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  • 45251.
    Lindström, Nevena
    Linnaeus University, Faculty of Arts and Humanities, Department of Media and Journalism.
    Ett omskrivet omslag: - En studie om varför ett Vogue omslag skapade stor uppmärksamhet och kritik i amerikansk webbpress2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 45252.
    Lindström, Niklas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Psychology.
    The Just One Look Method: The Act of Inward Looking and the Self-Directed Attention Exercise2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study was to examine personal experiences of an alternative method for improving mental health and well-being called The Just One Look Method (JOLM). Data were collected and analyzed by qualitative content analysis of eight semi-structured interviews of JOLM users resulting in three main themes: The Act of Inward Looking (AIL), The Self-Directed Attention Exercise (SDA) and Consequences of JOLM. The main results where that AIL may offer an additional aspect and definition of the concept of self, a kind of subjective sense of self with possible implications for the field of consciousness science. And that looking at that sense of self may influence attention with possible positive consequences for mental health and well-being. JOLM was contrasted theoretically with traditional attention-based methods for achieving better mental health with a particular emphasis on Buddhist meditation. Further research was suggested to investigate more causal relationships between AIL and SDA and between JOLM and mental health.   

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  • 45253.
    Lindström, Oscar
    et al.
    Linnaeus University, School of Business and Economics, Department of Marketing.
    Podolská, Zuzana
    Linnaeus University, School of Business and Economics, Department of Marketing.
    Employer branding: How can organizations attract highly-qualified employees2022Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Globalization and facilitated labor migration possibilities for highly-qualified employees have increased the issues of brain drain in many countries. The purpose of this research is, therefore, to identify how the employer branding strategies of organizations can be adapted in order to attract highly-qualified employees. The employer attractiveness perceived by people who left for work abroad is investigated alongside the current trends in employer branding strategies of organizations. Based on previous research, it is crucial to understand how organizations' employer branding relates to the perceptions of employees, rather than focusing on employer attractiveness in general. The study therefore covers the existing gap between the current employer branding efforts of organizations and the perceptions and expectations of potential employees. The research method was based on the interpretivist philosophy and thematic analysis of the qualitative data. By conducting seven qualitative semi-structured interviews per each data set of organizations and individuals who left the country for work abroad, this research covers perspectives from both sides of the issue. This study has, thus, identified several areas in employer branding strategies that can be adapted to the wants and needs of highly-qualified employees. Specifically, the employer value proposition and the attractiveness related values are studied. These refer to the economic, development, social, diversity and reputation value. Recruitment channels are also studied as an employer branding strategy. The results have identified how organizations can, practically and concretely, improve their employer branding strategies and thus also increase their attractiveness as an employer. These implications are not only relevant for companies and highly-qualified employees, but also for counteracting the severe consequences of brain drain.

  • 45254.
    Lindström, Oskar
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Magnusson, August
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Säkerhetsmedvetenhet och integration av IoT: En kvantitativ studie på konsumenters säkerhetsmedvetenhet och syn på integration av IoT2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet-connected devices are becoming more common to see in our homes. The collective word for these devices is Internet of Things (IoT). With the introduction of IoT in our homes, more access points to the internet are created, which also creates alarger attack area. Combined with the ever-growing cybercrime and the introduction of IoT in our homes, the risk of being attacked increases. Previous research in the field of consumer information security awareness shows that consumers have low awareness, and lack of knowledge about the threats posed by the integration of an IoT device in the home. Previous research has examined the factors that influence individuals attitudes towards adopting new technology. Much of the previous research in the field has focused on the technical aspects and the focus has not been on consumers information security awareness and their attitude to the increasing integration of IoT. This study aimed to examine Swedish consumers' information security awareness and their attitude towards the increasing integration of IoT. The study aimed to examine how aware consumers are of the information security risks that arise from the integration of IoT in the home in combination with examining their stand on the increased integration of IoT in their everyday life. The study has focused on two specific IoT-devices. These devices generate data via audio recording and video recording. A quantitative method with a survey was applied to examine how aware the consumers where of the information security risks, but also to be able to include more respondents in the study. To understand consumer behavior, the questionnaires were designed based on the generally applied behavioral model Theory of plannedbehavior (TPB).The study found that the majority of respondents had a low awareness of the risks involved with the integration of IoT devices, as well as low knowledge of the security measures that can be implemented. Despite the low awareness of the risks, it turnedout that the respondents had a very positive attitude towards the increased integrationof IoT, and that they also are considering acquiring more IoT devices.

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    Säkerhetsmedvetenhet och integration av IoT
  • 45255.
    Lindström, Per
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Approximation of maximum weld induced residual stress magnitude by the use of meyer hardness2016In: Maritime Transportation and Harvesting of Sea Resources / [ed] Soares C.G. & Teixeira A.P., CRC Press, 2016, Vol. 1, p. 625-632Conference paper (Refereed)
    Abstract [en]

    Weld joints play a very important role in assessment of structural integrity of steel structures. The weld joint region is the location of weld induced residual stress and strain fields (WRS). For the time being there is a lack of engineering methods to be used for approximations of the maximum WRS magnitudes in the way of a weld joint proposed to be produced with a specific Welding Procedure Specification (WPS). Or screening of residual stress measurement results obtained by various measuring methods. This report describes how one can proceed to establish best estimate material data by the use of the Meyer’s hardness. The Meyer’s hardness can also be used to determine the maximum physically possible WRS magnitude.

