Digital Commons Network^™

Immobilization Of Fission Iodine By Reaction With A Fullerene Containing Carbon Compound And Insoluble Natural Matrix, Spencer M. Steinberg, Gary Cerefice, David W. Emerson

Separations Campaign (TRP)

The stability of the association of iodine with FCC and NOM products were studied. Product distributions for the various matrices under various reaction conditions were examined in order to maximize the binding of iodine. The recovery of the iodine from the sequestration matrices was also examined, along with the conversion of the iodine to matrices more suitable for geological storage and/or use as transmutation targets.

The following are the specific research objectives and goals:

• Develop bench-scale experimental set-up and procedures for simulating plutonium extraction process (PUREX) head-end vapor phase.
• Develop experimental procedures for evaluating iodine sequestering methods using bench-scale procedures. …

Evaluation Of Cs/Sr Waste Form For Long Term Storage And Disposal, Gary Cerefice, Longzhou Ma

Waste Forms Campaign (TRP)

The goal of this project is to examine two potential concerns regarding the long-term performance of a proposed cesium/ strontium waste form. To facilitate long-term storage, up to 300 years, the disposal containers will need to be able to survive for the entire storage interval. The first aspect of the project will explore the potential interaction of the aluminosilicate waste form with the storage canister materials to determine if there is any corrosion or chemical interaction concerns for the storage of the materials.

At the end of the storage interval, most of the 137Cs in the waste form will have …

Geochemical And Transport Modeling Of Selected Radionuclides At Yucca Mountain, Yuyu Lin

UNLV Retrospective Theses & Dissertations

Yucca Mountain, Nevada has been selected as a potential high-level nuclear waste repository. The groundwater system at Yucca Mountain is a primary medium through which radionuclides might move away from the potential repository. Characterization studies have identified 237Np, 235 U and 239Pu as radionuclides of concern. In this study, simulations of solid solubility, solution speciation, and transport of selected radionuclides are conducted with PHREEQC, a geochemical modeling system. Results from solubility and speciation simulations indicate the influence of pH value and CO2 fugacity on radionuclide dissolution and aqueous species in solution. Kinetic transport simulations produced radionuclide breakthrough curves under various …

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 …

Evaluating The Benefits Of A Systems Approach To Particulate Matter Air Pollution Management, Stephanie Janene Fincher

UNLV Retrospective Theses & Dissertations

Although air quality has improved in the United States over the past thirty years, some air quality management areas continue to have serious problems with air pollutants such as particulate matter (NRC 2004). I hypothesize that using a systems approach would have benefits for PM10 management, including improved results and understanding, as well as identification of ineffective policies. A system dynamics model was developed for PM10 in the Las Vegas Valley. Policy analysis revealed real-world behavior, important dynamics of the system, and potentially harmful policies. Results support the importance of a systems and long-term perspective, and show that PM10 pollution …

On The Use Of Lognormal Distribution For Environmental Data Analysis, Devarshi Pant

UNLV Retrospective Theses & Dissertations

Contaminant concentration data from Superfund sites is quite often positively skewed, and the log-normal theory based statistical procedures are typically used for such data. Recent work in the environmental statistics literature, however, has shown that the use of log-normal theory based formulas, such as the H-statistic confidence interval, is problematic. The performance of the H -- UCL in the presence of non -- detects in the sample is investigated via simulated examples. When comparing mean contaminant concentration at a site with that of the background, the 2-sample t-test on log-transformed data is commonly used. A part of this thesis deals …

Second-Home Owner Attachment To A Destination: A Driver Of Tourism Promotion, John Brumby Mcleod

UNLV Retrospective Theses & Dissertations

Second-homes have become common place in many destinations. The visitation to these homes has become known as second-home tourism. Previous literature suggests that these homeowners might possess traits that would be attractive to tourism planners such as repeat visitation, word-of-mouth promotion, and the hosting of other visitors; The purpose of this study was to explore the presence of these traits in the context of international second-home owners and test a theoretical model that proposes place attachment as a driver of these behaviors. Attachment has been shown as a predictor of visitation and positive word-of-mouth in previous research. Borrowing from the …

Precipitation Monitoring At Yucca Mountain, Klaus J. Stetzenbach, Amanda Brandt

Publications (YM)

