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  • 54901.
    Öberg, Tomas
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öberg, T. Experience in teaching the concepts of variability and uncertainty in environmental risk analysis2008In: Annual Meeting of the Society for Risk Analysis, Boston, Massachusetts, 7-10 december , 2008., 2008Conference paper (Other academic)
  • 54902.
    Öberg, Tomas
    et al.
    Studsvik AB, Nyköping 61182, Sverige.
    Aittola, Jussi-Pekka
    Bergström, Jan
    Chlorinated aromatics from the combustion of hazardous waste1985In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 14, no 2, p. 215-221Article in journal (Refereed)
    Abstract [en]

    The production and emission of chlorinated aromatics from a hazardous waste incinerator were shown to be influenced by the operating conditions. The emissions of chlorinated benzenes, PCDD and PCDF show statistically significant correlations to the chlorine input. Different substance groups also correlate, and the results presented correspond well with a general formation mechanism of chlorophenols via chlorobenzenes as indicated by others.

  • 54903.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Allhammar, Göran
    Chlorinated aromatics from metallurgical industries: Process factors influencing production and emissions1989In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 19, no 1-6, p. 711-716Article in journal (Refereed)
    Abstract [en]

    The emission and production of chlorinated aromatics from metallurgical industries, e g scrap-metal re-melting, show substantial variations due to a number of process factors. The data evaluated indicates clearly that the production of chlorinated aromatics is combustion controlled.

  • 54904.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    A review of probabilistic risk assessment of contaminated land2005In: Journal of Soils and Sediments, ISSN 1439-0108, E-ISSN 1614-7480, Vol. 5, no 4, p. 213-224Article in journal (Refereed)
    Abstract [en]

    Background, Aims and Scope. The management and decisions concerning restoration of contaminated land often require in-depth risk analyses. An environmental risk assessment is generally described as proceeding in four separate steps: hazard identification, dose-response assessment, exposure assessment, and risk characterization. The risk assessment should acknowledge and quantify the uncertainty in risk predictions. This can be achieved by applying probabilistic methods which, although they have been available for many years, are still not generally used. Risk assessment of contaminated land is an area where probabilistic methods have proved particularly useful. Many reports have appeared in the literature, mostly by North American researchers. The aim of this review is to summarize the experience gained so far, provide a number of useful examples, and suggest what may be done to promote probabilistic methods in Europe and the rest of the world. Methods. The available literature has been explored through searches in the major scientific and technical databases, WWW resources, textbooks and direct contacts with active researchers. A calculation example was created using standard simulation software. Results and Discussion. Uncertainty and variability are part of every risk assessment. Much work on risks from contaminated soil has focussed on exposure, and choice and structure of the exposure model is then a basic uncertainty factor. Other factors, e.g. parameter uncertainty, are easier to characterize. Variability can be separated into inter-individual, spatial and temporal components. Both uncertainty and variability in the exposure variables can be investigated using Monte Carlo simulation methods. These simulations enable not only the estimation of the probability for a given risk or exposure, but also add information on the sensitivity of the various input variables. This will assist the assessor in further refining the risk analysis. The large number of applications published encompasses soil contamination by lead, arsenic, chromium, uranium, polychlorinated biphenyls (PCB), polycyclic aromatic hydrocarbons (PAH), hexachlorobenzene, pentachlorophenol and chlorinated solvents. Probabilistic risk assessments have been used in widely different settings, such as the metallurgical industry (mining and smelting operations), manufacturing, gas plants, wood impregnation, infrastructure, and waste landfills. Site-specific remediation goals can be specified using probabilistic methods, and a guideline document has been issued within the US Superfund programme. The usability of probabilistic risk assessment is illustrated by a calculation example. The current Swedish generic guideline value for benzo[a]pyrene in contaminated soil, with ingestion of vegetables as the major route of exposure, is compared with a probabilistic estimate. The toxicological reference value corresponds well with the upper 95th percentile of the estimated variability in intake, but does not account for uncertainty in the partition coefficients. Conclusions and Outlook. The probabilistic approach to risk assessment has proved its value in characterizing variability and uncertainty, and thereby contributing to a more informed and transparent decision-making process. The management of contaminated land is a major environmental application for probabilistic risk assessments. A substantial number of studies have been published and the method is now well established in the scientific community. This development has progressed further in the United States than elsewhere, but similar applications are now being reported from Europe and Asia. Probabilistic risk assessment is used to derive soil guideline values in the United Kingdom, and other countries may be anticipated to follow. However, efficient use of probabilistic methods for risk assessment of contaminated land requires certain components. There is a requirement for quality assurance and transparency that can be met by guidelines specifying data requirements and which items to report on. Both federal and state governments in the United States have issued such guidelines, and we see a similar need from a European perspective. A second component, necessary for a successful implementation of probabilistic methods, is education. We have ourselves developed undergraduate curricula, but we also see a need for continuous education of risk assessors and decision makers. The third component required is case studies, showing how probabilistic risk assessment can be implemented successfully in the cleanup of contaminated land. Most published studies originate from the United States, so here too there is a need for the rest of the world to catch up. In addition to the three components mentioned, there is an obvious need to develop and improve methods and practice of risk communication.