  • 45256. Lindström, Per
    Arctic Technology: Report of Committe V.62012In: Proceedings of the 18th International Ship and Offshore Structures Congress, Volume 2: Report of Committe V.6 - Arctic Technology / [ed] W. Fricke & R. Bronsart, Hamburg: Schiffbautechnische Gesellschaft , 2012, 1, p. 243-274Chapter in book (Other academic)
  • 45257.
    Lindström, Per
    DNV GL Materials Laboratory, Norway ; University West.
    DNV Platform of Computational Welding Mechanics2013Report (Other academic)
    Abstract [en]

    This document presents the DNV Platform of Computational Welding Mechanics, CWM, with its associated CWM-methodology. That has been developed, validated and implemented as a part of DNV’s Technology Leadership program in the field of Structural Integrity and Materials Technology.A successful CWM implementation requires that the actual organisation has gained the knowledge and understanding of the following related topics:- Welding Engineering with an emphasis on the welding process and its thermodynamics- Weld process quality control such as calibration, validation as well as DAQ, (Data Acquisition)- Transient thermo-mechanical coupled FE-analyses and constitutive modelling- Computational platforms comprising the selection of hardware, operative system and FEM-code as well as suitable pre- and post-processing toolsFrom that perspective there is a lack of reliable and/or hands-on oriented CWM Engineering Handbooks and best recommended practices available on the market. For that sake is the DNV CWM-methodology and its hands on solutions presented.The CWM-methodology described can not only be used for residual stress assessments, as presented in this report. It can also be used for various applications such as assessment of used and/or proposed WPS, Welding Procedure Specifications as well as optimisation of the manufacturing and production process of integrated metallic structures.From the results of a parametric CWM-study have three (3) factors been identified to drive and/or contribute to the magnitude of the weld residual stresses in ship steel plate materials. The contributing and/or driving factors identified are the:- Thermal- and Mechanical Boundary Conditions during the production welding- Yield stress difference between the base- and the weld filler material- Weld heat input, Q, which affects the weld cooling time

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  • 45258.
    Lindström, Per
    Chalmers University of Technology.
    Heat Transfer Prediction of In Service Welding in a Forced Flow of Fluid2005Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    An algorithm for heat transfer prediction of in-service welding operations in a forcedflow of fluid is presented. The algorithm presented is derived from Rosenthal’s 3D heatflow equation and boundary layer approximations. This was possible by the introductionof an apparent thermal conductivity kPL, which is a function of the boundary layer’s heattransfer coefficient f and the base material’s thickness . This implies that a weldcooling time ΔtT1 /T2 in a forced flow of fluid can now be calculated by an ordinaryengineering calculator and thus enabling suitable welding parameters to be determined.The magnitude of kPLf , was established by regression analysis of results from aparametric finite element analysis series of a total number of 112 numerical simulations.Furthermore, the result of the regression analysis was validated and verified by a weldingexperiment series accomplished on an in-house designed and constructed in-servicewelding rig. The principle design of the welding rig as well as its instrumentation, a PCbased Data Acquisition system, is described. In addition, a method to measure the weldmetals cooling time ΔtT1 /T2 by means of thermocouple elements is described. Finally,the algorithm presented in this study proved feasible for industrial in-service weldingoperations of fine-grained Carbon and Carbon–Manganese steels with a maximum Carbon Equivalent (IIW) (CE) of 0.32.

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  • 45259.
    Lindström, Per
    Chalmers University of Technology.
    Heat Transfer Prediction of In-Service Welding in a Forced Flow of Fluid2009In: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 131, no 3, p. 1-6, article id 031304Article in journal (Refereed)
    Abstract [en]

    An algorithm for heat transfer prediction of in-service welding operations in a forcedflow of fluid is presented. The algorithm presented is derived from Rosenthal’s 3D heatflow equation and boundary layer approximations. This was possible by the introductionof an apparent thermal conductivity kPL, which is a function of the boundary layer’s heattransfer coefficient f and the base material’s thickness . This implies that a weldcooling time tT1 /T2 in a forced flow of fluid can now be calculated by an ordinaryengineering calculator and thus enabling suitable welding parameters to be determined.The magnitude of kPLf , was established by regression analysis of results from aparametric finite element analysis series of a total number of 112 numerical simulations.Furthermore, the result of the regression analysis was validated and verified by a weldingexperiment series accomplished on an in-house designed and constructed in-servicewelding rig. The principle design of the welding rig as well as its instrumentation, a PCbased Data Acquisition system, is described. In addition, a method to measure the weldmetals cooling time tT1 /T2 by means of thermocouple elements is described. Finally,the algorithm presented in this study proved feasible for industrial in-service weldingoperations of fine-grained Carbon and Carbon–Manganese steels with a maximum CarbonEquivalent (IIW) (CE) of 0.32.

  • 45260.
    Lindström, Per
    Högskolan Väst.
    Improved CWM platform for modelling welding procedures and their effects on structural behaviour2015Doctoral thesis, monograph (Other academic)
    Abstract [en]

    A welding procedure specification is the document describing how a weld joint should be constructed. Arc weld processes are characterized by transient thermal behavior, leading to rapid changes in material properties and dynamic interaction between weld and base material. The objective of the project is to explore how the use of an improved CWM-platform affects representative stress and strain fields in order to assess welding procedure qualification records. Forthis project, the accumulated thermal and mechanical influences from the first run to the final run are brought forward, in one and the same meshed geometrical model. Both the thermal and mechanical material model of the platform are designed to be used for modelling of the base- and weld material,promoting the simulation of the intricate combination of the thermal, elastic,and plastic strains on the plastic strain hardening and the formation of residual stress fields. The output of the simulation is mainly weld cooling times, residual stresses, and deformations. This analysis is taken further by examining how residual stresses influence crack driving force under elastic and plastic loading. In addition, the output from the simulations can be used to assess the realism of the proposed welding parameters. The main experimental welding procedure examined comes from the IIW RSDP Round Robin Phase II benchmark project, where the main aim was to benchmark residual stress simulations. This work was found to contain many applicable challenges of a CWM-analysis project.

