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8,328 Matching Results
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Field Validation of Zero Energy Lab Water-to-Water Ground Coupled Heat Pump Model
Heat pumps are a vital part of each building for their role in keeping the space conditioned for the occupant. This study focuses on developing a model for the ground-source heat pump at the Zero Energy lab at the University of North Texas, and finding the minimum data required for generating the model. The literature includes many models with different approaches to determine the performance of the heat pump. Each method has its pros and cons. In this research the equation-fit method was used to generate a model based on the data collected from the field. Two experiments were conducted for the cooling mode: the first one at the beginning of the season and the second one at the peak of the season to cover all the operation conditions. The same procedure was followed for the heating mode. The models generated based on the collected data were validated against the experiment data. The error of the models was within ±10%. The study showed that the error could be reduced by 20% to 42% when using the field data to generate the model instead of the manufacturer’s catalog data. Also it was found that the minimum period to generate the cooling …
Date:
May 2016
Creator:
Abdulameer, Saif
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Ozone Pollution of Shale Gas Activities in North Texas
The effect of shale gas activities on ground-level ozone pollution in the Dallas-Fort Worth area is studied in detail here. Ozone is a highly reactive species with harmful effects on human and environment. Shale gas development, or fracking, involves activities such as hydraulic fracturing, drilling, fluid mixing, and trucks idling that are sources of nitrogen oxides (NOX) and volatile organic compounds (VOC), two of the most important precursors of ozone. In this study two independent approaches have been applied in evaluating the influences on ozone concentrations. In the first approach, the influence of meteorology were removed from ozone time series through the application of Kolmogorov-Zurbenko low-pass filter, logarithmic transformation, and subsequent multi-linear regression. Ozone measurement data were acquired from Texas Commission on Environmental Quality (TCEQ) monitoring stations for 14 years. The comparison between ozone trends in non-shale gas region and shale gas region shows increasing ozone trends at the monitoring stations in close proximity to the Barnett Shale activities. In the second approach, the CAMx photochemical model was used to assess the sensitivity of ozone to the NOX and VOC sources associated with shale oil and gas activities. Brute force method was applied on Barnett Shale and Haynesville Shale emission …
Date:
May 2016
Creator:
Ahmadi, Mahdi
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Education of Women in Texas
Study of the history of women's education in Texas. This work discusses the foundations of education in Texas and the factors that influenced the growth of women's education within the state. The index begins on page 179.
Date:
2018
Creator:
Aiken, Wreathy Price
Object Type:
Book
System:
The Portal to Texas History
The Limits of Arbitrage and Stock Mispricing: Evidence from Decomposing the Market to Book Ratio
The purpose of this paper is to investigate the effect of the "limits of arbitrage" on securities mispricing. Specifically, I investigate the effect of the availability of substitutes and financial constraints on stock mispricing. In addition, this study investigates the difference in the limits of arbitrage, in the sense that it will lead to lower mispricing for these stocks, relative to non-S&P 500 stocks. I also examine if the lower mispricing can be attributed to their lower limits of arbitrage. Modern finance theory and efficient market hypothesis suggest that security prices, at equilibrium, should reflect their fundamental value. If the market price deviates from the intrinsic value, then a risk-free profit opportunity has emerged and arbitrageurs will eliminate mispricing and equilibrium is restored. This arbitrage process is characterized by large number of arbitrageurs which have infinite access to capital. However, a better description of reality is that there are few numbers of arbitrageurs to the extent that they are highly specialized; and they have limited access to capital. Under these condition arbitrage is no more a risk-free activity and can be limited by several factors such as arbitrage risk and transaction costs. Other factors that are discussed in the literature …
Date:
December 2015
Creator:
AlShammasi, Naji Mohammad
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Long-Term Citizen Science Water Monitoring Data: An Exploration of Accuracy over Space and Time
The Texas Stream Team (TST) is one of an increasing number of citizen science water monitoring programs throughout the US which have been continuously collecting surface water quality data under quality assurance protocols for decades. Volunteer monitoring efforts have generated monitoring datasets that are long-term, continuous, and cover a large geographic area - characteristics shown to be valuable for scientists and professional agencies. However, citizen science data has been of limited use to researchers due to concerns about the accuracy of data collected by volunteers, and the decades of water quality monitoring data collected by TST volunteers is not widely used, if at all. A growing body of studies have attempted to address accuracy concerns by comparing volunteer data to professional data, but this has rarely been done with large-scale, existing datasets like those collected by TST. This study assesses the accuracy of the volunteer water quality data collected across the state of Texas by the TST citizen science program between 1992-2017 by comparing it to professional data from corresponding stations during the same time period, as well as comparing existing and experimental data from a local TST partner agency. The results indicate that even large-scale, existing volunteer and professional …
Date:
December 2018
Creator:
Albus, Kelly
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"Miss Kathy"
Miss Kathy is a documentary film that tells the story of Kathy Griffin-Grinan, a lead recovery coach for prostitution and human trafficking with the Harris County Sheriff’s Office. Her non-profit organization —We’ve Been There, Done That – works in conjunction with law-enforcement to offer the survivors of prostitution a chance at rehabilitation. With endless enthusiasm, she mentors survivors as they struggle to escape a destructive lifestyle. This film also explores the relationship between human trafficking and prostitution, while addressing issues of victimization and exploitation.
