Environmental Sciences Commons^™

Evaluating Actinide Sorption To Graphite With Regards To Triso Repository Performance, Corey Christopher Keith

UNLV Theses, Dissertations, Professional Papers, and Capstones

Graphite has the potential for inclusion in nuclear waste for disposal in waste repository settings. Implementation of High Temperature Gas-cooled Reactors contributes to this potential through use of TRISO fuel, if direct disposal of the graphite matrix surrounding the fuel is employed. The inclusion of the large mass and volume in the TRISO fuel waste form differs significantly from used light water reactor fuel waste forms, requiring new performance models to describe the behavior in a repository setting. The purpose of this study is to evaluate the potential for the graphite to improve actinide, specifically uranium and neptunium, retardation from …

Effects Of Moisture Augmentation Of Municipal Solid Waste Through Addition Of Food Waste Or Wastewater Treatment Biosolids On Bio-Gas Formation For Power Generation, Jared Michael Gore

UNLV Theses, Dissertations, Professional Papers, and Capstones

An investigation into the effect of moisture augmentation by manipulation of food waste proportion or wastewater treatment plant biosolids proportion was undertaken to determine the effects on production of methane and other biogases from municipal solid waste (MSW). Laboratory microcosm experiments were performed to determine the effect of various proportions of influent waste streams on the production of biogas. Results indicated that moisture augmentation through the addition of food waste to MSW increases the overall bio-gas and hydrogen gas formed during fermentation. Moisture augmentation through addition of wastewater treatment bio-solids lead to inconclusive results. Addition of food waste to MSW …

Impact Of Secondary Treatment Types And Sludge Handling Processes On Estrogen Concentration In Wastewater Sludge, Erica J. Marti

UNLV Theses, Dissertations, Professional Papers, and Capstones

Endocrine-disrupting compounds (EDCs), such as estrogen, are known to be present in the aquatic environment at concentrations that negatively affect fish and other wildlife. Wastewater treatment plants (WWTPs) are major contributors of EDCs into the environment. EDCs are released via effluent discharge and land application of biosolids. Estrogen removal in WWTPs has been studied in the aqueous phase; however, few researchers have determined estrogen concentration in sludge. This study focuses on estrogen concentration in wastewater sludge as a result of secondary treatment types and sludge handling processes. Grab samples were collected before and after multiple treatment steps at two WWTPs …

Special Edition: National Clean Energy Summit, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

Young Professionals in Energy–Nevada recently gathered for an up-to-the-day report on renewable energy at UNLV’s LEED-certified Science and Engineering Building given by Associate Vice President for Interdisciplinary Research Tom Piechota—just hours after President Obama appeared on campus in support of higher education.

Piechota, who also heads UNLV’s Urban Sustainability Initiative (and is this author’s boss in that capacity), covered all the overlapping curriculum and research going on. Of about 400 total research projects university-wide, 142 involve clean energy, water or environmental science – some at the nexus of all three. Department of Energy remains the biggest source of funding, along …

Take Pride In America Phase Iii: Quarterly Progress Report, Period Covering April 25, 2012-July 24, 2012, Margaret N. Rees

Anti-littering Programs

• The GIS database continued to be populated with data.
• Hector’s Helpers added an additional youth group.
• The new website launched and social media efforts began.
• The pilot testing of the litter monitoring program continued.

The University of Nevada Las Vegas Public Lands Institute (PLI) designed the Take Pride in America (TPIA) Phase III work plan based on the strategic plan developed by the Southern Nevada Agency Partnership (SNAP) anti-litter and desert dumping team during Phase II of the program.

Walking Box Ranch Planning And Design Quarterly Progress Report: Period Ending July 10, 2012, Margaret N. Rees

Walking Box Ranch

• BLM informed UNLV that after investigating a concession contract as the appropriate BLM document for the future operating partner, they have concluded that an operating agreement is the preferred document and they are proceeding to complete such an agreement as soon as possible.
• Following a visit to the ranch with BLM, UNLV has completed temporary repairs to ranch house windows, which should mitigate deterioration of the ranch house from water
• UNLV participated in a one-half day meeting with BLM to review Condit’s Extended Content Package #1. As a result of the lack of progress by Condit, UNLV was requested to …

Hrc Enews — 2012 Summer, Megan M. Iudice

Publications (HRC)

This issue contains staff accomplishments and announcements, event listings, and a "new faces" listing for new staff, affiliates, and researchers.

