Digital Commons Network^™

Flow And Stability Of Three-Dimensional Rotating Viscoelastic Jet, Daniel N. Riahi

School of Mathematical & Statistical Sciences Faculty Publications

We consider rotationally driven nonlinear viscoelastic jet. In contrast to previous unrealistic planar studies with no gravity effect, we investigate here realistic three-dimensional jet with gravity effect. Using theoretical and computational methods, we develop models for such jet and its stability and determine the solutions. We find three-dimensional jet with gravity effect leads to faster and thinner jet. For jet arc length higher than its exit diameter, our calculation with typical parameter values shows that jet radius is smaller by a factor of more than 1.4 and jet speed is higher by factor of more than 2 as are compared …

Assessing Concepts, Procedures, And Cognitive Demand Of Chatgpt-Generated Mathematical Tasks, Bima Sapkota, Liza Bondurant

School of Mathematical & Statistical Sciences Faculty Publications

In November 2022, ChatGPT, an Artificial Intelligence (AI) large language model (LLM) capable of generating human-like responses, was launched. ChatGPT has a variety of promising applications in education, such as using it as thought-partner in generating curricular resources. However, scholars also recognize that the use of ChatGPT raises concerns, such as outputs that are inaccurate, nonsensical, or vague. We, two mathematics teacher educators, engaged in a collaborative self-study using qualitative descriptive approaches to investigate the procedures, concepts, and cognitive demand of ChatGPT-generated mathematical tasks focused on fraction multiplication using the area model approach. We found that the ChatGPT-generated tasks were …

Exploring International Educators' Learning About Local And Global Social Justice In A Virtual Community Of Practice, Bima Sapkota, Xuwei Luo, Muna Sapkota, Murat Akarsu, Emmanuel Deogratias, Daphne Fauber, Rose Mbewe, Fidelis Mumba, Ram Krishna Panthi, Jill Newton

School of Mathematical & Statistical Sciences Faculty Publications

In this chapter, the authors report themes that emerged when a cross-cultural team of researchers involved in a virtual international community of practice (Global Social Justice in Education-GSJE) investigated reflections on activities focused on social justice in local and global contexts. The findings suggested that the activities elicited GSJE community members' understandings of the complexities of social justice associated with naming practices, privilege, and the arts within their own and across contexts. The authors discuss implications of the activities to advance diverse educators' understanding of social justice in global and local contexts. They also unpack the opportunities and challenges that …

Brillouin Zones Of Integer Lattices And Their Perturbations, Herbert Edelsbrunner, Alexey Garber, Mohadese Ghafari, Teresa Heiss, Morteza Saghafian, Mathijs Wintraecken

School of Mathematical & Statistical Sciences Faculty Publications

For a locally finite set, 𝐴⊆ℝ𝑑 , the 𝑘 th Brillouin zone of 𝑎∈𝐴 is the region of points 𝑥∈ℝ𝑑 for which ‖𝑥−𝑎‖ is the 𝑘 th smallest among the Euclidean distances between 𝑥 and the points in 𝐴 . If 𝐴 is a lattice, the 𝑘 th Brillouin zones of the points in 𝐴 are translates of each other, and together they tile space. Depending on the value of 𝑘 , they express medium- or long-range order in the set. We study fundamental geometric and combinatorial properties of Brillouin zones, focusing on the integer lattice and its perturbations. Our …

Enhanced Resolution Method For Electromagnetic Vortex Imaging Based On Electromagnetic Information Theory, Da Liu, Hongyin Shi, Ting Yang, Zhijun Qiao

School of Mathematical & Statistical Sciences Faculty Publications

The electromagnetic vortex imaging possesses independent orbital angular momentum with orthogonal degrees of freedom (DoF), which implies the existence of enhanced information capacity. However, high-mode orbital angular momentum (OAM) beams have stringent generation conditions and inefficient information carrying capacity, which results in limited resolution. This paper proposes a method to combine the electromagnetic information theory (EIT) with the traditional electromagnetic vortex imaging technique, which allows one may obtain more target azimuth information. The DoF, as the main component of information, has been increased to achieve higher azimuth resolution. First, the propagation and imaging model for the electromagnetic vortex with statistical …

Optimizing Energy Consumption In Smart Homes Using Ga-Lstm, Akibor Junior Chukwuka, Bakare-Bolaji Moyosoreoluwa, Baboucarr Dibba

School of Mathematical & Statistical Sciences Faculty Publications

The need to optimize energy consumption arises from the inadequate energy supply many homes face. However, to optimize energy consumption in a home, one must be equipped with the knowledge of the energy consumption rate and energy supply rate in the home. This paper proposed the use of a Long Short-Term Memory (LSTM) model optimized by Genetic Algorithm (GA) to optimize the energy consumption in a smart home. The model was designed using 8 input variables, which were observed weather information of a given region over a span of 350 days. The data set was split into a training data …

