Digital Commons Network^™

Thermal Conductivity Enhancement Of Epoxy-Based Adhesive Via Incorporating Inorganic Fillers, Chutiphong Sae-Sue

Chulalongkorn University Theses and Dissertations (Chula ETD)

Owing to a poor thermal conductivity of epoxy resin, the requirement of high heat dissipation in electronic packaging is not overcome. In this research, aluminium oxide (Al2O3) and silicon nitride (Si3N4) filled epoxy-based underfill adhesive were prepared by varying filler loading in the range of 0-5% by volume. Additionally, the epoxy composites were also incorporated with silane-treated particles. For the silane surface treatment of filler particles, N-(2-aminoethyl)-3-(trimethoxysilyl) propylamine (AETMP) was used as coupling agent to achieve good dispersion of particles in the polymer matrix. The results showed that when filler loading was increased, thermal conductivity of composites tended to be …

Bodies Bending Boundaries: Religious, Spiritual, And Secular Identities Of Modern Postural Yoga In The Ozarks, Kimberley J. Pingatore

Graduate Theses/Dissertations

Modern postural yoga is an amalgamation of practices that continues to defy traditional explanatory models that understand religious, spiritual, and secular to be mutually exclusive categories. In this project, I conduct in-depth interviews with yoga instructors in the Ozarks. In these interviews, I asked my informants to explain how they understand religious, spiritual, and secular. I then asked if and how they would use those words to describe yoga. These interviews revealed that religious, spiritual, and secular are not mutually exclusive, but are instead related, blended, and connected, especially when used to describe yoga. These findings inform my proposed explanatory …

Immunohistochemical Assessment Of Cytokeratin 17 And Epcam Expression In Different Grades Of Oral Squamous Cell Carcinoma, Safaa El-Baz, Iman Helmy, Mohamed Hosam El Mallahy

Dentistry

Oral squamous cell carcinoma (OSCC), one of the most common malignancies in the head and neck region, is graded based on Broder’s classification into well-differentiated, moderately, and poorly differentiated. Cytokeratin 17 (K17, CK17) is an acid-type I cytokeratin with a low-molecular weight of 48.1 kDa. Epithelial cell adhesion molecule (EpCAM) is a hemophilic Ca2+ independent adhesion molecule. This study used an immunohistochemical technique (IHC) to examine the expression of CK17 and EpCAM in thirty-two specimens of OSCC (comprising 13 well-, 9 moderately, and 10 poorly differentiated cases), and 2 specimens of normal oral mucosa, used as control. It was found …

To Fidget Or Not To Fidget: The Effect Of Movement On Cognition, Kelsey Diane Grodner

Theses and Dissertations

Previous research suggests that there is controversy regarding the effects of fidgeting. On one hand, fidgeting has been associated with inattention. On the other hand, the act of suppressing movement may have extensive costs to cognitive abilities. Thus, allowing fidgeting might be beneficial for attention. However certain fidgeting behaviors, such as large body movements, might be disruptive in certain situations, like a classroom or an office meeting. Fidget toys have been developed that allow for smaller fidgeting movements that are non-disruptive. Most previous studies have been conducted in an elementary school classroom and have used primarily observational data. Here we …

Role Of Student Entitlement And Co-Production On Satisfaction, Deborah Jean Sisson

HCBE Theses and Dissertations

The marketing of services has challenges uncommon to that of marketing products. By nature service offerings are intangible, heterogeneous, perishable, and simultaneously consumed and produced. This simultaneous consumption and production often requires the consumer to participate in the service delivery – co-production. Colleges and universities offer a service which requires high levels of co-production by students and is the setting for this research. As colleges/universities face greater challenges at this time, there is a need for better understanding of the role the student plays in the production process. The service marketing literature offers an understanding of the importance of the …

Conductive Patterns By Spray Pyrolysis Of A Self-Reducing Copper-Amine Complex Ink, Phenfar Benjapongvimon

Chulalongkorn University Theses and Dissertations (Chula ETD)

A conductive pattern prepared by spray pyrolysis of copper-amine complex ink on glass and polyimide (PI) substrates in nitrogen atmosphere. The complex ink was prepared by mixing copper (II) formate, diethanolamine, 25% ammnonia solution and distilled water. The effects of concentration of copper ion, spray pyrolysis temperature, annealing time, type of substrate, rate of deposition and benzimidazole coating were investigated. Concentration of copper ion affected size of copper particles generated. The patterns fabricated at 200 OC had higher packing density than those fabricated at lower temperature. The rate of deposition determined the thickness of well-sintered layer. Therefore, volume resistivity of …