Nevada Interagency Volunteer Program: Helping Hands Across Public Lands: Phase Ii: Period Covering April 1, 2012 To June 30, 2012, Margaret N. Rees

Get Outdoors Nevada

• The number of records in the volunteer database increased by 14.4% over the last quarter. The database now contains 8,087 records.
• Results show an average of 956 visits per month, and an average of 3,015 pages viewed per month.
• Get Outdoors Nevada supplied 11 volunteer events in a variety of ways. These events utilized 388 volunteers who contributed approximately 1,351 hours of service.
• The team continues planning an alternative bus tour.
• The team is negotiating a media plan, to be rolled out in July.
• The IVP team has stated planning for the annual volunteer recognition banquet.
• One volunteer training was …

Estimating Annual Precipitation For The Colorado River Basin Using Oceanic-Atmospheric Oscillations, Ajay Kalra, Sajjad Ahmad

Civil and Environmental Engineering and Construction Faculty Research

Estimating long-lead time precipitation under the stress of increased climatic variability is a challenging task in the field of hydrology. A modified Support Vector Machine (SVM) based framework is proposed to estimate annual precipitation using oceanic-atmospheric oscillations. Oceanic-atmospheric oscillations, consisting of Pacific Decadal Oscillation (PDO), North Atlantic Oscillation (NAO), Atlantic Multidecadal Oscillation (AMO), and El Niño–Southern Oscillation (ENSO) for a period of 1900–2008, are used to generate annual precipitation estimates with a 1 year lead time. The SVM model is applied to 17 climate divisions encompassing the Colorado River Basin in the western United States. The overall results revealed that …

Let Us Buy You Coffee!, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

NIREC is a nonprofit organization that helps Nevada's entrepreneurs to build their businesses. We'd like to better understand the biggest challenges that currently face entrepreneurs, so that we can work on fixing them more effectively.

Pv Costs Overestimated - High-Impact Innovation, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

Current accounting methods often over-estimate the lifetime costs of generating electricity from solar panels, according to “Reconsidering the Economics of Photovoltaic Power.” This new working paper, written by 10 authors with insight into the economics of solar power, appeared on the website Bloomberg New Energy Finance (BNEF).

Nevada Grown, Cutting Edge Clean Energy Innovation Please, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

The Nevada chapter of Young Professionals in Energy (YPE Nevada) seeks to facilitate the advancement of mid-career energy professionals in the state of Nevada through social, educational, vocational and community service events. YPE Nevada aims to build a cohesive network of energy professionals from students to retired executives, and to create an environment where members can learn from each other’s experiences, share industry knowledge and discuss career matters. By expanding networking between the state’s energy professionals, it aims to enhance entrepreneurial activity.

Unlv Students To Build Zero Net Energy Home; Boom & Bust Report, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

Design and build an approximately 800 square foot home that consumes zero net energy.

Those are the instructions for Team Las Vegas, after the University of Nevada, Las Vegas (UNLV) became one of only 20 schools worldwide to quality for the 2013 Solar Decathlon, sponsored by the U.S. Department of Energy’s National Renewable Energy Laboratory.

UNLV’s entry, Autonomy House, is marketed as an “age-in-place” home for an empty nester whose children have grown up. The 730-squarefoot home will use daylighting from windows, insulation and solar panels to produce more energy than it consumes. Additionally, it will filter rainwater for household …

Join Nevada's Newly Formed Networking Group For All Energy Professionals, Nevada Institute For Renewable Energy Commercialization (Nirec)

Nevada Newsflash

“YPE Nevada is designed to engage Nevada’s mid-career energy professionals through a variety of career-related, community service, professional education and social events to be scheduled across the entire state. ” said YPE Nevada Board Member Walt Borland, the President and CEO of NIREC that is sponsoring the launch of the new chapter. “And, we expect that this enhanced interaction will help to drive more energy-related entrepreneurial activity in Nevada.”

College Of Engineering Senior Design Competition Spring 2018, University Of Nevada, Las Vegas

Fred and Harriet Cox Senior Design Competition Projects

Part of every UNLV engineering student’s academic experience, the senior design project stimulates engineering innovation and entrepreneurship. Each student in their senior year chooses, plans, designs, and prototypes a product in this required element of the curriculum. A capstone to the student’s educational career, the senior design project encourages the student to use everything learned in the engineering program to create a practical, real world solution to an engineering challenge. The senior design competition helps focus the senior students in increasing the quality and potential for commercial application for their design projects. Judges from local industry evaluate the projects on …

Understanding Urban Sustainability And Quality Of Life: A System Dynamics Approach, Abby Elizabeth Beck