Date:
May 2015
Creator:
Alexander, Jeffrey, 1982-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Impact of Sociocultural and Information Communication Technology Adoption Factors on the Everyday Life Information Seeking Behavior of Saudi Students in the United States
Access:
Use of this item is restricted to the UNT Community
This study analyzes the sociocultural factors that affect Saudi students in the U.S. as they seek information and explores to what extent these factors impact their everyday life information seeking (ELIS) behavior and their information technology behavior (ITB). The factors in this study illustrate the unique sociocultural values that distinguish Saudi students from other international student groups: gender segregation, emphasis on religion, social support, and utilization of the consultation concept. After collecting data from an online survey, the data from linear regression analyses revealed that only one culture factor (the language barrier) showed a significant impact on Saudi student ELIS in the U.S., while the other factors were not statistically significant. Also, the findings indicated that perceived usefulness (PU) and perceived ease of use (PEU) were statistically significant to the ELIS of Saudi students. Furthermore, the study showed that after academic information, food and drink, entertainment, and health were the top student needs, the top ranking sources for everyday life seeking information were social media and the Internet. The findings of the study help to shed light on a sizable user group. As the fourth largest group of international students in the U.S., Saudi students have been underrepresented in research. …
Date:
May 2019
Creator:
Alkahtani, Latifah M
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Miss Ella of the Deep South of Texas
Historical narrative of the life of Ellen Talbot and the region of Texas the author calls the "Deep South of Texas," meaning that area near the Gulf that combines elements of the West with those of the Deep South.
Date:
2018
Creator:
Allen, Arda Talbot, 1889-
Object Type:
Book
System:
The Portal to Texas History
Photo-induced Toxicity of Deepwater Horizon Spill Oil to Four Native Gulf of Mexico Species
The 2010 Deepwater Horizon oil spill resulted in the accidental release of millions of barrels of crude oil into the Gulf of Mexico (GoM). Photo-induced toxicity following co-exposure to ultraviolet (UV) radiation is one mechanism by which polycyclic aromatic hydrocarbons (PAHs) from oil spills may exert toxicity. Blue crab (Callinectes sapidus) are an important commercial and ecological resource in the Gulf of Mexico and their largely transparent larvae may make them sensitive to PAH photo-induced toxicity. Mahi-mahi (Coryphaena hippurus), an important fishery resource, have positively buoyant, transparent eggs. These characteristics may result in mahi-mahi embryos being at particular risk from photo-induced toxicity. Red drum (Sciaenops ocellatus) and speckled seatrout (Cynoscion nebulosus) are both important fishery resources in the GoM. They spawn near-shore and produce positively buoyant embryos that hatch into larvae in about 24 h. The goal of this body of work was to determine whether exposure to UV as natural sunlight enhances the toxicity of crude oil to early lifestage GoM species. Larval and embryonic organisms were exposed to several dilutions of water accommodated fractions (WAF) from several different oils collected in the field under chain of custody during the 2010 spill and two to three gradations of natural …
Date:
December 2015
Creator:
Alloy, Matthew Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"Her Name Was"
Her Name Was is an examination of the oppression of transgender people in a society that is built on the nominalization of cisgender people, those who gender matchers their sex assigned at birth, and how this oppression lends itself to violence. In the summer of 2015, the body of Shade Schuler, an African American transgender woman, was found in a field outside of Dallas, Texas. Ms. Shade is part of an alarming epidemic of escalating levels of targeted violence against the transgender community. This documentary pulls back the curtain as it captures the feelings and struggles of the transgender community as they attempt to navigate and survive in a cis dominating society.
Date:
August 2018
Creator:
Almendariz, Sergio E
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Hexagon, Volume 101, Number 1, Spring 2010
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Spring 2010
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 101, Number 2, Summer 2010
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Summer 2010
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 101, Number 3, Fall 2010
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Autumn 2010
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 101, Number 4, Winter 2010
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Winter 2010
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 102, Number 1, Spring 2011
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Spring 2011
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 102, Number 2, Summer 2011
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Summer 2011
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 102, Number 3, Fall 2011
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Autumn 2011
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 102, Number 4, Winter 2011
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Winter 2011
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 103, Number 1, Spring 2012
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Spring 2012
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 103, Number 2, Summer 2012
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Summer 2012
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 103, Number 3, Fall 2012
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Autumn 2012
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 104, Number 1, Spring 2013
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Spring 2013
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 104, Number 2, Summer 2013
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Summer 2013
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 104, Number 3, Fall 2013
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Autumn 2013
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library