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    FULLTEXT02
  • 45261. Lindström, Per
    et al.
    Caprace, J.-D
    Mishra, B.
    Pires, F.
    Roland, F.
    Schipperen, I.
    Andric, J.
    Li, L
    Osawa, N
    Doig, R.
    Remes, H.
    Kim, M. H.
    Materials and Fabrication Technology: Committee v.32015In: Proceedings of the 19th International Ship and Offshore Structures Congress, Volume 2: Committee v.3 Materials and Fabrication Technology / [ed] Carlos Guedes Soares & Yordan Garbatov, EH Leiden, Nederlands: CRC Press, 2015, 1, Vol. 2, p. 619-698, article id V.3Chapter in book (Other academic)
    Abstract [en]

    Due to the past crises, the shipbuilding and offshore industry has realised that new innovative designs and design and production methods are necessary to decrease operational costs, production costs and emissions,while meeting the changing rules and regulations. This ISSC-V.3 report is discussing recent developmentin materials and fabrication technology applied to ship and offshore structures.Chapter 2 focuses on worldwide trends in materials and fabrication methods. Developments in metallicand non-metallic structural materials are dealt in Chapter 3. Advances in fabrication and joining technologiessuch as welding are increasing. Some main areas of applications and research in those areas aredescribed in Chapter 4. Innovative development about corrosion protection systems are presented inChapter 5 while Chapter 6 give an overview about the application of production simulation and virtualreality to improve the production management of ship and offshore structures.The ISSC-V.3 technical committee has performed a benchmark to define a Best Practice Guideline touse Computational Welding Mechanics tools (CWM) in shipbuilding and offshore industry. To achievethis objective various experimental welding tests have been performed in order to give a reference point.Both the residual welding distortions and residual stresses have been compared between numerical simulationsand welding experiments for a common “T” welded assembly used in the shipbuilding industry.However, it has been decided to publish the results of this study in a separate document. Nevertheless, Chapter 7 of this report presents the state of the art as well as the experimental test case that has been analysed.

  • 45262.
    Lindström, Per
    et al.
    DNV Materials Laboratory, Norway ; University West.
    de Blanche, Andreas
    University West.
    Integration and Optimization of a 64-core HPC for FEM- and/or CFD Welding Simulations2013In: NAFEMS NORDIC Seminar: Improving SimulationPrediction by Using Advanced Material Models / [ed] Roger Oswald, München: NAFEMS Deutschland, Österreich, Schweiz - DACH , 2013Conference paper (Other academic)
  • 45263.
    Lindström, Per
    et al.
    Chalmers University of Technology.
    Faraji, Maneli
    Chalmers University of Technology.
    Review and Selection of a Finite Element Simulation Platform For Academic and Industrial Analyses of In-Service Welding Operations2004In: Proceedings of OMAE’04 23rd International Conference on Offshore Mechanics and Arctic Engineering, June 20-25, 2004, Vancouver, British Columbia, Canada, ASME Press, 2004, Vol. 2, p. 801-806, article id 51246Conference paper (Refereed)
    Abstract [en]

    In order find a general platform/environment forsimulation of in-service welding operations, a review andanalysis of non-linear Finite Element Analysis, FEA, programshave been performed. Free and commercial softwares havebeen considered and the programs that have been reviewed andevaluated are ABAQUS, CALCULIX, CODE-ASTER, MARCand SYSWELD. Different platforms, i.e. workstation configurationswith the associated Operative System, OS, has alsobeen investigated to find an optimised simulation platformsolution. To facilitate the selection of a suitable simulationplatform, the performance and durability of ABAQUS has beenevaluated by means of an in-service weld simulation.The residual weld hoop stresses of the weld simulationhave been compared with the results of girth weld experimentsfrom bibliographic sources. To enhance the evaluation processas well as gain experiences of measuring residual weld stresses,two (2) girth welds with measurement of the weld hoop stresseshave been carried out. The maximum solving performance ofABAQUS was obtained by means of a tailor-made workstation,configured with the OS Slackware Linux 9.1 and a speciallycompiled Linux kernel.The findings of the research will be utilized on selection ofa FEA-simulation platform that will be used for the purpose ofscientific research and industrial development in the field of inservicewelding operations.

  • 45264.
    Lindström, Per
    et al.
    University West ; DNV GL Materials Laboratory, Norway.
    Jonsson, Anders
    DYNAmore Nordic AB .
    Jernberg, Anders
    DYNAmore Nordic AB .
    Östby, Erling
    DNV GL Materials Laboratory, Norway.
    Non-linear fracture mechanics in LS-DYNA and LS-PrePost2015In: European LS-DYNA Conference 2015: Conference Papers, Würzburg: DYNAmore GmbH , 2015Conference paper (Other academic)
    Abstract [en]

    Fracture mechanics provides an engineering framework for assessing the consequences of defects instructures. In linear elastic fracture mechanics (LEFM), stress intensity factors KI, KII and KIII are usedfor characterizing the stress singularity at the crack tip, which arises from the theory of linear elasticity.Crack growth is assumed to occur when KI exceeds the fracture toughness KC. LEFM can be usefulfor brittle materials, or when the size of the plastic zone is small compared to global dimensions. In non-linear fracture mechanics (EPFM), an energy based criterion is used for assessing the risk forcrack growth: if the energy release rate at the crack tip exceeds what is required for creating newsurfaces in the material, crack growth will occur. Under certain assumptions the energy release rate atthe crack tip can be calculated by a path independent integral, the so-called J-integral. In modernFE-based fracture mechanics applied to practical design, the structure under consideration ismodelled, including cracks at specific locations, and the J-integral values are computed and used asdesign criteria. From a numerics viewpoint, the J-integral has many appealing properties: it can beevaluated from the far-field solution, which reduces numerical errors that may arise close to the cracktip, and the expected path-independence can to some extent be used as a quick check on solutionvalidity.Evaluation of the J-integral from LS-DYNA simulation results has been implemented as a postprocessingtool in LS-PrePost, including consistent treatment of residual stresses. The implementationcovers both 2D (plane stress / plane strain) and 3D applications, using the virtual crack-tip extension(VCE) method. The tool is accessible both via the LS-PrePost GUI and via command file interface.

