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The Importance Of The Study Of Igneous Rocks And Compositions To Constrain The Martian Planetary Evolution, Arya Udry University Of Nevada, Las Vegas, Justin Filiberto, Juliane Gross, Mariek Schmidt, Deanne Rogers, Libby Hausrath, Roger Wiens, Nina Lanza Mar 2021

The Importance Of The Study Of Igneous Rocks And Compositions To Constrain The Martian Planetary Evolution, Arya Udry University Of Nevada, Las Vegas, Justin Filiberto, Juliane Gross, Mariek Schmidt, Deanne Rogers, Libby Hausrath, Roger Wiens, Nina Lanza

Geoscience Faculty Research

This white paper summarizes the scientific importance of studying igneous compositions in meteorites, surface samples, and through orbital analyses to better constrain the geology of Mars as a whole and better understand the geological processes that have shaped Mars in the past and present.

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Poly(Pyridinium Salt)S Containing 2,7-Diamino-9,9'-Dioctylfluorene Moieties With Various Organic Counterions Exhibiting Both Lyotropic Liquid-Crystalline And Light-Emitting Properties, Pradip K. Bhowmik, Tae S. Jo, Jung J. Koh, Jongwon Park, Bidyut Biswas, Ronald Carlo G. Principe, Haesook Han, András F. Wacha, Matti Knaapila Mar 2021

Poly(Pyridinium Salt)S Containing 2,7-Diamino-9,9'-Dioctylfluorene Moieties With Various Organic Counterions Exhibiting Both Lyotropic Liquid-Crystalline And Light-Emitting Properties, Pradip K. Bhowmik, Tae S. Jo, Jung J. Koh, Jongwon Park, Bidyut Biswas, Ronald Carlo G. Principe, Haesook Han, András F. Wacha, Matti Knaapila

Chemistry and Biochemistry Faculty Research

A series of poly(pyridinium salt)s-fluorene main-chain ionic polymers with various organic counterions were synthesized by using ring-transmutation polymerization and metathesis reactions. Their chemical structures were characterized by Fourier Transform Infrared (FTIR), proton (1H), and fluorine 19 (19F) nuclear magnetic resonance (NMR) spectrometers. These polymers showed a number-average molecular weight (Mns) between 96.5 and 107.8 kg/mol and polydispersity index (PDI) in the range of 1.12-1.88. They exhibited fully-grown lyotropic phases in polar protic and aprotic solvents at different critical concentrations. Small-angle X-ray scattering for one polymer example indicates lyotropic structure formation for 60-80% solvent fraction. A lyotropic smectic phase contains 10 …

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Mechanical Characteristics Of Cement Paste In The Presence Of Carbon Nanotubes And Silica Oxide Nanoparticles: An Experimental Study, Moses Karakouzian, Visar Farhangi, Marzieh Ramezani Farani, Alireza Joshaghani, Mehdi Zadehmohamad, Mohammad Ahmadzadeh Mar 2021

Mechanical Characteristics Of Cement Paste In The Presence Of Carbon Nanotubes And Silica Oxide Nanoparticles: An Experimental Study, Moses Karakouzian, Visar Farhangi, Marzieh Ramezani Farani, Alireza Joshaghani, Mehdi Zadehmohamad, Mohammad Ahmadzadeh

Civil and Environmental Engineering and Construction Faculty Research

Considering the remarkable characteristics of nanomaterials, previous research studies investigated the effects of incorporating different types of these materials on improving the concrete properties. However, further studies are required to evaluate the complementary hybridization and synergistic influence of nanomaterials. In this research, the combined effect of adding nano silica particles (NS) and multi-walled carbon nanotubes (MWCNT) on enhancing both the compressive and flexural strengths of the cement paste was investigated. Moreover, the morphology of the interface between cement paste and aggregates was studied by scanning electron microscopy (SEM). The mixtures were prepared using three different portions of MWCNT and NS. …

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Growing Biodiverse Urban Futures: Renaturalization And Rewilding As Strategies To Strengthen Urban Resilience, Steffen Lehmann Mar 2021

