Digital Commons Network^™

Potential Use Of Nitrogen-15 To Assess Nitrogen Sources And Fate In Narragansett Bay, Joaquin E. Chaves

Open Access Dissertations

Anthropogenic N inputs have been identified as the main source of N to Narragansett Bay, a relatively well-mixed estuary in the northeast coast of the United States. Despite a well constrained N budget high levels of primary production during the summer months, mostly in the form of sporadic "blooms", cannot be explained in terms of current budget estimates. Inputs from the adjacent Rhode Island Sound have been invoked as a potential source of N to account for the Bay's summer production. The dissolved inorganic nitrogen (DIN) from the Rhode Island Sound and the anthropogenic N entering the estuary through the …

Global Behavior Of Nonlinear Difference Equations, Cathy Ann Clark

Open Access Dissertations

We investigate the global asymptotic stability, the periodic nature, the rate of convergence, and the bounded character of solutions of two rational difference equations and a system of rational equations. We analyze the behavior of solutions of the equation [special characters omitted]with non-negative parameters and non-negative initial conditions. This is a special case of the more general equation [special characters omitted]and is one of the first third order rational difference equations to be investigated in which all three terms are present in the equation. A thorough analysis of a specific period-two pathology of solutions for the case A = 0 …

Prolegomenon To The Literary Study Of Hypertext, Edward Steven Shear

Open Access Dissertations

This dissertation is intended as contribution to the development of a framework and methodology for the literary study of hypertext. Its first purpose is to analyze the term "hypertext" and related keywords in respect to their widely varying usages in multiple disciplines to provide required clarification to identify the object of study in literary hypertext studies. The second purpose of the study is to propose a framework by which pre-computer literary works may be examined in relationship to the contemporary form of hypertext. These two goals work hand-in-hand to provide a groundwork of a literary history of hypertext. The first …

Acer 2003-2004 Annual Report, Australian Council For Educational Research (Acer)

ACER Annual Reports

No abstract provided.

The Pervasive Impact Of Information Technology On Internal Auditing, Sridhar Ramamoorti, Marcia L. Weidenmier

Books and Book Chapters by University of Dayton Faculty

The impetus for this supplemental chapter titled The Pervasive Impact of Information Technology on Internal Auditing comes from The Institute of Internal Auditors Research Foundation (IIARF) monograph, Research Opportunities in Internal Auditing (2003), hereafter ROIA. ROIA combines theory and practice in conceptual frameworks to promote an understanding of the contemporary internal auditing environment. The goals of ROIA include stimulating academic research on significant internal auditing topics and serving as a “communication bridge” between academics and practicing professionals.

ROIA provided us with internal auditing related subject matter content, including the most promising areas of information technology (IT) application in internal auditing. …

Analysis Of A Multigrid Algorithm For Time Harmonic Maxwell Equations, Jay Gopalakrishnan, Joseph E. Pasciak, Leszek Demkowicz

Mathematics and Statistics Faculty Publications and Presentations

This paper considers a multigrid algorithm suitable for efficient solution of indefinite linear systems arising from finite element discretization of time harmonic Maxwell equations. In particular, a "backslash" multigrid cycle is proven to converge at rates independent of refinement level if certain indefinite block smoothers are used. The method of analysis involves comparing the multigrid error reduction operator with that of a related positive definite multigrid operator. This idea has previously been used in multigrid analysis of indefinite second order elliptic problems. However, the Maxwell application involves a nonelliptic indefinite operator. With the help of a few new estimates, the …

Decentralized Control Of Vehicle Formations, Gerardo Lafferriere, Anca Williams, John S. Caughman Iv, J. J. P. Veerman

Mathematics and Statistics Faculty Publications and Presentations

This paper investigates a method for decentralized stabilization of vehicle formations using techniques from algebraic graph theory. The vehicles exchange information according to a pre-specified communication digraph, G. A feedback control is designed using relative information between a vehicle and its in-neighbors in G. We prove that a necessary and sufficient condition for an appropriate decentralized linear stabilizing feedback to exist is that G has a rooted directed spanning tree. We show the direct relationship between the rate of convergence to formation and the eigenvalues of the (directed) Laplacian of G. Various special situations are discussed, including …

Geodatabase Use In Fire Sciences Research| The Development Lifecycle, Lee T. Macholz

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Michelangelo And Leonardo| The Frescoes For The Palazzo Vecchio, Paula Rae Duncan

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

The Effects Of Environmentally Relevant Doses Of Perchlorate (Clo4-) On Rana Pipiens Metamorphosis And Development, Andrea N. Golli