  • 54905.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Probabilistisk riskbedömning. Sannolikhetsbaserad uppskattning av miljö- och hälsorisker i förorenade markområden – en litteraturöversikt2005Report (Other academic)
  • 54906.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Filipsson, Monika
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Catalytic effects by metal oxides on the formation and degradation of chlorinated aromatic compounds in fly ash.2008In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 71, no 6, p. 1135-43Article in journal (Refereed)
    Abstract [en]

    Polychlorinated benzenes, dibenzo-p-dioxins (PCDD), and dibenzofurans (PCDF) may be formed below the combustion temperature in fly ash from municipal solid waste incinerators (MSWI). Copper catalyzes this formation, possibly by the Deacon reaction. Many other elements are also Deacon catalysts or promoters, and here we report results from a statistically designed experiment with 15 metal oxides added to fly ash and heated at 300 degrees C for 2h in an air atmosphere. A resolution IV fractional factorial design with four replicates was completed in 36 runs with the oxides of magnesium, yttrium, titanium, vanadium, niobium, chromium, molybdenum, tungsten, manganese, iron, cobalt, nickel, copper, zinc, and tin. All samples were analyzed for chlorinated benzenes and the results were evaluated by analysis of variance. The addition of copper significantly increased the amounts of the chlorinated benzenes, while cobalt, chromium and vanadium decreased the net formation. The oxides of zinc and iron seemed to have a slightly positive and negative effect respectively. The findings in this study seem to corroborate our previously reported results regarding the different catalytic effects of copper and chromium, and lack of a significant effect by nickel. Besides chromium, it also identifies cobalt and vanadium as potent catalysts for oxidative degradation of the chlorinated aromatic compounds found in MSWI fly ash.

  • 54907.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öberg, Erik
    Different catalytic effects by copper and chromium on the formation and degradation of chlorinated aromatic compounds in fly ash.2007In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 41, no 10, p. 3741-3746Article in journal (Refereed)
    Abstract [en]

    Fly ash from municipal solid waste incineration may catalytically enhance the formation and degradation of chlorinated aromatic compounds. The activities of three Deacon catalysts in this process were investigated in a statistically designed experiment. Chlorides of copper, chromium, and nickel were added to fly ash samples and the resulting samples heated at 300 degrees C for 2 h in an air atmosphere. The addition of copper increases the formation of all chlorinated aromatic compounds except the low chlorinated congeners of polychlorinated dibenzo-p-dioxins and dibenzofurans. The addition of chromium decreased the formation of most chlorinated aromatic compounds except the highest chlorinated species, where it was without effect. The addition of nickel did not show any significant effect. The outcome of the experiment can be interpreted as two competing processes: the chlorination of aromatic rings and the oxidation of carbon-carbon and carbon-oxygen bonds. The delicate balance between chlorination and oxidation could probably be further exploited to minimize both the emissions and the net production of chlorinated aromatic compounds from combustion.

  • 54908.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Combustion test data from a Swedish hazardous waste incinerator1986In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 15, no 9-12, p. 2045-2048Article in journal (Refereed)
    Abstract [en]

    Here we present results from our tests with PCB-incineration at the SAKAB hazardous waste incinerator in Norrtorp, Sweden. Combustion tests were made with PCB both as a fluid (Arochlor 1242) and as a contaminant of solid waste (Arochlor 1016 in capacitors). A general conclusion was that the incineration of considerable amounts of PCB did not effect the production of PCDD and PCDF in this combustion plant.

  • 54909.
    Öberg, Tomas
    et al.
    STUDSVIK AB, S-61182 NYKOPING, SWEDEN .
    Bergström, Jan
    Dioxins from Scandinavian waste combustion plants1986In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 15, no 9-12, p. 2041-2044Article in journal (Refereed)
    Abstract [en]

    A large quantity of emission data for PCDD and PCDF have been reported to date. Less information is available concerning the controlling parameters for the production of chlorinated aromatics from waste combustion. Here we report results and conclusions from investigations carried out in the Scandinavian countries to date.

  • 54910.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Emission and chlorination pattern of PCDD/PCDF predicted from indicator parameters1987In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 16, no 6, p. 1221-1230Article in journal (Refereed)
    Abstract [en]

    The emission and chlorination pattern of polychlorinated dioxins and dibenzofurans from waste combustion shows a close covariation with that of chlorinated benzenes and phenols. This covariation can be utilized to predict the emission levels of specific isomers as well as the pattern of congeners.

  • 54911.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Halogenated aromatics from waste incineration – indicator parameters1987In: American Flame Research Committee, 1987Conference paper (Other academic)
  • 54912.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Hexachlorobenzene as an indicator of dioxin production from combustion1985In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 14, no 8, p. 1081-1086Article in journal (Refereed)
    Abstract [en]

    The production of polychlorinated dioxins and dibenzofurans shows a strong correlation with the production of hexachlorobenzene. Hexachlorobenzene can be used as an indicator for the production of chlorinated aromatics.

  • 54913.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Indicator Parameters for PCDD/PCDF1989In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 19, no 1-6, p. 337-344Article in journal (Refereed)
    Abstract [en]

    Relations between different chlorinated aromatics have been evaluated in 66 samples from various industrial activities. For municipal waste combustion partial least squares modelling with latent variables (PLS) can explain 86 % of the variance in PCDD/PCDF from the isomerspecific analytical data for chlorinated benzenes and phenols.

  • 54914.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Indicator parameters for PCDD/PCDF: plant specific models1992In: Organohalogen Compounds, ISSN 1026-4892, Vol. 8, p. 197-200Article in journal (Refereed)
    Abstract [en]

    Previously presented results have shown that the emissions of PCDD/PCDF can be modelled and predicted from less costly and more precise isomerspecific analyses of different chlorinated benzenes and phenols. The new results we report here comes from a study aimed to further utilize these possibilities and develop specific models for each plant to accomplish maximum precision and accuracy in the calibration process. Plant specific models have been developed for two municipal waste combustion (MWC) facilities and one metallurgic industry.

  • 54915.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergström, Jan
    Organiska mikroföroreningar från stålverk1988Report (Other academic)
    Abstract [sv]

    Miljökonsulterna har på uppdrag av Jernkontoret värderat mätningarna av organiska mikroföroreningar från nio svenska stålverk utförda under tiden 1985 till och med 1987.

    Mätningarna utgör enbart kortvariga stickprov. Så finns t ex utsläppet till luft av polycykliska aromatiska kolväten, PAH, endast dokumenterade med 13 analyserade prov. För TCDD-ekvivalenter är antalet redovisade prov 18 stycken. Intervallet mellan de högsta och lägsta uppmätta utsläppen är för PAH 8 till 920 mg/ton stål och för TCDD-ekivalenter <0.3 till 9 µg/ton. Det är därför inte möjligt att ur mätresultaten beräkna ett realistiskt värde för normalutsläpp från stålverken idag.