Growing Biodiverse Urban Futures: Renaturalization And Rewilding As Strategies To Strengthen Urban Resilience, Steffen Lehmann

Architecture Faculty Research

How are our cities using nature-based solutions to confront the challenges posed by a warming climate, the loss of biodiversity and major resource depletion? This article discusses the opportunities and benefits of applying the concepts of regreening and rewilding of cities. The article engages with key sources and summarizes the background and development of regreening and nature-based solutions and important policies, concerns and perspectives of international and national organizations. It introduces the integration of nature-based solutions (NBS) as a strategy in urban planning with the aim to strengthen urban resilience and to slow down the biodiversity decline. Rewilding areas in …

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Implications Of An Improved Water Equation Of State For Water-Rich Planets, Chenling Huang, David R. Rice, Zachary M. Grande, Dean Smith, John H. Boisvert, Oliver Tschauner, Ashkan Salamat, Jason Steffen Mar 2021

Implications Of An Improved Water Equation Of State For Water-Rich Planets, Chenling Huang, David R. Rice, Zachary M. Grande, Dean Smith, John H. Boisvert, Oliver Tschauner, Ashkan Salamat, Jason Steffen

Geoscience Faculty Research

Water (H2O), in all forms, is an important constituent in planetary bodies, controlling habitability and influencing geological activity. Under conditions found in the interior of many planets, as the pressure increases, the H-bonds in water gradually weaken and are replaced by ionic bonds. Recent experimental measurements of the water equation of state (EOS) showed both a new phase of H-bonded water ice, ice-VIIt, and a relatively low transition pressure just above 30 GPa to ionic bonded ice-X, which has a bulk modulus 2.5 times larger. The higher bulk modulus of ice-X produces larger planets for a given mass, thereby either …

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Non-Adiabatic Quantum Interference In The Ultracold Li + Lina → Li2+ Na Reaction, Brian K. Kendrick, Hui Li, Ming Li, Svetlana Kotochigova, James F.E. Croft, Naduvalath Balakrishnan Mar 2021

Non-Adiabatic Quantum Interference In The Ultracold Li + Lina → Li2+ Na Reaction, Brian K. Kendrick, Hui Li, Ming Li, Svetlana Kotochigova, James F.E. Croft, Naduvalath Balakrishnan

Chemistry and Biochemistry Faculty Research

Electronically non-adiabatic effects play an important role in many chemical reactions. However, how these effects manifest in cold and ultracold chemistry remains largely unexplored. Here for the first time we present from first principles the non-adiabatic quantum dynamics of the reactive scattering between ultracold alkali-metal LiNa molecules and Li atoms. We show that non-adiabatic dynamics induces quantum interference effects that dramatically alter the ultracold rotationally resolved reaction rate coefficients. The interference effect arises from the conical intersection between the ground and an excited electronic state that is energetically accessible even for ultracold collisions. These unique interference effects might be exploited …

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Marker Placement Reliability And Objectivity For Biomechanical Cohort Study: Healthy Aging In Industrial Environment (Haie—Program 4), Jan Malus, Jiri Skypala, Julia Freedman Silvernail, Jaroslav Uchytil, Joseph Hamill, Tomas Barot, Daniel Jandacka Mar 2021

Marker Placement Reliability And Objectivity For Biomechanical Cohort Study: Healthy Aging In Industrial Environment (Haie—Program 4), Jan Malus, Jiri Skypala, Julia Freedman Silvernail, Jaroslav Uchytil, Joseph Hamill, Tomas Barot, Daniel Jandacka

Kinesiology and Nutrition Sciences Faculty Research

In large cohort studies, due to the time-consuming nature of the measurement of movement biomechanics, more than one evaluator needs to be involved. This may increase the potential occurrence of error due to inaccurate positioning of markers to the anatomical locations. The pur-pose of this study was to determine the reliability and objectivity of lower limb segments length by multiple evaluators in a large cohort study concerning healthy aging in an industrial environment. A total of eight evaluators performed marker placements on five participants on three different days. Evaluators placed markers bilaterally on specific anatomical locations of the pelvis, thigh, …

