2,269 research outputs found

    Antitrust Aspects of Transatlantic Investment

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    Antitrust Aspects of Transatlantic Investment

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    In this diploma work a discrete cubic nonlinear Schrödinger equation (DNLS) is used as a model for the evolution of the electric field in a system of coupled waveguides with nonlinear index of refraction.The DNLS is inferred from Maxwell’s equations by expanding the induced charge polarization in a power series, thereby perturbing a single electromagnetic mode. The properties of the model are then derived form a stationary action principle, of particular interest is the construction of a continuity equation and thereby a power flow J between the sites. For systems with periodic boundary conditions there exist so-called vortex solutions with J circulating over the sites. Numerical experiments in the 6-site system are then carried out to investigate the behavior of the current when a vortex solution is perturbed to see whether this could result in a reversed current (vorticity). When a large perturbation was applied to a vortex solution near the limit of linear stability a "vortex breather" solution with a sinusoidally flowing current was found

    Jig Twist Optimization of Mach 0.745 Transonic Truss-Braced Wing Aircraft and High-Fidelity CFD Validation

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    This paper presents a jig twist optimization study of Mach 0.745 Transonic Truss-Braced Wing (TTBW) aircraft using an in-house developed aero-structural analysis solver VSPAERO coupled to BEAM3D. A vortex-lattice model of the TTBW model is developed, and a transonic and viscous flow correction method is implemented in the VSPAERO model to account for transonic and viscous flow effects. A correction method for the wing-strut interference aerodynamics is developed and applied to the VSPAERO solver. Also, a structural dynamic finite-element model of the TTBW aircraft is developed. This finite-element model includes the geometric nonlinear effect due to the tension in the struts which causes a deflection-dependent nonlinear stiffness. The VSPAERO model is coupled to the corresponding finite-element model to provide a rapid aero-structural analysis. A flight condition corresponding to Mach 0.745 at 42000 ft is selected for the TTBW aircraft jig twist optimization to reduce the drag coefficient. After the design is implemented, the drag coefficient of the twist optimized TTBW aircraft is reduced about 8 counts. At the end, a high-fidelity CFD solver FUN3D is used to validate the design

    Jig Twist Optimization of Mach 0.745 Transonic Truss-Braced Wing Aircraft and High-Fidelity CFD Validation

    Get PDF
    This paper presents a jig twist optimization study of Mach 0.745 Transonic Truss-Braced Wing (TTBW) aircraft using an in-house developed aero-structural analysis solver VSPAERO coupled to BEAM3D. A vortex-lattice model of the TTBW model is developed, and a transonic and viscous flow correction method is implemented in the VSPAERO model to account for transonic and viscous flow effects. A correction method for the wing-strut interference aerodynamics is developed and applied to the VSPAERO solver. Also, a structural dynamic finite-element model of the TTBW aircraft is developed. This finite-element model includes the geometric nonlinear effect due to the tension in the struts which causes a deflection-dependent nonlinear stiffness. The VSPAERO model is coupled to the corresponding finite-element model to provide a rapid aero-structural analysis. A design flight condition corresponding to Mach 0.745 at 42000 ft is selected for the TTBW aircraft jig twist optimization to reduce the drag coefficient. After the design is implemented, the drag coefficient of the twist optimized TTBW aircraft is reduced about 8 counts. At the end, a high-fidelity CFD solver FUN3D is used to validate the design

    A Moral Debate at the Invisible Rainbow: Thoughts about Best Practices in Servicing LGBTQ Students in Special Education

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    Instead of occupying a marginal space within teacher preparation programs, special education courses and training should promote diversity in servicing marginalized groups such as lesbian, gay, bisexual, transgender, and questioning (LGBTQ) students. Within these programs, issues related to LGBTQ students should occupy a meaningful and formative space in the training of future teachers in special education. Often, special education teachers are at a loss about how to educate LGBTQ students with disabilities. Rethinking the role of special education and LGBTQ students with special needs within teacher education programs enables pre-service teachers to cultivate new values and attitudes that can enrich the student/teacher relationship within public schools. As such, this article proposes to explore best practices for servicing LGTBQ students in special education by promoting better ways to train future teachers

    Satyrs, Syphilis, and Sailors: The Influence of Gaius Petronius’ Satyricon Liber on Samuel Taylor Coleridge’s “The Rime of the Ancient Mariner”

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    For generations, Samuel Taylor Coleridge’s “The Rime of the Ancient Mariner” has befuddled readers. This project argues that many of its apparent puzzles disappear once we recognize its base text as the Satyricon Liber, Gaius Petronius’ first-century vulgar comedy. Attending to Coleridge’s broader literary corpus alongside images of sexual dysfunction in “The Rime” itself to justify this foundational claim, I then explore how a comic source transforms the reader’s experience of “The Rime” and its criticism. “The Rime” refutes cohesive readings as a horror-poem because it was never intended as pure horror: rather, the poem is Coleridge’s attempt to modernize a classic, low-browed farce

    Brent Fugate, Senior Percussion Recital

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    Book Review

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    The contemporary countertenor in context: vocal production, gender/sexuality, and reception

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    This dissertation highlights the importance of vocal registration/production in the ongoing discussion of how the material qualities of the singing voice transmit socially constructed meaning. Using the modern-day countertenor as an example, I show how falsetto singing can act as a marker for gender/sexuality. The first chapter of the project explains the anatomy and physiology of the singing voice, particularly as it applies to the falsetto register and the contemporary countertenor. Then, a brief look at how singing and gender fit within the burgeoning field of voice studies ensues. Chapter 2 inspects theories of vocal gender, identity, and sexuality in regards to vocal embodiment and applies them to the voice, singing, and the contemporary countertenor. Chapter 3 looks at the reception theories of Hans Robert Jauss and Wolfgang Iser in order to pinpoint ways in which social norms can be inscribed on the voice, especially that of the countertenor Klaus Nomi. The last three chapters apply the theories purported in the first half of the dissertation to the contemporary countertenor in three countries–the United States, England, and Japan. Examining the use and appreciation of the countertenor in these different societies provides examples of how the falsetto register, singing, and norms of gender/sexuality are connected in the different social contexts. The epilogue projects how this type of academic inquiry can extend to other types of singing and societies
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