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This paper presents the results of an extensive survey on incorrect protection operations performed in Sweden on an electric power system owned by Sydkraft. The survey is based on disturbance reports and special investigation reports for the period 1976-2002. The results indicate the occurrence of the major types and causes of incorrect protection operations that have been revealed at disturbances
A scheme for highly efficient storage and recall of single- and few-photon wave-packets in solid state materials (here inorganic crystals doped with rare-earth ions) is presented. The scheme is supported by experimental data showing that single-photon absorption effects can be observed in these materials and also how the materials can be tailored for the quantum state storage and reconstruction op
Popular Abstract in Swedish Denna avhandling söker nya vägar: - Nya vägar för sinnlig design som är både digital och materiell. - Nya vägar för hur designforskning och pedagogisk praxis kan utvecklas tillsammans. - Nya vägar för en forskning som värdesätter designfältets sätt att närma sig och verka i världen. Ting och rum som är tilltalande för våra sinnen, känner vi alla till. En unik typ är såThis dissertation contributes to three fields within design research: - Explorations of a design space related to aesthetics of Tangible Interaction, which have led to a set of design imaginations as well as perspectives on salient design qualities. - Views on and a designerly example of knowledge construction related to Research through Design as well as to programmatic approaches to design resea
K-shell ionization and L x-ray production cross-sections by proton impact have been determined from measurements of K x-ray yields from thin targets of Ti, Fe, Co, Cu, Ni and Ag and of L x-ray yields from Au and Pb. The proton energies varied from 1.5 to 11 MeV. A Si(Li) semiconductor detector recorded the x-rays. The total error in the measured cross-sections is mostly less than 5 %. Kβ/Kα, ratio
The dominating property of the present report concerns an approach, which is exclusively based on discontinuities as the reliable observations. In what way the presentation is designed and the main assumptions are formulated is described within an ecological context. Furthermore, a system of computer programs constitutes the background for reflection. A perspective, oriented on the environment, is
Popular Abstract in Swedish Fotosyntesen är den process i växter, alger och fotoautotrofa bakterier, där solljusets energi fångas i kemiska föreningar och levande materia. Avsikten med konstgjord fotosyntes är på lång sikt att framställa bränsle (t ex vätgas) med hjälp av solenergi och vatten, enligt fotosyntesens principer. I växter är den centrala principen för denna process, som är den viktigasPhotosynthesis is the process by which light energy is converted into chemical products, in photoautotrophic bacteria, algae and plants. The principal idea is the production of reducing agents by photo-induced oxidation of a sacrificial electron donor. Photosystem II in plants, algae and cyanobacteria, absorbs light and catalyzes the oxidation of water, liberating electrons that are used to form r
A fully integrated class-D audio power amplifier using Pulse Width Modulation (PWM) technique is presented. The output stage is an H-bridge with 5.75 min wide nMOS transistors and 15 min wide pMOS transistors, which can deliver up to 0.25 W-rms to an 16 ohm load. The chip measuring 1.2x2.4 mm(2), including pads, was fabricated in a 0.35 mu m CMOS process. It uses a single 3.3 V supply and a PWM ca
Denna bok beskriver och förklarar koncernredovisningens logik och teknik. Syftet är att både skapa principiell förståelse för koncernen som redovisningsenhet och god kunskap i koncernredovisningens teknik. Bokens innehåll kan sammanfattas i följande punkter: •Koncernredovisningsteknik •Koncernredovisningslogik •Lagar och regler •Analys av koncernredovisning Koncernredovisning innehåller
The aim of the work presented here was to provide enhanced assessment methods that are able to prove higher load carrying capacities and longer service lives for existing concrete railway bridges. One main objective was to develop methods for non-linear analysis since this provides the greatest potential to discover any additional sources for load carrying capacity, and gives an improved understan
