| 1. |
- Haghbin, Saeid, 1977, et al.
(författare)
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An integrated charger for plug-in hybrid electric vehicles based on a special interior permanent magnet motor
- 2010
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Ingår i: Vehicle Power and Propulsion Conference (VPPC) Proceedings, Sep. 2010, Lille, France. - 9781424482191
-
Konferensbidrag (refereegranskat)abstract
- For a plug-in hybrid electric vehicle (PHEV), the battery needs to be charged from the grid while the vehicle is parked. The traction system components are normally not engaged during the charging time so there is a possibility to use them in the charger system to develop an integrated charger. An innovative high power isolated three-phase bi-directional integrated charger with unit power factor operation is introduced for PHEVs based on a special configuration of the ac motor. The winding of the machine is re-arranged in charging mode to have a three-phase boost based high power battery charger. The system configuration, the device model (machine with multiple windings), traction and charging system functionality and charger control are presented in this paper.
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| 2. |
- Haghbin, Saeid, 1977, et al.
(författare)
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Integrated chargers for EV's and PHEV's: examples and new solutions
- 2010
-
Ingår i: XIX IEEE International Conference on Electrical Machines (ICEM), Rome, Italy, 2010. - 9781424441747
-
Konferensbidrag (refereegranskat)abstract
- The battery is an important component in an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV) and it should be charged from the grid in a cost efficient, preferably fast and definitely safe way. The charger could be an on board or an off board charger. For an on board charger it is possible to use available hardware of the traction system, mainly the inverter and the electric motor, in the charger circuit. This is called an integrated charger. In this paper, different examples of integrated chargers are reviewed and explained. Additionally, other possible solutions of integrated chargers are described.
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| 3. |
- Jocher, Georg, et al.
(författare)
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Apparent Winter CO2 uptake by a boreal forest due to decoupling
- 2017
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier BV. - 0168-1923 .- 1873-2240. ; 232, s. 23-34
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Tidskriftsartikel (refereegranskat)abstract
- Net uptake of carbon dioxide (CO2) was observed during the winter when using the eddy covariance (EC) technique above a 90-year-old Scots pine (Pinus sylvestris L.) stand in northern Sweden. This uptake occurred despite photosynthetic dormancy. This discrepancy led us to investigate the potential impact of decoupling of below- and above-canopy air mass flow and accompanying below-canopy horizontal advection on these measurements. We used the correlation of above- and below-canopy standard deviation of vertical wind speed (sigma(w)), derived from EC measurements above and below the canopy, as the main mixing criterion. We identified 0.33 m s(-1) and 0.06 m s(-1) as site-specific o thresholds for above and below canopy, respectively, to reach the fully coupled state. Decoupling was observed in 45% of all cases during the measurement period (5.11.2014-25.2.2015). After filtering out decoupled periods the above-canopy mean winter NEE shifted from -0.52 mu mol m(-2) s(-1) to a more reasonable positive value of 0.31 mu mol m(-2) s(-1). None of the above-canopy data filtering criteria we tested (i.e., friction velocity threshold; horizontal wind speed threshold; single-level sigma(w) threshold) ensured sufficient mixing. All missed critical periods that were detected only by the two-level filtering approach. Tower-surrounding topography induced a predominant below-canopy wind direction and consequent wind shear between above- and below-canopy air masses. These processes may foster decoupling and below-canopy removal of CO2 rich air. To determine how broadly such a topographical influence might apply, we compared the topography surrounding our tower to that surrounding other forest flux sites worldwide. Medians of maximum elevation differences within 300m and 1000 m around 110 FLUXNET forest EC towers were 24 m and 66 m, respectively, compared to 24 m and 114 m, respectively, at our site. Consequently, below canopy flow may influence above-canopy NEE detections at many forested EC sites. Based on our findings we suggest below-canopy measurements as standard procedure at sites evaluating forest CO2 budgets.
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| 4. |
- Milani, Lili, et al.
(författare)
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DNA methylation for subtype classification and prediction of treatment outcome in patients with childhood acute lymphoblastic leukemia.
- 2010
-
Ingår i: Blood. - : American Society of Hematology. - 0006-4971 .- 1528-0020. ; 115:6, s. 1214-25
-
Tidskriftsartikel (refereegranskat)abstract
- Despite improvements in the prognosis of childhood acute lymphoblastic leukemia (ALL), subgroups of patients would benefit from alternative treatment approaches. Our aim was to identify genes with DNA methylation profiles that could identify such groups. We determined the methylation levels of 1320 CpG sites in regulatory regions of 416 genes in cells from 401 children diagnosed with ALL. Hierarchical clustering of 300 CpG sites distinguished between T-lineage ALL and B-cell precursor (BCP) ALL and between the main cytogenetic subtypes of BCP ALL. It also stratified patients with high hyperdiploidy and t(12;21) ALL into 2 subgroups with different probability of relapse. By using supervised learning, we constructed multivariate classifiers by external cross-validation procedures. We identified 40 genes that consistently contributed to accurate discrimination between the main subtypes of BCP ALL and gene sets that discriminated between subtypes of ALL and between ALL and controls in pairwise classification analyses. We also identified 20 individual genes with DNA methylation levels that predicted relapse of leukemia. Thus, methylation analysis should be explored as a method to improve stratification of ALL patients. The genes highlighted in our study are not enriched to specific pathways, but the gene expression levels are inversely correlated to the methylation levels.
