| 51. |
- Johannesson, Björn, et al.
(författare)
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Multi-species ionic diffusion in concrete with account to interaction between ions in the pore solution and the cement hydrates
- 2007
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Ingår i: Materials and Structures. - : Springer Science and Business Media LLC. - 1359-5997 .- 1871-6873. ; 40:7, s. 651-665
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Tidskriftsartikel (refereegranskat)abstract
- The penetration and leaching of ionic species in concrete are studied by using a model based on the Nernst-Planck equations. A finite element procedure is used to solve the coupled non-linear governing equations. A numerical example is performed in which the results are compared to measured electron probe micro analysis (EPMA) data. A close agreement of the simulated results to measured data is found for the specific studied example. The model includes the ionic species Cl-, Na+, OH-, Ca2+, K+ and SO42- and solid phases with variable composition. From the EPMA measurements the total concentration profiles of Cl-, CaO, SiO2, Na2O and SO3 are evaluated on samples exposed to a 3 wt% sodium chloride solution for 1 year. The main task in this investigation is to quantitatively understand the underlying mechanisms and find an accurate model that gives good correlation with the experimental results concerning the multi-species action during chloride penetration. In the model the chemical interaction between ions in solids and in pore solution is assumed governed by simple ion exchange processes only. The drawback using this approach is that the chemical part is lacking important physical relevance in terms of standard solubility thermodynamics. On the other hand the presented model is capable of accurately simulate the well documented peak behavior of the chloride profiles and the measured high content of calcium ions in pore solution under conditions when also chlorides is present. In this sense the established multi-species models for concrete based on standard solubility calculations alone is still incomplete.
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| 52. |
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| 53. |
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| 54. |
- Johansson, Håkan, et al.
(författare)
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What do we mean by active citizenship
- 2007
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Ingår i: Citizenship in Nordic welfare states: Dynamics of choice, duties and participation in a changing Europe. - : Routledge: London. - 9780415414890 ; , s. 32-51
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Bokkapitel (refereegranskat)
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| 55. |
- Jones, Steven, et al.
(författare)
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Googling for opposites: a web-based study of antonym canonicity
- 2007
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Ingår i: Corpora. - 1755-1676. ; 2:2, s. 129-154
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Tidskriftsartikel (refereegranskat)abstract
- This paper seeks to explain why some semantically-opposed word pairs are more likely to be seen as canonical antonyms (for example, cold/hot) than others (icy/scorching, cold/fiery, freezing/hot, etc.). Specifically, it builds on research which has demonstrated that, in discourse, antonyms are inclined to favour certain frames, such as ‘X and Y alike’, ‘from X to Y’ and ‘either X or Y’ (Justeson and Katz, 1991; etc.), and to serve a limited range of discourse functions (Jones, 2002). Our premise is that the more canonical an antonym pair is, the greater the fidelity with which it will occupy such frames. Since an extremely large corpus is needed to identify meaningful patterns of co-occurrence, we turn to Internet data for this research. As well as enabling the notion of antonym canonicity to be revisited from a more empirical perspective, this approach also allows us to evaluate the appropriateness (and assess the risks) of using the World Wide Web as a corpus for studies into certain types of low-frequency textual phenomena.
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| 56. |
- Jonnergård, Karin, et al.
(författare)
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Development Codes of Cunduct: : Regulatory conversations as means for Detecting Institutional Change
- 2007
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Ingår i: Law & Policy. - : Blackwell. - 0265-8240 .- 1467-9930. ; 29:4, s. 460-492
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Tidskriftsartikel (refereegranskat)abstract
- The introduction of a new corporate governance code in Sweden, modeled after prevailing Anglo-Saxon norms of corporate governance, offers the opportunity to investigate global regulatory convergence. Using the metaphor of regulatory space, this article analyzes the positions of the parties who submitted formal responses to the introduction of "The Swedish Code of Corporate Governance-A Proposal from the Code Group." While the globalization of financial markets might forecast unconditional acceptance of the proposed code by business and financial interests, the analysis of who made comments, and what was said, reveals three categorically distinct groups: Swedish business "insiders" connected to the existing institutional framework who opposed changes that would erode traditional division of functions, including collective responsibility for the actions of company boards; "outsiders" (i.e., foreign investors and more marginal Swedish investors) aligned with Anglo-Saxon internationalization of the markets who would change the system of corporate accountability; and the professions (i.e., auditors), who advocated for their professional interests. Of the three groups, Swedish business insiders were most successful in gaining support for their positions. Although international financial and political interests were key to the introduction of the Code in the first place, the article demonstrates how the dynamics of national (local) culture and power structures influence the transfer of regulatory law across jurisdictions.
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| 57. |
- Kirm, Ilham, et al.
(författare)
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Shift catalysts in biomass generated synthesis gas
- 2007
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Ingår i: Topics in catalysis. - : Springer verlag. - 1022-5528 .- 1572-9028. ; 45:1-4, s. 31-37
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Tidskriftsartikel (refereegranskat)abstract
- One of the CHRISGAS project objectives is to study the shift catalysts in biomass-generated synthesis gas. The water gas shift reaction is ruled by equilibrium, and the state of the gas can for a given H2/CO ratio be shifted by addition/removal of water, CO2 and/or by a change in the temperature. Stability area in respect to gas composition, sulphur content, pressure and temperature for FeCr shift catalyst has been investigated by thermodynamic equilibrium calculations. The calculations show that carbide formation is favourable in the “Normal water” case without sulphur in the gas. If sulphur is present in the gas, the situation improves due to sulphide formation.
