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- Edstorp, Marcus, 1980-
(författare)
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Weld Pool Simulations
- 2008
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This investigation is devoted to the study of welding and its effect on the workpiece, focusing on the thermo and fluid dynamical phenomena occuring during a autogenous or nonautogenous arc fusion welding process. Its aim is to simulate the behaviour of the weld pool and analyze the consequence of the solid-liquid phase change, thus obtaining a methodology for predicting the appearance of weld defects related to solidification and cooling. In order to accomplish this, we solve equations governing a number of continuum mechanical and electromagnetical quantities, as well as consider the motion of the freely moving boundary of the weld pool. Since the state of these quantities is strongly influenced by phenomena such as arc and droplet impingement, non-isothermal phase change, surface tension, Marangoni forces and Lorentz forces, much effort is necessarily devoted to the modelling of the corresponding fluxes and sources, as well as to the implementation of computationally efficient techniques for simulating the geometrical deformation of the workpiece, which in our setting is entirely determined by the motion of the weld pool surface.Common to all arc fusion welding processes is the employment of a welding arc. Many techniques rely on the arc to clean and shield the workpiece during the process, however in this study we consider it to be its main purpose to cause the local increase of thermal energy that is required for the establishment of the weld pool, and also to exert the mechanical forces that provoke the subsequent fluid flow which enhances heat transfer and facilitates weld penetration. The physics of the welding arc itself is quite intricate, and although the modelling of the arc is not the prime objective of this research project, we conclude that arc forces act on the pool surface, and that the investigation of the arc behaviour is important insofar that it provides input to the pool model and thus enables a more accurate prediction of the quality of the weldment that is created once the pool has solidified
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| 2. |
- Gurdal, Sevtap, 1976-
(författare)
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Parenting Across Cultures : Parental attributions, attitudes and behaviour
- 2013
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Previously studies in parenting have mainly been conducted in Western countries. Not uncommonly results from such studies are used to describe general, worldwide trends. In an attempt to make the field of parenting research more culturally heterogeneous, an international research project, Parenting Across Cultures, was started. The project includes nine participant countries (China, Colombia, Italy, Jordan, Kenya, Philippines, Sweden, Thailand, and USA) and its purpose is to examine parenting across cultures. This thesis is based on reports from parent participants. The aim of Study I was to investigate mothers’ and fathers’ (77 participants from each group) attributions and attitudes in Sweden. The results revealed that Swedish parents are more polarized in their attitudes than in their attributions, they think more alike for parenting attitudes and there was greater variability for parenting attributions, particularly regarding uncontrollable success, as opposed to attributions regarding adult- or child-controlled failure. Regarding attitudes, mothers and fathers reported more progressive than authoritarian attitudes. Fathers reported higher adult-controlled failure and child-controlled failure attributions than mothers. In Study II the aim was to assess whether mothers’ and fathers’ self-reports of acceptance-rejection, warmth, and hostility/rejection/neglect of their children differ in the nine countries. A total of 1996 parents (998 mothers and 998 fathers) participated in the study. Mothers and fathers reported high acceptance and warmth and low rejection and hostility/rejection/neglect (HRN) of their children in all nine countries. Despite the overwhelmingly high levels of acceptance and low levels of rejection across all countries, and despite our use of statistical controls for parental age, education, social desirability, and child age, some systematic differences between countries emerged. In summary, parents in the studies report higher similarity about parenting in some cases, for example concerning acceptance and warmth and hostility/rejection/neglect, but lower in others, such as the Swedish parents’ reports about attributions.
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| 4. |
- Kajonius, Petri, 1974-
(författare)
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The Impact of Care Process on Satisfaction with Elderly Care
- 2014
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This licentiate thesis is based on the growing interest in Swedish elderly care. The aim of this thesis is to investigate what generates satisfaction with elderly care among older persons. The dominant ideology in both privately and publically run elderly care is individualized care, also called person-centered care, which holds the older person’s satisfaction as one of the main quality indicators. The proportion of older people is increasing and to maintain high levels of satisfaction with elderly care will require more knowledge. Data from the National Board of Health and Welfare’s (2012) nationwide survey on seniors’ experiences with elderly care was collected. Statistical analyses of this sample formed the basis for the results of the thesis and were reported in two papers. Study I used Donabedian’s (1988) model of quality of care in terms of structure, process, and outcome, and all municipal units in Sweden were included (N = 324). The results showed that structural variables (i.e. budget, staff, and training level) have minimal or no relationships with older persons’ satisfaction with care, while process variables (i.e. experiences of respect, information, and influence) have strong relationships with satisfaction with care. Study II made use of the long-standing person versus situation- model in social psychology, and was analyzed on an individual level (N = 95,000). The results showed that care process factors (i.e. experiences of treatment, safeness, staff- and time-availability) had a stronger relationship, than individual factors (i.e. health, anxiety, and loneliness) with satisfaction with care. The results also showed that older persons with home care generally felt better treated than older persons in nursing homes, but also felt less safe. Mediational analyses, based on this comprehensive elderly data, suggest that the individual aging condition of loneliness can be countered by providing safeness and treatment, resulting in high satisfaction with care. In conclusion, satisfaction with elderly care in Sweden today can largely be explained from a psychological perspective by the older persons’ perception of the care process, not by the amount of structural resources or the conditions of the aging persons. These findings could help facilitate the future quality development in municipalities and care organizations.
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