Observing the New South Africa

Orlando Redekopp was an international observer of the 1994 South Africa General Election through the Ecumenical Monitoring Programme in South Africa (EMPSA). Authored by Redekopp, this narrative provides a brief memoir of his time in South Africa monitoring the elections.https://digitalcommons.colum.edu/saelection/1010/thumbnail.jp

On upstream blocking in a viscous diffusive stratified flow

The effect of diffusion of specie upon the flow about a transverse flat plate moving horizontally in a viscous stratified medium is considered. Asymptotic expansions are used to define a parameter regime where a viscous-diffusive-buoyancy balance is dominant. The solution, expressed in terms of an inverse Fourier transform, is numerically integrated. The results show that, as in the non-diffusive problem, a region of closed streamlines exists ahead of the body. However, unlike the case where diffusion is neglected, the density field within this recirculating region is uniquely determined and found to be statically stable. It is also found that varying the relative amount of diffusion affects not only the density distribution, but the velocity profile as well, indicating a strong coupling between the vorticity and specie equation

PERFORMING (FEMALE) MASCULINITY IN THE EARLY MODERN IBERO-ATLANTIC WORLD: AN ANALYSIS OF THE MUJER VARONIL IN GENDER AND GENRE

The following dissertation on the trope of the mujer varonil[1] employs bibliographical research in literary criticism and historiography to identify and describe socio-historic attitudes about gender. In particular, this dissertation examines gender as communicated by texts that use the mujer varonil, or “masculine woman”, characterization to either praise or vilify exceptional female subjects in ways that highlight normative limits for masculine and feminine gender expression. Four texts are examined: a male author writes each and each represents a literary genre that was significant in early modern Spain and Spanish America. These genres are the hagiography, the relación, the inquisition proceeding, and the comedia. These texts communicate important attitudes about gender-bending that are associated with cultural limits for gender expression, which inform boundaries that demarcate three normative gender roles: male, female and third gender. The selected texts are didactic because they communicate limits for gender-bending by exceptional females that ultimately reinforce an androcentric social structure and its associated normative gender roles. These texts use the mujer varonil trope to portray their subjects in ways that communicate the limits for female agency. Simultaneously, the texts allow for some agency by praising certain forms of transition to a male identity by people identified as female at birth. The texts and genres explored in this dissertation thus raise important questions about socio-historic limits for normative gender expression in early modern Spain and Spanish America while also providing answers that resolve the ambiguities that they explore. They do this in ways that support the imperial project and the social stability necessary for its success. [1] The term mujer varonil is employed provisionally here. In the language of the times, the word mujer in most contexts did not include virgens. In further research, I plan to address this issue of terminology as it applies to the masculine female in the religious orders. That is outside the scope of this present work

Reflections on Elections in South Africa

Orlando Redekopp was an international observer of the 1994 South Africa General Election through the Ecumenical Monitoring Programme in South Africa (EMPSA). Authored by Redekopp, this narrative outlines his analysis of five reflections about the elections and the role of the church and Christians.https://digitalcommons.colum.edu/saelection/1011/thumbnail.jp

Models for strongly-nonlinear evolution of long internal waves in a two-layer stratification

International audienceModels describing the evolution of long internal waves are proposed that are based on different polynomial approximations of the exact expression for the phase speed of uni-directional, fully-nonlinear, infinitely-long waves in the two-layer model of a density stratified environment. It is argued that a quartic KdV model, one that employs a cubic polynomial fit of the separately-derived, nonlinear relation for the phase speed, is capable of describing the evolution of strongly-nonlinear waves with a high degree of fidelity. The marginal gains obtained by generating higher-order, weakly-nonlinear extensions to describe strongly-nonlinear evolution are clearly demonstrated, and the limitations of the quite widely-used quadratic-cubic KdV evolution model obtained via a second-order, weakly-nonlinear analysis are assessed. Data are presented allowing a discriminating comparison of evolution characteristics as a function of wave amplitude and environmental parameters for several evolution models

A weakly nonlinear model for multi-modal evolution of wind-generated long internal waves in a closed basin

