Fluid Dynamic and Stability Analysis of a Thin Liquid Sheet

Interest in thin sheet flows has recently been renewed due to their potential application in space radiators. Theoretical and experimental studies of the fluid dynamics and stability of thin liquid sheet flows have been carried out in this thesis. A computer program was developed to determine the cross-sectional shape of the edge cylinder given the cross-sectional area of the edge cylinder. A stability analysis was performed on a non-planer liquid sheet. A study was conducted to determine the effects of air resistance on the sheet

Radical self-care : performance, activism, and queer people of color

textQueer people of color in the United States are perpetually under siege politically, psychically, economically, physically, and affectively in the twenty-first century under capitalist white supremacist heteropatriarchy. Radical Self-Care, connects radical artivist performance in Austin, Texas with the theoretical genealogies of queer of color critique, women of color feminism, queer studies, and performance studies in order to propose a program for queer of color survival, sustainment and political revolt. Radical self-care is the holistic praxis that names the confluence of two distinct but inextricable processes developed in the first two chapters of this thesis. In chapter one, I take up the Generic Ensemble Company’s workshop production of What’s Goin’ On? as a case study in order to theorize the ‘performative of sustenance,’ a mechanism of queer worldmaking and queer world sustainment defined by its erotic and utopian affects. Chapter two, through a discussion of reproductive rights activism at the Texas state capitol, reformulates the concept of ‘parrhesia,’ the Socratic practice of ‘free speech’ taken up by Foucault in discussions of the care of the self, into a performance praxis of speaking truth to power with the potential to interrupt hegemonic systems of oppression. The final chapter explicates the ways in which these two mechanisms converge and operate as a dyad in the holistic process of radical self-care through an analysis of Fat: The Play, a devised work that premiered in Austin by and about fat queer femmes. Ultimately, Radical Self- Care aspires to offer queers of color a methodology of queer world sustainment that is also a program of political intervention, grounded in solidarity politics, into those systems of oppression that too often characterize queer of color existence as a project of survival rather than a project of flourishing.Theatre and Danc

Stability of Thin Liquid Sheet Flows

A two-dimensional, linear stability analysis of a thin nonplanar liquid sheet flow in vacuum is carried out. A sheet flow created by a narrow slit of W and tau attains a nonplanar cross section as a consequence of cylinders forming on the sheet edge under the influence of surface tension forces. The region where these edge cylinders join the sheet is one of high curvature, and this is found to be the location where instability is most likely to occur. The sheet flow is found to be unstable, but with low growth rates for symmetric wave disturbances and high growth rates for antisymmetric disturbances. By combining the symmetric and antisymmetric disturbance modes, a wide range of stability characteristics is obtained. The product of unstable growth rate and flow time is proportional to the width-to-thickness ratio of the sift generating the sheet Three-dimensional effects can alter these results, particularly when the sheet length-to-width ratio is not much greater than unity

A study of thin liquid sheet flows

This study was a theoretical and experimental investigation of thin liquid sheet flows in vacuum. A sheet flow created by a narrow slit of width, W, coalesces to a point at a distance, L, as a result of surface tension forces acting at the sheet edges. As the flow coalesces, the fluid accumulates in the sheet edges. The observed triangular shape of the sheet agrees with the calculated triangular result. Experimental results for L/W as a function of Weber number, We, agree with the calculated result, L/W = the sq. root of 8We. The edge cross sectional shape is found to oscillate from elliptic to 'cigar' like to 'peanut' like and then back to elliptic in the flow direction. A theoretical one-dimensional model was developed that yielded only elliptic solutions for the edge cross section. At the points where the elliptic shapes occur, there is agreement between theory and experiment

A SuperWASP Light Curve Displaying a Single Long-duration Transit: A Jupiter Size Exoplanet in a Very Distant Orbit?

