Digital Commons Network^™

Carbon Amendments Influence Composition And Functional Capacities Of Indigenous Soil Microbiomes, José Pablo Dundore-Arias, Sarah C. Castle, Laura Felice, Ruth Dill-Macky, Linda L. Kinkel

Biology, Agriculture and Chemistry Faculty Publications and Presentations

Soil nutrient amendments are recognized for their potential to improve microbial activity and biomass in the soil. However, the specific selective impacts of carbon amendments on indigenous microbiomes and their metabolic functions in agricultural soils remain poorly understood. We investigated the changes in soil chemical characteristics and phenotypes of Streptomyces communities following carbon amendments to soil. Mesocosms were established with soil from two field sites varying in soil organic matter content (low organic matter, LOM; high organic matter, HOM), that were amended at intervals over nine months with low or high dose solutions of glucose, fructose, malic acid, a mixture …

Electrochemically Desulfurized Molybdenum Disulfide (Mos2) And Reduced Graphene Oxide Aerogel Composites As Efficient Electrocatalysts For Hydrogen Evolution, Sanju Gupta, Taylor Robinson, Nicholas Dimakis

Physics & Astronomy Faculty Publications

Recent developments in graphene related materials including molybdenum disulfide (MoS₂) is gaining popularity as efficient and cost-effective nanoscale electrocatalyst essential for hydrogen production. These “clean” energy technologies require delicate control over geometric, morphological, chemical and electronic structure affecting physical and electrochemical catalytic properties. In this work, we prepared three-dimensional hierarchical mesoporous aerogels consisting of two-dimensional functionalized graphene and MoS₂ nanosheets of varying ratio of components under hydrothermal–solvothermal conditions (P bar, T °C). We systematically characterized these hybrid aerogels in terms of surface morphology, microstructure, understand heterointerfaces interaction through electron microscopy, X-ray diffraction, optical absorption and emission …

A Joint Fermi-Gbm And Ligo/Virgo Analysis Of Compact Binary Mergers From The First And Second Gravitational-Wave Observing Runs, R. Hamburg, C. Fletcher, E. Burns, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Volker Quetschke, Malik Rakhmanov, Karla E. Ramirez, Wenhui Wang, Adam Zadrozny

Physics & Astronomy Faculty Publications

We present results from offline searches of Fermi Gamma-ray Burst Monitor (GBM) data for gamma-ray transients coincident with the compact binary coalescences observed by the gravitational-wave (GW) detectors Advanced LIGO and Advanced Virgo during their first and second observing runs. In particular, we perform follow-up for both confirmed events and low significance candidates reported in the LIGO/Virgo catalog GWTC-1. We search for temporal coincidences between these GW signals and GBM-triggered gamma-ray bursts (GRBs). We also use the GBM Untargeted and Targeted subthreshold searches to find coincident gamma-rays below the onboard triggering threshold. This work implements a refined statistical approach by …

Gw190814: Gravitational Waves From The Coalescence Of A 23 Solar Mass Black Hole With A 2.6 Solar Mass Compact Object, R. Abbott, T. D. Abbott, S. Abraham, A. Aich, G. Bissenbayeva, Teviet Creighton, Mario C. Diaz, Soma Mukherjee

Physics & Astronomy Faculty Publications

We report the observation of a compact binary coalescence involving a 22.2 - 24.3 M⊙ black hole and a compact object with a mass of 2.50 - 2.67 M⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal, GW190814, was observed during LIGO's and Virgo's third observing run on August 14, 2019 at 21:10:39 UTC and has a signal-to-noise ratio of 25 in the three-detector network. The source was localized to 18.5 deg2 at a distance of 241+41−45 Mpc; no electromagnetic counterpart has been confirmed to date. The source has the most unequal mass ratio yet measured with …

Bayesian Modelling Of Nonlinear Poisson Regression With Artificial Neural Networks, Hansapani Rodrigo, Chris P. Tsokos

School of Mathematical & Statistical Sciences Faculty Publications

Modelling and prediction of count and rate responses have substantial usage in many fields, including health, finance, social, etc. Conventionally, linear Poisson regression models have been widely used to model these responses. However, the linearity assumption of the systematic component of linear Poisson regression models restricts their capability of handling complex data patterns. In this regard, it is important to develop nonlinear Poisson regression models to capture the inherent variability within the count data. In this study, we introduce a probabilistically driven nonlinear Poisson regression model with Bayesian artificial neural networks (ANN) to model count and rate data. This new …

