Digital Commons Network^™

Macroscale Robust Superlubricity On Metallic Nbb2, Jia Wang, Chang Liu, Kaifei Miao, Kan Zhang, Weitao Zheng, Changfeng Chen

Physics & Astronomy Faculty Research

Robust superlubricity (RSL), defined by concurrent superlow friction and wear, holds great promise for reducing material and energy loss in vast industrial and technological operations. Despite recent advances, challenges remain in finding materials that exhibit RSL on macrolength and time scales and possess vigorous electrical conduction ability. Here, the discovery of RSL is reported on hydrated NbB2 films that exhibit vanishingly small coefficient of friction (0.001–0.006) and superlow wear rate (≈10−17 m3 N−1 m−1) on large length scales reaching millimeter range and prolonged time scales lasting through extensive loading durations. Moreover, the measured low resistivity (≈10−6 Ω m) of the …

Spatial Deconcentration Of Tourism Concentrations: A Visitors’ Galaxy Impact Model Of The Covid-19 Crisis, Jaewon Lim, Karima Kourtit, Peter Nijkamp, Christopher Stream

Public Policy and Leadership Faculty Research

This paper analyzes the impact of COVID-19 on mass tourism concentrations, such as Las Vegas. It argues that health risks and perceptions may induce a more deconcentrated pattern of mass tourism, with more geographical dispersion to rural and natural areas. The analytical framework is modeled and applied to extensive data on Las Vegas tourism. The proposition on deconcentrated tourism concentrations is confirmed. Pre-pandemic outer-inner city complementary relations between “Outdoor Activities” in 11 surrounding national parks and the “Gaming Industry” in Las Vegas have transformed into outer-inner city substitution relations in the COVID-19 pandemic. This represents the evolving deconcentration of tourism …

Prioritizing Nurturing Care At The Municipal And District Level With The Brazilian Early Childhood Friendly Municipal Index (Imapi), Gabriela Buccini, Juliana L. Pimentel, Jéssica Pedroso, Stefanie Dos Anjos Coelho Kubo, Juracy Bertoldo, Alberto Sironi, Marcos E. Barreto, Rafael Perez-Escamilla, Muriel B. Gubert

Social and Behavioral Health Faculty Research

The Brazilian Early Childhood Friendly Municipal Index (IMAPI) is a population-based approach to monitor the nurturing care environment for early childhood development (ECD) using routine information system data. It is unknown whether IMAPI can be applied to document metropolitan urban territorial differences in nurturing care environments. We used Brasilia, Brazil's capital with a large metropolitan population of 2,881,854 inhabitants divided into 31 districts, as a case study to examine whether disaggregation of nurturing care data can inform a more equitable prioritization for ECD in metropolitan areas. IMAPI scores were estimated at the municipal level (IMAPI-M, 31 indicators) and at the …

Gingival Transcriptome Of Innate Antimicrobial Factors And The Oral Microbiome With Aging And Periodontitis, Jeffrey L. Ebersole, Sreenatha Kirakodu, Linh Nguyen, Octavio A. Gonzalez

Dental Medicine Faculty Research

The epithelial barrier at mucosal sites comprises an important mechanical protective feature of innate immunity, and is intimately involved in communicating signals of infection/tissue damage to inflammatory and immune cells in these local environments. A wide array of antimicrobial factors (AMF) exist at mucosal sites and in secretions that contribute to this innate immunity. A non-human primate model of ligature-induced periodontitis was used to explore characteristics of the antimicrobial factor transcriptome (n = 114 genes) of gingival biopsies in health, initiation and progression of periodontal lesions, and in samples with clinical resolution. Age effects and relationship of AMF to the …

A Qualitative Analysis Of The Impact Of Electronic Health Records (Ehr) On Healthcare Quality And Safety: Clinicians’ Lived Experiences, Soumya Upadhyay, Han-Fen Hu

Healthcare Administration and Policy Faculty Research

Purpose: There have been mixed findings of clinicians’ perceptions of Electronic Health Record (EHR). This study aims to explore the lived experiences of clinicians, to assess the role of EHR in improving the quality and safety of healthcare.