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  • 45265.
    Lindström, Per
    et al.
    DNV Materials Laboratory ; Chalmers University of Technology.
    Josefson, Lennart
    Chalmers University of Technology.
    2D, Axisymmetric and 3D Finite Element Analysis Assessment of the IIW RSDP Round Robin Initiative, Phase 1 and Phase 22012Report (Other academic)
    Abstract [en]

    A further assessment of the IIW numerical and experimental test RSDP Round Robin Initiative, Phase 1 and Phase 2 is presented. Focus is on the weld process specification, and the importance ofuse of as realistic as possible weld process parameters in the weld simulations. Considerable interpretation is often required of the weld designer and of the FE modeller when simulatinga weld process. The paper demonstrates, on the IIW RSDP round Robin benchmarks, that with interpretation and judgement, Computational Welding Mechanics using a variety of models and approaches is possible. Difficulties in interpretation could be substantially reduced through the use of industrial methods of specification, weld process specifications (WPS). For this reason, the authors recommend that all benchmarks follow the standards and definitions used in internationally recognised industrial standards. For the Phase 1 benchmark three-pass butt welded pipe case, which was a designed case for weld simulations, rotationally symmetric and fully 3D results are presented for temperatures, deformations and stresses. These results are compared with IIW benchmark results, and differences caused by weld process parameters and material modelling (for the mechanical analysis) are discussed.For the Phase 2 benchmark two pass butt welded coupon plate case, experimental results are available. The incomplete documentation from the weld experiment compared to realistic WPS is discussed. 3D thermal results coupled with generalised plane strain 2D results for temperatures, deformations and stresses using correct WPS and realistic material data are presented and compared with IIW benchmark results. SFor both Benchmarks the LS-Dyna FE software was used, with a major modification being a modified Goldak heat source model.

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    IIW-2012_X-1712-12
  • 45266. Lindström, Per
    et al.
    Josefson, Lennart
    Schill, Mikael
    Borrvall, Mikael
    Constitutive Modelling and Finite Element Simulation of Multi Pass Girth Welds2012In: NAFEMS NORDIC Conference: Engineering Simulation: Best Practices, New Developments, Future Trends / [ed] Roger Oswald, München, Germany: NAFEMS Deutschland, Österreich, Schweiz - DACH , 2012Conference paper (Other academic)
  • 45267.
    Lindström, Per
    et al.
    Chalmers University of Technology.
    Ulfvarson, Anders
    Chalmers University of Technology.
    An Experimental Rig For Verification of The Mechanical Properties of Welds Produced at In-Service Welding2003In: Proceedings of OMAE’03 22nd International Conference on Offshore Mechanics and Arctic Engineering, June 8 – 13, 2003, Cancun, Mexico, ASME Press, 2003, Vol. 3, p. 57-65, article id 37105Conference paper (Refereed)
    Abstract [en]

    The strength of a weld joint is determined by its geometry and its metallurgic structure, which is dependent on the cooling rate, its chemical composition and the original grain size of the base material. During in-service welding of structures affected by a forced flow of fluid on its reversed side the cooling rate depends on the fluid’s boundary layer, the material’s thickness and the heat input of the welding process. Currently, the calculation of the cooling rate during in-service welding is made by means of numerical methods such as the Finite Element Method, FEM. Through the introduction of an apparent thermal conductivity, kPL, it possible to determine the cooling rate for specific welding parameters by means of Rosenthal’s equation. This can be done with a standard pocket calculator.An experimental rig for measurement of the heat transfer during the in-service welding of structures affected by a forced flow of fluid on its reversed side has been designed and built. The physical principles of welding on plates affected by a forced flow of fluid on their reverse side are the same as for welding on the circumference of a pipe containing a forced flow of fluid. In the rig, the required boundary layer is built up in a pipe system by means of a pump. As the flow and the temperature of the fluid can be controlled to simulate the specific heat transfer, it is now possible to verify the values of the apparent thermal conductivity, kPL, that were calculated

    values of the apparent thermal conductivity, kPL, for various configurations.For the purpose of evaluation and qualification of in-service Welding Procedures Specifications, WPS, the sponsors of the research project use the experimental rig.