UNLV Theses, Dissertations, Professional Papers, and Capstones

For an urban area to be sustainable, its resources cannot be depleted faster than they can replenish. If an urban area is to provide a high quality of life (QOL), it must offer and maintain an amenity package that satisfies its resident's preferences. Past studies on these topics all have a common thread: sustainability and QOL both pertain to people's relationship to capital. Capital is something that can accumulate and add value to a person or society. If sustainability and QOL are a function of people's relationship with capital, how they use it, deplete it, replenish it and transform it …

Legal Issues In Green Construction, Namrata Shrestha

UNLV Theses, Dissertations, Professional Papers, and Capstones

The most recent "green construction movement", made a significant impact on the design and construction industry in the United States. Organizations such as the American Institute of Architects (AIA) have lobbied governmental entities to provide financial incentives to promote green construction. The green construction community also promotes the notion that a healthier working and living environment is achieved. Due to finical incentives coupled with projected long-term energy cost savings, many owners of new construction are considering green construction as an option. Accompanying the "green construction movement", new kinds of legal issues, particularly relating to green aspects such as certification, energy …

Exploring The Seed Bank Dynamics Of Red Brome: Longevity, Density, And Relationship To Fire, Benjamin S. Jurand

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research explores several untested aspects of the seed bank characteristics of red brome (Bromus rubens), an invasive annual grass in southwestern United States arid lands. Red brome is a formidable competitor to native plant species, both annual and perennial alike, and produces many seeds that germinate easily. The stalks of red brome contribute continuous-cover fuel loads that facilitate wildfires destructive to mature native Mojave Desert plant communities. This makes it a priority species for land managers, particularly when dealing with recovery after fire.

This project addressed questions related to the longevity of red brome seeds in soil seed banks …

The New American Conservation Movement: New Strategies, Focus And Organizations For The 21st Century, Amy Deanna Northrup

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation provides evidence of the emergence of a new conservation movement in the United States. The strategic, tactical and organizational approaches of traditional conservation efforts, which began in the early 1900s, have shifted during the last two decades. Specifically, the new conservation movement is characterized by three distinct changes. First, many of the well-established conservation organizations, such as the Sierra Club and National Audubon Society, have largely abandoned their traditional focus on increasing the number of acres preserved; instead more defensive and fragmented forms of conservation now reign. The second change to the conservation movement involves a dramatic expansion …

Investigating Three Decades Of Vegetation Change In A Mojave Desert Mountain Range, Chris Lee Roberts

UNLV Theses, Dissertations, Professional Papers, and Capstones

This project is a vegetation change study spanning 29 years in the Newberry Mountains of Southern Nevada. Long term monitoring data are crucial for understanding the effects of climate change on vegetation dynamics. Successful management intervention in vegetation change will require identification of early indicator plant species and their responses to climatic cues. This project is one of the oldest comparisons of resurveyed Mojave vegetation community plots with repeatable methodology and the longest survey interval reported for the southeastern Mojave Desert. 103 plots were relocated and resurveyed based on data methods in Jim Holland's thesis titled "A Vegetative Analysis of …

Buffering Pv Output During Cloud Transients With Energy Storage, Yacouba Moumouni

UNLV Theses, Dissertations, Professional Papers, and Capstones

Consideration of the use of the major types of energy storage is attempted in this thesis in order to mitigate the effects of power output transients associated with grid-tied CPV systems due to fast-moving cloud coverage. The approach presented here is to buffer intermittency of CPV output power with an energy storage device (used batteries) purchased cheaply from EV owners or battery leasers. When the CPV is connected to the grid with the proper energy storage, the main goal is to smooth out the intermittent solar power and fluctuant load of the grid with a convenient control strategy. This thesis …

Evaluation Of Highly Efficient Distribution Transformer Design And Energy Standards Based On Load, James Sanguinetti

UNLV Theses, Dissertations, Professional Papers, and Capstones

Power distribution transformers have been prevalent in commercial building distribution systems since the inception of modern commercial electricity. Yet as more and more manufactures seek to improve transformer efficiencies by making changes to the design of the transformer itself, a fundamental concept may be overlooked - the impact transformer demand sizing has on power losses. When modern transformers are improperly sized for the application they will be installed for they are not being utilized at their optimum design loading range, which may impact operating efficiency.

