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  • Result 920381-920390 of 1665530
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920381.
  •  
920382.
  • Månsson, Daniel, et al. (author)
  • Modeling and Description of Pantograph Arcing
  • 2011
  • Conference paper (peer-reviewed)abstract
    • In this work the nature of pantograph arcing is studied. It originates from an imperfect contact between the catenary, delivering power to the train, and the pantograph of the train. The arc acts as a source of EMI but due to the complex nature of the arc and the associated conductor structure, it is very hard to perform direct measurements on the emitted electromagnetic fields. A model of the characteristics of the arc is proposed. This model can be used together with analytical methods or with simulation tools to investigate the electromagnetic fields and determine the threat to other sensitive systems from the field bound EMI created by these arcs.
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920383.
  • Månsson, Daniel, et al. (author)
  • On the Assessment of Written Exams and Possible Bias due to Dynamic Rater Effects Emerging from Student Initials and Rater Fatigue
  • 2016
  • In: Högre Utbildning. - : Lund universitet. - 2000-7558. ; 6:1, s. 21-30
  • Journal article (peer-reviewed)abstract
    • In this paper the possibility of an existing bias, due to the order (here by the initial letters of the family names) in which the results of the students are judged, was studied. This would constitute of a dynamic rater effect of harshness, or leniency, toward the performance of these students due to rater fatigue. A substantial dataset, consisting of 12 years of written exams, for a course, for 2512 examinees, was mined and the results analyzed. The evidence point to the fact that the assessment procedure does not favor, or disfavor, students with family names having initial letters placed late in the alphabet.
  •  
920384.
  • Månsson, Daniel (author)
  • On the Optimization of Halbach Arrays as Energy Storage Media
  • 2015
  • In: Progress in Electromagnetics Research B. - : EMW Publishing. - 1937-6472. ; 62:1, s. 277-288
  • Journal article (peer-reviewed)abstract
    • In the paper presented here the optimization of Halbach arrays as storage media for mechanical potential energy is investigated with numerical simulations using FEMM and analytical calculations using the Maxwell stress tensor. Two opposing Halbach arrays form a "magnetic spring" and mechanical potential energy is stored when this structure is compressed. It is here seen that the wavelength of the magnetization in the material and the dimensions greatly influence the stored energy density. A clear region of maximum is identified which leads to important conclusions on how the material should be employed. The suggested approach for storing energy have advantages and approximately 250 kJ/m3 can be reached. The main drawback is the large prize of rare earth metals such as Neodymium.
  •  
920385.
  • Månsson, Daniel (author)
  • On the Suitability of Using Halbach Arrays as Potential Energy Storage Media
  • 2014
  • In: Progress in Electromagnetics Research B. - : EMW Publishing. - 1937-6472. ; 58, s. 151-166
  • Journal article (peer-reviewed)abstract
    • In the work presented here, the suitability of an unusual energy storage medium is investigated. The energy storage system is based on the forceful compression of two magnetic Halbach arrays. The mass and volume energy density is obtained and compared to existing common energy storage systems. The charge and discharge times and depths are also discussed. In addition, limits and considerations, which are needed for practical implementation, e.g., risk of demagnetization, internal mechanical stresses, heating of the magnetic structure and financial efficiency are investigated.
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920386.
  •  
920387.
  • Månsson, Daniel (author)
  • SafePowNet - Undersökning av sårbarheten hos elkraftnät mot avsiktliga EM-störningar (IEMI)
  • 2011
  • Conference paper (peer-reviewed)abstract
    • En pålitlig och oavbruten elförsörjning är av yttersta vikt för ett modernt samhälles fortgång. Ett elkraftnät förlitar sig mycket på avancerad utrustning för att övervaka och styra sin distribuerade infrastruktur. Detta gör nätet mottagligt för vissa former av elektromagnetiska störningar och därmed även för avsiktliga sådana. SafePowNet har varit ett projekt lett från Sverige finansierat av EU för att undersöka sårbarheten hos elkraftnät från avsiktliga elektromagnetiska störningar.
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920388.
  • Månsson, Daniel (author)
  • Sizing Energy Storage Systems used to Improve Privacy from Smart Meter Readings for Users in Sweden
  • 2018
  • In: Proceedings - 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2018. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538645055
  • Conference paper (peer-reviewed)abstract
    • The smart power grid of the future will be heavily dependent on accurate information from the users via smart meter readings. However, from the information on the users power profile much knowledge about the behavior can be acquired, resulting in a breach of privacy. To mask the power profile an energy storage system can be used that obfuscates the smart meter readings. In this paper, we investigate the storage capacity needed if the smart meter is required to report a constant power usage for the user, electricity as well as distributed heating, to the utility. Both single and multiple users per energy storage system are investigated using both derived as well as measured power profiles.
  •  
920389.
  • Månsson, Daniel, et al. (author)
  • Susceptibility of GPS receivers and wireless cameras to a single radiated UWB pulse
  • 2006
  • Conference paper (peer-reviewed)abstract
    • This paper describes the susceptibility of handheld GPS (Global positioning system) receivers and wireless cameras to a single radiated Ultra wide band (UWB) electromagnetic pulse. Due to the wideband nature of the fields the transients can be front-door coupled through the antennas of the devices under test (DUT). “Interference Levels” were correlated with peak absolute electric field and variations in susceptibility between different orientations of the test object with respect to incident field were seen. It is concluded that these common sensitive electronic devices can easily be disturbed by a single radiated UWB transient.
  •  
920390.
  • Månsson, Daniel (author)
  • Teachers' views on course analyses and the process at KTH : "Where are all the course analyses and why are they there?”
