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- Dychawy Rosner, Irena
(author)
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Preventive interventions in socio-pedagogical social work
- 2017
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In: Papers of Social Pedagogy. - : University of Warsaw, Institute of Social Prevension and Resocialisation. - 2392-3083. ; 6:1, s. 24-35
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Journal article (peer-reviewed)abstract
- Artikel behandlar socialpedagogiska angreppssätt för preventiva sociala insatser inom socialt arbete
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| 3. |
- Javelle, Arnaud, et al.
(author)
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Ammonium and methylamine transport by the ectomycorrhizal fungus Paxillus involutus and ectomycorrhizas
- 1999
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In: FEMS Microbiology Ecology. - : Oxford University Press (OUP). - 1574-6941 .- 0168-6496. ; 30:4, s. 355-366
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Journal article (peer-reviewed)abstract
- Using [C-14]methylamine as an analogue of ammonium, the kinetics and the energetics of NH: transport were studied in the ectomycorrhizal fungus, Paxillus involutus (Batsch) Fr. The apparent half-saturation constant (K-m) and the maximum uptake rate (V-max) for the carrier-mediated transport derived from the Eadie-Hofstee transformation were 180 mu M and 380 nmol (mg dry wt)(-1) min(-1,) respectively. Both pH dependence and inhibition by protonophores indicate that methylamine transport in P. involutus was dependent on the electrochemical H+ gradient. Both long-term and short-term uptake experiments were consistent with regulation of ammonium/methylamine transport processes by the presence of an organic nitrogen source. Analysis of methylamine uptake by different P. involutus isolates revealed no obvious trend in the uptake capacities in relation to N deposition at the collection site. Kinetic parameters were determined in P. involutus/Betula pendula (Roth.) axenic association and in detached mycorrhizal roots isolated from forest sites. Enhanced methylamine uptake in the presence of the fungal symbiont was demonstrated. Homogeneous V-max values were found for axenic and detached mycorrhizas, whereas K-m values showed greater variations. (C) 1999 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
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| 4. |
- Jekabsons, Normunds
(author)
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Mechanics of composites with fiber bundle meso-structure
- 2002
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Doctoral thesis (other academic/artistic)abstract
- The presented thesis analyze mechanical phenomena in fibrous composites with fiber bundle sub-structure (woven composite sheet molding compounds (SMC) etc.). This sub-structure defines an intermediate meso-scale between the scale of individual fibers and macro-scale of the composite. The thesis consists of six papers dedicated to different mechanical aspects. Paper 1 contains an analysis of two analytical models for elastic properties of woven fabric composites. Predictions of these models are compared with results obtained using the method of reiterated homogenization and with experimental data for plain weave glass fiber- and carbon fiber polyester composites. Three different scales are identified in the analysis. It is shown that fiber bundle scale predictions are the most critical and the uncertainty there causes large differences in predictions. In Paper 2 the morphology of the ceramics C/PyC/SiC woven composite is studied and micro-damage mechanisms are revealed. Micromechanical fracture mechanics based models are proposed to describe the possible damage mechanisms. The significance of observed microdamage mechanisms for stiffness reduction is studied. The PyC core damage is suggested as the energy dissipation process. In contrast to most micromechanical models for stiffness prediction of woven composites, that assumes independence of the $Q$-matrix on the number of fabric layers in the composite, Paper 3 shows that it may not be true in some cases of woven composites. This paper contains experimental and theoretical investigations of plain weave carbon fiber/polyester composites with one single and eight layers of fabrics. The theoretical part of the paper consists of several micromechanical models which explain the main mechanisms. The last three papers: Paper 4 - Paper 6 are dedicated to the cohesive zone phenomenon which plays an important role in fracture of short fiber composites with fiber bundle structure. Paper 4 describes the finite element modeling (FEM) results of center-hole notched tensile specimens with different bridging-laws governing crack growth. Crack lengths, crack profiles and stress distributions are predicted. The results are compared with experimentally determined crack shapes from an earlier investigations. Only with softening bridging-laws, the experimental results can be matched. In Paper 5, fracture of SMC materials two double edge notched tensile (DENT) specimens with considerable difference in fracture characteristics is studied. Linear- and non-linear FEM were used to extract the true crack opening from measured displacements over the cracked region. The bridging laws of the two SMCs were estimated and the main physical mechanisms governing the fracture were recognized. Experimentally obtained load vs. displacement curves in compact tension tests (CT) of two different SMC materials are analyzed in Paper 6. Three different CT specimen geometries are considered. Progressive fracture is attained in all tests. By implementing bridging laws from Paper 5 and volumetric stiffness degradation of bulk SMC in an FEM model, the experimental results for two larger geometries were reproduced with high accuracy. Premature material degradation on the compressive side of the CT specimen precrack, was analyzed. The successful use of bridging laws strongly suggests that they are indiced intrinsic properties, governing the fracture behavior of SMC materials.
