Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2004

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 12421 - 12450 of 13447

Full-Text Articles in Entire DC Network

Impacts Of Different Types Of Volatile Fatty Acids On The Bacterial Selection In Enhanced Biological Phosphorus Removal Systems, Jose Christiano Machado Jan 2004

Impacts Of Different Types Of Volatile Fatty Acids On The Bacterial Selection In Enhanced Biological Phosphorus Removal Systems, Jose Christiano Machado

UNLV Retrospective Theses & Dissertations

The impacts of different carbon sources, particularly VFAs, on EBPR's microbial population were investigated using T-RFLP and FISH. System performance and both general and specific microbial changes were investigated in SBR systems fed with acetate, propionate, butyrate, valerate, and glucose. Acetate and a mixture of acetate and propionate promoted the best P-removal. Butyrate and valerate lead the systems to fail in the long run. Glucose and propionate promoted poor EBPR, but the performance of the system fed with propionate improved with time. T-RFLP results indicated that short carbon chain VFAs, long carbon chain VFAs, and non-VFA favored different microbial populations …

Go to article

Trace Element Geochemistry Of Groundwater Flow Systems In Southern Nevada And Eastern California, Xiaoping Zhou Jan 2004

Trace Element Geochemistry Of Groundwater Flow Systems In Southern Nevada And Eastern California, Xiaoping Zhou

UNLV Retrospective Theses & Dissertations

The Nevada Test Site (NTS) was used for underground nuclear tests before the 1960's. Yucca Mountain in southern Nevada has been proposed as the site for the first high-level radioactive waste repository in the U.S. Because groundwater is a likely medium for transporting radio-nuclides to the accessible environment, determining the nature and path of groundwater movement through the aquifers at the NTS and Yucca Mountain is a critical task for assessing the risks and the future performance of the repository. In this study, systematic investigations of major ion and trace [mainly rare earth element (REE)] element geochemistry were conducted on …

Go to article

Vectors, Polluters, And Murderers: Hiv Testing Policies Toward Prostitutes In Nevada, Cheryl L Radeloff Jan 2004

Vectors, Polluters, And Murderers: Hiv Testing Policies Toward Prostitutes In Nevada, Cheryl L Radeloff

UNLV Retrospective Theses & Dissertations

This case study explores HIV testing policy and prostitution in Nevada. Three general themes emerge from analysis of Nevada's HIV/AIDS policy regarding prostitution. First, HIV testing policies reflect and reproduce hegemonic sexuality-specifically gender inequality, heterosexist orientation, and negative stereotypes of prostitutes. Second, Nevada's legalized prostitution industry makes visible the effects of economic dynamics, specifically tourism, on policies related to sexuality. Finally, the policymaking process depicts conflict between two approaches to regulation: the punitive control measures favored by law enforcement, and prevention and public health strategies favored by health bureaucracies. Testing prostitutes for HIV became the dominant policy response to an …

Go to article

Virtual Learning Community: A Student Exit Survey And Qualitative Framework, David C Diramio Jan 2004

Virtual Learning Community: A Student Exit Survey And Qualitative Framework, David C Diramio

UNLV Retrospective Theses & Dissertations

As the mystery and intrigue surrounding technology use in higher education dissipates, the time has come to bring technological initiatives, such as distance education, into the fold with the rest of campus in terms of assessment, accountability, and policy. Although online education shows promise for setting the collegiate learning experience free from the confines of the lecture hall, new challenges are emerging. For example, attrition rates for courses delivered via the Internet are higher than average, typically ten percentage points higher in online courses than in the traditional campus classroom. In an era of declining resources and renewed interest in …

Go to article

A Quantitative Investigation Of American History Software On Middle School Student Achievement Scores, Karla V Kingsley Jan 2004

A Quantitative Investigation Of American History Software On Middle School Student Achievement Scores, Karla V Kingsley

