Understanding the True Nature of War: Dr. James Clifton’s Lecture Mediated War

Wartime artwork allows us to experience certain aspects of battle and its aftermath and yet to also be distanced from it: When viewing the artwork, we get a small visual window into the carnage and devastation of war, but we are spared the affronts to our other senses. This concept was present in Dr. James Clifton’s lecture, Meditated War. Dr. Clifton, the director of the Sarah Cambell Blaffer Foundation at the Museum of Fine Arts, Houston, coordinated with Gettysburg College to loan the collection of European war prints for the exhibit, The Plains of Mars. The exhibition is currently on display at Schmucker Art Gallery and will remain so until December 7th. The pieces are comprised of wartime images from 1500 through 1825 and depict battles, individual soldiers, and civilians. Dr. Clifton’s lecture focused primarily on what one can learn from wartime art, specifically war prints, but also what they lack. [excerpt

Making Photographs Speak

It has often been said that “a picture is worth a thousand words.” Making that picture spit out those mythical thousand words, as we can all attest, is no easy task. Over the course of the first half of the fall semester, the three of us were tasked with developing brief interpretive captions for two Civil War photographs each, with the end goal to display our work at the Civil War Institute’s 2019 Summer Conference. What initially appeared as a simple project quickly revealed itself to be a difficult, yet rewarding, challenge that taught us all important lessons concerning history, photography, and writing that we will not soon forget. Producing the photography exhibit enhanced our skills as historical writers, introduced us to the challenge of writing for a popular audience, and deepened our understanding of Civil War photography. [excerpt

Collisional dissipation of Alfvén waves in a partially ionised solar chromosphere

Certain regions of the solar atmosphere are at sufficiently low temperatures to be only partially ionised. The lower chromosphere contains neutral atoms, the existence of which greatly increases the efficiency of the damping of waves due to collisional friction momentum transfer. More specifically the Cowling conductivity can be up to 12 orders of magnitude smaller than the Spitzer value, so that the main damping mechanism in this region is due to the collisions between neutrals and positive ions (Khodachenko et al. 2004, A&A, 422, 1073). Using values for the gas density and temperature as functions of height taken from the VAL C model of the quiet Sun (Vernazza et al. 1981, ApJS, 45, 635), an estimate is made for the dependance of the Cowling conductivity on height and strength of magnetic field. Using both analytic and numerical approaches the passage of Alfvén waves over a wide spectrum through this partially ionised region is investigated. Estimates of the efficiency of this region in the damping of Alfvén waves are made and compared for both approaches. We find that Alfvén waves with frequencies above 0.6 Hz are completely damped and frequencies below 0.01 Hz unaffected

SpineML and Brian 2.0 interfaces for using GPU enhanced Neuronal Networks (GeNN)

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On the Representation Theory of an Algebra of Braids and Ties

We consider the algebra ${\cal E}_n(u)$ introduced by F. Aicardi and J. Juyumaya as an abstraction of the Yokonuma-Hecke algebra. We construct a tensor space representation for ${\cal E}_n(u)$ and show that this is faithful. We use it to give a basis for ${\cal E}_n(u)$ and to classify its irreducible representations.Comment: 24 pages. Final version. To appear in Journal of Algebraic Combinatorics

The theory of heating of the quantum ground state of trapped ions

Using a displacement operator formalism, I analyse the depopulation of the vibrational ground state of trapped ions. Two heating times, one characterizing short time behaviour, the other long time behaviour are found. The short time behaviour is analyzed both for single and multiple ions, and a formula for the relative heating rates of different modes is derived. The possibility of correction of heating via the quantum Zeno effect, and the exploitation of the suppression of heating of higher modes to reduce errors in quantum computation is considered.Comment: 9 pages, 2 figure