Historical Trends In Air Temperature, Precipitation, And Runoff Of A Plateau Inland River Watershed In North China, Along Zhang, Ruizhong Gao, Xixi Wang, Tingxi Liu, Lijing Fang

Civil & Environmental Engineering Faculty Publications

Understanding historical trends in temperature, precipitation, and runoff is important but incomplete for developing adaptive measures to climate change to sustain fragile ecosystems in cold and arid regions, including the Balagaer River watershed on the Mongolian Plateau of northeast China. The objective of this study was to detect such trends in this watershed from 1959 to 2017. The detection was accomplished using a Mann-Kendall sudden change approach at annual and seasonal time scales. The results indicated that the abrupt changes in temperature preceded that in either runoff or precipitation; these abrupt changes occurred between 1970 and 2004. Significant (α = …

Seismic Response Mitigation Of Base-Isolated Buildings, Mohammad Hamayoun Stanikzai, Said Elias, Rajesh Rupakhety

Civil & Environmental Engineering Faculty Publications

Earthquake response mitigation of a base-isolated (BI) building equipped with (i) a single tuned mass damper at the top of the building, (ii) multiple tuned mass dampers (MTMDs) at the top of the building, and (iii) MTMDs distributed on different floors of the building (d-MTMDs) is studied. The shear-type buildings are modeled by considering only one lateral degree of freedom (DOF) at the floor level. Numerical approach of Newmark's integration is adopted for solving the coupled, governing differential equations of motion of 5- and 10-story BI buildings with and without TMD schemes. A set of 40 earthquake ground motions, scaled …

Evaluation Of Lead (Pb(Ii)) Removal Potential Of Biochar In A Fixed-Bed Continuous Flow Adsorption System, Pushpita Kumkum, Sandeep Kumar

Civil & Environmental Engineering Faculty Publications

Background. Lead (Pb(II)) exposure from drinking water consumption is a serious concern due to its negative health effect on human physiology. A commercially available filter uses the adsorption potential of activated carbon for removing heavy metals like Pb(II). However, it has some constraints since it uses only surface area for the adsorption of these contaminants. Biochar produced via slow pyrolysis of biomass shows the presence of oxygen-containing functional groups on its surface that take part in the adsorption process, with higher removal potential compared to activated carbon.

Objectives. The current study examined the adsorption kinetics and mechanisms of Pb(II) removing …

Lateral-Torsional Buckling Strength Of Two-Span Glass Fiber Reinforced Polymer Beams, Mojtaba B. Sirjani, Zia Razzaq

Civil & Environmental Engineering Faculty Publications

This paper presents the outcome of a study of two-span glass fiber reinforced polymer (GFRP) I-section beams susceptible to lateral-torsional buckling when subjected to gradually increasing concentrated vertical load(s) in the presence of two different types of lateral bracing schemes. It is found that loading one span results in a smaller buckling load as compared with the cases with loading in both spans regardless of the type of bracing scheme used. Also, the study shows that the addition of midspan braces for the GFRP beams results in up to 5.5 times increase in the buckling load capacity.

Nonhydrostatic Modeling Of Flow Interactions With Highly Flexible Vegetation, Navid Tahvildari, Ramin Familkhalili, Gangfeng Ma

Civil & Environmental Engineering Faculty Publications

Improving our understanding of the interactions between gravity waves, currents, and coastal vegetation, which are nonlinear in nature, enables coastal engineers and managers to better estimate hydrodynamic forces on coastal infrastructure and utilize natural elements to mitigate their impacts. Aquatic vegetation is ubiquitous in coastal waters and it is well-known that flow loses energy over vegetation. Computational modeling of wave-vegetation interaction has been the subject of numerous recent studies and many improvements have been achieved in reducing limitations applied on wave and vegetation behavior in these models. Mechanisms for highly flexible vegetation have been incorporated in a Boussinesq-type model and …

Parameter Estimation Of A Seasonal Poisson Inar(1) Model With Different Monthly Means, Turaj Vazifedan, Homa Jalaeian Taghadomi, Xixi Wang, Mujde Erten-Unal