    Det föreligger en tydlig samvariation av mängden PAH och klorerade aromater i utsläppet från de olika stålverken. Det är därför rimligt att utgå från att bildning och destruktion av föroreningarna är i huvudsak förbränningsstyrda förlopp. Mätresultaten styrker därmed att utsläppen kan minimeras genom relativt enkla insatser för att höja oxidationsnivån genom efterförbränning av processgaserna.

  • 54916.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Darnerud, Per-Ola
    Hajslova, Jana
    Miljögifter i fisk 2001/2002: Vänern och Vättern.2003Report (Other academic)
    Abstract [sv]

    Vätternvårdsförbundet och Vänerns vattenvårdsförbund har genomfört en undersökning av miljögifter i fisk som omfattar 38 kemiska ämnen och ämnesgrupper samt "dioxiner" (PCDD/PCDF) och PCB (polyklorerade bifenyler). I undersökningen ingår dels ämnen från den normala livsmedelskontrollen, dels de ämnen som anges i EUs vattendirektiv. Analyserna av "EU-ämnena" har genomförts med stöd från Naturvårdsverket som är delfinansiär av projektet. De fiskarter som har undersökts är lax (Vänern), öring, röding (Vättern) och lake. Undersökningen ger därmed en relativt heltäckande bild av föroreningssituationen vad gäller fisk i Sveriges två största insjöar.

    Analyserna av samlingsprov har utförts av Livsmedelsverket, Umeå universitet och ALcontrol AB. De flesta av de analyserade föroreningarna saknades helt i fiskproven. När det gäller allmänna miljöföroreningar så är det främst mjukgörare, ytaktiva ämnen och några enkla lösningsmedel som har detekterats. Däremot saknas spår av de flesta avvecklade och nu godkända icke-klorerade bekämpningsmedel, dock med tennorganiska föreningar som ett viktigt undantag.. Samma iakttagelse är även giltig för icke-klorerade polycykliska aromatiska kolväten (PAH). Av redovisning framgår att det främst är långlivade klororganiska föreningar som kan påvisas hos de flesta fiskarterna.

    En tydlig minskning av klororganiska föreningarna skedde under 1970- och början av 1980-talet. Sedan dess har nivåerna legat relativt stabila. Kvicksilver, PCDD/PCDF och dioxinlika PCB är de ämnesgrupper som ligger högst i relation till de nivåer som har angetts som tolerabla från ett folkhälsoperspektiv. Det finns därför skäl att koncentrera undersökningsinsatserna till dessa grupper av miljöföroreningar. Klart är dock att medelhalten av PCDD/PCDF i fet fisk från Vänern och Vättern ligger under EUs nuvarande gränsvärde på 4 pg/g färskvikt.

    Långlivade klorerade miljögifter fortsätter alltså att vara ett bekymmer, men när de gäller bekämpningsmedel så är det inte längre ett nationellt problem. Den statistiska utvärderingen av föroreningsmönstret tyder på att både klorerade bekämpningsmedelsrester och PCB kan härröra från långväga transport eller från någon typ av "depåer" (ifrån tidigare utsläpp och användning). Däremot samvarierar PCDD, PCDF och hexaklorbensen inbördes, men endast i begränsad utsträckning med de övriga miljöföroreningarna. Då alla tre substansgrupperna kan bildas i högtemperaturprocesser så är det inte en orimlig hypotes att dessa föroreningar främst har sitt ursprung i närområdet.

  • 54917.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Deming, Stanley. N.
    Find optimum operating conditions fast2000In: Chemical engineering progress, ISSN 0360-7275, E-ISSN 1945-0710, Vol. 96, no 4, p. 53-59Article in journal (Refereed)
    Abstract [en]

    In today's world of intense financial competition, chemical processes must be optimized quickly if they are to become successful. These successful processes must continue to be operated optimally if they are to retain their competitive edge. In this article, we discuss statistically-based optimization strategies that can be used to achieve these two goals of achieving and maintaining optimized processes.

  • 54918.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Filipsson, Monika
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Exposure factors: How to characterize the data?2007In: Annual Meeting of the Society for Risk Analysis, San Antonio, Texas, 9-12 december 2007, 2007Conference paper (Other academic)
  • 54919.
    Öberg, Tomas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Iqbal, Muhammad Sarfraz
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    The chemical and environmental property space of REACH chemicals2012In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 87, no 8, p. 975-981Article in journal (Refereed)
    Abstract [en]

    The European regulation on chemicals, REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals), came into force on 1 June 2007. With pre-registration complete in 2008, data for these substances may provide an overview of the expected chemical space and its characteristics. In this paper, using various in silico computation tools, we evaluate 48782 neutral organic compounds from the list to identify hazardous and safe compounds. Two different classification schemes (modified Verhaar and ECOSAR) identified between 17% and 25% of the compounds as expressing only baseline toxicity (narcosis). A smaller portion could be identified as reactive (19%) or specifically acting (2.7%), while the majority were non-assigned (61%). Overall environmental persistence, bioaccumulation and long-range transport potential were evaluated using structure-activity relationships and a multimedia fugacity-based model. A surprisingly high proportion of compounds (20%), mainly aromatic and halogenated, had a very high estimated persistence (> 195 d). The proportion of compounds with a very high estimated bioconcentration or bioaccumulation factor (> 5000) was substantially less (6.9%). Finally, a list was compiled of those compounds within the applicability domain of the models used, meeting both persistence and bioaccumulation criteria, and with a long-range transport potential comparable to PCB. This list of 68 potential persistent organic pollutants contained many well-known compounds (all halogenated), but notably also five fluorinated compounds that were not included in the EINECS inventory. This study demonstrates the usability of in silico tools for identification of potentially environmentally hazardous chemicals.