Introducing Health Promotion Agenda-Setting for Health Education Practitioners

Health professionals must continuously address health promotion issues using the latest strategies and research. Currently in health care, too often an underdeveloped and under supported agenda prioritizes problems, issues, and solutions. Further, an ongoing competition exists among issues due to an undocumented agenda-setting process to gain the attention of media, public, and policy makers. Agendasetting is based on the belief that the media influence what we talk about, rather than controlling what we think, and how often an issue appears in the media influences the policy agenda (Dearing & Rogers, 1996). If an issue is “salient” and receives frequent or expansive coverage by media, audience members will talk more about that issue than one that is not as salient. A Health Promotion Agenda-Setting approach works to specify and prioritize problems and alternative solutions for increasing media exposure and setting agendas for “sustained” courses of action, (Kozel et al., 2003). The crucial link between agenda-setting and the process of establishing effective legislation, policy, and programs has been researched. However, many health practitioners do not understand what agenda setting is, nor how to apply agenda setting within the field of health education. Professional development in Health Promotion Agenda-Setting offers health education practitioners new knowledge, skills, methods, and opportunities to strengthen practices that influence the public health agenda and transform health promotion leadership

The impact of heavy-quark loops on LHC dark matter searches

If only tree-level processes are included in the analysis, LHC monojet searches give weak constraints on the dark matter-proton scattering cross section arising from the exchange of a new heavy scalar or pseudoscalar mediator with Yukawa-like couplings to quarks. In this letter we calculate the constraints on these interactions from the CMS 5.0/fb and ATLAS 4.7/fb searches for jets with missing energy including the effects of heavy-quark loops. We find that the inclusion of such contributions leads to a dramatic increase in the predicted cross section and therefore a significant improvement of the bounds from LHC searches.Comment: 12 pages, 1 table, 3 figures, v2: extended discussion and improved relic density calculation - matches published versio

Golden gaskets: variations on the Sierpi\'nski sieve

We consider the iterated function systems (IFSs) that consist of three general similitudes in the plane with centres at three non-collinear points, and with a common contraction factor \la\in(0,1). As is well known, for \la=1/2 the invariant set, \S_\la, is a fractal called the Sierpi\'nski sieve, and for \la<1/2 it is also a fractal. Our goal is to study \S_\la for this IFS for 1/2<\la<2/3, i.e., when there are "overlaps" in \S_\la as well as "holes". In this introductory paper we show that despite the overlaps (i.e., the Open Set Condition breaking down completely), the attractor can still be a totally self-similar fractal, although this happens only for a very special family of algebraic \la's (so-called "multinacci numbers"). We evaluate \dim_H(\S_\la) for these special values by showing that \S_\la is essentially the attractor for an infinite IFS which does satisfy the Open Set Condition. We also show that the set of points in the attractor with a unique ``address'' is self-similar, and compute its dimension. For ``non-multinacci'' values of \la we show that if \la is close to 2/3, then \S_\la has a nonempty interior and that if \la<1/\sqrt{3} then \S_\la$ has zero Lebesgue measure. Finally we discuss higher-dimensional analogues of the model in question.Comment: 27 pages, 10 figure

Exploring Agenda-Setting for Healthy Border 2010: Research Directions and Methods

Policy makers take action largely on issues that attain the pinnacle of the policy agenda (Pertschuck, 2001). As a result, how decision makers choose which issues are important has been the subject of much research. Agenda-setting conceptualizes the process of how issues move from relative unimportance to the forefront of policymakers’ thoughts (Dearing & Rogers, 1996). An area within agenda-setting research, Health Promotion Agenda-Setting, provides Health Promotion practitioners with an innovative framework and strategy to set agendas for sustained courses of action (Kozel, Kane, Rogers, & Hammes, 1995). In this interdisciplinary and bi-national exploratory study, funded by the Center for Border Health Research of the Paso del Norte Health Foundation, we examine agenda-setting processes in the Paso del Norte Region and evaluates how the public health agenda is determined within the U.S.-Mexico border population. Integrating both quantitative and qualitative data collection methods, the current research is focused on identifying deficiencies in the public health infrastructure in the U.S.-Mexico border area, and identifying channels that exist for working toward the bi-national goals presented in Healthy Border 2010 (U.S.-Mexico Border Health Commission, 2003). Research directions, design, and methodologies for exploring health promotion agenda-setting in applied settings, such as Healthy Border 2010, provide health practitioners and policy makers the potential to improve public health leadership by influencing the public health and policy agendas