The aim of this study was to investigate the relation between parental mental well-being and parenting skills and whether this relationship differs based on the child's temperament. Parenting...Show moreThe aim of this study was to investigate the relation between parental mental well-being and parenting skills and whether this relationship differs based on the child's temperament. Parenting skills are crucial factors in a child's emotional, cognitive, social, and behavioral development. Data were collected from 20 parents of young children (3 - 5 years old). Parenting skills were assessed using self-report questionnaires regarding confidence in parenting, reflective capacity, and parental sensitivity. The child's temperament was also assessed through questionnaires filled out by the parents. All multiple regressions were non-significant, and the relationships between parental mental well-being and parenting skills were not moderated by the child's temperament. This means that parental mental well-being and the child's temperament were not sufficiently predictive of parental self-confidence, reflective capacity, and parental sensitivity in parenting. By examining the correlations, a moderate positive relationship was found between parental mental well-being and their confidence in parenting. Parents with higher mental well-being had more confidence in their parenting. Parental mental well-being was negatively associated with their reflective capacity, indicating that parents with lower mental well-being displayed higher levels of reflective capacity. A moderate positive relationship was found between the child's temperament and parental sensitivity, suggesting that parents of children with a more challenging temperament were generally more sensitive in their parenting.Show less
The intergalactic medium (IGM) contains most of the baryonic matter of the Universe and serves as a suitable environment for probing the thermal history of the Universe. The crucial moment in IGM...Show moreThe intergalactic medium (IGM) contains most of the baryonic matter of the Universe and serves as a suitable environment for probing the thermal history of the Universe. The crucial moment in IGM evolution is the Epoch of Reionization, corresponding to the transition from neutral to ionized IGM. However, due to the observational limitations, this period is still not well understood. In this thesis, we focus on constraining IGM thermal history by using Lyman-alpha forests data. This method is applicable in a wide range of temperatures, densities, and ionization fractions of cosmic gas at z about 2 − 5. Observations show that the longitudinal flux power spectrum of the Lyman-α forest exhibits a cut-off at small scales. This phenomenon is caused by thermal Doppler broadening, peculiar velocities along the line of sight (LOS), Hydrogen pressure smoothing, and warm dark matter. The first two effects act only along LOS, while the last two affect all spatial directions. To separate the one-dimensional and three-dimensional effects, we used the method of close quasar pairs, which is based on studying the correlations between Lyman-alpha forests of close quasar pairs. We used the Kolmogorov-Smirnov test to analyze the differences between distributions of phase difference, which characterizes correlations between Lyman-alpha forests. The calculations were performed for various thermal histories, parameters characterizing IGM, LOS separations, and wavenumbers, and accounting for different effects (Doppler broadening and peculiar velocities). Our results indicate that this method can distinguish various thermal histories regardless of the IGM thermal state and one-dimensional effects. Moreover, at separations of the order of pressure broadening, there is a prominent feature caused by different influences of pressure smoothing at large and small scales. In addition, this simple and powerful approach has the potential to distinguish scenarios with warm dark matter.Show less
Objective. To determine the effectiveness of a rehabilitation program including physical exercise, in improving cognition, participation, and coping in patients with a subarachnoid hemorrhage (SAH)...Show moreObjective. To determine the effectiveness of a rehabilitation program including physical exercise, in improving cognition, participation, and coping in patients with a subarachnoid hemorrhage (SAH). Secondary, it was aimed to identify the role of clinical characteristics in the effectiveness of the rehabilitation program. Methods. A longitudinal pilot intervention study was performed, with measurements before the start (T0), after three months (T1), and after six months (T2). Cognition was measured with the Montreal Cognitive Assessment, participation with the Impact on Participation and Autonomy questionnaire, and coping with the Utrecht Proactive Coping Competence Scale. Generalized Estimating Equation analyses were performed. Results. A total of 19 patients with SAH participated; 13 in the intervention group and 6 in the control group. For the intervention group, cognition improved between T0 and T2 and between T1 and T2. Participation declined between T0 and T1, but improved between T1 and T2. Proactive coping declined between T0 and T2 and between T1 and T2. Cognition of the control group did not change, but participation improved between T0 and T1 and proactive coping declined between T0 and T1. There was no significant difference between the control and intervention groups in improvements in cognition between T0 and T1 (p = 0.090). However, there was a significant difference between the control and intervention groups in changes in participation between T0 and T1 (p = 0.001) and in changes in coping between T0 and T1 (p < 0.001). The location of SAH played a role in the differences in participation, but not in cognition and coping. For treatment type and time since SAH, no significant effects were found. Conclusion. There was no effect of the rehabilitation program on cognition. The control group had a better participation level after three months and the intervention group worsened. The intervention group had a stable coping style after three months, whereas the control group declined in the use of proactive coping. Only the characteristic location of the aneurysm played a role in the participation level after three months, but not in cognition or coping. The other characteristics did not play a role in the changes. This study indicates that some long-term complaints can improve after the rehabilitation program, but more research is needed.Show less
