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  • 13051.
    Jansson, Peter M.
    et al.
    Jönköping University, School of Health and Welfare.
    Kullberg, C.
    Masculinity constructions and acceptance of violence against women among men convicted of violent crimes and men in a pro-feminist network opposing men's violence in SwedenManuscript (preprint) (Other academic)
  • 13052.
    Jansson, Peter M.
    et al.
    Högskolan Dalarna, Socialt arbete.
    Kullberg, Christian
    Mälardalens högskola.
    Ambivalent attitudes towards equality and violence against women among men in a pro-feminist network2017Conference paper (Refereed)
    Abstract [en]

    Abstract

    There is a great need for more knowledge on how a pro-feminist masculinity that challenges the normative hegemonic masculinity can be developed. To achieve this, it is important to gain more knowledge on how pro-feminist men relate to gender quality, violence in general and violence against women in particular, and when and why their reasoning points to ambivalence.The study was based on secondary analyzes of qualitative interviews done with five men active in a pro-feminist network in Sweden. The research questions applied spanned over several areas: socioeconomic status, masculinity construction and the men’s proximity to violence. Data analysis method used was content analysis, and as a means of increasing the reliability, member-check was used. The study was approved by the Regional Ethical Review Board.On a general level, the results show that the men’s masculine construction towards gender equality corresponded with their privileged position as regards to their socioeconomic status, as regards to educational level and job career. The men were positive to gender equality and opposed both men’s control of woman and violence against women. More in-depth analysis thus shows that the interviewed men acknowledged using some forms of less overt control over women and thus in some sense showed ambivalent attitude to gender equality. The men also, somewhat paradoxically, accepted some conventional forms of men’s violence.

    A conclusion from the study is that the conditions that the results highlights may pose problems for the development of gender equality and the ending of violence against women. This is because to make violence against women end all men, and particularly pro-feminist men, need to renounce all forms of violence and be aware of how gender equality can be weakened or strengthened by all different forms of gender interaction.

  • 13053.
    Jansson, Peter M.
    et al.
    Högskolan Dalarna, Socialt arbete.
    Kullberg, Christian
    Högskolan Dalarna, Socialt arbete.
    Violent men: Problems, Interventions and Change2011In: Safe Community Conference 2011, Falun, 2011Conference paper (Other academic)
    Abstract [en]

    The aim of the project is twofold, on the one hand to study how Swedish men with different masculinity positions reflect and relate to violence in general in the other hand to study interventions to rehabilitate men with violence problems and these interventions potential to rehabilitate and change mens behaviour.

  • 13054.
    Jansson, Peter M.
    et al.
    Dalarna University.
    Saxonberg, Steven
    Dalarna University.
    Are asymmetrical power relations a hidden obstacle to successful rehabilitation of violent men? An explorative study on the methodology to investigate shame2013In: Aggression and Violent Behavior, ISSN 1359-1789, E-ISSN 1873-6335, Vol. 18, no 6, p. 745-752Article in journal (Refereed)
    Abstract [en]

    The study starts from Retzinger (1995), Retzinger and Scheff (2000) and Scheff and Retzinger's (2000, 2001) micro-sociological perspective on social bonds, with the general aim of constructing a model consisting of operationalized indicators that opens for a simplified ability to analyze the relationship between power relations and emotions in private and institutionalized meetings. Scheff & Retzinger have provided a comprehensive guide to how the state of the social bond can be decoded by the direct access to non-verbal data. But since this type of data is both difficult to obtain, difficult to analyze and time consuming, therapists need simplified methods that can provide insight into the state of social bonds. We also need a method that takes into account the issue of power relations — both power relations in society and power relations between the client and the therapist. The treatment of men with violence problems provides an example of how our model can be applied to therapeutic activity. The examination shows that it is possible to construct a model with operationalized indicators that facilitate visualization of the relationship between power and the quality of social bonds.

  • 13055.
    Jansson, Philip
    Jönköping University, School of Education and Communication.
    Spel och moral: En studie om de moraliska omständigheterna kring TV-spelet This War of Mine1991Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A study about the moral circumstances of the video-game This war of mine. By use of earlier research it establishes a connection between video-games and our behavior. Through that and the arguments of Michel Sicart I define video-games as an ethical object. With that as a main premise, I continue to analyze This War of Mine (abbreviated as TWoM) using normative, ethical models, with the purpose of highlighting the games underlying values. The main component of the study is divided into two parts: analysis of the games twelve, playable characters and analysis of the games rules. The results establish that the games underlying, ethical values are universalistic in nature with a tone of utilitarianism through the quantitative and contextual natures of how your actions are measured.

  • 13056.
    Jansson, Pär
    et al.
    Jönköping University, School of Education and Communication, HLK, Media and communication science.
    Norberg, Erik
    Jönköping University, School of Education and Communication, HLK, Media and communication science.
    Stridh Carlson, Emma
    Jönköping University, School of Education and Communication, HLK, Media and communication science.
    Då zappar de inte vidare: En semiotisk studie kring uppfattningar om kommunikationsstrategier i TV-reklam2008Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Television advertising is something that the vast majority comes in contact with every day, and it is a common topic of conversation. Discussions may focus on the funny commercials that you can see on TV at the moment or how annoying it is when an exciting movie stops for a commercial break. What we can say is that people have an opinion about television advertising; some people think that advertising is something positive and some people see it as negative.A thesis from 2008 made at Gothenburg University showed that only 14% of the population perceive television advertising as something positive. Despite this, television remains one of the largest advertising forums in Sweden. 2006, the investment in television advertising stood for 15% of the total investment in advertising. Is it possible to receive TV advertising to become popular with most? Or at least reduce the negativity of television advertising? There have been four different communication strategies to adapt marketing to the audience that is most interesting. These communication strategies are developed based on the audience thinking, rational or emotional. They are also based on how motivated the audience is in their buying behavior. These strategies are the basis of our study. Our study raises the question if one of the communication strategies is more appreciated than the others, and in that case, what does that strategy contain that the other strategies lack? A response to this could lead to the conclusion that not all television advertisements are perceived as equally negative, and thus, by using the most positively perceived communication strategy, it would be easier for a company to get its message across. Many companies spend large sums on televisionadvertising and they want to feel sure that their message gets across. Now their intended consumers change channel during the commercial break because the advertising is seen as boring and annoying.

