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The Study Of Yucca Mountain For A Possible Nuclear Storage Facility Science Vs. Politics, Anna Leske Apr 1995

The Study Of Yucca Mountain For A Possible Nuclear Storage Facility Science Vs. Politics, Anna Leske

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this paper is to determine whether scientific or political methods were used by the of the United States Congress in the study of the nuclear waste storage facility in Yucca Mountain, Nevada. The history nuclear power and the history of the Johnston compromise that lead to the elimination of Texas and Washington States as possible sites for the repository is explained. A review of the conflicts between Nevada politicians and the U.S. Congress over the designation of Yucca Mountain as the sole study for a permanent storage site of the nation's high-level nuclear waste is addressed along …

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Limiting Growth In Las Vegas - A Necessary Growth Strategy For The Twenty-First Century, Cheryl Ann Frassa Apr 1995

Limiting Growth In Las Vegas - A Necessary Growth Strategy For The Twenty-First Century, Cheryl Ann Frassa

UNLV Theses, Dissertations, Professional Papers, and Capstones

Land development in the Las Vegas Valley continues at an unprecedented rate and future growth will no doubt be strongly advocated. Yet, water resources in this desert area are finite, and in the near future, supply will fall short of demand. Plans are underway to supplement the existing supply, and proposals to secure additional sources are under investigation. But there are no guarantees these ambitious endeavors will materialize. In light of the pending water crisis, the pervasive "growth at all cost" policies now dominant in the valley must be abandoned and more realistic land-use policies developed; ones based on the …

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Updating The Colorado River Compact, Jeffrey A. Freer Apr 1995

Updating The Colorado River Compact, Jeffrey A. Freer

UNLV Theses, Dissertations, Professional Papers, and Capstones

Water is essential to life in the arid environment of the western United States. For centuries, humans have used the Colorado River to fulfill their needs and until the past 100 years, the use of the river was sustainable. Over the last 100 years, the Colorado River has been dammed and diverted to "reclaim" the arid west for man's use. In 1946, a Department of the Interior report stated that "Tomorrow the Colorado will be utilized to the very last drop. Its water will convert thousands of additional acres of sagebrush desert to flourishing farms and beautiful homes for servicemen, …

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Using Gis To Identify Critical Areas For Water Quality Protection In New York City's Water Supply System, Paul K. Barten, Krystyna Anne Stave Apr 1995

Using Gis To Identify Critical Areas For Water Quality Protection In New York City's Water Supply System, Paul K. Barten, Krystyna Anne Stave

Public Policy and Leadership Faculty Research

The protection of water quality at its source — the watershed — recognizes that minimizing land use impacts and allowing natural processes to provide in situ biological treatment can complement conventional engineering methods. In contrast to the enormous costs projected for drinking water filtration, the judicious application of watershed management principles and practices is a way to balance the needs of people with the capacity of the natural resource base over time. This paper describes the development and initial application of a geographic information system (GIS) to a ortion of New York City's 2,000 square mile water supply system, the …

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Unlv Magazine, Barbara Cloud Apr 1995

Unlv Magazine, Barbara Cloud

UNLV Magazine

No abstract provided.

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Design And Performance Of The Advanced-Light-Source Double-Crystal Monochromator, G. Jones, S. Ryce, Dennis W. Lindle, B. A. Karlin, J. C. Woicik, Rupert C. Perera Feb 1995

Design And Performance Of The Advanced-Light-Source Double-Crystal Monochromator, G. Jones, S. Ryce, Dennis W. Lindle, B. A. Karlin, J. C. Woicik, Rupert C. Perera

Chemistry and Biochemistry Faculty Research

A new “Cowan type” double-crystal monochromator, based on the boomerang design used at National Synchrotron Light Source (NSLS) beamline X-24A, has been developed for beamline 9.3.1 at the Advanced Light Source (ALS), a windowless ultrahigh vacuum beamline covering the 1-6 keV photon-energy range. Beamline 9.3.1 is designed to simultaneously achieve the goals of high energy resolution, high flux, and high brightness at the sample. The mechanical design of the monochromator has been simplified, and recent developments in technology have been included. Measured mechanical precision of the monochromator shows significant improvement over existing designs. In tests with x-rays at NSLS beamline …

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Observation Of Parity-Unfavored Transitions In The Nonresonant Photoionization Of Argon, B. Langer, J. Viefhaus, Oliver Hemmers, A. Menzel, R. Wehlitz, U. Becker Feb 1995

Observation Of Parity-Unfavored Transitions In The Nonresonant Photoionization Of Argon, B. Langer, J. Viefhaus, Oliver Hemmers, A. Menzel, R. Wehlitz, U. Becker

Environmental Studies Faculty Publications

Single-photon ionization of an atom or molecule can be subdivided into parity-favored and -unfavored transitions, the latter characterized by electron emission, preferentially perpendicular to the electric vector. The nonresonant existence of these transitions is shown experimentally and studied over an extended energy range for a variety of satellite transitions in atomic argon. The spectra exhibit several clearly resolved satellite lines with strongly negative β values close to -1, independent of the photon energy. The results confirm the corresponding predictions of angular-momentum transfer theory.

