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  • 29051.
    Zhang, Yafan
    et al.
    Acreo AB, Department of NetLab, Kista, Sweden.
    Nee, Hans Peter
    The Royal Institute of Technology (KTH), School of Electrical Engineering, Stockholm, Sweden.
    Hammam, Tag
    Swerea KIMAB AB, Department of Joining Technology, Kista, Sweden.
    Belov, Ilja
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Ranstad, Per
    GE Power Sweden AB, Department of Electrical Energy Conversion, Vaxjo, Sweden.
    Bakowski, Mietek
    Acreo AB, Department of NetLab, Kista, Sweden.
    Multiphysics Characterization of a Novel SiC Power Module2019In: IEEE Transactions on Components, Packaging, and Manufacturing Technology, ISSN 2156-3950, E-ISSN 2156-3985, Vol. 9, no 3, p. 489-501Article in journal (Refereed)
    Abstract [en]

    This paper proposes a novel power module concept specially designed for highly reliable silicon carbide power devices for medium- and high-power applications. The concept consists of two clamped structures: 1) a press-pack power stage accommodating silicon carbide power switch dies, and 2) perpendicularly clamped press-pack heatsinks, in which, the heatsinks are in contact with electrically insulated case plates of the power stage. The concept enables bondless package with symmetric double-sided cooling of the dies and allows for an order of magnitude higher clamping force on the heatsinks than what can be applied on the dies. The concept has been evaluated in a first demonstrator (half-bridge configuration with ten paralleled silicon carbide dies in each position). Experimental methodologies, setups, and procedures have been presented. The commutation loop inductance is approximately 9 nH at 78 kHz. The junction-to-case thermal resistance is approximately 0.028 K/W. Furthermore, a simplified 3D finite element thermomechanical model representing the center unit of the demonstrator, has been established for the purpose of future optimization. The accuracy of the simulated temperatures is within 4 % compared to the measurements. Finally, a 3D thermomechanical stress distribution map has been obtained for the simplified model of the demonstrator. 

  • 29052.
    Zhang, Yiping
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Yu, Xinyi
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Gilles, Sintset
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Enterprise System Post-Implementation: A Practice of System Evaluation Issues in Health Care Organization: A case study of Jönköping County Council2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Introduction: As Information Technology (IT) becomes more and more advanced, the Enterprise System (ES) starts to attract researcher’s attention. While with the high rate of failure IT projects, it is important to evaluate the IT project properly. This paper conducts a case study in the Health Care area and chooses Jönköping County Council’s ROS system to be the target system. According to the established linkage between theory and real world organization, a practice of Enterprise System Evaluation is conducted by using an existing Uwizeyemungu et al.’s Enterprise System Effects Evaluation Model (ESEM). The research questions are as follows:

    1. What are the Enterprise Systems Effects which impact on business processes?
    2. To what extend do the ES effects impact on the business processes?

    Purpose: the study is an exploratory study that aims at identifying what are the ES Effects which impact on the business processes and assessing the importance and the actual degree of these effects. The answers of the first goal are explored by analyzing the documents and the record of interview, and the results are the basis of the second question.

    Method: This research has adopted a combined approach because of the nature of the research questions. Data has been collected through face-to-face interview, survey and the organizational documents. Secondary data are also be used for analyzing. Both qualitative and quantitative data are used for getting a reliable conclusion.

    Conclusions: The Enterprise System effects can be categorized into automaional effects, informational effects and transformational effects. The relationship between such effects and Performance indicators are very important. By determining the importance and impacts degree of such relationships, the evaluation results can be explicitly calculated and understood.

  • 29053.
    Zhang, Zuotai
    et al.
    Royal Institute of Technology, Sweden.
    Matsushita, Taishi
    Royal Institute of Technology, Sweden.
    Li, Wenchao
    Seetharaman, Seshadri
    Royal Institute of Technology, Sweden.
    Investigation of wetting characteristics of liquid iron on dense MgAlON-based ceramics by x-ray sessile drop technique2006In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 37, no 3, p. 421-429Article in journal (Refereed)
    Abstract [en]

    The wetting characteristics of liquid iron on dense MoAlON-based composite ceramics were investigated using X-ray sessile drop technique. The contact angles were measured on substrates of different composites as functions of temperature and varying partial pressures of oxygen. The results with pure argon gas showed that contact angles kept almost constant in the temperature range 1823 to 1873 K. The contact angle was found to show a slight increase with increasing boron nitride (BN) content in MgAlON-BN composites. These are attributed to the higher contact angle between BN substrate and liquid iron drop compared with that obtained for MgAlON substrate. When the CO-CO2-Ar gas mixtures were introduced into the system, the contact angle showed an initial quick decrease followed by a slow decrease and then a period of nearly constant contact angle at a given temperature corresponding to the steady-state condition. Even in this case, BN seemed to cause an increase in the equilibrium contact angle. The equilibrium contact angle was found to decrease with increasing temperature. XRD results indicated that the substrate was oxidized and the oxidation products combined with FeO formed by the oxidation of the iron drop to form FeAl2O4 and Mg1-xFexO. These were likely to form a ternary FeO-Al2O3-MgO slag or a quaternary slag by combining with B2O3. An interesting observation is that the iron drop moved away from the original site, probably due to the Marangoni effect.

  • 29054.
    Zhang, Zuotai
    et al.
    Royal Institute of Technology, Sweden.
    Matsushita, Taishi
    Royal Institute of Technology, Sweden.
    Li, Wenchao
    Seetharaman, Seshadri
    Royal Institute of Technology, Sweden.
    Reactions between MgAlON-BN Composites and CaO-SiO2-Al2O3-MgO-“FeO” Slag2007In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 38, no 2, p. 231-241Article in journal (Refereed)
    Abstract [en]

    The reactions between MgAlON and MgAlON-BN composites and synthetic CaO-SiO2-Al2O3-MgO-“FeO” slag at different temperatures were investigated under stagnant condition using the ‘‘finger’’ experiment as well as X-ray sessile drop methods. The corrosion rate was denoted by the radius difference between the initial radius of the specimen rod and the unreacted core at definite time intervals. The experimental results showed that the radius difference is linear with the square root of time. This indicated that the diffusion of ions in the slag through the product layer is the rate-determining step. One product layer was observed between the unreacted core and slag. X-ray images showed that gas bubbles were generated during the slag penetration. The slag penetration process depends strongly on the temperature. The apparent activation energy was evaluated to be 376.4 kJ/mol. The FeO addition into slag increased the slag corrosion rate. This is most probably due to the decrease of the slag viscosity, because the Fe+2 generally behaves as a network breaker. Furthermore, MgAlON and boron nitride (BN) can be oxidized by FeO, which also increased the slag corrosion rate. The slag corrosion rate decreased with increasing BN content. This can be explained by the fact that the grain boundary interfacial energy decreases with the increase of BN content and nonwetting of BN by molten slag compared to pure MgAlON.

  • 29055.
    Zhao, Can
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    Huang, Zhewei
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    The Impact of Trade Openness on Urbanization: A study of Eastern China2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis analyses the impact of trade openness on urbanization in eastern China during the period of 1987 to 2005. The theoretical framework shows that open trade has a positive impact on growth of urban population, because trade serve as a factor that creates great job opportunities. According to the descriptive data, the massive rural-urban migrations are mostly concentrated in the eastern coastline of China where trade was started. Previous studies concluded that there is a positive relationship between trade openness and urbani-zation.Our study is based on a set of panel data from the period of 1987 to 2005 within 6 coast-line provinces. After running 4 different regressions we found that, 3 of the regression models revealed positive and statistically significant at 1% results, which suggest that the impact of trade openness on urbanization is positive.