Investigating Preservice Teachers’ Conceptualizations Of Mathematical Knowledge For Teaching Through Video Analysis, Bima Sapkota

School of Mathematical & Statistical Sciences Faculty Publications

Mathematics Preservice Teachers’ (M-PSTs) conceptions of Mathematical Knowledge for Teaching (MKT) enhance their reflective skills because they utilize such conceptions to reflect on how to contextualize content knowledge during secondary mathematics teaching. While previous studies suggested M-PSTs develop MKT, including pedagogical content knowledge by analyzing teaching in video lessons, how M-PSTs enhance their conceptions of MKT through such analysis is underexplored. I used a collective case study approach to investigate how four secondary M-PSTs conceptualized MKT when they analyzed and discussed teaching represented in a video lesson using the MKT framework. The findings indicated that the M-PSTs often described teacher …

Use Of Hydroxychloroquine In Multidrug Protocols For Sars-Cov-2, Eleftherios Gkioulekas, Peter A. Mccullough

School of Mathematical & Statistical Sciences Faculty Publications

We review the available evidence supporting the use of hydroxychloroquine-based multidrug protocols in the treatment of COVID-19, in response to a recently published editorial in the Tasman Medical Journal.

Editors' Note

Virginia Journal of Public Health

No abstract provided.

The Role Of Trauma-Informed Care In Sustaining The Well-Being Of Refugee Entrepreneurs, Arielle Badger Newman, Lisa Jones Christensen

Faculty Publications

Many international aid organisations encourage refugees to engage in entrepreneurship after relocation to a new host country. Yet, this encouragement may be based on data about entrepreneurship from non-refugee populations, particularly those who do not experience the common traumas of forced relocation. This chapter addresses the topic of trauma and refugee entrepreneurship by asking the following question: How can support organisations encourage well-being (or mitigate ill-being) for entrepreneurial refugees? In doing so, we propose how organisations supporting refugee entrepreneurship can incorporate trauma-informed practices. Specifically, there are four “Rs” to being trauma-informed, which correspond to: realisation, recognition, response, and resistance to …

Detecting Social Desirability Bias With Human-Computer Interaction: A Mouse-Tracking Study, Paul A. Weisgarber, Joseph S. Valacich, Jeffrey L. Jenkins, David Kim, Manasvi Kumar

Faculty Publications

Social desirability bias undermines self-report accuracy, necessitating novel approaches to detect and mitigate its impact. This study aimed to investigate the influence of social desirability on questionnaire responses by analyzing mouse cursor movements and answering behaviors. Respondents (n=238) completed a health and wellness questionnaire while their mouse cursor data was recorded. The results revealed that individuals under a higher social desirability treatment exhibited significantly longer response times and slower mouse cursor speeds, supporting the hypothesis that they may engage in more cautious and deliberate responding. However, no significant differences were found in terms of mouse cursor deviations or answer switches …

Cleveland Innovation District: A Cippo Panel Brief, Molly Schnoke

All Maxine Goodman Levin School of Urban Affairs Publications

No abstract provided.

Tigra Scientifica, Full Issue

Tigra scientifica

Tigra scientifica, showcasing the outstanding work by Clemson University students in the Creative Inquiry course Popular Science Journalism. Science and technology shape our world in profound ways — from the rise of space tourism to the rapid development of new medical treatments. In a democracy, communicating science is essential for informed debate and decision-making, a responsibility these students have embraced with energy and skill. The magazine began in Spring 2011 under Holly Tuten, Ph.D., who founded the CI course to pass along her passion for science writing. Since then, more than 200 students from 14 majors across five colleges have …

Dynamics Of A 3-D Inlet/Isolator Measured With Fast Pressure-Sensitive Paint, Andrew N. Bustard, Mark E. Noftz, Mitsugu Hasegawa, Hirotaka Sakaue, Joseph S. Jewell, Nicholas J. Bisek, Thomas J. Juliano

Publications

Fast pressure-sensitive paint (PSP) was applied to an inlet/isolator designed using the Osculating Internal Waverider Inlet with Parallel Streamlines (OIWPS) method. The dorsal isolator surface pressure was measured using anodized-aluminum PSP through transparent cast acrylic that makes up the ventral portion of the isolator. Temperature-sensitive paint was utilized to correct for the PSP’s temperature sensitivity. The model was tested under Mach 5.7 flow at Re = 8.5 ×106 /m and 10.2 ×106 /m in the AFOSR–Notre Dame Large Mach-6 Quiet Tunnel (ANDLM6QT) under conventional noise conditions. Flow phenomena, such as shocks originating in the inlet and flow separation at the …

Synthesis Ago Nanoparticles By Nd:Yag Laser With Different Pulse Energies, Munaf S. Majeed, Shaymaa M. Mahmoud Mahmoud, Raghad Majeed Rasheed, Alaa Adnan Rashad