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| 5. |
- Michelsen, Verner
(author)
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A new European species of Pegomya Robineau-Desvoidy (Diptera : Anthomyiidae) near P-testacea (De Geer)
- 2006
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In: Zootaxa. - 1175-5334. ; :1260, s. 37-46
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Journal article (peer-reviewed)abstract
- A new species of Pegomya Robineau- Desvoidy, P. prisca sp. nov., is described from Europe ( Sweden, Czech Republic and Slovakia). It belongs to a species group together with the widespread West Palaearctic P. testacea ( De Geer) and P. hamata Wei described from China. Differential descriptions and illustrations of the terminalia are given for the two species of the Pegomya testacea species group found in Europe. Morphological and other evidence suggests that saprophagous larval habits persist in a few species of Pegomya represented by the P. testacea and P. ruficeps species groups.
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| 6. |
- Neogi, U, et al.
(author)
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Genetic analysis of HIV-1 Circulating Recombinant Form 02_AG, B and C subtype-specific envelope sequences from Northern India and their predicted co-receptor usage
- 2009
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In: AIDS research and therapy. - : Springer Science and Business Media LLC. - 1742-6405. ; 6, s. 28-
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Journal article (peer-reviewed)abstract
- HIV-1 epidemic in India is largely driven by subtype C but other subtypes or recombinants have also been reported from several states of India. This is mainly due to the co-circulation of other genetic subtypes that potentially can recombine to generate recombinant/mosaic genomes. In this study, we report detail genetic characterization of HIV-1 envelope sequences from North India (Delhi and neighboring regions). Six of 13 were related to subtype C, one B and the rest six showed relatedness with CRF02_AG strain. The subtype C possessed the highly conserved GPGQ motif but subtype B possessed the GPGR motif in the V3 loop as observed earlier. While most of the sequences suggested CCR5 co-receptor usage, one subtype C sample clearly indicated CXCR4 usage. A successful mother to child transmission was established in two pairs. Thus, co-circulation of multiple subtypes (B and C) and the recombinant CRF02_AG strains in North India suggests a rapidly evolving scenario of HIV-1 epidemic in this region with impact on vaccine formulation. Since this is the first report of CRF02_AG envelope from India, it will be important to monitor the spread of this strain and its impact on HIV-1 transmission in India.
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| 7. |
- Qvarsebo, Jonas
(author)
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Fabricating and Governing the Swedish School Pupil : The Swedish Post-War School Reform and Changing Discourses of Discipline and Behaviour
- 2018
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In: Nordic Journal of Educational History. - Umeå : Nordic Journal of Educational History. - 2001-7766 .- 2001-9076. ; 5:2, s. 111-130
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Journal article (peer-reviewed)abstract
- This article examines the dominant discourses of behaviour and discipline in the debate on schooling and the conduct of school pupils in Swedish professional teacher journals between 1946 and 1962, the formative years of the Swedish comprehensive school. Drawing from the theoretical framework of discourse, governmentality and the fabrication of the subject developed by Michel Foucault, the fabrication and governing of the school pupil is highlighted and analysed. The findings of the study are related to historical research of the period as well as Foucauldian studies where a historical shift of perspectives on discipline and behaviour in the school have been proposed. The result is a detailed analysis of the fabrication and governing of the subject within the dominant discourses of behaviour and discipline during the period, as well as a critical nuancing of the idea of this historical shift.
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| 10. |
- Fischer-Hübner, Simone, et al.
(author)
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Privacy in Social Collective Intelligence Systems
- 2014. - 1
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In: Social Collective Intelligence. - Switzerland : Springer. - 9783319086804 ; , s. 105-124
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Book chapter (peer-reviewed)abstract
- The impact of Social Collective Intelligent Systems (SCIS) on the individual right of privacy is discussed in this chapter under the light of the relevant privacy principles of the European Data Protection Legal Framework and the Organization for Economic Co-operation and Development (OECD) Privacy Guidelines. This chapter analyzes the impact and limits of profiling, provenance and reputation on the right of privacy and review the legal privacy protection for profiles. From the technical perspective, we discuss opportunities and challenges for designing privacy-preserving systems for SCIS concerning collectives and decentralized systems. Furthermore, we present a selection of privacy-enhancing technologies that are relevant for SCIS: anonymous credentials, transparency-enhancing tools and the PrimeLife Policy Language. Finally, we discuss how these technologies can help to enforce the main legal principles of the European Data Protection Legal Framework, and argue how provenance and reputation can be designed in a privacy preserving manner.
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