  • 13057.
    Jansson, Simon
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Wangström, Marcus
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    CEOs' Remuneration Systems: A Study of the Five Largest Listed Banks in the UK2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Purpose – The purpose of this study is to analyse and compare how the CEOs’ remuneration systems have evolved within the five largest listed UK banks between 2008-2013. The banks are HSBC, Barclays, Royal Bank of Scotland, Lloyds Banking Group, and Standard Chartered. Of interest is also what impacts that can be derived in the CEO’s remuneration structures considering implemented laws and regulations.

    Research Design – A deductive approach is used in this multiple-case study in order to answer the research questions. The study encompasses the time span 2008-2013 and therefore a longitudinal design is used for the data collection. The data of interest is presented in the banks’ consolidated annual reports, these documents are published on each of the banks’ websites, where we have retrieved them from. The data was then processed, the components of the remuneration system were divided into four categories; base salary, annual incentives, deferred incentives, and allowances. Further, a content analysis was carried out based on these categories and put in tables in order to interpret the data. 

    Findings – The findings demonstrate that the Capital Requirement Directive IV has had and will have even more impact in the future. The banks have started to adapt their remuneration packages or state that they are planning to do so in order to comply with the stipulated regulations. The banks have however not decreased the size of the remuneration packages for their CEOs. In HSBC, Royal Bank of Scotland and Lloyds Banking Group the remuneration has rather been reallocated to other components that are classified as fixed pay (base salary, allowances) instead of variable pay (annual incentives) as a way to evade the intentions of the Capital Requirement Directive IV. Barclays and Standard Chartered state that they will use the component allowance with a start in 2014. During the period our findings reveals that the banks’ profits has decreased while the CEOs’ remuneration has increased, however all five banks state that the CEOs’ remuneration packages will decrease with a start in 2014.

    Contribution – This study contributes with knowledge regarding the development of the CEOs’ remuneration systems in five UK banks between the years 2008-2013. It also provides insights about the Capital Requirement Directive IV and what impacts it has had, which enabled us to confirm that the banks find their ways in order to evade it. 

  • 13058.
    Jansson, Susanne
    et al.
    Jönköping University, School of Health and Welfare. Linköping University, Psychiatry Section, Department of Medical and Health Sciences, Linköping, Sweden.
    Fridlund, Bengt
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science. Jönköping University, School of Health and Welfare, HHJ. ADULT.
    Perceptions among psychiatric staff of creating a therapeutic alliance with patients on community treatment orders2016In: Issues in Mental Health Nursing, ISSN 0161-2840, E-ISSN 1096-4673, Vol. 37, no 10, p. 701-707Article in journal (Refereed)
    Abstract [en]

    A therapeutic alliance with a continuing collaboration between a patient and psychiatric staff is a resource for helping patients cope with the demands of coercive legislation. Knowledge exists describing coercion in inpatient care while the knowledge regarding the perceptions of creating a therapeutic alliance with patients on Community Treatment Orders (CTO) among psychiatric staff is scarce. To describe perceptions among psychiatric staff of creating a therapeutic alliance with patients on CTOs, an exploratory design using a phenomenographic method was employed. Thirteen semi-structured audio-taped interviews were conducted with psychiatric staff responsible for patients on CTOs. The staff worked in five different outpatient clinics and the interviews were conducted at their workplaces. The analysis resulted in in four metaphors: the persevering psychiatric staff, the learning psychiatric staff, the participating psychiatric staff, and the motivating psychiatric staff. Patients on CTOs were more time-consuming for psychiatric staff in care and treatment. Long-term planning is required in which the creation of a therapeutic alliance entails the patient gradually gaining greater self-awareness and wanting to visit the outpatient clinic. The professional–patient relationship is essential and if a therapeutic alliance is not created, the patient's continued care and treatment in the community is vulnerable.

  • 13059.
    Jansson, Therése
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Källmyr, Nicole
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Jämförelse mellan total lungkapacitetberäknat utifrån single-breath metangasspädningrespektive kroppspletysmografi2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Total lung capacity (TLC) is the gas volume in the lungs after maximal inspiration. It can be calculated using whole-body plethysmography, pressure changes and Boyle’s law, or using gas dilution with methane or helium as inert gas. Agreement between the methods is of interest to make substitution of the more commonly used whole-body plethysmography with methane dilution possible.

    This retrospective cross-sectional study aimed to compare TLC from single-breath methane dilution with TLC from whole-body plethysmography. Data concerning patients who underwent these two standard procedure examinations in one visit was collected. The population of 48 had an even gender distribution, included ages 10 to 87 and patients with or without known respiratory diseases.

    TLC from whole-body plethysmography ranged between 2,6 and 8,4 liters. TLC from methane dilution ranged between 2,5 and 7,7 liters. TLC from gas dilution averaged 0,59 liters less than TLC from whole-body plethysmography and underestimated TLC by 11,3%. Paired samples t-test determined the difference between methods to be significant.

    Due to the nature of this population, further studies of larger populations are needed. Methane dilution TLC amounted to 88,7% of TLC from whole-body plethysmography which therefore cannot be substituted with methane dilution without increased risk of underestimating TLC.

  • 13060.
    Jansson, Wiktor
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Johansson, Ilja
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Mehrnoosh, Ali
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Sponsorship - Attitudinal Effects of Sponsorship2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose: To investigate how attitudes of hockey supporters change towards a sponsoring company depending on fan type and team commitment.

    Background: Sponsorship has become a widely accepted and used as a communication tool. In Sweden, sponsoring is a large part of all advertising conducted in the country. Previous studies within the subject of sponsorship show that generally sponsorship is a good affair for companies that engage in it. When it comes to sports sponsorship, hockey is the most developed sport in Sweden.

    Sports sponsorship is also an area where negative effects could occur due to sponsoring and the fact that many people are very passionate when it comes to sports and their favorite teams. Considering the massive amounts that companies invest in sponsoring it is of great interest to further investigate the effects of such activities. There is quite little research conducted within sports sponsoring in Sweden and therefore it is of interest both from businesses as well as the academic world to investigate the effects of sponsorship in a Swedish context. The main focus of this study is to investigate possible positive and negative attitudes towards sponsoring companies that sponsor different teams as well as effects on brand recall based on fan commitment.

    Method: In order to answer the purpose of this thesis a deductive approach was applied by collecting quantitative data from an experiment, control group and a follow-up study. Theories and previous research in the subject area was used in order to establish hypothesis that later has been tested.  The data retrieved through the research was processed and analyzed using SPSS.

