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This paper treats fault detection in DC distributed power systems, with emphasis on ground faults. The difficulty of detecting ground faults arises from the fact that the AC sources and loads are ungrounded or have heavy impedance to ground, on the converter side, to effectively block zero sequence currents otherwise flowing between the AC systems. A grounding scheme for the DC distribution system
Popular Abstract in Swedish Aneurysm är ett sjukdomstillstånd som är känt sedan ca 2000 år före vår tideräkning, och bukaortaaneurysm (bråck på stora kroppspulsådern i buken) beskrivs i publikationer från 1500-talet. På 1800-talet försökte man sig på att behandla med ligering, tyvärr med dåligt resultat, och först på 1920-talet beskrivs den första lyckade ligeringen. Behandling med graftrekonstrukThe incidence of abdominal aortic aneurysms (AAA) is increasing. The risk of rupture is related to diameter. However, rupture may occur also in small AAA. To evaluate the size of an aneurysm when related to the predicted normal aortic diameter might be a better predictor of risk. AAA:s, range 40-55 mm were studied in relation to gender. No difference in AAA diameter was found. However, body surfac
Popular Abstract in Swedish Fysik försöker förklara naturfenomen med matematiska beskrivningar som beror på systemet som studeras. Även om vi till exempel vet hur man beskriver rörelsen av ett fallande äpple, blir övervägandet av detaljer som ett fallande äpple knappast relevant när man försöker beräkna jordens rörelse runt solen. Å andra sidan spelar partikelfysik ingen roll i beskrivandet av äppThis thesis considers numerical simulations of high energy particle collisions, and improvements in the description of multiple collimated jets of hadrons in collision events in particular. In the event simulation software called event generators, the structure of multi-jet events is determined through an interplay of the input calculation, parton showers and phenomenological hadronisation models.
We present a family of protograph based LDPC codes that can be derived from permutation matrix based regular (J,K) LDPC convolutional codes by termination. In the terminated protograph, all variable nodes still have degree J but some check nodes at the start and end of the protograph have degrees smaller than K. Since the fraction of these stronger nodes vanishes as the termination length L increa
SUMMARY Torsten Weimarck: ACADEMY AND ANATOMY. On the History of the Human Body in Art Instruction and Studio Practice from ca. 1600 up to ca. 1810, with Particular Emphasis on the Instruction of Anatomy at the Academies of Art in Stockholm and Copenhagen The aim of the present study is to contribute to the documentation and interpretation of the image and experience of the body by means of two
The transport processes in the porous, micro-structured electrodes are one of the least understood areas of research of the solid oxide fuel cell (SOFC). To enhance the knowledge of the transport process' impact on the performance in the electrodes, the micro-structure needs to be modeled in detail. But at these smaller scales, it can be both cost and time saving to first conclude at which scales,
This book investigates the significance processes of Americanization had had in shaping and influencing the form and content of everyday life in Sweden. However, rather than simply viewing Americanization as an irresistable homogenizing force, it is argued that to the extent that Swedish everyday life has been Americanized, it has been Americanized in a very Swedish way. Here the dreams, actions,
