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Performance Evaluation Of Single And Double-Basin Solar Stills In Las Vegas, Nevada, Nanda Holur Venkatesh
Performance Evaluation Of Single And Double-Basin Solar Stills In Las Vegas, Nevada, Nanda Holur Venkatesh
UNLV Retrospective Theses & Dissertations
The objectives of this research were to conduct long-term testing of modified single-basin still designs, and to design, build and test an alternative double-basin still that may increase water production at the same or lower cost; Performance of two commercial single-basin still designs, from different suppliers, was evaluated over a 14-month period in Las Vegas, Nevada. The average daily water yields of SunwaterRTM and SolAqua(TM) ranged from 1.1+/-0.7 L/m2 and 0.9+/-0.5 L/m 2 (in winter) to 5.5+/-1.7 L/m2 and 4.6+/-0.9 L/m2 (in summer) respectively; Different configurations of cover glass and water volume/depth were evaluated on SunwaterRTM single-basin stills. Low-e glass …
Difference On Perception Of Evaluation Criteria Between Division I And Iii Head Basketball Coaches And Athletic Directors, Richard Robert Hilliard
Difference On Perception Of Evaluation Criteria Between Division I And Iii Head Basketball Coaches And Athletic Directors, Richard Robert Hilliard
UNLV Retrospective Theses & Dissertations
The purpose of this study was to compare the differences in perceptions of evaluation criteria between athletic directors and head basketball coaches at National Collegiate Athletic Association Division I and III institutions in the western region of the United States. The objective of this study was to answer the question, is there a difference in perceptions of evaluation criteria by athletic directors and Division I and III basketball coaches? The researcher modified a 39 item questionnaire developed by Overton (1997) into a 21 item survey. The survey was sent to athletic directors and head men's and women's basketball coaches at …
Evaluation And Modeling Of The Effect Of Midblock Pedestrian Crossings On Arterial Traffic, Naveen Kumar Veeramisti
Evaluation And Modeling Of The Effect Of Midblock Pedestrian Crossings On Arterial Traffic, Naveen Kumar Veeramisti
UNLV Retrospective Theses & Dissertations
Unsignalized midblock pedestrian crossings are one of the critical components of arterial streets designed to provide for safer crossing locations for pedestrians. These crossings are often placed between signalized intersections that are far apart. However when arterial segments with such crossings are being analyzed or designed, the effect of the crossings was not normally taken into consideration. This is primarily due to the inability of current traffic software in modeling these locations; The objective of this study was to evaluate the effect of midblock pedestrian crossings on the measures of effectiveness of arterial traffic flow using a computer simulation model. …
Evaluation Of The Impacts Of Emergency Vehicle Signal Preemption, Gang Xie
Evaluation Of The Impacts Of Emergency Vehicle Signal Preemption, Gang Xie
UNLV Retrospective Theses & Dissertations
Emergency vehicle signal preemptions are designed to give green light to responding emergency vehicles by "preempting" signals as they proceed through signalized intersections. A direct objective of signal preemption is to reduce response time for emergency vehicle while enhancing safety. However, signal preemptions interrupt regular signal operations and thus cause extra traffic delay to general traffic. Studies have been conducted on evaluating the effectiveness of signal preemption from the perspective of improving emergency vehicle response time. It has been found that these studies have been using traffic simulation models which cannot reflect the real traffic conditions, particularly associated with preemption. …
An Evaluation Of X-Ray Fluorescence Lead Detection Methods For Candy Wrappers, Louis J Abacherli
An Evaluation Of X-Ray Fluorescence Lead Detection Methods For Candy Wrappers, Louis J Abacherli
UNLV Retrospective Theses & Dissertations
Currently, it is expensive and time consuming for public health entities to test candy (and other consumer products) that has entered the consumer market in the United States. The XRF, on the other hand, provides a quick, economical, and easy method to test lead levels. It has been demonstrated in a variety of studies that x-ray fluorescence (XRF) can be used for testing lead levels in paint, soil, and testing in-vivo for bone. What has not been studied is the XRF's ability to test for lead in certain consumer items such as candy. This research was designed to identify XRF …
Conversion And Performance Evaluation Of A Hydrogen Powered Ford F-250 Pickup Truck, Julian J. L Gardner
Conversion And Performance Evaluation Of A Hydrogen Powered Ford F-250 Pickup Truck, Julian J. L Gardner
UNLV Retrospective Theses & Dissertations
The following thesis details all design, fabrication and analysis necessary for the conversion of a Compressed Natural Gas (CNG) powered full size pickup truck to run on compressed hydrogen gas. As an industry for hydrogen powered vehicles develops, adherence to a specified set of safety regulations is necessary to ensure the safety of vehicle end users. Currently accepted standards for hydrogen vehicle safety follow regulations put forth by NFPA for CNG powered vehicles. The design of the fuel system follows applicable hydrogen and CNG regulations. A potentially revolutionary fuel delivery system that consolidates a gaseous fuel injector and a spark …
Evaluation Of Quantitative Polymerase Chain Reaction For Measuring The Concentration Of Total Bacteria In Environmental Air Samples, Vanessa Louise Stevens
Evaluation Of Quantitative Polymerase Chain Reaction For Measuring The Concentration Of Total Bacteria In Environmental Air Samples, Vanessa Louise Stevens
UNLV Retrospective Theses & Dissertations
The air quality of both indoor and outdoor environments is a primary human health content, particularly for individuals that have asthma, respiratory ailments and immune disorders. Airborne microorganisms have been shown to cause a variety of diseases, allergic reactions, and irritations. Universal quantitative polymerase chain reaction (QPCR) was compared to the traditional methods of culture analysis and microscopy to determine if it was an effective method to quantitate total bacterial counts in environmental air samples. A composite standard curve was developed using four bacterial species and applied to laboratory cultures and environmental air samples. Two hypotheses were tested, (i) to …
An Evaluation Of Innovative Countermeasures For Pedestrian Safety, Vinay Virupaksha
An Evaluation Of Innovative Countermeasures For Pedestrian Safety, Vinay Virupaksha
UNLV Retrospective Theses & Dissertations
The objective of this research was to evaluate the effectiveness of innovative countermeasures deployed to help improve pedestrian safety and walkability. Potential countermeasures evaluated in this research include: (1) a portable speed trailer, (2) a high visibility crosswalks, (3) advance yield markings, (4) "yield here to pedestrians" signs, (5) in-roadway knockdown signs, (6) danish offsets, (7) median refuges, (8) intelligent transportation system (ITS) based automatic pedestrian detection device, (9) smart lighting, (10) pedestrian activated flashing lights; A before-and-after analysis strategy was be used to evaluate the selected countermeasures. Measures of effectiveness (MOEs) identified to evaluate the impacts of these countermeasures, …