การวัดประสิทธิภาพเชิงเปรียบเทียบของคณะวิศวกรรมศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย, วนัชพร สืบปรุ

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยชิ้นนี้มีวัตถุประสงค์เพื่อวัดประสิทธิภาพการทำงานของคณะวิศวกรรมศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย โดยการประยุกต์ใช้ข้อมูลตัวชีวัดผลการดำเนินงาน (KPI) ปี 2558 ร่วมกับวิธีการล้อมกรอบข้อมูล (Data Envelopment Analysis : DEA) โดย DEA นั้นเป็นการวัดค่าประสิทธิภาพเชิงเปรียบเทียบซึ่งเป็นการวัดอัตราส่วนของปัจจัยนำเข้าและปัจจัยผลผลิต DEA เหมาะสำหรับองค์กรที่ไม่แสวงหาผลกำไร ทำให้ DEA ได้รับความนิยมเป็นอย่างยิ่ง ผลลัพธ์ที่ได้จาก DEA เรียกว่า ค่าประสิทธิภาพ โดยมีค่าตั้งแต่ 0 ถึง 1 ถ้าค่าประสิทธิภาพเชิงเเปรียบเทียบ ยิ่งมีค่ามาก ยิ่งแสดงถึงความมีประสิทธิภาพของหน่วยงานนั้น สำหรับงานวิจัยในครั้งนี้ ขอบเขตงานวิจัยคือ สำนักงานหลักสูตรวิศวกรรมนานาชาติและภาควิชาทั้ง 12 ภาควิชา งานวิจัยชิ้นนี้ได้แบ่งการวัดประสิทธิภาพออกเป็น 3 แบบ คือ การวัดประสิทธิภาพด้านการเรียน การวัดประสิทธิภาพด้านการสอน และการวัดประสิทธิภาพโดยรวม เมื่อทำการวัดประสิทธิภาพแล้ว จะทำให้ทราบว่าแต่ละหน่วยงาน มีประสิทธิภาพการทำงานเป็นอย่างไร นอกจากนี้ ยังสามารถบอกได้ถึงค่าปัจจัยต่างๆที่ควรลดหรือเพิ่มเพื่อให้การดำเนินงานเป็นไปอย่างมีประสิทธิภาพมากขึ้น เมื่อได้วิเคราะห์ข้อมูลด้วยเทคนิคการล้อมกรอบข้อมูลพบว่า เมื่อวัดประสิทธิภาพด้านการสอน พบว่า 7 ภาควิชา (คิดเป็น 53.85%) มีประสิทธิภาพด้านการสอน สำหรับด้านการวิจัย 12 ภาควิชา (คิดเป็น 92.31%) มีประสิทธิภาพในด้านการวิจัย และเมื่อวัดประสิทธิภาพโดยรวม ภาควิชาที่มีประสิทธิภาพ มีทั้งสิ้น 12 ภาควิชา (คิดเป็น 92.31%)

The Extra-Regional Dynamic Of Maritime Security In The South China Sea: A Case Study Of Vietnam And The Philippines From 1974 To The Present, William Fountain Kennedy

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Philippines and Vietnam valued their maritime connections with great powers during the Cold War and have continued to do so after if ended. In the bipolar context of the Cold War, both Manila and Hanoi eventually permitted Washington and Moscow to station naval forces on their coasts. As tension between Washington and Moscow diminished significantly in the early 1990s, maritime security interests of the Philippines and Vietnam changed. The withdrawal of US and Russian naval forces from the South China Sea left China without rivals. Beijing then emerged as an un-checked naval power in the South China Sea. US-China …

Prospects For Detection Of Extragalactic Stellar Black Hole Binaries In The Nearby Universe, Matthew Benacquista, Jesus Hinojosa, Alberto Mata, Krzysztof Belczynski

Physics & Astronomy Faculty Publications

Stellar mass black hole binaries have individual masses between 10-80 solar masses. These systems may emit gravitational waves at frequencies detectable at Megaparsec distances by space-based gravitational wave observatories. In a previous study, we determined the selection effects of observing these systems with detectors similar to the Laser Interferometer Space Antenna by using a generated population of binary black holes that covered a reasonable parameter space and calculating their signal-to-noise ratio. We further our study by populating the galaxies in our nearby (less than 30 Mpc) universe with binary black hole systems drawn from a distribution found in the Synthetic …