  • 29056.
    Zhao, Guosheng
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    CSR and its Impact on Consumer Behavior: A Study of the Cosmetic Industry2012Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Problem: CSR appears frequently in various kinds of reports of different corporations. However, managers are confused about how to practice CSR strategically. Little is known about consumers’ awareness of CSR and how consumers react toward socially responsible corporations and their products. The cosmetic industry has been criticized a lot on CSR because of unethical and unsustainable business activities. Renowned companies in the cosmetic industry are working on different CSR initiatives, but no single study has been done on CSR and its impact on consumer behavior in the cosmetic industry. It is of critical importance to investigate consumers’ awareness of CSR, and to explore consumers’ attitudes and tendency of purchase behavior toward CSR in the cosmetic industry.

    Purpose: The purpose of the thesis is to investigate consumers’ awareness of CSR in the cosmetic industry and channels consumers get CSR information from. Furthermore, the aim is to investigate consumers’ attitudes on different CSR activities and how consumers’ purchasing behaviors are affected by these CSR activities.

    Theoretical perspective: The study combines stakeholder theory with theory on CSR’s impact on consumers’ attitudes and behavior. It refers to consumers as one important stakeholder group for a corporation.

    Method: A quantitative method is used in the study. Primary data of consumers’ awareness of CSR, consumers’ attitudes and tendency of purchasing behavior were collected through an online questionnaire. The results of the questionnaire were analyzed and interpreted.

    Conclusions: Consumers get CSR information of the cosmetic industry from different channels. Consumers’ CSR information about the cosmetic industry is between “poor” and “average”. They expect cosmetic companies to communicate more about CSR with the public. CSR is not an important factor that influences consumers’ purchase decision. However, consumers are willing to pay more for cosmetic products made in socially responsible ways. Consumers believe it is important that cosmetic companies fulfill their legal and ethical responsibilities, but they do not ask cosmetic companies to be philanthropically responsible.

  • 29057.
    ZHAO, QIAN
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Centre of Logistics and Supply Chain Management.
    ZHOU, BOWEN
    Jönköping University, Jönköping International Business School, JIBS, Centre of Logistics and Supply Chain Management.
    Application of Lean Focus onManufacturing Process: A Case Study of an American Furniture Company2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introduction: To improvement the target company’s manufacturing process by applyinglean principles, including using and analyzing the internal value stream mapping. Asmore and more companies have paid attention to implement lean thinking in theirmanufacturing process, the value stream mapping played an important role for manycompanies to make a transition from their traditional production systems to lean systems.The content and resources of this master thesis come from an American furniturecompany named KAMA which mainly produces office furniture with different components.Although there are various types of products, the authors merely focus on the officechair products. This research is an attempt to understand and analyze the problemsin the production flow on the example of KAMA’s office chair products that includesPH product family as the target research part.Purpose: The purpose of this research study is to investigate, analyze and find out solutionsfor waste-related problems in the office chair manufacturing flow of KAMA.Method: A single case study will be applied in this study paper. Data should be collectedfrom telephone interviews with company’s managements, the studying ofKAMA’s internal documentation and the secondary data from lean project report collectedby Consultant EIMI. In order to improve the production process, the valuestream mapping method will be applied to build the current value state map of CompanyKAMA and identify the potential wastes during the manufacturing process, andthen analyze and give the solutions for future improvement. Additional, other methodsincluding the order penetration point analysis, make-to-stock theory, and the CONWIPanalysis have been subsequently applied in designing a draft of the future state map.Conclusion: From the constructed current value stream mapping of KAMA officechair manufacturing process, it can be found that the most essential wastes are overproduction,waiting, unnecessary inventory and unnecessary movement. In addition, theimproper workstation arrangement and unnecessary waiting time have been identified asthe critical wasting reasons. Thus, any solutions to reduce or eliminate the identifiedwastes have been considered and would be given in the future state. In order to improvethe efficiency and reduce the unnecessary movements, adopting the appropriate cellularlayout in the mechanical workshop is quite beneficial. The mentioned methods to reducewastes have been summarized in the draft of the future state map of the company.The main benefits of the proposed future state value stream mapping are faster and accurateorder fulfillment process, reduction of unnecessary movements in workshop, lowinventory, high productivity and reduced costs in the flow of KAMA’s manufacturingprocess.

  • 29058.
    Zhen, Rong
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Riveiro, Maria
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Jin, Yongxing
    Merchant Marine College, Shanghai Maritime University, Shanghai, China.
    A novel analytic framework of real-time multi-vessel collision risk assessment for maritime traffic surveillance2017In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 145, p. 492-501Article in journal (Refereed)
    Abstract [en]

    Multi-vessel collision risk assessment for maritime traffic surveillance is a key technique to ensure the safety and security of maritime traffic and transportation. This paper proposes a framework of real-time multi-vessel collision assessment that combines a spatial clustering process (DBSCAN) for detecting clusters of encounter vessels and a multi-vessel collision risk index model for encounter vessels within each cluster from the large amounts of monitored vessels in a surveyed sea area. First, the vessels monitored are clustered using DBSCAN to obtain the clusters of encounter vessels, filtering out the relatively safe vessels. Then, the dynamic motion relation between encounter vessels within each cluster is modeled to obtain DCPA and TCPA. The semantic and mathematical relationship of vessel collision risk index for each cluster of encounter vessels with DCPA and TCAP is constructed using a negative exponential function. To illustrate the effectiveness of the framework proposed, an experimental case study has been carried out within the west coastal waters of Sweden. The results show that our framework is effective and efficient at detecting and ranking collision risk indexes between encounter vessels within each duster, which allows an automatic risk prioritization of encounter vessels for further investigation by operators. Hence, this framework can improve the safety and security of vessel traffic transportation and reduce the loss of lives and property.

  • 29059.
    Zheng, Guo
    Jönköping University, Jönköping International Business School, JIBS, Economics, Finance and Statistics.
    Determinants of FDI inflows to CEE countries: In comparison to EU-152015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 29060.
    Zheng, Jingchen
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    How do family firms cope with economic crisis?: Case studies about Chinese family firms2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introduction:The current economic crisis started in 2007 warned many business pro-fessions how important it is to react to the crisis quickly and properly. Many studies have been conducted on family businesses about their special resources environment, succession, governance etc. There are barely literature has ever mentioned about how family business cope with economic crisis. Thus, the author conducted such a study on this topic to explore more in family business study.Purpose:To enhance the understanding of economic crisis management in fam-ily business, this thesis will analyze the actions of family firms during the economic crisis. This research aims to investigate how unique fam-ily firm resources influence the way they cope with the economic crisis.Method:A qualitative research has been conducted in this study. In-depth inter-views were conducted in two family business firms with the business owners and other high level position staff who have clear picture about the management during economic crisis. Tele-interview was adopted due to the distance limit.Conclusions:During economic crisis, family firms do not use layoff as a major means to cost down. They keep relative stable relationship with their employ-ees as well as other business partners. They seek financial and other help from the family members or in the family network rather than other external resources such as bank etc. The governance also con-cerns more on employee benefits.

