Digital Commons Network^™

Analysis Of The Geosocial Landscape In The City Of Toronto, Courtney J. Jones

Theses and Dissertations (Comprehensive)

Microblogging on geosocial platforms is a popular form of online communication where users post information about their daily lives and challenges. Since the launch of Twitter in 2006, information sharing through social media has become a largely unused data repository. Tweets often convey content about the users sentiment as it is happening. As such, Tweets can be viewed as a proxy of public mood. In this thesis, I performed a sentiment analysis of all public geo-located Tweets posted by a variety of Twitter users between September 2013 and October 2014. Each Tweet was processed through a custom algorithm to extract …

Motivating Parents Of Kids With Asthma To Quit Smoking: The Effect Of The Teachable Moment And Increasing Intervention Intensity Using A Longitudinal Randomized Trial Design, Belinda Borrelli, Erin M. Tooley

Arts & Sciences Faculty Publications

Aims—We tested two aims: 1) The Teachable Moment (TM): whether second hand smoke exposure (SHSe) feedback motivates cessation in parents of children with asthma vs. parents of healthy children (HC) and 2) whether greater intervention intensity (Enhanced-PAM) produces greater cessation than a previously tested intervention (Precaution Adoption Model; PAM).

Design and interventions—Aim 1: Two home visits (asthma education or child wellness), and cessation induction using Motivational Interviewing and SHSe feedback. Aim 2: Post home-visits, parents with asthmatic children were randomized to PAM (n=171; 6 asthma education calls) or Enhanced-PAM (n=170; 6 asthma education/smoking cessation calls + repeat SHSe …

Perceptions Of Ict Use In Rural Brazil: Factors That Impact Appropriation Among Marginalized Communities, Paola Prado, Alejandro Tirado-Alcaraz, Mauro Araújo Câmara

Arts & Sciences Faculty Publications

This study of digital inclusion among the rural poor examines how residents of remote mountain communities in Brazil perceive the use of information and communication technologies (ICTs). It analyzes social factors that impact ICT appropriation and the behaviors and attitudes that advance digital literacy among marginalized rural populations. The authors conducted factor analysis and logistic regressions to survey data collected. Results confirm the presence of a gender divide in ICT adoption. Women were more likely to perceive that ICT use brings social benefits to the community, and considered that ICTs provide better opportunities for the young.

Nanostructured Materials Prepared By Atomic Layer Deposition For Catalysis And Lithium-Ion Battery Applications, Rajankumar Patel

Doctoral Dissertations

"Atomic/molecular layer deposition (ALD/MLD) has emerged as an important technique for depositing thin films in both scientific research and industrial applications. In this dissertation, ALD/MLD was used to create novel nanostructures for two different applications, catalysis and lithium-ion batteries.

MLD was used to prepare ultra-thin dense hybrid organic/inorganic polymer films. Oxidizing the hybrid films removed the organic components and produced the desired nanoporous films. Both porous alumina and titania films can be prepared by such a way. A novel nanostructured catalyst (Pt/SiO₂) with an ultra-thin porous alumina shell obtained from the thermal decomposition of an aluminium alkoxide film …

Single Particle-Inductively Coupled Plasma-Mass Spectrometry Technology Development For Metallic Nanoparticle Characterization In Complex Matrices, Yongbo Dan

Doctoral Dissertations

"As the rapid growing of nanotechnology, the release of engineered nanoparticles (ENPs) into the environment is inevitable. After entering the real environment, ENPs tend to react with different components of the ecosystem (e.g. water, soil, air, plants) and make their characterization difficult. Analyzing ENPs in these complex matrices still remains as a grand challenge. ENPs characterization is normally the first step of risk assessment. Current analytical techniques have shown some limitations in revealing the unique characteristics of ENPs in complex matrices and reliable analytical techniques are in urgent need. Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) is an emerging …

Bioactivity/Cytotoxicity Of Micro-/Nano-Materials And Novel Development Of Fiber-Optic Probes For Single Cell Monitoring, Qingbo Yang

