FAQ
FAQ
Open Access Blog
Open Access Blog
Policies
Policies

Introduction

Texas ScholarWorks was established to provide open, online access to the products of the University's research and scholarship, to preserve these works for future generations, to promote new models of scholarly communication, and to help deepen community understanding of the value of higher education.

UT Tower and campus image credit: Earl McGehee, CC-BY, https://www.flickr.com/photos/ejmc/7452145850

 

Communities in TSW

Select a community to browse its collections.

Recent Submissions

Item
Sense of belonging and first-generation Latinx students in Computer Science cohort-based transfer pathway programs
(2024-05) Gomez, Rosalia Arellano; Flores, Stella M.; Ellis, Martha M.; Goodman, Michael A; Rodriguez, Sarah L.
The increasing demand for a computationally trained workforce that reflects Latinx population growth in America has encouraged institutions to revisit exclusionary practices and develop initiatives that support Latinx undergraduate student persistence in Computer Science (CS). CS is necessary not only to keep pace with the rapid change in technology that drives innovation and sustains global economic competitiveness but also to create pathways that foster interest in scientific graduate education (Wofford, 2023). One of the key pathways to a CS degree for Latinx students, a majority of whom will be the first in their family to earn a bachelor’s degree, is through the upward transfer process from a community college to a four-year university. This qualitative, narrative study captured the lived experiences of seven first-generation Latinx undergraduate students persisting at two Hispanic-Serving Institutions and how they experienced a sense of belonging, a predictor of college success, with support from a CS cohort-based transfer pathway program. Findings reveal that these programs remove barriers to transfer, and “mutual belonging” and “dual belonging” are predictors of first-generation Latinx student persistence. Findings serve as a guide for collaborations to broaden participation in computing.
Item
Imaging of R3 profile of Chicxulub offshore seismic data using prestack split-stip Fourier migration in the plane wave domain
(2008) Aljadher; Stoffa, Paul L., 1948-
Sixty-five million years ago, a bolide approximately 10 km in diameter traveling over 20 km/sec collided with earth in the Yucatan Peninsula leaving behind the wide multi-ring Chicxulub crater. Two-dimensional (2D) marine seismic reflection data were acquired in 1996 and 2005 to image the crustal deformation. Radial line R3, a 100 km seismic reflection profile, was processed using a conventional seismic data processing flow (McDonald, MS Thesis, 2006). In this study, line R3 is processed using a different scheme using prestack split-step Fourier migration in the plane wave domain. This new seismic imaging of the R3 data collapses the scattered waves, moves the temporal reflection events to their true structural position in depth and increases the signal to noise ratio. The field shot gathers are contaminated with low-frequency guided waves due to the shallow water column and the hard water bottom offshore Yucatan as well as the Scholte waves propagating along the seafloor interface. A 2D normal derivative operator was applied to remove this coherent noise for NMO corrected data. This multichannel filtering approach attempts to reveal the horizontal or nearly-horizontal reflections while non-horizontal evenets such as groundroll and Scholte waves are attenuated. Before migration of the reflections, the seismic shot gathers were mapped from the offset-time (X-T) domain to the vertical delay time, τ, and the horizontal ray parameter, p, or simply τ-p domain. In the τ-p domain, predictive deconvolution often works better since multiples are periodic and hence easier to remove and this usually gives better results than applying the deconvolution in the original offset-time (X-T) domain. Moreover, groundroll and Scholte waves are mapped to points in the τ-p domain and there can then be readily excluded for the imaging, improving the signal to noise ratio of the final depth section. For depth migration, a good velocity model is required to image the data to the correct position and depth. Thus, an optimized velocity model was used for prestack plane wave migration. Prestack depth migration was applied directly on the transformed τ-p gathers that are sorted into constant ray parameter sections. Each plane wave component, i.e. constant p value, was imaged separately and prestack-migrated common-image-gathers (CIGs) are collected. They are in the depth and ray parameter z-p domain, at each shot position. The migrated and stacked results are obtained by stacking a selected range or all the traces in each CIG to generate the final image. Residual depth versus p "moveout" is then used to refine the interval velocity of the depth section. The result of this new processing is an improved image in depth of the crater which is important to understanding the actual structural geometry of this large impact event. The improved image can give a greater confidence in both the geologic structure and the velocity model than time migration since the events are now in their true spatial position
Item
Pre-stack inversion for porosity estimation from seismic data in an oil field, Eastern Saudi Arabia
(2008) AlMuhaidib, Abdulaziz Mohammad; Sen, Mrinal K.