  • 29061.
    Zheng, Ruoxi
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Jiang, Nan
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Cross-border acquisitions in Chinese manufacturing industry: An institutional perspective2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cross-border acquisitions as effective strategic choicesare used widely to enhance competitive advantages inChinese enterprises in manufacturing industry. The decisionmaking is influenced by certain institutions under theuniqueness of Chinese socialism system. This study investigatesthe influence of institutions towards the decisionmaking of cross-border acquisitions.

    The study aims to build a conceptual model to identifythe major regulative institutions and how they are influencingthe decision making of cross-border acquisitionsin Chinese manufacturing industry.

    The study conducts a case study on Lenovo and Geelybased on secondary data to investigate the influence ofregulative institutions on cross-border acquisitions.

    The decision making of cross-border acquisitions inmanufacturing enterprises is influenced by regulative institutionsfrom international and national level which presentedin three ways. First, the supportive regulation institutionscreate a favorable environment for cross-borderacquisitions. Second, government promotes cross-borderacquisitions by using policy as guidance. Third, the imperfectof the legal system impede the organizationsprogress.

  • 29062.
    Zheng, Wei
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    Oil Price and Economic Growth: Evidence of China2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 29063.
    Zhong, Lijing
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    The Role of Content in Facilitating Social Media Engagement with Consumers in China: - A study on foreign fashion brands on Sina Weibo2016Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
  • 29064.
    Zhou, Chao
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Zhang, Dong
    Jönköping University, School of Engineering, JTH, Industrial Engineering and Management.
    Adoption of COBIT5 and ITIL in Small and Medium Size Enterprises in China2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigates the adoption of COBIT5 and ITIL used as the frameworks for IT governance (ITG) in Chinese Small and Medium Size Enterprises(SMEs). With the implementation of IT governance, the IT will be fully used to promote the core business of the enterprise and the risk and investments of IT will be balanced.

    To achieve the purpose of this thesis, questionnaire and mail survey are used as the method for research. We received 140 responds from the Chinese SMEs and these data are used to analysis and the results are used to answer the research questions.

    As a result shows that , ITIL is more adopted by Chinese SMEs since its solution gets from the best practice and easier to apply than COBIT. In addition, the author generate suggestion for Chinese SMEs and hope these suggestions will improve the IT governance work in those companies.

  • 29065.
    Zhou, Haoyong
    et al.
    Keele Management School, Staffordshire, UK.
    He, Fan
    Department of Finance, School of Business, Central Connecticut State University, New Britain, CT, United States.
    Wang, Yangbo
    SKK Graduate School of Business, Seoul, South Korea.
    Did family firms perform better during the financial crisis?: New insights from the S&P 500 firms2017In: Global Finance Journal, ISSN 1044-0283, E-ISSN 1873-5665, Vol. 33, p. 88-103Article in journal (Refereed)
    Abstract [en]

    This paper provides new evidence on whether family firms performed better during the global financial crisis (2008–2010). Using the dataset of the S&P 500 nonfinancial firms during the period 2006–2010, we find that family firms outperformed nonfamily firms during the crisis. Among family firms, the ones that contributed to the outperformance were those where the founder was still present. We also find that during the global financial crisis, founder firms invested significantly less and had better access to the credit market than nonfamily firms. Our analysis suggests that the superior performance of founder firms is largely caused by their having less incentive to overinvest in order to boost short-term earnings during the crisis. 

  • 29066.
    Zhou, Lili
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Internationalize Mergers and Acquisitions2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As globalization processes, an increasing number of companies use mergers and acquisitions as a tool to achieve company growth in the international business world. The purpose of this thesis is to investigate the process of an international M&A and analyze the factors leading to success.

    The research started with reviewing different academic theory. The important aspects in both pre-M&A phase and post-M&A phase have been studied in depth. Because of the complexity in international M&A, a qualitative method has been used in the research. The empirical findings of the case study have mainly been collected from.semi-structured interviews.

    The investigation shows that an international M&A is a tried-and-tested process from initial identification to integration. The process can be summarized into five steps: identification, evaluation, negotiation, implementation and integration. The important factors contributing to the success of international M&As are found to be corporate selection capability, cultural differences, human resources and communication.

  • 29067.
    Zhou, Shoujin
    et al.
    Peking University, China.
    Caccamo, Marta
    University of International Business and Economics, China.
    Review And Revision: Theory And Practice of Corporate Philanthropy in China2013In: Journal of International Business Ethics, ISSN 1940-1485, Vol. 6, no 1/2, p. 42-56Article in journal (Refereed)
    Abstract [en]

    Corporate philanthropy has played an indispensable role in public welfare areas 1 in China since its emergence in the 1990s. As an "emerging philanthropic market" (Michon & Tandon, 2012) where entrepreneurship or corporate citizenship is still to be entrenched in the society, the progress of corporate philanthropy in China is crucial for cultivating the philanthropic spirit of society and fostering the growth of civil society. Therefore, it is worthwhile to pay more attention and make more investigation into the theory and practice of corporate philanthropy in China (Lu, 2002; Ge, 2007). The present paper aims to make a general review of the state of this particular area and to discuss potential ways to optimize current frameworks.

  • 29068.
    Zhou, Taoyuan
    et al.
    Jönköping University, Jönköping International Business School.
    Liu, Huarong
    Jönköping University, Jönköping International Business School.
    Empirical study on CAPM on China stock market2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 29069.
    Zhou, Xin
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Alija, Teuta
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Ochoche, Owoicho
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Poison Pills: A management-shareholder benefits comparison2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Problem: The problem of this thesis involves the controversy that the implementation of poison pills generates. The conflict amongst various stakeholders that are affected directly or indirectly by the implementation of the poison pill also contributes significantly to the problem of this thesis.

    Purpose: The purpose of this thesis is to investigate and compare the benefits of the poison pill adoption on shareholder and management interests. We also seek to evaluate arguments for and against pill adoption, and determine if these arguments are valid in view of facts established from our study.

    Conclusions: Our study in this thesis has brought us to five conclusions about the poison pill policy in fulfillment of the purpose. We state in our conclusion that arguments for and against the poison pill can both be validated depending on the case, we also state that a general conclusion cannot be drawn as to the negative or positive effect of the poison pill on stakeholders. We proceed to argue that the pill is a very effective fighting toll in the current business world and state that more should be done to regulate pill implementation. We finish up our conclusion by identifying what appears to be an inverse relationship between management and shareholders benefits from the implementation of the pill.

    Originality: The uniqueness of our study resides in the theoretical framework that is developed from two prevailing hypotheses in the academic research of the poison pill. The previous studies either take on the management entrenchment hypothesis (MEH) or the shareholder interest hypothesis (SIH). However, we have combined the elements of both hypotheses and jointly revealed the advantages and disadvantages of the pill adoption for both management and shareholders via our original management shareholder benefits comparison matrix.

  • 29070.
    Zhu, Baiwei
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Casting and anodising of Al alloys- Alloy design, manufacturing process and material properties2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Casting and semi-solid metal (SSM) casting are widely used to manufacture near-net-shape components of Al-Si alloys in the automotive and electronic industries. In such applications, casting components need to meet the combined requirements of good mechanical properties and corrosion and wear resistance. Hence, a good understanding of the relevant aspects such as material design, manufacturing and surface treatments have a significant impact on the final performance of the component. The objective of this thesis is to understand the interaction among manufacturing and surface treatments and how their combination impacts the microstructure and final properties. The results will accordingly highlight the potential for improving the mechanical and anodising properties of rheocast components.

