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Piezoelectric-Based Gas Sensors for Harsh Environment Gas Component Monitoring (open access)

Piezoelectric-Based Gas Sensors for Harsh Environment Gas Component Monitoring

In this study, gas sensing systems that are based on piezoelectric smart material and structures are proposed, designed, developed, and tested, which are mainly aimed to address the temperature dependent CO2 gas sensing in a real environment. The state-of-the-art of gas sensing technologies are firstly reviewed and discussed for their pros and cons. The adsorption mechanisms including physisorption and chemisorption are subsequently investigated to characterize and provide solutions to various gas sensors. Particularly, a QCM based gas sensor and a C-axis inclined zigzag ZnO FBAR gas sensor are designed and analyzed for their performance on room temperature CO2 gas sensing, which fall into the scope of physisorption. In contrast, a Langasite (LGS) surface acoustic wave (SAW) based acetone vapor sensor is designed, developed, and tested, which is based on the chemisorption analysis of the LGS substrate. Moreover, solid state gas sensors are characterized and analyzed for chemisorption-based sensitive sensing thin film development, which can be further applied to piezoelectric-based gas sensors (i.e. Ca doped ZnO LGS SAW gas sensors) for performance enhanced CO2 gas sensing. Additionally, an innovative MEMS micro cantilever beam is proposed based on the LGS nanofabrication, which can be potentially applied for gas sensing, when combined with …
Date: August 2019
Creator: Zhang, Chen
Object Type: Thesis or Dissertation
System: The UNT Digital Library
New Religious Movements, Mental Health, and Well-Being (open access)

New Religious Movements, Mental Health, and Well-Being

Recent years have observed significant change in the landscape of American religious/spiritual environment and religious/spiritual groups called new religious movements (NRMs) have developed as an alternative for many individuals to engage in religious/spiritual beliefs and practices outside the traditional religions. It was unclear if participation in NRMs provide adherents with similar mental health benefits as participation in traditional religious groups, or whether there might be important differences. The current study examined the link between participation in NRMs and relevant social and psychological outcomes including mental health symptoms, emotional well-being, attachment style, and social relationships. I recruited participants from three groups: (1) NRMs, (2) traditional religious groups, and (3) no religious/spiritual identification. I explored group differences in five key areas of mental health and well-being: (1) mental health symptoms, (2) subjective well-being, (3) attachment, (4) social belonging, and (5) meaning in life. The overall results suggested that NRM participants showed relatively few differences compared to traditional religious participants in regard to the above psychological profile. NRM participants reported more differences compared to participants who were neither religious nor spiritual. In this regard, NRM involvement was associated with some positive outcomes, including positive emotional well-being and meaning in life, and some negative …
Date: August 2019
Creator: Zhang, Hansong
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Fabric of Entropy: A Discussion on the Meaning of Fractional Information (open access)

The Fabric of Entropy: A Discussion on the Meaning of Fractional Information

Why is the term information in English an uncountable noun, whereas in information theory it is a well-defined quantity? Since the amount of information can be quantified, what is the meaning of a fraction of that amount? This dissertation introduces a quasi-entropy matrix which developed from Claude Shannon's information measure as an analytical tool for behavioral studies. Such matrix emphasizes the role of relative characteristics of individual level data across different collections. The real challenge in the big data era is never the size of the dataset, but how data lead scientists to individuals rather than arbitrarily divided statistical groups. This proposed matrix, when combining with other statistical measures, provides a new and easy-to-do method for identifying pattern in a well-defined system because it is built on the idea that uneven probability distributions lead to decrease in system entropy. Although the matrix is not superior to classical correlation techniques, it allows an interpretation not available with traditional standard statistics. Finally, this matrix connects heterogeneous datasets because it is a frequency-based method and it works on the modes of data rather than the means of values. It also visualizes clustering in data although this type of clustering is not measured by …
Date: August 2019
Creator: Zhang, Yuan
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Survey of Solo, Chamber Music and Orchestral Excerpts Selected and Organized Pedagogically for the Intermediate Cellist (open access)

A Survey of Solo, Chamber Music and Orchestral Excerpts Selected and Organized Pedagogically for the Intermediate Cellist

The use of orchestral excerpts from standard music repertoire as a pedagogical means has been adopted by many instrumental pedagogues to train the advanced instrumentalist. This dissertation presents an innovative idea among the excerpt tradition by drawing excerpts from solo, chamber music and orchestral music to function as etudes for the intermediate level cellist. 320 music excerpts are drawn and organized under the headings of different technical categories in order to train the techniques within the context of quality music. The purpose of the dissertation is to introduce the young player to the concept that techniques and musical expression are not two separated entities, rather, techniques serve as a medium to convey the music.
Date: August 2019
Creator: Zhou, Lejing, 1986-
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Adult Attachment, Cultural Orientation and Sacrifice in Couples: A Comparison between American and Chinese Samples (open access)

Adult Attachment, Cultural Orientation and Sacrifice in Couples: A Comparison between American and Chinese Samples

The present study examined the effects of adult attachment and cultural orientation on sacrifice behaviors and the corresponding emotional reactions, using a cross-cultural sample in the U.S. and China. Strain-tests protocol was utilized in this study, in which an individual (i.e., the asker) was asked to share with their romantic partner a personal goal that required a major sacrifice from their partner (i.e., the responder), and then entered a discussion to process their plan of carrying out this goal. The final sample included 115 couples from the U.S. and 99 couples from China. Results indicated that responder's attachment avoidance was negatively associated with sacrifice offered to their partners and they reported more positive emotions as a result. The interaction between attachment anxiety and nationality was significant. Specifically, in the U.S. sample, individuals with high attachment anxiety were more likely to offer sacrifice for their partners, but this effect was reversed in the Chinese sample. In addition, interdependent self-construal (ISC) was a significant moderator for the relation between attachment anxiety and sacrifice behavior. Individuals who endorsed higher ISC and higher anxious attachment were less likely to make sacrifice for their partner. Furthermore, when individual offered more sacrifice, they reported more positive …
Date: August 2019
Creator: Zhu, Wenzhen
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Quantum Physics as Analogy: A Response to "Quantum Misuse in Psychic Literature" (open access)

Quantum Physics as Analogy: A Response to "Quantum Misuse in Psychic Literature"

Abstract: As one of the authors whose work the two retired physicists Jack A. Mroczkowski and Alexis P. Malozemoff (2019) discussed in their article "Quantum Misuse in Psychic Literature," which appears elsewhere in this journal issue, I appreciate the invitation to write this response. In it I will offer my views on quantum physics and the role of consciousness, further information about studies pertaining to near-death experiences (NDEs) and consciousness in general, and several quotations from my book that substantiate my use of quantum physics as analogy rather than established fact as it pertains to consciousness.
Date: Spring 2019
Creator: van Lommel, Pim
Object Type: Article
System: The UNT Digital Library