  • 45268.
    Lindström, Per
    et al.
    Chalmers University of Technology.
    Ulfvarson, Anders
    Chalmers University of Technology.
    Weld Repair of Shell Plates During Seagoing Operations2002In: Proceedings of OMAE’02; 21st International Conference on Offshore Mechanics and Artic Engineering: June 23-28, 2002, Oslo, Norway, ASME Press, 2002, Vol. 3, p. 499-506Conference paper (Refereed)
    Abstract [en]

    An algorithm to estimate the cooling rate of welding seamson the shell plating of a ship, below the waterline, while it is onvoyage has been derived. The demand for this technique hasarisen from the wish of ship operators to make it possible forthe safe repair of ship structures without taking them out ofoperation. [1] The strength of the shell plating after welding isdetermined by its metallurgic structure, which is dependent onthe cooling rate, its chemical composition and the original grainsize of the base material. [2] The cooling rate for this type ofwelding seam depends on the velocity of the water flow, thedistance from the bow, the thickness of the plate, and the heatfrom the heat input of the welding. The algorithm makes itpossible to calculate the cooling rate for a base material affectedby a forced flow of fluid by means of Rosenthal’s equation andthus enabling suitable welding parameters to be determined.As the welding parameters can be chosen to fit the specificrepair to be made, it is now possible to determine the suitabilityof a welding procedure in advance. The algorithm is applicablewhen determining welding parameters at Hot-Tappingoperations as well, where the base material is affected by aforced flow of fluid. A number of experiments have beenperformed and the results support the theoretical model. Theresearch project continues with the aim of finding an algorithmto include the enhanced cooling rate due to the layer of boilingfluid on the back of the base material. A method to improve themeasurements of the most important parameter in the algorithmhas been developed and makes it possible to build up aquantitative database of typical values for various configurations.

  • 45269.
    Lindström, Per
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Østby, E.
    A DNV GL Materials Laboratory, Norway.
    Nonlinear fea of weld residual stress influence on the crack driving force2016In: Maritime Transportation and Harvesting of Sea Resources / [ed] Soares C.G. & Teixeira A.P., CRC Press, 2016, Vol. 1, p. 633-644Conference paper (Refereed)
    Abstract [en]

    Weld joints play a very important role in the assessment of structural integrity of steel structures. The likelihood of defects is significantly higher in the weld joint compared to the unaffected base material. Here the Computational Welding Mechanics platform developed by Lindström (2015) has been used to model representative residual stress fields by the use of the IIW RSDP Phase II Initiative documentation (Janosch 2001). Where the CWM-platform includes an option for tracking the welding’s influences on the evolution of the base and weld material’s tensile properties. A detectable defect is introduced in the weld metal and the crack driving force in terms of the CTOD is extracted from the FEA. The loading applied covers both globally elastic and fully plastic conditions. The analysis allows evaluation of the influence of both residual stresses and changes in the tensile properties on the crack driving force as a function of applied global load.

  • 45270. Lindström, Peter
    Family Interaction, Neighborhood Context and Deviant Behavior: A Research Note1996In: Studies on Crime and Crime Prevention, ISSN 1102-3937, Vol. 5, no 1, p. 113-119Article in journal (Refereed)
    Abstract [en]

    Under the two different hypotheses, the social context may impact juvenile delinquency either through a spreading effect, that is, increasing the risk of delinquency among all youths in socially unstable neighborhoods, or through a multiplicative effect that implies only certain youths will be affected in socially unstable contexts. The purpose of the study was to analyze the relationship between family interaction and self- reported delinquency among students in schools in socially stable and unstable neighborhoods, respectively. Data were taken from the Stockholm Project's School Survey, which involved approximately 340 boys in seven junior high schools. A tentative conclusion is that both a spreading effect and a multiplicative effect concerning students' delinquency were discernible; however, a somewhat stronger support is found for the multiplicative hypothesis. Under the multiplicative hypothesis, certain students in unstable contexts should have a higher probability of deviant behavior; the data show that students with weak family interaction have a much higher probability of deviant behavior in the unstable areas than similar students in schools in the more stable areas.

  • 45271.
    Lindström, Peter
    Polismyndigheten Stockholms län.
    Fler poliser - färre brott?2011Report (Other academic)
    Abstract [en]

    The size of a country’s police force is of great public and political concern. In the 2006 national election campaign the opposition coalition promised that if they would be elected the number of police officers in Sweden would increase from about 17 500 to 20 000 by the year 2010. The coalition was elected and the political goal was achieved. The main question in this report is: What impact will such an increase of the number of police officers have on the crime rate?

    In this report previous research, mainly from the United States, is reviewed and thoroughly analyses of the relationship between police strength and domestic burglary, robbery, homicide and car related offences in Sweden are made. The data consists of a random sample of 145 municipalities studied between the years 2001 and 2008. A complementary data set consists of all 21 police forces in Sweden between 1995 and 2009. Through panel data analysis it is concluded that an increase of the local police by 10 percent would possibly reduce domestic burglary by 3 to 4 percent. No impact is found on robbery, car theft or homicide, however. More police officers also means that more drug offences are being registered and more crimes in general being cleared-up.

    The allocation of police officers is also briefly investigated in this study. About 30 percent of all police officers in Sweden are allocated to Stockholm County. This proportion has been fairly stable over the last 15 years. However, the population in this metropolitan area has increase by 20 percent since 1995, compared to about 3 percent in the rest of the country. One consequence is that the surplus of police officers per capita in Stockholm in relation to the number of officers per capita in the rest of the country has decreased substantially. 