UNLV Retrospective Theses & Dissertations

The purpose of this quasi-experimental study was to examine whether student use of the Ignite! Early American History software significantly affected student outcome achievement scores on a standards-based assessment. Students in three urban middle schools were divided into experimental and control groups with both groups being taught by the same teacher. Experimental group students used the Ignite! history software as a supplement to their regular American history curriculum, and students in the control group did not use the program. The study also examined how students with limited English proficiency (LEP) and students with special needs scored on the standardized test …

Go to article

Engaging Young People In Democracy, Hilarie Hicks Robison Jan 2004

Engaging Young People In Democracy, Hilarie Hicks Robison

UNLV Retrospective Theses & Dissertations

As young people's civic and political participation continues to decline, a number of organizations are working to reverse the decline by increasing opportunities for youth to participate. Communities around the country are taking steps to engage young people through a variety of methods that allow youth to actually participate in policy development and take action on local issues. The effectiveness of such community programs on long-term civic engagement is not well documented, however. This paper presents preliminary research about the effectiveness of one community participation program, the Southern Nevada Water Authority's Youth Advisory Council. Quantitative and anecdotal evidence, while not …

Go to article

Cultivation Of Fear Of Blacks In Las Vegas Television News Media, Mark Leigh Curry Jan 2004

Cultivation Of Fear Of Blacks In Las Vegas Television News Media, Mark Leigh Curry

UNLV Retrospective Theses & Dissertations

This study was a content analysis of Las Vegas television news ( N = 1,145) and was designed to determine whether the potential exists for media consumers in the Las Vegas market to become fearful due to the overrepresentation of crime committed by Black offenders. One research question and two hypotheses were generated for this study. Research question one asked if there was an inverse relationship existing between media reports of index crimes and actual data offered by the State of Nevada Department of Motor Vehicles and Public Safety, and was supported. There was partial support for hypothesis one. Results …

Go to article

Language, Conflict And Identity: The Hispanic Experience, Jan Henry Oller Jan 2004

Language, Conflict And Identity: The Hispanic Experience, Jan Henry Oller

UNLV Retrospective Theses & Dissertations

This thesis is an attempt to create a theoretical model which could be applied to the study of any situation where a history of ongoing migration and asymmetrical power relationships in constant flux between two or more groups, nation states, or other entities is present. It is the conception and application of a theoretical framework with which to view transnational identity on a different level, one focusing on the historical antecedents of current situations, pan-identities, and language as the main identity marker among transnationals.

Go to article

Effect Of Heat Treatment On Deformation And Corrosion Behavior Of Type 422 Stainless Steel, Venkata Nagarjuna Potluri Jan 2004

Effect Of Heat Treatment On Deformation And Corrosion Behavior Of Type 422 Stainless Steel, Venkata Nagarjuna Potluri

UNLV Retrospective Theses & Dissertations

High temperature tensile properties of quenched and tempered martensitic Type 422 stainless steel, a target structural material, have been evaluated in this study at temperatures ranging from ambient to 600°C as a function of three different tempering times. Results of tensile testing indicate that the ultimate tensile strength, yield strength and failure strength were gradually reduced with increasing temperature. However, as expected, the ductility parameters were enhanced due to increased plastic flow at elevated temperatures. The results of stress corrosion cracking tests performed by slow strain rate technique in the 90°C acidic solution revealed higher failure stress and reduced ductility …

Go to article

Positively Identifying Children As Citizens: A Call For Parallel Due Process Rights, Margot Elizabeth Rudy Jan 2004

Positively Identifying Children As Citizens: A Call For Parallel Due Process Rights, Margot Elizabeth Rudy

UNLV Retrospective Theses & Dissertations

This work addresses the need for parallel due process rights for children by investigating the nature of juvenile welfare policies that affect abused and neglected children by focusing on the Adoption Safe Families Act. Upon the settlement of the U.S., common law from England, known as parens patriae, has governed the juvenile justice system. This common law has recognized children are indeed a State interest and that a child is a different type of citizen than an adult. Because children are dependant on their parents and not seen as full-fledged citizens, the State has assumed the responsibility of ensuring that …