    Conclusion: The results show that attitudes towards the sponsor are positive when associated with the supported team and negative when associated with the rival team. Fans viewer frequency did not have a significant impact on positive attitudes towards the supported team while fan commitment had a strong impact on negative attitudes towards the sponsor of the rival team. Brand recall was higher with highly committed fans and is correlated with fan commitment. It is concluded that negative attitudes are easily invoked by fan commitment while it is not as easy to build positive attitude with repeated viewings.

  • 13061.
    Jansson Åkerberg, Kassandra
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science.
    Calanas Lund, Grace
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science.
    Att vara anhörig till yngre personer som drabbas av demenssjukdom2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie var att beskriva anhörigas erfarenheter av att leva med yngre personer med demenssjukdom. När en yngre person drabbas av demenssjukdom påverkas hela familjen. Personen som drabbas blir helt beroende av sin familj och det begränsar livsutrymmet för de anhöriga. För att svara på syftet gjordes en litteraturöversikt med kvalitativ metod, baserad på tolv vetenskapliga artiklar. Resultatet delades upp i två huvudkategorier med åtta underkategorier som beskriver olika erfarenheter som anhöriga har av att leva med en yngre person med demenssjukdom både före och efter diagnostisering. Kategorierna var: 1. Förändringar i livet med underkategorier: en annan person, osäkerhet före och efter diagnostisering, oro inför framtiden och sorg, behov av hjälp och stöd. 2. Ett liv med ökad belastning och har underkategorier: förlust och saknad, social isolering, försämrat välbefinnande, användning av olika copingstrategier. Resultatet kan öka sjuksköterskans kunskaper kring tidig debut av demenssjukdom, öppenhet och förbereda för att göra undersökningar för att stärka misstankar och inte dra förhastade slutsatser.

  • 13062.
    Jansund, Bodil
    et al.
    Institutionen för Kulturgeografi och ekonomisk geografi vid Göteborgs universitet.
    Westermark, Åsa
    Jönköping University, School of Education and Communication, HLK, School Based Research, Social Studies and Didactics.
    Tidsgeografi i undervisning för hållbar utveckling: En helhetsorienterad tankemodell2013In: Geografiska Notiser, ISSN 0016-724X, Vol. 71, no 1, p. 24-40Article in journal (Other academic)
  • 13063.
    Jantorp, Sanna
    et al.
    Jönköping University, School of Education and Communication, HLK, Media and Communication Studies.
    Stenström, Madeleine
    Jönköping University, School of Education and Communication, HLK, Media and Communication Studies.
    I skidbacken är allt ett spel: En semiotisk analys av grafisk design i den spelifierade tjänsten Myskistar2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna studie avser analysera hur de grafiska delarna i den spelifierade tjänsten Myskistar kan tolkas och därefter undersöka deras relation med tjänstens spelelement. Uppsatsen är tänkt att öka förståelsen för hur visuella element kan uppfattas i en spelifierad tjänst och vad elementen säger i relation till spelteori.

    Uppsatsens teoretiska ramverk består av ett urval med begrepp från semiotisk teori, grafisk teori och spelteori. Detta ramverk ämnar förklara vårt resultat för att besvara frågeställningarna. Undersökningen är begränsad till att undersöka 18 spelrelaterade grafiska element som en användare av tjänsten kan erhålla. Studien görs genom en semiotisk tolkande analys och knyts sedan samman med grafisk teori för att besvara hur de grafiska elementen kan tolkas. Därefter kopplas analysresultaten samman med spelteori för att besvara vad de grafiska elementen säger i relation till spelelementen.

    Studiens resultat visar att de grafiska elementen både kan vara förklarande och förvirrande för betraktaren. Grafiken krävde i stor utsträckning en tillhörande bildtext för att skapa ett tydligt meddelande. Övergripande sett stärktes spelelementens funktion med hjälp av visuella element och innehållet blev tydligare. Därmed förstärktes spelets regler och detta kan i sin tur skapa ett större engagemang hos användaren. Men det visuella kunde också påverka de grundläggande spelelementens budskap och därmed påverka tjänsten negativt. Studien har slutligen funnit att vissa grafiska element kan locka en viss typ av spelare. 

  • 13064.
    Jantunen, Ari
    et al.
    Lappeenranta University of Technology, School of Business.
    Ellonen, Hanna-Kaisa
    Lappeenranta University of Technology, School of Business.
    Johansson, Anette
    Jönköping University, Jönköping International Business School, JIBS, Marketing and Logistics. Jönköping University, Jönköping International Business School, JIBS, Media, Management and Transformation Centre (MMTC).
    Beyond appearances - Do dynamic capabilities of innovative firms actually differ?2012In: European Management Journal, ISSN 0263-2373, E-ISSN 1873-5681, Vol. 30, no 2, p. 141-155Article in journal (Refereed)
    Abstract [en]

    Dynamic capabilities are the higher-order capabilities needed for changing operational-level capabilities and learning in new domains, and thus they are critical for innovation activities. The aim of this study is to explore heterogeneity of dynamic capabilities in a comparative setting. We chose four innovative case firms representing a single industry, namely magazine publishing. The similarity of the cases provided a solid foundation for comparing their dynamic capabilities. Based on the results it seems that the practices comprising sensing capabilities are likely to be similar across firms within a single industry, while practices comprising seizing and reconfiguring types of capabilities may differ more between companies. Thus dynamic capabilities have both idiosyncratic and common features across an industry. These findings are relevant to practicing managers in that they illustrate that competing companies within the same industry tend to develop similar types of practices to match the changing requirement of the operating environment. Hence, managers should not be falsely comforted by the current situation within their firms, but proactively develop their unique capabilities to gain advantage over their competitors.

  • 13065.
    Janukovic, Dmitrijus
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Valtuille, Michel Martins
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Barrier Option Pricing, with Application to Option Delta Hedging2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Barrier option is the most important exotic option on the market and it is becoming more popular, mainly due to its lower cost when compared to standard vanilla options. Nonetheless, exotic options are difficult to price since the payoff is dependent on the path followed by the price of the underlying asset.

    This work introduces the fundamental concepts of barrier option valuation theory and continues presenting the nature of discretely monitored barrier options that cannot always be priced analytically. To solve this issue different numerical methods are used, the most commonly used ones are, namely, Monte Carlo simulation (MC) and finite difference method (FD), which we applied for barrier option pricing in this work.