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  • 45272.
    Lindström, Peter
    Swedish National Police College.
    Fler åtalade unga lagöverträdare1998In: Nordisk Tidsskrift for Kriminalvidenskab, ISSN 0029-1528, Vol. 85, no 2, p. 141-158Article in journal (Refereed)
  • 45273.
    Lindström, Peter
    Swedish National Police College.
    Fångtal och brott: hur ser sambandet ut?2008In: Nordisk Tidsskrift for Kriminalvidenskab, ISSN 0029-1528, Vol. 95, no 2, p. 151-172Article in journal (Refereed)
  • 45274.
    Lindström, Peter
    Police Region Stockholm, Sweden;Malmö University, Sweden.
    Kunskapsbaserat polisarbete: forskning och professionalisering2018In: Kriminologi och poliskunskap: mötet mellan forskning och praktik / [ed] Peter Lindström & Ulf Sempert, Lund: Studentlitteratur AB, 2018, 1, p. 19-50Chapter in book (Other academic)
  • 45275. Lindström, Peter
    More Police – Less Crime? The relationship between police levels and residential burglary in Sweden2013In: The Police Journal, ISSN 0032-258X, E-ISSN 1740-5599, Vol. 86, no 4, p. 321-339Article in journal (Refereed)
  • 45276.
    Lindström, Peter
    Swedish National Police College.
    Närpolisen och skolan: ett brottsförebyggande team?1996Report (Other academic)
  • 45277.
    Lindström, Peter
    Swedish National Police College.
    Patterns of School Crime: A Replication and Empirical Extension1997In: British Journal of Criminology, ISSN 0007-0955, E-ISSN 1464-3529, Vol. 37, no 1, p. 121-130Article in journal (Refereed)
    Abstract [en]

    Crimes committed at schools, such as burglary, theft, vandalism and violence, have generally not been an issue that has occupied Swedish criminologists. However, according to the official statistics in 1975 about 5,800 burglaries in educational premises (including schools, day-care centres and libraries) were reported to the police. In 1994 over 11J500 burglaries were reported—an increase of almost 100 per cent. As a comparison, domestic burglary decreased during the same period by 12 per cent. Theft without breaking and entering in educational settings also increased substantially between 1975 and 1994 (from 5,700 to nearly 10J300), or by 80per cent, whereas theft from other workplaces increased by 40 per cent on average. On the whole, this indicates that a thorough investigation of school crime seems to be needed in Sweden.

  • 45278.
    Lindström, Peter
    Malmö University, Sweden;Stockholm County Police, Sweden.
    Police and crime in rural and small Swedish municipalities2015In: Journal of Rural Studies, ISSN 0743-0167, E-ISSN 1873-1392, Vol. 39, no June, p. 271-277Article in journal (Refereed)
    Abstract [en]

    The allocation of police officers in a country is generally a matter of great public concern. Between 2006 and 2010 police manpower in Sweden increased by about 15 percent, just as the coalition government had promised. However, in various documents the government has been clear about the need of police presence all over the country and a network organization consisting of rural and small municipalities have had as one of their main goal to ensure that there are permanent police personnel in all municipalities. In this article the allocation of police resources as well as police-recorded domestic burglary in rural and other municipalities are being analysed. The overall conclusion is that rural areas have not gained any increase in police numbers since 2006. Crime in general is lower in these communities but in relative terms increases over time have been as large or even larger in rural and small municipalities compared to other municipalities. In 2015 Sweden will see a new form of national police organization. To what extent this political reform will ensure police presence in rural and small communities is still a key question.

  • 45279.
    Lindström, Peter
    Swedish National Police College.
    Polisiär nolltolerans: flipp eller flopp?2006In: Nordisk Tidsskrift for Kriminalvidenskab, ISSN 0029-1528, Vol. 93, no 1, p. 15-36Article in journal (Refereed)
  • 45280.
    Lindström, Peter
    Stockholm University, Sweden.
    School and Delinquency in a Contextual Perspective1993Doctoral thesis, monograph (Other academic)
  • 45281. Lindström, Peter
    School Context and Delinquency. The Impact of Social Class Structure and Academic Balance1995Report (Other academic)
  • 45282.
    Lindström, Peter
    National Council for Crime Prevention, Sweden.
    School Violence: A Multi-Level Perspective2001In: International Review of Victimology, ISSN 0269-7580, E-ISSN 2047-9433, Vol. 8, no 2, p. 141-158Article in journal (Refereed)
    Abstract [en]

    School violence has been a recurring theme in the Swedish media over the last decade. Unfortunately research on this subject has been scarce and the media picture has therefore often been accepted uncritically. This article presents an overview of what is known about school violence in Sweden. Using a contextual approach it is also investigated to what extent individual level characteristics and features of the school context account for the risk of victimization. On the whole it is found that in schools where social capital, e.g. family and community resources, is low, violence tends to be higher, especially among students with low self-esteem and weak school involvement.

  • 45283.
    Lindström, Peter
    Swedish National Police College.
    Tredje resan – vart bär det hän?: Utvärderingsresultat och implikationer av den amerikanska lagen ”Three-Strikes and You’re Out2007In: Nordisk Tidsskrift for Kriminalvidenskab, ISSN 0029-1528, Vol. 94, no 1, p. 40-55Article in journal (Refereed)
  • 45284.
    Lindström, Peter
    Växjö University, Police officer programme.
    Violence against women in Scandinavia: A description and evaluation of two new laws aiming to protect women2005In: Journal of Scandinavian Studies in Criminology and Crime Prevention, ISSN 1404-3858, E-ISSN 1651-2340, Vol. 5, no 2, p. 220-235Article in journal (Refereed)
    Abstract [en]

    Violence against women by a present or former male partner has over the last decade been given a higher priority in the political discussion in all of the Scandinavian countries. Increasingly, violence in intimate relationships is viewed as a public rather than a private matter in these countries. With this change in attitudes and levels of political interest, higher expectations are placed on official authorities, including the criminal justice system, to deal actively with this social problem. In all of the Scandinavian countries it may, for example, be decided by a prosecutor that a woman should be protected from a man by issuing a restraining order. Moreover, a new offence called ‘gross violation of a woman's integrity’ was introduced into the Swedish penal code in 1998. With this offence, less serious but repeated violent acts committed by a man against a present or former female partner are to be judged as one serious offence. The stipulated sanction for this offence is imprisonment between 6 months and 6 years. The purpose of this article is to evaluate how the police, the prosecutors and the courts deal with this new offence. The article also present results from an evaluation of restraining orders in Sweden.