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High-Brightness Beamline For X-Ray Spectroscopy At The Advanced Light Source, Rupert C. Perera, G. Jones, Dennis W. Lindle Feb 1995

High-Brightness Beamline For X-Ray Spectroscopy At The Advanced Light Source, Rupert C. Perera, G. Jones, Dennis W. Lindle

Chemistry and Biochemistry Faculty Research

Beamline 9.3.1 at the Advanced Light Source (ALS) is a windowless beamline, covering the 1-6 keV photon-energy range, designed to achieve the goals of high energy resolution, high flux, and high brightness at the sample. When completed later this year, it will be the first ALS monochromatic hard-x-ray beamline, and its brightness will be an order-of-magnitude higher than presently available in this energy range. In addition, it will provide flux and resolution comparable to any other beamline now in operation. To achieve these goals, two technical improvements, relative to existing x-ray beamlines, were incorporated. First, a somewhat novel optical design …

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Structure Of Woody Riparian Vegetation In Great Basin National Park, S. D. Smith, K. J. Murray, F. H. Landau, A. M. Sala Jan 1995

Structure Of Woody Riparian Vegetation In Great Basin National Park, S. D. Smith, K. J. Murray, F. H. Landau, A. M. Sala

Life Sciences Faculty Research

The community composition and population structure of the woody riparian vegetation in Great Basin National Park are described. Community analyses were accomplished by sampling 229 plots along an elevational gradient of 8 major stream systems in the Park. TWINSPAN analysis identified 4 primary species groups that were characterized by Populus tremuloides (aspen), Abies concolor (white fir), Rosa woodsii (Woods rose), and Populus angustifolia (narrowleaf cottonwood) as dominants, respectively. Detrended Correspondence Analysis (DECORANA) showed that the most important environmental factors associated with the distribution of species were elevation and slope, with flood-related physiographic factors having a secondary effect. Analysis of size-class …

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Anti-Swing Control Of Overhead Cranes, Murali Srinivas Kathari Jan 1995

Anti-Swing Control Of Overhead Cranes, Murali Srinivas Kathari

UNLV Retrospective Theses & Dissertations

Overhead cranes are widely used for transporting large and heavy suspended objects such as shipping containers. Acceleration and deceleration of the crane generally induce swinging motion in the suspended payload. A method is presented to find the trajectory for an overhead crane that will ensure the transfer of the payload in the shortest time and with minimum swinging along a specified path. The overhead crane and the suspended payload are modeled as a double pendulum with motion in three dimensional space. The equations of motion of the overhead crane and the payload are transformed in terms of a single path …

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Self-Stabilizing Tree Algorithms, Visalakshi Thiagarajan Jan 1995

Self-Stabilizing Tree Algorithms, Visalakshi Thiagarajan

UNLV Retrospective Theses & Dissertations

Designers of distributed algorithms have to contend with the problem of making the algorithms tolerant to several forms of coordination loss, primarily faulty initialization. The processes in a distributed system do not share a global memory and can only get a partial view of the global state. Transient failures in one part of the system may go unnoticed in other parts and thus cause the system to go into an illegal state. If the system were self-stabilizing, however, it is guaranteed that it will return to a legal state after a finite number of state transitions. This thesis presents and …

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Determination Of Soluble Mineral Content In Las Vegas Soils, Mark Alan Leonard Jan 1995

Determination Of Soluble Mineral Content In Las Vegas Soils, Mark Alan Leonard

UNLV Retrospective Theses & Dissertations

Lower basin areas in the Las Vegas Valley contain soils with large amounts of soluble minerals. Dissolving and leaching processes due to water intrusion into foundation soils containing soluble minerals can cause a volume reduction of the soil which in turn causes structural stress. Soil improvement recommendations for soluble soils are based upon the amount of soluble minerals of a parent soil. This study reports the results of research to develop a correlation between the electrical conductivity and the concentration of soluble minerals in aqueous soil extracts. Correlations were developed by measuring the total dissolved solids and conductance of aqueous …

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The Effect Of Prior Exercise On The Thermic Effect Of Carbohydrate Versus Fat Feeding In Man, Cindy Beth Palmer-Lynch Jan 1995

