Abundance Analysis of the Halo Giant HD122563 with Three-Dimensional Model Stellar Atmospheres

We present a preliminary local thermodynamic equilibrium (LTE) abundance analysis of the template halo red giant HD122563 based on a realistic, three-dimensional (3D), time-dependent, hydrodynamical model atmosphere of the very metal-poor star. We compare the results of the 3D analysis with the abundances derived by means of a standard LTE analysis based on a classical, 1D, hydrostatic model atmosphere of the star. Due to the different upper photospheric temperature stratifications predicted by 1D and 3D models, we find large, negative, 3D-1D LTE abundance differences for low-excitation OH and Fe I lines. We also find trends with lower excitation potential in the derived Fe LTE abundances from Fe I lines, in both the 1D and 3D analyses. Such trends may be attributed to the neglected departures from LTE in the spectral line formation calculations.Comment: 4 pages, 4 figures, contribution to proceedings for Joint Discussion 10 at the IAU General Assembly, Rio de Janeiro, Brazil, August 200

The Heroic Struggle of Pleasing a Mad King: An Actor’s Exploration of the Earl of Kent in William Shakespeare’s \u3ci\u3eKing Lear\u3c/i\u3e

This thesis is the research and analysis of the creative process I used in the University of Nebraska-Lincoln Johnny Carson School of Theatre and Film’s 2009 production of King Lear. It is comprised of three main parts. Part One: Research explores the life and work of William Shakespeare. Part Two: A Study of King Lear examines the history of King Lear including major themes and performance history. Part Three: Process provides insight to the thought process of an actor while building a character. Additional materials include documentation of the rehearsal and performance, script analysis, and critical responses to the actor’s performance

The Heroic Struggle of Pleasing a Mad King: An Actor’s Exploration of the Earl of Kent in William Shakespeare’s \u3ci\u3eKing Lear\u3c/i\u3e

This thesis is the research and analysis of the creative process I used in the University of Nebraska-Lincoln Johnny Carson School of Theatre and Film’s 2009 production of King Lear. It is comprised of three main parts. Part One: Research explores the life and work of William Shakespeare. Part Two: A Study of King Lear examines the history of King Lear including major themes and performance history. Part Three: Process provides insight to the thought process of an actor while building a character. Additional materials include documentation of the rehearsal and performance, script analysis, and critical responses to the actor’s performance

Fifty Years of College Choice: Social, Political and Institutional Influences on the Decision-Making Process

Explores how the process of choosing colleges has evolved for high school students during the second half of the twentieth century, the factors behind the changes, and the implications of recent developments for postsecondary equity, access, and success

The challenge of policy coordination for sustainable sociotechnical transitions: the case of the zero-carbon homes agenda in England

Emerging in recent research on sociotechnical transitions towards a low-carbon economy is the question of the extent to which such transitions require centralised, intentional coordination by government. Drawing from Hayek's conceptualisation of coordination, I evaluate the effectiveness of policy for low-carbon and zero-carbon homes in England. A detailed analysis is presented of how policy makers address complex choices and trade-offs as well as significant uncertainty. Particular attention is given to those policy decisions which are widely agreed by stakeholders to cause distortive effects. The focus here on the impacts of policy definition and delivery in terms of multiple evaluative criteria can complement and enrich the more process-orientated cross-sector and multilevel analyses that predominate in existing research on policy coordination. Furthermore, the coordination problems identified yield further insights into the actual and potential effectiveness of policy processes in shaping complex sociotechnical transitions

The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - I. Methods and General Properties

We present the Stagger-grid, a comprehensive grid of time-dependent, 3D hydrodynamic model atmospheres for late-type stars with realistic treatment of radiative transfer, covering a wide range in stellar parameters. This grid of 3D models is intended for various applications like stellar spectroscopy, asteroseismology and the study of stellar convection. In this introductory paper, we describe the methods used for the computation of the grid and discuss the general properties of the 3D models as well as their temporal and spatial averages (). All our models were generated with the Stagger-code, using realistic input physics for the equation of state (EOS) and for continuous and line opacities. Our ~220 grid models range in Teff from 4000 to 7000K in steps of 500K, in log g from 1.5 to 5.0 in steps of 0.5 dex, and [Fe/H] from -4.0 to +0.5 in steps of 0.5 and 1.0 dex. We find a tight scaling relation between the vertical velocity and the surface entropy jump, which itself correlates with the constant entropy value of the adiabatic convection zone. The range in intensity contrast is enhanced at lower metallicity. The granule size correlates closely with the pressure scale height sampled at the depth of maximum velocity. We compare the models with widely applied 1D models, as well as with theoretical 1D hydrostatic models generated with the same EOS and opacity tables as the 3D models, in order to isolate the effects of using self-consistent and hydrodynamic modeling of convection, rather than the classical mixing length theory approach. For the first time, we are able to quantify systematically over a broad range of stellar parameters the uncertainties of 1D models arising from the simplified treatment of physics, in particular convective energy transport. In agreement with previous findings, we find that the differences can be significant, especially for metal-poor stars.Comment: Accepted for publication in A&A, 31 pages, 29 figure