Digital Commons Network^™

Comparative Analysis Of Three Remediation Technologies For The Clean Up Of Petroleum Contaminated Groundwater, Thomas Bouck

UNLV Theses, Dissertations, Professional Papers, and Capstones

This paper will compare three remediation technologies to determine which is the most efficient and effective remediation treatment for a petroleum contaminated groundwater site. The three remediation technologies are in situ bioremediation, in situ air sparging, and air stripping with carbon filtration. This comparison will be done through a literature review. It will take the information derived from the review and then apply it to the information about a petroleum contaminated groundwater location. The comparative analysis will consist of these parameters permit requirements, clean up time, operating and maintenance, and geological factors.

These factors permit requirements, cleanup time, and operating …

Unlv Magazine, Barbara Cloud, Laurie Fruth

UNLV Magazine

No abstract provided.

Electric-Octupole And Pure-Electric-Quadrupole Effects In Soft X-Ray Photoemission, Andrei Derevianko, Oliver Hemmers, S. Oblad, P. Glans, H. Wang, S. B. Whitfield, R. Wehlitz, I. A. Sellin, W. R. Johnson, Dennis W. Lindle

Environmental Studies Faculty Publications

Second-order [O(k²), k = ω/c] nondipole effects in soft-x-ray photoemission are demonstrated via an experimental and a theoretical study of angular distributions of neon valence photoelectrons in the 100–1200 eV photon-energy range. A newly derived theoretical expression for nondipolar angular distributions characterizes the second-order effects using four new parameters with primary contributions from pure-quadrupole and octupole-dipole interference terms. Independent-particle calculations of these parameters account for a significant portion of the existing discrepancy between experiment and theory for Ne 2p first-order nondipole parameters.

Lifetime Effects On The Dissociation Of Core-Excited N2 And Co Molecules, N. Saito, A. Hempelmann, F. Heiserq, Oliver Hemmers, K. Wieliczek, J. Viefhaus, U. Becker

Environmental Studies Faculty Publications

Vibrational-resolved ion and ion-pair yield spectra of N₂ and CO taken at their 1s⃗π^* resonance excitations reveal decay-channel-dependent core hole lifetimes. The linewidths of the yield spectra tend to be shortened when the number of electrons ejected in the deexcitation process increases, finally becoming narrower than the total ion yield or absorption natural lifetime width of the core-excited states of N₂ and CO, respectively. In contrast to this, the linewidths of the yield spectra for the singly charged molecular ions, N₂⁺ and CO⁺, are shown to be broader than their corresponding natural linewidths. …

Levels Of Synthetic Musks In Municipal Wastewater For Estimating Biota Exposure In Receiving Waters, Lantis Osemwengie

UNLV Theses, Dissertations, Professional Papers, and Capstones

Natural musk (muscone) is a highly prized natural product for use in expensive consumer fragrances. Inexpensive synthetic substitutes have been commercialized over the last 40 years. Two main chemical classes are used commercially — the nitro musks (which fulfilled the original demand for inexpensive fragrance additives for personal care products such as bath soap, body lotions, perfumes, and washing detergents) and the newer polycyclic musks which have musklike smell. The commercial nitro musks include musk ketone, musk moskene, musk ambrette, musk xylene, and musk tibetene. The polycyclics include trade named compounds such as Galaxolide®, Tonalide®, Celestolide®, Traseolide®, Phantolide®, and Cashmeran®, …

Estimation Of Evaporation Of Previously Condensed Hydrocarbons In A Tunnel Burn Experiment, Zoran Stefanoski

UNLV Retrospective Theses & Dissertations

As part of the worldwide demilitarization efforts, outmoded solid rocket motor propellant is being destroyed by burning. Often this is done on a repeated basis in a closed chamber. There is concern whether or not previously condensed materials on the chamber wall might be re-evaporated during a new burn; The objective of this thesis is to estimate the amount of evaporation/sublimation possible for different types of organic materials during burns in a tunnel. This was carried out theoretically and compared to measurements. For the estimations, predictions of the wall and ambient temperatures were made. The evaporation/sublimation was then estimated as …