    Additionally, software code was developed to find the down-and-out call option prices, which are then compared to the benchmark obtained via the Analytical Solution of Black-Scholes model. Supplementary, we investigate which of the algorithms is more efficient to our option delta hedging, in other words, which one delivers the highest cumulative P&L at the maturity.

    The research questions are: “Which barrier option pricing method is more accurate comparing the results to the chosen benchmark?” and “Which of the numerical methods used in barrier option pricing will result in the highest profit and loss (P&L) of the option delta hedging for the financial institution?”

    Despite of both methods’ tendency to converge to the benchmark, the findings of our study show that the finite difference option pricing method is faster to converge. Furthermore, the delta hedging using the finite difference method performed better achieving a higher P&L than MC, taking into account the initial price of the option.

  • 13066.
    Janze, Linda
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Lundberg, Michaela
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    When Proving You Are Right Is Not Enough: The Relationship Between Emotional Intelligence and Interest-Based Negotiations Among Purchasers2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the last decades, organizations have developed towards a decentralized structure with increased emphasis on sustainable business and long-term relationships. This progress has enhanced the role of human resources and contributed to the emergence of the concept of emotional intelligence and interest-based negotiations in organizations. This paper examines the possible relationship between high emotional intelligence and interest-based negotiations. In this quantitative study, the sample consists of 51 purchasers, the data is gathered through a self-completion survey and analyzed through multiple linear regression analyses and a Pearson correlation analysis.  The findings indicate a relationship between high emotional intelligence and the use of an interest-based negotiation, but demonstrate varying correlation between the subcategories of the concepts. This implies that organizations should consider emotional intelligence as a complementary aspect during recruitment processes and in competence development.  

  • 13067.
    Jaouni, Heba
    et al.
    Jönköping University, Jönköping International Business School.
    Zahirovic, Amela
    Jönköping University, Jönköping International Business School.
    Nordquist, Frida
    Jönköping University, Jönköping International Business School.
    Jonsons Byggnads AB: Cultural changes after an external sale2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many family businesses will have to change owner during the coming years as those born in the 1940s will retire. Due to the fact that the younger generations follow their own pro-fessions and are not always interested in taking over the family business, complications may occur for the owner manager. In such cases the owners will have to take another action in passing over the company.The case of Jonsons Byggnads AB is a clear example of where the previous owner‟s sons followed their own passion of profession and were not interested to take over the family firm, which had been operating for around 50 years. This resulted in an external sale of the corporation to Fadi Babil, who today is the new sole owner of the company.This thesis will investigate how Jonsons Byggnads AB´s culture has been influenced by the external sale. What factors have changed within the company and why these changes oc-curred, are further discussed issues.A case study approach was chosen to achieve the purpose. Through a qualitative method an analysis will be implemented on the empirical data with the use of theoretical frame-work. The case concerns the corporate culture in Jonson‟s Byggnads AB. The empirical da-ta was collected through interviews and a survey.The results from the interviews and surveys showed that changes in Jonsons Byggnads AB‟s organizational culture have occurred. These changes have not harmed the company in any specific way although one can notice that the company is more focused on success and expansion of the company.

  • 13068.
    Jardbring, Henrik
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research.
    Wetterholm, Lennart
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research.
    Yrkeselevers motivation för skolarbetet: En fenomenografisk studie av gymnasieelevers uppfattningar2008In: Forskande lärare i praktiken: Vol. 3, Jönköping: Högskolan för lärande och kommunikation , 2008, p. 49-82Chapter in book (Other academic)
  • 13069.
    Jardenius, Daniel
    et al.
    Jönköping University, School of Health Science, HHJ, Dep. of Rehabilitation.
    Johansson, Emil
    Jönköping University, School of Health Science, HHJ, Dep. of Rehabilitation.
    Fotens plantara tryck med hellånga variserande och valgiserande inläggskilar2008Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Introduction

    Wedged shoe insoles are used as a treatment for different problems in order to change the ground reaction force. They can secondary cause different loading patterns under the foot compared to normal. No previous study has, to the author’s knowledge, clinically evaluated the plantar foot pressure with different full-length wedges in normal persons.

    Purpose

    The purpose was to evaluate the plantar pressure with different degrees of full-length wedges in normal persons.

    Method

    Twenty persons with normal feet have participated in this single blind study. Wedges were produced clinically in four different shapes, 3° valgus, 0° flat, 3° varus och 6° varus. The test persons were told to walk with the wedges in their comfortable pace in a randomized order. The plantar pressure was measured in the medial and lateral heel as well as in the first and fifth metatarsal head.

    Results

    The results show significant increased mean pressure for varus wedges compared to flat as well as valgus wedges, in the area of the medial heel and first metatarsal joint. Also, valgus wedges show significant increased mean pressure compared to flat condition in area of the medial heel. There is no correlation between wedge height and mean pressure for any of the wedge conditions.

    Conclusion

    Treatment with wedges leads secondary to increased mean pressure for varus wedges compared to flat as well as valgus wedges, in medial heel and first metatarsal joint. Furthermore, valgus wedges show increased mean pressure compared to flat condition in medial heel. Patients sensitive to high plantar pressures in these areas should be treated with caution.  Further studies are recommended.

     

  • 13070. Jardmo, Karin
    När lärare lär tillsammans: En kvalitativ studie om lärares erfarenheter av kollegiala observationer2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The school of today is constantly changing and is continuously being faced with new requirements. In order to meet these challenges, school development is therefore a necessity. The purpose of the study is to investigate and describe how collegial observations is perceived by teachers and intends to highlight what is perceived positively and the difficulties with collegial observations as a method for developing teaching.  The question of the study is: What factors influence the work of collegial observations according to teachers? A socio-cultural perspective has been used as a theoretical framework.  This is a qualitative study and eight semi-structured interviews are conducted and as a method of analysis a qualitative content analysis with an inductive approach was used. The empirical data was categorized into seven themes with factors that, according to the teachers, influenced collegial observations: Relationship, Experience, Documentation, Distance, Purpose of the Observation and Organization. The result indicates that the teachers experience collegial observations as a valuable way of developing their teaching, but that there are certain factors that are perceived as obstacles. These difficulties include that of insecurity caused by insufficient relationships, lack of experience, teachers having varying approaches to the task and the sense of time shortage is present. Successful factors in the outcome indicate that the teachers created new relationships, gained experience and received support in the form of auxiliary structures such as an observation protocol that developed the observations.