Go to article

Ideology And Interaction In Internet Action Video Games, Marshall David Smith Jan 2004

Ideology And Interaction In Internet Action Video Games, Marshall David Smith

UNLV Retrospective Theses & Dissertations

This thesis is an analysis of how the play mechanics of the Return to Castle Wolfenstein videogame influence player cooperation and competition during play as well as an analysis of player chat as indication of cooperation and competition. While the premise of the game is competition the play mechanics of the game were found to induce intricate and extensive cooperation among players. In this study, player communication was primarily focused on achieving game goals, however there was also communication for cooperative efforts. The play mechanics of the game significantly influences the experience of players. Further research must be conducted to …

Go to article

Organizational Ethics And Maintaining An Ethical Environment Through Employee Involvement, Julie Ann Tousa Jan 2004

Organizational Ethics And Maintaining An Ethical Environment Through Employee Involvement, Julie Ann Tousa

UNLV Retrospective Theses & Dissertations

With the promulgation of the Federal Sentencing Guidelines in 1991 organizations as a whole began implementing Ethics Programs. Greater attention was being given to organizational behavior and the courts were now able to hold organizations accountable for misconduct with stronger sanctions; Organizations have now had more than ten years to implement their Ethics Programs for effectiveness. Yet today we see numerous cases of unethical decisions in organizations, most of them having Ethics Programs or Codes of Ethics in place, with results of the unethical behavior being as serious as loss of life, trust, millions of dollars, employment etc; It appears …

Go to article

Elevated Temperature Mechanical Properties And Corrosion Characteristics Evaluation Of Alloy Ht-9, Bhagath Yarlagadda Jan 2004

Elevated Temperature Mechanical Properties And Corrosion Characteristics Evaluation Of Alloy Ht-9, Bhagath Yarlagadda

UNLV Retrospective Theses & Dissertations

This thesis presents the results of tensile testing, stress corrosion cracking (SCC) and localized corrosion studies of Alloy HT-9, which is currently being considered as a target structural material for transmutation applications. The results of tensile testing indicate that the yield strength and the ultimate tensile strength were gradually reduced with increasing temperature, but the ductility parameters were enhanced due to increased plastic deformation, irrespective of the tempering time. The results of SCC testing in the 90°C acidic solution, performed by the slow-strain-rate (SSR) technique, revealed higher failure stress (sigmaf) at longer tempering time. Localized corrosion studies conducted by polarization …

Go to article

A Comparison Of Video And Illustrated Audio As An Instructional Tool, Christopher E Zakrzewski Jan 2004

A Comparison Of Video And Illustrated Audio As An Instructional Tool, Christopher E Zakrzewski

UNLV Retrospective Theses & Dissertations

This study examines the differences in the acquisition of procedural knowledge between the utilization of video versus illustrated audio as an instructional tool. One hundred and forty-five students from two major southwestern universities participated in the study. Results indicate that there are no differences in the acquisition of procedural knowledge between using these instructional tools. It was also determined that several participant demographic characteristics and a participant's learning style---determined by the Gregorc Style Delineator---did not significantly moderate their acquisition of procedural knowledge.

