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A Study Of Voltage Regulation And Islanding Associated With Distributed Generation, Chensong Dai
A Study Of Voltage Regulation And Islanding Associated With Distributed Generation, Chensong Dai
UNLV Retrospective Theses & Dissertations
Distributed generation (DG) is increasingly spreading in the form of solar power, wind power, and fuel cell power. These DGs are connected to the power grid in order to benefit the investors for their economical efficiency and reliability. However, the introduction of DGs, especially at a high level of penetration, brings hidden problems to the conventional power distribution system. The conventional power distribution system has only one direction for the power flow, i.e., from the substation to the end user. This situation may not hold with the introduction of DGs because the power flow may reverse direction in some parts …
Security Protocol Based On Random Key Generation For An Rfid System, Karthik Raghavan
Security Protocol Based On Random Key Generation For An Rfid System, Karthik Raghavan
UNLV Retrospective Theses & Dissertations
Radio Frequency Identification (RFID) is a technology, which describes the transmission of unique information by a wireless device, over Radio waves, when prompted or read by a compatible reader; The basic components in implementing RFID are RFID tags which are small microchips attached to a radio antenna, mounted on a substrate, and a wireless transceiver/reader that queries the RFID tags; This thesis deals with research issues related to security aspects in the communication between an RFID tag and its reader. More precisely, it deals with a new, simple and efficient security protocol based on an encryption that uses the concept …
Process Analysis And Simulation Of Solar Thermochemical Hydrogen Generation, Mohammad Arif Khan
Process Analysis And Simulation Of Solar Thermochemical Hydrogen Generation, Mohammad Arif Khan
UNLV Retrospective Theses & Dissertations
In this study three different kind of solar thermochemical cycles (methane reforming process, sulfur-iodine cycle and copper-chlorine cycle) have been analyzed to produce hydrogen gas. Methane reforming processes (steam methane reforming, partial oxidation and autothermal reforming) have been analyzed and simulation flowsheets have been developed. In this analysis, the temperature of all the reforming reactors are varied in the range of 500-1000 °C due to the transient nature of the solar energy. The results show that the POX reforming system is better than the other two systems for the production of the same amount of hydrogen from CH4; Process analysis …
Estimation Of Pedestrian Trip Generation Rates In Urban Areas, Pankaj Maheshwari
Estimation Of Pedestrian Trip Generation Rates In Urban Areas, Pankaj Maheshwari
UNLV Retrospective Theses & Dissertations
This study investigates factors that can be used to quantify average hourly pedestrian trips in urban areas and hence help in estimating pedestrian trips. Various models are developed for morning period, early and late evening periods, and an overall average hourly model was also developed depending on the type of the facilities near the high pedestrian activity locations. General linear regression modeling and other statistical methods are used to identify the significant factors. The best subset regression is used to model four different hourly pedestrian volumes and the F-test is used to support the analysis. The model is validated and …
Conceptual Modeling And Analysis Of A Solar Receiver For Thermochemical Hydrogen Generation, Derek Satoru Taguchi
Conceptual Modeling And Analysis Of A Solar Receiver For Thermochemical Hydrogen Generation, Derek Satoru Taguchi
UNLV Retrospective Theses & Dissertations
Hydrogen has the potential to revolutionize the way we live our everyday lives in the near future. With the global demand for oil increasing and pumping capabilities running at, or almost at full capacity, the world will eventually have to turn to alternative energy sources to satisfy the need for fuel in the near future; The processes involved in designing a system capable of hydrogen production include many different components. For the generation of hydrogen through a solar process, one of these components is the design and analysis of the solar receiver. The solar receiver is the component of the …
Reactor Modeling And Simulation For The Copper-Chlorine Thermochemical Solar Hydrogen Generation Process, Mohammed Yassin
Reactor Modeling And Simulation For The Copper-Chlorine Thermochemical Solar Hydrogen Generation Process, Mohammed Yassin
UNLV Retrospective Theses & Dissertations
Interest in hydrogen as a clean fuel has surged in the recent past as concerns over the costs of fossil fuels to the economy and environment have become paramount. As hydrogen burns only to produce water and can be used in efficient fuel cells, it has a great opportunity to be the replacement for carbon-based fuels in the twenty-first century. Hydrogen is an attractive fuel because it is renewable as an energy resource and it is also flexible as an energy carrier; Quantities of hydrogen gas on earth are limited, so it must be chemically derived from some other sources. …
Use Of Alloy 800h For Applications In Hydrogen Generation Using Nuclear Power, Vinay Virupaksha
Use Of Alloy 800h For Applications In Hydrogen Generation Using Nuclear Power, Vinay Virupaksha
UNLV Retrospective Theses & Dissertations
Alloy 800H, a candidate structural material for heat-exchangers to be used in nuclear hydrogen generation, was investigated for its high-temperature tensile properties and corrosion behavior. The tensile properties evaluated at different temperatures indicate that Alloy 800H was capable of maintaining high strength up to 600°C followed by its reduction in yield strength and ultimate tensile strength beyond this temperature. Further, the ductility was reduced at some critical temperatures, possibly due to the dynamic strain aging effect. Alloy 800H did not exhibit cracking in acidic aqueous solutions, both under constant-load and self-loaded conditions. Slight reductions in the true failure stress, percent …
Vocabulary Acquisition And The Generation Effect, Barbara Anne Badgett
Vocabulary Acquisition And The Generation Effect, Barbara Anne Badgett
UNLV Retrospective Theses & Dissertations