Doctoral Dissertations

"Manufactured nano-/micro-materials (MNMs) have been widely used and their interactions with niche biological environment are highly concerned for both of their biohazardous and bioactive effects, whereas no available comprehensive evaluations or regulations have been provided yet. This dissertation thus focuses on three major aspects: 1) fundamental toxicity understandings of a typical MNMs (zinc oxide nanoparticles), 2) bioactivity evaluations of representative bioactive MNMs, and 3) development of novel micro-probes for high spatial resolution monitoring. Firstly, the NP's concentration, irradiation, hydrodynamic size, and the localized pH, ionic strength, NP zeta-potential as well as dissolved oxygen levels were found correlated with the production …

Modeling Daily Electricity Load Curve Using Cubic Splines And Functional Principal Components, Abdelmonaem Salem Jornaz

Doctoral Dissertations

"Forecasting electricity load is very important to the electric utilities as well as producers of power because accurate predictions can cut down costs by avoiding power shortages or surpluses. Of specific interest is the 24-hour daily electricity load profile, which provides insight into periods of high demand and periods where the use of electricity is at a minimum. Researchers have proposed many approaches to modeling electricity prices, real-time load, and day-ahead demand, with varying success. In this dissertation three new approaches to modeling and forecasting the 24-hour daily electricity load profiles are presented. The application of the proposed methods is …

Microwave Material Characterization Of Alkali-Silica Reaction (Asr) Gel In Cementitious Materials, Ashkan Hashemi

Doctoral Dissertations

"Since alkali-silica reaction (ASR) was recognized as a durability challenge in cement-based materials over 70 years ago, numerous methods have been utilized to prevent, detect, and mitigate this issue. However, quantifying the amount of produced ASR byproducts (i.e., ASR gel) in-service is still of great interest in the infrastructure industry. The overarching objective of this dissertation is to bring a new understanding to the fundamentals of ASR formation from a microwave dielectric property characterization point-of-view, and more importantly, to investigate the potential for devising a microwave nondestructive testing approach for ASR gel detection and evaluation. To this end, a comprehensive …

Continuous Flow Reactor For Carbonic Acid Hydrolysis/Pretreatment Of Microalgal Biomass To Produce Bioethanol, Nicholas Dudenhoeffer

Doctoral Dissertations

"In order to maximize bioethanol production an efficient pretreatment method for the hydrolysis of polysaccharides to fermentable sugars is necessary. Commonly used pretreatment methods are the slow enzymatic hydrolysis and the corrosive mineral acid hydrolysis process that requires a post-treatment neutralization step and generates waste stream. We investigated the high temperature water with carbonic acid catalyst as an alternative method. Carbonic acid generated from dissolved CO₂ is inexpensive and environmentally benign, and easily removed by decompression. A high pressure continuous flow reactor that can continuously process the wet biomass stream and perform the carbonic acid hydrolysis in-situ using the …

Existence And Classification Of Nonoscillatory Solutions Of Two Dimensional Time Scale Systems, Özkan Özturk

Doctoral Dissertations

"During the past years, there has been an increasing interest in studying oscillation and nonoscillation criteria for dynamic equations and systems on time scales that harmonize the oscillation and nonoscillation theory for the continuous and discrete cases in order to combine them in one comprehensive theory and eliminate obscurity from both.

We not only classify nonoscillatory solutions of dynamic equations and systems on time scales but also guarantee the (non)existence of such solutions by using the Knaster fixed point theorem, Schauder - Tychonoff fixed point theorem, and Schauder fixed point theorem. The approach is based on the sign of nonoscillatory …

Contribution Of New Thiol Antioxidant In The Treatment Of Acetaminophen Toxicity, Ahdab Naeem Khayyat

Doctoral Dissertations

"Acetaminophen (N-acetyl-p-aminophenol, APAP) is one of the most widely used over-the-counter antipyretic analgesic medications. It is safe at therapeutic doses, but an overdose can result in severe hepato-nephrotoxicity, a leading cause of drug-induced acute liver failure in the U.S. Although a few different mechanisms have been proposed for APAP-induced toxicity, a significant amount of evidence has pointed to the potential involvement of oxidative stress in acetaminophen toxicity. Depletion of glutathione (GSH) is one of the initiating steps in APAP-induced toxicity; therefore, one strategy for restricting organ damage is to restore GSH levels by using GSH prodrugs like N-acetylcysteine (NAC). Although …

Cable Shovel Dipper Stress And Fatigue Failure Modeling In Formation Excavation Engineering, Muhammad Azeem Raza