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Crafts For Fast Radio Bursts: Extending The Dispersion-Fluence Relation With New Frbs Detected By Fast, Chen Hui Niu, Di Li, Rui Luo, Wei Yang Wang, Jumei Yao, Bing Zhang, Wei Wei Zhu, Pei Wang, Haoyang Ye, Yong Kun Zhang, Jia Rui Niu, Ning Yu Tang, Ran Duan, Marko Krco, Shi Dai, Yi Feng, Chenchen Miao, Zhichen Pan, Lei Qian, Mengyao Xue, Mao Yuan, Youling Yue, Lei Zhang, Xinxin Zhang Mar 2021

Crafts For Fast Radio Bursts: Extending The Dispersion-Fluence Relation With New Frbs Detected By Fast, Chen Hui Niu, Di Li, Rui Luo, Wei Yang Wang, Jumei Yao, Bing Zhang, Wei Wei Zhu, Pei Wang, Haoyang Ye, Yong Kun Zhang, Jia Rui Niu, Ning Yu Tang, Ran Duan, Marko Krco, Shi Dai, Yi Feng, Chenchen Miao, Zhichen Pan, Lei Qian, Mengyao Xue, Mao Yuan, Youling Yue, Lei Zhang, Xinxin Zhang

Physics & Astronomy Faculty Research

We report three new FRBs discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), namely FRB 181017.J0036+11, FRB 181118, and FRB 181130, through the Commensal Radio Astronomy FAST Survey (CRAFTS). Together with FRB 181123, which was reported earlier, all four FAST-discovered FRBs share the same characteristics of low fluence (≤0.2 Jy ms) and high dispersion measure (DM, >1000 pc cm-3), consistent with the anticorrelation between DM and fluence of the entire FRB population. FRB 181118 and FRB 181130 exhibit band-limited features. FRB 181130 is prominently scattered (τ s ≃ 8 ms) at 1.25 GHz. FRB 181017.J0036+11 has full-bandwidth emission with …

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Prediction Of Obstructive Sleep Apnea Using Fast Fourier Transform Of Overnight Breath Recordings, Nicole L. Molin, Clifford Molin, Rohan J. Dalpatadu, Ashok K. Singh Mar 2021

Prediction Of Obstructive Sleep Apnea Using Fast Fourier Transform Of Overnight Breath Recordings, Nicole L. Molin, Clifford Molin, Rohan J. Dalpatadu, Ashok K. Singh

Mathematical Sciences Faculty Research

The objective of this study is to address the problem of predicting the risk of obstructive sleep apnea (OSA) from overnight breath recordings collected by a subject using a smartphone or an iPhone. The dataset used in this study was collected at a health care facility and consists of breathing amplitudes of 42 subjects using the smart phone App ZeeAppnea. A total of four data mining multi-level classifiers are used on the Fast Fourier Transform (FFT) of each time series, and prediction accuracies are computed. The Random Forest (RF) and the Support Vector Machine (SVM) classifiers yielded the best results, …

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Renewable Energy Generation And Ghg Emission Reduction Potential Of A Satellitewater Reuse Plant By Using Solar Photovoltaics And Anaerobic Digestion, Jonathan R. Bailey, Saria Bukhary, Jacimaria R. Batista, Sajjad Ahmad Feb 2021

Renewable Energy Generation And Ghg Emission Reduction Potential Of A Satellitewater Reuse Plant By Using Solar Photovoltaics And Anaerobic Digestion, Jonathan R. Bailey, Saria Bukhary, Jacimaria R. Batista, Sajjad Ahmad

Civil and Environmental Engineering and Construction Faculty Research

Wastewater treatment is a very energy-intensive process. The growing population, increased demands for energy and water, and rising pollution levels caused by fossil-fuel-based energy generation, warrants the transition from fossil fuels to renewable energy. This research explored the energy consumption offset of a satellite water reuse plant (WRP) by using solar photovoltaics (PVs) and anaerobic digestion. The analysis was performed for two types of WRPs: conventional (conventional activated sludge system (CAS) bioreactor with secondary clarifiers and dual media filtration) and advanced (bioreactor with membrane filtration (MBR)) treatment satellite WRPs. The associated greenhouse gas (GHG) emissions were also evaluated. For conventional …