This study investigated two methods of inducing the Generation Effect and how its principles might be incorporated in vocabulary acquisition. Subjects attempted to learn 22 unfamiliar vocabulary words under one of three conditions. (1) definition-only control subjects repeatedly wrote each word and definition; (2) sentence generation subjects wrote each word and definition and then wrote a meaningful sentence using that word; and (3) definition generation subjects read the words embedded in context sentences and extrapolated and wrote the word meanings. Subjects were tested following a distracter task, 48-hours later, and again 21-days later. Significant main effects were found for encoding …
A Comparison Of Thermal Storage Models With A Solar Electric Generation System Using Trnsys, Jade Gaal
A Comparison Of Thermal Storage Models With A Solar Electric Generation System Using Trnsys, Jade Gaal
UNLV Retrospective Theses & Dissertations
Two new component types were developed for the transient simulation program TRNSYS with IISiBat that models three different types of sensible thermal storages for analysis with use in a solar electric generating system (SEGS) simulation. One component containing a fully mixed, stratified and a plug flow tank model has been developed such that the inputs and parameter specifications are similar so that all three models could be easily placed into one component type. A single, cylindrical direct storage tank with one inlet and one outlet that evaluates fluid properties as a function of temperature is representative for all three models. …
An Application Of The Kuleshov Experiment On Generation X: Testing Viewer Reactions To Editing, Giselle Touzard
An Application Of The Kuleshov Experiment On Generation X: Testing Viewer Reactions To Editing, Giselle Touzard
UNLV Retrospective Theses & Dissertations
The Kuleshov Experiment, conducted in Russia in 1919, concluded that audiences find meaning in the juxtaposition of unrelated shots. This discovery was one of the earliest observations used to formulate the theory of montage. This study combines historical information related to the original experiment, editing techniques, and theories in visual literacy. This is a quasi-experiment applied to a new generation of viewers; A video that replicates the original experiment is used as a stimulus, and an instrument observes audience's reactions to editing. The assumption made is that a new generation of viewers will be capable of recognizing the lack of …
Generation X: A Social Movement Toward Cynicism, Paula Gottula Miles
Generation X: A Social Movement Toward Cynicism, Paula Gottula Miles
UNLV Retrospective Theses & Dissertations
In the past twenty-five years Americans have shifted from modern values of reason, science, and progress, to postmodern values of cynicism and relativism. Due to the different social climate and the ubiquitous mass media, Generation Xers--those born between 1960 and 1980--are the first to be socialized from infancy to possess postmodern values. Because of this dramatic shift in values, Generation X can be viewed as an intellectual or cultural social movement, in the sense of a social movement being a collective change in values over time. This study examines the differing values of Generation X by comparing their values to …
Cost Calculation Of Ancillary Services Including System Security, Automatic Generation Control And Reactive Power, Mohammad Shahzad Lateef
Cost Calculation Of Ancillary Services Including System Security, Automatic Generation Control And Reactive Power, Mohammad Shahzad Lateef
UNLV Retrospective Theses & Dissertations
The recent changes in the electric utility industry due to the deregulation of the industry have created an immense need for the evaluation of all the services provided. The electric utility companies all across the United States have been providing these services for a long period of time. However, under the light of current deregulation, each one of these services have to be identified and evaluated separately. This thesis discusses three of these services, including security of the power system operation (Spinning and operating reserves), Automatic Generation Control (Load Following) and reactive power support. These three services are vital in …
Computer Generation And Rendering Of Terrain, Frederick John Haab
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.
On The Design Of A Multiagent User Interface For Next Generation Geographic Information System, Guishen Wang
On The Design Of A Multiagent User Interface For Next Generation Geographic Information System, Guishen Wang
UNLV Retrospective Theses & Dissertations
In this thesis, a multiagent user interface architecture is designed for the Next Generation Geographic Information System(NGGIS) which supports the following advanced features: multiple users, multiple views, direct manipulation, distribution, and intelligence. In this architecture, agent is a basic functional unit. Agents cooperate with each other by exchanging messages. The User is just a special agent who communicates with any other agents. The ShowCase and its cooperative agents are specialized to present the geographic objects in different views. The WorkShop and its cooperative agents provide a complete interface to allow the user to manipulate the GIS objects directly. The Monitor …
The Origin Of The Wilson Ridge Pluton And Its Enclaves, Northwestern Arizona: Implications For The Generation Of A Calc-Alkaline Intermediate Pluton In An Extensional Environment, Lance Louis Larsen
The Origin Of The Wilson Ridge Pluton And Its Enclaves, Northwestern Arizona: Implications For The Generation Of A Calc-Alkaline Intermediate Pluton In An Extensional Environment, Lance Louis Larsen
UNLV Retrospective Theses & Dissertations
The Wilson Ridge pluton is an epizonal calc-alkaline pluton that formed about 13.5 Ma during a period of mid-Miocene extension. The pluton was passively emplaced into a 1.7 to 1.8 Ga Precambrian crystalline terrain. High-angle normal faulting resulted in a series of horsts and grabens that provide windows into deep structural levels of the pluton; The Wilson Ridge pluton is composed of the Teakettle Pass suite, comprised of foliated monzodiorite and quartz monzodiorite, and unfoliated quartz monzonite; and the older Horsethief Canyon diorite; Intermediate rocks of the Teakettle Pass suite contain abundant basalt and diorite enclaves; Field evidence and major …