Topographically forced long waves on a sheared coastal current. Part 2. Finite amplitude waves

This paper analyses the finite-amplitude flow of a constant-vorticity current past coastal topography in the long-wave limit. A forced finite-amplitude long-wave equation is derived to describe the evolution of the vorticity interface. An analysis of this equation shows that three distinct near-critical regimes occur. In the first the upstream flow is restricted, with overturning of the vorticity interface for sufficiently large topography. In the second quasi-steady nonlinear waves form downstream of the topography with weak upstream influence. In the third regime the upstream rotational fluid is partially blocked. Blocking and overturning are enhanced at headlands with steep rear faces and decreased at headlands with steep forward faces. For certain parameter values both overturning and partially blocked solutions are possible and the long-time evolution is critically dependent on the initial conditions. The reduction of the problem to a one-dimensional nonlinear wave equation allows solutions to be followed to much longer times and parameter space to be explored more finely than in the related pioneering contour-dynamical integrations of Stern (1991)

Topographically forced long waves on a sheared coastal current. Part 1. The weakly nonlinear response

The flow of a constant-vorticity current past coastal topography is investigated in the long-wave weakly nonlinear limit. In contrast to other near-critical weakly nonlinear systems this problem does not exhibit hydraulically controlled solutions. It is shown that near criticality the evolution of the vorticity interface is governed by a forced BDA (Benjamin-Davis-Acrivos) equation. The solutions of this equation are discussed and two distinct near-critical flow regimes are identified. Owing to the non-local nature of the forcing, the first of these regimes is characterized by quasi-steady solutions controlled at the topography with some blocking of the upstream rotational fluid, while in the second regime steady nonlinear wavetrains form downstream of the obstacle with no upstream influence. In the hydraulic limit the velocity band for both of these critical regimes approaches zero

Optical tomography using the SCIRun problem solving environment: Preliminary results for three-dimensional geometries and parallel processing

We present a 3D implementation of the UCL imaging package for absorption and scatter reconstruction from time-resolved data (TOAST), embedded in the SCIRun interactive simulation and visualization package developed at the University of Utah. SCIRun is a scientific programming environment that allows the interactive construction, debugging, and steering of large-scale scientific computations. While the capabilities of SCIRun's interactive approach are not yet fully exploited in the current TOAST implementation, an immediate benefit of the combined TOAST/SCIRun package is the availability of optimized parallel finite element forward solvers, and the use of SCIRun's existing 3D visualisation tools. A reconstruction of a segmented 3D head model is used as an example for demonstrating the capability of TOAST/SCIRun of simulating anatomically shaped meshes

Harold Clarke Johnson Papers - Accession 575

The Harold Clarke Johnson Papers mainly pertains to York County history and includes deeds, titles, bonds, county expenses, tax, and treasurer reports, and annual reports of the treasurer of York County to the state Superintendent of Education, and of the York County Treasurer. These records relate to the financial affairs of York County between 1889 and 1910 and offers a great insight into the finances of the county during that timeframe. The material was collected by the York (South Carolina) Historical American Bicentennial. Of special interest, is a brief history of an 1820 map of York County, written by Harold Clarke, Sr. (1913-1993), member of York (South Carolina) Bicentennial Committee, and a historical sketch of York County (1976) prepared by the York County Historical Commission.https://digitalcommons.winthrop.edu/manuscriptcollection_findingaids/1689/thumbnail.jp

HYBRID PARALLELIZATION OF THE NASA GEMINI ELECTROMAGNETIC MODELING TOOL

Understanding, predicting, and controlling electromagnetic field interactions on and between complex RF platforms requires high fidelity computational electromagnetic (CEM) simulation. The primary CEM tool within NASA is GEMINI, an integral equation based method-of-moments (MoM) code for frequency domain electromagnetic modeling. However, GEMINI is currently limited in the size and complexity of problems that can be effectively handled. To extend GEMINI’S CEM capabilities beyond those currently available, primary research is devoted to integrating the MFDlib library developed at the University of Kentucky with GEMINI for efficient filling, factorization, and solution of large electromagnetic problems formulated using integral equation methods. A secondary research project involves the hybrid parallelization of GEMINI for the efficient speedup of the impedance matrix filling process. This thesis discusses the research, development, and testing of the secondary research project on the High Performance Computing DLX Linux supercomputer cluster. Initial testing of GEMINI’s existing MPI parallelization establishes the benchmark for speedup and reveals performance issues subsequently solved by the NASA CEM Lab. Implementation of hybrid parallelization incorporates GEMINI’s existing course level MPI parallelization with Open MP fine level parallel threading. Simple and nested Open MP threading are compared. Final testing documents the improvements realized by hybrid parallelization