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A Project-Based Literature Review Of Girls In Stem Day: A Day-Long Stem Event For Middle School Girls, Emily Carter, Tina Vo Feb 2021

A Project-Based Literature Review Of Girls In Stem Day: A Day-Long Stem Event For Middle School Girls, Emily Carter, Tina Vo

Spectra Undergraduate Research Journal

Research specifically targeted at youth participation in STEM highlights the importance of community engagements outside of school to bolster interest in STEM. Representation of women in STEM and encouragement of girls’ participation and interest in STEM fields parallels the importance of designing and implementing curriculums that enhance middle school-aged girls’ participation in STEM fields. The Girls in STEM Day program hosted by UNLV Scientista Foundation is designed to encourage middle school girls of color from the Clark County School District to find interest in STEM. Interactive activities and framework analysis of the program provides prospective success towards increasing interest and …

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Machine Learning Approaches For The Prediction Of Bone Mineral Density By Using Genomic And Phenotypic Data Of 5130 Older Men, Qing Wu, Fatma Nasoz, Jongyun Jung, Bibek Bhattarai, Mira V. Han, Robert A. Greenes, Kenneth G. Saag Feb 2021

Machine Learning Approaches For The Prediction Of Bone Mineral Density By Using Genomic And Phenotypic Data Of 5130 Older Men, Qing Wu, Fatma Nasoz, Jongyun Jung, Bibek Bhattarai, Mira V. Han, Robert A. Greenes, Kenneth G. Saag

School of Medicine Faculty Research

The study aimed to utilize machine learning (ML) approaches and genomic data to develop a prediction model for bone mineral density (BMD) and identify the best modeling approach for BMD prediction. The genomic and phenotypic data of Osteoporotic Fractures in Men Study (n = 5130) was analyzed. Genetic risk score (GRS) was calculated from 1103 associated SNPs for each participant after a comprehensive genotype imputation. Data were normalized and divided into a training set (80%) and a validation set (20%) for analysis. Random forest, gradient boosting, neural network, and linear regression were used to develop BMD prediction models separately. Ten-fold …

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Computation And Data Driven Discovery Of Topological Phononic Materials, Jiangxu Li, Jiaxi Liu, Stanley A. Baronett, Mingfeng Liu, Lei Wang, Ronghan Li, Yun Chen, Dianzhong Li, Qiang Zhu, Xing Qiu Chen Feb 2021

Computation And Data Driven Discovery Of Topological Phononic Materials, Jiangxu Li, Jiaxi Liu, Stanley A. Baronett, Mingfeng Liu, Lei Wang, Ronghan Li, Yun Chen, Dianzhong Li, Qiang Zhu, Xing Qiu Chen

Physics & Astronomy Faculty Research

© 2021, The Author(s). The discovery of topological quantum states marks a new chapter in both condensed matter physics and materials sciences. By analogy to spin electronic system, topological concepts have been extended into phonons, boosting the birth of topological phononics (TPs). Here, we present a high-throughput screening and data-driven approach to compute and evaluate TPs among over 10,000 real materials. We have discovered 5014 TP materials and grouped them into two main classes of Weyl and nodal-line (ring) TPs. We have clarified the physical mechanism for the occurrence of single Weyl, high degenerate Weyl, individual nodal-line (ring), nodal-link, nodal-chain, …

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The Pencil Code, A Modular Mpi Code For Partial Differential Equations And Particles: Multipurpose And Multiuser-Maintained, The Pencil Code Collaboration, Chao-Chin Yang Feb 2021

The Pencil Code, A Modular Mpi Code For Partial Differential Equations And Particles: Multipurpose And Multiuser-Maintained, The Pencil Code Collaboration, Chao-Chin Yang