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| 5. |
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| 6. |
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| 7. |
- Zlatev, Jordan, et al.
(författare)
-
Stages and transitions in children’s semiotic development
- 2009
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Ingår i: Studies in Language and Cognition. ; , s. 380-401
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Stage models were prevalent in developmental psychology in the past, but have recently been subjected to much criticism. We propose “rehabilitation”, defining semiotic stage as a (not necessarily stable) period characterized by the clear establishment of a novel semiotic capacity, which may “dominate” the communication of the child at this stage, but does not replace capacities from previous stages. This is spelled out by adopting one particular model of semiotic development – the Mimesis Hierarchy (Zlatev 2008a, 2008b) – and presenting comparative and developmental data from 6 children in Sweden and Thailand, between 18 and 27 months of age, analyzing their acts of bodily communication (ABCs) in relation to their emerging linguistic capacities. The results show evidence for a transition around 20 months, when children display the use of (stable) signs, shared with their community, in both the linguistic and gestural modalities, but do not yet systematically combine them. Only towards the end of the period under study does this begin to occur on a more routine basis. Implications are drawn for the continuous debate “insight” vs. gradual development in ontogeny, suggesting a compromise.
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| 8. |
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| 9. |
- Andersson, Marcus, et al.
(författare)
-
Interfering signals and attenuation : potential problems with communication via the power grid
- 2006
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Ingår i: Proceedings of Nordic Distribution and Asset Management Conference.
-
Konferensbidrag (refereegranskat)abstract
- This paper will give a general overview of the potential problems associated with remote-meter reading via the power grid and describe some of the technologies available. A comparison will be made between the power grid as a communication channel and other, dedicated and shared, channels. Examples will be given of practical cases in which the communication channel does not function in the intended way.
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| 10. |
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| 11. |
- Andersson, Roger, et al.
(författare)
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The economy
- 1996
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Ingår i: National Atlas of Sweden: The Geography of Sweden. ; , s. 86-133
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 12. |
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| 13. |
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| 14. |
- Bagge, Niklas, et al.
(författare)
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Protecting a five span prestressed bridge against ground deformations
- 2015
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Ingår i: IABSE Conference Geneva 2015. - Geneva : International Association for Bridge and Structural Engineering. - 9783857481406 ; , s. 255-262
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A 55 year-old, 121.5 m long, five span prestressed bridge was situated in the deformation zone close to a mine in Kiruna in northern Sweden. There was a risk for uneven ground deformations so the bridge was analyzed and monitored. Results and measures taken to ascertain the robustness of the bridge are presented.The analysis resulted in an estimate that the bridge could sustain 24 mm in uneven horizontal and 83 mm in uneven vertical displacement of the two supports of a span. To be able to sustain larger deformations, the columns of the bridge were provided with joints, where shims could be inserted to counteract the settlements. To accomplish this, each one of the 18 columns of the bridge was unloaded by help of provisional steel supports. The column was then cut and a new foot was mounted to it. This made it possible to lift each individual column with two jacks, when needed, and to adjust its height by inserting or taking away shim plates.The deformations of the bridge and the surrounding ground were monitored. The eigenmodes of the bridge were studied with accelerometers and by analysis with finite elements (FE) models. Comparison indicated good agreement between the model and the actual bridge, with calculated eigenfrequencies of 2.17, 4.15 and 4.67 Hz, for the first transversal, vertical and torsional modes, respectively. Measurements during winter resulted in higher values due to increased stiffness caused by frozen materials.
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| 15. |
- Beckmann, Cecilia, 1964-
(författare)
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Diversification and strategic, long-distance partnerships : Bofors' struggle through times of crisis and uncertainty
- 2023
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This is a case study that aims to explain how the company Bofors in Karlskoga, Sweden, struggled through three periods of crisis or uncertainty, while remaining innovative. It begins in the late 19th century and ends in the early 21st century after Bofors had been divested. The investigation takes a constructivist approach and focuses on the experiences of individuals. The data consists of archived letters, interviews and secondary sources. The concept of diversification is applied to explain how Bofors, originally an ironworks acquired new technologies and skills over the years, which were combined in a number of ways, resulting in an innovative local knowledge infrastructure. This development took place while the company sought to adapt to a changing institutional environment – societal norms, rules and practices – following two world wars, disarmament and deindustrialisation. The results also show that, during each of the three periods, Bofors was dependent on long-distance partnerships with external actors to gain new knowledge or financial resources, or both. Different dimensions of proximity are applied, revealing that cognitive proximity was most important for the success of the partnerships. Partners collaborating on innovations had to share a knowledge base. And, preferably, partners’ knowledge should be complementary. But if no proximities were high during the early phase of a partnership, if partners were too far apart from cognitive, geographical, social, institutional and organisational perspectives, then geographical proximity was crucial for increasing the other proximities. To meet face-to-face was necessary in order to learn from each other and to bridge gaps in the relationship caused by partners not knowing each other and belonging to different organisations and cultures with different languages and traditions.
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| 16. |
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| 17. |
- Bienkowska, Dzamila, 1978-, et al.