The Effect Of Prior Exercise On The Thermic Effect Of Carbohydrate Versus Fat Feeding In Man, Cindy Beth Palmer-Lynch

UNLV Retrospective Theses & Dissertations

Prior exercise potentiates the thermic effect of a carbohydrate meal. The purpose of this study was to determine if the potentiating effect of exercise is unique to carbohydrate meals or whether prior exercise also potentiates the thermic effect of a fat meal. Subjects were 15 healthy females (24 years, 60 KG, 20% body fat). Each subject completed an exercise and a control trial for each meal, each trial on a separate day. Meal size was 2510 KJ (600 kcal) and consisted of 100% carbohydrate, compared with 90% fat combined with 10% carbohydrate. Subjects exercised for 45 minutes at 70% of …

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A Comprehensive Strategy For Longitudinal Vehicle Control With Fuzzy Supervisory Expert System, Pushkin Kachroo, M. Tomizuka, A. M. Agogino Jan 1995

A Comprehensive Strategy For Longitudinal Vehicle Control With Fuzzy Supervisory Expert System, Pushkin Kachroo, M. Tomizuka, A. M. Agogino

Electrical & Computer Engineering Faculty Research

The main objectives of vehicle motion control on an automated highway system are stable and safe automatic longitudinal and/or lateral path following in a platoon of vehicles. Various controllers can be used to satisfy the same objectives, but they may require different variables to be sensed or different conditions to be met. Supervision can select a controller and switch to a different controller depending on the conditions. Specifically, a fuzzy supervisory expert system checks for various system conditions and chooses a controller from PID, PI, sliding mode and a fuzzy controller or gives a distress signal. The choice between PID …

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A Study Of Bistable Behavior And Parameter Variation In Dark Molecular Clouds, Robert Lee Vaughn Jan 1995

A Study Of Bistable Behavior And Parameter Variation In Dark Molecular Clouds, Robert Lee Vaughn

UNLV Retrospective Theses & Dissertations

A study of Bistable Behavior and Parameter Variation in Dark Molecular Clouds investigates the phenomenon of bistability and its relation to phase transitions, derives an analytical model of fractional ionization and does a parameter study. Specifically, this investigation focuses on several different types of phenomena that are associated with the modeling of giant and dark molecular clouds. The chemical model of a molecular cloud consists of a set of stiff coupled differential equations. Each differential equation represents the rate of change of the abundance of a chemical species in the molecular Cloud Analytical approximations to the fractional ionization are presented; …

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Analysis Of Saturation Flows At Single, Dual And Triple Left-Turn Lanes, Kenneth Walter Ackeret Jan 1995

Analysis Of Saturation Flows At Single, Dual And Triple Left-Turn Lanes, Kenneth Walter Ackeret

UNLV Retrospective Theses & Dissertations

The primary objective of the research presented in the dissertation, Analysis of Saturation Flows at Single, Dual and Triple Left-Turn Lanes, is to gain a better understanding of the operational characteristics of single and multiple left-turn lanes as compared to adjacent through-lanes on the same intersection approach. The findings of this study are based on average saturation flow headways as observed between the 4th and 8th vehicles within a saturation queue discharge. These observations were made for left turn movements at signalized intersections with protected left-turn phases. The findings of this study are based on field measurements taken at 62 …

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Computer Generation And Rendering Of Terrain, Frederick John Haab Jan 1995

Computer Generation And Rendering Of Terrain, Frederick John Haab

UNLV Retrospective Theses & Dissertations

Computer Generation and Rendering of Terrain explores different techniques that are currently used in computer science to generate terrain data. Also explored are some techniques for rendering the terrain on a computer display. A new three step technique for the generation of terrain that is based on geometric characteristics is presented, as is a hybrid rendering technique.

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Experimental Study Of Heat Transfer And Fluid Flow In Unsaturated Porous Media, Abdullah Abdullatif Izzeldin Jan 1995

Experimental Study Of Heat Transfer And Fluid Flow In Unsaturated Porous Media, Abdullah Abdullatif Izzeldin

UNLV Retrospective Theses & Dissertations

A laboratory experiment was conducted to investigate thermal and fluid flow behavior in an unsaturated porous medium. The experiment consisted of a bed of homogeneous glass beads packed uniformly in a Lexan rectangular box. A cylindrical heat source was located horizontally in the middle region of the bed and the bed was heated to steady state conditions. Water was then introduced uniformly through square nozzles located over the fill material for short periods of time. The box was fitted with a screen at the bottom to keep the porous material intact while allowing the water to flow out. Below the …