Detecting Anomalies In Remotely Sensed Hyperspectral Signatures Via Wavelet Transforms, Clifton Dennis Morgan

UNLV Retrospective Theses & Dissertations

An automated subpixel target detection system has been designed and tested for use with remotely sensed hyperspectral images. A database of hyperspectral signatures was created to test the system using a variety of Gaussian shaped targets. The signal-to-noise ratio of the targets varied from -95dB to -50dB. The system utilizes a wavelet-based method (discrete wavelet transform) to extract an energy feature vector from each input pixel signature. The dimensionality of the feature vector is reduced to a one-dimensional feature scalar through the process of linear discriminant analysis. Signature classification is determined by nearest mean criterion that is used to assign …

Trackless On-Line Paging And Computer Memory Management, Edward Benjamin Mikhalkov

UNLV Retrospective Theses & Dissertations

We consider existing research methodology for dealing with competitiveness analysis of on-line algorithms as well as introduce some newer analysis techniques for testing research hypotheses. Paging is discussed in general and current algorithms are surveyed and analyzed; We also present a new randomized on-line algorithm for the 2-page cache problem that matches the lower bound, and, therefore, is optimal. The algorithm uses fewer resources than currently known algorithms for the same problem, and is, therefore, an improvement on existing results. Experimental findings for this new algorithm are also presented and analyzed.

Mapping The Boulder City Wetlands Using A Global Positioning System (Gps) And A Geographic Information System (Gis), Jennifer Lea Bishop

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Boulder City Wetlands is a constructed wetlands park located in Boulder City, Nevada, approximately 23 miles southeast of Las Vegas, Nevada. Currently, a baseline study of water quality is being conducted in the Boulder City Wetlands. This baseline study of the wetlands is an important step in understanding the development of the Boulder City Wetlands over time. As wastewater is eventually introduced into the existing community tap water running through the wetlands, it is expected that the nitrogen within the water will enhance the growth of vegetation in the surrounding area. Comparing the vegetation growth over time is only …

Partitioning Of Large Hdl Asic Designs Into Multiple Fpga Devices For Prototyping And Verification, Nilesh V Dhavlikar

UNLV Retrospective Theses & Dissertations

The ASIC (Application specific Integrated Circuit) designs grow continuously bigger and bigger. This causes dramatic increase in the simulation run time. It is very hard to simulate these designs because the simulation time has risen from hours to days and weeks. Hardware Embedded Simulation (HES) is a technology that facilitates incremental design verification of ASICs. The FPGAs (Field Programmable Gate Arrays) can play an important role in ASIC design cycle. But it is not possible to fit an entire ASIC design into a single FPGA device. This problem can be solved by partitioning the given design into multiple small size …

Unlv College Of Education Multicultural & Diversity Newsletter, Steve Mccafferty, John Filler, Nancy P. Gallavan, Le Ann Putney, Nancy Sileo, Kyle Higgins, Porter Troutman, Paul Meacham, Cyndi Giorgis, Aimee Govett, Jean Henry, Bill Pankratius, Lisa Bendixen, Joyce Nelson-Leaf

College of Education Multicultural & Diversity Newsletter

A newsletter discussing a variety of topics dealing with multicultural topics and diversity in education.

Beyond The Dipole Approximation: Angular-Distribution Effects In The 1s Photoemission From Small Molecules, Dennis W. Lindle, Oliver Hemmers, H. Wang, P. Focke, I. A. Sellin, J. D. Mills, J. A. Sheehy, P. W. Langhoff

Environmental Studies Faculty Publications

Over the past two decades, the dipole approximation has facilitated a basic understanding of the photoionization process in atoms and molecules. Recent experiments on the 1s inner shells of small molecules at relatively low photon energies (⩽ 1000 eV) show strong nondipole effects. They are significant and measurable at energies close to threshold, in conflict with a common assumption that the dipole approximation is valid for photon energies below 1 keV.