Physics & Astronomy Faculty Research

The Pencil Code is a highly modular physics-oriented simulation code that can be adapted to a wide range of applications. It is primarily designed to solve partial differential equations (PDEs) of compressible hydrodynamics and has lots of add-ons ranging from astrophysical magnetohydrodynamics (MHD) (A. Brandenburg & Dobler, 2010) to meteorological cloud microphysics (Li et al., 2017) and engineering applications in combustion (Babkovskaia et al., 2011). Nevertheless, the framework is general and can also be applied to situations not related to hydrodynamics or even PDEs, for example when just the message passing interface or input/output strategies of the code are to …

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Constraining Protoplanetary Disc Accretion And Young Planets Using Alma Kinematic Observations, Ian Rabago, Zhaohuan Zhu Feb 2021

Constraining Protoplanetary Disc Accretion And Young Planets Using Alma Kinematic Observations, Ian Rabago, Zhaohuan Zhu

Physics & Astronomy Faculty Research

Recent ALMA molecular line observations have revealed 3D gas velocity structure in protoplanetary discs, shedding light on mechanisms of disc accretion and structure formation. (1) By carrying out viscous simulations, we confirm that the disc's velocity structure differs dramatically using vertical stress profiles from different accretion mechanisms. Thus, kinematic observations tracing flows at different disc heights can potentially distinguish different accretion mechanisms. On the other hand, the disc surface density evolution is mostly determined by the vertically integrated stress. The sharp disc outer edge constrained by recent kinematic observations can be caused by a radially varying alpha in the disc. …

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Rasagiline Effects On Glucose Metabolism, Cognition, And Tau In Alzheimer’S Dementia, Dawn C. Matthews, Aaron Ritter, Ronald G. Thomas, Randolph D. Andrews, Ana S. Lukic, Carolyn Revta, Jefferson W. Kinney, Babak Tousi, James B. Leverenz, Howard Fillit, Kate Zhong, Howard H. Feldman, Jeffrey Cummings Feb 2021

Rasagiline Effects On Glucose Metabolism, Cognition, And Tau In Alzheimer’S Dementia, Dawn C. Matthews, Aaron Ritter, Ronald G. Thomas, Randolph D. Andrews, Ana S. Lukic, Carolyn Revta, Jefferson W. Kinney, Babak Tousi, James B. Leverenz, Howard Fillit, Kate Zhong, Howard H. Feldman, Jeffrey Cummings

Integrated Health Sciences Faculty Research

Background: A Phase II proof of concept (POC) randomized clinical trial was conducted to evaluate the effects of rasagiline, a monoamine oxidase B (MAO-B) inhibitor approved for Parkinson disease, in mild to moderate Alzheimer's disease (AD). The primary objective was to determine if 1 mg of rasagiline daily for 24 weeks is associated with improved regional brain metabolism (fluorodeoxyglucose–positron emission tomography [FDG-PET]) compared to placebo. Secondary objectives included measurement of effects on tau PET and evaluation of directional consistency of clinical end points. Methods: This was a double-blind, parallel group, placebo-controlled, community-based, three-site trial of 50 participants randomized 1:1 to …

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Piezomagnetic Switching And Complex Phase Equilibria In Uranium Dioxide, Daniel J. Antonio, Joel T. Weiss, Katherine S. Shanks, Jacob P.C. Ruff, Marcelo Jaime, Andres Saul, Thomas Swinburne, Myron Salamon, Keshav Shrestha, Barbara Lavina, Daniel Koury, Sol M. Gruner, David A. Andersson, Christopher R. Stanek, Tomasz Durakiewicz, James L. Smith, Zahirul Islam, Krzysztof Gofryk Feb 2021

Piezomagnetic Switching And Complex Phase Equilibria In Uranium Dioxide, Daniel J. Antonio, Joel T. Weiss, Katherine S. Shanks, Jacob P.C. Ruff, Marcelo Jaime, Andres Saul, Thomas Swinburne, Myron Salamon, Keshav Shrestha, Barbara Lavina, Daniel Koury, Sol M. Gruner, David A. Andersson, Christopher R. Stanek, Tomasz Durakiewicz, James L. Smith, Zahirul Islam, Krzysztof Gofryk

