| 1. |
- Lennermo, Gunnar, et al.
(författare)
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Control of decentralised solar district heating
- 2019
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Ingår i: Solar Energy. - Oxford : Elsevier. - 0038-092X .- 1471-1257. ; 179, s. 307-315
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of decentralised solar district heating plants is to feed solar heat directly into district heatingnetworks. This decentralised heat supply has to consider two major output conditions: a stable required feed-insupply temperature and a feed-in heat power equal to the heat output from the solar collectors. However, manyinstallations cannot achieve the second output condition, since severe oscillations appear in the feed-in heatpower. This problem can be solved by two different control concepts with either temperature- or flow-control.Detailed measurements from two reference plants are provided for these two different control concepts. Onemain conclusion is that a robust control system is characterized by the ability to provide required flows andtemperatures. The major difference between robust and less robust control is that the supply temperatures and/or flows do not fluctuate even if the input conditions are unfavourable. © 2019 Elsevier Ltd. All rights reserved.
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| 2. |
- Mecklenbräuker, Christoph, et al.
(författare)
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Vehicle-to-Vehicle Communications
- 2012
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Ingår i: Pervasive Mobile and Ambient Wireless Communications. - London : Springer London. - 9781447123156 - 9781447123149 ; , s. 577-608
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter discusses major results and conclusions from Special Interest Group C bringing together various aspects of mobile to mobile communication from all working groups. Vehicle-to-vehicle communication scenarios are emphasized. Traffic telematics applications are currently under intense research and development for making transportation safer, more efficient, and cleaner. Communication systems which provide “always on” connectivity at data rates between 1 and 10 Mb/s to highly mobile surface traffic (cars and trains) are urgently required for developing traffic telematics applications and services. Currently much attention is given to advanced active safety, but the application area also ranges to improved navigation mechanisms and infotainment services. mobile to mobile communications need to be reliable and trusted: Drivers in cars which are equipped with vehicle to vehicle communications need to rely on the accuracy and timeliness of the exchanged data. Automotive manufacturers, road authorities, broadcast companies, and telecom providers are the key players in the value chain for such future systems. These communication systems provide an extended information horizon to warn the driver or the vehicular systems of potentially dangerous situations in an early phase.
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| 3. |
- Rask, Mikael, 1958-, et al.
(författare)
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Validity and reliability of a Swedish version of the Relationship Assessment Scale (RAS) : a pilot study
- 2010
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Ingår i: Canadian journal of cardiovascular nursing. - Ottawa : Canadian Council of Cardiovascular Nurses. - 0843-6096. ; 20:1, s. 16-21
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: There is a need for a short and easily administered scale, in the Swedish language, for assessing partner relationships in the health care of persons with cardiac disease. PURPOSE: To establish the reliability and validity of the Swedish version of the Relationship Assessment Scale (RAS). DESIGN: The present pilot study has a methodological design. FINDINGS: Content validity has been tested for relevance, clarity and readability. The scale was tested for construct validity with explorative factor analysis. The reliability was tested by internal consistency and test-retest analysis. The result showed a two-factor solution, which does not correspond to the original proposed one-factor solution. The factor analyses revealed two quite distinct factors of RAS, labelled "Relationship built on expectations and satisfaction of needs" and "Relationship built on love and devotion". CONCLUSIONS: The scale has satisfactory psychometric properties in terms of content validity, construct validity, homogeneity and stability in a population of persons with cardiac disease. Wider evaluations of the RAS for other populations and settings are recommended.
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| 4. |
- Sjöberg, Katrin, et al.
(författare)
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Measuring and using the RSSI of IEEE 802.11p
- 2010
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Ingår i: 17th World Congress on Intelligent Transport Systems, ITS 2010, Busan, South Korea, 25-29 October 2010.
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Konferensbidrag (refereegranskat)abstract
- The scalability of intelligent transport systems (ITS) applications is difficult to test in a field operational test (FOT) due to the high number of ITS equipped vehicles required. Therefore, computer simulations for evaluating different wireless communication technologies for ITS different applications can serve as a complement. In this paper we present results from lab measurements conducted on the CVIS hardware platform equipped with the upcoming standard IEEE 802.11p. We have measured the packet error rate versus the signal-to-noise ratio (SNR) for different packet lengths. This lab measurement is the first step towards an outdoor measurement campaign which also considers interference. The outdoor measurements will then be fed into a computer simulator together with a realistic channel model for evaluating the scalability of VANETs in a highway scenario.
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| 5. |
- Svedberg, Petra, 1973-, et al.
(författare)
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Psychometric evaluation of “The 25-item Sex after MI Knowledge Test” in a Swedish context
- 2012
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Ingår i: Scandinavian Journal of Caring Sciences. - Malden, USA : Wiley. - 0283-9318 .- 1471-6712. ; 26:1, s. 203-208
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Tidskriftsartikel (refereegranskat)abstract
- The patients’ sexual life after a myocardial infarction is important for his/her quality of life. In spite of this, many patients are in doubt regarding their sex life after a myocardial infarction (MI) and the sexual information received, and counselling from health care providers has been seen to be insufficient. The purpose of this study was to evaluate the psychometric properties of ‘The 25-item Sex after MI Knowledge Test’ in a Swedish context. A convenience sample was recruited. The scale was translated into Swedish and completed by 79 former patients from The Heart and Lung Patients’ National Association on two occasions, with an interval of 2 weeks. The scale was tested for face and content validity, internal consistency and test–retest reliability. The result in this study indicates that the instrument has good face and content validity and displayed a moderate internal consistency (alpha 0.61). The instrument showed some level of instability in test–retest reliability with 60% of the items presenting moderate or strong agreement between the test and retest. Further studies that use this instrument in larger and more diverse samples are thus needed.
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