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Development Of Passenger Car Equivalents For Freeway Merging Sections, Amanpreet Singh Ahuja
Development Of Passenger Car Equivalents For Freeway Merging Sections, Amanpreet Singh Ahuja
UNLV Retrospective Theses & Dissertations
The Highway capacity manual (HCM, 2000) uses the Passenger Car Equivalents (PCE) to estimate the impact of trucks on freeways. PCE values for trucks recommended by HCM 2000 for level terrain are same under different truck percentages and different freeway conditions such as merging, diverging, weaving section etc. Several studies have shown that the PCE values vary for different traffic conditions such as for weaving, over-saturated conditions, etc. The objective of this thesis is to develop the PCE values for freeway merging sections using simulation software CORSIM. The equal density methodology is used to compute the PCE values. For this …
Development And Validation Of The Facial Affect Learning And Memory Test (Falmt) And Facial Identification Of Affect Task (Fiat), Christina Marie Armstrong
Development And Validation Of The Facial Affect Learning And Memory Test (Falmt) And Facial Identification Of Affect Task (Fiat), Christina Marie Armstrong
UNLV Retrospective Theses & Dissertations
The neurocognitive assessment of visuospatial memory has begun to receive attention and has been recognized as being important in the understanding of overall memory processing. Additionally, there has been an increased emphasis on emotion processing, particularly affect discrimination and attention bias. However, little information is currently available on learning and memory for emotional information. Because emotion is expressed to a large extent through nonverbal means, a nonverbal test of emotion learning would be valuable, although no such test currently exists. The aim of the current study was to establish normative performance characteristics, convergent and divergent validity for two newly developed …
The Relationship Between Project Characteristics And The Expert Estimation Of Software Development And Maintenance, John Farrish
The Relationship Between Project Characteristics And The Expert Estimation Of Software Development And Maintenance, John Farrish
UNLV Retrospective Theses & Dissertations
Accurately estimating the amount of time and effort required to complete a software development or maintenance project has proven problematic for business. A wealth of literature exists exploring each of the methods for estimating software development, but very little is devoted to understanding how project characteristics relate to estimation accuracy. This research examines expert estimation, the most widely used estimation technique, to determine the relationship between software project characteristics and estimation accuracy. Implications of the findings for research and practice are discussed.
The Effect Of Temperature On Development And Behavior Of Relict Leopard Frog Tadpoles (Rana Onca), Jeffrey Abraham Goldstein
The Effect Of Temperature On Development And Behavior Of Relict Leopard Frog Tadpoles (Rana Onca), Jeffrey Abraham Goldstein
UNLV Retrospective Theses & Dissertations
Relict Leopard frogs (Rana onca) are found in thermal springs with water temperatures in excess of 30°C at the source but it's unknown whether tadpoles require reintroduction sites with specific thermal conditions for development. Tadpole survivorship at 20, 25 and 30°C was 84, 93.8, and 66%, respectively, while none survived at 35°C. Time to metamorphosis was significantly shorter for 25°C acclimation group (62+/-8 days) followed by the 30° (106+/-51 days) and 20°C (260+/-47 days) acclimation groups. Development was arrested in the 15°C acclimated group and survivorship declined to 63.8% after 191 days. However, 80% of the surviving larvae completed metamorphosis …
Characteristics And Success Of Information Systems Development Efforts In Public School Systems, Kim R Syverson
Characteristics And Success Of Information Systems Development Efforts In Public School Systems, Kim R Syverson
UNLV Retrospective Theses & Dissertations
This thesis discusses the differences between traditional businesses and schools regarding information system project management, by analyzing several project characteristics and how they affect educational end-user perceptions of system successes. While many other businesses have mastered the project management processes, school districts are just now beginning to see that such processes and techniques are even necessary; Here we use survey data from school teachers and administrators, along with two case studies to investigate factors that impact the success of information system development projects among Nevada public schools. The results highlight areas that are either currently lacking, or need to be …
Development Of A Flood Forecasting Model For Flamingo Tropicana Watershed In The Las Vegas Valley, Satya Prakash Chataut
Development Of A Flood Forecasting Model For Flamingo Tropicana Watershed In The Las Vegas Valley, Satya Prakash Chataut
UNLV Retrospective Theses & Dissertations
Floods are among the most frequent natural phenomenon that occur due to excessive precipitation. Accurate and current forecasting of floods is necessary to avoid social and economic losses. Forecasting floods in an event of intense rain allows the concerned agencies to adopt appropriate measures such as warnings and evacuations and to initiate corrective and remedial efforts before disaster strikes (Chapman and Canaan, 2001); Las Vegas has experienced rapid population growth since the 1990s. This has brought large-scale increase in impervious land surface due to the expansion of residential, commercial, and industrial area in the valley. The increase in impervious area …
Development Of In-Cylinder Injection For A Hydrogen-Fueled Internal Combustion Engine, Ronald L Fifield
Development Of In-Cylinder Injection For A Hydrogen-Fueled Internal Combustion Engine, Ronald L Fifield
UNLV Retrospective Theses & Dissertations
