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Development of a Procedure to Evaluate Groundwater Quality and Potential Sources of Contamination in the East Texas Basin

Description: This study contributes a procedure, based on data analysis and geostatistical methods, to evaluate the distribution of chemical ratios and differentiate natural and anthropogenic contaminant sources of groundwater quality in the East Texas Basin. Four aquifers were studied, Sparta, Queen City, Carrizo and Wilcox. In this study, Carrizo- Wilcox is considered as one aquifer, and Sparta-Queen City as another. These aquifers were divided into depth categories, 0-150 feet for Sparta-Queen City and 3… more
Date: May 2001
Creator: Alderman, John H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Phosphorus Retention and Fractionation in Masonry Sand and Light Weight Expanded Shale Used as Substrate in a Subsurface Flow Wetland

Description: Constructed wetlands are considered an inefficient technology for long-term phosphorus (P) removal. The P retention effectiveness of subsurface wetlands can be improved by using appropriate substrates. The objectives of this study were to: (i) use sorption isotherms to estimate the P sorption capacity of the two materials, masonry sand and light weight expanded shale; (ii) describe dissolved P removal in small (2.7 m3) subsurface flow wetlands; (iii) quantify the forms of P retained by the sub… more
Date: August 2002
Creator: Forbes, Margaret G.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Development, Validation, and Evaluation of a Continuous, Real-time, Bivalve Biomonitoring System

Description: A biological monitoring tool to assess water quality using bivalve gape behavior was developed and demonstrated. The purpose of this work was to develop methodologies for screening water quality appropriate to the goals of the watershed paradigm. A model of bivalve gape behavior based on prediction of behavior using autoregressive techniques was the foundation of the bivalve biomonitoring system. Current technology was used in developing the system to provide bivalve gape state data in a contin… more
Date: December 2002
Creator: Allen, H. Joel
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Removal of selected water disinfection byproducts, and MTBE in batch and continuous flow systems using alternative sorbents.

Description: A study was conducted to evaluate the sorption characteristics of six disinfection byproducts (DBPs) on four sorbents. To investigate sorption of volatile organic compounds (VOCs), specially designed experimental batch and continuous flow modules were developed. The investigated compounds included: chloroform, 1,2-dichloroethane (DCE), trichloroethylene (TCE), bromodichloromethane (BDCM), methyl tertiary butyl ether (MTBE), bromate and bromide ions. Sorbents used included light weight aggregate… more
Date: December 2002
Creator: Kadry, Ahmed Y.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Macroinvertebrate Community Structure as an Indicator of Watershed Health in the Upper Trinity River Basin, North Central Texas

Description: This study describes macroinvertebrate community structure and assesses its potential in detecting point and non-point sources of disturbance associated with rural and urban areas in the Upper Trinity River Basin. Geospatial techniques were used to quantify landuse within the watershed in a GIS. At rural sites near the headwaters of the Trinity River, collector-gathering burrowers that are adapted to minimal flow comprised the majority of taxa. Destinies of taxa compositions at downstream sites… more
Date: May 2000
Creator: Stephenson, Jaynie M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Habitat '67

Description: The raking view of a portion of the exterior facade is seen behind some landscaping and a water feature.
Date: 1967
Creator: Safdie, Moshe
Item Type: Refine your search to only Image
Partner: UNT College of Visual Arts + Design

Bio-Inspired Material Surfaces with Self-cleaning, Micromanipulation and Water Collection

Description: Geckos are famous for the skill of switchable adhesion that they use to stick on various surface while keep their fingers super clean. In the dissertation, a unique mechanism was discovered to explain gecko self-cleaning phenomena. Using atomic force microscopy (AFM), we managed to compare the microparticle-substrate adhesion and the microparticle-seta adhesion with a single seta bonded to the AFM cantilever. A dynamic effect was approved that high pulling-off speed could increase the micropart… more
Date: May 2019
Creator: Wan, Yiyang
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Distribution and Probable Sources of Nitrate in the Seymour Aquifer, North Central Texas, USA

Description: This study utilized GIS and statistical methods to map the spatial variability of nitrate and related groundwater constituents in 30 counties above the Seymour Aquifer, analyze temporal patterns of nitrate pollution, identify probable sources of pollution, and recommend water development strategies to minimize exposure to nitrate and reduce future aquifer contamination. Nitrate concentrations in excess of 44 mg/L (US EPA limit) were commonly observed in the Seymour Aquifer region, especially i… more
Date: May 2001
Creator: Hillin, Clifford K.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Water systems, water policy, and Karst terrain: An analysis of the complex relationships between geology, economy, public perceptions, and policy in southern Trelawny, Jamaica.