Understanding The Gravitational-Wave Hellings And Downs Curve For Pulsar Timing Arrays In Terms Of Sound And Electromagnetic Waves, Fredrick A. Jenet, Joseph D. Romano

Physics & Astronomy Faculty Publications

Searches for stochastic gravitational-wave backgrounds using pulsar timing arrays look for correlations in the timing residuals induced by the background across the pulsars in the array. The correlation signature of an isotropic, unpolarized gravitational-wave background predicted by general relativity follows the so-called Hellings and Downs curve, which is a relatively simple function of the angle between a pair of Earth-pulsar baselines. In this paper, we give a pedagogical discussion of the Hellings and Downs curve for pulsar timing arrays, considering simpler analogous scenarios involving sound and electromagnetic waves. We calculate Hellings-and-Downs-type functions for these two scenarios and develop a framework …

Detection Of Temporal Changes In Vegetative Cover On South Padre Island, Texas Using Image Classifications Derived From Aerial Color-Infrared Photographs, Ruben A. Mazariegos, Kenneth R. Summy, Frank W. Judd, Robert I. Lonard, James H. Everitt

Physics & Astronomy Faculty Publications

Supervised image classifications developed from 23 x 23 cm aerial color-infrared aerial photographs (1:5,000 scale) were used to evaluate temporal changes in vegetative cover occurring within three 150 x 300-m research sites on South Padre Island, Texas. Use of high-resolution digitized imagery (ground pixel resolution of ca. 0.1 m) and survey-grade GPS for positional measurements of ground control points (20-25 1.0m2 targets within each research site) resulted in consistently high levels of geometric accuracy, with root mean square errors (RMSEs) ranging between 0.397 – 2.867. Similarly, use of relatively simple information categories (dry and wet sand, live and dead vegetative …

One-Dimensional Triple Periodic Dual-Beam Microstrip Leaky-Wave Antenna, Zi Long Ma, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, a novel dual-beam microstrip leaky-wave antenna based on one-dimensional triple periodic (TP) structure is proposed. Through theoretical dispersion relation analysis, it is found that compared to the conventional periodic structure, TP structure has reduced the separation of space harmonics. Hence, more space harmonic modes are brought into the leaky-wave radiation region. Through proper design, m = - 1 and m = - 2 modes are excited simultaneously. Consequently, the forward and backward propagation waves of these two modes generate two radiation beams in the far-field region. At different frequencies, symmetrical and asymmetrical beam pairs are realized. It …

The Mass Profile And Shape Of Bars In The Spitzer Survey Of Stellar Structure In Galaxies (S4g) : Search For An Age Indicator For Bars., Taehyun Kim, Kartik Sheth, Dimitri A. Gadotti, Myung Gyoon Lee, Dennis Zaritsky, Bruce G. Elmegreen, E. Athanassoula, Albert Bosma, Benne W. Holwerda, Luis C. Ho, Sebastien Comeron, Johan H. Knapen, Joannah Hinz, Juan Carlos Munoz-Mateos, Santiago Erroz-Ferrer, Ronald J. Buta, Minjin Kim, Eija Laurikainen, Heikki Salo, Barry F. Madore, Jarkko Laine, Karin Menendez-Delmestre, Michael Regan, Bonita De Swardt, Armando Gil De Paz, Mark Seibert, Trisha Mizusawa

Faculty and Staff Scholarship

We have measured the radial light profiles and global shapes of bars using two-dimensional 3.6μm image decompositions for 144 face-on barred galaxies from the Spitzer Survey of Stellar Structure in Galaxies. The bar surface brightness profile is correlated with the stellar mass and bulge-to-total (B/T) ratio of their host galaxies. Bars in massive and bulge-dominated galaxies (B/T > 0.2) show a flat profile, while bars in less massive, disk-dominated galaxies (B/T ∼ 0) show an exponential, disk-like profile with a wider spread in the radial profile than in the bulge-dominated galaxies. The global two-dimensional shapes of bars, however, are rectangular/boxy, independent …

Do Depressive Symptoms Predict The Incidence Of Myocardial Infarction Independent Of Hopelessness?, Patrick Pössel, Amanda M. Mitchell, Kimmo Ronkainen, George A. Kaplan, Jussi Kauhanen, Maarit Valtonen

Faculty and Staff Scholarship

Depression and hopelessness predict myocardial infarction (MI), but it is unclear whether depression and hopelessness are independent predictors of MI incidents. Hopelessness, depression, and MI incidence rate 18 years later were measured in 2005 men. Cox regressions were conducted with hopelessness and depression serving as individual predictors of MI. Another Cox model examined whether the two predictors predict MI when adjusting for each other. Depression and hopelessness predicted MI in independent regressions but when adjusting for each other, hopelessness, but not depression, predicted MI incidents. Thus, these results suggest that depression and hopelessness are not independent predictors of MI.