Physics & Astronomy Faculty Research

Actinide materials exhibit strong spin-lattice coupling and electronic correlations, and are predicted to host new emerging ground states. One example is piezomagnetism and magneto-elastic memory effect in the antiferromagnetic Mott-Hubbard insulator uranium dioxide, though its microscopic nature is under debate. Here, we report X-ray diffraction studies of oriented uranium dioxide crystals under strong pulsed magnetic fields. In the antiferromagnetic state a [888] Bragg diffraction peak follows the bulk magnetostriction that expands under magnetic fields. Upon reversal of the field the expansion turns to contraction, before the [888] peak follows the switching effect and piezomagnetic 'butterfly' behaviour, characteristic of two structures …

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Explaining The Economic Impact Of Covid-19: Core Industries And The Hispanic Workforce, Aaron Klein, Ember Smith Feb 2021

Explaining The Economic Impact Of Covid-19: Core Industries And The Hispanic Workforce, Aaron Klein, Ember Smith

Policy Briefs and Reports

As the United States prepares for a COVID-19 recovery, policymakers need to understand why some cities and communities were more vulnerable to the pandemic’s economic consequences than others. In this paper, we consider the association between a city’s core industry, its economic susceptibility to the pandemic, and the recession’s racially disparate impact across six select metropolitan areas. We find that areas with economies that rely on the movement of people—like Las Vegas with tourism—faced substantially higher unemployment at the end of 2020 than cities with core industries based on the movement of information. Further, we find the hardest-hit areas have …

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Coexistence Of Metamagnetism And Slow Relaxation Of Magnetization In Ammonium Hexafluoridorhenate, James Louis-Jean, Samundeeswari M. Balasekaran, Keith V. Lawler, Adrián Sanchis-Perucho, José Martínez-Lillo, Dean Smith, Paul M. Forster, Ashkan Salamat, Frederic Poineau Feb 2021

Coexistence Of Metamagnetism And Slow Relaxation Of Magnetization In Ammonium Hexafluoridorhenate, James Louis-Jean, Samundeeswari M. Balasekaran, Keith V. Lawler, Adrián Sanchis-Perucho, José Martínez-Lillo, Dean Smith, Paul M. Forster, Ashkan Salamat, Frederic Poineau

Chemistry and Biochemistry Faculty Research

© The Royal Society of Chemistry 2021. The (NH4)2[ReF6] (1) salt was studied by X-ray diffraction, Raman spectroscopy, theoretical calculations, and magnetic measurements.1crystallizes in the trigonal space groupP3̄m1 (Re-F = 1.958(5) Å). In the Raman spectrum of1, splitting of the observed peaks was observed and correlated to the valence frequencies of vibration of the [ReF6]2−anion. The study of the magnetic properties of1, through DC and AC magnetic susceptibility measurements, reveals the coexistence of metamagnetism and slow relaxation of magnetization at low temperature, which is unusual in the molecular systems based on the paramagnetic 5d metal ions reported so far.

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Kozai–Lidov Oscillations Triggered By A Tilt Instability Of Detached Circumplanetary Discs, Rebecca G. Martin, Zhaohuan Zhu, Philip J. Armitage, Chao-Chin Yang, Hans Baehr Jan 2021

Kozai–Lidov Oscillations Triggered By A Tilt Instability Of Detached Circumplanetary Discs, Rebecca G. Martin, Zhaohuan Zhu, Philip J. Armitage, Chao-Chin Yang, Hans Baehr

Physics & Astronomy Faculty Research

Circumplanetary discs can be linearly unstable to the growth of disc tilt in the tidal potential of the star–planet system. We use 3D hydrodynamical simulations to characterize the disc conditions needed for instability, together with its long-term evolution. Tilt growth occurs for disc aspect ratios, evaluated near the disc outer edge, of H/r ≳ 0.05, with a weak dependence on viscosity in the wave-like regime of warp propagation. Lower mass giant planets are more likely to have circumplanetary discs that satisfy the conditions for instability. We show that the tilt instability can excite the inclination to above the threshold where …

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Policy Issues In Nevada Education (Full Issue 2021), Unlv College Of Education Jan 2021

Policy Issues In Nevada Education (Full Issue 2021), Unlv College Of Education

Policy Issues in Nevada Education: Policy Papers

No abstract provided.

