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Descriptors for Pentane-2,4-dione and Its Derivatives
This article uses equations for partition coefficients of compounds from water and the gas phase to various solvents to obtain descriptors for pentane-2,4-dione and 21 of its derivatives.
Date:
August 19, 2017
Creator:
Abraham, M. H. (Michael H.) & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Trajectories of Burden and Depression in Caregivers Following Traumatic Injury: The Role of Resilience
As part of an effort to understand psychological consequences among family members of patients sustaining a traumatic injury, medical research has turned to the role of resilience – or the ability to bounce back from and maintain psychological well-being in the wake of an adverse event— in mitigating the potential distress (i.e., depression and burden) of caregiving (Bonanno, 2004; Roberson et al., under review). This study sought to examine the ability for trait-resilience to predict trajectories of distress over the course of a year among 124 family members and loved ones of patients admitted to a Level I Trauma Center. A cross-lagged path model examining resilience, burden, and depression at baseline, 3, 6, and 12 months after injury showed that, while depression strongly predicted later burden, resilience was not a significant predictor of either outcome in the model. When depression and burden were subjected to a person-centered analysis (i.e., latent growth curve analysis), two major classes were identified: caregivers with high, chronic distress (33% of the sample) and low-moderate distress that declined over time. A three-class solution for caregiver burden further identified a moderate, increasing trajectory class. Predictive discriminant analyses revealed that trait-resilience was a major differentiating trait between class …
Date:
August 2017
Creator:
Agtarap, Stephanie D
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Implementing a Testing Protocol for Approving Alternative Supplementary Cementitious Materials (SCMs): Natural Minerals and Reclaimed and Remediated Fly Ashes
Report on implementing a testing protocol for approving alternative supplementary cementitious materials.
Date:
August 2017
Creator:
Al-Shmaisani, Saif; Kalina, Ryan; Rung, Michael; Ferron, Raissa & Juenger, Maria
Object Type:
Report
System:
The Portal to Texas History
A Classification of the Homogeneity of Countable Products of Subsets of Real Numbers
Spaces such as the closed interval [0, 1] do not have the property of being homogeneous, strongly locally homogeneous (SLH) or countable dense homogeneous (CDH), but the Hilbert cube has all three properties. We investigate subsets X of real numbers to determine when their countable product is homogeneous, SLH, or CDH. We give necessary and sufficient conditions for the product to be homogeneous. We also prove that the product is SLH if and only if X is zero-dimensional or an interval. And finally we show that for a Borel subset X of real numbers the product is CDH iff X is a G-delta zero-dimensional set or an interval.
Date:
August 2017
Creator:
Allen, Cristian Gerardo
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Transformative Learning Theory as a Basis for Identifying Barriers to Faculty Confidence in Online Instruction
This study applied the stages of transformative learning to faculty perceptions and application of best practices to online learning. Research questions included: Can transformative learning theory constructs be used to identify potential barriers in faculty development and delivery of online instruction?; How does the stage of transformative learning of online faculty relate to their perceptions about online learning and their application of best practices?; Is there a correlation between stage of transformative learning and the amount of experience with online instruction a faculty member has? Principal component analysis and cluster analysis support a four-component solution. The four constructs equate to Mezirow's four stages of learning: transforming frames of reference through critical reflection of assumptions, validating contested beliefs through discourse, taking action on one's reflective insight, and critically assessing it. Multiple regression analyses were run to predict faculty perceptions on the identified components. Three of these were statistically significant based on years of experience teaching online, the number of professional development workshops taken on online teaching, or both. While the instrument appears to be a valid measurement of transformation of frame of reference, examination of previously contested beliefs, and critical assessment of action, further efforts will be needed before this is …
Date:
August 2017
Creator:
Allen, Julia Elizabeth
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces
The objective of this research was to investigate the performance of two-phase spray cooling with HFC-134a and HFO-1234yf refrigerants using practical enhanced heat transfer surfaces. Results of the study were expected to provide a quantitative spray cooling performance comparison with working fluids representing the current and next-generation mobile air conditioning refrigerants, and demonstrate the feasibility of this approach as an alternative active cooling technology for the thermal management of high heat flux power electronics (i.e., IGBTs) in electric-drive vehicles. Potential benefits of two-phase spray cooling include achieving more efficient and reliable operation, as well as compact and lightweight system design that would lead to cost reduction. The experimental work involved testing of four different enhanced boiling surfaces in comparison to a plain reference surface, using a commercial pressure-atomizing spray nozzle at a range of liquid flow rates for each refrigerant to determine the spray cooling performance with respect to heat transfer coefficient (HTC) and critical heat flux (CHF). The heater surfaces were prepared using dual-stage electroplating, brush coating, sanding, and particle blasting, all featuring "practical" room temperature processes that do not require specialized equipment. Based on the obtained results, HFC-134a provided a better heat transfer performance through higher HTC and …
Date:
August 2017
Creator:
Altalidi, Sulaiman Saleh
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Nuestra Voz (Fort Worth, Tex.), Vol. 3, No. 45, Ed. 1, August 2017
Monthly newspaper providing news and information to the Tarrant, Dallas, and Denton County Latino communities along with advertising.