  • 45285.
    Lindström, Peter
    Växjö University, Police officer programme.
    Violence against women in the Swedish context2005In: Family Violence and Police Response: Learning From Research, Policy and Practice in European Countries / [ed] Marijke Malsch, Wilma Smeenk, Routledge, 2005, p. 105-125Chapter in book (Refereed)
  • 45286.
    Lindström, Peter
    et al.
    Police Region Stockholm, Sweden;Malmö University, Sweden.
    Sempert, UlfPolice Region South, Sweden;Malmö University, Sweden.
    Kriminologi och poliskunskap: mötet mellan forskning och praktik2018Collection (editor) (Other academic)
  • 45287.
    Lindström, Peter
    et al.
    Swedish National Police College.
    Svanberg, K.
    Victim-Offender Mediation in Sweden1998In: Restorative Justice for Juveniles: Potentialities, Risks, and Problems / [ed] I L. Walgrave, Leuven: Leuven University Press , 1998, p. 245-260Chapter in book (Other academic)
  • 45288.
    Lindström, Rasmus
    Linnaeus University, Faculty of Arts and Humanities, Department of Swedish Language.
    Dokumentation av elevers talspråkliga färdigheter: Lärares uppfattningar om former av och ändamål med dokumentation2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien var att utröna hur fem lärare i årskurs 1–3 resonerar om och uppfattar dokumentation av elevers talspråkliga färdigheter. Vilken form av dokumentation lärare beskriver sig använda i syfte att bedöma och följa upp elevers talspråkliga färdigheter och vilka ändamål med denna dokumentation lärare redogör för var de frågor studien syftade att besvara. Fem lärare i årskurserna 1–3 intervjuades på plats i sina respektive skolor. Intervjumaterialet transkriberades och analyserades utifrån analysmetoden innehållsanalys och Åsa Hirshs (2015) fem ändamål med IUP:er. Resultatet visar att lärare använder flera olika former för att dokumentera elevers talspråkliga färdigheter. Det ändamål med dokumentationen lärarna framhäver mest frekvent är att de nyttjar den som ett informationsbärande dokument för föräldrar och elever. Alla lärare lyfter fram minst ett dokumentationsändamål som inte omfattas av Hirshs (2015) typologier vilket bidrog till att tre nya dokumentationsändamål skapades. Därtill visar det sig att skriftliga anteckningar används utifrån flest antal ändamål medan elevskapat och nedskrivet material bara används för att engagera eleverna i bedömningen av sina kunskaper och observationsscheman bara för att informera om elevens nuvarande kunskaper.

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  • 45289.
    Lindström, Sandra
    Linnaeus University, Faculty of Social Sciences, Department of Social Work.
    Skolsocialt arbete på gymnasiet: Skolkuratorernas förutsättningar att arbeta utifrån evidensbaserad praktik2022Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    School counsellors have been an occupation in Sweden since the 1940s but despite this, there is very little knowledge and research about school counsellors’ preconditions according to their work. This study aims to examine in what frequencies school counsellors’ use evidence-based methods in their work with students in senior high school. The result is based on a survey with N 215 respondents from all over Sweden and the analysis theoretical perspective is founded on evidence-based practice (EBP) and new institutional theory. The result indicates that school counsellors in Sweden do not use evidence-based methods to such an extent and that there are organisational and structural obstacles for school counsellors to base their work from evidence-based practice. There is a decoupling process where ideals of EBP do not match the reality as different kinds of logic appear and come into conflict with each other over whose legitimacy is the one that should dominate the organizational field. To increase the conditions, a school management that provides support and enables professional guidance and competence development is needed. The research field needs to start looking at the school counsellors’ practice from a bottom-up perspective to see what they do that works and develop EBP and the organizational field based on this. This is one way to give school counsellors’ more legitimacy. 

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  • 45290.
    Lindström, Sofia
    et al.
    Linnaeus University, Faculty of Health, Social Work and Behavioural Sciences, School of Education, Psychology and Sport Science.
    Rönneke-Widerström, Alexander
    Linnaeus University, Faculty of Health, Social Work and Behavioural Sciences, School of Education, Psychology and Sport Science.
    Grammatikens roll i språkundervisning2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I föreliggande examensarbete är syftet att undersöka lärares och elevers inställning till grammatik i språkundervisning i skolans senare år. Som språklärare är det viktigt att gå djupare in på hur grammatik bäst kan läras ut och att som språklärare vara medveten sina val av undervisningssätt. Detta är intressant att veta för att kunna hålla en bra kvalité i undervisningen samt för att möta elevens problematik kring språkinlärning. I studerandet av språkinlärningsteorier visade det sig att grammatikundervisningen främst är uppdelad i två inriktningar: grammatik som produkt och/eller process. Grammatikundervisningen präglas oftast av antingen den ena eller den andra men läraren kan även använda sig av båda sätten för att få en mer nyanserad undervisning. Uppsatsen använder sig av en kvalitativ intervju-undersökningsmetod med elever och lärare som informanter. Lärarna undervisar i engelska och/eller svenska och eleverna går i deras undervisningsgrupper. Elever i årskurs nio deltar då de förmodades vara mogna nog att reflektera kring sitt lärande. Resultatet av undersökningen visar att både elever och lärare tycker att grammatik är viktigt. Lärarna undervisar grammatik i både svenska och i engelska, trots att det inte är betygsgrundande. Eleverna har svårt att reflektera kring sin egen inlärning men tycker att det skulle underlätta med mer variation i undervisningen. Lärarna använder sig av en traditionell förmedlingspedagogik med analytiskt perspektiv och ser oftast grammatik som en produkt.