Doctoral Dissertations

"Large capacity shovels are used to achieve economic bulk production in surface mining operations. The suspended payload combined with dipper weight and formation resistive forces results in severe stress loading of the shovel front-end assembly. Material flaws, high stresses and harsh excavation conditions can initiate cracks in the dipper-teeth assembly. High stresses can cause these cracks to propagate to critical lengths resulting in fatigue failure, unscheduled downtimes, costly unplanned repairs, and downstream processing circuit problems. The literature reveals that dipper-related problems significantly reduce shovel up-time. This research is a pioneering effort towards developing a solid frame work for stress profiling, …

Modeling Gas Inflow For Extremely Low Permeability Shale Using Cfd, Chatetha Chumkratoke

Doctoral Dissertations

"Computational fluid dynamics (CFD) has been used to model 2-D well inflow over a range of permeabilities to study the impact of various well completion strategies (Augustine, 2011). Augustine's 2-D model was subsequently extended for 3-D flow by Thepporprapakorn (2013), for gas flow in the permeability range of tight gas (0.01 mD).

This work presents a 3-D CFD model of gas inflow valid for extremely low ranges of permeability (0.00001 mD). In extremely low permeability, gas flow is complex and includes flow from fractures, flow through porous media, and diffusive gas transport. Diffusive gas transport is important when strong density …

Modeling Explosive Lensing On A Cylindrical Body In Air: A First Step Towards Sealing An Underwater Offshore Oil Spill, Phillip R. Mulligan

Doctoral Dissertations

"In 2010, the British Petroleum (BP) Deepwater Horizon accident leaked oil into the Gulf of Mexico for 87 days. A fast response method that can seal an oil pipe and stop the release of oil is needed in order to prevent future oil leaks from turning into ecological and financial disasters. Explosives can serve this need.

This research examined how a circular implosive discontinuous explosive lens interacts with a cylindrical surface. The following research was designed to study the applicability of the Method this author developed to predict the peak pressure from multiple shockwaves converging on a centrally located cylinder. …

Development Of Implants Composed Of Bioactive Materials For Bone Repair, Wei Xiao

Doctoral Dissertations

"The purpose of this Ph.D. research was to address the clinical need for synthetic bioactive materials to heal defects in non-loaded and loaded bone. Hollow hydroxyapatite (HA) microspheres created in a previous study were evaluated as a carrier for controlled release of bone morphogenetic protein-2 (BMP2) in bone regeneration. New bone formation in rat calvarial defects implanted with BMP2-loaded microspheres (43%) was significantly higher than microspheres without BMP2 (17%) at 6 weeks postimplantation. Then hollow HA microspheres with a carbonate-substituted composition were prepared to improve their resorption rate. Hollow HA microspheres with ~12 wt. % of carbonate showed significantly higher …

Identifying Shallow Subsurface Stratigraphy And Voids Using Dispersive Characteristics Of Electromagnetic And Surface Waves, Payman Hajiani

Doctoral Dissertations

"This dissertation presents the results of three manuscripts on spectral analysis of electromagnetic and seismic surface waves to detect subsurface stratigraphy and voids. In the first manuscript, a new technique was developed by utilizing spectral analysis of surface waves to detect subsurface openings. This technique applied the concept of group delay to evaluate the effects of subsurface voids on the phase shift domain. Seismic data sets were acquired at different sites where the shape, size, and depth of the void varied. In all surveys, the time delay technique precisely identified the locations of the subsurface openings. The second manuscript presents …

Relationship Between Fasting Plasma Glucose Levels And Maternal Food Group And Macronutrient Intakes In Pregnancy, Laura Mullaney, Aisling Brennan, Shona Cawley, Amy C. O'Higgins, Daniel Mccartney, Michael J. Turner

Articles

Aim Increased maternal body mass index (BMI) has been consistently associated with elevated blood glucose levels during pregnancy. Studies to date investigating the relationship between maternal blood glucose levels and dietary intake have shown mixed results. We investigated the association between maternal fasting plasma glucose (FPG) levels and food group and macronutrient intakes in the first trimester of pregnancy, after adjustment for maternal bodyweight.

