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  • Adolfsson, Matilda
    Halmstad University, School of Business, Engineering and Science.
    Vibrationer och engesvängningar i Alfdex separator2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to create a greater understanding of what happens inAlfdex’s separator in terms of natural frequencies, also called resonances. Try in asystematic way to find out where the problem is and produce a possible solutionto the problem. To achieve this smoothly, vibration measurements were made onthree different models with two variants, a total of six different variants. Themeasurements made with an electric shaker were set to run a sweep of 2-500Hz,which means that it increases the frequency from 20-500Hz with a constantacceleration of 2G. The measurement was first made on these six variants and, onthe basis of the results, it has been possible to compare with the modificationsmade.As the first modification, the disks in the separator were glued together to see ifthey made any difference from the previous result. As the next test spacers wereprinted out of the 3D-printer, that would replace the existing springs in theseparator, to aww what happens if we do not have any springs. There was also atest where the top of the separator the so-called house, was cut into a larger holeso as to see how the disks hold a constant amplitude relative to each other, whichmeans that the disks are not exposed to any natural frequencies. The springs werefilmed to see how they act and move, where it is clear that there are naturalfrequencies in the springs.Based on these tests, it can be concluded that the disk in question are not aproblem. The problem instead has its foundation in the springs that carry the diskstack throughout the separator, resonances in these give a great influence in theentire contents of the separator.

  • Fridehjelm, Maja
    et al.
    Halmstad University, School of Health and Welfare.
    Broström, Linn
    Halmstad University, School of Health and Welfare.
    Olsson, Ida
    Halmstad University, School of Health and Welfare.
    ”Jag känner mig inte bra nog”: En kvalitativ studie om ungdomars upplevelser av hur sociala medier påverkar deras hälsa2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Among adolescents aged 16-18 in Sweden, mental illness has increased in recent years and is expected to continue to increase. Sweden is one of the most digitized countries, where 99 % of Swedish teenagers have access to and are estimated to use social media from two to over six hours daily. Previous research in the field demonstrates a connection between the use of social media and the emergence of mental illness. The purpose of this study was to highlight what experiences adolescents have about how social media and the prevailing norms of health portrayed on social media affect their self-perceived mental health. The study has a social constructivist basis with an abductive approach. In the study, four focus group interviews with 17 informants were carried out, which were then analyzed using a qualitative content analysis. The result showed that the adolescents feel that social media primarily have a negative impact on their self-perceived mental health since they are afraid of missing things while also comparing themselves with others on social media. The adolescents also experience that their self-perceived mental health is mainly negatively affected by the prevailing norms of health that flourish on social media, since norms about body ideals and lifestyles primarily lead to feelings of anxiety, demands, pressure, disappointment, failure and inadequacy. The study's conclusion is that the adolescents are mainly affected negatively by what they see on social media and the prevailing norms of health that are portrayed on social media related to their self-perceived mental health.