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to assess the effects of environmentally relevant concentrations of perchlorate on the development and growth of Rana pipiens. Ammonium perchlorate is a rocket fuel oxidizer that is known to interfere with the function of the thyroid gland and some of the highest United States surface water concentration exists in the Las Vegas Wash, NV. Perchlorate not only blocks the body’s ability to incorporate iodine into T3 and T4 hormones through the sodium iodine symporter system, but also depletes the thyroid glands’ internal stores of iodine. Many of the steps that regulate metamorphosis in amphibians …

Superior 5' Homogeneity Of Rna From Atp-Initiated Transcription Under The T7 Φ2.5 Promoter, Tricia M. Coleman, Guocan Wang, Faqing Huang

Faculty Publications

Transcription from the commonly used GTP- initiating T7 class III promoter phi6.5 frequently produces heterogeneous RNA at both 3' and 5' ends. We demonstrate here that RNA transcripts from the T7 class II promoter phi2.5 have superior 5' homogeneity over those from the phi6.5 promoter, with comparable total RNA yields. The overall homogeneity of RNA transcripts is improved to different degrees depending on RNA sequences, although transcription under phi2.5 does not affect the 3' heterogeneity of RNA. In combination with 3' RNA trimming by DNAzymes or ribozymes, this ATP- initiated transcription system based on the T7 phi2.5 promoter can provide …

Self-Organizing Legal Systems: Precedent And Variation In Bankruptcy, Bernard Trujillo

Utah Law Review

Working with bankruptcy data and institutions, I have portrayed selforganizing structures as overlapping networks of legal and extra-legal actors, and I have explained self-organizing dynamics as processes of form innovation and norm emergence. I have adduced empirical evidence (including a substantial case study and statistical analysis of a quantitative database) to support the proposition that U.S. bankruptcy law is a self-organizing system. Finally, I have suggested that the self-organizing model might provide a more general theory of trial court behavior, and I have offered some preliminary thoughts on how the selforganizing model may illuminate basic research on discretion, doctrine, and …

From Ltoj : The Effects Of An Assessment Approach On Student Achievement In Mathematics At The Middle School Level, Toni Andersen

Graduate Research Papers

This study investigated the effectiveness of the assessment approach From LtoJ as applied to the development of procedural skills and conceptual understandings in mathematics at the eighth grade level. The focal question of this study was: Does the literature support the assessment process used in the From LtoJ program? The information was gathered from approximately one hundred students taking pre-algebra in a three-year span. The curriculum database focused on the essential information a student must acquire in the areas of curriculum vocabulary and concepts, as well as their computational ability with fractions. Each week, random items were selected from the …

An Information System For Streamlining Software Development Process, Serkan Nalbant

Turkish Journal of Electrical Engineering and Computer Sciences

In this paper an information system to be employed by software development organizations is proposed, which automates software development process. The proposed system aims to lower cost, improve schedule performance and enhance quality of the software projects by the means of automation and unifying of operational information. The characteristics of the proposed system are described. Furthermore, its use is illustrated via the explanation of an exemplary software system called PACE that serves as an information system for planning, controlling, measuring and improving software development process and projects. The relationship of PACE with Software Capability Maturity Model (CMM) is also provided.

Geochemistry And Geochronology Of Orthogneisses In The Derbent (Alaşehir) Area, Eastern Part Of The Ödemiş-Kiraz Submassif, Menderes Massif: Pan-African Magmatic Activity, Ersi̇n Koralay, O. Özcan Dora, Fukun Chen, Muharrem Satir, Osman Candan

Turkish Journal of Earth Sciences

Pan-African basement rocks and the Palaeozoic cover series of the Menderes Massif are exposed around Derbent (Alaşehir) in the eastern part of the Ödemiş-Kiraz submassif. Garnet-mica schists of the Pan-African basement are intruded by the protoliths of orthogneisses and Triassic leucocratic orthogneisses. This study focuses on the geochronology and geochemistry of orthogneisses related to the Pan-African evolution of the Menderes Massif in latest Proterozoic time. Geochemical data suggest that the orthogneisses were derived from S-type, peraluminous, syn- to post-collisional granitoids of calc-alkaline affinity. Zircon grains from the orthogneisses, which are euhedral with typical igneous morphologies, were dated by the Pb-Pb …

Variation Of Chemical Potential Oscillations Of A 2deg In A Quantum Well Under A Magnetic Field For Multiple Sub-Band Occupation As Function Of Temperature And Level-Broadening, Berri̇n Özdemi̇r, Zeki̇ Yarar, Meti̇n Özdemi̇r