Methods Women were recruited after sonographic confirmation of an ongoing singleton pregnancy in the first trimester. Dietary information was collected using the validated Willett Food Frequency Questionnaire. Maternal height and weight were measured and BMI calculated. …

Use Of A Web-Based Dietary Assessment Tool In Early Pregnancy, Laura Mullaney, Amy C. O'Higgins, Shona Cawley, R. Kennedy, Daniel Mccartney, M.J. Turner

Articles

Background Maternal diet is critical to fetal development and lifelong health outcomes. In this context, dietary quality indices in pregnancy should be explicitly underpinned by data correlating food intake patterns with nutrient intakes known to be important for gestation.

Aims Our aim was to assess the correlation between dietary quality scores derived from a novel online dietary assessment tool (DAT) and nutrient intake data derived from the previously validated Willett Food Frequency Questionnaire (WFFQ).

Methods 524 women completed the validated semiquantitive WFFQ and online DAT questionnaire in their first trimester. Spearman correlation and Kruskal–Wallis tests were used to test associations …

The Microenvironment Of Visceral Adipose Tissue And Liver Alter Natural Killer Cell Viability And Function, Melissa J. Conroy, Vivienne Fitzgerald, Suzanne Doyle, Shauna Channon, Zivile Useckaite, Niamh Gilmartin, Cliona O'Farrelly, Narayanasamy Ravi, John V. Reynolds, Joanne Lysaght

Articles

The role of NK cells in visceral adipose tissue (VAT) and liver inflammation in obesity is not fully understood. This study investigated the frequency, cytokine expression, chemokine receptor, and cytotoxicity receptor profile of NK cells in the blood, omentum, and liver of patients with the obesity-associated cancer, oesophageal adenocarcinoma (OAC). The effect of chronically inflamed tissue microenvironments on NK cell viability and function was also examined. We identified significantly lower NK cell frequencies in the liver of OAC patients compared with healthy controls and within the omentum and liver of OAC patients compared with blood, whereas IL-10-producing populations were significantly …

Negotiating Cultural Spaces In An International Mobile And Blended Learning Project, Charlotte Nirmalani Gunawardena, Agnieszka Palalas, Nicole Berezin, Caitlin Legere, Gretchen Kramer, Godwin Amo-Kwao

University Libraries & Learning Sciences Faculty and Staff Publications

This paper explores the cultural spaces that had to be negotiated by a team of North American and Ghanaian partners when designing, developing and implementing a mobile and blended learning solution to train physician assistants in Ghana. In addition, it examines how these cultural spaces correspond to five mobile and blended learning spaces: temporal, physical, transactional, technological and pedagogical. Employing qualitative narrative inquiry and paradigmatic analysis procedures, we analyzed six types of data to determine the cultural spaces that emerged. Results indicate that cultural spaces were most often negotiated in the transactional mobile and blended learning space and included: identity …

Notes From The Editors, Erin Mccarthy, Lisa Trivedi, Tami Blumenfield

Asian Studies Publications

It gives us great pleasure to publish our first issue of ASIANetwork Exchange: A Journal of Asian Studies for the Liberal Arts as a part of the Open Library of the Humanities (OLH)!

When The Fourth Estate Becomes A Fifth Column: The Effect Of Media Freedom And Social Intolerance On Civil Conflict, Marc L. Hutchison, Salvatore Schiano, Jenifer Whitten-Woodring

Political Science Faculty Publications

Media freedom is typically viewed as crucial to democracy and development. The idea is that independent news media will facilitate free and fair elections and shine a spotlight on corruption—thereby serving as a fourth estate. Yet political leaders often justify restricting media freedom on the grounds that irresponsible news coverage will incite political violence—potentially undermining government and in effect acting as a fifth column. So is media freedom a force for democracy or a source of civil conflict? We hypothesize that the effect of media freedom on civil conflict is conditioned by a country’s level of intolerance. Specifically, we predict …

When Partisans And Minorities Interact: Interpersonal Contact, Partisanship And Public Opinion Preferences On Immigration Policy, Shanna Pearson-Merkowitz, Alexandra Filindra, Joshua J. Dyck

Political Science Faculty Publications

Objective: Many studies investigating contact theory have suggested that contact effects are not universal but rather conditional. In this article, we test one form of conditional contact effects. Our approach posits that contact with out-groups produces support for pro-minority public policies only when in-group members are not subject to contrary messages from co-partisans.

Methods: We use data from an original survey to test this theory in the immigration policy domain.