  • 54920.
    Öberg, Tomas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Iqbal, Muhammad Sarfraz
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    The REACH space of organic chemistry and hazard properties.2011In: Presentation vid 6th International Symposium on Computational Methods in Toxicology and Pharmacology Integrating Internet Resources (CMTPI-2011) i Maribor, 3-7 september, 2011., 2011Conference paper (Other academic)
  • 54921.
    Öberg, Tomas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Liu, Tao
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Extension of a prediction model to estimate vapor pressures of perfluorinated compounds (PFCs)2011In: Chemometrics and Intelligent Laboratory Systems, ISSN 0169-7439, E-ISSN 1873-3239, Vol. 107, no 1, p. 59-64Article in journal (Refereed)
    Abstract [en]

    Perfluorinated compounds (PFCs) are persistent and have been found globally as environmental contaminants. Release into the environment can occur from manufacturing, industrial and consumer uses. The vapor pressure is an important physical property influencing both the release and the environmental partitioning, but few reliable experimental determinations are available. Here we update a previous PLS regression model to cover also this compound class, using only a few calibration compounds. The recalibration is accomplished by applying a leverage-based weighting scheme that is generally applicable in updating structure–property relationships. The predictive performance is validated with an external validation set and is considerably better than for other standard estimation software, both with regard to accuracy and precision. The model can be given a chemical interpretation and the prediction error for the liquid vapor pressure is within 0.2 log units of Pa. Finally, the model is applied and vapor pressure estimates are reported for more than 200 PFCs where no reliable experimental data are available.

  • 54922.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Liu, Tao
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Global and local PLS regression models to predict vapor pressure2008In: QSAR & combinatorial science (Print), ISSN 1611-020X, E-ISSN 1611-0218, Vol. 27, no 3, p. 273-279Article in journal (Refereed)
    Abstract [en]

    The vapor pressure is a key property in determining the distribution and fate of environmentally relevant compounds, but experimental determinations are only available for alimited number of the chemicals in current commercial use. Despite experimental efforts there is a need for estimation methods. The liquid or subcooled liquid vapor pressures at 298.15 K were collected from the literature for a diverse set of 1340 organic compounds. Theoretical molecular descriptors were derived after optimization to low-energy conformations and used to investigate the performance of global and local Quantitative Structure – Property Relationships (QSPR). A global PLSR model with ten latent variables was found to be optimal. The predictive performance of this model, within the domain of applicability, was estimated at n=420, Q2Ext0.980, and RMSEP=0.410 (log Pa). This model can be used in conjunction with other estimation models to assess the potential for a long range atmospheric transport.

     

  • 54923.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Liu, Tao
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Linear free energy relationships and latent variable methods: Similarity in modelling environmentally relevant properties2009In: SETAC Europe 19th Annual Meeting i Göteborg, 31 maj-4 juni, 2009Conference paper (Other academic)
  • 54924.
    Öberg, Tomas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Liu, Tao
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Updating existing QSAR models: selection and weighting of new data2010In: Journal of Cheminformatics, ISSN 1758-2946, E-ISSN 1758-2946, Vol. 2, no Suppl 1, p. P19-Article in journal (Other academic)
    Abstract [en]

    Computational chemistry and quantitative structure-activity relationships (QSAR) are foreseen to be extensively used in the implementation of the new REACH regulation for chemicals in Europe. However, for some compound groups the data are too few in number to permit both calibration and testing of a new model. Usage and previously developed or updated models are then viable alternatives.Perfluorocarboxylic acids (PFCAs) and fluoroteleomer alcohols (FTOHs) are two groups of environmentally relevant compounds, with unique physical and chemical properties. The subcooled liquid vapour pressure (pL) is one such property, where experimental determinations are limited and far from consistent [1]. Updating is, however, challenging when the new compounds are far outside of the original calibration domain space. But by carefully selecting and weighting only three new compounds, we have been able to update a previously developed general QSAR model [2], to cover the new domain while maintaining predictive performance for the earlier calibration and test data. The optimal weighting scheme was determined from the sample leverages and residuals in the calibration phase [3].The performance of this re-calibrated model greatly surpassed previous modelling attempts [4], when applied to an external test set of two PFCAs and four FTOHs with pL in the range 0.2-200 Pa; with Q2Ext = 0.994 and RMSEP = 0.190 units of log Pa. The domain coverage also increased from 1% to 51%, for 426 perfluoroalkylated compounds selected from the REACH registration list, the PhysProp database, and the OECD 2006 survey [5]. Selection and weighting of new calibration data can thus facilitate the extension and use of existing QSAR models. This investigation was supported by the EU FP7 project CADASTER (grant agreement no. 212668).

  • 54925.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Neuer-Etscheidt, Katja
    Nordsieck, Hermann
    Zimmermann, Ralf
    Dioxin surrogates: a comparison of approaches2002In: Organohalogen Compounds, ISSN 1026-4892, Vol. 59, p. 37-44Article in journal (Refereed)
  • 54926.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Peltola, Pasi
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Deposition of persistent organic pollutants under a high voltage power line2009In: Posterpresentation vid NOSA Aerosol Symposium i Lund, 12-13 november, 2009., 2009Conference paper (Other academic)
  • 54927.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Peltola, Pasi
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Increased deposition of polychlorinated biphenyls (PCBs) under an AC high voltage power line2009In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 43, no 39, p. 6168-6174Article in journal (Refereed)
    Abstract [en]

    There is considerable public concern regarding the potential risks to health of electromagnetic fields in general and high-voltage power lines in particular. As epidemiological findings are not supported by a clearly defined mechanism of direct magnetic field interactions with the human body, potential indirect effects are of interest. It has been suggested that an increased exposure to chemical pollutants could occur near high-voltage power lines due to formation and deposition of charged aerosols. The current study reports empirical evidence that seems to support this hypothesis. The deposition of 18 congeners of polychlorinated biphenyls (PCBs) was studied by collecting samples of pine needles under a 400 kV AC power line and at reference sites in the vicinity. Compared to the reference sites, the average deposition of PCB congeners under the power line was almost double. This difference between the two groups of samples was statistically significant. While it is premature to draw any conclusions regarding the human exposure near high-voltage power lines, the issue deserves attention and further investigations

