Digital Commons Network^™

Recent Applications Of Fractional Calculus To Science And Engineering, Lokenath Debnath

School of Mathematical & Statistical Sciences Faculty Publications

This paper deals with recent applications of fractional calculus to dynamical systems in control theory, electrical circuits with fractance, generalized voltage divider, viscoelasticity, fractional-order multipoles in electromagnetism, electrochemistry, tracer in fluid flows, and model of neurons in biology. Special attention is given to numerical computation of fractional derivatives and integrals.

The Collegian (2002-12-02), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 14

Attitudes Of Migrant Receiving And Home District Teachers And The Academic Successes Of Migrant Children, Martha Alicia Cantu

Theses and Dissertations - UTB/UTPA

The purpose of this research was to investigate the attitudes of teachers in receiving and home districts toward migrant students and measure the academic achievement of migrant students. The study also serves the purpose of accessing the preparation needs of teachers who work with migrant students.

The instrument used to gather the attitudinal data from 215 receiving and home district teachers was the Migrant Education Survey . The surveys were mailed or delivered to the receiving and home district migrant teachers. Initially, 125 migrant students were selected as participants for the study. However, only 77 were used in the final …

Texas School Finance Equalization And Student Performance, Christopher Duque

Theses and Dissertations - UTB/UTPA

The thesis examines which factors or school district inputs, i.e., financial, socio-economic, and administrative have a significant effect on student performance in Texas' school districts. The thesis is divided into five chapters, the introduction and the legal history of school finance reform, the history of Texas school finance policies and the current school finance policy, the literature review, the hypothesis and methodology, and the findings and conclusion of the thesis. The percentage of economically disadvantaged students was found to be significantly related to student performance in the thesis. And the thesis concludes that the state's school finance equalization policy has …

Alignment, Mechanical And Thermo-Physical Characterization Of Nanofiber-Reinforced Polyethylene, Veronica M. Diaz-Serrato

Theses and Dissertations - UTB/UTPA

Alignment of vapor grown carbon nano-reinforced polyethylene composites was performed using conventional extrusion processing methods. The alignment of the nanofibers within polyethylene, PE; the matrix, produced a material with anisotropic behavior. Mechanical and thermo-physical properties of the nanocomposite were studied. Enhancements in mechanical properties were investigated for pure PE, misaligned, and aligned specimens for stress versus strain, maximum load, and Young's modulus as high as 185, 273, and 80%, respectively. In fact, toughness was considerably high for the 10 rpm specimen when compared to other samples of different windup speeds. Thermo-physical studies were performed using differential scanning calorimetry (DSC) and …

Switching Decisions For Diversity Antennas Using Autoregressive Techniques, Sebastian Mani Puthenpurayil

Theses and Dissertations - UTB/UTPA

Decision-making on switching for diversity antennas has been given considerable attention in recent times in mobile radio communications. Due to multipath propagation of radio waves the signals undergo a phenomenon known as fading and there will be considerable reduction in the average signal strength. By having multiple antennas in the receiver or transmitter the signal strength can be improved by switching back and forth to the antenna that has the maximum signal strength. In this thesis we have used linear prediction method for making decisions on which antenna gives the maximum signal strength. Linear prediction is applied on a single …

The Collegian (2002-11-18), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 13

The Pan American (2002-11-14), Matt Lynch

UTPA Archives - The Pan American Newspaper

51st Year, No. 12

The Collegian (2002-11-11), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 12

The Pan American (2002-11-07), Matt Lynch

UTPA Archives - The Pan American Newspaper

51st Year, No. 11

The Collegian (2002-11-04), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 11

Horizontal-Branch Morphology And The Photometric Evolution Of Old Stellar Populations, Hyun Chul Lee, Young Wook Lee, Brad K. Gibson

Physics & Astronomy Faculty Publications

Theoretical integrated broadband colors ranging from far-UV to near-IR have been computed for old stellar systems from our evolutionary population synthesis code. These models take into account, for the first time, the detailed systematic variation of horizontal-branch (HB) morphology with age and metallicity. Our models show that some temperature-sensitive color indices are significantly affected by the presence of blue HB stars. In particular, B-V does not become monotonically redder as metallicity increases at given ages, but becomes bluer by as much as ∼0.15 mag because of the contribution from blue HB stars. Similar trends are also found in the Washington …

The Collegian (2002-10-28), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 10

The Collegian (2002-10-21), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 9

The Pan American (2002-10-17), Matt Lynch

UTPA Archives - The Pan American Newspaper

51st Year, No. 8

The Collegian (2002-10-14), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 12

The Collegian (2002-10-07), John Strubelt

UTB/TSC Archives - The Collegian [Newspaper]

Vol. 55, No. 7

Utpa Commencement – Fall 2002, University Of Texas-Pan American

Edinburg Archives - Legacy Commencement Programs

No abstract provided.

