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Model Of Early Universe With H+2, Tae Song Lee
Model Of Early Universe With H+2, Tae Song Lee
UNLV Retrospective Theses & Dissertations
The aim of this thesis is to improve existing models of the Early Universe by adding vibrationally resolved reactions to a standard model. Stancil, Lepp, and Dalgarno (1996, 1998) have developed a standard chemical model for molecules in the Early Universe. Galli and Palla (1998) have shown that vibrational excitation may be important in this model by forcing the vibrational level of H+2 to be either v=0 or v=9. I studied a consistent model for the vibrational levels including level dependent formation and destruction as well as transition between the levels.
Extending The Delone And Mclean Information Systems Success Model For E-Commerce Website Success, Joy Wendy Wu
Extending The Delone And Mclean Information Systems Success Model For E-Commerce Website Success, Joy Wendy Wu
UNLV Retrospective Theses & Dissertations
Website evaluation can continuously improve the performance of websites and increase sales. However, the lack of a comprehensive framework as guidance hampered this task. The main purpose of this research is to provide a comprehensive framework for e-commerce websites evaluation by extending the DeLone and McLean Information System Success Model. A new dimension---"Relationship quality" is proposed to the model. The study also tries to identify characteristics of e-commerce websites that impact the user's satisfaction; A survey questionnaire was distributed to web users, and a total of 295 responses were obtained. The data was processed through Statistical Package for the Social …
A Model For Programming Characteristics Of Sonos Type Flash With High-Kappa Dielectrics, Varun Jain
A Model For Programming Characteristics Of Sonos Type Flash With High-Kappa Dielectrics, Varun Jain
UNLV Retrospective Theses & Dissertations
Silicon Oxide Nitride Oxide Silicon (SONOS) FLASH memories have recently gained a lot of attention due to better retention and scaling opportunities over the conventional Floating Gate FLASH memories. The constant demand for device scaling, to attain higher density, higher performance, and low cost per bit, has posed charge leakage problems. SONOS type devices with high-kappa storage layers and/or high-kappa blocking oxide have been proposed to alleviate the demand for constant tunnel oxide scaling. In comparison to conventional FLASH, these devices operate at lower voltages, exhibit higher programming speeds, comparable retention times, less over-erase problem and better compatibility with low …
Examining Women Faculty Experiences Using The Model Of Human Occupation Perspective: A Qualitative Approach In One Community College, Christine R Privott
Examining Women Faculty Experiences Using The Model Of Human Occupation Perspective: A Qualitative Approach In One Community College, Christine R Privott
UNLV Retrospective Theses & Dissertations
Occupations for women in the academy have been changing over the last century. Contemporary studies that have looked at women faculty work have been mixed in their findings about the relationship between gender and job satisfaction. Few studies have focused on two-year-college models of women's experiences as faculty; Set in the context of occupational science theories, this qualitative study explored the daily work of women faculty in one community college. The concept of faculty work was viewed through Kielhofner's Model of Human Occupation, which suggests that occupations are made up of three subsystems of human action or doing: volition, habituation, …
Atmospheric Dispersion Model Validation For Low Wind Speed Conditions, Patrick Shawn Sawyer
Atmospheric Dispersion Model Validation For Low Wind Speed Conditions, Patrick Shawn Sawyer
UNLV Retrospective Theses & Dissertations
Atmospheric plume dispersion models are used for a variety of purposes including emergency planning and response to hazardous material releases, determining force protection actions in the event of a WMD attack and for locating sources of pollution. This paper provides a review of previous studies that examine the accuracy of atmospheric plume dispersion models for chemical releases. It considers the principles used to derive air dispersion plume models and looks at three specific models currently in use; ALOHA, EPIcode and SCIPUFF. Results from this study indicate over-prediction bias by the EPIcode and SCIPUFF models and under-prediction bias by the ALOHA …