Objectives:

Status of the Task to Date
Network Overview/ Equipment
Data Trends
Uses and Collaborative Projects
Spatial Interpolation of YM Rainfall
Storm Event Analysis
Shallow Groundwater Response to Rainfall
UE29a1 Water Level Response to Barometric Pressure Fluctuation

Impact Of The Synthesis Process On Structure Properties For Afci Fuel Candidates, Kenneth Czerwinski

Fuels Campaign (TRP)

Synthesis of actinium mononitrides using carbothermic reduction of the corresponding oxides has a few outstanding issues, including the formation of secondary phases such as oxides and carbides and low densities of the final product. Furthermore the requirement of a high process temperature at 1700°C, for more than 12 hours is also a drawback particularly for Americium-bearing samples. Therefore, it is important to explore the use of other possible routes to synthesize actinide mononitrides.

A low temperature process is used in this research to produce actinide mononitrides using a fluoride route in which the first step is to mix the actinide …

Solution-Based Synthesis Of Nitride Fuels, Tyler A. Sullens, Kenneth Czerwinski

Fuels Campaign (TRP)

The preliminary studies into the synthesis of actinide nitride fuels through a low temperature, liquid ammonia based synthesis route have been conducted on the uranium containing system, and there is good indication for the success of synthesizing uranium (III) nitride. The dissolution of iodine in ammonia is a rapid process, resulting in a pale green solution, which does not result in any observable oxidation of iodine. The cannula transfer of dissolved iodine into the reaction vessel containing U metal has been conducted with little to no residual iodine remaining in the original flask. The metal being used for these reactions …

Piscivory By Non-Native Blue Tilapia (Oreochromis Aureus ) In Clark County, Nevada, Shawn C Goodchild

UNLV Retrospective Theses & Dissertations

Fish communities that share an evolutionary history typically have mechanisms to offset impacts presented by other species. Fish, especially non-game species, which are intermingled with non-native species for which they lack a shared history, are often poorly adapted to offset these impacts. Non-native fish affect native fish through predation, competition, displacement, and disease, affects which are often synergistic. Native fish within the Muddy River system (Clark County, Nevada) experienced a precipitous decline in numbers following an illegal introduction of blue tilapia (Oreochromis aureus) during the 1990's. The purpose of this investigation was to determine if tilapia were directly predating upon …

Thermal Control For The Liquid Metal Coolant Circulation Loop, Xiuju Tan

UNLV Retrospective Theses & Dissertations

The target complex facility (TC-1 facility) located at University of Nevada, Las Vegas (UNLV), is serving the fundamental research of thermal-hydraulics and corrosion test of liquid metal coolant lead bismuth eutectic (LBE). A stable thermal condition is the basis for the TC-1 facility to operate and target coolant LBE to circulate throughout the loop made of the main components of TC-1 facility, TC-1 loop. The proper thermal process of the TC-1 loop critically comprises a smooth heating phase, the main intention of which is to warm all the loop components and melt solid LBE; a stable temperature maintenance phase, which …

2007-2008 Southern Illinois University Bulletin Carbondale Campus (Undergraduate Catalog), Southern Illinois University Carbondale

SIU Bulletins and Course Catalogs Archives

No abstract provided.

Components, Volume 3 (2007), Lsu Center For Computation & Technology

Components

No abstract provided.

Undergraduate Catalog, 2007-2008, Valparaiso University

Undergraduate Catalogs

No abstract provided.

Indigenous Land Tenure Insecurity Fosters Illegal Logging In Nicaragua, Mary Finley-Brook

Geography and the Environment Faculty Publications

Titling of Indigenous common-property lands in easternNicaraguais a necessary base for forest management. Titling alone will not be sufficient to assure sustainable practices, and the success of demarcation programmes rests on processes of negotiation leading up to tenure decisions; nevertheless, a review of decades of history in Indigenous territories suggests that key problems in forest resource administration are inextricably linked to tenure insecurities, as explorations of current resource disputes in seven villages demonstrate. Analysis also suggests that ineffective implementation ofNicaragua’s multiethnic autonomy fosters illegality and resource mismanagement. Fundamental structural changes to improve inclusion, accountability and transparency are necessary. Remediation also …

Preparing For The Day After Tomorrow: Frameworks For Climate Change Adaptation, Ira R. Feldman, Joshua H. Kahan

Sustainable Development Law & Policy

No abstract provided.