(författare)
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Brain circulation and flexible adjustment : labour mobility as a cluster advantage
- 2011
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Ingår i: Geografiska Annaler. Series B, Human Geography. - : Wiley-Blackwell. - 0435-3684 .- 1468-0467. ; 93:1, s. 21-39
-
Tidskriftsartikel (refereegranskat)abstract
- This article explores the role of labour mobility as a potential cluster advantage. We review the theoretical arguments as for how and why labour mobility could enhance the dynamism and performance of clusters of similar and related firms. A combination of quantitative and qualitative data from two information and communication technology (ICT) clusters is used to answer two research questions: (1) What is the role of mobility enhancing (or restricting) institutions in clusters? (2) In what ways does labour mobility contribute to knowledge transfer within clusters? The two ICT clusters studied in the article generally seem to have higher levels of mobility, compared to the labour market at large. Although it is regarded as beneficial in theory, most cluster firms try to restrict mobility of workers since they fear the risk and costs of losing staff. Labour mobility is also rarely viewed as a viable way to increase the knowledge bases or contact networks of firms. However, when firms need to recruit the clustered labour markets seem to benefit them by facilitating the use of informal recruitment processes. By way of conclusion it is suggested that cluster firms might be under-investing in mobility and that innovative institutional solutions could help realize clusters’ mobility potential.
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| 18. |
- Bollen, Math, et al.
(författare)
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Harmonic emission from installations with energy-efficient lighting
- 2011
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Ingår i: Proceeding of the International Conference on Electrical Power Quality and Utilisation, EPQU. - Piscataway, NJ : IEEE Communications Society. - 9781467303798 ; , s. 797-802
-
Konferensbidrag (refereegranskat)abstract
- This paper presents the results from a number of measurements of the harmonic emission from installations that contain a large number of energy-efficient lamps. Two of the measurements concern the replacement of incandescent lamps with CFL and LED; the other measurement concerns an installation with up to 48 fluorescent lamps with high-frequency ballasts. The paper also contains a discussion on why the (total) power factor is not a good measure to quantify the performance of lamps or installations containing large numbers of lamps
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| 19. |
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| 20. |
- Brännström, Mats, 1958, et al.
(författare)
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The first clinical uterus transplantation trial: a six-month report.
- 2014
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Ingår i: Fertility and sterility. - : Elsevier BV. - 1556-5653 .- 0015-0282. ; 101:5, s. 1228-1236
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Tidskriftsartikel (refereegranskat)abstract
- To report the 6-month results of the first clinical uterus transplantation (UTx) trial. This type of transplantation may become a treatment of absolute uterine-factor infertility (AUFI).
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| 21. |
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| 22. |
- Chi, Jinshu, et al.
(författare)
-
The carbon balance of a managed boreal landscape measured from a tall tower in northern Sweden
- 2019
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier BV. - 0168-1923 .- 1873-2240. ; 274, s. 29-41
-
Tidskriftsartikel (refereegranskat)abstract
- Boreal forests exchange large amounts of carbon dioxide (CO2) with the atmosphere. A managed boreal landscape usually comprises various potential CO2 sinks and sources across forest stands of varying age classes, clear-cut areas, mires, and lakes. Due to this heterogeneity and complexity, large uncertainties exist regarding the net CO2 balance at the landscape scale. In this study, we present the first estimate of the net CO2 exchange over a managed boreal landscape (∼68 km2) in northern Sweden, based on tall tower eddy covariance measurements. Our results suggest that from March 1, 2016 to February 28, 2018, the heterogeneous landscape was a net CO2 sink with a 2-year mean uptake of −87 ± 6 g C m−2 yr−1. Due to an earlier and warmer spring and sunnier autumn, the landscape was a stronger CO2 sink during the first year (−122 ± 8 g C m−2) compared to the second year (−52 ± 9 g C m−2). Footprint analysis shows that 87% of the CO2 flux measurements originated from forests, whereas mires, clear-cuts, lakes, and grassland contributed 11%, 1%, 0.7%, and 0.2%, respectively. Altogether, the CO2 sink strength of the heterogeneous landscape was up to 38% lower compared to the sink strength of a mature stand surrounding the tower. Overall, this study suggests that the managed boreal landscape acted as a CO2 sink and advocates tall tower eddy covariance measurements to improve regional carbon budget estimates.
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| 23. |
- Chi, Jinshu, et al.
(författare)
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The Net Landscape Carbon Balance—Integrating terrestrial and aquatic carbon fluxes in a managed boreal forest landscape in Sweden
- 2020
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 26:4, s. 2353-2367
-
Tidskriftsartikel (refereegranskat)abstract
- The boreal biome exchanges large amounts of carbon (C) and greenhouse gases (GHGs) with the atmosphere and thus significantly affects the global climate. A managed boreal landscape consists of various sinks and sources of carbon dioxide (CO2), methane (CH4), and dissolved organic and inorganic carbon (DOC and DIC) across forests, mires, lakes, and streams. Due to the spatial heterogeneity, large uncertainties exist regarding the net landscape carbon balance (NLCB). In this study, we compiled terrestrial and aquatic fluxes of CO2, CH4, DOC, DIC, and harvested C obtained from tall-tower eddy covariance measurements, stream monitoring, and remote sensing of biomass stocks for an entire boreal catchment (~68 km2) in Sweden to estimate the NLCB across the land–water–atmosphere continuum. Our results showed that this managed boreal forest landscape was a net C sink (NLCB = 39 g C m−2 year−1) with the landscape–atmosphere CO2 exchange being the dominant component, followed by the C export via harvest and streams. Accounting for the global warming potential of CH4, the landscape was a GHG sink of 237 g CO2-eq m−2 year−1, thus providing a climate-cooling effect. The CH4 flux contribution to the annual GHG budget increased from 0.6% during spring to 3.2% during winter. The aquatic C loss was most significant during spring contributing 8% to the annual NLCB. We further found that abiotic controls (e.g., air temperature and incoming radiation) regulated the temporal variability of the NLCB whereas land cover types (e.g., mire vs. forest) and management practices (e.g., clear-cutting) determined their spatial variability. Our study advocates the need for integrating terrestrial and aquatic fluxes at the landscape scale based on tall-tower eddy covariance measurements combined with biomass stock and stream monitoring to develop a holistic understanding of the NLCB of managed boreal forest landscapes and to better evaluate their potential for mitigating climate change.