Design Of A Fuzzy Logic Controller For Swing-Damped Transport Of An Overhead Crane Payload, Michael James Nalley

UNLV Retrospective Theses & Dissertations

Transportation using overhead cranes can excite undesirable payload swinging. These oscillations have to be damped before other payload manipulation is done. A swing-damped motion profile based on the natural frequency of the payload is used to minimize swing excitation. In addition, a fuzzy logic controller is used to move the overhead crane along a desired path while ensuring that the payload is swing-free at the end of the motion. The control action is divided between displacement and swing controllers to simplify controller tuning for optimal performance. Examples, along with comparisons with a PD controller, are included, as well as related …

Permutation Polynomials And Systems Of Permutation Polynomials In Several Variables Over Finite Rings, Angela Marie Starr

UNLV Retrospective Theses & Dissertations

This paper will present the historical development of theorems regarding permutation polynomials in several variables over finite fields. Single variable permutation polynomials will be discussed since they are so important to the discussions which will follow. Theorems involving permutation polynomials and systems of permutation polynomials will also be considered. It will be shown that many of the interesting results obtained for finite fields can be generalized to finite rings.

Experimental Investigation Of Natural Convection About Drift-Emplaced Waste Canisters, Qun Wang

UNLV Retrospective Theses & Dissertations

Drift-emplaced waste canisters are under consideration for the long-term storage of high-level spent fuel in the proposed underground repository at Yucca Mountain. These canisters will be placed on pedestals above the floor of the drift and exchange heat with the wall of the drift with air circulating through the repository. To assess the requirements for repository energy management and the ventilation system, flow visualization and heat transfer experiments for natural convection were performed. The experiments used both the smoke generation and the dye injection techniques to obtain the natural convection patterns for 4.9 {dollar}\times{dollar} 10{dollar}\sp4{dollar} {dollar}\le{dollar} Ra{dollar}\sb{\rm d}{dollar} {dollar}\le{dollar} 1.6 …

An Augustinian Analysis Of The Comprehensive Test Ban Treaty, Jon Mcclendon White

UNLV Retrospective Theses & Dissertations

Applying the Christian principles of depraved human nature, expectation of detrimental behavior from irrational actors, and rational attempts to limit the destructiveness of war, Augustine would conclude that the declared nuclear weapons states have a moral obligation to prevent proliferation of nuclear weapons. Laws suitable to the needs of the times are the appropriate method for accomplishing this. The pending Comprehensive Test Ban Treaty (CTBT) is one such law. Because the CTBT bans all nuclear explosions and establishes an intrusive inspection scheme, it will have an impact on the U. S. Department of Energy (DoE). DoE should respond by participating …

Beliefs Of Teachers And Principals Regarding Iste's 2000 Technology Standards For All Teachers, Essington R Wade

UNLV Retrospective Theses & Dissertations

The purpose of this study was to ascertain if there were significant differences in the way teachers and principals articulated their beliefs about technology standards for all teachers. In comparing secondary principals to secondary teachers using the statistical instruments, it was found that the variables: secondary levels (middle and high) and positions (principal, English, math, science and social studies teachers) were not significantly different. In addition, the statistical analysis indicated that there were no significant interactions between secondary levels and educational positions. Examination of the mean values and the frequency distributions of teachers and principals revealed that the means of …

Scaffolding Literacy Knowledge Within A One -On -One Tutoring Situation: An Ethnographic Study, Diane Katherine Brantley

UNLV Retrospective Theses & Dissertations

The primary purpose of this study was to explore and describe the culture of tutoring to determine if America Reads Challenge (ARC) tutors were able to provide elementary school tutees with scaffolded literacy learning experiences. Three main educational theories formed the framework for this study: sociocultural theory of cognitive development, scaffolding, and activity theory. Relevant research related to the efficacy of tutoring programs also was included. The overarching research design was an ethnographic methodology that included the collection of video tape, followed up with informal interviews to substantiate the findings with the two tutoring dyads; Subsequently, the data was analyzed, …