    The influence of the most relevant alloying elements has been investigated in this study. It is found that Si and Fe have a significant influence on anodising. During anodising, Si particles are oxidised at a much lower rate than Al phase and embedded in the oxide layer. Due to the presence of Si particles and their morphology, residual metallic Al phase and cracks are introduced in the oxide layer. A reduced number of residual metallic Al phase, as well as defects, can be obtained by changing the Si particle morphology to disconnected fibrous by Sr modification. On the contrary, Fe-rich intermetallics could be partly dissolved during anodising, leaving vacancies or voids as defects in the oxide layer. So, it was proved that by modifying Si particles and removing Fe-rich intermetallics from the surface, the defects in the oxide layer are reduced, and better corrosion protection is achieved.

    The SSM process increases the microstructural inhomogeneity such as transverse macrosegregation and longitudinal macrosegregation in the cast component. The results show that the presence of surface liquid segregation (SLS) layer by transverse macrosegregation does not have a significant impact on the corrosion resistance and hardness of the oxide layer of as-cast surfaces compared to liquid casting. The longitudinal macrosegregation influences the corrosion protection provided by the anodised layer but does not affect the hardness of the rheocast component before or after anodising. In this study, it is also found that, during the casting of Al-Si alloys, the surface of the component can be enriched in Fe-rich intermetallics due to the SLS or interaction with the die material. Despite this affects only the very superficial thickness, it has a big impact on the corrosion resistance and hardness of the oxide layer.

    This study has revealed that the high value of the oxide layer thickness, as well as the hydrothermal sealing, is not a guarantee for improving the corrosion resistance of the oxide layer. An increase of the oxide layer thickness by increasing applied voltage or anodising time decreases both the corrosion resistance and hardness of the oxide layer. Moreover, the hydrothermal sealing after anodising significantly decreases the corrosion protection provided by the anodised layer in Al-Si alloys due to cracks formation.

    This study has observed that the casting defects such as oxide film, cold shots and the solute-rich layer which are related to the casting process dominate the fatigue behaviours of the SSM cast components. The fractographic examination indicates that the oxide film, cold shots and solute-rich layer act as crack initiation points during fatigue testing. Therefore, it was found that, in these conditions, the anodising does not have an evident impact on fatigue properties, despite the anodising process adds a brittle anodised layer on the surface.

  • 29071.
    Zhu, Baiwei
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Persson, Per (Contributor)
    Jarfors, Anders (Contributor)
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Leisner, Peter (Contributor)
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Zanella, Caterina (Contributor)
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Effect of Si particle modification on the growth and microstructure of anodised aluminium oxide2016Other (Other academic)
  • 29072.
    Zhu, Baiwei
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    On the influence of Si on anodising and mechanical properties of cast aluminium alloys2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The combination of two cost-effective processes, i.e. casting and anodising, would be an interest for the aluminium component applications. However, there are some obstacles in the application of anodising on cast Al alloys. The challenges mostly relate to the alloying elements especially Si and the surface quality. With the development of casting process, cast aluminium alloys with low Si content can be casted, and a complex geometry component with reasonably good surface finish can be achieved. This study aims to identify the influence of Si on anodising and mechanical properties of Al-Si alloys.

    In this study, six Al-Si alloys with three different Si level and two different Sr level were investigated. Sr acts as a modifier to change the morphology of Si particles. The directional solidification technology was used to vary the microstructure coarseness by controlling the cooling rate to study the influence of Si level, Si particle morphology and cooling rate on mechanical properties, oxide layer formation and corrosion protection performance in cast Al-Si alloys.

    This study has observed that Si has a significant influence on anodising. During anodising, Si particles are anodised at a lower rate than the Al phase. The presence of Si particles in eutectic phase make the oxide layer locally thinner and more defected due to the low oxide growth rate in eutectic phase. This study observed the presence of residual metallic Al phase beneath or between Si particles. Due to their presence and their geometry, Al can be shielded by Si particles and prevented from oxidation. Si particles also act as a key role in the corrosion protection of oxide layer in Al-Si alloys. The corrosion attack propagates along Si particles as well as oxide defects to the Al substrate.

    It is found that the morphology of Si particles has a significant influence on the oxide layer formation and corrosion protection performance of the oxide layer on cast Al-Si alloys. A substantially improvement the corrosion resistance of anodised layer on Al-Si alloys is attributed to the morphology change from interconnected flakes to disconnected Si fibres when Sr is added, with less oxide defects and better oxide distribution.

    The Si level governs the mechanical properties of Al-Si based alloys. An increase of Si content in Al alloys improves the mechanical properties such as ultimate tensile and yield strength as well as hardness of the materials, but decreases the ductility. However, an increase of Si level in Al alloys decreases the thickness of oxide layer, and thereby, the corrosion protection of the oxide layer is deteriorated.

  • 29073.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Fedel, Michele
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. SP-Technical Research Institute of Sweden, Borås, Sweden.
    Deflorian, Flavio
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Effect of Si content and morphology on corrosion resistance of anodized cast Al-Si alloys2017In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 7, p. C435-C441Article in journal (Refereed)
    Abstract [en]

    This paper investigates the influence of Si content and Si particle morphology on the corrosion protection of anodized oxide layers on Al-Si alloys. Two Al alloys with low Si concentrations (2.43 wt-% and 5.45 wt-%, respectively) were studied and compared with 6082-T6 via electrochemical impedance spectroscopy (EIS) in 3 wt-% NaCl solution prior to oxide layer sealing. Si particles were also modified by the addition of Sr to study the influence of Si particle morphology on the corrosion protection of the oxide layer. The EIS showed that the corrosion protection provided by the oxide layer on Al-Si alloys is significantly affected by the presence of Si particles. Si particles make the oxide layer locally thinner and more defective in the eutectic region, thereby increasing the ease of substrate corrosion attack. However, the addition of Sr can improve the corrosion protection of anodized Al-Si alloys significantly. Furthermore, it was proved that higher Si level influences negatively the anodized oxide corrosion protection due to the higher amount of cracks and defects, but Sr modification is efficient in preventing this negative effect.

  • 29074.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Fedel, Michele
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. RISE Research Institute of Sweden, Borås, Sweden.
    Deflorian, Flavio
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Influence of the Sr modification and post-treatment on corrosion resistance of oxide layer of cast Al-(low)Si alloys2017In: EUROCORR 2017 - The Annual Congress of the European Federation of Corrosion, 20th International Corrosion Congress and Process Safety Congress 2017, Asociace koroznich inzenyru z.s.- AKI - Czech Association of Corrosion Engineers , 2017, p. 27-39Conference paper (Refereed)
    Abstract [en]

    The current development of casting process makes it possible to cast low Si content aluminium alloys, which open the gate for the application of anodising on cast aluminium components. This paper aims to investigate the influence of Sr modification as well as the post-treatment on corrosion resistance of oxide layer of low Si content cast Al alloys. In the present study, designed Al-Si alloys with 5.45 wt-% Si were studied by performing electrochemical impedance spectroscopy (EIS) in 3 wt-% NaCl solution. The morphology of Si particle was determined by controlling the level of Sr. The microstructure features were evaluated by optical microscopy and scanning electron microscopy (SEM). Furthermore, focus ion beam-SEM (FIB-SEM) equipped with energy-dispersive X-ray spectroscopy (EDXS) was applied to exam the corrosion morphology and the anodised layer with Si rich eutectic phases. The EIS study revealed that the corrosion resistance of the oxide layer on cast Al alloys can be significantly influenced by the morphology of Si particle and the post-treatment. It was found that the change of Si particle morphology from flake-like to fibrous by Sr addition can substantially improve the corrosion resistance of the oxide layer in the unsealed condition due to the formation of the more compacted oxide layer with less defects. Normally, the application of a sealing step such as the hydrothermal sealing can improve the corrosion protection of the oxide layer. However, in the current study, it was found the hydrothermal sealing step leads to a significant reduce of the corrosion protection due to the generation of cracks into the oxide layer, and the hydrothermal sealing step can counteract the improvement of the corrosion protection by Sr addition.