An Examination of Traditional and Non-Traditional African American Male Students\u27 Perceptions of the Community College Environment, Their Quality of Effort, Gains, and Inclination to Persist.

African American males at community colleges are facing greater challenges regarding persistence in today’s higher education environment. Several studies address institutional retention efforts of African Americans at 4-year institutions; however, a significant gap exists of research concerning African American male students\u27 persistence efforts within the community colleges setting. This study assist policy makers, higher education administrators, institutional researchers, and program directors in regards to best practices of programs that promote student persistence at the community college level. Guided by C. Robert Pace’s “Quality of Student Effort” theory, this study was conducted to examine the differences among traditional and non-traditional African American male students’ perceptions of the community college environment, their quality of effort, gains, and inclination to persist. Several statistical procedures were conducted to analyze a national data aggregate of the Community College Student Experiences Questionnaire (CCSEQ) acquired from the Center for the Study of Higher Education (CSHE) at the University of Memphis. A secondary data analysis was conducted among 1,948 student respondents from 8 community colleges that responded to the electronic version of the questionnaire during the academic years 2010-2013. To address the five research questions presented within this study, the Statistical Package for the Social Sciences (SPSS) was used to conduct multiple analyses that addressed four groups of dependent variables (perceptions of the college environment, student quality of effort, students’ perceived estimate of gains, and an index of students’ inclination to persist). The independent variables were traditional and non-traditional African American male community college students. Results indicate that significant differences exist in the responses of the community college sample. Amongst the four groups of dependent variables, the most notable difference is the affinity of traditional aged students’ and their perceptions of the college environment. Differences among traditionally aged and non-traditional African American male community college students were also observed regarding students’ perceived quality of effort, their estimates of gains and their inclination to persist at the community college level

Organization of the Public Schools in Houston, Texas, 1905-1940

The problem of this study is to determine the answer to the question, namely: What are the types of organization of Public Education which Houston has used, 1905-1940? To solve this problem the writer has attempted answers to the following more specific questions which are: 1. What are certain geographical, industrial, social, and religious facts concerning the City of Houston, Texas which may aid the reader to better understand the setting? 2. What historical developments have influenced the beginning of public Education in Houston? 3. what have been the outstanding characteristics of organization of the Public Schools in Houston since 1905? These data used in succeeding pages were secured from the Houston Chamber of Commerce, the Texas City Schools, student and teacher handbooks, and census bulletins. These sources are indicated in the footnotes and the bibliography

Streak camera receiver definition study

Detailed streak camera definition studies were made as a first step toward full flight qualification of a dual channel picosecond resolution streak camera receiver for the Geoscience Laser Altimeter and Ranging System (GLRS). The streak camera receiver requirements are discussed as they pertain specifically to the GLRS system, and estimates of the characteristics of the streak camera are given, based upon existing and near-term technological capabilities. Important problem areas are highlighted, and possible corresponding solutions are discussed

Expression data from primary culture human myometrial cells

Inflammation plays a central role in many human diseases. Human parturition also resembles an inflammatory reaction, where progesterone (P4) and progesterone receptors (PRs) have already been demonstrated to suppress contraction-associated gene expression. In our previous studies, we have found that the progesterone actions, including progesterone-induced gene expression and progesterone's anti-inflammatory effect, are mediated by PR, GR or both. In this study, we used microarrays (GSE68171) to find P4 and IL-1β responsive genes and IL-1β responsive genes which were repressed by P4. These data may provide a broader view of gene networks and cellular functions regulated by P4 and IL-1β in human myometrial cells. These data will also help us understand the role of PR and GR in human parturition