Dance In The Contemporary American Musical Theater: What Has Become Of The Dream Ballet?, Phoebe Ellen Newsted

UNLV Retrospective Theses & Dissertations

The dream ballet is defined. The discussion explains the inception, subsequent rise and eventual disappearance of the dream ballet. The research follows the development of the dream ballet and identifies its contributions to the American musical theater. The thesis specifically examines the amplification of the emotional realm of character and plot development, as elicited by the dream ballet; The study evaluates the void left today by the absence of the dream ballet in relation to an examination of the climate of contemporary American musical theater. The analysis explores the correlation between the decline of the dream ballet and the decline …

Pultrusion Of Commingled Thermoplastic Composite Materials, Vijay Anand Ananthakrishnan

UNLV Retrospective Theses & Dissertations

The work involves the analysis and verification of the pultrusion process. The pultrusion machine at UNLV was improved by modifying the consolidation and the cooling system. A comparative study of the material properties of the pultrusion process and the compression molding were done with the theoretical material properties. This involved a series of compression molding experiments of the commingled material followed by the pultrusion process itself. The results were then confirmed by a series of mechanical tests of the material obtained as a result of the pultrusion and the compression molding processes in the Material Test System (MTS) machine. The …

Imaging The Mantle In Southwestern, Utah Using Geochemistry, And Geographic Information Systems, Reina Fern Downing

UNLV Retrospective Theses & Dissertations

Basaltic volcanism is common in the transition zone from the Basin and Range to the Colorado Plateau. This study focuses on an 80 km long transect containing seven separate basalt fields spaced less than 20 km apart. The transect extends from eastern Nevada through northwestern Arizona and into southwestern Utah, across the crustal boundary defined as the transition zone; Geochemistry and geographic information systems (GIS) define the geometry and orientation of a mantle boundary trending approximately E-W, almost perpendicular to the crustal boundary. This study suggests that there is no genetic link between the mantle boundary and crustal boundary between …

Automated Mammographic Mass Shape Classification Using Wavelets And Neural Networks, Nithya Shanmugam

UNLV Retrospective Theses & Dissertations

The objective of the thesis is to demonstrate the utility of wavelet transforms with artificial neural networks for the classification of mammographic mass shapes. A fully automated mammographic classification system has been developed to distinctly classify mass shapes as either round, which typically indicates the absence of breast cancer, or irregular, which typically indicates the presence of cancer. First, a wavelet transform was applied to the radial distance measure (RDM) of the mass shapes to obtain multiscale decomposition. The discrete wavelet transform and wavelet packet decompositions were investigated. The second step was the computation of scalar-energy features from the wavelet …

An Application Of Optimal Control Theory In Welfare Economics, Steven Ernest Scroggin

UNLV Retrospective Theses & Dissertations

We consider the maximization of a functional representing social welfare over continuous time. A social welfare functional (SWF) is an integral that models social welfare as a function of individual consumption, individual utility of consumption and the value of utility aggregated across individuals. A SWF may be subject to constraints in the form of differential or integral equations and inequalities, which represent the production possibilities of the economy. We solve the optimization problem by applying the Pontryagin maximum principle. We consider an autarky and a command economy. We explore the interaction of impatience and productivity in autarky and the implications …

Pre-Service Secondary Mathematics Teachers' Attitudes About The History Of Mathematics, Kelly Marie Sullivan

UNLV Retrospective Theses & Dissertations

This study was conducted to show that using historical material to teach mathematical content to pre-service secondary mathematics teachers could improve their attitudes about incorporating the history of mathematics into the mathematics classroom. A historical module from the Mathematical Association of America was taught to an undergraduate class of pre-service secondary mathematics teachers. Their attitudes regarding the use of the history of mathematics in the mathematics classroom were then compared to the attitudes of students in another undergraduate class, taught by the same researcher, whose instruction did not incorporate history. Results from t-tests indicate that there was a positive change …