  • 29075.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Influence of Si and cooling rate on microstructure and mechanical properties of Al-Si-Mg cast alloys2015In: Proceedings of the 7th Symposium of Aluminium Surface Science and Technology, 2015Conference paper (Refereed)
    Abstract [en]

    This paper aims to investigate the effect of Si-content and microstructure on mechanical properties of Al-Si-Mg alloys with the purpose of to develop high strength cast aluminum alloys that are anodizable. The Si-content was 2.5, 3.5 and 5.5 wt% Si and both Sr-modified and unmodified conditions were used. The samples were produced using the gradient solidification furnace to generate a well-controlled microstructure. The resulting secondary dendrite arm spacing was 10µm and 20µm. The microstructural features were evaluated by employing SEM/EDS, and optical microscopy. Furthermore, CT-scan technology was used to provide a 3-D view of high density phases in the microstructure. The mechanical properties of these alloys were studied by means of tensile and hardness testing where the latter were performed on the macro- and micro-level. The results demonstrate clearly how the Si growth in the microstructure is restricted by increased cooling rate and modification and its role in strength development in Al-Si alloys. Additionally, the CT-scan visualized the morphology of intermetallics as well as supported in identifying the oxide layer growth as a result of the anodizing process.

  • 29076.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Influence of Si and cooling rate on microstructure and mechanical properties of Al–Si–Mg cast alloys2016In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 48, no 8, p. 861-869Article in journal (Refereed)
    Abstract [en]

    This paper aims to investigate the effect of Si-content and microstructure on mechanical properties of Al–Si–Mg alloys with thepurpose of to develop high-strength cast aluminum alloys that are anodizable. The Si-content was 2.5, 3.5 and 5.5wt% Si, andboth Sr-modified and unmodified conditions were used. The samples were produced using the gradient solidification furnaceto generate awell-controlled microstructure. The resulting secondary dendrite armspacingwas 10 and 20μm. Themicrostructuralfeatures were evaluated by employing SEM/EDS and optical microscopy. Furthermore, computed tomography (CT) scan technologywas used to provide a 3D view of high-density phases in the microstructure. The mechanical properties of these alloys werestudied by means of tensile and hardness testing where the latter was performed on the macrolevel and microlevel. The resultsdemonstrate clearly how the Si growth in the microstructure is restricted by increased cooling rate and modification and its rolein strength development in Al-Si alloys. Additionally, the CT scan visualized the morphology of intermetallics and supported inidentifying the oxide layer growth as a result of the anodizing process.

  • 29077.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Persson, Per O.Å.
    Linköpings universitet.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders E. W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    A study of formation and growth of the anodized surface layer on Al-Si casting alloys based on different analytical techniques2015Conference paper (Refereed)
  • 29078.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. SP-Technical Research Institute of Sweden.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. SP-Technical Research Institute of Sweden; University of Trento, Dept of Industrial Engineering.
    Persson, Per
    Thin Film Physics Division, Department of Physics, Chemistry and Biology, Linköping University.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    A study of formation and growth of the anodised surface layer on Al-Si casting alloys based on different analytical techniques2015Conference paper (Refereed)
    Abstract [en]

    One of the major limitations in the application of anodizing of aluminum casting alloys is the non-uniform thickness of the oxide layer. Previous researches have studied the formation of the oxide film during anodizing in detail. These investigations have mainly been limited to aluminum and wrought aluminum alloys, and only a few papers have given some insights about the formation of the oxide layer on cast aluminum alloys. The majority of cast aluminum alloys contains relatively higher amounts of Si and other elements (e.g. Cu and Fe) than wrought alloys. This paper aims to investigate the mechanisms of formation and growth of the anodized surface layer on Al-Si casting alloys by applying different analytical techniques such as optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray computer tomography (X-ray CT) scanning. Three different Al alloys with various Si content (2.4%, 3.5% and 5.5%) were investigated. Si morphological modification by Sr addition, as well as gradient solidification was used to vary the microstructural coarseness in a controlled manner to study the influence of these parameters on the growth of the oxide layer. The microstructure features of the anodized layer and the interface between matrix and the oxide layer were studied, employing optical microscopy (figure 1), and SEM/EDS (figure 2). X-Ray CT-scanning (figure 3) was used to examine the high density phases (Fe and Cu bearing phases) and also to give a 3-D view of the anodized oxide surface. Furthermore, TEM was used to examine the general filming behavior of anodized layer and the local effects associated with Si particles in the matrix.

    It was found that: (i) during anodizing, the oxide front grew around the Si particles and tends to engulf them; (ii) the oxide front grew inwards but did expand in other directions in the eutectic areas; (iii) a scalloped interface between substrate and oxide indicated different anodizing rates in dendrites and eutectic phases. The oxide front was moving faster in the primary dendrite Al-phase than in the eutectic, and the growth rate was particularly slow in larger eutectic areas; (iv) different anodizing rates in dendrite and eutectic phases resulted in thinner layers in specimens with lower SDAS (secondary dendrite arm spacing); and (v) a more uniform layer thickness in Sr-modified specimens illustrates that oxide growth speed was faster in modified eutectic phase. However, diffusion of Si or long distance between Si particles after modification could even results in the adverse situation with a bad anodized surface appearance. 

  • 29079.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Santos, Jorge
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Influence of Mg content on the fatigue behaviour of Al-Si-Mg alloys by rheocasting processManuscript (preprint) (Other academic)
  • 29080.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    A study of anodising behaviour of Al-Si components produced by rheocasting2019In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 285, p. 39-44Article in journal (Refereed)
    Abstract [en]

    This paper aims to investigate the anodising behaviour of Al-Si components produced by rheocasting, to understand the effect of the surface liquid segregation (SLS) on the anodising response. The material investigated was EN AC 42000 Al-alloy with an addition of 150 ppm Sr. The component was rheocast and conventionally liquid cast for benchmarking. The RheoMetalTM process was used to prepare slurry and subsequently cast using a vertical pressure die casting machine. Prior to anodising, mechanical grinding was used as pre-treatment method for selected samples as comparison with components in the as-cast state. Anodising was performed on the components using a constant controlled voltage at 25 V, in 1 M H2SO4, at room temperature. The duration of anodising was varied from 30 mins to 120 mins to examine the relationship between oxide layer thickness and the anodising time. The oxide layer was investigated and characterised. The results demonstrated that the presence of the SLS layer, which was enriched with alloying elements, had a significant influence on the anodising behaviour of the cast component. The oxide layer thickness of the components produced by rheocasting and fully liquid casting was measured and compared. The relations between the oxide layer thickness and anodising time, as well as the casting methods are presented and discussed in this paper.