Florida Institute Of Technology Catalog 2008-2009, Florida Institute Of Technology

Florida Institute of Technology Melbourne and Jensen Beach Catalogs, 1967-2015

Academic catalog by Florida Institute of Technology for the 2008-2009 academic year.

Obtaining More Accurate And Reliable Information From Adolescents Regarding Sti/Hiv Risk Behaviors, Barbara Mensch, Paul C. Hewett

Poverty, Gender, and Youth

To investigate the quality of self-reported data on sexual behavior, Population Council researchers conducted a study in a rural district of Malawi. They implemented a randomized experiment to assess whether audio computer-assisted self-interviewing (ACASI) produces more valid data on sexual behavior than face-to-face interviews. The Malawi study builds on an experiment conducted as part of a household-based survey of Kenyan adolescents. In Kenya and Malawi, there is clear evidence that mode of interviewing and probing of various sexual partnerships affect the reporting of sexual activity. According to Promoting Healthy, Safe, and Productive Transitions to Adulthood Brief No. 25, ACASI is …

The Communicator, Volume 3, Issue 1, February 2007

The Communicator: News from the Nebraska Cooperative Fish and Wildlife Research Unit

Teaching and Training New Faces (Chris Kelly; Justin Williams; Christopher Lewis; Dustin Martin) Congratulations! (Donald Wardwell; Christopher Lewis; Aaron Lotz) The Changing Faces of USGS Current Research Amphibian Monitoring Techniques (in Relation to Wetland Qualities and the Surrounding Landscape – Rainwater Basin Region) Cross-Scale Structure in Ecosystems An Adaptive Management Approach for Selecting Habitat Improvement Targets in the Shortgrass Prairie Ecosystem Diversity and Ecological Functions Impact of White Perch on Walleye; and Predators of White Perch at Branched Oak and Pawnee Reservoirs Evaluation of Landowner Incentives Program (LIP) for Species at Risk Monitoring, Mapping and Risk Assessment for Non-Indigenous Invasive …

Preconcentration Of Trace Elements On Amberlite Xad-4 Resin Functionalised With 1,2-Bis (O-Aminophenylthio) Ethane And Their Determination By Faas In Environmental Samples, Ömer Dalman, Volkan Numan Bulut, İsmai̇l Deği̇rmenci̇oğlu, Mehmet Tüfekçi̇

Turkish Journal of Chemistry

The use of chemically modified XAD-4-1,2-bis (o-aminophenylthio) ethane chelating resin for preconcentrating Cr^{6+}, Mn^{2+}, Fe^{3+}, Co^{2+}, Cu^{2+}, Cd^{2+}, Zn^{2+}, Pb^{2+}, and Ni^{2+} was studied using flame atomic absorption spectrometry (FAAS) for metal monitoring in environmental samples. Cd^{2+}, Zn^{2+}, Pb^{2+}, and Ni^{2+} ions were quantitatively recovered at the rate of 96.0%, 101.0%, 101.0%, and 95.0%, respectively (RSD < 5%), from the studied solutions. The procedure is based on the retention of analytes on a short column of 1,2-bis (o-aminophenylthio) ethane-XAD-4 chelating resin from a buffered sample solution and subsequent elution with 1 M HNO_3. Various parameters, such as pH, eluent type, and concentration, flow rate of sample solution and matrix interference effect on the retention of the metal ions have been studied. The optimum pH for the sorption of the above-mentioned metal ions was about 6. The adsorption and batch capacity of adsorbent and loading half time (t_{1/2}) for Ni^{2+}, Zn^{2+}, Cd^{2+}, and Pb^{2+} were established. The limit of detection was 3.0 \mu g L^{-1} for Pb^{2+} and Ni^{2+}, 0.6 \mu g L^{-1} for Cd^{2+}, and 0.3 \mu g L^{-1} for Zn^{2+}. The validation of the procedure was carried out by analysis of certified reference materials and standard addition. The proposed enrichment method was applied to environmental samples from Trabzon.