In this thesis we present an experimental realisation of a double loop type Magnetic Paul Trap. We show that a microgram heavy NdFeB permanent magnet can stably be levitated for hours at room...Show moreIn this thesis we present an experimental realisation of a double loop type Magnetic Paul Trap. We show that a microgram heavy NdFeB permanent magnet can stably be levitated for hours at room temperature in this trap. Magnetic levitation of a magnetized particle is theoretically possible with this trap by generating opposed alternating magnetic fields. We show the fabrication of a printed circuit structure capable of producing these fields, as well as the engineering behind the realisation of the trap. Both by optical and magnetic readout we characterize the motion of the trapped magnet and show that its center of mass motion frequencies $\omega_z = 2\omega_{x,y} \approx 20Hz$. We characterize the damping on these modes and find that at low pressure the quality factor is strongly limited (to $Q \approx 90$) by coupling to the environment through generation of Eddy currents.Show less
It has been demonstrated that exploring a new environment promotes memory in young adults. Animal studies propose that the enhancement of memory in novel settings is linked to hippocampal dopamine....Show moreIt has been demonstrated that exploring a new environment promotes memory in young adults. Animal studies propose that the enhancement of memory in novel settings is linked to hippocampal dopamine. While the dopaminergic system undergoes changes across the lifespan, little is known about the effects of novelty on memory throughout different life stages. This research contributes to the understanding of the effects of novelty in older adults. The participants (n=14) explored both novel and previously familiarised virtual environments to assess the influence of spatial novelty on declarative memory. Subsequently, participants were presented with a word list to memorise, and their memory performance was evaluated through both immediate and delayed recall. Our results indicate superior immediate recall compared to delayed recall, with no evidence for an effect of novelty. We found no difference in spontaneous eye blinking rate following exposure to a novel or familiar environment. Furthermore, a negative correlation was found between spontaneous eye blinking rate and memory recall. Finally, this sample showed that participants had a slightly better performance on day two compared to day three, especially when they had lower expectations. This suggests that there is an extra novelty effect that is noticeable on the second day, which is suggestive of a decreasing novelty effect over the course of subsequent days. Our findings could potentially be explained by the fact that the advantageous effects of novelty decrease as individuals age, likely due to deterioration in the neural pathways associated with novelty processing. In today's society, where the active contribution of older adults is increasingly valued, it is crucial to address age-related cognitive decline. In order to develop intervention for age-related memory decline, further research is necessary for the specific role of novelty-induced memory in older adults.Show less
This study focuses on the quality of sibling relationships, measured in warmth and conflict, and its association with internalizing- and externalizing-behavior problems in adolescence. For the...Show moreThis study focuses on the quality of sibling relationships, measured in warmth and conflict, and its association with internalizing- and externalizing-behavior problems in adolescence. For the study, 26 sibling pairs aged 8-15 years were included. These were only biological siblings and all lived in or near Leiden. The sibling pairs came to Leiden University to individually complete a VR task and a computer task and to fill out a questionnaire (SRQ-S). The parent also completed a questionnaire (CBCL 6-18 years) during the study. For this study, the CBCL and the SRQ-S were used. For this specific study, the younger sibling was examined because the older sibling influences the younger sibling more than the younger sibling influences the older sibling. The study found that conflict in a sibling relationship was positively related to internalizing behavior problems in the younger sibling. This can be explained by the cognitive model of depression: conflict causes stress and this stress relates to negative distortions of reality. These negative distorions of reality can form negative cognitive schema’s which relate to internalizing problems. There were no associations between warmth and internalizing problems and between warmth, conflict and externalizing problems. These conclusions must take into account that a general population sample was used: there were no high or low rates of warmth, conflict, internalizing and externalizing problems; they were avarage.Show less