  • 29081.
    Zhu, Baiwei
    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.
    Persson, Per O.Å:
    Thin Film Physics Division, Department of Physics, Chemistry and Biology, Linköping University.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. SP-Technical Research Institute of Sweden.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. SP-Technical Research Institute of Sweden.
    A study of formation and growth of the anodised surface layer on cast Al-Si alloys based on different analytical techniques2016In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 101, p. 254-262Article in journal (Refereed)
    Abstract [en]

    This paper aims to investigate the mechanisms of formation and growth of the anodised surface layer on Al-Si castings by applying different analytical techniques such as optical microscopy, scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and X-ray computer tomography (X-ray CT) scanning. Three different Al alloys with various Si content (2.43%, 3.53% and 5.45%) were investigated. Si particle morphological modification by Sr addition, as well as directional solidification, was used to vary the microstructural coarseness in a controlled manner to study the influence of these parameters on the growth behaviour of the oxide layer. This study observed residual unanodised Al phases trapped beneath or between Si particles in the oxide layer. It was found, depending on the geometry and morphology of Si particles, that Al can be shielded by Si particles and prevented from oxidising.

  • 29082.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Hardness and corrosion behaviour of anodised Al-Si produced by rheocasting2019In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 173, article id 107764Article in journal (Refereed)
    Abstract [en]

    The anodised layer of Al-Si alloys produced by rheocasting was studied and compared to anodised traditional liquid casting in this paper. The anodising was performed in 1.0 M H2SO4 solution at room temperature on the as-cast substrates, and anodising voltage and time were optimised as process parameters. This study focuses on understanding the effect of the surface liquid segregation (SLS) layer by rheocasting on the hardness and corrosion protection of the oxide layer. The hardness depends on the anodising parameters and varies along the oxide thickness. The corrosion protection given by the oxide layer was evaluated by electrochemical impedance spectroscopy (EIS) in 3 wt-% NaCl solution, and the results revealed that the longitudinal macrosegregation influences the corrosion protection, with the near-to-vent region showing lower corrosion protection due to a higher eutectic fraction. A comparison between liquid and rheocast samples indicated that the presence of SLS layer by the transverse macrosegregation does not have a significant impact on the corrosion resistance of the oxide layer. Moreover, it was found that an increase of the oxide layer thickness by longer anodising time or higher applied voltage decreases both the hardness and corrosion resistance of the oxide layer.

  • 29083.
    Zhu, Baiwei
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Influence of Fe-rich intermetallics and their segregation on anodising properties of Al-Si-Mg rheocast alloysManuscript (preprint) (Other academic)
  • 29084.
    Zhu, Li
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Xu, Dan
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Marketing Strategic Change in Expansionof Disneyland: Cases Study of Disneyland's Overseas Expansion in Shanghai2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Problem: The international theme park industry is growing but is also facing a series of bottleneck problems. Disneyland as one of the most famous theme parks, is trying to expand its kingdom to China. With the success and failure of the three previous oversea Disneyland, marketing strategic changes are becoming crucial and critical in the expansion of theme parks. Recognizing the elements that lead to strategic changes and generate proper strategies are preconditions of any successful expansion of theme parks, especially to Shanghai Disneyland

    Purpose: The purpose of this thesis is to identify the main factors affecting Shanghai Disneyland’s marketing strategic changes. Through the empirical study, we are going to describe the strategic changes made in all oversea Disneyland and try to identify “the main drivers and motivations of strategic change for the future Shanghai Disneyland”.

    Method: In this thesis we have adopted the case study approach. Disneyland is one of the most famous theme parks over the world. The data was collected with the help of open ended interviews from high-level managers to ordinary employees in different Disneyland.

    Results: Disneyland is a successful example in its efforts to expand overseas. However, Paris Disneyland and Hong Kong Disneyland are not as profitable as expected. In the year 2012, Shanghai Disneyland is going to open. Based on the analysis of strategic changes Disney made in Tokyo, Paris, Hong Kong and Shanghai, authors will get the main drivers and motivations for these strategic changes.

  • 29085.
    Zhu, Qiyao
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Hu, Yan
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Guo, Wentao
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Mobile learning in higher education: Students’ acceptance of mobile learning in three top Chinese universities2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Introduction: Along with the swift spread of 3G and wireless network, wireless technologies are applied in many areas, especially in education. The advent of mobile learning overcomes several limitations and barriers of traditional classroom education. As for higher education in China, mobile learning is in its infancy stage. Understanding end-users’ acceptance of mobile learning is crucial, because new technological advances cannot enhance performance if they are not accepted by end-users. This study focuses on three top Chinese universities and answers the following research questions:

    1. How do students perceive mobile devices as a learning tool incorporated in class and what are their attitudes towards mobile learning?
    2. What are the motivational factors that affect students’ acceptance of mobile learning?

    Purpose: The purpose of this study is to test the proposed Technology Acceptance Model (TAM) in explaining students’ acceptance in three top Chinese universities. The goal of this work is to enhance the understanding of user acceptance of incorporating learning into mobile device inside and outside classes.

    Method: A deductive, theory-testing approach was used in this study. Eleven hypotheses were built based on a literature review and on the proposed TAM model, and were tested using primary data and literature review. Primary data was gathered via semi-structured interviews and questionnaires. The data collected through the questionnaire was analysed by Structural Equation Modeling.

    Conclusion: Through testing the proposed model, the authors found that students are positive towards mobile learning but they do not have a strong willingness to adopt it. The proposed TAM model can improve the understanding of students’ motivation by suggesting what factors are the most important in enhancing students acceptance of mobile learning.

  • 29086.
    Ziegenhagen, Emma
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Buensoz, Emma
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Orsaker och konsekvenser av byggfel2013Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 29087. Ziegert, K
    et al.
    Fridlund, Bengt
    Högskolan i Halmstad.
    Conceptions of life situation among next-of-kin of haemodialysis patients2001In: Journal of Nursing Management, ISSN 0966-0429, E-ISSN 1365-2834, Vol. 9, no 4, p. 231-239Article in journal (Refereed)
  • 29088. Ziegert, K
    et al.
    Fridlund, Bengt
    Växjö universitet.
    Lidell, E
    Health in everyday life among spouses of haemodialysis patients: a content analysis2006In: Scandinavian Journal of Caring Sciences, ISSN 0283-9318, E-ISSN 1471-6712, Vol. 20, no 2, p. 223-228Article in journal (Refereed)
  • 29089. Ziegert, K
    et al.
    Fridlund, Bengt
    Växjö universitet.
    Lidell, E
    Professional support for next of kin of patients receiving chronic haemodialysis treatment: a content analysis study of nursing documentation2007In: Journal of Clinical Nursing, ISSN 0962-1067, E-ISSN 1365-2702, Vol. 16, no 2, p. 353-361Article in journal (Refereed)
  • 29090. Ziegert, K
    et al.
    Högstedt, B
    Fridlund, Bengt
    Lunds universitet.
    Lidell, E
    Time distribution factors of hospital and home care among chronic haemodialysis patients2004In: Journal of Renal Care (EDTNA/ERCA), ISSN 1755-6678, Vol. 16, no 1, p. 19-22Article in journal (Refereed)
  • 29091. Ziegert, Kristina
    et al.
    Fridlund, Bengt
    Jönköping University, School of Health Science, HHJ, Dep. of Nursing Science. Jönköping University, School of Health Science, HHJ. Quality improvements, innovations and leadership in health care and social work.
    Lidell, Evy
    Time for dialysis as time to live: experiences of time in everyday life of the Swedish next of kin of hemodialysis patients2009In: Nursing and Health Sciences, ISSN 1441-0745, E-ISSN 1442-2018, Vol. 11, no 1, p. 45-50Article in journal (Refereed)
  • 29092.
    Ziehensack, Jonas
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Stina, Tommila
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Bug Appétit!: A qualitative research of purchase intentions towards insect-based products.2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: A significant increase in the global food demand is expected to occur in the near future. Since the currently implied food system will not be able to meet this demand without impacting the environment negatively, it is crucial to consider alternative ways of producing food. Entomophagy thereby presents an approach that could be deployed to meet the future demand in an environmental and sustainable way. However, whereas multiple studies investigate consumers’ acceptance of insect-based products, little is known about their purchase intentions.