  • 54928.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Sander, Per
    Bergbäck, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Probabilistisk riskbedömning – fas 22006Report (Other academic)
  • 54929.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Sörme, Louise
    Chemicals in statistics - a source for information on environmentally relevant compounds?2009In: 12th EuCheMS International Conference on Chemistry and the Environment i Stockholm, 14-17 juni, 2009Conference paper (Other academic)
  • 54930.
    Öberg, Tomas
    et al.
    ENVIRONM CONSULTANTS STUDSVIK, S-61182 NYKOPING, SWEDEN .
    Warman, Kristofer
    Bergström, Jan
    Brominated aromatics from combustion1987In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 16, no 10-12, p. 2451-2465Article in journal (Refereed)
    Abstract [en]

    The production of brominated aromatics from combustion was shown to be influenced by the operating conditions. Brominated aromatics also showed high yields compared to their chlorinated analogues.

  • 54931.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Warman, Kristofer
    Bergström, Jan
    Bromine and waste incineration: an environmental risk?1990In: Organohalogen Compounds, ISSN 1026-4892, Vol. 2, p. 339-342Article in journal (Refereed)
    Abstract [en]

    Process factors influencing the production of brominated aromatics in waste incinerators are bromine load and combustion quality. Emission measurements do not indicate unacceptable environmental risks from controlled combustion and advanced flue gas cleaning.

  • 54932.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Warman, Kristofer
    Bergström, Jan
    Distribution of toxic coplanar PCBs and PCDD/PCDF in pine needles from the Swedish environment: evaluation of data and source identification1990In: Organohalogen Compounds, ISSN 1026-4892, Vol. 1, p. 449-452Article in journal (Refereed)
    Abstract [en]

    Environmental samples from different areas of Sweden indicate a widespread contamination of toxic coplanar PCBs. Uncontrolled combustion (e.g. fires) is a likely source.

  • 54933.
    Öberg, Tomas
    et al.
    Miljökonsulterna i Studsvik AB (Environmental Consultants).
    Warman, Kristofer
    Miljökonsulterna i Studsvik AB (Environmental Consultants).
    Bergström, Jan
    Miljökonsulterna i Studsvik AB (Environmental Consultants).
    Production of chlorinated aromatics in the post-combustion zone and boiler1989In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 19, no 1-6, p. 317-322Article in journal (Refereed)
    Abstract [en]

    The production of halogenated aromatics has been investigated in the SAKAB hazardous waste incinerator, Norrtorp, Sweden. The measurement results show that there is a substantial net production of chlorinated aromatics in the boiler.

  • 54934.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öhrström, T.
    Chlorinated aromatics from combustion: influence of chlorine, combustion conditions and catalytic activity2003In: Environmental Science & Technology, ISSN 0013-936X, Vol. 37, no 17, p. 3995-4000Article in journal (Refereed)
  • 54935.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öhrström, Tomas
    Bergström, Jan
    Chromium as a potential catalyst in the thermal formation of chlorinated aromatic compounds2004In: Organohalogen Compounds, ISSN 1026-4892, Vol. 66, p. 1001-1005Article in journal (Refereed)
  • 54936.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öhrström, Tomas
    Bergström & Öhrström.
    Bergström, Jan
    Bergström & Öhrström.
    Metal catalyzed formation of chlorinated aromatic compounds: a study of the correlation pattern in incinerator fly ash.2007In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 67, no 9, p. S185-S190Article in journal (Refereed)
    Abstract [en]

    Chlorinated aromatics are unintentionally formed and released from combustion and other thermal processes involving organic matter and chlorine. The catalytic activity of incinerator fly ash in the low-temperature formation of chlorinated aromatics has been demonstrated in both laboratory experiments and full-scale trials. Copper has been shown to be an effective catalyst, but several other transition metals possess a similar activity. Here results are reported from a series of full-scale combustion trials with different fractions of household and industrial wastes, with waste from forestry as a reference fuel. The composition of elements and chlorinated aromatics in the fly ash was evaluated with principal component analysis and partial least squares regression. The observed correlation pattern indicates that metals other than copper are of equal importance for the catalytic activity. Chromium and nickel are two of these metals, which may contribute to the de novo formation of chlorinated benzenes, phenols, PCDD and PCDF.

  • 54937.
    Öberg, Tomas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Öhrström, Tomas
    Bergström, Jan
    The correlation pattern of fly ash components: Chromium as a potential catalyst in the thermal formation of chlorinated aromatic compounds2004In: Environmental Chemistry, ISSN 1448-2517, E-ISSN 1449-8979, Vol. 1, no 1, p. 18-21Article in journal (Refereed)
    Abstract [en]

    Chlorinated aromatic compounds are unintentionally released from combustion sources into the environment. This thermal formation is catalyzed by fly ash components and much interest has been focussed on the role of copper. This study report results from a series of 16 full-scale trials with different fuel compositions. The correlation pattern of fly ash components seem to suggest that the catalytic effect may be due also to other metal oxychlorination catalysts. Chromium shows particularly strong and statistically significant correlations with many of the chlorinated phenols, benzenes, dibenzo-p-dioxins (PCDDs), and dibenzofurans (PCDFs).