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| 24. |
- Dahm-Kähler, Pernilla, 1964, et al.
(författare)
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Transplantation of the uterus in sheep: methodology and early reperfusion events.
- 2008
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Ingår i: The journal of obstetrics and gynaecology research. - : Wiley. - 1341-8076 .- 1447-0756. ; 34:5, s. 784-93
-
Tidskriftsartikel (refereegranskat)abstract
- AIM: Uterine transplantation is developing into a clinical treatment for uterine factor infertility. An animal model with a similar uterus size and vessels to humans and with pregnancy extending over several months would be beneficial for research on uterine transplantation. The aim of this study was to develop and evaluate autotransplantation of the sheep uterus to an orthotopic position in the pelvis. METHODS: Female sheep (n=7) were subjected to laparotomy with the uterus and its vascular supply and drainage being surgically isolated. The excised uterus was kept ex vivo at +4 degrees C for 60 min and then autotransplanted with vascular end-to-side anastomoses to the external iliac vessels. The effects of uterine blood-reperfusion were assessed by measurements of pCO(2), pO(2), lactate and pH in uterine venous blood. Uterine contractility and histology was assessed after 3 h of reperfusion. RESULTS: Reperfusion of blood was observed in five out of seven transplanted uteri. The pCO(2)/pO(2)-ratio and the lactate level were initially elevated but decreased and became normal after 60 min. After 3 h of reperfusion there was a visible tissue blood flow and spontaneous uterine contractions were seen. Histological analysis revealed a mild inflammation, but no edema or stasis. CONCLUSIONS: This study demonstrates that the sheep uterus can successfully be autotransplanted to an orthotopic position with novel vascular connections. This model is suitable for future experiments studying long-term results concerning uterine viability and pregnancy using a transplanted uterus of similar size to the human uterus.
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| 25. |
- Deutschmann, Mats, et al.
(författare)
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"Let's keep it informal, guys" : a study of the effects of teacher communicative strategies on student activity and collaborative learning in internet-based English courses
- 2008
-
Ingår i: Tidskrift för lärarutbildning och forskning. - 1404-7659. ; 15:2, s. 39-57
-
Tidskriftsartikel (refereegranskat)abstract
- The paper explores the quantity and quality of communication produced by teachers in Internet courses of academic English, particularly during the initial stages of course activity. The courses are entirely conducted in virtual learning environments without physical meetings, and are part of the Bachelor programme (A–C level) of English at Mid Sweden University. The pedagogic design of the courses is based on collaborative learning, which presupposes a communicative environment with positive interdependence and interaction, where knowledge is shared by students questioning and challenging each other. Consequently, the teacher’s role in setting communicative norms which encourage an environment of high acceptance, where students feel that they can express their opinions freely, is of utmost importance. The results suggest that there are two important factors that affect student activity in the initial stages of an online course: how much the teacher communicates with the class and the manner in which he or she does so.
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| 26. |
- Deutschmann, Mats, 1964-, et al.
(författare)
-
“Let’s Keep it Informal, Guys” : a Study of the Effects of Teacher Communicative Strategies on Student Activity and Collaborative Learning in Internet-based English Courses
- 2008
-
Ingår i: Tidskrift för lärarutbildning och forskning. - Umeå : The faculty board for teacher education. - 1404-7659. ; 15:2, s. 36-58
-
Tidskriftsartikel (refereegranskat)abstract
- The paper explores the quantity and quality of communication produced by teachers in Internet courses of academic English, particularly during the initial stages of course activity. The courses are entirely conducted in virtual learning environments without physical meetings, and are part of the Bachelor programme (A–C level) of English at Mid Sweden University. The pedagogic design of the courses is based on collaborative learning, which presupposes a communicative environment with positive interdependence and interaction, where knowledge is shared by students questioning and challenging each other. Consequently, the teacher’s role in setting communicative norms which encourage an environment of high acceptance, where students feel that they can express their opinions freely, is of utmost importance. The results suggest that there are two important factors that affect student activity in the initial stages of an online course: how much the teacher communicates with the class and the manner in which he or she does so.
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| 27. |
- Eimermann, Marco, 1979-, et al.