  • 13071. Jardmo, Karin
    et al.
    Svensson, Annika
    Bidrar tydliga mål till ett ökat lärande?: En studie om hur elever uppfattar målbeskrivningar2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 13072.
    Jarfors, A. E. W.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    A Discussion of the Dynamic Specific Heat during Solidification2003In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 437-438, p. 391-394Article in journal (Other academic)
    Abstract [en]

    State-of-the-art solidification theory shows that the apparent latent heat of fusion decreases with increasing cooling rates, due to the creation of lattice defects. A portion of the defects condenses during and after solidification, releasing heat, causing the apparent specific heat to be dynamic. Experimental data on copper shows an increase and a maximum in the apparent specific heat at moderate cooling rates. An extension of the existing theory for dynamic specific heats is made. Previous models do not reproduce the maximum, nor do they reproduce the equilibrium value at low cooling rates. The presently derived model reproduces all essential features of the experimentally data. It also clearly shows that the effect at moderate cooling rates is significant and the tabulated values are not applicable for modelling casting.

  • 13073.
    Jarfors, A. E. W.
    KTH-IMP/MG, Stockholm, Sweden.
    Influence of carbon on the phases in the copper-titanium system and their precipitation1999In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 34, no 18, p. 4533-4544Article in journal (Refereed)
    Abstract [en]

    The influence of carbon on the phases occurring in the copper-titanium system has been experimentally investigated. Samples were fabricated from elemental copper and titanium. Carbon was added in the form of graphite or as titanium carbide. The samples were encapsulated, heat-treated at 1173 or 1373 K for 24 h and subsequently quenched in brine. The phases present at the treatment temperature were identified, as well as the phases occurring during solidification. The microstructure indicates the presence of a miscibility gap. The composition of the phases were determined using EDS-analysis. The composition of the copper phase was found to show a great variation caused by the precipitation sequence during quenching of the melts. The complex precipitation also caused both TiCu4 and the meta-stable TiCu3 to form. The composition of TiCu was found to show a wider compositional interval than earlier found. The variation of its composition with the nominal composition suggests that TiCu can dissolve carbon. The pure Ti phases also showed larger solubility of copper than earlier found. An outline of the precipitation sequence is made.

  • 13074.
    Jarfors, A. E. W.
    Swed. Institute for Metals Research, Stockholm, Sweden.
    Melting and coarsening of A356 during preheating for semisolid forming2004In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 17, no 4, p. 229-237Article in journal (Refereed)
    Abstract [en]

    The melting and coarsening behaviour of A356 during preheating for semisolid forming has been investigated theoretically and experimentally. The preheating involves a relatively rapid heating and a partial melting, transforming the material into a mushy state, i.e. a mixture of solid particles and melt. The experiments reveal a change in melting behaviour over the temperature interval 580-590°C, where a re-solidification occurs during heating. During the initial phase of melting, the smallest solid particles melt completely and larger particles are split into smaller particles, making the shape of the particles more irregular. Particle fragmentation influences the occurrence of the enclosed eutectic, which temporarily maintains a higher solid fraction as a result of increased diffusion distances. Resolidification and coarsening contribute to a rapid particle size increase. The model derived fits the experimental series well and supports the coarsening and particle fragmentation observations. © 2004 W. S. Maney & Son Ltd.

  • 13075.
    Jarfors, A. E. W.
    Department of Materials Processing, Royal Institute of Technology, Metals Casting Research Group, Stockholm, Sweden.
    On the design of a rotary spray former: Experimental and theoretical background1997In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 71, no 3, p. 440-455Article in journal (Refereed)
    Abstract [en]

    The phenomenological theory for jet stability and spray formation in centrifugal spraying is reviewed and investigated experimentally. The appropriate set of equations is then adapted to the phenomena found in the present study. The flow on the disk is treated both theoretically, as well as experimentally, leading to the possible design of a spray former. The droplet formation mechanisms are studied implicitly in the experiments, three different modes being found. A bi-modal spray is formed from the disk edge by two modes of disintegration, whilst the third mode is caused by instability at jet impact on the disk and causes a tri-modal spray. The boundary conditions for the release and flight of the droplets are treated theoretically and correlated experimentally. Water was used initially as a model material, due to the ease of direct visual observation, the knowledge acquired then being used to interpret experiments where an A17Si0.3Mg alloy is sprayed. The experimentally-obtained parameters are used in a theoretical treatment to predict the flow on the disk, i.e. the spray directions and the flight of the droplets. The general conclusion is that it is feasible to design a rotary spray former with a directed flow, the key issue being to control the jet width and the actual droplet formation at the disk edge. ©1997 Elsevier Science S.A.

  • 13076.
    Jarfors, A. E. W.
    Royal Institute of Technology, KTH, Department of Materials Processing, Stockholm, Sweden.
    Peritecticlike precipitation of titanium carbide in Al-Ti-C melts at 1373 K1999In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 15, no 5, p. 481-494Article in journal (Refereed)
    Abstract [en]

    The reaction between an Al-Ti melt and a carbon containing medium, i.e. pure graphite or molten aluminium containing aluminium carbide, was studied. Experiments were carried out at 1373 K, using three different experimental setups. Depending on the carbon source, titanium carbide precipitated as a layer or as free particles. Classical nucleation theory for homogeneous and heterogeneous nucleation is used to assess the surface tension. The influence of stoichiometry on surface tension and nucleation is discussed. The formation of a continuous layer, or peritecticlike precipitation of titanium carbide, is theoretically analysed. The growth of the layer is rate controlled by the mass transfer of carbon at the interface, plausibly as a result of the ordering tendencies in titanium carbide. The degeneration of precipitation into that of freely formed particles is found to be nucleation controlled. A model for degenerate precipitation is proposed, including predictions of the reaction front compositions, growth rate, and particle fractions in a dilute ternary system. The model is in good agreement with experiments, after compensating for settling of the precipitates, except in predicting the precipitated fractions. © 1999 IoM Communications Ltd.