Basic Procedures: A qualitative study design was used. We collected the opinions from different groups of clinicians (physicians, hospitalists, nurse practitioners, nurses, and patient safety officers) using semi-structured interviews. Organizations represented were trauma hospitals, academic medical centers, medical clinics, home health centers, and small hospitals.

Main findings: Our study found clinicians’ ambivalent assessments toward EHR, which confirms extant literature. …

Misalignment Of Terrestrial Circumbinary Planets As An Indicator Of Their Formation Mechanism, Anna C. Childs, Rebecca G. Martin

Physics & Astronomy Faculty Research

Circumbinary gas disks are often observed to be misaligned with the binary orbit, suggesting that planet formation may proceed in a misaligned disk. With n-body simulations, we consider the formation of circumbinary terrestrial planets from a particle disk that is initially misaligned. We find that if terrestrial planets form in this way, in the absence of gas, they can only form close to coplanar or close to polar to the binary orbit. Planets around a circular binary form coplanar while planets around an eccentric binary can form coplanar or polar depending on the initial disk misalignment and the binary eccentricity. …

Cellular Dna Effects Of Radiation And Cancer Risk Assessment In Cells With Mitochondrial Defects, J. Chen, D. M. Sridharan, C. L. Cross, J. M. Pluth

Epidemiology & Biostatistics Faculty Research

Mitochondria play a key role in mediating non-targeted effects (NTE) post-radiation exposure. Mitochondrial DNA (mtDNA), due to its less efficient repair as compared to nuclear DNA, is more severely affected by radiation exposure and mutations in essential mtDNA genes can further exacerbate oxidative stress. Our objective was to evaluate the impact of mitochondrial defects on radiation-induced DDR and genomic instability, biomarkers that can foreshadow cancer development. To better understand this relationship, we used commercially available lymphoblastoid cell lines containing characterized mitochondrial mutations and studied the kinetics of DNA damage and relative telomere length (RTL) changes over time post 0.5 Gy …

Evaluating Long-Term Outcomes Of A High School-Based Impaired And Distracted Driving Prevention Program, Lindsay Buczek, Laura K. Gryder, Samantha Slinkard-Barnum, Kavita Batra, Cassandra Trummel, Allison G. Mcnickle, Douglas R. Fraser, Deborah A. Kuhls, Paul J. Chestovich

School of Medicine Faculty Research

Motor vehicle crashes are one of the leading causes of death among teenagers. Many of these deaths are due to preventable causes, including impaired and distracted driving. You Drink, You Drive, You Lose (YDYDYL) is a prevention program to educate high school students about the consequences of impaired and distracted driving. YDYDYL was conducted at a public high school in Southern Nevada in March 2020. A secondary data analysis was conducted to compare knowledge and attitudes of previous participants with first-time participants. Independent-samples-t test and χ2 test/Fisher’s exact test with post-contingency analysis were used to compare pre-event responses between students …

Monitoring Nurturing Care Environments For Early Childhood From The National To The Municipal Level, Rafael Pérez‐Escamilla, Sonia Venancio, Gabirela Buccini

Social and Behavioral Health Faculty Research

There is a dearth of indicators and management information systems to assess early childhood nurturing care environments. The Brazilian Early Childhood Care Friendly Municipal Index (IMAPI) is a robust tool to assess nurturing care environments at the local level. IMAPI was able to detect nurturing care inequities within and across regions. Further validation work is needed to confirm the utility of IMAPI for policymaking.