(författare)
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Exploring Dutch migration to rural Sweden : international counterurbanisation in the EU
- 2012
-
Ingår i: Tijdschrift voor economische en sociale geografie. - : Wiley-Blackwell. - 0040-747X .- 1467-9663. ; 103:3, s. 330-346
-
Tidskriftsartikel (refereegranskat)abstract
- This paper explores whether the concept of counterurbanisation, expanded with an international dimension, offers a valuable framework for understanding recent migration flows from the Netherlands to Sweden. Using a geo-referenced database comprising demographic and socio-economic variables, the post-migration employment status, employment sector and settlement location of Dutch migrants in Central Sweden are analysed. In addition, results from observation, interviews and a survey during emigration fairs are employed to describe the motives for migration from the Netherlands to Central Sweden. We argue that counterurbanisation is not an exhausted research topic, when international political, economic and socio-cultural factors are added to the study.
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| 28. |
- Eimermann, Marco, 1979-
(författare)
-
There and back again? : Dutch lifestyle migrants moving to rural Sweden in the early 21st century.
- 2013
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis has a twofold aim. First, it studies motivations and decision processes of Dutch families moving to rural Sweden, with a focus on Hällefors municipality in the Bergslagen area. Second, it explores how this migration flow can be conceptualised within migration theory. The results of the study are presented in four papers.The migrants’ characteristics are explored using variables from the Bergslagen Database. This is complemented with data from interviews with municipality officials, project leaders and Dutch families in rural Sweden.The theoretical framework consists of literature on counterurbanisation, the creative class thesis and lifestyle migration. The creative class thesis has inspired many rural place marketing projects and efforts to attract the ‘right type’ of people to stimulate rural development. Based on the interview study, I argue that lifestyle migration research offers most apt insights into the act of migration within the wider life trajectories of these Dutch families.The thesis offers new empirical data that suggest amendments to be made to the academic definition of lifestyle migration. Additional contributions consider the novel geographic direction of the migration flow (northwards), the destination (a deprived area) and the structure framing the decision process; a local authority and its deliberate attempts to attract new residents from abroad. The findings suggest transcending four binaries. First, in the context of an integrating EU, the thesis adds international dimensions to the initial story of internal counterurbanisation. Second, these flexibly mobile families transcend and combine issues of urbanity and rurality through access- facilitating technology and cheap means of long distance transport. Third, this study reiterates the importance of production as a complement to consumption in lifestyle migration research. Finally, the thesis adds dynamic issues of transience to the static permanent-temporary binary of migration.
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| 29. |
- Eklund, Petter, 1989-
(författare)
-
Rare Earth Metal–Free Permanent Magnet Generators
- 2016
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Permanent magnet (PM) synchronous generators (SGs) are used in renewable energy production. The preferred PM material is neodymium-iron-boron (NdFeB), which has very high performance and, until recently, low cost. In recent years there has emerged a cost and supply insecurity in NdFeB PMs due to export restrictions imposed by China, where the majority of the raw materials are produced. In this thesis various methods of avoiding the use of PM materials based on NdFeB, or other rare earth metals, are investigated.One approach is the use of the cheap and abundant ferrite PM. A ferrite PM rotor intended to be interchangeable with an NdFeB PM rotor is designed and built. Some initial investigation of the performance of the new rotor, and how this relates to manufacturing tolerances, is also made.Another approach is to make parameter studies in anticipation of new PM materials. A study of how three different rotor topologies perform with different PM materials, described by their remanence and recoil permeability, is made. The rotor topologies are: a spoke type PM rotor, a surface mounted PM rotor and a capped PM rotor.It is concluded that a viable replacement rotor can be designed using ferrite PMs. The new rotor will be heavier and mechanically more complex, and give slightly lower output voltage. Losses in the machine will increase slightly. A study is made on the impact of manufacturing tolerances on the performance of the resulting rotor.The different rotor topologies work best with different PM material properties. The surface mounted PM and capped PM rotors require higher remanence for good performance; the spoke type PM rotor works well with larger amounts of low remanence material. The recoil permeability should be low for the surface mounted and high for the capped PM rotor.
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| 30. |
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| 31. |
- Felton, Adam, et al.
(författare)
-
Replacing monocultures with mixed-species : Ecosystem service implications of two production forest alternatives in Sweden
- 2016
-
Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 45:Suppl. 2, s. 124-139
-
Tidskriftsartikel (refereegranskat)abstract
- Whereas there is evidence that mixed-species approaches to production forestry in general can provide positive outcomes relative to monocultures, it is less clear to what extent multiple benefits can be derived from specific mixed-species alternatives. To provide such insights requires evaluations of an encompassing suite of ecosystem services, biodiversity, and forest management considerations provided by specific mixtures and monocultures within a region. Here, we conduct such an assessment in Sweden by contrasting even-aged Norway spruce (Picea abies)-dominated stands, with mixed-species stands of spruce and birch (Betula pendula or B. pubescens), or spruce and Scots pine (Pinus sylvestris). By synthesizing the available evidence, we identify positive outcomes from mixtures including increased biodiversity, water quality, esthetic and recreational values, as well as reduced stand vulnerability to pest and pathogen damage. However, some uncertainties and risks were projected to increase, highlighting the importance of conducting comprehensive interdisciplinary evaluations when assessing the pros and cons of mixtures.
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| 32. |
- Felton, Adam, et al.