    Purpose: The purpose of this study is to explore the underlying factors affecting Swedish university-attending Generation Y consumers’ purchase intentions towards insect-based products. In order to fulfill the purpose of this study, two research questions have been developed. Thereby, the Theory of Planned Behavior was chosen as a theoretical framework.

    Method: The research philosophy of this study adopted elements of both constructionism and interpretivism. Further, this study applied an abductive approach and a qualitative research design with an exploratory purpose. A total of three focus groups were conducted in order to explore purchase intentions towards insect-based products. In addition, a taste test was incorporated in each focus group to explore the participants’ reactions when given the opportunity to try an insect-based product. To adequately reach the selected target population, a combination of a self-selection sampling technique and a convenience sampling technique was employed. Lastly, a content analysis following a directed approach was applied in order to properly analyze the collected data.

    Conclusion: The empirical findings of this study suggest that eleven factors are contributing to the target populations’ purchase intentions towards insect-based products. Thereby, ten of these factors are connected to the components of attitude, subjective norm, and perceived behavioral control of the theoretical framework whereas the remaining factor was not categorized within these components. Regarding the conducted taste test, it was found that the large majority of the participants were willing to try. Further, the taste test showed that all participants followed their initial intentions.

  • 29093.
    Zielinski, Ingar M.
    et al.
    Behavioural Science Institute, Nijmegen, the Netherlands.
    Green, Dido
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. CHILD. Department of Sport and Health Science, Oxford Brookes University, Oxford, United Kingdom.
    Rudisch, Julian
    Department of Sport and Health Science, Oxford Brookes University, Oxford, United Kingdom.
    Jongsma, Marijtje L. A.
    Behavioural Science Institute, Nijmegen, the Netherlands.
    Aarts, Pauline B. M.
    Department of Pediatric Rehabilitation, Sint Maartenskliniek, Nijmegen, the Netherlands.
    Steenbergen, Bert
    Behavioural Science Institute, Nijmegen, the Netherlands.
    The relation between mirror movements and non-use of the affected hand in children with unilateral cerebral palsy2017In: Developmental Medicine & Child Neurology, ISSN 0012-1622, E-ISSN 1469-8749, Vol. 59, no 2, p. 152-159Article in journal (Refereed)
    Abstract [en]

    Aim:

    In children with unilateral cerebral palsy (CP), it is widely believed that mirror movements contribute to non-use of the affected hand despite preserved capacity, a phenomenon referred to as developmental disregard. We aimed to test whether mirror movements are related to developmental disregard, and to clarify the relation between mirror movements and bimanual function.

    Method:

    A repetitive squeezing task simultaneously measuring both hands' grip-forces was developed to assess mirror movements by using maximum cross-correlation coefficient (CCCmax) as well as strength measures (MMstrength). Developmental disregard, bimanual performance, and capacity were assessed using a validated video-observation method. Twenty-one children with unilateral CP participated (Median age 10y 7mo, interquartile range [IQR] 10y 1mo–12y 9mo). Outcome measures of mirror movements were correlated to developmental disregard, bimanual performance, and capacity scores using Spearman's correlations (significance level: α<0.05).

    Results:

    Mirror movements were not related to developmental disregard. However, enhanced mirror movements in the less-affected hand were related to reduced performance (CCCmax: ρ=−0.526, p=0.007; MMstrength: ρ=−0.750, p<0.001) and capacity (CCCmax: ρ=−0.410, p=0.033; MMstrength: ρ=−0.679, p<0.001). These relations were only moderate (performance:MMstrength: ρ=−0.504, p=0.010), low (capacity: MMstrength: ρ=−0.470, p=0.016) or absent for mirror movements in the affected hand. Additionally, seven children showed stronger movements in their less-affected hands when actually being asked to move their affected hand.

    Interpretation:

    These findings show no relation between mirror movements and developmental disregard, but support an association between mirror movements and bimanual function.

  • 29094.
    Ziemba, Alexander
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Centre of Logistics and Supply Chain Management (CeLS).
    Prevolnik, Fabian
    Jönköping University, Jönköping International Business School, JIBS, Centre of Logistics and Supply Chain Management (CeLS).
    The reverse logistics of electric vehicle batteries: Challenges encountered by 3PLs and recyclers2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background:          The growing number of electric vehicles gives rise to a whole new reverse supply chain. Once the electric vehicle batteries reach their end-of-life, societal and governmental pressure forces automotive manufacturers to set up a network for disposing the hazardous batteries. Although, the volumes of returned batteries remain low, volumes will increase in upcoming years. Current networks and processes related to the return flow of electric vehicle batteries are not well established, nor well defined. Thus, creating an urgency to develop efficient collection networks.

     

    Purpose:                  The purpose of this study is to investigate how reverse logistics networks are currently set up and to provide an overview of how the different actors and processes are connected. In addition, this thesis aims to identify challenges encountered by logistics providers and recyclers. By doing so, we hope to contribute to the research gap of which factors that constitutes a bottleneck for further development of the reverse logistics chain of electric vehicle batteries.

     

    Method:                  The thesis conducts an interview study and is qualitative in nature. Semi-structured interviews generated empirical data, which was analysed through cross-case analysis incorporating a thematic analysis. Through this analysis we were able to achieve new theoretical understandings in connection to institutional theory.

     

    Conclusion:             Through empirical findings a detailed framework of the reverse logistics chain of EVBs is portrayed. Furthermore, different challenges span over the processes illustrated in the framework. This presents an overview which is not found in current literature and extends current research on this topic.

  • 29095.
    Ziemke, Linnea
    et al.
    Jönköping University, School of Education and Communication.
    Viström, Carolina
    Jönköping University, School of Education and Communication.
    Vad krävs för att elever ska utveckla läs- och skrivkunskaper?: En litteraturstudie om inlärningsmetoder och lärarens betydelse2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Avsikten med denna litteraturstudie är att undersöka vad forskning menar krävs för att elever i årskurs f-3 ska utveckla läs- och skrivkunskaper. I studien beskrivs de överordnade läsinlärningsmetoderna phonics och whole language med arbetssätten Wittingmetoden och LTG. Vidare beskrivs undervisningen och lärarens betydelse för elevers läs- och skrivinlärning. Det framkommer i resultatet att läraren har en betydande roll för elevers läs- och skrivinlärning där undervisningen behöver vara strukturerad och organiserad. Undervisningen behöver innehålla viktiga grundläggande delar och dimensioner såsom fonologisk medvetenhet, ordavkodning, läsflyt, läsförståelse och läsintresse för att elever ska utvecklas i sin läsning. Det framgår även att tidiga insatser är av stor betydelse för att elever ska tillägna sig läs- och skrivkunskaper. Informationssökning har genomförts i olika databaser som till exempel ERIC och SwePub för att finna vetenskapligt material som valdes ut för att besvara litteraturstudiens syfte och frågeställningar. Materialet består av tidskriftsartiklar, doktorsavhandlingar, en licentiatavhandling och ett konferensbidrag som har analyserats och sammanställts och ligger till grund för denna litteraturstudie.