Civil & Environmental Engineering Faculty Publications

Analysing seasonality in count time series is an essential application of statistics to predict phenomena in different fields like economics, agriculture, healthcare, environment, and climatic change. However, the information in the existing literature is scarce regarding the performances of relevant statistical models. This study provides the Yule-Walker (Y-W), Conditional Least Squares (CLS), and Maximum Likelihood Estimation (MLE) for First-order Non-negative Integer-valued Autoregressive, INAR(1), process with Poisson innovations with different monthly means. The performance of Y-W, CLS, and MLE are assessed by the Monte Carlo simulation method. The performance of this model is compared with another seasonal INAR(1) model by reproducing …

All Roads Lead To Rome: A Jurisprudential Genealogy Of Feminism, Sexual And Gender-Based Violence And International Criminal Law, Jessica M. Zaccagnino

Connecticut Journal of International Law

Sexual and gender-based violence is prevalent in armed conflicts throughout all corners of the world. The elevation—and recognition—of sexual and gender-based violence as violence qua violence is an arduous and continual struggle. Although international humanitarian and human rights law purports to proscribe sexual and gender-based violence, the language of the law often minimizes the gravity of this violence and fails to hold perpetrators accountable. This Article argues that to elevate sexual and gender-based violence crimes in the international humanitarian and criminal law hierarchy, there must be a radical reconceptualization of gender under international law. But, in order to envision the …

The Complexities Of Democracy, Development, And Human Rights In China's Belt And Road Initiative, Diane A. Desierto

Connecticut Journal of International Law

China's Belt and Road Initiative (BRI)—a dense network of China-funded multi-year infrastructure projects in over 65 countries from the Western Pacific to the Baltic Sea, collectively aiming to establish China's strategic "Maritime Belt" and "Silk Road" connectivity using an estimated range of USD$1 Trillion to USD$8 Trillion—is as unprecedented phenomenon in sovereign project financing and bilateral investment lending, since the United States' grant of USD $800 Billion for the Marshall Plan was for Europe’s post World War II reconstruction. The scale, scope, and terms of BRI projects remain shrouded in relative opacity, with China as of this writing only incrementally …

The Mathematics Of The Astrolabe And Its History, Graziano Gentili, Luisa Simonutti, Daniele C. Struppa

Mathematics, Physics, and Computer Science Faculty Articles and Research

In this article we trace the scientific and cultural history of the astrolabe, a mechanical instrument used in the past for astronomical measurements and navigational purposes. The story of the astrolabe is interesting from several points of view, since it intertwines mathematical developments, geographical explorations, changing worldviews, and different cultures and civilizations. In our explorations we move from the early understanding of the world due to the Greeks, to the loss of their work, its rediscovery, the reception of Arab thinkers in Western natural philosophy, and, finally, to the new European culture that emerged with the end of the Middle …

Self-Actualized Leadership: Exploring The Intersection Of Inclusive Leadership And Workplace Spirituality At A Faith-Based Institution Of Higher Education, Kerri Cissna

Theses and Dissertations

Today’s leaders are facing complex business problems that require a moral compass and more than one person to solve. Bill Gates extols that organizations must innovate or die (Lee, 2013) and it is becoming widely accepted that diversity and inclusion are key factors in cultivating the innovative workplace (Kurschner & Schmidt, 2017). Although religion has been relegated to the margins of organizational leadership studies, a new era of globalization has ushered in opportunities for spirituality to become a conduit for self-actualization and inclusive leadership. Therefore, inclusive leadership and workplace spirituality are needed to address some of these pressing matters.

This …

The "R" Factor: Perceptions Of Retirement As A Consideration In Small Business Owner Succession Planning, Debra L. Mitchell

Theses and Dissertations

This exploratory study examines the phenomenon of retirement as a factor of consideration in small business owner succession planning in the United States (U.S.). A mixed methods approach, incorporating both qualitative and quantitative analyses, was used to answer the question: In what ways do perceptions of retirement influence small business owner succession planning? Small business owners (N = 102) primarily from the upper Midwest completed a 15-item online questionnaire which asked both closed and open-ended questions related to business and business owner demographics, as well as owner perceptions of retirement. Businesses included are both family owned and non-family owned. Small …

The Kairos Model: Best Leadership Practices For Small-To-Medium Sized Management Consulting Firms, Edward Eng

Theses and Dissertations

Breakthrough technologies and ever-increasing customer demands are paving the way for new entrants to disrupt the traditional management industry. With their capacious resources, industry incumbents have mitigated these emergent forces by integrating digital capabilities into their arsenal of services. Without the capacity of market leaders, small and medium-sized business consultants are struggling to compete effectively. To fill this research gap, this study strove to develop a practical framework to help small- to medium-sized business consultants act more purposefully amidst growing competitive pressures.