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  • 45291.
    Lindström, Susanna
    et al.
    Linnaeus University, Faculty of Social Sciences, Department of Pedagogy and Learning.
    Liljeqvist, Malin
    Linnaeus University, Faculty of Social Sciences, Department of Pedagogy and Learning.
    Tillgängliga lärmiljöer och tydliggörande pedagogik för ökad inkludering och delaktighet: - ur ett pedagog- och elevperspektiv2019Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studiens syfte är att undersöka hur pedagoger och elever i grundskolan upplever specialpedagogiskt stöd och stimulans, genom användandet av specialpedagogiskt material och gemensamma stödstrukturer, kan bidra till delaktighet, tillgängliga lärmiljöer och därmed inkludering. Vilka möjligheter och vinster liksom hinder och svårigheter upplevs? Semistrukturerade kvalitativa intervjuer genomfördes med pedagoger och elever, vilka deltagit i ett skolutvecklingsarbete, samt en kompletterande enkät till pedagoger. Respondenternas svar sammanställdes utifrån riktlinjer i kvalitativ metod och resultatet analyserades utifrån de teoretiska utgångspunkterna inkludering, samhälls-och strukturperspektiv och relationellt perspektiv.

    Respondenternas beskrivningar visar att specialpedagogiskt material (Stöd- och strukturlådor, SoS-lådor med taktilt och visuellt material) och tydliggörande pedagogik i form av gemensamma stödstrukturer (färgkoder och strukturer över vecka, dag och lektion) bidrar till en gemensamhetsorienterad inkludering. Genom att öka elevers delaktighet och göra lärmiljön mer tillgänglig, proaktivt likt UDL (Universal Design för Lärande), gynnas alla elever, i synnerhet de med NPF-problematik. Hinder som nämns är svårigheten att få samtliga pedagoger att anamma arbetssättet, liksom att pedagogerna initialt upplever det tidskrävande. Vinsterna beskrivs överväga och både pedagoger och elever är eniga om att de nu inte skulle vilja vara utan materialet och strukturerna.

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  • 45292.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    A generalized uniqueness theorem for limit cycles in a predator-prey system1989In: Acta Academiae Aboensis, Vol. 49, no 2, p. 1-9Article in journal (Other academic)
  • 45293.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Dependencies between Competition and Predation - and their Consequenses for Initial Value Sensitivity1999In: SIAM Journal of Applied Mathematics, Vol. 59(4):1468-1486, no 4, p. 1468-1486Article in journal (Refereed)
  • 45294.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Detecting chaos requires careful analysis of nearly periodic data2009In: Chaos, Solitons & Fractals, ISSN 0960-0779, E-ISSN 1873-2887, Vol. 42, no 1, p. 212-223Article in journal (Refereed)
    Abstract [en]

    We show that models fitted to data in many cases fit unstable periodic solutions in attracting periodic solutions of the 'true model' that generated the data. An attracting solution containing the neighborhood of the fitted unstable solution in its domain of attraction may possess entirely different dynamical properties. Thus, an attracting chaotic solution with positive Lyapunov exponent may describe periodic solutions with negative Lyapunov exponents and vice versa. These problems can in principle be remedied, if the fitted models would be allowed to contain an arbitrary complexity and if an infinite amount of data would be available. We claim that we stay far from such limits in ecology, for instance. Therefore, we think our approach is essential to bear in mind when making data-based predictions concerning dynamical behavior. Our general conclusion is that less data is required in nearly periodic cases than in chaotic cases for rejecting models not allowing complex behavior.

  • 45295.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Detecting chaos requires careful analysis of periodic data (extended abstract)2008In: University of Kalmar 6th International Conference on Technologies from Waste and Wastewater Treatment, Energy from Waste, Remediation of Contaminated Sites, and Emissions Related to Climate / [ed] Fabio Kaczala, Jeanger Juanga, William Hogland, Marcia Marques, and Eva Vinrot, Kalmar, Sweden, 2008Conference paper (Other academic)
  • 45296.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Discrete models and Fisher's maximum principle in ecology2003In: Discrete and continuous dynamical systems Expanded volume for the Wilmington Meeting, May 24-27, 2003 / [ed] Wei Feng, Shouchuan Hu, and Xin Lu, Springfield, USA, 2003Conference paper (Refereed)
  • 45297.
    Lindström, Torsten
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Dynamical properties of maps fitted to data in the noise-free limit2013In: Journal of Biological Dynamics, ISSN 1751-3758, E-ISSN 1751-3766, Vol. 7, no S1, p. 108-116Article in journal (Refereed)
    Abstract [en]

    We argue that any attempt to classify dynamical properties from nonlinear finite time-series data requires a mechanistic model fitting the data better than piecewise linear models according to standard model selection criteria. Such a procedure seems necessary but still not sufficient.

  • 45298.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Fitting TAR(1) models to Sheperd data2007In: Proc. Appl. Math. Mech. 7, 2007Conference paper (Refereed)
  • 45299.
    Lindström, Torsten
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Friskolor - ett hot mot glesbygden2010Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    "Det kostar olika mycket att driva skolor i olika områden." Torsten Lindström, docent i matematik på Linnéuniversitetet i Kalmar har synpunkter på den svenska friskolesystemet.

  • 45300.
    Lindström, Torsten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Global stability of a model for competing predators1994In: Marcel Dekker, Inc analysis, algebra, and computers in mathematical research, proceedings of the twenty-first Nordic Congress of mathematicians / [ed] Mats Gyllenberg and Lars-Erik Persson, New York, Basel, Hong Kong, 1994Conference paper (Refereed)
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