  • 13077.
    Jarfors, A. E. W.
    Royal Institute of Technology, Department of Materials Processing, Stockholm, Sweden.
    Solidification behaviour of AI-7% Si-0.3% Mg during rotary spray forming1998In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 33, no 15, p. 3907-3918Article in journal (Refereed)
    Abstract [en]

    The solidification behaviour of an AI-7% Si-0.3% Mg alloy during rotary spray forming was studied. The ability to form a coating was insensitive to the thermal processing parameters, yielding material exchangess greater than 90%. The level of porosity varied typically between 1.5 and 4.75%. The dendrite arm spacing was evaluated and used to estimate the cooling rates. Typical dendrite secondary arm spacings were of the orderof 3 jam, 12 (am and 25 ÎŒm, corresponding to cooling rates of 4630 K s-1 72 K s-1 and 8 K s -1 respectively. The fraction primary precipitation was experimentally determined and the partition coefficient calculated indirectly using the Scheil equation. The partition coefficient is increased during rotary spray forming. This is explained by the presence of trapped vacancies at the solidification front. The vacancies change the solid's free energy and thus change the phase diagram and the partition coefficient. A simplistic analysis of entrapment and condensation of vacancies and their influence on the partition coefficient is made. © 1998 Kluwer Academic Publishers.

  • 13078.
    Jarfors, A. E. W.
    Department of Materials Processing, Royal Institute of Technology, Stockholm, Sweden.
    Solubility of copper in titanium carbide1996In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 12, no 12, p. 990-994Article in journal (Refereed)
    Abstract [en]

    The solubility of copper in titanium carbide (TiCx) was studied experimentally. The solubility was assessed in two different ways: (a) titanium carbide was added to a copper-titanium melt, (b) titanium carbides formed in situ, from graphite and titanium, were analysed. The stoichiometries were implicitly assessed. The solubility of copper in titanium carbide was found to decrease with increasing carbon content. This behaviour was compared to the solubility of chromium in titanium carbide, which increases in solubility with increasing carbon content. The role of vacancies in the solution is briefly discussed. © 1996 The Institute of Materials.

  • 13079.
    Jarfors, A. E. W.
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Butler, D. L.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Goi, K. L. S.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Microstructure formation of porous sintered Ti-Si-Zr compacts with mechanically alloyed-activated Ti-Si and TiH2 powders2014In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 594, p. 202-210Article in journal (Refereed)
    Abstract [en]

    Metallic implants are widely used in applications associated with bone. A major drawback of using metals is their elastic modulus which is higher than that of bone resulting in stress shielding and premature failure of the implant. The employment of biomaterials with a porous structure has the potential to lower the modulus and promote osseointegration. The present work investigates the microstructure formation and the resulting elastic modulus of a new Ti-Si-Zr alloy. The sintering procedure involves the use of both mechanically alloyed Ti-Si powder and TiH2 to activate sintering with the TiH2 also serving as a pore precursor. The procedure is designed to promote bonding but not consolidation. The influence of sintering temperature, heating rate, as well as the amount and size of the TiH2 on the phases formed and porosity was investigated. It was observed that the use of TiH2 increased the degree of porosity whilst the size of TiH2 particles could be used to control the pore size. The results showed that when using small TiH2 particles, the elastic modulus was strongly dependent on the fraction of TiH2. When large TiH2 particles were used, the porosity had no significant influence on the elastic modulus. The variation in behavior could be attributed to differences in microstructure. To control the bulk modulus it is essential to understand the differences in the microstructure formation mechanisms between these two cases. (C) 2014 Elsevier B.V. All rights reserved.

  • 13080.
    Jarfors, A. E. W
    et al.
    Department of Materials Processing, Royal Institute of Technology, Metal Casting Research Group, Kungl Tekniska Hogskolan, Stockholm, Sweden.
    Keife, H.
    Outokumpu Copper, Process Automation, Västerås, Sweden.
    Antonsson, T.
    Department of Materials Processing, Royal Institute of Technology, Metal Casting Research Group, Kungl Tekniska Hogskolan, Stockholm, Sweden.
    Deformation enhanced liquid phase sintering (DELPS): A study on the use of partial adiabatic melting during powder consolidation2002In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 127, no 2, p. 159-164Article in journal (Refereed)
    Abstract [en]

    The presence of a liquid phase enhances the pore closure of a porous body, which is used in liquid phase sintering (LPS). During LPS, a substantial grain growth may occur by coalescence or Ostwald ripening, thus a short time in the liquid state is advantageous. Furthermore, it has been shown that during the initial stage of LPS, agglomerates are disintegrated and a significant reduction of grain size occurs. Heavy deformation causes an adiabatic temperature increase, which may result in a partial melting of the powder. Short-time duration deformation-assisted LPS, so called deformation enhanced LPS (DELPS), may thus be a suitable route for the fabrication of difficult-to-form materials. The present study is a feasibility test of DELPS. Three different types of materials were tested. The first type was an Al-Si with the possibility to form a large fraction of liquid phase. The second type was a W-based powder mixture yielding a low fraction liquid. The third type was a Ni-Al powder mixture exhibiting an exothermal behaviour when reaction occurs. The powders were hot compacted in a flexible die allowing large deformations. The specimens were examined and the composition of the phases were analysed. All of the samples, but one, showed near full density (>98%). Evidence of melting was found and in the W-base and the Ni-Al powder mixtures, and reaction had occurred in the Ni-Al mixture. © 2002 Elsevier Science B.V. All rights reserved.

  • 13081.
    Jarfors, A. E. W.
    et al.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    Sim, G. C.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    San, T. E.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    Influence of Process Parameters on Reaction Products during Self-Propagating High-Temperature Synthesis of Porous NiTi2003In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 437-438, p. 475-478Article in journal (Refereed)
    Abstract [en]

    NiTi is proposed to be a biomaterial suitable for bone replacements. Reactive synthesis, Self-Propagating High-Temperature Synthesis (SHS) of NiTi from Ni and Ti powder is a suitable method to produce porous structures to promote osseointegration. The influence of pressed density and ignition temperature on the reaction products formed is investigated. Porosity after pressing was 20%, 30% and 40 % and ignition temperatures were 400°C, 500°C and 600°C. The reaction products found were NiTi, as well as Ti2Ni and Ni3Ti, in addition to residual Ni and Ti. The amount of NiTi formed increases with ignition temperature, with a maximum at an initial porosity of 30% and ignition temperature of 600°C. This coincides with the minimum amount of residual Ni and Ti. The reaction imbalance is caused by the formation of Ti2Ni at high pressed densities and by a preferential nucleation of Ni3Ti, both suggested to be dominated by the effective contact area between the Ni and Ti particles after pressing.