(författare)
-
Replacing monocultures with mixed-species stands : Ecosystem service implications of two production forest alternatives in Sweden
- 2016
-
Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 45, s. 124-139
-
Tidskriftsartikel (refereegranskat)abstract
- Whereas there is evidence that mixed-species approaches to production forestry in general can provide positive outcomes relative to monocultures, it is less clear to what extent multiple benefits can be derived from specific mixed-species alternatives. To provide such insights requires evaluations of an encompassing suite of ecosystem services, biodiversity, and forest management considerations provided by specific mixtures and monocultures within a region. Here, we conduct such an assessment in Sweden by contrasting even-aged Norway spruce (Picea abies)-dominated stands, with mixed-species stands of spruce and birch (Betula pendula or B. pubescens), or spruce and Scots pine (Pinus sylvestris). By synthesizing the available evidence, we identify positive outcomes from mixtures including increased biodiversity, water quality, esthetic and recreational values, as well as reduced stand vulnerability to pest and pathogen damage. However, some uncertainties and risks were projected to increase, highlighting the importance of conducting comprehensive interdisciplinary evaluations when assessing the pros and cons of mixtures.
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| 33. |
- Forsberg, Gunnel, 1950-, et al.
(författare)
-
Demografiska myter : Föreställningar om landsbygden - mer myter än faktiska fakta
- 2012
-
Bok (populärvet., debatt m.m.)abstract
- Storstäder associeras med spännande och kreativa miljöer med oväntade möten medan landsbygden påminner oss om harmoni och trivsamt tempo i omgivningar där alla känner alla. Men både den urbana miljön och den rurala har också ett antal problem att handskas med. Vissa, som till exempel segregationen i storstadsmiljöerna, är relativt väldokumenterade och analyserade, medan andra bygger mer på myter och föreställningar utan empiriskt stöd. På samma sätt finns värderingsmässiga uppfattningar om huruvida det är i stadsmiljö eller i landsbygdsmiljö det goda livet kan levas.
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| 34. |
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| 35. |
-
Fram träder Bergslagen : Nytt ljus över gammal region
- 2009
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Proceedings (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Hur ska vi förstå Bergslagens som region? Mystiskt, folkligt och kreativt har regionen nyligen karakteriserats. Ibland talas om "bruksandan" och om en region med stora svårigheter att förnya sig. Stämmer detta? Forskare från en rad discipliner vid Bergslagens lärosäten delar här med sig av sina forskningsresultat om regionen.
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| 36. |
- Golovliov, Igor, 1958-, et al.
(författare)
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Long-Term Survival of Virulent Tularemia Pathogens outside a Host in Conditions That Mimic Natural Aquatic Environments
- 2021
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Ingår i: Applied and Environmental Microbiology. - : Elsevier. - 0099-2240 .- 1098-5336. ; 87:6, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- Francisella tularensis, the causative agent of the zoonotic disease tularemia, can cause seasonal outbreaks of acute febrile illness in humans with disease peaks in late summer to autumn. Interestingly, its mechanisms for environmental persistence between outbreaks are poorly understood. One hypothesis is that F. tularensis forms biofilms in aquatic environments. We utilized two fully virulent wild-type strains: FSC200 (Francisella tularensis subsp. holarctica) and Schu S4 (Francisella tularensis subsp. tularensis) and three control strains, the attenuated live vaccine strain (LVS; F. tularensis subsp. holarctica), a Schu S4 DwbtI mutant that is documented to form biofilms, and the low-virulence strain U112 of the closely related species Francisella novicida. Strains were incubated in saline solution (0.9% NaCl) microcosms for 24 weeks at both 4°C and 20°C, whereupon viability and biofilm formation were measured. These temperatures were selected to approximate winter and summer temperatures of fresh water in Scandinavia, respectively. U112 and Schu S4 DwbtI formed biofilms, but F. tularensis strains FSC200 and Schu S4 and the LVS did not. All strains exhibited prolonged viability at 4°C compared to 20°C. U112 and FSC200 displayed remarkable long-term persistence at 4°C, with only 1- and 2-fold log reductions, respectively, of viable cells after 24weeks. Schu S4 exhibited lower survival, yielding no viable cells by week 20. At 24weeks, cells from FSC200, but not from Schu S4, were still fully virulent in mice. Taken together, these results demonstrate biofilm-independent, long-term survival of pathogenic F. tularensis subsp. holarctica in conditions that mimic overwinter survival in aquatic environments.
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| 37. |
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| 38. |
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| 39. |
- Gustavsson, Eva, 1956-
(författare)
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Mellan det lokala och det globala : klimat, kommuner, nätverk
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Between the local and the global: climate, local governments, networks The notion of an ongoing global warming is shared by a large number of researchers and decision-makers around the world. Through the act of signing the UN Framework Convention on Climate Change a majority of the world's naitons have accepted the idea of human induced climate change, and to develop national climate change mitigation programmes. The Kyoto protocol later quantified the commitments made by the nations. The issue of climate change has become a political issue of its own. In the European Union as well as in Sweden and other nations, climate mitigation goals, programmes and strategies are developed. This is also the situation on the local level, for example in Swedish municipalities, which is the context of this study. Local goverment is an important actor in climate mitigation, both as a political organization in its own right and as an arena involving actors from different sectors in society. Climate change mitigation measures conducted by local governments re partly shaped by national grant programmes. The study shows, however, that the local context - the palce - with its natural prerequisites, economic structures and composition of actors, is just as decisive for how the local climate policies are developed and implemented. It also shows that although responsibility for the environment is an important driving force in local climate mitigation there are at least two other dirving forces; local and regional development and the symbolic valute of being in the forefront of climate change mitigation. Another arena where actors in climate change mitigation meet is the network. Together wiht actors from different sectors and levels many municipalities participate in various networks, with local to global extension. The fact that the netsorks like climate change in inself transcends political and administrative borders, is alsö addressed theoretically in the study, focusing upon the concepts of re-scaling, multilevel governance and network governance, which constitute the theoretichal fram of the thesis.