Date:
August 2017
Creator:
Alvarado, Felix
Object Type:
Newspaper
System:
The Portal to Texas History
Nutrient Budget for Nueces Bay
Studying environmental flow needs for Texas rivers and estuaries as part of the Adaptive Management Phase.
Date:
August 2017
Creator:
Anchor QEA, LLC
Object Type:
Report
System:
The Portal to Texas History
[Letter to Donald James Kepple from John Anderson, August 31, 2017]
A letter from John Anderson to Donald Kepple welcoming him to the Arlington chapter of TXSSAR. Anderson continues by informing Kepple of meeting times and other information on the group's activities.
Date:
August 31, 2017
Creator:
Anderson, John D.
Object Type:
Letter
System:
The UNT Digital Library
Tracing Our Global Connections: A Bibliographic Analysis of UNT Digital Library Item Usage Among Global ETDs
Presentation at the 20th International Symposium on Electronic Theses and Dissertations. This presentation provides an overview of a bibliographic analysis of University of North Texas Digital Library items used in global electronic theses and dissertations (ETDs).
Date:
August 6, 2017
Creator:
Andrews, Pamela; Alemneh, Daniel Gelaw; Harker, Karen & Klein, Janette
Object Type:
Article
System:
The UNT Digital Library
Fostering Connections: Creating an IR Managers Forum
Presentation at the 20th International Symposium on Electronic Theses and Dissertations. This presentation discusses the creation of the IR Managers Forum.
Date:
August 5, 2017
Creator:
Andrews, Pamela; Jerome, Erin; Shorey, Christy & Dabrowski, Anna
Object Type:
Presentation
System:
The UNT Digital Library
Development of a Natural Fiber Mat Plywood Composite
Natural fibers like kenaf, hemp, flax and sisal fiber are becoming alternatives to conventional petroleum fibers for many applications. One such applications is the use of Non-woven bio-fiber mats in the automobile and construction industries. Non-woven hemp fiber mats were used to manufacture plywood in order to optimize the plywood structure. Hemp fiber mats possess strong mechanical properties that comparable to synthetic fibers which include tensile strength and tensile modulus. This study focuses on the use of hemp fiber mat as a core layer in plywood sandwich composite. The optimization of fiber mat plywood was done by performing a three factor experiment. The three factors selected for this experiment were number of hemp mat layers in the core, mat treatment of the hemp mat, and the glue content in the core. From the analysis of all treatments it was determined that single hemp mat had the highest effect on improving the properties of the plywood structure.
Date:
August 2017
Creator:
Anthireddy, Prasanna Kumar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 236, Ed. 1 Tuesday, August 1, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 1, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 237, Ed. 1 Wednesday, August 2, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 2, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 238, Ed. 1 Thursday, August 3, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 3, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 239, Ed. 1 Friday, August 4, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 4, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 240, Ed. 1 Saturday, August 5, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 5, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 240, Ed. 1 Tuesday, August 8, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 241, Ed. 1 Wednesday, August 9, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 9, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 242, Ed. 1 Thursday, August 10, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 10, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 243, Ed. 1 Friday, August 11, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 11, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 244, Ed. 1 Saturday, August 12, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 12, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 245, Ed. 1 Tuesday, August 15, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 15, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 246, Ed. 1 Wednesday, August 16, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
August 16, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History