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| 58. |
- Krigsman, Kristin, et al.
(författare)
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Refill non-adherence to repeat prescriptions leads to treatment gaps or to high extra costs.
- 2007
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Ingår i: Pharmacy World & Science. - : Springer Netherlands. - 0928-1231 .- 1573-739X. ; 29:1, s. 19-24
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To determine the nature and extent of undersupply and the economic consequences of oversupply of medication among non-adherent patients. METHODS: This study used copies of repeat prescriptions (= multiple dispensations), collected during 1 week in 2002 at 16 Swedish community pharmacies. For patients with a refill adherence below 80%, treatment gaps were defined as the number of days they had no drug available. The cost of drug oversupply (i.e., refill adherence > 120%) was calculated from the prices of the drug packages dispensed. RESULTS: The number of collected repeat prescriptions was 3,636. The median of treatment gaps among patients with a refill adherence below 80% was 53 days per 90-100 days treatment period and the corresponding median for oversupply was 40 days. The cost of oversupply for exempt patients (i.e., patients who have paid 1,800 SEK (Euro 196; US$ 243) per year for medicines) was 32,000 SEK (Euro 3,500; US$ 4,300) higher than for non-exempt patients. An extrapolation to all Sweden indicates that exemption from charges leads to an additional oversupply of about 142 million SEK (Euro 15 million; US$ 19 million) per year above that of non-exempt patients. CONCLUSION: Both undersupply and oversupply of prescribed medicines are common in Sweden. Patients with a refill adherence below 80% seem to have less than half of the prescribed treatment available. Oversupply or drug stockpiling occurs more frequently among exempt than among non-exempt patients, and this oversupply leads to high unnecessary costs.
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| 59. |
- Larsson, Ann-Charlotte, et al.
(författare)
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Deactivation of SCR Catalysts by Exposure to Aerosol Particles of Potassium and Zinc Salts
- 2007
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Ingår i: Aerosol Science and Technology. - : Informa UK Limited. - 0278-6826 .- 1521-7388. ; 41:4, s. 369-379
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Tidskriftsartikel (refereegranskat)abstract
- Generated aerosol particle deposition has been applied in laboratory scale to induce deactivation of commercial Selective Catalytic Reduction (SCR) catalysts Of V2O5-WO3/TiO2 monolithic type. The monolithic catalyst has been exposed to the generated submicrometer particle of inorganic salts, KCl, K2SO4, and ZnCl2 at 200 degrees C in a tubular reactor. The generated particles have been deposited on the catalytic surfaces by utilization of an electrostatic field. Physical characterization of the generated aerosol particles were conducted by Scanning Mobility Particle Sizer (SMPS) and Electric Low Pressure Impactor (ELPI) with and without catalyst in order to investigate the magnitude of the particle deposition. Particle charge distribution was also evaluated with a Tandem Differential Mobility Analyser (TDMA) set up.SCR is the most common method to commercially reduce NOx emissions from combustion processes. Catalyst lifetime is important for process economics and extending catalyst life can allow future strengthened emission legislation and diminished NOx emissions.Verification of particle deposition has been conducted through comparison with catalyst samples exposed to commercial biomass combustion condition.The reactivity of both fresh and exposed catalyst samples as well as commercially used samples was examined in SCR reaction and the methods of deposition as well as the influence of the different salts on catalytic performance have been explored.Catalyst samples have been evaluated with Scanning Electron Microscopy (SEM) with respect to surface morphology of the catalyst material. The laboratory deactivated catalyst samples showed resemblance with the commercially exposed catalyst sample with respect to salts concentration and deposition of the salts particles. The obtained influence on catalyst activity was comparable with commercially obtained catalyst activity reductions at comparable potassium concentration levels.
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| 60. |
- Larsson, Ann-Charlotte, et al.
(författare)
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Physical and chemical characterisation of potassium deactivation of a SCR catalyst for biomass combustion
- 2007
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Ingår i: Topics in catalysis. - : Springer Science and Business Media LLC. - 1022-5528 .- 1572-9028. ; 45:1-4, s. 149-152
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Tidskriftsartikel (refereegranskat)abstract
- The deactivation of a commercial Selective Catalytic Reduction (SCR) catalyst, of V2O5-WO3/TiO2 type, has been studied through comparisons with results from a full-scale biomass combustion plant to that with laboratory experiments. In the latter, the catalyst was exposed to KCl and K2SO4 by both wet impregnation with diluted salt solutions and deposition of generated submicrometer aerosol particles by means of an electrostatic field. The reactivity of fresh and deactivated samples was examined in the SCR reaction. Chemical and physical characterizations were focusing on internal structures and chemical composition. Deposition of submicrometer sized particles on the monolithic SCR catalyst was shown to induce deactivation with characteristics resembling those obtained in a commercial biomass combustion plant.
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