This thesis will aim to test and evaluate modern day transformer design coupled with currently …

Improving Efficiency And Capacity Of Hydro-Turbines In The Western United States, Hoover Dam, Jonathan Sanchez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The goal for this thesis is to minimize clearances and tolerances, in order to prevent water leakage. A proper seal on the seal rings does not let excess water flow through the turbine runner, thus conserving more water and wasting less energy. Moreover, water leakage past worn wear plates allows for an extra load for the turbine when operating in condense mode. When the wicket gates are closed, water leakage past worn plates wastes mechanical energy in the water; thus, decreasing the efficiency of the Francis turbine, especially when operating at partial loads. Furthermore, the wicket gates also known as …

Natural And Constructed Wetlands For Ecosystem And Engineering Services In The Arid And Semi-Arid Regions, Achyut Raj Adhikari

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Las Vegas Wash (LVW) has undergone significant wetlands degradation and soil erosion over the past thirty years due to increasing flow resulting from urbanization and large rainfall events in the Las Vegas Valley Watershed. The increased flow and associated pollution load in the LVW and its adverse impact in Lake Mead have alerted stakeholders to pay a greater attention to explore alternative measures for rehabilitation of wetland ecosystems. This dissertation, using the case of changes in LVW, analyzes and describes ecological and engineering services provided by wetlands in arid and semi-arid regions and provides a knowledge base that can …

Dynamic Modelling Of Single Phase Grid Connected Photovoltaic System, Gopi Krishna Ari

UNLV Theses, Dissertations, Professional Papers, and Capstones

Grid-connected photovoltaic (PV) power systems have been sustaining an exponential growth rate during the past decade. This steep growth is driven by a growing concern about climate change, the adoption of an aggressive regional renewable portfolio standard, rebates and tax incentives, and reduction in PV system cost. One of the main technical barriers that can ultimately limit further PV penetration is the fast variations in the PV system's output power induced by cloud transients. Such events are known to cause voltage fluctuations which may lead to excessive operations of voltage regulation equipment and light flickering.

Solar irradiance variability, which can …

Developing A Simulation Model For Power Demand Control Analysis And Privacy Protection In Smart Grid, Sungchul Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

With the growing awareness of the need for Smart Grid, various countries are taking initiatives for developing Smart Grid. However, there is limited research on utilizing Smart Grid for Power Demand Control compared to the other areas such as Smart Grid communication network or renewable energy integration. Therefore, this study attempts to help the current Outage Management System by creating a Simulator that allows an intuitive power demand control analysis. Electrical usage is simulated by taking various inputs including the number of houses, family size, work and life patterns, electrical devices, time, etc. For accurate estimate of family and life …

Spawning, Veliger Growth And Desiccation Of Dreissena Bugensis, Lynn Schwaebe

UNLV Theses, Dissertations, Professional Papers, and Capstones

Quagga (Dreissena bugensis) mussel veliger growth was compared under two dietary conditions: 1) only seston present in Lake Mead water; and 2) Lake Mead seston plus algae (Isochrysis galbana). Shell length, width, and area were compared as a function of time for the two treatments. It was expected that mussels would exhibit faster growth when supplemented with I. galbana than with Lake Mead water alone. However, no significant difference was observed between the control and I. galbana treatments. This result was unexpected and may have been caused by water quality, the nutritional content of Lake Mead seston, and/or over feeding. …

Measuring Spillover Effects Of Residential Amenity Improvements Using Spatial Hedonic Approach, Shruti Bishan Tandon

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this dissertation is to develop a methodology for the estimation of the appropriate welfare benefits in the presence of spillover externalities. The ability to capture influences of the not so easily observed variables allow spatial lag models to measure the direct and indirect spillover effects. The direct effect measures the value of the property in question and the indirect captures the influences of neighboring properties, through a spatial multiplier effect.

Kim et al. (2003) through a path breaking approach estimated welfare benefits of air quality improvement. Their methodology captured spillover effects of amenity changes that lump both …

Buffering Pv Output During Cloud Transients With Energy Storage, Yacouba Moumouni

College of Engineering: Graduate Celebration Programs

The Problem

• Photovoltaic output power can be affected by many factors including clouds passing overhead.

• Utilities in generally prefer a guaranteed power delivery level over some specified power delivery period.

• Power delivered during peak demand hours is generally more valued by utilities. For the Desert Southwest this is in the summertime afternoons. For the local area this will be defined as 1-5 pm for the three summer months.

• While battery power can be adapted to this problem, large batteries to be expensive.

Solar Cell Design Using Metamaterials, Yang Liu, Yitung Chen, Jichun Li

College of Engineering: Graduate Celebration Programs

Natural structure with simultaneous negative permittivity and permeability has not been discovered yet. However, using specially-designed metal embedded in dielectric bodies can achieve a kind of artificial negative index. This periodic structure which is smaller than the guided wavelength is known as a metamaterial. However, recent designs of metamaterials have some disadvantages when they are used in the application of solar cell. The perfect absorption is only within a narrow band, and for most of the solar spectrum, the absorption is no more than 10%. Here, a new kind of absorber for the solar spectrum has been designed and analyzed, …