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The Viability Of Bilingual Education Programs In Nevada, Alain Bengochea, Elizabeth Greer Jan 2021

The Viability Of Bilingual Education Programs In Nevada, Alain Bengochea, Elizabeth Greer

Policy Issues in Nevada Education: Policy Papers

Problem. Approximately 15% of emergent bilinguals (EBs; commonly referred to as English learners) in Nevada demonstrated proficiency in math and English language arts in contrast with the general student population, which achieved proficiencies of 42% and 55% in these subjects, respectively. Therefore, there is a critical need for programs that are responsive to EBs’ linguistic, cultural, and academic strengths. Purpose. This policy paper discusses the need for alternative educational supports for EBs, the effectiveness of bilingual education models compared with prevailing English instructional models, and the possibility of bilingual programming as a viable option in Nevada. Recommendations. Nevada could require …

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Success In Stem: Diversifying Our Stem Workforce By Supporting Our Englishlearner Students’ Mental Health And Academic Achievement, Margarita Huerta, Heather Dahl, Tina Vo Jan 2021

Success In Stem: Diversifying Our Stem Workforce By Supporting Our Englishlearner Students’ Mental Health And Academic Achievement, Margarita Huerta, Heather Dahl, Tina Vo

Policy Issues in Nevada Education: Policy Papers

Problem. Nevada faces a shortage in STEM-qualified employees. Given that our English Learner (EL) community is one of the fastest growing communities in Nevada, policymakers have a vested interest in supporting these students in STEM careers. Unfortunately, EL science scores in Nevada are particular- ly low, implying they are not on a trajectory towards STEM careers. Purpose. This paper provides an overview of recent trends in Nevada policies addressing ELs, STEM, and counseling. It also provides an overview of evidence-based strategies for improving EL success in STEM. Recommendations. We recommend that Nevada educators and policymakers work to 1) Improve quality …

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Retention Starts With Preparation: Preparing Black And Latinx Teachers Through Alternative Routes To Licensure, Iesha Jackson, Doris L. Watson Jan 2021

Retention Starts With Preparation: Preparing Black And Latinx Teachers Through Alternative Routes To Licensure, Iesha Jackson, Doris L. Watson

Policy Issues in Nevada Education: Policy Papers

Problem. Critical to the support and success of students of color is support for Black and Latinx teachers. Yet, teacher preparation programs often neglect the culturally relevant perspectives and experiences of teachers of color. This can contribute to retention issues given challenging school climates that Black and Latinx teachers must navigate. Purpose. The purpose of this paper is to provide an overview of sound teacher recruitment, preparation, and retention practices nationally and draw alignment to the state of Ne- vada. We focus on alternative routes to licensure (ARL) because such programs are touted for increasing the number of teachers of …

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Optimal Two-Stage Designs Based On Restricted Mean Survival Time For A Single-Arm Study, Guogen Shan Jan 2021

Optimal Two-Stage Designs Based On Restricted Mean Survival Time For A Single-Arm Study, Guogen Shan

School of Public Health Faculty Research

© 2021 The Author(s) Restricted mean survival time is an alternative measure of treatment effect to hazard ratio in clinical trials with time-to-event outcome. The current methods have been focused on one-stage designs. In this article, we propose optimal two-stage designs for a single-arm study with the smallest expected sample size. We compare the performance of the new optimal two-stage designs with the existing one-stage design with regards to the expected sample size and the expected total study length. The simulation results indicate that the new two-stage designs can save the expected sample size substantially as compared to the one-stage …

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Science In Your Naturehood, Alison Sloat Jan 2021

Science In Your Naturehood, Alison Sloat

UNLV Best Teaching Practices Expo

Engaging students in hands-on scientific research in their NatureHoods, or local neighborhoods, improves student outcomes, learning, and success in remote learning environments.