  • 13082.
    Jarfors, A. E. W.
    et al.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Tong, S.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Hu, B.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Sharma, S. N.
    Integrated Magnesium Techologies, Singapore.
    Wee, C.
    Integrated Magnesium Techologies, Singapore.
    Mechanism of lubrication-induced surface cracking in hot chamber die cast thin-walled AZ91D parts2003In: Materials and Manufacturing Processes, ISSN 1042-6914, E-ISSN 1532-2475, Vol. 18, no 4, p. 637-641Article in journal (Refereed)
    Abstract [en]

    Thin-walled hot chamber die cast parts are often used to make telephone casings and similar products having primarily requirements on weight and aesthetically satisfying surfaces. The post casting surface treatment often generates a glossy appearance. The glossy appearance makes it extremely sensitive to small-scale flaws, such as blisters, cold shuts, and cracks. Hot chamber die casting of thin-walled parts requires high filling speed and the use of lubrication because the parts have high aspect ratios. In the manufacturing of such high aspect ratio parts with a wall thickness of 0.6 mm, a new type of cold crack induced by the lubrication is observed. To some extent this defect is similar to a blister, but the characteristic bump is not formed and the actual crack is formed by thermal contraction along the high aspect ratio areas.

  • 13083.
    Jarfors, A. E. W.
    et al.
    Singapore Institute of Manufacturing Technology.
    Yong, J. M. S.
    Singapore Institute of Manufacturing Technology.
    Kainer, K. -U
    GKSS Forschungszentrum Geesthacht Gmbh, Germany.
    Tan, M. -J
    Nanyang Technological University, Singapore.
    Preface2010In: Materials & Design, ISSN 0261-3069, Vol. 31, no SUPPL. 1, p. S1-Article in journal (Other (popular science, discussion, etc.))
  • 13084.
    Jarfors, A.
    et al.
    Casting of Metals, Royal Institute of Technology, Stockholm, Sweden.
    Fredriksson, H.
    Casting of Metals, Royal Institute of Technology, Stockholm, Sweden.
    Froyen, L.
    Department MTM, Katholieke Universiteit Leuven, De Croylaan 2, B-3030 Heverlee, Belgium.
    On the thermodynamics and kinetics of carbides in the aluminium-rich corner of the AlTiC phase diagram1991In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 135, no C, p. 119-123Article in journal (Refereed)
    Abstract [en]

    Aluminium composites have a great potential because of their high strength-to-weight ratio. Carbides will in the future be powerful reinforcements. To be able to manufacture these it is of importance to know the thermodynamic properties and the kinetic limitations. The objective of this investigation is to study the equilibria between the carbides occurring in the AlTiC system as well as the initial precipitation and dissolution behaviour of these carbides. It can be shown that there is a change in stability between TiC and Al4C3, depending on both composition and temperature. To study the nucleation and precipitation behaviour of the carbides in liquid aluminium and aluminium alloys a set of alloys were melted and heated to an appropriate temperature in graphite crucibles. The effect of time and the effect of composition on the chemical reactions involving carbides have been investigated. A theoretical analysis of both the thermodynamics and kinetics was performed, giving a tentative explanation. © 1991.

  • 13085.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Casting Alloy Design and Modification2016In: Metals, ISSN 2075-4701, Vol. 6, no 1, article id 15Article in journal (Other academic)
  • 13086.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Insitu formed aluminium composites1998In: Advanced light alloys and composites, 1998Conference paper (Refereed)
  • 13087.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Special section: Selected papers from the 3rd international Conference on Cast Metal matrix Composites2001Collection (editor) (Refereed)
  • 13088.
    Jarfors, Anders E. W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Yielding and failure of hot chamber die cast thin-walled AZ91D2016In: Metallurgia Italiana, ISSN 0026-0843, Vol. 108, no 6, p. 53-56Article in journal (Refereed)
    Abstract [en]

    Thin-walled components in AZ91D magnesium are commonly cast using hot chamber die casting. AZ91D mechanical properties commonly show scatter and its low critically resolved shear stress cause early yield with an ill-defined yield point. This may result in large differences between the true yield point or proportionality limit and the off-set proof stress. The current study takes a look at this and its relation to the failure of the component. The material investigated was a hot chamber die cast material with a wall thickness of 0.8mm. Tensile tests were made and the proportionality limit and off-set proof stress was established as well as elongation to failure and tensile strength. The overall average off-set proof stress was 154 MPa and the overall proportionality limit was 63 MPa resulting in a typical property Stress Gap of 91MPa. This difference varied from 65MPa up to 105MPa. The Apparent Toughness was also evaluated The Stress Gap and Apparent Toughness was analysed and the influence of process parameters established.

  • 13089.
    Jarfors, Anders E. W.
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Castagne, Sylvie J.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Danno, Atsushi
    Singapore Institute of Manufacturing Technology, Singapore.
    Zhang, Xinping
    School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.
    Tool wear and life span variations in cold forming operations and their implications in microforming2017In: TECHNOLOGIES, ISSN 2227-7080, Vol. 5, no 1, article id 3Article, review/survey (Refereed)
    Abstract [en]

    The current paper aims to review tooling life span, failure modes and models in cold microforming processes. As there is nearly no information available on tool-life for microforming the starting point was conventional cold forming. In cold forming common failures are (1) over stressing of the tool; (2) abrasive wear; (3) galling or adhesive wear, and (4) fatigue failure. The large variation in tool life observed in production and how to predict this was reviewed as this is important to the viability of microforming based on that the tooling cost takes a higher portion of the part cost. Anisotropic properties of the tool materials affect tool life span and depend on both the as-received and in-service conditions. It was concluded that preconditioning of the tool surface, and coating are important to control wear and fatigue. Properly managed, the detrimental effects from surface particles can be reduced. Under high stress low-cycle fatigue conditions, fatigue failure form internal microstructures and inclusions are common. To improve abrasive wear resistance larger carbides are commonly the solution which will have a negative impact on tooling life as these tend to be the root cause of fatigue failures. This has significant impact on cold microforming.