Implicit Bias Against Bipoc Patients In Clinical Settings: A Qualitative Review, Raisa Kabir, Sayeda Tazim Zaidi

Spectra Undergraduate Research Journal

Black, Indigenous, and People of Color (BIPOC) from stigmatized and marginalized communities face implicit bias in medicine. Implicit biases are unconscious attitudes and internalized discrimination developed through repeated practices based on stereotypes from a foundation of systematic racism. In clinical settings, it impacts individuals’ healthcare experience and treatment outcomes. This study aimed to characterize and address implicit bias among healthcare providers toward BIPOC patients in clinical settings. A literature search in MEDLINE/PubMed, CINAHL, PsyArticles, PsycINFO from EBSCO databases was conducted to include all peer-reviewed studies (2012-2021) about implicit bias toward BIPOC. Most healthcare providers have some form of implicit bias-positive …

Senior Hunger In The Mountain West, 2019, Ally M. Beckwith, Caitlin J. Saladino, William E. Brown Jr.

Health

This fact sheet highlights data on senior hunger in the Mountain West region in 2019 as originally reported in Feeding America’s The State of Senior Hunger annual series. This report focuses on the extent of food insecurity among seniors in the United States. Seniors are defined as those who are 60 years of age or older.

The State Of Mental Health In The Mountain West, Olivia K. Cheche, Kristian Thymianos, Katie M. Gilbertson, Kelliann Beavers, Caitlin J. Saladino, William E. Brown Jr.

Health

This fact sheet explores mental health rankings of Mountain West states from Mental Health America’s (MHA) 2022 report, The State of Mental Health in America. This study offers a snapshot of U.S. mental health based on data across all 50 states and the District of Columbia. MHA is the nation’s leading community based mental health nonprofit, founded in 1909, and “dedicated to addressing the needs of those living with mental illness and promoting the overall mental health of all.” This report is a companion to MHA’s interactive data available through its website.

Social Justice Leadership: Coming To Know Another Possibility Through Autoethnography, Jacob D. Skousen

Educational Psychology, Leadership, and Higher Education Faculty Research

Traditional notions of learning, teaching, schooling, and leading, contribute to the inequity and injustice found in schools. In this study, autoethnography was used as a process and product to explore one leader’s journey opening and leading a new “alternative” school as the school’s principal. These experiences create the backdrop of a larger narrative about public schooling and leadership. The findings, expressed through narrative, demonstrate that schools do not have to beget oppression, and school practices, framed in social justice, can create the needed environment and culture to develop liberatory praxis.

P2p Accommodation Motivators And Repurchase Intention: A Comparison Of Indirect And Total Effects Before And During The Covid-19 Pandemic, Cass Shum, Billy Bai, Mehmet Erdem

Hospitality Faculty Research

Despite increased research attention on guests’ motivators to use peer-to-peer (P2P) accommodation, such as Airbnb, it remains unclear which motivators have the strongest effect on repurchase intention; and how the COVID-19 pandemic changes the effects of motivators. By conducting two U.S.-based studies before and during the COVID-19 pandemic, this study tested and compared the indirect and total effects of 13 motivators on repurchase intention on the P2P accommodation platforms via satisfaction. Functional motivators increased repurchase intention via satisfaction before and during the pandemic. Neighborhood – a location-based functional motivator – consistently had the strongest total effects on repurchase intention. COVID-anxiety …

Patient Digital Health Technologies To Support Primary Care Across Clinical Contexts: Survey Of Primary Care Providers, Behavioral Health Consultants, And Nurses, Oleg Zaslavsky, Frances Chu, Brenna N. Renn

Psychology Faculty Research

Background: The acceptance of digital health technologies to support patient care for various clinical conditions among primary care providers and staff has not been explored. Objective: The purpose of this study was to explore the extent of potential differences between major groups of providers and staff in primary care, including behavioral health consultants (BHCs; eg, psychologists, social workers, and counselors), primary care providers (PCPs; eg, physicians and nurse practitioners), and nurses (registered nurses and licensed practical nurses) in the acceptance of various health technologies (ie, mobile apps, wearables, live video, phone, email, instant chats, text messages, social media, and patient …

Trends And Age-Related Characteristics Of Substance Use In The Hospitalized Homeless Population, Sung-Youn Chun, Ji W. Yoo, Hyeki Park, Jinwook Hwang, Pearl C. Kim, Seong Park, Jay J. Shen