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Web-Based System For Students Engagement In The Math Remote Learning Classes, Aleksei Talonov Jan 2021

Web-Based System For Students Engagement In The Math Remote Learning Classes, Aleksei Talonov

UNLV Best Teaching Practices Expo

We would like to present practices of using Web-based systems to enhance interactive learning activities in the Math Remote Learning Classes. We mostly concentrated our attention on PreCalculus and Calculus classes. During the last couple of years, we developed a set of course specific materials in the form of lecture notes and out-of-class assignments. Each major assignment is accompanied by clear and coherent guidelines explaining what kind of skills will be attained by practicing this assignment, how it can be done, what amount of time can it reasonably take, when is it due, and where to get help. Speaking of …

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Nickel Isotopic Evidence For Late-Stage Accretion Of Mercury-Like Differentiated Planetary Embryos, Shui Jiong Wang, Wenzhong Wang, Jian Ming Zhu, Zhongqing Wu, Jingao Liu, Guilin Han, Fang Zhen Teng, Shichun Huang, Hongjie Wu, Yujian Wang, Guangliang Wu, Weihan Li Jan 2021

Nickel Isotopic Evidence For Late-Stage Accretion Of Mercury-Like Differentiated Planetary Embryos, Shui Jiong Wang, Wenzhong Wang, Jian Ming Zhu, Zhongqing Wu, Jingao Liu, Guilin Han, Fang Zhen Teng, Shichun Huang, Hongjie Wu, Yujian Wang, Guangliang Wu, Weihan Li

Geoscience Faculty Research

© 2021, The Author(s). Earth’s habitability is closely tied to its late-stage accretion, during which impactors delivered the majority of life-essential volatiles. However, the nature of these final building blocks remains poorly constrained. Nickel (Ni) can be a useful tracer in characterizing this accretion as most Ni in the bulk silicate Earth (BSE) comes from the late-stage impactors. Here, we apply Ni stable isotope analysis to a large number of meteorites and terrestrial rocks, and find that the BSE has a lighter Ni isotopic composition compared to chondrites. Using first-principles calculations based on density functional theory, we show that core-mantle …

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Toward Understanding Large Deflection Bending Of 3d Printed Ninjaflex®, Lucas K. Gallup, Mohamed Trabia, Brendan O’Toole, Youssef Fahmy Jan 2021

Toward Understanding Large Deflection Bending Of 3d Printed Ninjaflex®, Lucas K. Gallup, Mohamed Trabia, Brendan O’Toole, Youssef Fahmy

College of Engineering Faculty Research

NinjaFlex® is a thermoplastic polyurethane filament that is primarily used for 3D printing. Aside from its low cost and availability, this material is highly flexible, durable, and has a low coefficient of friction. While NinjaFlex® was introduced approximately two decades ago, a comprehensive understanding of the filament’s mechanical behavior, especially in the context of the effect of 3D printing, is still lacking. The goal of this research is to gain a better understanding of the behavior of 3D printed NinjaFlex® specimens when subjected to bending loads that cause large deflection. A series of experiments were conducted to test the bending …

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Addressing The Ecological Fallacy With Lagrangian Inference, Michael Schwob Jan 2021

Addressing The Ecological Fallacy With Lagrangian Inference, Michael Schwob

Calvert Undergraduate Research Awards

Most epidemiologists elect to use statistical models that use population-level data to make inference on the spread of some virus or disease. This has become commonplace in the fields of epidemiology and biostatistics since most data used to construct and verify epidemic models are recorded at the population-level. Obtaining inference from a population-level model may be beneficial in studying the spread of disease in a homogeneous population, but the use of such models to describe a heterogeneous population results in inadequate inference. The inaccuracy of these models is further amplified when one tries to make individual-level inference from these population-level …

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