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| 40. |
- Gustavsson, Eva, 1956-, et al.
(författare)
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Multilevel governance, networking cities and the geography of climate-change mitigation : two Swedish examples
- 2009
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Ingår i: Environment and Planning. C, Government and Policy. - : Sage Publications. - 0263-774X .- 1472-3425. ; 27:1, s. 59-74
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Tidskriftsartikel (refereegranskat)abstract
- What geographical and instiutional conditions are important for initiating and sustaining climate-change mitigation at the local level? Taking this question as a point of departure, we analyze local climate mitigation as a case of multilevel network governance. This is illustrated by the case of two Swedish cities, which are both involved in city networking in favour of climate-change mitigation. Different business structures and other local conditions in significant ways influence both the level of ambition and the climate-policy strategies of the two cities, The sheer size and intensity of the networking activities clearly illustrate the fact that cities are increasingly becoming arenas of globalization, rather than passive victims of global forces, thus confirming the call for a multilevel netork-governance approach in policy and politics as well as in research.
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| 41. |
- Haghbin, Saeid, 1977, et al.
(författare)
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A Combined Motor/Drive/Battery Charger Based on a Split-Windings PMSM
- 2011
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Ingår i: 7th IEEE Vehicle Power and Propulsion Conference, VPPC 2011, Chicago, 6-9 September 2011. - 9781612842486
-
Konferensbidrag (refereegranskat)abstract
- An integrated motor/drive/battery charger is proposed, designed and simulated for vehicles using grid power to charge the system batteries. The machine stator windings are re-configured by a relay-based switching device for charging to constitute a special grid connected generator. This rotary generator (machine with re-configured windings) provides an isolated three-phase power source for the inverter to make a three-phase boost battery charger. The system design and operation in the charging and traction modes are explained for the proposed integrated motor/drive/battery charger. The charging power is half of the traction power for the proposed system. Simulation results are provided to verify the proper operation for the proposed system.
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| 42. |
- Haghbin, Saeid, 1977, et al.
(författare)
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An Integrated 20-kW Motor Drive and Isolated Battery Charger for Plug-In Vehicles
- 2013
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Ingår i: IEEE transactions on power electronics. - 0885-8993 .- 1941-0107. ; 28:8, s. 4013-4029
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Tidskriftsartikel (refereegranskat)abstract
- For vehicles using grid power to charge the battery, traction circuit components are not normally engaged during the charging time, so there is a possibility to use them in the charger circuit to have an on-board integrated motor drive and battery charger. An isolated high-power three-phase integrated motor drive and charger based on a split-phase permanent magnet motor is presented in this paper. The motor winding connections are reversible by a relay-based switching device for traction and battery charging. In traction mode, the motor is a classical three-phase motor, but in charging mode it is a rotating isolating transformer providing a three-phase voltage source for the inverter to charge the battery. A mathematical model of the motor with six stator windings is presented for an arbitrary phase shift in windings. For the charging mode, the split-phase motor grid synchronization process and charge control are explained including the developed controller. A 20-kW system is designed and implemented to verify the proper operation of the proposed system. Simulation and practical results are provided to show the system performance in terms of functionality, dynamic response, and efficiency. Moreover, some discussions, recommendations, and limitations are provided to give more practical insights.
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| 43. |
- Haghbin, Saeid, 1977, et al.
(författare)
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An Isolated High-Power Integrated Charger in Electrified-Vehicle Applications
- 2011
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Ingår i: IEEE Transactions on Vehicular Technology. - 1939-9359 .- 0018-9545. ; 60:9, s. 4115-4126
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Tidskriftsartikel (refereegranskat)abstract
- For electric and hybrid vehicles that use grid power to charge the battery, traction circuit components are not normally engaged during the charging time; hence, there is a possibility of using the traction circuit components in the charger circuit to have an onboard integrated charger. An isolated high-power integrated charger based on a special electrical machine with a double set of stator windings is described. Through the reconfiguration of the motor stator windings in the charging mode, a six-terminal machine is achieved. The so-called motor/generator acts as an isolated three-phase power source after synchronization with the utility grid in the charging mode. This rotary isolated power source constitutes a three-phase boost rectifier (battery charger) with full utilization of the inverter. The motor windings are reconfigured by a relay-based switching device for the charging and traction modes. This paper presents the mathematical model of the motor/generator and explains the system's functionality for the traction and charging modes. Furthermore, the charger grid synchronization and charge control are described. Finally, the simulation results are presented for a practically designed system with a traction power of 25 kW and a possible charge power of 12.5 kW.
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| 44. |
- Haghbin, Saeid, 1977, et al.