Integrating Beck’S Cognitive Model And The Response Style Theory In An Adolescent Sample., Stephanie Winkeljohn Black, Patrick Pössel

Faculty and Staff Scholarship

Depression becomes more prevalent as individuals progress from childhood to adulthood. Thus, empirically supported and popular cognitive vulnerability theories to explain depression in adulthood have begun to be tested in younger age groups, particularly adolescence, a time of significant cognitive development. Beck’s cognitive theory and the response style theory are well known, empirically supported theories of depression. The current, two-wave longitudinal study (N = 462; mean age = 16.01 years; SD = 0.69; 63.9 % female) tested various proposed integrative models of Beck’s cognitive theory and the response style theory, as well as the original theories themselves, to determine if …

Developing A Chronic Pain Vocabulary: Communication Preferences Among Individuals With Chronic Pain, Karin L. Becker

Theses and Dissertations

In order to be acknowledged, chronic pain must be voiced yet disclosing of chronic pain is fraught with social and professional repercussions. Moreover, there is a perceived disinterest in hearing about, and a stigma associated with the experience of chronic pain. This research explores the therapeutic value of communicating about pain. Nineteen individuals with chronic pain participated in a six-week online writing workshop to describe the way chronic pain impacts daily activities. These qualitative responses were analyzed using discourse analysis and four interpretive repertoires emerged which convey the multi-faceted impacts of living with chronic pain. These findings informed the creation …

Impact Of Non-Audit Assurance Level (Compilation Versus Review) On Production Management Of Private Manufacturing Companies, Benjamin P. Foster

Faculty and Staff Scholarship

Private small companies have been the subject of much interest by accounting regulators recently. The AICPA issued SSARS 19 and the Financial Reporting Framework for Small- and Medium-Sized Entities in 2009 and 2013, respectively. The Financial Accounting Foundation issued the Blue Ribbon Panel Report on Standard Setting for Private Companies in 2011. This is apparently the first study to compare reporting practices of small private companies whose financial statements are compiled or reviewed.

Overall results indicate that reviewed companies tend to exhibit positive abnormal production while compiled companies tend to exhibit negative abnormal production. However, for the companies most likely …

Engineering Faculty Perspectives On The Nature Of Quality Teaching, Jacqueline C. Mcneil, Matthew W. Ohland

Faculty and Staff Scholarship

There is wide agreement that teaching quality matters in higher education, but faculty have varied ideas about the definition of quality. Faculty definitions of quality teaching were coded using an existing framework. The most common definition of teaching quality (held by 49% of participants) is associated with elitism and restricted access—the best way to improve education is to admit better students. These faculty focus on education as “knowledge transfer” and “learning content.” Another 38% of faculty had a transformational perspective, more focused on process than content, valuing “empowering students,” “developing students,” and “creating an environment for learning.” These faculty refer …

Cryptic Speciation In The Outback : Molecular And Morphological Differentiation Of A New Species Of Aptorchis (Digenea, Plagiorchiidae) From Australian Turtles, Zachary Selzler

Undergraduate Theses and Senior Projects

No abstract provided.

Lexical And Phonological Influences On Picture Naming In Adults, Brianna Jallo

Undergraduate Theses and Senior Projects

No abstract provided.

Expression Of Fibronectin In Urotsa (Bladder) Heterotransplant Tumors, Chelsea Ensz

Undergraduate Theses and Senior Projects

No abstract provided.

Effects Of A1aar And A1bar Knockout On Anxiety And Depression, Erin Krueger

Undergraduate Theses and Senior Projects

No abstract provided.

The Role Of Fibronectin Binding In Borrelia Burgdorferi Pathogenesis, Brooke, Lentz

Undergraduate Theses and Senior Projects

No abstract provided.

Analysis Of Secreted Sparc In Malignant Breast Cancer Cell Lines, Kirsten Mccullough

Undergraduate Theses and Senior Projects

No abstract provided.

