Phases of a Man Called \u27Moon\u27: Mayor Landrieu and Race Relations in New Orleans, 1960-1974

This study examines the political career of Maurice Edwin Moon Landrieu from his election to the Louisiana legislature in 1960 to the end of his first term as mayor of New Orleans in 1974. Landrieu was a white southern liberal who vigorously supported the agenda of the civil rights movement. He succeeded in building an unprecedented coalition between liberal, middle-class whites and a large segment of the black community. As the 1970s unfolded, however, he found his coalition increasingly threatened not just by disgruntled white conservatives, which might be expected, but also by angry black radicals of the Black Panther Party. This study argues that Landrieu\u27s firm commitment to opening up political and economic opportunity to all citizens enabled him to keep his progressive, biracial coalition together and to help pave the way for the 1978 election of Ernest Dutch Morial, the first black mayor of New Orleans

Solving Nonlinear Parabolic Equations by a Strongly Implicit Finite-Difference Scheme

We discuss the numerical solution of nonlinear parabolic partial differential equations, exhibiting finite speed of propagation, via a strongly implicit finite-difference scheme with formal truncation error $\mathcal{O}\left[(\Delta x)^2 + (\Delta t)^2 \right]$. Our application of interest is the spreading of viscous gravity currents in the study of which these type of differential equations arise. Viscous gravity currents are low Reynolds number (viscous forces dominate inertial forces) flow phenomena in which a dense, viscous fluid displaces a lighter (usually immiscible) fluid. The fluids may be confined by the sidewalls of a channel or propagate in an unconfined two-dimensional (or axisymmetric three-dimensional) geometry. Under the lubrication approximation, the mathematical description of the spreading of these fluids reduces to solving the so-called thin-film equation for the current's shape $h(x,t)$. To solve such nonlinear parabolic equations we propose a finite-difference scheme based on the Crank--Nicolson idea. We implement the scheme for problems involving a single spatial coordinate (i.e., two-dimensional, axisymmetric or spherically-symmetric three-dimensional currents) on an equispaced but staggered grid. We benchmark the scheme against analytical solutions and highlight its strong numerical stability by specifically considering the spreading of non-Newtonian power-law fluids in a variable-width confined channel-like geometry (a "Hele-Shaw cell") subject to a given mass conservation/balance constraint. We show that this constraint can be implemented by re-expressing it as nonlinear flux boundary conditions on the domain's endpoints. Then, we show numerically that the scheme achieves its full second-order accuracy in space and time. We also highlight through numerical simulations how the proposed scheme accurately respects the mass conservation/balance constraint.Comment: 36 pages, 9 figures, Springer book class; v2 includes improvements and corrections; to appear as a contribution in "Applied Wave Mathematics II

An Examination of Morphometric Variations in a Neotropical Toad Population (Proceratophrys cristiceps, Amphibia, Anura, Cycloramphidae)

The species Proceratophrys cristiceps belongs to the genus Proceratophrys within the family Cycloramphidae. These amphibians are found exclusively in South America in the morphoclimatic domain of the semi-arid depression zones in northeastern Brazil known as the Caatinga. We examined intrapopulational variation using univariate and multivariate statistics with traditional and geometric morphometrics, which supported the existence of two morphotypes of this species. Our results indicated significant degrees of variation in skeletal characteristics between some natural populations of this species. Careful analyses of variability levels are fundamental to avoid taxonomic errors, principally in populations that demonstrate characteristics intimately associated with their area of occurrence, as is the case of Proceratophrys cristiceps

Phases of a Man Called \u27Moon\u27: Mayor Landrieu and Race Relations in New Orleans, 1960-1974

This study examines the political career of Maurice Edwin Moon Landrieu from his election to the Louisiana legislature in 1960 to the end of his first term as mayor of New Orleans in 1974. Landrieu was a white southern liberal who vigorously supported the agenda of the civil rights movement. He succeeded in building an unprecedented coalition between liberal, middle-class whites and a large segment of the black community. As the 1970s unfolded, however, he found his coalition increasingly threatened not just by disgruntled white conservatives, which might be expected, but also by angry black radicals of the Black Panther Party. This study argues that Landrieu\u27s firm commitment to opening up political and economic opportunity to all citizens enabled him to keep his progressive, biracial coalition together and to help pave the way for the 1978 election of Ernest Dutch Morial, the first black mayor of New Orleans

Long-term records of strontium isotopic composition in tree-rings suggest changes in forest calcium sources in the early 20th century

FLWINinfo:eu-repo/semantics/publishe