(författare)
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Grid-Connected Integrated Battery Chargers in Vehicle Applications: Review and New Solution
- 2013
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Ingår i: IEEE Transactions on Industrial Electronics. - 0278-0046 .- 1557-9948. ; 60:2, s. 459-473
-
Tidskriftsartikel (refereegranskat)abstract
- For vehicles using grid power to charge the battery, traction circuit components are not engaged during the charging time, so there is a possibility to use them in the charger circuit to have an onboard integrated charger. The battery charger can be galvanically isolated or nonisolated from the grid. Different examples of isolated or nonisolated integrated chargers are reviewed and explained. Moreover, a novel isolated-high-power three-phase battery charger based on a split-phase permanent-magnet motor and its winding configuration is presented in this paper. The proposed charger is a bidirectional high-power charger with a unity power factor operation capability that has high efficiency.
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| 45. |
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| 46. |
- Han, Mengjie, 1985-, et al.
(författare)
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Intra-urban location of stores and labour turnover in retail
- 2019
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Ingår i: International Review of Retail Distribution & Consumer Research. - : Informa UK Limited. - 0959-3969 .- 1466-4402. ; 29:4, s. 359-375
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of this paper is to analyse labour turnover in retail firms with stores in different city locations. This case study of a Swedish mid-sized city uses comprehensive longitudinal register data on individuals. In a first step, an unconditional descriptive analysis shows that labour turnover in retail is higher in out-of-town locations, compared to more central locations in the city. In a second step, a generalized linear model (GLM) analysis is conducted where labour turnover in downtown and out-of-town locations are compared. Firm internal and industry factors, as well as employee characteristics, and location-specific factors are controlled for. The results indicate that commuting costs and intra-urban location have no statistically significant effect on labour turnover in retail firms. Instead, firm internal factors, such as human resource management, has a major influence on labour turnover rates. The findings indicate that in particular firms with multiple locations may need to pay extra attention to work conditions across stores in different places in a city, in order to avoid diverging levels of labour mobility. This paper complements previous survey-based studies on labour turnover by using a comprehensive micro-level dataset to analyse revealed rather than stated preferences concerning job-to-job mobility. An elaborated measure of labour turnover is used to analyse differences between shopping areas in different locations within the city. The particular research design used in this paper makes it possible to isolate the effect of intra-organizational conditions by analysing mobility within firms with workplaces in both downtown and out-of-town locations. This is the first comprehensive study of labour turnover and mobility with an intra-urban perspective in the retail sector.
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| 47. |
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| 48. |
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| 49. |
- Hedfeldt, Mona, 1979-
(författare)
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Företagande kvinnor i bruksort : arbetsliv och vardagsliv i samspel
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The Bergslagen region in Sweden has a history of iron and steel production, and in the small industrial towns in the region, one large employer has often held a strong position. Although the region has gone through structural change since the 1970’s, in previous research, becoming self-employed is perceived of as difficult, since it implies going against a strong working culture. The image of Bergslagen is that of a non-entrepreneurial region. Furthermore, in previous research, the gender contract in the region is characterized as traditional. In this thesis light is shed on women in the region who are self-employed. Topics that are focused on are work experience, role models, family situation and networks. The study builds on qualitative interviews and longitudinal registry based statistics (1993-2003). The interviews were carried out in the municipalities of Norberg and Fagersta with self-employed women in the fields of health and business services. Conclusions drawn concern both the region Bergslagen as an entrepreneurial region and the lives of self-employed women. The situations and conditions under which women become and remain self-employed displays a complex interaction between different areas of life, both in relation to the start-up phase and the subsequent running of their businesses. The idea of the region as non-entrepreneurial is scrutinized. For one, the share of self-employed in the Bergslagen municipalities only differs among men, compared to the national average. The share of self-employed women in the region, however, is similar to the national average. Furthermore, the share of self-employed men and women varies among the municipalities within the region. Thus, it is problematic to speak of the region as non-entrepreneurial and as homogenous when it comes to self-employment and entrepreneurship. These findings indicate that the idea of the region as non-entrepreneurial is an expression of both the region being male coded and women entrepreneurs being subordinated.
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| 50. |
- Ivener, Ramona, 1978-
(författare)
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Kunskapens händer : Kunskapstraditioner, maskulinitet och förändring i Lesjöfors 1940-2010
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Lesjöfors, located in the municipality of Filipstad in Värmland, has a mining history dating back to the 1600s. In the mid-1970s, however, Lesjöfors, like Bergslagen at large, suffered from the international recession, and structural change had a major impact on this region, affecting society as well as individuals. These transformations form the basis of this thesis.In today’s society, knowledge or training is constantly in demand. However, the political context does not always allow for a consideration of the impact of decisions on small local communities and individuals in rural areas. Even the most well-intentioned politician and decision-maker may find themselves in the cultural trap of seeing "the others", "ordinary people" in a certain light or perspective. In a world that increasingly emphasizes knowledge, it is important to discuss what this development actually means to people.This thesis investigates the importance of local knowledge traditions in a mining district during an eventful historical phase. The main focus is on men and the role that local knowledge traditions – including knowledge patterns and knowledge ideals – have played in their choice of education. The study covers the period 1940-2010, which was marked by both industrial progress and drastic decline, and offers the opportunity to identify change over time.The study shows that there are clear trends in today's society to educate people, get them to break with the past, adopt new lifestyles and rational approaches. In Lesjöfors it is no longer possible to live the way people used to, that is, like their ancestors, to enter the industry as they reach full maturity. This means that the need to adapt to the requirements of a new situation while retaining the knowledge and identity of the past creates social conflicts of interests and an ambivalent situation for the individual.
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