC voltage can be considered as one of the most likely sources of insulation ageing and failure. In practical applications, the recognition of PD under HVDC is more difficult than under AC stress because of the lower repetition rates and the impossibility to obtain a PD pattern synchronized with the waveform of the applied voltage. In this paper, the relationship between conduction phenomena in dielectrics and the occurrence of PD is investigated by means of a novel experimental setup. A couple of dielectric cells connected in series is subjected to various HVDC stress levels. The applied voltage is divided between the two cells by subjecting them to a temperature difference. The PD activity inside an air void defect existing within one of the two dielectric cell is measured by means of a PRY-CAM. This setup reproduces, to the extreme, the effect of the distribution of the electric field in an HVDC cable on PD activity when it is exposed to a thermal gradient across the insulation. In addition, an equivalent circuit model has been developed to evaluate the PD Inception Voltage (PDIV) across the cavity. The comparison between the experimental and model results demonstrates the capability of the macroscopic conduction model to reproduce the inception of PD phenomena in solid dielectrics under HVDC stress and temperature gradient.
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| 5. |
- Romano, P., et al.
(författare)
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The Effect of the Harmonic Content Generated by AC/DC Modular Multilevel Converters on HVDC Cable Systems
- 2019
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Ingår i: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. - 0084-9162. ; 2019-October, s. 666-669
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Konferensbidrag (refereegranskat)abstract
- With the increasing penetration of renewable and decentralized energy sources into the power grid, an extended use of DC voltages is expected on both distribution and transmission levels. Generation of DC voltages by means of voltage source converters is associated with a wide spectrum of harmonic distortions at converter terminals, both on the ac and on the dc sides. This can lead to partial discharges in power cables, which deteriorate insulation material thus weakening its performance and reducing cable life-time. In the previously published paper, the effect of harmonic distortion on appearance of partial discharges in cable insulation was evaluated. Here, the study related to the PD behavior has been made focusing on the influence of multilevel converter parameters such as the number of submodules and the switching frequency chosen to generate different voltage stresses. In addition, effects of using a function generator for producing desired waveform instead of the dSPACE board as in the previous work, are highlighted. In particular, it is shown implementation of the former made it possible utilizing the Pry-Cam synchronization and thus the realization of the PD pattern.
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| 6. |
- Rozental, Alexander, et al.
(författare)
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Treating procrastination using cognitive behavior therapy : A pragmatic randomized controlled trial comparing treatment delivered via the Internet or in groups
- 2017
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Ingår i: BABCP Manchester 2017. ; , s. 60-60
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Konferensbidrag (refereegranskat)abstract
- Introduction: Procrastination is a common problem among university students, with at least half of the population reporting great difficulties initiating or completing certain tasks and assignments. Procrastination can have a negative impact on course grades and the ability to achieve a university degree, but can also lead to psychological distress, such as, stress and anxiety. Cognitive Behavior Therapy (CBT) is often considered treatment of choice, but few studies have investigated its effectiveness in regular clinical settings. The current study explored its treatment effects using a pragmatic randomized controlled trial comparing treatment delivered during eight weeks as unguided self-help via the Internet (ICBT) or as group CBT. Methods: In total, 92 university students with severe procrastination were included in the study (registered as a clinical trial on Clinicaltrials.gov: NCT02112383). Outcome measures included self-reported procrastination, depression, anxiety, and physical and psychological well-being, which were distributed at pre- and post-treatment, as well as six-month follow-up. An outcome measure of procrastination was also administered weekly. Results: Linear mixed and fixed effects models were calculated, along with improvement and deterioration rates. The results showed that both unguided ICBT and group CBT yielded large within-group effect sizes on procrastination, Cohen’s d = 1.24-1.29, 95% Confidence Interval (CI) [0.76-1.74], and small to moderate benefits for depression, anxiety, and well-being, d = 0.37-0.68, 95% CI [-0.06-1.12]. In total, 32.6% were improved at post-treatment and 45.6% at follow-up. No differences between conditions were observed directly after the treatment period, however, participants in group CBT continued or maintained their improvement at follow-up, while participants in unguided ICBT showed signs of deterioration. Discussion: The findings from the current study suggest that CBT might be an effective treatment for students with problems of procrastination, but that a group format may be better for some in order to sustain their benefits over time.
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