Estimating The Effects Of Casino Marketing Activities On Slot Business Volume: A Model For Leisure Services Businesses, Lisa Birtciel Young
Estimating The Effects Of Casino Marketing Activities On Slot Business Volume: A Model For Leisure Services Businesses, Lisa Birtciel Young
UNLV Retrospective Theses & Dissertations
This study researched the effect of marketing promotions on gaming volume (i.e., coin-in). Specifically, this study attempted (1) to gain an understanding of the relationship between specific marketing promotions (slot tournaments, special events, product prize drawings, and no marketing promotions) and gaming volume; and (2) to estimate the magnitude of incremental revenue for each type of promotion. A conceptual model was proposed to examine the effect of the different types of marketing promotions on gaming volume, including two other variables (holidays and day-of-the-week) previously found to influence gaming volume; Secondary data were collected from a Las Vegas Strip property for …
A General Mathematical Model Of Stenoses, Jordan Jimmy Crabbe
A General Mathematical Model Of Stenoses, Jordan Jimmy Crabbe
UNLV Retrospective Theses & Dissertations
Incidence and the prevalence rate of stroke in the United States has been of great concern to the Centers for Disease Control and prevention (CDC), National Center for Health Statistics (NCHS), the American Society of Stroke, American Stroke Association and the U.S. government as a whole; Many mathematical models of the stroke problem have been proposed and solved using diverse methods and computations. Most of the models are based on the stenoses, occlusion or rupture of the artery and the formation of cerebral aneurysms, which all lead to the occurrence of stroke; This paper utilizes a direct approach to change …
Diffusion Model For Lightning Radiative Transfer Using Spherical Geometry, James Beguah Odei
Diffusion Model For Lightning Radiative Transfer Using Spherical Geometry, James Beguah Odei
UNLV Retrospective Theses & Dissertations
A one-speed Boltzmann transport theory, with diffusion approximations, is applied to study the radiative transfer properties of lightning in optically thick thunder clouds. The cloud is modeled in terms of spherical geometry and studies on the effects of multiple scattering are considered. Mathematically, the cloud is composed of a homogeneous distribution of spherical water droplets. Computationally, the cloud is treated as a nuclear reactor, with photons replaced by neutrons. Diffusion techniques common in nuclear reactor analyses are applied as in [1]. Relevant numerical techniques will be used to simulate the Cloud Results for the obtained intensity distribution will be compared …
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 …
A Diffusion Model Of Lightning Radiative Transfer Using Cylindrical Geometry, Rina Alfonso Santos
A Diffusion Model Of Lightning Radiative Transfer Using Cylindrical Geometry, Rina Alfonso Santos
UNLV Retrospective Theses & Dissertations
Clouds come in different shapes and sizes and are made up of different constituents. Realistic clouds are composed of heterogeneous distribution of constituents (ice particle, needle shaped objects, cubic, hexagonal, etc.). For tractability of solutions and smoothness of calculations, assumptions are made. The assumption is viable due to multiple scattering effect for propagation of radiation in random media. In Koshak et al. (1994), "Diffusion Model for Lightning Radiative Transfer", the cloud was treated as a nuclear reactor in order to obtain forms that can be readily computable and a simple geometry was chosen, i.e., a homogeneous rectangular parallelepiped Cloud In …
Creating And Testing The Higher Education Leadership Competencies (Helc) Model: A Study Of Athletics Directors, Senior Student Affairs Officers, And Chief Academic Officers, Zachary A Smith
UNLV Retrospective Theses & Dissertations
The purpose of this study was threefold: to extend existing knowledge of McDaniel's (2002) qualitative inquiry of higher education leadership competencies by testing her theory using quantitative methods; to either affirm or create a new, more refined model of higher education leadership competencies based on the results of the data analysis; and finally, to compare the similarities and differences of important competencies necessary for effective leadership between and within three groups of leaders in higher education: athletics directors (ADs), senior student affairs officers (SSAOs), and chief academic officers (CAOs); Goodness of fit results indicated McDaniel's 4-category model of higher education …