Turkish Journal of Physics

We study the variation of chemical potential in a two dimensional electron gas in a uniform magnetic field as a function of temperature and level-broadening parameter. Schrödinger and Poisson equations are solved self-consistently for a two dimensional electron gas formed in a Ga_xAl_{1-x}As/GaAs quantum well, to numerically determine the potential profile, empty or occupied energy sub-bands, the wavefunctions and electron concentrations corresponding to each sub-band at various temperatures. Then assuming that the electron concentration is not altered, the variation of chemical potential with respect to both temperature and energy level-broadening parameter is studied under a uniform and constant magnetic field. …

Effect Of Iron Concentrations On Some Physical Properties Of The System Li_{0.5}Fe_{X}Ga_{2.5 - X}O_{4}, Abd El-Raouf Tawfik, N. Tashtoush, O.M. Hemeda

Turkish Journal of Physics

A series of Li_{0.5} Fe_{x} Ga_{2.5 - x} O_{4} systems were prepared for x = 0, 0.25, 0.5, 0.75 and 1 by the general ceramic method. X-ray diffraction showed that all compositions have single phase Spinel cubic structure. The lattice parameter increased with enhancing iron concentration. The thermoelectric coefficient decreased with increasing x, and the majority carriers are holes. The increase of the jump length of hole increased the electrical conductivity. Jump-length increased with iron concentration and the rate of jumping gave rise to the electrical conductivity. The concentration of Fe^{3 +} ions in Lithium gallate is important, for such …

Amps-1d Modeling Of A-Si:H N^{+}-I-N^{+} Structure: The Validity Of Space Charge Limited Current Analysis, Aynur Eray, G. Nobile

Turkish Journal of Physics

In this paper, the AMPS-1D (Analysis of Microelectronic and photonic structure) simulation program is used to understand the origin of the differences observed in Space Charge Limited Current (SCLC) analysis in thin and thick a-Si:H n^{ +} -i- n^{+} structure. For that purpose, the problem of applicability of SCLC measurements to n^{+}-i-n^{+} a-Si:H samples are investigated by using both the thin (0.3 \mu m) and thick (3 \mu m) samples. The simulation results show that activation energy in thick samples is larger than in thinner samples, which are an agreement with the experimental results. It is emphasized that this method …

Dielectric Properties And Conductivity Of Khco_3, Fathy Salman, S. Aboelhssan, Eslam Sheha, Mabrouk Elmansy

Turkish Journal of Physics

KHCO_{3} compound was characterized in three principle realms: for its dielectric properties as a function of temperature and frequency in the ranges 300--370 K and 50 Hz to 1 MHz, respectively; bulk conductivity as a function of temperature, via impedance technique; and relaxation time as function of temperature. Variations of the bulk conductivity and relaxation time with temperature have been found to yield two segments, with two different activation energies. The activation energy for the two segments due to bulk conductivity have been found as 1.96 eV and 1.85 eV, while the activation energy due to relaxation have been found …

Charged Particle--Image Interaction Near A Conducting Surface, Ersen Mete, Meti̇n Durgut

Turkish Journal of Physics

The interaction of a bulk electron with conducting surfaces is studied by means of the Bohm-Pines transformation in the second quantization formalism. The effective interaction potentials are obtained for the case of one plane and two plane configurations in the form of electron-image electron scattering.

Solution Of The Schrödinger Equation With One And Two Timensional Double-Well Potentials, Ramazan Koç, Derya Haydargi̇l

Turkish Journal of Physics

The Schrödinger equation with one and two dimensional potentials are solved in the framework of the sl_2(R) Lie algebra. Eigenfunctions of the Schrödinger equation for various asymmetric double-well potentials have been determined and the eigenstates are expressed in terms of the orthogonal polynomials. The solution of the double-well potential in two dimension have been analyzed.

