Title:  Universal wave patterns

Abstract:  A feature of solutions of a (generally nonlinear) field

theory can be called "universal" if it is independent of side conditions like initial data. I will explain this phenomenon in some detail and then illustrate it in the context of the sine-Gordon equation, a fundamental relativistic nonlinear wave equation. In particular I will describe some recent results (joint work with R. Buckingham) concerning a universal wave pattern that appears for all initial data that crosses the separatrix in the phase portrait of the simple pendulum.  The pattern is fantastically complex and beautiful to look at but not hard to describe in terms of elementary solutions of the sine-Gordon equation and the collection of rational solutions of the famous inhomogeneous Painlev\'e-II equation.

Title:  Universal wave patterns

Abstract:  A feature of solutions of a (generally nonlinear) field

theory can be called "universal" if it is independent of side conditions like initial data. I will explain this phenomenon in some detail and then illustrate it in the context of the sine-Gordon equation, a fundamental relativistic nonlinear wave equation. In particular I will describe some recent results (joint work with R. Buckingham) concerning a universal wave pattern that appears for all initial data that crosses the separatrix in the phase portrait of the simple pendulum.  The pattern is fantastically complex and beautiful to look at but not hard to describe in terms of elementary solutions of the sine-Gordon equation and the collection of rational solutions of the famous inhomogeneous Painlev\'e-II equation.

Title:  Automating and Stabilizing the Discrete Empirical Interpolation Method for Nonlinear Model Reduction

Abstract:  The Discrete Empirical Interpolation Method (DEIM) is a technique for model reduction of nonlinear dynamical systems.  It is based upon a modification to proper orthogonal decomposition which is designed to reduce the computational complexity for evaluating reduced order nonlinear terms.  The DEIM approach is based upon an interpolatory projection and only requires evaluation of a few selected components of the original nonlinear term.  Thus, implementation of the reduced order nonlinear term requires a new code to be derived from the original code for evaluating the nonlinearity.  I will describe a methodology for automatically deriving a code for the reduced order nonlinearity directly from the original nonlinear code.  Although DEIM has been effective on some very difficult problems, it can under certain conditions introduce instabilities in the reduced model.  I will present a problem that has proved helpful in developing a method for stabilizing DEIM reduced models.

Title:  Automating and Stabilizing the Discrete Empirical Interpolation Method for Nonlinear Model Reduction

Abstract:  The Discrete Empirical Interpolation Method (DEIM) is a technique for model reduction of nonlinear dynamical systems.  It is based upon a modification to proper orthogonal decomposition which is designed to reduce the computational complexity for evaluating reduced order nonlinear terms.  The DEIM approach is based upon an interpolatory projection and only requires evaluation of a few selected components of the original nonlinear term.  Thus, implementation of the reduced order nonlinear term requires a new code to be derived from the original code for evaluating the nonlinearity.  I will describe a methodology for automatically deriving a code for the reduced order nonlinearity directly from the original nonlinear code.  Although DEIM has been effective on some very difficult problems, it can under certain conditions introduce instabilities in the reduced model.  I will present a problem that has proved helpful in developing a method for stabilizing DEIM reduced models.

Emancipation, New Sensibility, and the Challenge of a New Era: Theory, Practice, and Pedagogy. 

Sessions all day Thursday, Friday & Saturday in the UK Student Center with scholars and students from around the world.

Emancipation, New Sensibility, and the Challenge of a New Era: Theory, Practice, and Pedagogy. 

Sessions all day Thursday, Friday & Saturday in the UK Student Center with scholars and students from around the world.

TITLE: Square roots of divergence form operators on L^p spaces

ABSTRACT: An abstract is available online at

http://www.ms.uky.edu/~kott/PDEseminarf13/Haller-Dintelmann.pdf

Invisible War (2011), an Academy Award-nominated documentary, will be shown for free this Saturday morning, April 20, 2013,  at 10 AM at the Kentucky Theater.  This film documents the lives of women and men who have been sexually assaulted while serving in the U.S. military.  Several of the survivors have roots in Kentucky, and some of them will be at the screening to answer questions.  Come out, see the film, hear their stories.

Sponsored by UK Arts and Sciences, Anthropology, English, History, WRD (Writing, Rhetoric, and Digital Media), American Studies and the Center for research on Violence Against Women (CRVAW)

Invisible War (2011), an Academy Award-nominated documentary, will be shown for free this Saturday morning, April 20, 2013,  at 10 AM at the Kentucky Theater.  This film documents the lives of women and men who have been sexually assaulted while serving in the U.S. military.  Several of the survivors have roots in Kentucky, and some of them will be at the screening to answer questions.  Come out, see the film, hear their stories.

Sponsored by UK Arts and Sciences, Anthropology, English, History, WRD (Writing, Rhetoric, and Digital Media), American Studies and the Center for research on Violence Against Women (CRVAW)

Derek Gregory, University of British Columbia: “Gabriel's War: Cartography and the Changing Art of War"

January 25, 2pm

Lexmark Room, Main Building

      Dr. Derek Gregory is a member of the Department of Geography and one of two Peter Wall Distinguished Professors at the Peter Wall Institute for Advanced Studies at the University of British Columbia in Vancouver, Canada.  Dr. Gregory trained as an historical geographer at the University of Cambridge. His research focused on the historical geography of industrialization and on the relations between social theory and human geography and explored a range of critical theories that showed how place, space, and landscape have been involved in the operation and outcome of social processes. His 1982 book, Regional Transformation and Industrial Revolution, was staged on the classic ground of E.P. Thompson’s Making of the English Working Class. Following a move to Vancouver in 1989, Gregory’s work was reinforced by postcolonial critique, outlined in his 1989 book Geographical Imaginations. This new phase of work owed much to Edward Said’s critique of Orientalism, but it was much more concerned with the corporeality and physicality of travel – with embodied subjects moving through material landscapes – and with the constantly changing (often mislaid) cultural baggage of the travelers. And it paid attention what travelers mapped, sketched, and photographed – and to the consequences these representations had for their encounters.

This work on travel and travel writing was interrupted by the terrorist attacks on the World Trade Center and the Pentagon on 11 September 2001, and the focus of his research shifted to the present. Drawing on his training as an historical geographer and his sense of the renewed power of Orientalism, Dr. Gregory traced the long history of British and American involvements in the “Middle East,” and showed how these affected the cultural, political, and military responses to 9/11. The Colonial Present: Afghanistan, Palestine, Iraq (2004) showed how war quite literally takes place, and described in detail the violent ‘taking of places’ not only in Afghanistan and Iraq but in occupied Palestine. The study showed how the conduct of war connects the abstractions of geopolitics – the pronouncements of politicians, the strategies of generals – to the lives and deaths of countless ordinary men and women.

His forthcoming book, The Everywhere War, shows how the conduct of war is shaped by the spaces through which it is conducted; ranging from the global war prison at Guantanamo Bay through counterinsurgency in Baghdad and the drone wars in Afghanistan/Pakistan. His new research project, Killing space, is a critical study of the techno-cultural and political dimensions of air war. It focuses on three major campaigns: the combined bombing offensive against Germany in the Second World War, America’s air wars over Indochina, and the present use of UAVs in Afghanistan/Pakistan, Somalia, Yemen, and elsewhere.  It pays particular attention to the changing ways in which cities (and eventually people) have been visualized as targets within what is now called the ‘kill-chain,’ and to the different ways in which the media have represented and reported bombing to different publics.