  • 54938.
    Öberg-Grufman, Ewa
    University of Kalmar, School of Human Sciences.
    IT och lärande: En studie av mediepedagogiska arbetssätt2009Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete är en fallstudie som har till syfte att identifiera och utvärdera mediepedagogiska arbetssätt i gymnasieskolan med hjälp av IT. Studien har utförts under ett läsår med en klass som tilldelats egna bärbara datorer. Under året har jag undervisat klassen i programhantering samtidigt som jag periodvis har deltagit som observatör i klassens undervisning i andra ämnen. Jag har sedan i samråd med undervisande lärare valt ut några alternativa arbetssätt som vi har provat. De arbetssätt som vi har använt oss av är Wiki, video, stillbilder i kombination med eget ljud samt tidning och broschyr. Eleverna har också fått kunskaper i hur man använder Internet som informationskälla på ett kritiskt och korrekt sätt. Utvärderingen av de olika arbetssätten utfördes med hjälp av en enkät. Den visade att alla var positiva till att arbeta på alternativa sätt och att de arbetssätt vi provat var väl lämpade då de tillåter såväl kreativitet och kommunikation som samarbete över ämnesgränser. Både elever och lärare visade sig positiva till en fortsatt användning av alternativa arbetssätt. Eleverna har under året byggt upp tillräckliga kunskaper för en fortsättning medan flertalet lärare inte ansåg sig ha tillräckliga kunskaper för att klara av en fortsättning på egen hand.

  • 54939.
    Ödhall, Matilda
    et al.
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Lindesson, Amanda
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Lagen om anmälningsskyldighet: Ur ett klient perspektiv2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning

    Civilekonomuppsats i företagsekonomi, Ekonomihögskolan vid Linnéuniversitetet, VT 2013.

    Författare: Amanda Lindesson och Matilda Ödhall

    Handledare: Andreas Jansson

    Examinator: Anna Stafsudd

    Titel: Lagen om anmälningsskyldighet - Ur ett klientperspektiv

    Bakgrund: Lagen om revisorers anmälningsskyldighet innebär att revisorer i Sverige enligt lag är skyldiga att anmäla sina klienter då misstanke om ekonomisk brottslighet föreligger. Då såväl revisorer som deras klienter lyder under anmälningsskyldigheten, påverkas bägge parter av den. För revisorerna är det av stor vikt att ha en god relation till sina klienter och det blir därför av intresse att undersöka om anmälningsskyldigheten får några effekter på klientrelationen. För att undersöka detta krävs att bägge parters åsikt belyses för att slutsats ska kunna dras. I denna undersökning görs en jämförande undersökning på klienternas perspektiv mot tidigare genomförda undersökningar på revisorernas perspektiv. På så vis fås en helhets bild av båda parters åsikt om såväl anmälningsskyldigheten i sig och de eventuella effekterna på relationen dem emellan.

    Syfte: Syftet med denna undersökning är att kartlägga klienternas kännedom och inställning till anmälningsskyldigheten och om detta stämmer överens med revisorernas uppfattning om sina klienter. Vidare vill vi utforska ifall klientens faktiska kännedom och inställning påverkar förtroendet och om detta får effekter på relationen till dess revisor.

    Metod: Vi genomförde en kvantitativ metod i form av en enkätundersökning. Denna enkät skickades ut till 1000 svenska aktiebolag och resulterade i 102 svar.

    Resultat/Slutsatser: Undersökningens slutsats visade att klienterna ställde sig positiva till anmälningsskyldigheten men att de även hade en låg grad av kännedom om dess innebörd. Detta stämde väl överrens med revisorernas åsikt om sina klienter. Vi fann vidare inga belägg för att anmälningsskyldigheten skulle inverkat på klienternas förtroende för revisorn och därmed leda till effekter på klientrelationen. Det är klientens förväntningar som påverkar deras förtroende för revisorn och dessa verkar inte ha förändrats tillföljd av anmälningsskyldigheten. Orsaken till det oförändrade förtroendet beror förmodligen på att klienterna redan införandet av anmälningsskyldigheten förväntade sig att revisorer hade till uppgift att upptäcka ekonomiska oegentligheter.

  • 54940.
    Ödlund, Lars-Olof
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Varför sågas så lite björk i Sverige?: Why isn't more birch wood being sawn in Sweden?2009Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Summary in English

     

    Sweden is a forest country with a standing wood balance of more than 3 000 million m3sk. Pine and spruce are dominating species but there is also a wood balance of some 420 million m3sk of birch. Birch is offering excellent timber properties and is well matching both pine and spruce with the exception of its sensitivity to moisture. Despite of this, quite small quantities of birch timber are being used in Sweden. Most birch wood being cut is used for the production of paper and pulp (95%). Although the birch tree is an old species in Sweden it was during the 2000th century until the end of the 1970s treated as a weed and was struggled with by means of herbicides. Subsequently Sweden lost knowledge and experience in how to deal with this wood which in turn leads to a poor quality of now existing clumps of birch trees. Compared to coniferous trees little research has been done of broadleaf trees but it’s anyhow known that the clearing and thinning of birch trees have to be stricter than that of softwood. Birch trees have an interesting potential with a shorter production cycle than pine and spruce. Used for timber the yield for the forest owner could be quite interesting. Broadleaf trees are also playing an important role to improve the overall environment.

     

    To increase the use of birch wood more information about this specific timber has to be spread to all parties concerned. That involves owners of forest land, silviculture, sawmills, industry and distributors. Activities along the chain of actors have to be market oriented and include economic incentives for parties concerned. To be able to increase the volume of birch timber used new areas of deployment have to be found outside the traditional production of furniture etc. An interesting area is then the building industry.

  • 54941.
    Ödén, Emelie
    Linnaeus University, Faculty of Arts and Humanities, Department of Film and Literature.
    Krigsskildringar i bilderböcker: Hur krig beskrivs och gestaltas i fyra bilderböcker med koppling till svenskundervisning i grundskolans senare år och på gymnasiet2019Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna studie analyserar fyra bilderböcker: Den långa, långa resan av Ilon Wikland och Rose Lagercrantz (1995), Tänk dig att fly av Pimm van Hest (2018), Flykten av Francesca Sanna (2016) samt Dagen då kriget kom av Nicola Davis (2018). Bilderböckerna skildrar barn som faller offer för krig och deras resa till fredligare länder. Studiens syfte är att undersöka skildringen av krig i bilderböcker och hur dessa kan tillämpas i svenskundervisningen i grundskolans senare år samt i gymnasiet.