School of Medicine Faculty Research

We aimed to examine trends and characteristics of substance use (opioid, cocaine, marijuana, and heroin) among hospitalized homeless patients in comparison with other hospitalized patients in 3 states. This was a cross-sectional study, based on the 2007 to 2015 State Inpatient Data of Arizona, Florida, and Washington (n= 32,162,939). Use of opioid, cocaine, marijuana, heroin, respectively, was identified by the International Classification of Diseases, 9th Revision. Multi-level multivariable regressions were performed to estimate relative risk (RR) and 95% confidence intervals (CI). Dependent variables were the use of substances (opioid, cocaine, marijuana, and heroin), respectively. The main independent variable was homeless …

Changing The Rules: Institutions, Party Systems, And The Frequency Of Constitutional Amendments In Africa, Christian B. Jensen, Michelle Kuenzi, Jonathan-Georges Mehanna

Political Science Faculty Research

What factors influence constitutional stability in the emerging democracies of Sub-Saharan Africa? This is an important question that has never been addressed in a systematic cross-national study of Africa's emerging democracies. Using the Comparative Constitutions Project dataset and our own original dataset for veto players and party systems, we examine the influence of veto players and party system characteristics on the frequency of constitutional amendments in the electoral periods between 1990 and 2020 in forty-one African countries. Our results provide broad support for the veto players theory. More specifically, we find that as the number of actors needed to approve …

Not Only Severe Events: Moderate Dry Periods Impact The Hydraulic Functioning And Survival Of Planted Ponderosa Pine Seedlings, Carolyn R. Koehn, Matthew D. Petrie, Robert M. Hubbard

Life Sciences Faculty Research

Juvenile tree survival will increasingly shape the persistence of ponderosa pine forests in the western United States. In contrast to severe pulse disturbances that induce widespread adult and juvenile tree mortality, moderate periods of low rainfall and warm temperatures may reduce forest persistence by killing juvenile trees at the seedling stage. Intensification of these periods in a changing climate could therefore increasingly restrict both natural regeneration and artificial regeneration of planted seedlings. We conducted a controlled field experiment at a single site in the Front Range of Colorado, USA, to determine the responses and survival of 3 Colorado subpopulations of < 1 year old potted ponderosa pines to moderately dry conditions, variation in small rainfall events based on observed patterns, and shaded and unshaded microsite environments. Near surface soil moisture increased slightly following small rainfall events, but declined over the 45-day experimental period. Seedling transpiration and associated canopy cooling declined after ∼13 days, and further declines in transpiration and canopy cooling suggest that the majority of trees in lower rainfall treatments experienced hydraulic dysfunction between days ∼20–30. After 45 days, mortality across all subpopulations and treatments, inferred by relative water loss, exceeded 90–95%. Despite some uncertainty pertaining to the stress tolerance of nursery grown versus naturally germinated conifers, our results show that planted ponderosa pine seedlings < 1 year old are unlikely to survive moderate dry periods of 20+ days relying on small rainfall events. Although microsite conditions and soil moisture availability shaped tree hydraulic functioning early in the experiment (days 1–13), later functioning was shaped predominately by the legacy of rainfall treatments. Our results illustrate the importance of moderate dry events that occur consistently as part of seasonal variation in climate, and show how their intensification may constitute a sustained press that limits opportunities for natural and artificial regeneration.

Association Between Shift Rotation And 30-Year Framingham Risk Of Cardiovascular Disease Among Male Workers In A Medium-Sized Manufacturing Factory, An-Yi Hung, Lung-Chang Chien, Ro-Ting Lin

Epidemiology & Biostatistics Faculty Research

Rotating shift work is associated with an increased risk of cardiovascular disease (CVD). This study compared the CVD risk score in 129 male line workers aged 22–49 years on different shifts in a medium-sized metal production factory from 2017 to 2020. We classified workers into four groups: permanent day shift, weekly rotation involving five consecutive nights, weekly rotation involving 3–4 consecutive nights, and monthly rotation involving two consecutive nights. We used the Framingham Risk Score to estimate the 30-yr risks of general and hard CVD (CVD risk estimates). We investigated the differences in CVD risk estimates between different groups using …

Unlv Top Tier Focus: Community Partnerships, University Of Nevada, Las Vegas

Focus on Top Tier 2.0

Community Partnerships seeks to leverage our resources for public good to advance the university and the communities we serve through developing strong partnerships that are mutually beneficial, promoting the value of the university, and enriching the intellectual and cultural vitality of the valley.