An Evaluation Of Reference Evapotranspiration Models In Louisiana, Royce Landon Fontenot

LSU Master's Theses

Daily and monthly output from seven evapotranspiration models (FAO-24 Radiation, FAO-24 Blaney-Criddle, Hargreaves-Samani, Priestly-Taylor, Makkink, and Turc) have been tested against reference evapotranspiration data computed by the FAO-56 Penman-Monteith model to assess the accuracy of each model in estimating grass-reference evapotranspiration in Louisiana. Models were compared at eight stations of the Louisiana Agriclimate Information System using data from December 2002 to November 2003. Comparisons were also made using three composite regions: statewide, inland, and coastal. A pan evaporation to reference evapotranspiration model (FAO-24 Pan Evaporation) was also tested against daily grass reference evapotranspiration from the FAO-56 Penman-Monteith model using data …

Sound Waves: An Interdisciplinary Approach, Brian Howes

Graduate Research Papers

Physics is a subject that can be taught is such a way that it can range from a conceptual focus with very little mathematics integration or with a mathematical focus that includes the integration of calculus. At Hempstead High School in Dubuque, Iowa, physics is taught somewhere in the middle with a mathematical focus that includes the integration of algebra. However, many students take physics and pre-calculus in the same year and some were realizing that a couple of main concepts in physics and precalculus were very similar, such as vectors and waves. The problem was that these two classes …

Standards Based Recommendations For K-8 Science Curriculum At Independence Community School District, Jan Reed

Graduate Research Papers

The purpose of this study was to determine the gaps, redundancies, and conceptual inconsistencies present in the Independence Community School District K-8 science curriculum. The study was divided into four chapters with the first chapter providing an introduction, followed with a chapter laying out the background and framework. Chapter three consists of the method to create the product and the product itself which include the National Science Education Standards in one section and spreadsheet matrices in the traditional science content areas of life, earth/space, and physical science, science as inquiry, and science and technology for grades K-4 and grades 5-8 …

Multiple Intelligences Of Young Adolescents, Kelly A. Schloss

Graduate Research Papers

This study investigated how multiple intelligences related specifically to young adolescents. Self-perceptions of seventh and eighth graders, attending a large middle school and a moderately sized junior high in Iowa, were compared. Intelligence categories rated by students included intrapersonal, interpersonal, body/kinesthetic, mathematical/logical, verbal/linguistic, visual/spatial, and music/rhythmic.

Implications for this research include utilizing activity based instruction, promoting risk free learning opportunities for girls, implementing developmentally responsive practices at the middle level, providing educational support for low socio-economic students who may lack other resources often needed for success, and using visual, kinesthetic and musical approaches to learning for learning disabled students.

A Preferred Vision For Leading Elementary Schools : A Reflective Essay, Ellen M. Williams

Graduate Research Papers

This reflection paper affords the rare opportunity to sit back and think about this course of study and how I ended up at this particular juncture in life. I have completed many classes, and all I have taken away is a grade. This assignment has given rise to the discovery that there is a foundation and value system at the root of my professional life. That value system is mine, and I am building on an existing foundation that realizes the necessity of education and sound leadership.

Professional Development : The Missing Component In Education, Brett C. Ernst

Graduate Research Papers

Professional development addresses student needs and is based on researched teaching strategies that are proven to assist both the teacher and the student in meeting high achievement standards. Other indicators of effective professional development, as described by NCLB, include: ongoing support; data-driven decision making; and effective evaluation of the professional development. It has the potential to improve educators' attitudes, behaviors, knowledge and skills, so it benefits student learning. High quality professional development, when explicit about the results it is seeking to achieve, can assist both teachers and students to meet or exceed the desired outcomes they are being asked to …

Measuring The Success Of Classworks Computer Instruction, Susan J. Boatwright

Graduate Research Papers

The purpose of this research was to test the effectiveness of the computer program, ClassWorks Gold (CW) in improving student reading and writing scores. ClassWorks Gold is a computer program that merges parts of 150 commercially available language arts program with a built-in assessment and internal e-mail system.

Garfield Elementary School in Cedar Rapids, Iowa, received a grant from the Iowa Department of Education for the purchase and implementation of CW as a supplement to regular language arts classroom instruction. The grant required action research for an assessment. This paper focuses on the effectiveness of CW with two third grade …

Evaluation Of A Desktop Computed Radiography System For Imrt Dosimetry, Ines-Ana Jurkovic

LSU Master's Theses

Different techniques have been developed and used to evaluate dose distribution calculation accuracy and dose delivery reproducibility as a part of patient-specific IMRT QA – e.q. film dosimetry, ionization chambers, and diode arrays. To verify that the calculated dose distribution is delivered accurately during treatment, film dosimetry is usually used. The accuracy and reproducibility of film optical density as an indicator of dose is influenced by several variables, including the chemical processing and scanning conditions. This study investigates the possibility to use a desktop computed radiography (CR) system for patient-specific intensity modulated radiation therapy (IMRT) quality assurance (QA). A study …

Cover And Contents

Turkish Journal of Biology

No abstract provided.