Go to article

Cfd Analysis Of Three-Dimensional Thermalhydraulics Flow Effects On Wall Concentration Gradient Profiles For Lbe Loop Fittings, Narain Armbya Jan 2004

Cfd Analysis Of Three-Dimensional Thermalhydraulics Flow Effects On Wall Concentration Gradient Profiles For Lbe Loop Fittings, Narain Armbya

UNLV Retrospective Theses & Dissertations

The objective of the thesis is to study the effects of thermalhydraulics flows on the wall concentration gradient profiles in LBE loop fittings. To that end detailed models of the fittings have been constructed to study these effects. These fittings include sudden expansion, sudden contraction, t-joint and elbow. The typical flow rates chosen for these simulations are typical of design criteria chosen for the Loop with Reynolds numbers expected around 200,000 and the usual axial temperature profiles which are being characterized in the DELTA loop at LANL. STAR-CD is the simulation package used to make these predictions, which include detailed …

Go to article

Prediction Of Struvite Formation Potential In Ebpr Digested Sludge Using Mass Balances, Batch Precipitation Tests, And Chemical Equilibrium Modeling, Hyunju Jeong Jan 2004

Prediction Of Struvite Formation Potential In Ebpr Digested Sludge Using Mass Balances, Batch Precipitation Tests, And Chemical Equilibrium Modeling, Hyunju Jeong

UNLV Retrospective Theses & Dissertations

Digested sludge liquors from wastewater treatment plants that include enhanced biological phosphorus removal (EBPR) in their treatment process have the potential to form struvite (MgNH4PO4·6H 2O). The potential can be determined by the concentrations of struvite constituents including phosphorus, ammonium, and magnesium. Phosphorus concentration of digested sludge liquors is expected to increase when EBPR is introduced to wastewater treatment plants because phosphorus accumulating organisms (PAOs) can accumulate phosphorus beyond their metabolic needs and phosphosphorus can be relased when they are digested anaerobically. The work presented in this thesis focuses on determining the potential for struvite formation at the City of …

Go to article

Ellis Island: The Public And Personal Representations Of The Immigrant Experience, Tara Maras Jan 2004

Ellis Island: The Public And Personal Representations Of The Immigrant Experience, Tara Maras

UNLV Retrospective Theses & Dissertations

Between 1892 and 1954, more than 12 million immigrants arrived at Ellis Island's shores for the promise of a new beginning in America. During this period of immigrant influx and in the decades to follow, anti-immigrant sentiment remained at the forefront of the collective American conscious, varying in severity, though ever present. This study compares the relationship between the personal stories of immigrants and the print media's account of immigration in Ellis Island's peak year, 1907, in an attempt to understand how storytelling, as communication, helped shape the collective immigrant experience. It also examines how the relationship contributes to U.S. …

Go to article

Computational Simulation Of Internal Blast Loading On Containment Vessels, Kiran Kumar Matta Jan 2004

Computational Simulation Of Internal Blast Loading On Containment Vessels, Kiran Kumar Matta

UNLV Retrospective Theses & Dissertations

Blast containment vessels can be an important tool for the temporary storage of explosive materials. They could be used in emergency situations for containment of explosives in public places or they could be used for planned detonations of explosive materials. The objective of this work is to verify the design procedure, and then optimize the structure for various performance levels. The near-term goal is to determine an analysis method that can accurately predict the response of a composite vessel. Various models of the containment were discussed in this report from simple to the more realistic models. Effectiveness of various models …

Go to article

Current Video Compression Algorithms: Comparisons, Optimizations, And Improvements, Douglas Scott Price Jan 2004

Current Video Compression Algorithms: Comparisons, Optimizations, And Improvements, Douglas Scott Price

UNLV Retrospective Theses & Dissertations

Compression algorithms have evolved significantly in recent years. Audio, still image, and video can be compressed significantly by taking advantage of the natural redundancies that occur within them. Video compression in particular has made significant advances. MPEG-1 and MPEG-2, two of the major video compression standards, allowed video to be compressed at very low bit rates compared to the original video. The compression ratio for video that is perceptually lossless (losses can't be visually perceived) can even be as high as 40 or 50 to 1 for certain videos. Videos with a small degradation in quality can be compressed at …

Go to article

An Examination Of Interactions Between Computer Support Staff And End Users, Kim Mia Price Jan 2004

An Examination Of Interactions Between Computer Support Staff And End Users, Kim Mia Price