The Pan American (2002-08-29), Matt Lynch

UTPA Archives - The Pan American Newspaper

51st Year, No. 1

Orange & White - Summer 2002, University Of Texas At Brownsville, Texas Southmost College

UTB/TSC Archives - Orange & White Magazine

No abstract provided.

The Pan American (2002-06-13), Matt Lynch

UTPA Archives - The Pan American Newspaper

50th Year, No. 27

Equilibrium Shapes Of Flat Knots, Ralf Metzler, Andreas Hanke, Paul G. Dommersnes, Yacov Kantor, Mehran Kardar

Physics & Astronomy Faculty Publications

The equilibrium shapes of prime and composite knots were studied. It was showed that the topological details of prime knots were localized on a small portion of the larger ring polymer due to self-avoiding effects. The original knot configuration could assume a hierarchy of contracted shape, the dominating one given by one small loop, within this region. For the flat trefoil knot, this hierarchy was studied in detail and corroborated by Monte Carlo simulations.

Retention Of Beginning Teachers: A Comparison Of Teachers Prepared Through An Alternative Certification Program And A Center For Professional Development Of Teachers Field-Based Program, Glendelia Muniz Zavala

Theses and Dissertations - UTB/UTPA

Teacher retention has been a matter of concern for the past several years. Teacher shortages occur in critical academic and geographic regions. In South Texas, teacher turnover has consistently remained higher than the national average. More importantly is a high attrition rate among beginning teachers. Recent studies reported that 19% of novice teachers leave teaching after the first year and approximately 50% leave the profession within the first five years of teaching. Numerous studies have investigated various factors that contribute to teacher attrition, however, few have been conducted to determine the impact of teacher preparation paths on the retention of …

The Rheological Behavior Of Carbon Nanofiber-Reinforced Thermoplastic Composites, Qiang Zeng

Theses and Dissertations - UTB/UTPA

A rheological study of the thermoplastic HDPE filled with vapor grow carbon nanofiber (VGCNF) has been performed with a RheoStress 150 Tester. VGCNF having average 50 nm diameter were used. These nanofibers were purified to provide for an open network of high purity nanofibers. A rheomixer was used to disperse the nanofibers uniformly in the polyethylene matrix because of shear working conditions. The influence of fiber loading, frequency and temperature on the rheology was investigated. Studies were carried out in the temperature range of 160 to 210°C and frequency range of 0.062 to 628.3 rad/s. The rheological measurements show that …

Dna Polymerase Iii Holoenzyme From Thermus Thermophilus Identification Expression Purification Of Components And Use To Reconstitute A Processive Replicase, James M. Bullard, Jennifer C. Williams, Wendy K. Acker, Carsten Jacobi, Nebojsa Janjic, Charles S. Mchenry

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)

DNA replication in bacteria is performed by a specialized multicomponent replicase, the DNA polymerase III holoenzyme, that consist of three essential components: a polymerase, the β sliding clamp processivity factor, and the DnaX complex clamp-loader. We report here the assembly of the minimal functional holoenzyme from Thermus thermophilus (Tth), an extreme thermophile. The minimal holoenzyme consists of α (pol III catalytic subunit), β (sliding clamp processivity factor), and the essential DnaX (τ/γ), δ and δ′ components of the DnaX complex. We show with purified recombinant proteins that these five components are required for rapid and processive DNA synthesis …

A Three-Domain Structure For The Delta Subunit Of The Dna Polymerase Iii Holoenzyme Delta Domain Iii Binds Delta' And Assembles Into The Dnax Complex, James M. Bullard, Arthur E. Pritchard, Min Sun Song, Bradley P. Glover, Anna Wieczorek, Joe Chen, Nebojsa Janjic, Charles S. Mchenry

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)

Using ψ-BLAST, we have developed a method for identifying the poorly conserved δ subunit of the DNA polymerase III holoenzyme from all sequenced bacteria. This approach, starting withEscherichia coli δ, leads not only to the identification of δ but also to the DnaX and δ′ subunits of the DnaX complex and other AAA⁺-class ATPases. This suggests that, although not an ATPase, δ is related structurally to the other subunits of the DnaX complex that loads the β sliding clamp processivity factor onto DNA. To test this prediction, we aligned δ sequences with those of δ′ and, using …

Utpa Commencement – Spring 2002, University Of Texas-Pan American

Edinburg Archives - Legacy Commencement Programs

No abstract provided.

Utb/Tsc Commencement – Spring 2002, University Of Texas At Brownsville, Texas Southmost College

Brownsville Archives - Legacy Commencement Programs

No abstract provided.

Orange & White - Spring 2002, University Of Texas At Brownsville, Texas Southmost College

UTB/TSC Archives - Orange & White Magazine

No abstract provided.

The Pan American (2002-03-07), Matt Lynch

UTPA Archives - The Pan American Newspaper

50th Year, No. 21