Description: Jamaica has an abundance of freshwater resources, however, a lack of infrastructure makes treated, piped water inaccessible in many areas. Through literature reviews and site visits, this thesis is an analysis of how the people and land, and money and policy, interact with one another in relation to Jamaica's freshwater resources and water infrastructure. Special attention is given to the island's type-example Cockpit karst geology; tourism, mining, and farming's relation to this karst; types o… more
Date: December 2005
Creator: McCall, Sarah
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Characterization of Iron Oxide Deposits Formed at Comanche Peak Steam Electric Station

Description: The presence of deposits leading to corrosion of the steam generator (SG) systems is a major contributor to operation and maintenance cost of pressurized water reactor (PWR) plants. Formation and transport of corrosion products formed due to the presence of impurities, metallic oxides and cations in the secondary side of the SG units result in formation of deposits. This research deals with the characterization of deposit samples collected from the two SG units (unit 1 and unit 2) at Comanche P… more
Date: May 2003
Creator: Namduri, Haritha
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Application of Cultured Neuronal Networks for Use as Biological Sensors in Water Toxicology and Lipid Signaling.

Description: This dissertation research explored the capabilities of neuronal networks grown on substrate integrated microelectrode arrays in vitro to be applied to toxicological research and lipid signaling. Chapter 1 details the effects of chlorine on neuronal network spontaneous electrical activity and pharmacological sensitivity. This study demonstrates that neuronal networks can maintain baseline spontaneous activity, and respond normally to pharmacological manipulations in the present of three times… more
Date: August 2004
Creator: Dian, Emese Emöke
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Evaluation of City of Denton Sub-Watershed by Benthic Macroinvertebrate Field Experimental Approach

Description: In this study, two different field experiments were designed to assess the relative influence of urbanization on benthic communities. During spring and summer, four urban and one reference sites from Denton County, Texas were selected for benthic macroinvertebrate evaluation. Statistically significant differences in colonized benthic macroinvertebrate taxa on artificial substrates were observed among the four urban sites and the reference site. Oligochaetes and chironomids were the dominant t… more
Date: August 2006
Creator: Mahato, Mahendra
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Mensa Seecunda

Description: Recording of Roderik De Man's Mensa Seecunda. This work is a multimedia project realized by Jorge Isaac, a recorder player, and a performer. This piece involves dance, video projection, and live electronics. The subject is the life of the ambitious Roman masterchef, Apicius, who sacrifices everything to find the perfect recipe.
Date: 2004
Duration: 12 minutes 46 seconds
Creator: Man, Roderik de 1941-
Item Type: Refine your search to only Sound
Partner: UNT Music Library

Stilleben in Cracow

Description: Recording of Agnieszka Waligórska and Pekka Siren's Stilleben in Cracow. This composition was inspired by the city of Cracow which has been badly polluted by Nove Huta steel, however the inhabitants are dreaming of wind and birdsong. This work contains the sounds of birds, water, and the flute.
Date: 2004
Duration: 6 minutes 19 seconds
Creator: Siren, Pekka & Waligórska, Agnieszka
Item Type: Refine your search to only Sound
Partner: UNT Music Library

Amarcord - Dreams (les rêves)

Description: Recording of Bor Turel's Amarcord - Dreams (les rêves). This piece is the second movement of the work "Amarcord" that the composer describes as a trilogy of sonorous memories. This work was conceived as a combination of electronic, electroacoustic, and ambient instrumental recordings that were all produced in the years from 1976 to 1996.
Date: 1996/1997
Duration: 10 minutes 18 seconds
Creator: Turel, Bor
Item Type: Refine your search to only Sound
Partner: UNT Music Library

Eau de la prophétie

Description: Recording of Tomonari Higaki's Eau de la prophétie. This is an electroacoustic work for amplified piano. This piece was inspired by the infinite variations and meanings that water has in our lives and on Earth. The instrumental and electroacoustic parts combine to express the forms and transition between the forms of water: solid, liquid, and gas.
Date: 2003
Duration: 11 minutes 20 seconds
Creator: Higaki, Tomonari
Item Type: Refine your search to only Sound
Partner: UNT Music Library
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