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Travel Demand Modeling For Developing Countries, Satyakala Jarugumilli Jan 1995

Travel Demand Modeling For Developing Countries, Satyakala Jarugumilli

UNLV Retrospective Theses & Dissertations

The transportation planning process or travel demand forecasting process which is most commonly used at present, called the Urban Transportation Planning Process (UTPP), has its origins in studies performed about three decades ago in urban areas in the United States. This conventional planning process was designed primarily for the western/developed world where affordability and accessibility to a personal automobile is a common feature; The UTPP based models used in forecasting future travel demand rely heavily on socio-economic variables that are associated with an individual's propensity to travel. The socio-economic environments in the developing and the under-developed world are different from …

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A Classification Of Groups Satisfying The Converse Of Lagrange's Theorem, Laura Earl Laurent Jan 1995

A Classification Of Groups Satisfying The Converse Of Lagrange's Theorem, Laura Earl Laurent

UNLV Retrospective Theses & Dissertations

This paper is a classification of finite groups satisfying the converse of Lagrange's Theorem. We begin by showing a series of inclusions of classes of finite groups: p-groups {dollar}\subseteq{dollar} nilpotent {dollar}\subseteq{dollar} supersolvable {dollar}\subseteq{dollar} polycyclic {dollar}\subseteq{dollar} solvable. The crucial point of the paper consists of the proof that the class of supersolvable groups is contained in the class of converse Lagrange groups while the class of polycyclic groups is not. We also show that finite cyclic groups and finite abelian groups are included in the class of converse Lagrange groups. Finally, we give an example to show that the class of …

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Comparative Study Of Advanced Heat Pumps, Craig M Moiola Jan 1995

Comparative Study Of Advanced Heat Pumps, Craig M Moiola

UNLV Retrospective Theses & Dissertations

A numerical simulation study is reported on the thermodynamic performance of several non-CFC refrigeration devices. The study includes complex compound absorption, Brayton, Stirling, and thermoelectric devices. Comparisons are made to the more commonly applied vapor compression systems, including those using R-134a. The study examines the effect of thermal resistances between the device and the heat rejection or heat absorption space. A cool side temperature difference between 0 and 20{dollar}\sp\circ{dollar}C is investigated, and this temperature difference accounts for both thermal resistance and cooling load. An outside temperature ranging between 35{dollar}\sp\circ{dollar}C and 46{dollar}\sp\circ{dollar}C is considered in the calculations, with a cooled space …

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High Frequency Surface Estimation, Sai Prasad V Pallati Jan 1995

High Frequency Surface Estimation, Sai Prasad V Pallati

UNLV Retrospective Theses & Dissertations

Mountain generation can be considered a part of the general theory of surface estimation; In this thesis, two methods have been presented to generate fractals--fast Fourier method and a new generalized stochastic subdivision method. Also, a new surface estimation method has been introduced that deals with points of unequal powers. The uniqueness of this method is the usage of splines to calculate the arc lengths between the points, as opposed to Euclidean distances used in Kriging. The fast Fourier technique has been used to generate mountains in particular; also, some extensions have been suggested, whereby different sets of mountains can …

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Periodic Complementary Binary Sequences, Maria Consuelo C Pickle Jan 1995

Periodic Complementary Binary Sequences, Maria Consuelo C Pickle

UNLV Retrospective Theses & Dissertations

Since man devised a way to count, patterns or sequences of numbers have held mathematicians' attention. However, it has only been recently that binary sequences have received so much attention due to their compatibility with computers. For the past 30 years the fields of Electrical Engineering, Computer Engineering and Mathematics have done some extensive research in this area because of its many applications in radar, sonar and the reliability and security of communication systems such as digital communications, faxes, telecommunications and electronic transfers especially in banking and finance. First discussed will be the Perfect Binary Sequence. Then the Golay Complementary …

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New Methods In Image Compression Using Multi-Level Transforms And Adaptive Statistical Encoding, Thomas William Pike Jan 1995

New Methods In Image Compression Using Multi-Level Transforms And Adaptive Statistical Encoding, Thomas William Pike

UNLV Retrospective Theses & Dissertations

The need to meet the demand for high quality digital images, with comparatively modest storage requirements, is driving the development of new image compression techniques. This demand has spurred new techniques based on time to frequency spatial transformation methods. At the core of these methods are a family of transformations built on basis sets called "wavelets." The wavelet transform permits an image to be represented in a substantially reduced space by transferring the energy of the image to a smaller set of coefficients. Although these techniques are lossy as the compression ratio rises, very adequate reconstructions can be made from …