    Studien visar att bilderböckerna i hög grad använder samma tekniker för att skildra krig: färger, stilfigurer och relationen mellan text och illustrationer. Trots teknikernas likheter används de på mycket olika sätt i bilderböckerna, vilket skapar stora skillnader i berättandet. Dessa skillnader skulle med fördel kunna belysas i svenskundervisningen för att i enlighet med internationell forskning stärka elevers språkliga utveckling.

  • 54942.
    Ödén, Emelie
    Linnaeus University, Faculty of Arts and Humanities, Department of Swedish Language.
    Två versioner av Utvandrarna: En undersökning av läsbarheten i Vilhelm Mobergs Utvandrarna och dess adaption utifrån ett andraspåksperspektiv2018Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsen undersökte skillnader mellan klassikern Utvandrarna av Wilhelm Moberg (2013/1949) och dess adaption Utvandrarna adapterad av Cecilia Danielsson (2015/1949). Danielssons mål var att adaptera Utvandrarna till en lättläst roman till den stora läsegrupp svenskar på ca 2 miljoner som har svårt att läsa (Sundin 2007 s.26).Kvantitativa metoder användes för att studera meningslängd, fundament, ordval samt textbindning i de två verken. Sedan jämfördes verkens olika resultat med varandra och analyserades. I denna studie undersöktes också hur dessa variabler påverkade verkens läsbarhet utifrån ett andraspråks perspektiv.I studien framkom det att med längre meningslängder och fundament, fler högfrekventa ord utan förklaringar och mindre textbindning har verket Utvandrarna av Vilhelm Moberg (2015/1949) en lägre läsbarhet än dess adaption Utvandrarna (Moberg 2015/1949) adapterad av Cecilia Danielsson.

  • 54943.
    Öfver, Axel
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages.
    Beaucoup d’élèves abandonnent leur étude du français : Qui est à blâmer, l´élève ou le système scolaire?: Les facteurs les plus importants quant à la motivation d’un élève en train d’apprendre le français.2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A language didactic study was conducted regarding the motivation of students ranging from the age of 12 up to the age of 19 using correlative surveys and interviews as empirical foundation. Previous research has indicated an alarming rate of student dropouts from modern language learning whereas this study tried to explain the different factors that determined the motivation of a language student. The findings seem to have concluded that the number of factors that determine the level of motivation are numerous and correlative in their nature. This study suggests that it is the student that has the biggest influence over their own intrinsic motivation that in turn determines his willingness to learn, but that the school system and the social relations around the student also play a determining role. 

  • 54944.
    Öfverbeck, Niklas
    Linnaeus University, Faculty of Humanities and Social Sciences, School of Language and Literature.
    Fostrad av döden: En studie av karaktärer i Neil Gaimans "The Graveyard Book"2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 54945.
    Öfverberg, Thanja
    Linnaeus University, Faculty of Health, Social Work and Behavioural Sciences, School of Education, Psychology and Sport Science.
    Förskolläraren och genusuppdraget2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med min undersökning går ut på att ta reda på hur förskollärare ser på sitt fostransansvar i den egna verksamheten och om man arbetar genusmedvetet. I min undersökning har jag intervjuat ett antal förskollärare och jag har använt mig av en kvalitativ undersökningsmetod. Med hjälp av intervjuerna försöker jag belysa följande problemställningar: Hur ser förskollärarna på sitt uppdrag att fostra flickor och pojkar? Hur går förskollärare tillväga i sitt dagliga arbete? Vilka svårigheter upplever förskollärare nr de försöker arbeta genusmedvetet?

    I undersökningen framkommer det att några förskollärare försöker tänka genusmedvetet och arbetar därefter, men att man inte lyckas hålla fokus hela tiden. Någon pedagog föredrar att se till individen och tror att man på det viset behandlar barnen lika oavsett kön. Videoobservationer ses som ett medel för att bli mer medveten om sina egna brister vad gäller genus och därigenom kunna bli mer medveten om sitt eget bemötande av barnen. Här menar pedagogen även att man nog gärna tror sig vara bättre än vad man är. En förskollärare lyfter fram vikten av att inte lägga några värderingar i det som barnen gör. Det framkommer dessutom att det finns många äldre förskollärare med ett äldre synsätt som gör förändringsprocessen tungrodd och att det bland annat därför handlar om att ta myrsteg. Som pedagog och vuxen påverkar man barnen genom sina egna intressen, värderingar och normer som man har med sig från barnsben. I övrigt så arbetar pedagogerna tematiskt i förskolan och i temat ska innehållet från styrdokumenten in på ett eller annat sätt. Man prioriterar inga specifika mål utan försöker få med allt i temaarbetet som dessutom ska utgå ifrån barnens egna tankar och intressen.

  • 54946.
    Öfverman, Jakob
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Information Presentation in Search Engines on Mobile Devices2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis discusses the possibilities to visualise the presentation layer of a search engine on a mobile device in an alternative way. Previous work in the area has shown that the use of text-based-lists can be problematic when accessed on a device with a limited display. In the scope of the thesis and in order to tackle the current problems when displaying the results a literature review was carried out. The findings of the review formed the basis for a requirement definition on which a mock-up was developed. The mock-up was then evaluated and tested during a usability test where a number of users got to experience the alternative presentation layer that uses a visualisation technique called tree- map. The results from the test show that the mock-up could be seen as a alternative to the current presentation of results. The mock-up also shows that a future implementation could also include the use of categories and sorting of information in order to provide content with a meaning.

  • 54947.
    Öggesjö, Filip
    et al.
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Bergsteinsson, Philip
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Ekonomistyrning i växande SMEs: En fallstudie på två svenska företag i byggbranschen2019Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: What is clear early in the problem discussion and background is the importance of developing adequate management accounting when organizations grow. Based on the assumption that management accounting develops as companies grow we problematize on the subject and how it affects SMEs in strong growth.

    Purpose: The purpose of the thesis is to increase and deepen the understanding of how management accounting develops in rapidly growing SMEs. The purpose is also to identify the critical events and factors that have taken place during the growth which have caused changes in their respecitive management accounting.

