Exact solutions of Dirac equation on a 2D gravitational background

We obtain classes of two dimensional static Lorentzian manifolds, which through the supersymmetric formalism of quantum mechanics admit the exact solvability of Dirac equation on these curved backgrounds. Specially in the case of a modified supersymmetric harmonic oscillator the wave function and energy spectrum of Dirac equation is given explicitly.Comment: 10 pages, title changed, content reduced, some references removed, To be published in PL

Boulware Family Papers - Accession 102

The Boulware Family Papers consist of photocopies of a plantation journal (302 pages) kept by Thomas McCullough Boulware I (1829-1889) and a genealogy of the Boulware family written by James Richmond Boulware II of Lakeland, Florida, in 1948. The journal concerns the Blackstocks Plantation in Chester County, South Carolina and subjects include the planting of crops and farming of land; family events, such as deaths, births and marriages; family travel and vacations; church affairs, including the local temperance league; land sales; free black and northerners in Chester County after the Civil War.https://digitalcommons.winthrop.edu/manuscriptcollection_findingaids/1056/thumbnail.jp

Current commutator anomalies in finite-element quantum electrodynamics

Four-dimensional quantum electrodynamics has been formulated on a hypercubic Minkowski finite-element lattice. The equations of motion have been derived so as to preserve lattice gauge invariance and have been shown to be unitary. In addition, species doubling is avoided due to the nonlocality of the interactions. The model is used to investigate the lattice current algebra. Regularization of the current is shown to arise in a natural and nonarbitrary way. The commutators of the lattice current are calculated and shown to have the expected qualitative behavior. These lattice results are compared to various continuum calculations. (Five figures available from author.)Comment: 15, OKHEP-93-1

High School Literacy Coaches In Florida: A Study Of Background, Time, And Other Factors Related To Reading Achievement

The goal of this research was to understand the work lives of literacy coaches in central Florida by studying who they were, what they did, and what they believed influenced student achievement. In addition, it was important to understand the perceptions of literacy coaches as to what factors influenced positive changes in student achievement. Of 27 central Florida literacy coaches, this study examined the academic and professional background of each coach, explored the time spent on ten key literacy coaching activities, and analyzed work factors related to student achievement in reading on the Florida Comprehensive Assessment Test. Although the literacy coaching role was one that was expanding in the United States through state funding initiatives, much about the role and its effectiveness were not known through the literature. A web-based survey system and purposive interviews were used to gather important data relevant to providing understandings about literacy coaches. Exploratory regression analyses using coaching activities and school performance measures were run to determine the existence of relationships. Qualitative analysis was employed to develop literacy coaching themes from survey responses, and all data were triangulated and used to develop case studies. Case studies provided narrative descriptions of all data in the context of individual schools and their coaches all embedded within case types as identified by prior year school letter grade. The results of the study showed an overwhelming amount of time was spent on other activities not related to literacy coaching. Assisting with test preparation was one reason for other activity assignment. Modeling of literacy strategies was reported as one of the more useful and influential activities, but few of the coaches in the study organized their time for this. Case studies provided rich context into the work lives of literacy coaches. Suggested uses for the study included the development of stronger professional development programs for school administrators in working with high school literacy coaches. Although literacy coaches were a well-trained group, more specific training is needed in the re-allocation of time so that more influential activities are pursued

Some Interesting Properties of Field theories with an Infinite Number of Fields

We give an indication that gravity coupled to an infinite number of fields might be a renormalizable theory. A toy model with an infinite number of interacting fermions in four-dimentional space-time is analyzed. The model is finite at any order in perturbation theory. However, perturbation theory is valid only for external momenta smaller than $\lambda ^{-\frac{1}{2}}$ , where $\lambda$ is the coupling constant.Comment: 12 pages, LaTe

PLANNING FOR RESILIENT COASTAL COMMUNITIES: AN ANALYSIS OF COASTAL PLANS IN SOUTH CAROLINA

Resilience is very important to the longevity of inhabited coastal regions. Sea level rise threatens human systems and exacerbates erosion, saltwater intrusion and flooding in coastal regions. Planning for resilience is one way to ensure that coastal communities are prepared for and able to persist through hazardous events, both ongoing and intermittent. This research amasses resilience policies in four categories: ecological, land uses, social, and economic, which reflect concepts of social-ecological resilience. These policies were selected based on their applicability to coastal regions and academic consensus on best practices to increase resilience. These policies were combined in a matrix that can be used in the planning discipline to assess resilience incorporation in coastal planning documents. Four coastal counties in South Carolina and two cities from each of those four counties were used as case studies to test the matrix. The results revealed a great need for South Carolina think more comprehensively in terms of the needs and priorities of its coastal region