  • 13090.
    Jarfors, Anders E.W.
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zheng, Jinchuan
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-solid Metal Technology, Sanming, China.
    Chen, Liang
    RheoMet Light Metal Co., Ltd, Jiangle Economic Development Zone, Sanming, China.
    Yang, Jie
    KinRui Hi-Tech Co. Ltd, Sanming, China.
    Recent advances in commercial application of the rheometal process in China and Europe2019In: Semi-Solid of Alloys and Composites / [ed] Rassili A.,Midson S.P.,Zhu Q.,Gang Hu X., Trans Tech Publications, 2019, p. 405-410Conference paper (Refereed)
    Abstract [en]

    Recent advances in rheocasting have resulted in significant expansion in the types of products currently in full commercial production. The current paper gives an overview of components in production in Europe and in China produced using the RheoMetal™ process, that has taken the lead in a strong drive towards new heavy-duty applications made from aluminium alloys. In China, the dominating applications are found in the telecom industry. The trend in Europe is more towards marine and automotive applications commonly in fatigue loaded applications. The reason for the choice of rheocasting for complicated shape thin-walled electronics components with requirements is dominated by process yield and by the ability to improve thermal conductivity. The heavy-duty truck chassis thick walled components target weight reduction through design and to sustain fatigue load normally requiring forged components. Common in all applications are seen in production yield, reduced tool wear and reduction of die soldering.

  • 13091.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Matsushita, Taishi
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Bogdanoff, Toni
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Börrisson, Markus
    SWEREA Swecast.
    Beste, Ulrik
    VBN Components AB.
    Effect of Use in High Pressure Die Casting on Vibenite®60 Tool Inserts Madeby Additive Manufacturing2016In: DDMC2016 Frauenhofer Direct Digital Manufacturing Conference: Conference Proceedings, March 2016, Berlin, Germany / [ed] B. Müller, Fraunhofer IRB Verlag, 2016Conference paper (Refereed)
    Abstract [en]

    The thermo-physical and mechanical properties of Vibenite®60 was investigated in the as-manufactured, soft annealed and hardened state as well as after use in full scale high pressure die casting. Thermal conductivity in the as manufactured state was 23.3 to 27.5 W/mK in the temperature range from 25°C to 500°C. Annealing increased thermal conductivity to 25.0 up to 29.2 W/mK. Hardening reduced thermal conductivity of 19.8 to 26.1 W/mK. The tool wastested in production in the as fabricated state displayed a slight increase in thermal conductivity, which was interpreted as a slight tempering during use. Hardness measurements were made at room temperature and followed the same pattern as the thermo-physical properties. Rockwell and Vickers Hardness was lowest in the as lowest in the annealed state and hardest in the hardened state. Rockwell hardness was not affected by use in production while Vickers hardness decreased slightly.

  • 13092.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Rigovacca, Diego
    University of Padua, Italy.
    Payandeh, Mostafa
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jansson, Per
    COMPtech.
    Influence of process parameters on surface appearance and roughness of a low Si containing Al-alloy, in semisolid casting2015In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 217-218, p. 318-324Article in journal (Refereed)
    Abstract [en]

    The visual appearance and surface roughness were experimentally investigated inindustrial scale for a low silicon containing aluminium alloy cast in semisolid state integrated withHPDC machine. A visual comparative technique and surface roughness in the form of the Rq valuewere used to evaluate the surface appearance and the surface roughness respectively. The resultswere investigated statistically to find significant models. It was shown that high quality appearance,following a comparative scale, was possible using high die temperature and high injection speed. Itwas also found that improving the surface roughness will deteriorate the visual appearance.

  • 13093.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Metal casting2014In: Handbook of Manufacturing Engineering and Technology / [ed] Andrew Y. C. Nee, London: Springer, 2014, p. 309-410Chapter in book (Refereed)
  • 13094.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Olofsson, Jakob
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Critical Description of Defects and Mechanical Behaviour in Casting Process Modelling of Light Metals for Automotive Use2013In: Proceedings of the Twenty Second International Conference on Processing and Fabrication of Advanced Materials (PFAM-XXII), Singapore, 18-20 December, 2013, ACM Digital Library, 2013Conference paper (Refereed)
  • 13095.
    Jarfors, Anders
    et al.
    Royal Institute of technology.
    Svendsen, L
    Royal Institute of technology.
    Wallinder, M
    Royal Institute of technology.
    Fredriksson, H
    Royal Institute of technology.
    Reactions during infiltration of graphite fibres by molten Al-Ti alloy1993In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 24, no 11, p. 2577-2583Article in journal (Refereed)
    Abstract [en]

    The infiltration sequence of graphite fibers with liquid aluminum alloyed with titanium was studied. The titanium concentration was chosen such that a severe reaction occurred between the fibers and the melt. Aluminum carbide and titanium carbide, as well as an aluminide phase were formed. The phenomenon occurring during the infiltration sequence was explained with the aid of the ternary-phase diagram Al-Ti-C. The effect of the reaction on the infiltration height is discussed.

  • 13096. Jarfors, Björn
    et al.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Ordbok - dictionary: svensk - English: tillverkningsteknik - manufacturing technology2018Book (Other academic)
    Abstract [en]

    Preface: This dictionary is designed to facilitate studies in manufacturing technology and is a collaboration between teachers and students in mechanical andmaterials engineering at Jönköping University and Blekinge Institute ofTechnology.

  • 13097.
    Jargic, Svetozar
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Credit Spread Determinants: Significance of systematic and idiosyncratic variables2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Credit spread is the extra risk-reward that an investor is bearing for investing in corporate bonds instead of government bonds. Structural models, which are simple in their framework, fail to explain the occurring credit spread and underestimate the predicted credit spread. Hence, the need for new models and exploration of systematic and idiosyncratic variables arose. The present paper aims to investigate if the predictability of lower-medium investment grade bonds and non-investment grade bonds credit spread can be improved by incorporating systematic and idiosyncratic variables into a fixed effect panel data regression model, and whether the selected variables’ significance has high influence on credit spread or not. Initial results showed that fixed effect panel data regression model underperforms the structural models and under predicts the actual credit spread. The applied model explained 13.5% of the lower-medium investment grade bonds credit spread and 8.5% of non-investment grade bonds. Further, systematic variables have higher influence on lower-medium investment grade bonds and idiosyncratic variables have higher influence on non-investment grade bonds. The predictability of credit spread can be improved by employing correct explanatory variables which are selected based on the characteristics of the sample size.

  • 13098.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. HHJ. CHILD.
    Att nå sitt mål1993Report (Other (popular scientific, debate etc.))
  • 13099.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. HHJ. CHILD.
    Att välja inriktning i livet - verklighet eller illusion1993Report (Other scientific)
  • 13100.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Brukarinflytande på individnivå: verklighet eller illusion. Vetlanda2003Other (Other (popular science, discussion, etc.))
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