UNLV Retrospective Theses & Dissertations

For those employed as information technology support professionals, the message they are receiving is that communication skills are as important as any credential or certification they may possess in terms of staying competitive in the current job market. The goal of this study was to determine the importance of communication skills in interactions between information technology support staff and the end users they support in relation to factors such as stereotypes and expectations. The results of this study suggest that positive end user evaluations of these communication interactions do not rely solely upon the communication skills of the technician, but …

Go to article

Tropi Can Can: Race And Performance In '50s Las Vegas, Malcolm Womack Jan 2004

Tropi Can Can: Race And Performance In '50s Las Vegas, Malcolm Womack

UNLV Retrospective Theses & Dissertations

In 1955 the Jim Crow resort town of Las Vegas opened its first interracial hotel/casino, the Moulin Rouge, and staged its first all-black production show, the Tropi Can Can revue. On the Cafe Rouge stage were the wild antics Stump & Stumpy, bringing a sad reminder of the past; the romantic music of the Platters, bringing a hopeful note for the future; and the very non-traditional showgirls, bringing a host of audience expectations about the immediate present; This paper attempts to deconstruct and analyze that show and the theatrical elements of the resort, the differing experiences of white and black …

Go to article

Instrumentation Of Ysz Oxygen Sensor Calibration In Lead-Bismuth Eutectic, Xiaolong Wu Jan 2004

Instrumentation Of Ysz Oxygen Sensor Calibration In Lead-Bismuth Eutectic, Xiaolong Wu

UNLV Retrospective Theses & Dissertations

Although liquid lead-bismuth eutectic (LBE) is a good candidate for the coolant in the subcritical transmutation blanket, it is also known to be very corrosive to stainless steel, the material of the carrying tubes and the containers. Such a corrosion problem can be prevented by producing and maintaining a protective oxide layer on the exposed surface of stainless steel. Proper formation of the oxide layer critically depends on the accurate measurement and control of the oxygen concentration (tens of ppb levels) in the liquid LBE. An Oxygen Sensor Calibration/Measurement Apparatus is designed and built to deliberately calibrate the Yttria Stabilized …

Go to article

A Study Of Pre And Post Cold War Presidential International Crisis Rhetoric, Flora Anne Jackson Jan 2004

A Study Of Pre And Post Cold War Presidential International Crisis Rhetoric, Flora Anne Jackson

UNLV Retrospective Theses & Dissertations

This study examines three speeches delivered by U.S. presidents during times of international crises, Woodrow Wilson's speech on April 2, 1917, George H. W. Bush's speech delivered on January 16, 1991, and the speech by George W. Bush delivered on September 20, 2001. Elements of epideictic, deliberative and forensic strategies were applied to the discourse to determine whether the speeches conformed to expectations for presidential international crisis rhetoric. This thesis extends a study completed in 1989 in which Bonnie J. Dow argued that only epideictic and deliberative strategies appear in international crisis rhetoric. In contrast, this study found that, in …

Go to article

Gender Parity In Political Coverage: A Content Analysis Of Major Kenyan Newspapers, Kulamo C Bullo Jan 2004

Gender Parity In Political Coverage: A Content Analysis Of Major Kenyan Newspapers, Kulamo C Bullo

UNLV Retrospective Theses & Dissertations

Media coverage of parliamentary races should be fair and issue-oriented. This study examined the newspaper coverage of the 2002 Kenyan parliamentary elections for the seats in which there were both male and female contestants. The study examined three national newspapers from the day parliament went on recess, signaling beginning of campaigns, to eve of elections. Four hypotheses postulating differences in quantity and quality of coverage for both male and female candidates were tested and support found for all the hypotheses. The findings indicate differences in the media coverage of male and female politicians during election campaigns. Female candidates are likely …

Go to article

Survival Of Enterococcal And Streptococcal Species In Natural Waters, Kameron L Entrekin Jan 2004