This thesis aims to address the increasing necessity for employers to provide policies to support their employees’ parenthood. How successfully parents’ cope with the competing demands of being a...Show moreThis thesis aims to address the increasing necessity for employers to provide policies to support their employees’ parenthood. How successfully parents’ cope with the competing demands of being a working parent can have an influence on their well-being. It was proposed that a relationship between the policies parents use, and their general well-being would be also influenced by several factors, such as the age of the child, the gender of the parent, and the characteristics of the child. 137 working parents accessed an online survey through social media where they would report on demographics and the policies they have used and their level of satisfaction. Additionally, they completed the GHQ-12 for general well-being and Mary Rothbart’s temperament questionnaires, IBQ, ECBQ or CBQ, depending on their youngest’ child age. Linear regression analyses were performed to analyze the potential relationship between policies and well-being, as well as a hierarchical multiple regression analyses for moderation effects. Lastly, results did not support the hypotheses; however, a relationship between policies and general well-being was concluded. Against the initial hypothesis, it was found that parents that make use of a lot of policies are predicted to report lower general well-being levels, presenting a quality-quantity dilemma. This is explained through the parents’ subjective experience of policies. Companies are urged to provide adjusted support to their working parents while taking their opinion and individual circumstances into consideration.Show less
This study aimed to research the impact of timing in negotiations by manipulating the moment optional issues are introduced and the use of extra negotiation time. In contrary to what was expected,...Show moreThis study aimed to research the impact of timing in negotiations by manipulating the moment optional issues are introduced and the use of extra negotiation time. In contrary to what was expected, the results did not strongly support the hypothesis that introducing optional issues in the middle of negotiations leads to more integrative outcomes in comparison to beginning and ending. However, a minimal pattern was identified. Additionally, using extra time in negotiation did not significantly increase collective points earned. A slight trend appeared in the opposite direction. Factors like experimenter bias, sample size and asymmetrical pay-off sheets have possibly influenced the results. Suggestions for future research include replicating the study with small adjustments to minimize biases and exploring the role of perceived time pressure in negotiation outcomes. Furthermore, how people relate to each other might be of influence of favorability in negotiation. Despite the non-significant findings, this study contributes to our understanding of integrative negotiation dynamics and highlights the need for further research to identify effective strategies for achieving more integrative outcomes together.Show less
In this work, a near-zero stiffness mechanical filter is designed for use in STMs in a cryogenic environment. The filter is a Geometric anti-spring (GAS) filter which consists of a set of blades...Show moreIn this work, a near-zero stiffness mechanical filter is designed for use in STMs in a cryogenic environment. The filter is a Geometric anti-spring (GAS) filter which consists of a set of blades with a payload attached. This design allows for a low resonance frequency of 0.27 Hz and thus a low cutoff frequency in terms of filtering. First, a theoretical model is described in order to determine the relevant properties of the filter and its approximate workings. Second, the model was experimentally verified. From this, the resonance and damping of the filter were found. A limited amount of vibration measurements were also done to check if the filter is functioning as expected, however, due to instrumental limitations this was not conclusive.Show less
The present research investigates the effects of gain-framed messages on psychological detachment from work among self-employed workers in the UK with gain-framed messaging. The research also aims...Show moreThe present research investigates the effects of gain-framed messages on psychological detachment from work among self-employed workers in the UK with gain-framed messaging. The research also aims to investigate the moderating role of financial stress as well as explore the role of earlier psychological detachment in the effect of gain-framed messages. With Prolific Academic, the research team collected data from 226 individuals using a two-wave after the exclusion of some participants, between-subjects design. Three groups of participants were formed: a control group, those who received a message about health benefits, and those who received a message about performance enhancement. This research partially fills a gap in the literature by focusing on the difficulties encountered by the self-employed (as opposed to employees), thus encouraging research and publication of articles on this subject. Additionally, the results show that financial stress did not significantly moderate the effect of performance- gain messages (vs. health-gain messages) on psychological detachment. As a results, the effectiveness of performance-gain messages (vs. health-gain messages) in increasing detachment does not depend on self-employed workers’ levels of financial stress. This study implies that psychological detachment isn't distinctively influenced by the kind of communication (health or performance-related), regardless of the degree of financial stress. The aforementioned findings underscore the significance of customized messaging strategies in fostering well-being among independent contractors, stressing the crucial interaction between content uniqueness and personal financial situations. Furthermore, the exploratory analysis examined whether the initial detachment from work had an impact on how gain messages influenced later detachment. While other factors explained later detachment, initial detachment from work itself did not make the messages any more or less effective.Show less