Healthy Ageing And Intellectual Disability Study: Summary Of Findings And The Protocol For The 10-Year Follow-Up Study, Marleen J. De Leeuw, Alyt Oppewal, Roy G. Elbers, Mireille W. E. J. Knulst, Marco C. Van Maurik, Marjoleine C. Van Bruggen, Thessa I.M. Hilgenkamp, Patrick J.E. Bindels, Dederike A.M. Maes-Festen

Physical Therapy Faculty Research

Introduction The Healthy Ageing and Intellectual Disability (HA-ID) study is a prospective multicentre cohort study in the Netherlands that started in 2008, including 1050 older adults (aged ≥50) with intellectual disabilities (ID). The study is designed to learn more about the health and health risks of this group as they age. Compared with the amount of research in the general population, epidemiological research into the health of older adults with ID is still in its infancy. Longitudinal data about the health of this vulnerable and relatively unhealthy group are needed so that policy and care can be prioritised and for …

The Effects Of Nuclear Factor Erythroid 2 (Nfe2)-Related Factor 2 (Nrf2) Activation In Preclinical Models Of Peripheral Neuropathic Pain, Paramita Basu, Dayna L. Averitt, Camelia Maier, Arpita Basu

Kinesiology and Nutrition Sciences Faculty Research

Oxidative stress, resulting from an imbalance between the formation of damaging free radicals and availability of protective antioxidants, can contribute to peripheral neuropathic pain conditions. Reactive oxygen and nitrogen species, as well as products of the mitochondrial metabolism such as superoxide anions, hydrogen peroxide, and hydroxyl radicals, are common free radicals. Nuclear factor erythroid 2 (NFE2)-related factor 2 (Nrf2) is a transcription factor encoded by the NFE2L2 gene and is a member of the cap ‘n’ collar subfamily of basic region leucine zipper transcription factors. Under normal physiological conditions, Nrf2 remains bound to Kelch-like ECH-associated protein 1 in the cytoplasm …

Asteroids And Life: How Special Is The Solar System?, Rebecca G. Martin, Mario Livio

Physics & Astronomy Faculty Research

Asteroid impacts with Earth may have played an essential role in the emergence of life on Earth through their creation of favorable niches for life, changes to the atmosphere, and delivery of water. Consequently, we suggest two potential requirements for life in an exoplanetary system: first, that the system has an asteroid belt, and second, that there is a mechanism to drive asteroids to impact the terrestrial habitable planet. Since in the solar system the ν6 secular resonance has been shown to have been important in driving these impacts, we explore how the masses and locations of two giant planets …

A Theoretical Framework For Addressing Fear Of Falling Avoidance Behavior In Parkinson’S Disease, Merrill R. Landers, Maria H. Nilsson

Physical Therapy Faculty Research

Postural instability in Parkinson’s disease (PD) is associated with several downstream consequences that ultimately lead to a greater risk of falling. Among the prominent downstream consequences is fear of falling (FOF), which is both common and problematic in PD. It can lead to a vicious cycle of FOF avoidance behavior that results in more sedentary behavior, physical deconditioning, and weakening of already impaired balance systems. This, in turn, may make the person with PD more susceptible to a future fall even with benign daily tasks. While FOF activity avoidance can be adaptive (appropriate), it can also be maladaptive (inappropriate or …

Understanding The Effects Of Environment, Social, And Governance Conduct On Financial Performance: Arguments For A Process And Integrated Modelling Approach, Michael T. Lee, Ikseon Suh