Management In The Gulf And Caribbean: Mosaic Or Melting Pot?, Patrick Mcconney, Hazel A. Oxenford, Milton Haughton

Gulf and Caribbean Research

Does ''managing large pelagic fishes" mean the same thing across the diversity of maritime jurisdictions, governance arrangements, economies, languages, cultures, scales of operation and other features of the Gulf and Caribbean region? It would be surprising if it did. Yet international fisheries management urges this mosaic of management to become a melting pot; at least integrated, even if differentiated. This paper examines some themes underlying whether a mosaic or melting pot is the most apt metaphor for where we are, and are headed, in attempts to manage large pelagic fishes in the region. We pay particular attention to the multi-dimensional …

Canada-Usa Bilateral Fisheries Management In The Gulf Of Maine: Under The Radar Screen, David Vanderzwaag, Emily J. Pudden

Articles, Book Chapters, & Popular Press

Canada and the USA have developed a series of cooperative initiatives that address transboundary fisheries issues in the Gulf of Maine. The Canada – USA Steering Committee serves as an umbrella forum for discussing and coordinating transboundary management measures. Through the work of the Transboundary Resource Assessment Committee and the Transboundary Management Guidance Committee, the Steering Committee has overseen the development of joint scientific stock assessments and a sharing agreement for groundfish resources in the vicinity of the eastern Georges Bank. The bilateral Fisheries Enforcement Agreement helps ensure the success of such cooperative management initiatives by combating illegal fishing in …

Public Opinion, The Leopold Report, And The Reform Of Federal Predator Control Policy, James W. Feldman

Human–Wildlife Interactions

This paper explores the role of public opinion in a landmark shift in the federal predator control pro^gram. In 1963, the Le^opold Committee recommended extensive reform in the federal predator c_ontrol program, predicting that growing p_ublic support for the environmen_tal movement would force such a move if the government did not initiate a change. In the years following the publication of the Leopold Report, the U.S. Division of Wildlife Services reformed its predator control program and tried to improve its public image. Meanwhile, both environmentali_sts and ranchers fought …

Adaptive And Economic Management Methods For Feral Hog Control In Florida, Richard M. Engeman, Bernice U. Constantin, Stephanie A. Schwiff, Henry T. Smith, John Woolard, John Allen, John Dunlap

Human–Wildlife Interactions

Feral hogs (Sus scrofa) negatively impact the environment in most places around the world where they have been introduced into the wild. In many places, hog removal is essential to protect special habitats, in particular, wetlands. This paper describes techniques developed for use in adaptive management approaches to enhance hog removal efforts in Florida, as well as methods to evaluate the economic impacts from hog management. A valuable adaptive management tool that can be an easily applied index to monitor feral hog activity is track plots. This method has been effective for monitoring hog distribution and relative abundance, …

An Extraordinary Patch Of Feral Hog Damage In Florida Before And After Initiating Hog Removal, Richard M. Engeman, John Woolard, Henry T. Smith, Jean Bourassa, Bernice U. Constantin, Daniel Griffin

Human–Wildlife Interactions

Feral hogs (Sus scrofa) are a particularly destructive exotic species in the United States (U.S. Department of Agriculture 1999), including Florida, which, along with Hawaii, is one of 2 states cited as having the most severe invasive species problems (U.S. Congress 1993) in the country. First introduced to North America by the European colonists (Conover 2007) hogs were one of the first invasive exotic species to take hold in Florida. They can transmit disease to livestock (Hartin et al. 2007) and humans (Conover and Vail 2007). They impose a variety of negative environmental impacts, including habitat degradation and …

The Case For A More Rigorous Approach To Teaching Spreadsheet And Database Applications, M. Pamela Neely, Thoms Pray

Articles

Although most schools offer and/or require a course in spreadsheet and database applications, the amount of meaningful learning derived from the class varies widely, due in part to a lack of rigor in adjunct instructor led classes. The approach described in this paper involves a combination of demonstration and hands-on practice using two term-long cases to be used in an introductory course in spreadsheet and database applications. These cases, packaged together with slides emphasizing theory, hands-on quizzes and exams that foster critical thinking, can be used across the multiple sections that are taught to maintain consistency within the course and …

Contents, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Letter From The Dean, Gregory J. Weidemann

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Instructions For Authors, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.