  • 29096.
    Ziemke, Linnéa Anna Matilda
    Jönköping University, School of Education and Communication.
    Läsinlärning i årskurs 1: En kvalitativ undersökning om lärares syn på läsinlärningsmetoder och läsundervisnin2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to contribute with knowledge about teachers’ views on their work with literacy learning. The research questions are: How do the teachers describe that they conduct reading lessons? What literacy learning methods do these teachers use in class? How do the teachers describe their own importance as a teacher for the literacy learning of the pupils? This study is based on a socio-cultural perspective on learning and reflects the ideas of Vygotskij on learning and development. Qualitative semi-structured interviews were conducted with four teachers currently active in grade 1. The results show that the teachers combine several different methods in their literacy instruction with the purpose to give the pupils both phonological reading practice and whole words trainings. The instructions have elements such as learning the alphabet, conversations, reading, writing and, in various ways, work based on a textbook. The results show that the teachers need to be knowledgeable and positive role models in order to motivate their pupils to read. Furthermore, the teachers must be able to provide their pupils with challenges adapted to their reading competence in order to give all pupils the right conditions for development.

  • 29097.
    Zienau, Charlotta
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    What Determines a Region’s Capacity to Integrate Refugees?: A Study of the Swedish Municipalities’ Characteristics and their Relationship with Integration2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The current refugee crisis has affected many European countries, not least Sweden with the highest number of asylum applications per capita. The crisis has brought an intense discussion on how refugees should be allocated, both across the EU member states and on a sub-national level, and it has undoubtedly put current dispersion policies on trial. Through a study of Sweden’s 290 municipalities, this thesis aims to identify certain characteristics of a host region that facilitates integration, in order to see whether current dispersion policies are optimal, and if not, how they could be altered. Through simple and multiple OLS regressions certain characteristics have shown a clear relationship with integration (positive or negative), while some have been deemed irrelevant. As dispersion policies suggest, a larger population seems to facilitate integration. Also labor market conditions are as expected important, but it seems that the situation for youths is more relevant than the general condition. Finally, it seems as though an ethnically fractionalized population facilitates integration, although the process is aggravated as the refugee influx increases. As surprisingly little research has been conducted on this field, this thesis has only laid the foundation for the topic and further research is necessary. Still, the research has induced some doubts regarding the optimality of current dispersion policies, and this thesis suggests that additional factors should be taken into consideration when dispersion policies are elaborated.

  • 29098.
    Zijlstra, Peter
    et al.
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Visser, Christiaan
    Jönköping University, Jönköping International Business School, JIBS, Business Informatics.
    Developing Business Models in the Video Game Industry: An evaluation to strategic choices made by small and medium-sized development studios2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Digitalization has given rise to new opportunities for small and medium-sized video game development studios. No longer bound by physical products and creative restrains, the de-veloper has been empowered with independency. This qualitative study is aimed to under-stand how a development studio develops their business model and how underlying strate-gy is formulated. Additionally we evaluate the degree of innovativeness of the business model in terms of radical and incremental innovation according to Damanpour (1991). To achieve this we present a comprehensive literature review as to gain a more theoretical un-derstanding of industry mechanics and to be able to comprehend reasoning behind existing business models. We structure the dynamics of the business model by analyzing nine busi-ness model aspects as suggested by Osterwalder, Pigneur and Clark (2010). Following our theoretical framework we gain practical input from four separate case studies. An interpret-ative research method is used to gain better understanding of reasoning and choices made. We interpret our findings following a narrative approach which shows that the digitaliza-tion has preluded a paradigm shift in the sense that development studios have started to adopt activities otherwise performed by key partners. As barriers dissipate small and me-dium-sized development studios try to make sense of the current industry, but struggle in doing so. Having to reinvent themselves we conclude that a focus towards creating thicker customer relationships is considered and the idea of seeing games as a service is acknowl-edged to depict the future of the industry. The conclusions of this study contribute to both academic science and industry practice.

  • 29099.
    Zimmermann, Alfred
    et al.
    Reutlingen University, Germany.
    Jugel, Dierk
    Reutlingen University, Germany.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics. University of Rostock, Germany.
    Schmidt, Rainer
    Munich University, Germany.
    Bogner, Justus
    Reutlingen University, Germany.
    Kehrer, Stefan
    Reutlingen University, Germany.
    Multi-Perspective Decision Management for Digitization Architecture and Governance2016In: 2016 IEEE 20th International Enterprise Distributed Object Computing Workshop (EDOCW), IEEE, 2016, p. 1-9Conference paper (Refereed)
    Abstract [en]

    The Internet of Things, Enterprise Social Networks, Adaptive Case Management, Mobility Systems, Analytics for Big Data, and Cloud environments are emerging to support smart connected i.e. digital products and services and the digital transformation. Biological metaphors of living and adaptable ecosystems provide the logical foundation for selfoptimizing and resilient run-time environments for intelligent business services and related distributed information systems with service-oriented digitization architectures. We are investigating mechanisms for flexible adaptation and evolution of information systems with digital architecture in the context of the ongoing digital transformation. Our aim is to support flexibility and agile transformation for both business and related information systems through adaptation and dynamical evolution of their digital architectures. The present research paper investigates mechanisms of decision analytics for digitization architectures, putting a spotlight to Internet of Things architectures, by extending original enterprise architecture reference models with digitization architectures and their multiperspective architectural decision management.

  • 29100.
    Zimmermann, Alfred
    et al.
    Reutlingen University, Germany.
    Jugel, Dierk
    Reutlingen University and University of Rostock, Germany.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics. University of Rostock, Germany.
    Schmidt, Rainer
    Munich University, Germany.
    Schweda, Christian M.
    Reutlingen University, Germany.
    Möhring, Michael
    Munich University, Germany.
    Architectural Decision Management for Digital Transformation of Products and Services2016In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, Vol. 6, p. 31-53Article in journal (Refereed)
    Abstract [en]

    The digitization of our society changes the way we live, work, learn, communicate, and collaborate. The Internet of Things, Enterprise Social Networks, Adaptive Case Management, Mobility systems, Analytics for Big Data, and Cloud services environments are emerging to support smart connected products and services and the digital transformation. Biological metaphors of living and adaptable ecosystems provide the logical foundation for self-optimizing and resilient run-time environments for intelligent business services and service-oriented enterprise architectures. Our aim is to support flexibility and agile transformations for both business domains and related information technology. The present research paper investigates mechanisms for decision analytics in the context of multi-perspective explorations of enterprise services and their digital enterprise architectures by extending original architecture reference models with state of art elements for agile architectural engineering for the digitization and collaborative architectural decision support. The paper’s context focuses on digital transformations of business and IT and integrates fundamental mappings between adaptable digital enterprise architectures and service-oriented information systems. We are putting a spotlight on the example domain – Internet of Things.

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