Survival Of Enterococcal And Streptococcal Species In Natural Waters, Kameron L Entrekin

UNLV Retrospective Theses & Dissertations

Survival capabilities of indicators of fecal pollution, such as enterococci, in the natural aquatic environment are of particular importance in proper management of a watershed. The Las Vegas Wash (LVW) is a naturally occurring and engineered tributary to Lake Mead; The ability of the Las Vegas Wash to sustain microbial viability over time was assessed utilizing ATCC cultures and environmentally isolated species. Wash water samples were autoclaved and seeded with known concentrations of enterococci. Microcosms were incubated at 25°C, and decline was measured by heterotrophic plate counts at specific time intervals. Results of survival studies using ATCC derived species showed …

Go to article

Abuse Histories Among Female Inmates, Magann Jordan Jan 2004

Abuse Histories Among Female Inmates, Magann Jordan

UNLV Retrospective Theses & Dissertations

The current study explores the extent and the consequences of one's prior history of physical and sexual abuse on criminal behavior of female offenders. Using a sample of incarcerated women, it will first investigate the prevalence of prior abuse (sexual and physical) among female offenders. Survey responses will then be analyzed to assess psychological problems and possible criminal patterns that are related to abuse history. Specifically, the study examines whether prior abuses are risk factors for committing particular types of criminal offenses. The results of this study are then discussed in terms of their implication for criminological theory and public …

Go to article

Specialization In The Criminal Careers Of Sex Offenders, Jodi K Olson Jan 2004

Specialization In The Criminal Careers Of Sex Offenders, Jodi K Olson

UNLV Retrospective Theses & Dissertations

Recent public policy has been implemented with the assumption that sex offenders are highly motivated and tend to exhibit specialization and compulsivity in their offending patterns. Past research has not been able to confirm or invalidate this assumption, and has reflected many inconsistencies when drawing conclusions about sex offender profiles and career trajectories; Drawing upon a national sample of offenders, the current study examines the degree of specialization in the criminal careers of sex offenders and other groups of offenders. Results from the adjacent specialization analyses of the general offense categories indicated that sex offenders are among the least specialized …

Go to article

Impact Of Various Forms Of Participation On Citizens' Trust In Ukraine, Vladyslav Galushko Jan 2004

Impact Of Various Forms Of Participation On Citizens' Trust In Ukraine, Vladyslav Galushko

Theses and Dissertations

No abstract provided.

Go to article

Client Perceptions Of Child Protective Services, Jerry L Rohleder Jan 2004

Client Perceptions Of Child Protective Services, Jerry L Rohleder

UNLV Retrospective Theses & Dissertations

Inductive research methods are used to explore client perceptions of Child Protective Services in Clark County, NV. Interviews with fifteen persons who had experiences with CPS are discussed. The small sample limits the generalizability of the results, but there are indications the type of help offered or received is not always what a particular client perceives is needed, they are dissatisfied with the way they are treated, and they are not aware of any mechanisms available to register disagreements. Many of the clients express feelings of alienation and anomie. Suggestions for improving this relationship include changes in reporting procedures, showing …

Go to article

Flux Profile Modelling Using Numerical Methods, Bharat Reddy Pemmireddy Jan 2004

Flux Profile Modelling Using Numerical Methods, Bharat Reddy Pemmireddy

UNLV Retrospective Theses & Dissertations

Molecular beam Epitaxy (MBE) is a physical vapor deposition system, used to grow semiconductor layers (epilayers). In order to increase the economics of MBE, the industry has increased the size and number of wafers processed in one stage. This lead to, non-uniformity in thickness of material grown. In this work a process simulation tool based on numerical methods was developed to study different parameters which affect the thickness. The process of emission in open cells was identified as free evaporation and for computer simulation of these types of cells Model I was developed. The process of emission in closed cells …

Go to article

First Prev Next Last