Traditional means for converting an engine to operate on hydrogen fuel incorporates port injection. The typical method for controlling emissions on a port injection engine is to operate the engine lean (typical AFR of 70:1) and/or incorporate an EGR system. The result of utilizing these methods is an appreciable reduction in power output. In-cylinder injection of an internal combustion engine provides a reliable method for delivering hydrogen fuel whereby fuel efficiency, power output and emissions levels are improved. Injection of hydrogen directly into the combustion chamber allows control of various factors such as burn rate and combustion timing which influence …
Development Of A Safety Analysis And An Intersection Infrastructure System, Ancila V Kaiparambil
Development Of A Safety Analysis And An Intersection Infrastructure System, Ancila V Kaiparambil
UNLV Retrospective Theses & Dissertations
GIS and GPS technologies have found immense applications in the field of transportation engineering. Different features related to transportation safety are inventoried using these technologies. The databases so created serve as main source for safety analyses, decision making and reporting. Many different analyses tools are available to assist engineers, planners and policy makers in the process of improving transportation safety. GIS-based analyses tools provide tabular and graphic display, thereby expediting the analyses process and improving the spatial understanDing The advantages of such tools increase if they can be provided on the World Wide Web. One such software system that offers …
Development And Testing Of An Advanced Photovoltaic Receiver, Marc A Newmarker
Development And Testing Of An Advanced Photovoltaic Receiver, Marc A Newmarker
UNLV Retrospective Theses & Dissertations
In August of 2004, the SAIC solar concentrator located at UNLV was retrofitted with a 24 module photovoltaic aperture in hopes of producing a new type of solar electric concentrator. Alter the initial solar testing began, it became very apparent that the receiver design did not supply adequate cooling of the silicone cells, leading to module deformation and eventual failure. Through investigative studies of the failure and the possible solutions to the problem put forth at NREL and UNLV, a second phase array of mechanically sealed photovoltaic modules was constructed and tested. With a new methodology implemented in phase two, …
Presidential Transitions During Capital Campaigns: Perspectives Of Chief Development Officers, Kimberly Kay Nehls
Presidential Transitions During Capital Campaigns: Perspectives Of Chief Development Officers, Kimberly Kay Nehls
UNLV Retrospective Theses & Dissertations
In the past few decades, capital campaigns at institutions of higher education have increased in duration, while collegiate presidential tenures have been doing just the opposite. Turnover in the top post was frequent, even during major fundraising campaigns. Prior to this study, presidential transitions during campaigns had not been previously analyzed. Therefore, the objective of this exploratory study was to better understand presidential transitions during capital campaigns from the perspective of the chief development officer (CDO) who maintained continuity. Nine CDOs who experienced presidential transitions during campaigns were interviewed to better understand their experience. The institutions represented were Florida State …
Development Of Seat Shock Isolation Systems, Erik Wolf
Development Of Seat Shock Isolation Systems, Erik Wolf
UNLV Retrospective Theses & Dissertations
A numerical model has been created to predict the behavior of seat shock isolation systems exposed to mine blast loaDing The model is a two dimensional, five degree-of-freedom, rigid body, mass-spring-damper approximation of the seat system and human occupant. The outputs of the model are the positions, velocities, and accelerations of the system masses, the forces of the connecting elements, such as the seat cushion force, the load limiter force, the spinal force, and the Dynamic Response Index (DRI) based on the pelvic z-axis acceleration. The model has been calibrated with drop tower test data collected by the Army Research …
A Model Of The Interplay Of Culture And Immigration Stress In The Development And Maintenance Of Alcohol-Related Disorders In Hispanic/Latino Immigrants, Marilyn J Strada
A Model Of The Interplay Of Culture And Immigration Stress In The Development And Maintenance Of Alcohol-Related Disorders In Hispanic/Latino Immigrants, Marilyn J Strada
UNLV Retrospective Theses & Dissertations
The Hispanic/Latino population represents the largest ethnic minority group in the United States, with immigrants comprising a substantial portion of this population. For both U.S.-born and immigrant Hispanic/Latinos, alcohol abuse and dependence is of particular concern given their reported high prevalence rates, the severe alcohol-related consequences that they experience, and the various barriers to obtain treatment that they encounter. In comparison to members of other ethnic groups, Hispanics/Latinos have the lowest rates of perceived need for treatment, the lowest past and current rates of participation in treatment and the highest dropout rates after attending just one counseling session. Although there …
Exploring Relationships Between Configurations Of Technology Use And Professional Development Among Ces Teachers, Andrew Hyrum Mcarthur
Exploring Relationships Between Configurations Of Technology Use And Professional Development Among Ces Teachers, Andrew Hyrum Mcarthur
UNLV Retrospective Theses & Dissertations
The purpose of this study was to determine the effect recent technology integration was having on teaching in the Church Education System (CES). Specifically, this study sought to identify (a) different configurations of technology use; (b) different forms and processes of support; and (c) examine the relationships between the two. Education change theory, particularly the Concerns-Based Adoption Model, was used to guide the research. An Innovation Configuration (IC) Map was developed and used to collect data. Three configurations of use were identified: Independent---teachers who proactively learned technology on their own and implement it well; Interdependent---teachers who are fairly new to …