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We consider a simplified model based on the Navier-Stokes-Fourier system coupled to a transport equation and the Maxwell system, proposed to describe radiative flows in stars. We establish global- in-time existence for the associated initial-boundary value problem in the framework of weak solutions. Next, we study a hydrodynamical model describing the motion of internal stellar layers based on compressible Navier-Stokes-Fourier-Poisson system. We suppose that the medium is electrically charged, we include energy exchanges through radiative transfer and we assume that the system is steadily rotating. We analyze the singular limit of this system when the Mach number, the Alfven number, the Peclet number and the Froude number go to zero in a certain way and prove convergence to a 3D incompressible MHD system with a stationary linear transport equation for transport of radiation intensity. Finally, we show that the energy equation reduces to a steady equation for the temperature corrector.

My thesis focuses on the problems of ecotourism, or more precisely its borders from an anthropological perspective, using example of a typical Cambodian community named Chambok. Based on five months of research, together with ethnographic methods of research I found out that boundaries of ecotourism are complex, multi-layered, problematic and negotiated and also that there are so called "grey zones" encompassing them. It is the conceptualization of these zones and boundaries, which is my contribution to current anthropological debate about ecotourism, which has been largely left out until now.

Background: Several selected population-based studies have emphasized the significance of resting heart rate as an independent cardiovascular risk factor. However, there are no data available for using resting heart rate as a cardiovascular risk predictor in contemporary primary care. Thus, the aim of our analysis was to examine the clinical value of the measurement of resting heart rate in a large, unselected population-based cohort of primary care subjects under the conditions of contemporary primary prevention. Design: Prospective, population-based cohort study. Methods: We examined a subgroup of 5320 unselected primary care subjects free of coronary artery disease from the nationwide, longitudinal Diabetes Cardiovascular Risk Evaluation Targets and Essential Data for Commitment of Treatment (DETECT) cohort study, which was conducted from 2003 to 2008. Results: During the follow-up time of 5 years, 258 events were reported. Elevated resting heart rate was not associated with an increased risk for cardiovascular events (HR = 0.75, p = 0.394), cardiovascular mortality (HR = 0.71, p = 0.616) or major cardiovascular events (HR = 0.77, p = 0.376). By cross-sectional analysis, elevated heart rate clustered with markers of the metabolic syndrome, like increased blood pressure (systolic: OR = 5.54, p < 0.0001; diastolic: OR = 3.82, p < 0.0001), elevated fasting plasma glucose levels (OR = 8.84, p < 0.0001), hypertriglyceridaemia (OR = 22.16, p = 0.001), and obesity (body mass index OR = 0.89, p < 0.0001). Assessment of resting heart rate in clinical practice had minimal and non-significant additional prognostic value compared to established cardiovascular risk factors as judged by C statistics (C = 0.001, p = 0.979). Conclusion: The measurement of resting heart rate in the daily routine of primary care does not provide incremental prognostic information for cardiovascular risk stratification.

The settling of spherical and cylindrical particles in a linearly stratified fluid is investigated using experiments. The double-tank method is used to generate a linear stratification with a red colored dye homogeneously mixed in the heavy water tank. As a result of feeding the stratification using dyed heavy water, the concentration of dye varies with depth in the experiment tank. A powerful back-light and a digital camera are used to record the events. Assuming the concentration of dye is directly proportional to density of fluid, Beer-Lambert's law is used to generate a calibration between intensity of the light measured by the camera and density of the fluid. Using this calibration, density is evaluated in all the images captured. In the parameter space of this study, the spheres have three different wake patterns. The area of fluid disturbed by a suspension of spheres increases with <i>Re</i> and <i>Fr</i>. As a result, the amount of energy available for the mixing and the irreversible change of total potential energy in the system increases with <i>Re</i>, <i>Fr</i> and number of particles. Cylinders drag volumes of light fluid to larger depths in their wake than spheres and shed the light fluid in the form of vortices. This results in lower volumes of fluid perturbed by the cylinders. However, as the light fluid is dragged to larger depths, the amount of energy generated for mixing and the change in total potential energy of the system is higher. Spheres are thus more efficient in disturbing volumes of fluid but cylinders are more efficient in causing irreversible changes to the state of the system.