We present the SuperWASP light curve of a 10th magnitude A7V star containing a single, well-defined U-shaped transit-like event lasting around 11 days with a depth of 1.1%. The star is otherwise non-variable throughout the 8 yr duration of the observations. If the event is modeled as an exoplanet transit, it is compatible with a 1.8 RJ exoplanet in a ∼205 au orbit with a period of ∼2200 yr

Online social media tells a story of Anaselina, Paraselina, and Selivinga (Orthoptera, Tetrigidae), rare Australian pygmy grasshoppers

Knowledge on the pygmy grasshoppers of Australia is, despite the numerous endemics being described from this unique continent, still scarce. Of interest is the Vingselina genus group, including genera Anaselina Storozhenko, 2019, Paraselina Storozhenko, 2019, Selivinga Storozhenko, 2019 and Vingselina Sjostedt, 1921. The systematic position of this group, currently assigned to Batrachideinae (Bufonidini), is probably not correct. In this study new records are presented of Anaselina minor (Sjostedt, 1921), Paraselina brunneri (Bolivar, 1887), P trituberculata (Sjastedt, 1932), and Selivinga tribulata Storozhenko, 2019, all except A. minor the first records of the species since their original descriptions. The first photographs of living specimens of A. minor, P. brunneri, P. trituberculata and S. tribulata are provided and their habitats described. All the records were compiled by citizen scientists who use online social media, such as iNaturalist. Lastly, P. multifora (Rehn, 1952) syn. nov. represents a junior synonym of P. brunneri

Slow magnetic relaxation in Fe(ii) m-terphenyl complexes

Two-coordinate transition metal complexes are exciting candidates for single-molecule magnets (SMMs) because their highly axial coordination environments lead to sizeable magnetic anisotropy. We report a series of five structurally related two-coordinate Fe(II) m-terphenyl complexes (4-R-2,6-Xyl2C6H2)2Fe [R = tBu (1), SiMe3 (2), H (3), Cl (4), CF3 (5)] where, by changing the functionalisation of the para-substituent (R), we alter their magnetic function. All five complexes are field-induced single-molecule magnets, with relaxation rates that are well-described by a combination of direct and Raman mechanisms. By using more electron donating R groups we were able to slow the rate of magnetic relaxation. Our ab initio calculations predict a large crystal field splitting (>850 cm−1) and sizeable zero-field splitting parameters (ca. −60 cm−1, |E| < 0.2 cm−1) for 1–5. These favourable magnetic properties suggest that m-terphenyl ligands have untapped potential as chemically versatile ligands able to impose highly axial crystal fields

The Dark Internet: An Exploration of Culture and User Experience

Our research sought to investigate the culture of the Dark Internet through a combination of cultural analysis and experiential learning. We split our research into three major portions: analysis of culture of the Dark Internet through the way it is viewed by various media outlets and on the Dark Internet itself; how the culture of the Dark Internet reacts in times of crises; and a comparison of the experience of the users of Dark Internet marketplaces versus users of traditional internet marketplaces. Our cultural analysis was accomplished through the use of textual coding; by coding the articles, forums, and pages that we were gathering, we were able to find and observe key commonalities in behavior and communication among the sources. We also went through the process of purchasing goods from both Dark Internet marketplaces and traditional internet marketplaces allowing us to compare the experiences in a variety of ways including: ease of access, ease of purchase, delivery time, etc. This research aims to provide further insight into the nature of the Dark Internet and open the way for future research into this ever-changing culture

The Hepatic Compensatory Response to Elevated Systemic Sulfide Promotes Diabetes

Impaired hepatic glucose and lipid metabolism are hallmarks of type 2 diabetes. Increased sulfide production or sulfide donor compounds may beneficially regulate hepatic metabolism. Disposal of sulfide through the sulfide oxidation pathway (SOP) is critical for maintaining sulfide within a safe physiological range. We show that mice lacking the liver- enriched mitochondrial SOP enzyme thiosulfate sulfurtransferase (Tst−/− mice) exhibit high circulating sulfide, increased gluconeogenesis, hypertriglyceridemia, and fatty liver. Unexpectedly, hepatic sulfide levels are normal in Tst−/− mice because of exaggerated induction of sulfide disposal, with associated suppression of global protein persulfidation and nuclear respiratory factor 2 target protein levels. Hepatic proteomic and persulfidomic profiles converge on gluconeogenesis and lipid metabolism, revealing a selective deficit in medium-chain fatty acid oxidation in Tst−/− mice. We reveal a critical role of TST in hepatic metabolism that has implications for sulfide donor strategies in the context of metabolic disease