Wave propagators are introduced for transient wave propagation in a general one-dimensional medium. The definition of wave propagators is based upon a wave splitting technique. Several properties for the propagators are given and the relations between the method of propagators and the invariant imbedding method and the Green function approach are discussed.

Popular Abstract in Swedish Under kvartärtiden (den geologiska period som omfattar de senaste ca 2,6 miljoner åren) har klimatet på Jorden varierat dramatiskt. Långa perioder (ca 100 000 år) av istid med stora inlandsisar som täckte Skandinavien, Ryssland, Sibirien, Grönland och Nordamerika har periodiskt avbrutits av kortare perioder (ca 10 000 år) av varmare klimat, så kallade interglacialer. HoThe aim of this thesis was to study annually laminated (varved) Holocene lake sediment in Sweden, their formation and their potential as chronological and palaeoecological archives. Five lakes with continuous Holocene varved lake sediment sequences in northern (Västerbotten) and west central Sweden (Värmland) were investigated. Three of these sequences were discovered during this study, which iden

Popular Abstract in Swedish Denna lilla skrift behandlar ett område inom fysiken som kallas högenergetisk tungjonsfysik. Kort förklarat betyder detta att vi studerar kärnmateria under extrema förhållanden, såsom höga temperaturer och höga tryck. För att åstadkomma dessa, kolliderar vi bly- och guldkärnor med mycket höga energier vid partikelacceleratorer, i USA (New York) och i Schweiz (Geneve). NThis thesis is about high energy heavy ion physics. Two major experiments, the WA98 at CERN and the PHENIX at Brookhaven National Laboratory, are described. Results from data analysis from both experiments are presented. The WA98 chapter presents particle identification methods and phi-meson measurements. A procedure for calculating efficiency maps for tracking chambers is discussed. The PHENIX ch

Physical activities such as long-distance running can form a habit and might be related to drug-induced addictive behaviors. We investigated possible modulations of N-methyl-D-aspartate (NMDA) receptor subunits during voluntary wheel running in brain regions implicated in reward and addiction. It was observed that Lewis rats progressively increased their amount of daily running, reaching maximum l

Purpose: The beneficial effects of antimuscarinics on detrusor overactivity and overactive bladder syndrome are exerted during bladder filling, when there is no parasympathetic outflow from the spinal cord. We tested the hypothesis that, if tolterodine exerts some of its effects on afferent nerves, the functional elimination of C-fiber afferents should affect the actions of the drug on urodynamic

A systematic review of radiation therapy trials in several tumour types was performed by The Swedish Council of Technology Assessment in Health Care (SBU). The procedures for evaluation of the scientific literature are described separately (Acta Oncol 2003; 42: 357-365). This synthesis of the literature on radiation therapy for soft tissue sarcomas (STS) is based on data from five randomized trial

The Swedish localities for Parmelia eleganrula (Zahlbr.) Szat. and Parmelia laciniatula (Oliv.) Zahlbr.wers outlined in denil by Almborn (1948) in a work on the distribution and ecology of some south Scandinavian lichens. In the summer of 1987, I revisited Ahnborn's renumerated localities in Sklne and Blekinge. Several new localiries were also registrated. Both species, as prcsumed, turned out to

Numerical finite element results on the mechanical behaviour of finger-joints for laminated timber products are presented. Simulations are based on a nonlinear fracture mechanics description of the bondlines in the finger-joints. It is shown that, for a commonly used resorcinol–phenol adhesive, there is potential of increasing substantially the finger-joint strength by increasing the fracture ener

An experimental model based on the combination of endothelial damage and flow reduction was used to induce jugular vein thrombosis in rabbits. The effect on thrombosis of a low molecular weight heparin (LMWH [Fragmin]), dextran 70, placebo and their combination was studied in a double-blind fashion with actual doses used in clinical thromboprophylaxis. Saline and polygeline were used as placebo in