Acoustic Characteristics Of Fiberglass-Lined Circular Ducts, Luis A Villegas

UNLV Retrospective Theses & Dissertations

Fiberglass lined circular ducts are circular ducts with an outer spiral metal shell. They are either dual-wall or single-wall. They have been acoustically treated and are intended to be used in heating, ventilation and air conditioning (HVAC) duct systems to reduce the amount of sound that is generated by the operation of the components of the system; To quantify the amount of the sound energy that can be attenuated by a given fiberglass lined circular duct, its acoustical performance has to be determined. Acoustical performance of lined ducts can be experimentally determined in an acoustical laboratory under controlled conditions. These …

On Speech Processing, Ying Yang

UNLV Retrospective Theses & Dissertations

Speaking is one of the most important ways of communication between humans. Speech processing refers to the technology of speech signal transformations for more efficient storage and transmission, for enhanced intelligibility and ease of assimilation. According to the different purpose as above, technologies on speech signal processing falls into three main categories. They are speech coding, speech recognition and speech synthesis; This thesis shows the experience of our approaching in this area. It focused on analyzing the different characteristics of speech by using mathematical and statistical methods. A test based on lagl product of signals was taken for separating the …

An Analysis Of Interconnection Network Effects Of Dynamic Element Matching Digital-To-Analog Converters, Hui Fu

UNLV Retrospective Theses & Dissertations

Digital-to-Analog Converters (DACs) convert digital signals into analog signals and thereby provide the link from digital systems to the analog world. Many DAC architectures use matched components to convert signals. However, practical DACs contain mismatched circuit components that cause nonlinear errors in the DAC's analog output signal. Dynamic Element Matching (DEM) is a method that can eliminate or reduce the effects of mismatch errors. In this thesis, DEM algorithms applied to a specific DEM DAC architecture that use several interconnection networks, including the Barrel Shifting network, the Generalized-Cube network, the Omega network and the Indirect Binary n-cube network, are mathematically …

The Gamma Distribution As An Alternative To The Lognormal Distribution In Environmental Applications, Ross Joseph Iaci

UNLV Retrospective Theses & Dissertations

In environmental applications dealing with data from contaminated sites the positively skewed lognormal distribution has been the most commonly used model. The upper confidence limit (UCL) of the arithmetic mean of a lognormal population is computed by using the H-statistics. Recent concerns have arisen to the effectiveness of the H-Statistic based UCL for the mean of the lognormal distribution in instances of moderately to highly skewed data sets. In this paper the positively skewed Gamma distribution is considered as an alternative to the lognormal distribution and is shown to produce more reasonable UCL's for the mean.

Average Cayley Genus For Cayley Maps With Dihedral Groups, Jamie Keith Langille

UNLV Retrospective Theses & Dissertations

Let Gamma be a finite group and let Delta be a generating set for Gamma. A Cayley map associated with Gamma and Delta is an oriented 2-cell embedding of the Cayley graph GDelta (Gamma) such that the rotation of arcs emanating from each vertex is determined by a unique cyclic permutation of generators and their inverses. A formula for the average Cayley genus is known for the dihedral group with generating set consisting of all the reflections. However, the known formula involves sums of certain coefficients of a generating function and its format does not specifically indicate the Cayley genus …

Basic Skills Teacher Licensure Test Scores As College Of Education Admission Criteria, Audrey Lawrence

UNLV Retrospective Theses & Dissertations

The objective of this paper is to analyze the criterion-related validity of the Pre-Professional Skills Test (PPST) cut-scores as teacher education program admission criteria. PPST and American College Test (ACT) scores of 372 graduates, and PPST scores and other academic characteristics of 1,062 graduates of a Nevada teacher education program were examined. Findings of this study support that PPST and ACT subtests measure similar constructs, PPST scores do not predict success in student teaching, nor do they predict teacher candidates' college GPAs over and above ACT scores. In addition, over 99 percent of students who received scores of 22 or …