    Method: The study is of a qualitative nature in the form of a multiple-case study. The primary data collection has been made using semi-structured interviews. Interviews have been conducted with both leading people and employees to create an idea of how the management has developed over time in the two companies.

    Conclusion: What characterizes management accounting in the case companies is partly a series of critical events that has affected decisions and future development of the companies. In addition, both external and internal effects have contributed to the critical events and development of the companies. Finally, the companies have acted to adapt their management accounting as they have had rapid growth, a work that is consistently characterized by a gradual development to meet the needs that have arisen.

  • 54948.
    Öggesjö, Filip
    et al.
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Bergsteinsson, Philip
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Walfridson, Christoffer
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Att genomföra en strategiförändring: En fallstudie på Visma Spcs i Växjö2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Bachelor Thesis 15hp, Business Program, School of Business and Economics at Linnaeus University, Controller, 2FE20E, VT 2018

    Title: Implementing a Strategic Change - A Case Study on Visma Spcs

    Authors: Philip Bergsteinsson, Christoffer Walfridson, Filip Öggesjö

    Examiner: Elin Funck

    Tutor: Anders Jerreling

    Background and problem: Strategy work is a process consisting of two parts, formulation and execution. Companies that execute a strategy change are facing major challenges. Business strategy studies have shown that companies do not achieve their full potential and that there are a number of difficulties in strategy execution.

    Purpose: The purpose of the essay is to test the model of strategy execution that Kaplan and Norton have created and how it’s followed in an active strategy change. The essay will provide insight into the pitfalls and obstacles of the strategy implementation.

    Method: The study that has been conducted is a case study of a qualitative nature. The empirical material has been collected by means of semi-structured interviews.

    Conclusion: Visma Spcs is in the middle of the Vision 2020 process, a strategy change started in 2016. During these years, they have been working hard to formulate, implement, communicate, and get employees to understand Vision 2020 in order for the entire organization to work towards the common goals. The study highlights a number of problems Visma Spcs has with the strategy change, some are part of communication and knowledge about the strategy others are how to work with the process. Kaplan and Norton have created a process in six steps for strategy implementation, a process that, according to the purpose of the paper, is tested in this study. There have been identified some similarities with Visma Spcs strategy implementation and the theory, but also a number of deviations. The main points of the paper's conclusion are that Visma Spcs needs to work more with communication and feedback around Vision 2020.

  • 54949.
    Öggesjö, Mikael
    et al.
    Linnaeus University, Faculty of Business, Economics and Design, Linnaeus School of Business and Economics.
    Lexander, Robin
    Linnaeus University, Faculty of Business, Economics and Design, Linnaeus School of Business and Economics.
    Partnerskapets påverkan: Vilken påverkan har revisionsbolagens ägarstruktur på revisionens kvalitet?2011Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Examensarbete, Civilekonomprogrammet, Ekonomihögskolan vid Linnéuniversitetet, 4FE03E Examensarbete Redovisning 30 hp, VT 2011

    Författare: Robin Lexander och Mikael ÖggesjöHandledare: Professor Sven-Olof Yrjö Collin

    Titel: Partnerskapets påverkan – Vilken påverkan har revisionsbolagens ägarstruktur på revisionens kvalitet?

    Bakgrund: Revisorslagen (2001:883) reglerar att 75 procent av rösterna i ett revisionsbolag skall ägas av kvalificerade revisorer. Lagen innebär konkret att revisionsbolagen ägs av individer verksamma inom bolaget, och detta fenomen benämns populärt partnerskap. Forskning om revision belyser dock sällan revisionsbolagens ägande, vilket medfört att det finns en begränsad kunskap om hur revisionsarbetet påverkas av partnerskapet.

    Syfte: Uppsatsens syfte är att förstå och förklara hur olika aspekter i revisionsbolagens partnerskap påverkar revisionens kvalitet, för att på så sätt kunna uttala oss om vilken inverkan partnerskapet har på denna variabel. 

    Metod: För att utreda hur partnerskapet och dess struktur påverkar revisionskvaliteten görs tre olika empiriska datainsamlingar: dokumentgranskning, intervjuer och enkätundersökning. Datan som samlas in är både kvalitativ och kvantitativ, och uppsatsen har både ett deduktivt och ett induktivt angreppssätt. 

    Slutsats: Studiens resultat visar att partnerskapet påverkar revisionskvaliteten positivt, där en större andel partners av totalt antal anställda leder till en högre revisionskvalitet. När uppsatsens teoretiska resonemang relaterades till den empiriska datan fann vi underlag för att utveckla en ny teori, partnerteorin. Denna teori förklarar hur partnersammansättningen bör se ut för att revisionsbolaget ska kunna prestera revisioner av hög revisionskvalitet.

    Viktiga ord: Revision, partnerskap, revisionskvalitet, revisionsbolagens ägarstruktur.

  • 54950.
    Öggesjö, Victor
    et al.
    Linnaeus University, Faculty of Social Sciences, Department of Sport Science.
    Nilsson, Sandra
    Linnaeus University, Faculty of Social Sciences, Department of Sport Science.
    Elever med diagnosen AD/HD i ämnet Idrott och hälsa: En kvalitativ studie av idrottslärares erfarenheter och strategier för elever med AD/HD2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrunden till arbetet bygger på våra tidigare erfarenheter från den verksamhetsförlagda utbildningen där vi upplever svårigheter med att undervisa elever utifrån deras behov och förutsättningar. Syftet med arbetet är att undersöka vilka erfarenheter lärare har av att undervisa elever med diagnosen AD/HD. Vi har även tagit del av idrottslärares strategier i förhållande till dessa elever. För att uppnå vårt syfte har vi valt att genomföra en kvalitativ undersökning som är baserad på semistrukturerade intervjuer av lärare i ämnet Idrott och hälsa. Resultatet visar att lärarna använder olika strategier för elever med AD/HD. Vidare upplever lärarna att det krävs mer utbildning om diagnosen på universiteten.

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