The present thesis deals with the subjective dimension of social stratification, more specifically subjective class and subjective status. The author begins by pointing to the subjective aspects of traditional theoretical backgrounds of class and hierarchical conception of social stratification. Then he analyzes subjective class and status as their analogous concepts and describes their application in empirical research, both foreign and Czech sociology. The analytical part presents its own secondary analysis of data from a representative survey ISSP 1992, 1999, 2009 and Social distance 2007 for the Czech Republic. Through this analysis author describes the differences between the two approaches and changes of their distribution and relation in time. Whereas subjective status is relatively stable in selected period, subjective class goes through a lot of changes. These changes are caused primarily by subjectively identified working class, whose representation weakens in time and approaches the class to subjective status. The author also deals with the differences of the declared reasons for identifying with class. For the lower classes it is especially their income which has the highest importance, middle and upper class also mentions the education and type of employment. But for higher classes it...

The aim of this study is to investigate how older adults were affected by the COVID-19 restrictions that were put in place by the Swedish Health Authority during the first wave of the COVID-19 pandemic to protect them and the roles played by social workers during the pandemic. A qualitative study was conducted whereby two older adults aged seventy and two practising professional workers were interviewed, and their responses analyzed using thematic analysis. The results showed that one of the older adults felt isolated, while the other did not have the same experience. The social workers on the other hand felt that they were responsible for the lives of their clients as well as that of their staff.

The experiences of African American women managers in predominantly Black work environments and the implication of these experiences on their ability to lead remains unknown. The purpose of this qualitative multiple case study was to gain deeper understanding of the leadership experiences of African American women managers employed in predominantly Black work environments. This study was framed by three key concepts: intersectionality of gender and race, intraracial discrimination, and colorism. The trustworthiness of the study's data was supported by employing methodological triangulation of the study's multiple data sources: semistructured interviews with 10 African American women managers as participants, journaling/ reflective field notes, and archival data. Cross case analysis revealed 8 categories that enclose a total of twelve themes: (a) career trajectory of African American woman manager, (b) gender challenges in a predominantly Black enterprise, (c) race challenges in a predominantly Black enterprise, (d) leadership experiences with subordinates informed by gender and race, (e) further career goals as an African American woman manager, (f) colorism in childhood and adolescence, (g) colorism in daily adult experiences, and (h) intraracial discrimination from subordinates based on skin tone. This study is likely to promote social change by sensitizing predominantly Black work environments on issues of equal treatment between gender groups and ways in which an intraracial context influences African American women's management experiences.

This thesis explores patterns of environmental inequality in Portland, Oregon; both the existence of spatial environmental inequalities and the structural and local forces which contribute to them. Research on environmental inequality, or inequitable exposure to toxins, has shown that minority and low-income populations experience the bulk of the exposure to environmental hazards. Although Portland is often cited as the archetype of a sustainable city, environmental inequality is a pervasive issue. This thesis examines the health inequalities that characterize underserved communities in Portland. Utilizing a mixed methods approach, the researcher uses 1) logistic regression to statistically assess the relationship between race, poverty, and Superfund site locations, and 2) in-depth interviews with members of Oregon's environmental justice movement to help understand the historical, social, political, and economic conditions of Portland and their subsequent influence on environmental inequalities. Quantitative data is pooled from 2000 census and 2011 Environmental Protection Agency (EPA) sources. The quantitative findings demonstrate that environmental inequality is present in Portland, with African Americans being particularly overrepresented in tracts with Superfund sites. The quantitative analyses ultimately suggest that minimally populated, highly impoverished tracts with approximately 11% African American residents are most likely to house a Superfund site. The qualitative findings show that a variety of structural and local forces play prominent roles in the formation of Portland's environmental inequalities. The qualitative analyses reveal this to be a multifaceted and complex process that is indicative of Portland's history of racial inequality, contemporary free market and business forces, and governmental interests which culminate in trends of inequitable development.

According to the National Vital Statistics Report (1998), Black women age 45-64 are ten times more likely than white women of the same age to die from diseases of the heart. They are five times more likely to die from diabetes. The goal of this study was to examine how articles published in leading medical journals between 1989 and 1998 accounted for such differences in health outcomes among Black and white women. The explanatory content of the articles was analyzed and coded according to four types of attributions: genetic/biological, cultural/behavioral, structural/socioeconomic and alternative. Each type of explanation derives from different assumptions and operates with different models for understanding why health outcomes vary among groups. Alternative explanations are those that focus on the direct effect of race/gender oppression on Black women's health. Genetic/biological attributions occurred less frequently than structural/socioeconomic and cultural behavioral but were more likely to occur than alternative attributions, which were the least often employed. While alternative attributions are considered in some of the articles about Black women's health and mortality, they are overall rarely employed. The finding that explanations that most directly explore the impact of racism and sexism on Black women's health occur least often has important implications. Articles published in these three journals inform medical practitioners and affect the ability of such practitioners to adequately address the needs of Black women in their care.