The researcher chose a qualitative grounded theory design to collect data through face-to- face, semi-structured interview questions. Insights …

The Relationship Of Legal History To Mood And Substance Abuse Symptoms Among Homeless Men And Women In A Residential Recovery Program, Lily A. Mkhitarian

Theses and Dissertations

Homelessness is a devastating experience that impacts hundreds of thousands of individuals in the U.S. each day. It has been widely reported that homeless persons experience higher rates of mental disorder, substance abuse, and physical illness than domiciled individuals. Homelessness is also associated with increased risk of exposure to trauma. In addition, about a quarter of homeless individuals in the U.S. report a history of incarceration. Certainly there are multiple pathways to both homelessness and incarceration. More research is needed on the implications and consequences of having a legal history on homeless persons. The purpose of this archival study was …

Managing The Affective Responses Of Employees During Organizational Change In Higher Education, Brad Kennington

Theses and Dissertations

Higher education is facing a period of continual change driven by numerous external and internal forces. Consequently, higher education leaders are faced with the frequent and daunting task of planning and managing organizational change in higher education institutions, which are both complex and dynamic in nature. Adding difficulty to this task is the fact that employees often react to change with emotional responses that are both challenging to understand and complicated and to manage. Managing affective dimensions of change can be overwhelming to leaders, which can lead to failed organizational change efforts. This study explored and answered (a) how a …

Adoption Of The Health Information Exchange (Hie) System And The Role Of The Healthcare Leadership, Muhammad Faisal Ashfaque

Theses and Dissertations

The advancement in technology calls for improvement in service delivery in healthcare systems, especially in the present health pandemic of the COVID-19. At present, healthcare systems utilize several electronic health techniques. However, there is a need for the creation of interoperability that can assist healthcare organizations in exchanging data more effectively through the global adoption of healthcare information exchange (HIE). The current research examines the adoption of HIEs and healthcare leadership roles to realize a fully functional interoperable patient HIE. This study utilized the systematic document analysis method to review qualitative data on the different aspects of healthcare leadership, implementation …

Treatment Of Infidelity As A Clinical Issue In Couple Therapy: A Critical Review Of The Literature, Wilhelmina Emma Stamps

Theses and Dissertations

Infidelity is perhaps the most challenging issue confronting couple therapists and has a high prevalence amongst couples in both clinical and community settings. Despite significant expansion of this field of research in recent years, there has not been a comprehensive review of the literature since 2005. Without such a review, it is problematic for clinicians and researchers to determine best practices and areas needing further inquiry. This article builds on the two most recent reviews (Allen et al., 2005; Blow & Hartnett, 2005) and provides a systematic critical review of the literature on infidelity published in the last 15 years. …

How Does Eye Movement Desensitization And Reprocessing (Emdr) Work? An Examination Of The Potential Mechanisms Of Action, Sara Forster

Theses and Dissertations

A mounting body of evidence suggests that Eye Movement Desensitization and Reprocessing therapy (EMDR) is successful in reducing the impact of posttraumatic symptoms. Although the exact mechanisms of action remain unknown, theories from the psychological to the neuroscientific continue to emerge, expand, and evolve. This study will examine four of the most prominent theories to date and weigh the evidence for and against each one. It will also review, compare, and contrast the theories, evaluate the research supporting each one, and propose the most likely explanation for EMDR's success given the state of the research. Neurobiological mechanisms and correlates as …

An Evaluation Of A Transorganizational Development Process Promoting Positive Social Change, Erin Hall

Theses and Dissertations

Humanity's largest and most complex social problems are not going to be adequately addressed by one organization working alone. This study addressed two research questions: (1) what ingredients enable successful transorganization collaboration seeking positive social change? and (2) what roles does trust play? Using a case study methodology, participants and observers were interviewed. The data was analyzed using Ainsworth and Feyerhem's diagnostic model of transorganzational systems and Vangen and Huxham's trust-building and trust-sustaining theory. The findings emphasize the interdependence of transorganizational system (TS) design components and, in particular, of trust with each of the components.