The Development And Validation Of Implicit Measures Of Emotional Intelligence, Louis Leo Oberdiear

Graduate Theses/Dissertations

Emotional intelligence (EI) has attracted much attention in the decades since Goleman's (1995) claim that EI is important for success in a wide range of social and professional roles. With this interest has come much debate about whether EI should be defined and measured as a set of abilities or as a set of dispositional self-perceptions. The latter is typically assessed with self-report measures that are susceptible to contamination related to inaccurate self-knowledge and impression management artifacts – problems that may be mitigated by implicit measures. This research used Implicit Association Test (IAT) procedures to develop implicit measures of EI …

Tropical Forest Responses To Large-Scale Experiments, Aaron B. Shiels, Grizelle Gonzalez

United States Department of Agriculture Wildlife Services: Staff Publications

Although artificial by nature, experiments are a necessary part of ecology if we are to understand key mechanisms driving ecosystem structure and function. Experiments range in scale from microscopic to landscape; large-scale experiments are typically more logistically challenging than are small-scale experiments or observational studies. Recently, researchers have been interested in utilizing large-scale experiments to determine how forests respond to environmental change. Large-scale experiments have been more common in temperate than in tropical forests, yet tropical forests contain over half of the world’s species in just 7 percent of the world’s land area. Key threats to tropical biodiversity, such as …

Human–Carnivore Interactions: Lessons Learned From Communities In The American West, Julie K. Young, Zhao Ma, Ann Laudati, Joel Berger

United States Department of Agriculture Wildlife Services: Staff Publications

Types, causes, and intensity of human–carnivore interactions are related to historical context, management policy, and human perception. We used four rural communities in the American West with varying histories and management policies to assess the complexities of human–carnivore interactions and to determine factors influencing individual willingness to coexist with carnivores. By analyzing focus group and interview data from 49 community members, we found that human perceptions towards carnivores and their management were influenced by self-perceived knowledge about carnivores, ability to be heard and have a voice in management decisions, and economic concerns rather than ecological factors. Willingness to coexist with …

Cascading Effects Of Canopy Opening And Debris Deposition From A Large-Scale Hurricane Experiment In A Tropical Rain Forest, Aaron B. Shiels, Grizelle Gonzalez, D. Jean Lodge, Michael R. Willig, Jess K. Zimmerman

United States Department of Agriculture Wildlife Services: Staff Publications

Intense hurricanes disturb many tropical forests, but the key mechanisms driving post-hurricane forest changes are not fully understood. In Puerto Rico, we used a replicated factorial experiment to determine the mechanisms of forest change associated with canopy openness and organic matter (debris) addition. Cascading effects from canopy openness accounted for most of the shifts in the forest biota and biotic processes, which included increased plant recruitment and richness, as well as the decreased abundance and diversity of several animal groups. Canopy opening decreased litterfall and litter moisture, thereby inhibiting lignin-degrading fungi, which slowed decomposition. Debris addition temporarily increased tree basal …

Ecological Role Of Vertebrate Scavengers, James C. Beasley, Zach H. Olson, Travis L. Devault

United States Department of Agriculture Wildlife Services: Staff Publications

Scavenging, or the consumption of dead animal matter, has been documented for a wide array of vertebrate taxa by naturalists and researchers for centuries. Yet, until recently, the importance of scavenging-derived nutrients to many vertebrate species has been largely unknown (DeVault et a1. 2003; Beasley et al. 2012b; Barton et al. 2013). As a result, the role vertebrate scavenging plays in food-web dynamics relative to that of microbes and invertebrates has been greatly underestimated (Wilson and Wolkovich 2011) and has thus become an important area of research. Indeed, in some ecosystems, vertebrates have been documented to assimilate as much as …

Flight Feather Molt In Yellow-Headed Blackbirds (Xanthocephalus Xanthocephalus) In North Dakota, Daniel J. Twedt, George M. Linz

United States Department of Agriculture Wildlife Services: Staff Publications

Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) in central North Dakota undergo prebasic molt or prejuvenile molt during late summer. Nestling Yellow-headed Blackbirds initiate a complete prejuvenile molt, grow their primary and secondary regimes in about 40 days, completing molt after they leave the nest by the first week in August. Remiges are not replaced during the subsequent preformative molt, being retained until the second prebasic molt. Nonlinear (logistic) regression of primary remex growth during definitive prebasic molts of Yellow-headed Blackbirds indicated 38 days were required to complete the linear phase of growth (between 10% and 90% of total primary length). Males added …