A weakly nonlinear evolution model that accounts for multi-modal interaction in a small, continuously stratified lake of variable depth is derived. In particular, an evolution model for the first two vertical modes in a lake that is subject to wind stress forcing is numerically simulated. Defining modal energies, energy transfer between the first and the second vertical modes is calculated for several different forms of the density stratification. Modal energy transfer mainly occurs during reflection of mode-one waves at the vertical end walls, and it is shown that the amount of energy transfer from the first to the second mode is greatly dependent on the shape of the stratification profile. Also, the initial modal energy partition at the wind setup is shown to depend significantly on the penetration depth of the internal shear stress induced by the wind stress, especially if the stress distribution extends into the upper levels of the metalimnion

The problem of embodiment in Heidegger's fundamental ontology

Fundamental ontology is Heidegger's attempt to clarify the meaning of being through a descriptive analysis of human existence, which he conceives as a system of intentional relations that precedes the subject/object dichotomy. His interpretation of human being seems to promise an innovative solution to the problem of how we are corporeally immanent in nature at the same time as we transcend nature in our understanding. Yet Heidegger pays little attention to the problem of embodiment in fundamental ontology. This thesis addresses the question of what accounts for his neglect. In Chapter One, I formulate the problem in terms of Heidegger's ontological concepts. Chapter Two shows that despite appearances to the contrary, the problem of embodiment is crucial for fundamental ontology. Chapter Three develops the central claim of the thesis, which is that Heidegger neglects embodiment because to treat it adequately threatens to undermine the transcendental character of fundamental ontology

A numerical study of bifurcations in a barotropic shear flow

In the last few years, more and more evidence has emerged suggesting that transition to turbulence may be viewed as a succession of bifurcations to deterministic chaos. Most experimental and numerical observations have been restricted to Rayleigh-Benard convection and Taylor-Couette flow between concentric cylinders. An attempt is made to accurately describe the bifurcation sequence leading to chaos in a 2-D temporal free shear layer on the beta-plane. The beta-plane is a locally Cartesian reduction of the equations describing the dynamicss of a shallow layer of fluid on a rotating spherical planet. It is a valid model for large scale flows of interest in meteorology and oceanography

An Algebraic Framework for Stock & Flow Diagrams and Dynamical Systems Using Category Theory

Mathematical modeling of infectious disease at scale is important, but challenging. Some of these difficulties can be alleviated by an approach that takes diagrams seriously as mathematical formalisms in their own right. Stock & flow diagrams are widely used as broadly accessible building blocks for infectious disease modeling. In this chapter, rather than focusing on the underlying mathematics, we informally use communicable disease examples created by the implemented software of StockFlow.jl to explain the basics, characteristics, and benefits of the categorical framework. We first characterize categorical stock & flow diagrams, and note the clear separation between the syntax of stock & flow diagrams and their semantics, demonstrating three examples of semantics already implemented in the software: ODEs, causal loop diagrams, and system structure diagrams. We then establish composition and stratification frameworks and examples for stock & flow diagrams. Applying category theory, these frameworks can build large diagrams from smaller ones in a modular fashion. Finally, we introduce the open-source ModelCollab software for diagram-centric real-time collaborative modeling. Using the graphical user interface, this web-based software allows the user to undertake the types of categorically-rooted operations discussed above, but without any knowledge of their categorical foundations

Internal solitary waves in the Coastal Mixing and Optics 1996 experiment : multimodal structure and resuspension

Observations of internal solitary waves (ISWs) and of their role in sediment resuspension during the Coastal Mixing and Optics 1996 (CMO 96) experiment are reported. The largest resuspension events observed in the experiment can be related to retarded flow under the wave footprint. Two distinctly different periods of resuspension events could be distinguished based on the prevailing atmospheric conditions: a calm period, which we consider characteristic of nominal conditions, and an energetic period, during which two major storms occurred. ISWs arrived at the mooring site from a variety of sources, though a common intermodal dynamics seemed to occur repeatedly. Both mode 1 and mode 2 ISWs have been observed. The present analysis of the month-long portion of the CMO 96 data set constitutes the first reported observations, insofar as we are aware, of mode 2 waves on the continental shelf. Both mode 1 and mode 2 ISWs were found to stimulate resuspension. The mode 2 waves seem to be generated locally by resonant or topographic interactions with mode 1 ISWs. Internal wave fields of the type described here are expected to exist in a variety of other shallow seas as well