Strategies Aimed At Helping African American Male Students Succeed In United States Secondary Schools: A Metasynthesis, Chibuzo N. Azinge-Walton

Theses and Dissertations

The persistent disparity in graduation rates between Black and White male students in U.S. secondary schools (the achievement gap) despite repeated efforts to even it out, is a thorn in the flesh of educators, the country over. The elimination of this continuous disparity through viable solutions, is the focus of this study. A problem is ninety percent solved when it thoroughly understood, with its comprehension necessitating a large investment of thought, time, and resources (Einstein, 1879-1955). To fully grasp the inner pinning of the achievement gap dilemma, this researcher selected, read, and reviewed 50 subject matter-related archived articles/studies obtained from …

Books Or Food? Food Insecurity And The Rise Of Campus Food Pantries, Sonya Sharififard

Theses and Dissertations

This dissertation is a quantitative study of campus food pantries located in public four-year colleges and universities in the United States. The research aims to explain relationships among campus food pantries and surrounding neighborhood characteristics affecting local food environments. There are two parts to the study: (a) the quantitative analysis through responses from a participant questionnaire; and (b) a case study analysis to accompany the quantitative analysis. The researcher identified three metropolitan counties within U.S. census tracts, to determine the relationship between neighborhood demographics, the local food environment, and the impact on campus communities. The researcher explored food accessibility within …

Assessing The Impacts Of Work-Related Applications Of Improvisation Training On Psychological Safety In Teams, Marne Maykowskyj Nordean

Theses and Dissertations

This paper discusses improvisational training (IMPT) and psychological safety and seeks to find if the former impacts the latter. For this study, improvisation has four main tenets: ensemble / co-creating, 'yes, and' / accept and heighten, authenticity / celebrating failure, and listening and communication skills. Psychological safety is defined as the shared belief held by members of a team that the team is safe for interpersonal risk-taking and a sense of confidence that the team will not embarrass, reject or punish someone for speaking up. This confidence stems from mutual respect and trust among team members. It is described as …

A Quantitative Descriptive Study Of The Self-Perception Of Southern Oregon Entrepreneurial Leaders, Rebecca Williams

Theses and Dissertations

The study helped to identify what are the leadership styles of adult entrepreneurs, and what if any factors contribute to an entrepreneurs' leadership style. The study focused on entrepreneurial leaders, over the age of 18, who own and started their own business. These entrepreneurs are a member of one of the following Southern Oregon-based business networking groups: Southern Oregon Regional Economic Development, Inc. (SOREDI), and the Small Business Development Center (SBDC) of Southern Oregon. The study explored the self-perceived leadership styles of entrepreneurs in Southern Oregon through a quantitative descriptive survey method that utilized a 45-question, Likert scale from the …

Interaction, Collaboration And Content Creation In Informal Online Learning Environments: Multidimensional Analyses Of Longitudinal Data From The Scratch Coding Community, Seung B. Lee

Theses and Dissertations

Despite rising levels of participation by children and adolescents in large, informal online learning communities, there has been limited research examining the role that social dynamics play on the online behavior of young users. In this context, this mixed-methods longitudinal study aimed to investigate the relationship between interaction, collaboration and content creation through the analysis of user-generated comments and log-data from the Scratch platform. The research focused on more than 45,000 comments associated with the online activity of 200 randomly selected participants over a period of three months in early 2012. A combination of methodological techniques was applied in the …

Leading, Coaching, & Mentoring: A Study Of Coach-Athlete Relationships As Associated Factors In Performance, Katie D. Kamachi

Theses and Dissertations

This research focused on global leadership and change and competitive athletics. Servant leadership, including the five servant leadership variables; altruistic calling, emotional healing, wisdom, persuasive mapping, and organizational stewardship, as well coach athlete relationships, including the three coach-athlete relationship variables; closeness, commitment, and complementarity, were used to analyze athlete perceptions. This study then found correlations of the associated factors to outcome, at team and individual levels. Findings from this study include recognizing the commitment of the head coach as a factor in team mins; individual athlete perception of closeness as related to games started; the emotional healing aspects from the …

Development Of A Strengths And Empowerment Focused Group Intervention For Marginalized Populations With A Focus On Women, Low-Income, And Racial-Ethnic Minorities, Kristin Goradietsky

Theses and Dissertations

Members of marginalized groups face numerous stressors, including racism, discrimination, and a lack of access to quality mental health and medical care. Members of marginalized groups are also at a higher risk of developing mental health issues such as posttraumatic stress disorder, depression, and anxiety. There is a lack of literature regarding effective mental health treatment for members of marginalized groups, including those who are homeless or low income; Black, indigenous, and people of color (BIPOC); and women. A literature review indicated interventions based in empowerment, positive psychology, mindfulness, and critical consciousness may be particularly applicable to vulnerable populations. Therefore, …