  • 2023
  • Conference paper (peer-reviewed)abstract
    • Teachers at KTH are bound by national law and local regulations to perform course evaluations and course analyses and to make the findings and potential decisions available to the students by uploading them to the designated web portal. However, investigations of the data from this database show that few of the courses at KTH are represented herein. After interviews with teachers at KTH, there are strong indications that the faculty is in fact doing course analyses but not as stipulated. The teachers have adopted their own approaches that suit their individual situations. Analyzing the interview material using Vroom's expectancy-value theory, it is indicated that the teachers perceive the costs associated with following the stipulated process outweigh the benefits and that the values seen in performing course analyses are connected to their role as teachers.
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  • Result 920381-920390 of 1665530
Type of publication
journal article (873940)
conference paper (289688)
book chapter (144426)
doctoral thesis (94753)
reports (88034)
other publication (49965)
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book (28960)
review (28566)
research review (23048)
licentiate thesis (18018)
editorial collection (16734)
artistic work (7374)
editorial proceedings (3154)
patent (1699)
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Type of content
peer-reviewed (1030809)
other academic/artistic (552208)
pop. science, debate, etc. (81095)
Author/Editor
Zetterberg, Henrik, ... (2144)
Blennow, Kaj, 1958 (1861)
aut (1729)
Linderson, Hans (1728)
Lundälv, Jörgen, 196 ... (1623)
Harrison, Dick (1393)
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Zwalinski, L. (1332)
Nilsson, Peter (1325)
Larsson, Anders (1282)
Strandberg, Jonas (1250)
Liu, Y. (1200)
Ekelöf, Tord (1176)
Zhu, J. (1144)
Brenner, Richard (1129)
Ellert, Mattias (1120)
Aad, G (1052)
Abbott, B. (1016)
Lind, Lars (1006)
Bohm, Christian (992)
Winblad, B (979)
Zhang, J. (962)
He, Sailing (958)
Sundén, Bengt (940)
Meyer, J. (920)
Halldin, C (911)
Zhang, X. (908)
Zhang, Z. (894)
Ågren, Hans (890)
Johansson, Börje (883)
KLARESKOG, L (870)
Sundquist, Kristina (862)
Olsson, T (858)
Wang, J. (844)
Zhang, H. (842)
Lund-Jensen, Bengt (841)
Li, X. (834)
Sörlin, Sverker (830)
Sundquist, Jan (826)
Zhou, B. (822)
Yang, H. (818)
Johansson, Tord (815)
Wang, H. (811)
Chen, X. (808)
Li, J. (807)
Silverstein, Samuel ... (802)
Qian, J. (800)
Lindholm, B (799)
Evans, H. (798)
Brandt, A. (795)
Han, L. (795)
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Uppsala University (274659)
Lund University (221876)
Karolinska Institutet (201625)
University of Gothenburg (166270)
Royal Institute of Technology (133343)
Stockholm University (117452)
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Linköping University (107804)
Chalmers University of Technology (91391)
Umeå University (88483)
Luleå University of Technology (53538)
Swedish University of Agricultural Sciences (43854)
Linnaeus University (43794)
Örebro University (39745)
Karlstad University (27788)
Jönköping University (27029)
RISE (26200)
Mid Sweden University (23414)
Malmö University (20905)
Södertörn University (19924)
Mälardalen University (19444)
Högskolan Dalarna (15490)
University of Gävle (13069)
University of Borås (12628)
Halmstad University (11664)
VTI - The Swedish National Road and Transport Research Institute (10252)
Kristianstad University College (8297)
Swedish Environmental Protection Agency (8294)
Stockholm School of Economics (8213)
Blekinge Institute of Technology (8141)
University of Skövde (7518)
Swedish National Heritage Board (7202)
University West (6833)
Swedish National Defence College (4398)
The Swedish School of Sport and Health Sciences (3721)
Marie Cederschiöld högskola (3670)
Swedish Museum of Natural History (3633)
IVL Swedish Environmental Research Institute (3509)
The Nordic Africa Institute (1987)
The Institute for Language and Folklore (1788)
University College of Arts, Crafts and Design (1377)
Red Cross University College (1342)
Sophiahemmet University College (1196)
University College Stockholm (966)
Royal College of Music (604)
Stockholm University of the Arts (541)
Nationalmuseum (529)
Swedish Agency for Marine and Water Management (521)
The Royal Institute of Art (276)
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Language
English (1345104)
Swedish (274913)
Latin (12008)
German (7143)
Undefined language (6182)
French (4088)
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Spanish (2527)
Danish (2413)
Norwegian (1949)
Italian (1291)
Finnish (1258)
Russian (1140)
Polish (922)
Portuguese (617)
Chinese (533)
Dutch (419)
Japanese (353)
Arabic (253)
Greek, Modern (215)
Turkish (208)
Persian (201)
Estonian (187)
Hungarian (169)
Icelandic (159)
Czech (117)
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Ukranian (98)
Greek, Ancient (88)
Romanian (84)
Bulgarian (78)
Croatian (66)
Serbian (53)
Esperanto (50)
Korean (49)
Slovenian (42)
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Other language (30)
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Sami (11)
Irish (11)
Hebrew (10)
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Indonesian (10)
Baluchi (7)
Multiple languages (5)
Swahili (5)
Mongolian (4)
Faroese (3)
Belarusian (3)
language:Fra_t (3)
Somali (2)
Bengali (2)
Ladino (2)
Macedonian (1)
Urdu (1)
Amharic (1)
Basque (1)
Frisian (1)
Kazakh (1)
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Research subject (UKÄ/SCB)
Natural sciences (345896)
Social Sciences (328324)
Medical and Health Sciences (252275)
Engineering and Technology (236994)
Humanities (192531)
Agricultural Sciences (39264)

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