Cosmological Solutions of Higher-Curvature String Effective Theories with Dilatons

We study the effect of higher-curvature terms in the string low-energy effective actions on the cosmological solutions of the theory, up to corrections quartic in the curvatures, for the bosonic and heterotic strings as well as the type II superstring. We find that cosmological solutions exist for all string types but they always disappear when the dilaton field is included, a conclusion that can be avoided if string-loop effects are taken into account.Comment: 7 pages, plain Tex with panda.tex macro (included), no figure

A Methodology for the Robust Procedure Development of Fillet Welds

Though Gas Metal Arc Welding has been a basic component of fabrication in manufacturing over the last half-century, a standard methodology for optimizing welding procedures is lacking. A new procedure development method which minimizes trial runs, while maximizing accuracy has been recently developed by T.T. Allen, et al, in 2002. The use of the method is presently restricted to lap joint type welds. This work looked to extend this methodology to the application of fillet welds, test its effectiveness with different response variables, and study the effect of increasing the number of response variables. The development of a robust weld procedure that produces a consistent root penetration was used as the application for the developed methodology. The significance of this application lies in the fact that typical codes and standards currently give no consideration to root penetration when calculating joint strength from a lack of confidence in consistency and robustness. The benefits of incorporating penetration in strength calculations are numerous and consequential for industry. An increase in strength would result allowing welds to be made smaller, thus, resulting in decreases in weld time, filler wire used, and heat input, reducing distortion. Showing the capability of robust penetration through this statistical process procedure is the first step towards inclusion of penetration as a variable in joint strength calculations and the reaping of its benefits. Fillet welds were made on 12 mm thick A572 Grade 50 steel and cross-sectioned to allow for the critical response variables of penetration, undercut, convexity, maximum and minimum leg length, to be measured. Regression models were created along with contour plots displaying penetration and quality ratings on a plot of WFS/TS ratio versus travel speed. The optimization of travel speed against penetration and quality restrictions was also performed revealing a set of nominal procedural variables which produce sound welds for a range of noise variables. The optimized welding procedure included a travel speed of 11.3 in/min, a 1/16” arc length, a WFS/TS ratio of 28.4, and a contact-tip-to-work distance of 22 mm. The low travel speed resulted primarily from a need to maintain a minimum leg length in specification. It was also, observed from the contour plots that the robustness of the process was low from both the minimum leg length and convexity quality response factors. While the application conclusions show low robustness results, the significance of the developments with the process procedure were significant. The combination of optimization and the contour plots provides the engineer with a tool for determining the nominal input welding variables along with gaining an understanding of the robustness of the certain procedure, according to each significant quality issue. Also, the development of a rating scale based on code adds authenticity to the procedure, while at the same time increasing the ease at which the common scale is developed.John Deere Dubuque Work

Electrodynamics in accelerated frames revisited

Maxwell's equations are formulated in arbitrary moving frames by means of tetrad fields, which are interpreted as reference frames adapted to observers in space-time. We assume the existence of a general distribution of charges and currents in an inertial frame. Tetrad fields are used to project the electromagnetic fields and sources on accelerated frames. The purpose is to study several configurations of fields and observers that in the literature are understood as paradoxes. For instance, are the two situations, (i) an accelerated charge in an inertial frame, and (ii) a charge at rest in an inertial frame described from the perspective of an accelerated frame, physically equivalent? Is the electromagnetic radiation the same in both frames? Normally in the analysis of these paradoxes the electromagnetic fields are transformed to (uniformly) accelerated frames by means of a coordinate transformation of the Faraday tensor. In the present approach coordinate and frame transformations are disentangled, and the electromagnetic field in the accelerated frame is obtained through a frame (local Lorentz) transformation. Consequently the fields in the inertial and accelerated frames are described in the same coordinate system. This feature allows the investigation of paradoxes such as the one mentioned above.Comment: 17 pages, no figure