Results: We find strong confirmatory evidence that the emergence of contact effects on support for a path to citizenship for undocumented immigrants is dependent on party identification. …

Social Media, Public Discourse And Civic Engagement In Modern China, Yinjiao Ye, Ping Xu, Mingxin Zhang

Political Science Faculty Publications

Drawing on the theoretical view of cyberspace’s role in engagement in public discourse and civic activities, the current study investigates how social media use is related to public discourse and civic engagement in mainland China. Moreover, we examine how political interest, general trust in people, and life satisfaction modify the interdependence of social media use and public discourse and civic engagement. Data analyses based on a survey of 1, 202 online Chinese show that social media use is significantly related to both public discourse and civic engagement. In addition, political interest has a consistent, strong modification on the role of …

Does Global Market Integration Weaken Opinion-Policy Congruence In The American States?, Bret Anderson, Brian S. Krueger, Ping Xu

Political Science Faculty Publications

Theories of economic globalization suggest that public opinion-public policy congruence should be affected by a state's degree of integration with international markets. With as much attention researchers have given to the opinion-policy linkage in the American states, it is surprising that this literature has neglected these well-known globalization frameworks. We take advantage of the wide variation in U.S. states’ integration in global markets, public policies, and political orientations of citizens, to assess whether global market integration depresses the association between citizen opinion and public policies. Using three decades of state-level data, our results suggest that high global market integration does …

Trust In China? The Impact Of Development, Inequality, And Openness On Political Trust Across China’S Provinces, 2001-2012, Marc L. Hutchison, Ping Xu

Political Science Faculty Publications

China has long represented a puzzle for scholars of democracy, who view political trust as an important indicator of regime legitimacy. Previous studies show that while democracies around the world experienced declining levels of political trust, the authoritarian Chinese government maintained unexpectedly high levels of trust. Using World Value Survey (WVS) data over a critical twelve-year period (2001-2012) and multilevel modeling techniques, we explore both macro- and individual-level determinants of political trust in China. We find that province-level economic performance and individual level income combine to influence political trust. Higher levels of individual-level income have a positive effect on trust …

Table Of Contents

Journal of Strategic Security

No abstract provided.

Defeating Isis On The Battle Ground As Well As In The Online Battle Space: Considerations Of The “New Normal” And Available Online Weapons In The Struggle Ahead, Anne Speckhard, Ph.D., Ardian Shajkovci, Ph.D., Ahmet S. Yayla, Ph.D.

Journal of Strategic Security

The United States and its allies continue to achieve significant military victories against ISIS (otherwise known as ISIL or the “Islamic State”). The loss of territories resulting from military victories is especially important given that ISIS relies in part on recruits from the territories it controls. Efforts have also been directed at killing the group’s core leadership; stemming the flow of foreign fighters to Iraq and Syria through tightening up border security and surveillance; and targeting militant jihadi narratives and propaganda that is pushed out by ISIS on a twenty-four/seven basis via the Internet and social media platforms. In such …

Wicked Problems: How Complexity Science Helps Direct Education Responses To Preventing Violent Extremism, Lynn Davies

Journal of Strategic Security

This article draws on the insights from complexity science to outline potential strategies within education which could interrupt the spread of violent extremism. It first identifies three problems in examining extremism - definitions, causes and targets—before arguing for a focus on systems, not individual learners. Within systems, diversity is needed for emergence, and narrow, hard secularism is rejected in favor of a dynamic secularism which encourages a variety of belief systems in order to guard against polarization. The systems of education, religion, law and of terrorism itself are analyzed to identify entry points and vulnerabilities. After looking at the theories …

I See! Scotland: Tackling Sectarianism And Promoting Community Psychosocial Health, Eolene M. Boyd-Macmillan, Patricia Andrews Fearon, Amanda M. Ptolomey, Laura J. Mathieson

Journal of Strategic Security

We developed and tested through two studies a new intervention run as a course, I SEE! Scotland, to reduce and prevent Protestant-Catholic sectarianism in Scotland, a historic inter-group conflict expressed in forms ranging from polite to violent, within a wider population that includes those who feel untouched. Designed to reflect the social ecology of Scotland and engage individuals regardless of sectarian involvement, the intervention aimed to increase cognitive complexity, measured as integrative complexity, through participatory theatre and experiential methods. We hypothesised that the confluence of experiential learning to support multiple forms of self, other, and systems awareness with narrative framing …