The main objective of seismic inversion is to obtain earth model parameters from seismic reflection data. In other words, it is the process of determining what physical characteristics of rocks and fluids (i.e., P-impedance, shear impedance, and density) could have produced the seismic record. The aim of this study is to obtain reservoir properties, such as porosity both at the well locations and in the inter-well regions from seismic data and incorporated well logs. The target is a Jurassic carbonate reservoir from an oil field located to the East of Saudi Arabia. The purpose was to investigate the reliability of inferring the elastic properties (Zp, Zs, ρ) from seismic data in this field, and to build a geologic framework for flow simulation for better reservoir production forecasting and management. The seismic data were processed with special attention to preserving the true reflection amplitudes, and were time migrated before stack. Residual moveout from multiples after NMO, however, is almost horizontal at near offset, and constructively add to the stacked amplitude. Therefore, we applied a pre-stack inversion technique on the seismic data, after careful processing, including removal of residual internal multiples. Such an inversion incorporates all of the offsets to obtain an optimum acoustic impedance model. We also investigated the stability of inverting shear impedance and density in the field of study. The seismic inversion results were overall very good and stable for P-impedance. The match between borehole log and seismic impedance profiles was excellent for the high-contrast events and variable for the low contrast in acoustic impedance, depending on the location within the field. Inverted shear impedance results were less stable compared to P-Impedance, while density was totally unstable and has not been resolved. In general, areas of poor inversion coincided with the zones of poor quality seismic data. The borehole log data showed a good impedance-porosity relationship. The Raymer-Hunt-Gardner impedance-porosity empirical relation fits the borehole data very well. Thus, I used the Raymer-Hunt-Gardner relation, with coefficients for this field derived from the log data, to convert inverted acoustic impedance into a porosity model for the field. Based on the new quantitative seismic reservoir characterization, I was able to identify additional areas of potentially good reservoir quality
Item
Black newspapers in Texas, 1868-1970
(1972) Grose, Charles William; Davis, Norris G., -1981
This study presents a survey of more than 100 commercial, black newspapers in Texas from 1868 to 1970. General development and analysis of the newspapers are presented in four periods, with special attention given to a few of the more prominent media. Black newspapers, directories and interviews served as major sources of information for the investigation. Most of Texas' black newspapers have been urban weeklies whose economic condition has been unstable but gradually improving. Circulation revenue was an essential source of income for many black newspapers. Local advertising was a more important source of revenue than national advertising. While the majority of the pre-depression papers existed four years or less, the majority of the post-depression papers published for more than 10 years. In the 1960's the number of controlled circulation papers and tabloids increased. The dominant ownership pattern was the individual proprietorship, although a few of the papers were incorporated. Frequently one man functioned in the dual capacity of editor and publisher. In style and graphics, a moderate approach to news presentation dominated Texas' black papers until the 1920's. But by the 1920's, crime and interracial violence were given extensive front-page coverage and displayed with banner headlines in some of Texas' black papers. News stories have been unapologetically slanted to black interests, phraseology and vocabulary. A refinement expression increasingly developed. Black unity, pride and advancement were among the continuous themes emphasized in the papers. After 1930, the number of central topics noticeably increased. They included black history and empowerment of lower-income blacks. Texas' black papers played a major role in the black man's civil rights struggle, generally taking forthright political stands. Pre-depression newspapers were usually Republican, whereas most post-depression papers were politically independent. These media led crusades which resulted in admission of blacks to the University of Texas Law School and black participation in primary elections. On the whole, Texas' black newspapers were more functional than dysfunctional, particularly to the black community in maintenance of social networks and the adaptation of groups to the total American social system. Papers communicated norms, values, attitudes and images with which the reader could identify. Empathy was also multiplied by the media. While social-responsibility characteristics were consistently more prevalent. In terms of integration-separatism and accommodation-protest sets of polarities, Texas' black papers consistently stressed integration and protest. Although these media were increasingly Afro-American in emphasis, black bourgeoisie tendencies predominated. This newspaper study discloses new sources for research in black history. A directory of black newspapers published in Texas is included
Item
Walter Ducloux Collection finding aid
(2024-06-11) Fine Arts Library staff
Fiinding aid for the collection -- About the collection