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Influence Of Grain Size Of A Porous Medium On The Movement Of Diesel Fuel Due To Water Table Fluctuations, Vasanthakumar Rajagopalan Jan 1995

Influence Of Grain Size Of A Porous Medium On The Movement Of Diesel Fuel Due To Water Table Fluctuations, Vasanthakumar Rajagopalan

UNLV Retrospective Theses & Dissertations

Experiments were conducted in a sand tank to determine the influence of grain size of a porous medium and residual water saturation on the movement of diesel fuel. Three different grades of sand (#12, #20, and #30 grades with mean grain diameters of 0.178cm, 0.08cm, and 0.056cm respectively) were used in the experiments. A water table was simulated and the sand above the capillary fringe was initially at residual water saturation. Diesel fuel (5 liters) was leaked into the sand, above the capillary fringe. A uniform, symmetrical pattern of diesel fuel smearing was observed for all the three grain sizes …

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Determination Of Formaldehyde By Ion Exclusion And Ion Exchange Separation With Amperometric Detection, Yilin Shi Jan 1995

Determination Of Formaldehyde By Ion Exclusion And Ion Exchange Separation With Amperometric Detection, Yilin Shi

UNLV Retrospective Theses & Dissertations

A method has been developed for determination of formaldehyde in air sample extracts by ion exclusion and ion exchange separation followed by amperometric detection. Optimum eluant compositions and separation columns for the best separation have been determined, as well as the optimum working electrode, electrolytes, and applied potentials for the best detection. An internal standardization was used to correct for detector drift. An interference study was performed for organic acids, other aldehydes, and alcohols. Using impingers containing aqueous bisulfite solution for collection, a side by side comparison study with the 2,4-DNPH method (also using impingers) was conducted. The detection limit …

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A Modern Synthesis Of Faith And Reason, Ralph Wm Thomas Jan 1995

A Modern Synthesis Of Faith And Reason, Ralph Wm Thomas

UNLV Retrospective Theses & Dissertations

Today, modern man is uneasy. The current outcry for ethics in government and in social life reflects a need which has not been met. What distinguishes man as a rational and creative human being are his moral, abstract, artistic, creative, and spiritual ideas. In many instances, such ideas have been declared as meaningless by the 'reasoning' of the natural sciences; This thesis will develop a modern paradigm that will synthesize subjective values coming from the 'faith' side of rational beings with the objective values obtained from their objective (abstract reasoning) side of themselves; The paradigm will be illustrated by applying …

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Differences In The Degree Of Learning Of Students Taught Using Computer Aided-Mastery Learning Versus Expository Instruction, Essington Rupert Wade Jan 1995

Differences In The Degree Of Learning Of Students Taught Using Computer Aided-Mastery Learning Versus Expository Instruction, Essington Rupert Wade

UNLV Retrospective Theses & Dissertations

The purpose of this study was to ascertain the differences between two teaching methods (traditional instruction and computer aided-mastery learning), and the degree of learning of students enrolled in basic electronics at a technical high school, for the 1993-94 and 1994-95 school years. The electronics department had used an expository method to deliver electronics instruction for the past eight years. Computer aided-mastery learning was used for the first time during the 1994-95 school year. Twenty four teacher made tests were used to assess degree of learning. Two independent t-tests were used to compare the means of each group. The groups …

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Self-Stabilizing Sorting Algorithms, Joseph Chacko Jan 1995

Self-Stabilizing Sorting Algorithms, Joseph Chacko

UNLV Retrospective Theses & Dissertations

A distributed system consists of a set of machines which do not share a global memory. Depending on the connectivity of the network, each machine gets a partial view of the global state. Transient failures in one area of the network may go unnoticed in other areas and may cause the system to go to an illegal global state. However, if the system were self-stabilizing, it would be guaranteed that regardless of the current state, the system would recover to a legal configuration in a finite number of moves; The traditional way of creating reliable systems is to make redundant …

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Where Are The Girls? Gender Differences In Secondary Science And Math Grades, Jeff Matthew Ommen Jan 1995

Where Are The Girls? Gender Differences In Secondary Science And Math Grades, Jeff Matthew Ommen

UNLV Retrospective Theses & Dissertations

To investigate gender differences in secondary science and math grades, I used a cumulative numerical grade, a method to reduce a single student's many grades into a single number. Subjects were 640 students, who graduated from two small, mid-west high schools from the years of 1986-1993. Gender differences in cumulative numerical grades were not continuously supported in single class tests, in single school tests, or combined school tests. There were instances gender differences in cumulative numerical grade were upheld, however. A definite interaction was evident between math and science cumulative numerical grades. The differences between male and female cumulative numerical …

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