Department of Accounting Faculty Research

To date, an overwhelming number of research findings on Environment, Social, and Governance (ESG) conduct and financial performance remains inconclusive. Furthermore, research has not identified nor explained the “underlying mechanisms” behind this relationship. To encourage future research, we discuss the mechanisms by identifying the first-order, mediating, and moderating variables. We synthesize recent studies for emerging themes and implications; argue for a process and integrated approach for modelling causality between ESG conduct and financial performance variables; and suggest methods to analyze the models. We also advocate for researchers to explore the idea that balancing corporate conduct among the E, S, and …

The Antarctic Weddell Seal Genome Reveals Evidence Of Selection On Cardiovascular Phenotype And Lipid Handling, Hyun Ji Noh, Jason Turner-Maier, S. Anne Schulberg, Michael L. Fitzgerald, Jeremy Johnson, Kaitlin N. Allen, Luis A. Huckstadt, Annabelle J. Batten, Jessica Alfoldi, Daniel P. Costa, Elinor K. Karlsson, Warren M. Zapol, Emmanuel S. Buys, Kerstin Lindbald-Toh, Allyson G. Hindle

Life Sciences Faculty Research

The Weddell seal (Leptonychotes weddellii) thrives in its extreme Antarctic environment. We generated the Weddell seal genome assembly and a high-quality annotation to investigate genome-wide evolutionary pressures that underlie its phenotype and to study genes implicated in hypoxia tolerance and a lipid-based metabolism. Genome-wide analyses included gene family expansion/contraction, positive selection, and diverged sequence (acceleration) compared to other placental mammals, identifying selection in coding and non-coding sequence in five pathways that may shape cardiovascular phenotype. Lipid metabolism as well as hypoxia genes contained more accelerated regions in the Weddell seal compared to genomic background. Top-significant genes were SUMO2 and EP300; …

2014-2019 National Science Foundation (Nsf) Rankings By Total R&D Expenditures, Katie M. Gilbertson, Caitlin J. Saladino, William E. Brown Jr.

Higher Education

This fact sheet presents National Science Foundation (NSF) funding data for 10 individual research universities in addition to the combined funding received by the University of Nevada, Las Vegas (UNLV) and the University of Nevada, Reno (UNR) for the years 2014 to 2019.

Explaining Correlates Of Cervical Cancer Screening Among Minority Women In The United States, Manoj Sharma, Kavita Batra, Christopher Johansen, Siddharth Raich

Social and Behavioral Health Faculty Research

Globally, cervical cancer is the fourth leading cause of death among women. While overall cervical cancer rates have decreased over the last few decades, minority women continue to be disproportionately affected compared to White women. Given the paucity of theory-based interventions to promote Pap smear tests among minority women, this cross-sectional study attempts to examine the correlates of cervical cancer screening by Pap test using the Multi-theory Model (MTM) as a theoretical paradigm among minority women in the United States (U.S.). Structural Equation Modelling (SEM) was done for testing the construct validity of the survey instrument. Data were analyzed through …

Covid-19 Vaccination Rates In Nevada Counties, December 2021, Kristian Thymianos, Olivia K. Cheche, William E. Brown Jr., Caitlin J. Saladino

Health

This fact sheet presents vaccination rates in Nevada counties as originally reported by the Data Strategy and Execution Workgroup in the Joint Coordination Cell, under the White House COVID-19 Team in the December 30th “COVID-19 Community Profile Report.” Data on one-dose and full vaccination rates are presented.

Assessment Of Quality Of Fresh Concrete Delivered At Varying Temperatures, Maroua Saidi, Kazem Jadidi, Moses Karakouzian

Civil and Environmental Engineering and Construction Faculty Research

Concrete is increasingly utilized in the construction field in Southern Nevada. This area has an arid and hot summer and freezing cold winter conditions. These extreme conditions affect the properties of fresh concrete, which can cause cracking. Hot weather conditions may adversely affect both fresh and hardened concrete properties. Even though practices can minimize the detrimental effects, good quality control of fresh concrete, from mixing to finishing, is crucial under hot weather conditions. The objective of the present study is to evaluate the seasonal consistency of concrete quality, considering strength and slump properties. Another objective of this research is to …