Baghdad Science Journal

One technique used to prepare nanoparticles material is Pulsed Laser Ablation in Liquid (PLAL), Silver Oxide nanoparticles (AgO) were prepared by using this technique, where silver target was submerged in ultra-pure water (UPW) at room temperature after that Nd:Yag laser which characteristics by 1064 nm wavelength, Q-switched, and 6ns pulse duration was used to irradiated silver target. This preparation method was used to study the effects of laser irradiation on Nanoparticles synthesized by used varying laser pulse energy 1000 mJ, 500 mJ, and 100 mJ, with 500 pulses each time on the particle size. Nanoparticles are characterized using XRD, SEM, …

A New Approach For Developing Spectrophotometric Determination Of Phenylephrine Drug In Pure, Pharmaceutics And Serum Samples Using Sodium Periodate As Oxidizing Agent Via A Green Method Of Cfia/Merging Zone Technique, Shahad L. Hamed, Bushra B. Qassim

Baghdad Science Journal

The research involved a rapid, automated and highly accurate developed CFIA/MZ technique for estimation of phenylephrine hydrochloride (PHE) in pure, dosage forms and biological sample. This method is based on oxidative coupling reaction of 2,4-dinitrophenylhydrazine (DNPH) with PHE in existence of sodium periodate as oxidizing agent in alkaline medium to form a red colored product at ʎmax (520 nm). A flow rate of 4.3 mL.min-1 using distilled water as a carrier, the method of FIA proved to be as a sensitive and economic analytical tool for estimation of PHE. Within the concentration range of 5-300 μg.mL-1, a calibration curve was …

Water Treatment Using Zinc Nanoparticles And Apricot Plant Extracts From Organic And Inorganic Pollution, Suzan Muslim Abdullah, Abbas Ali Salih Al-Hamdani, Labeeb Ahmed Al-Zubaidi

Baghdad Science Journal

The apricot plant was washed, dried, and powdered after harvesting to produce a fine powder that was used in water treatment. created an alcoholic extract from the apricot plant using ethanol, which was then analysed using GC-MS, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy to identify the active components. Zinc nanoparticles were created using an alcoholic extract. FTIR, UV-Vis, SEM, EDX, and TEM are used to characterize zinc nanoparticles. Using a continuous processing procedure, zinc nanoparticles with apricot extract and powder were employed to clean polluted water. Firstly, 2 g of zinc nanoparticles were used with 20 ml of polluted …

Semi-Analytical Assessment Of Magneto-Hydrodynamic Nano-Fluid Flow Jeffrey- Hamel Problem, Saja I Abdulridah, Abeer M Jasim

Baghdad Science Journal

In this paper, analyzing the non-dimensional Magnesium-hydrodynamics problem Using nanoparticles in Jeffrey-Hamel flow (JHF) has been studied. The fundamental equations for this issue are reduced to a three-order ordinary differential equation. The current project investigated the effect of the angles between the plates, Reynolds number, nanoparticles volume fraction parameter, and magnetic number on the velocity distribution by using analytical technique known as a perturbation iteration scheme (PIS). The effect of these parameters is similar in the converging and diverging channels except magnetic number that it is different in the divergent channel. Furthermore, the resulting solutions with good convergence and high …

Study Of The Anticancer And Antimicrobial Biological Activity Of A New Series Of Thiohydantoin Derivatives, Qusay Hussein Hays, Dakhil Zughayir Mutlaq

Baghdad Science Journal

Recently, some prostate cancer patients have acquired resistance to the second -generation drugs (anzalutamide and apalutamide) prescribed for the treatment of this disease due to the emergence of the F876L mutation, which represents a challenge to modern medicine. In this study, a new series of 2-thiohydantoin derivatives were prepared through the reaction of different derivatives of maleimide (1c-4c) with isothiocyanate derivatives. The prepared compounds were diagnosed using FT-IR,1H-NMR ,13C-NMR, Mass spectra. The prepared series compounds has been studied against prostate cancer cells. The MTT assay was used to determine the activity of the prepared compounds against prostate cancer cells. The …

Surface Modification Of The Improved Stainless Steel Alloy Aisi-304 And The Use Of Diffusion Coating And A Study Of Its Efficiency In Resistivity Hot Corrosion In An Atmosphere Of Sodium Chloride Vapor Nacl And Sodium Sulfate Na2so4, Taha Mahmoud Khudair, Mahmood Ahmed Hamood

Baghdad Science Journal

This research aims to modify the components of stainless steel alloy by the method of surface engineering through the single diffusion coating technique in order to obtain new alloys with high efficiency in resisting harsh environmental conditions. Steam a mixture of sodium chloride (NaCl) and sodium sulfate (Na2SO4) at a temperature of 900 and then compare it with the base alloy. The results showed that the alloys produced in this way are very efficient. The results showed that the aluminum coating showed high efficiency in resisting oxidation and provided better protection for a longer time compared to the uncoated alloy …

Artificial Neural Network And Latent Semantic Analysis For Adverse Drug Reaction Detection, Ahmed Adil Nafea, Nazlia Omar, Zohaa Mubarak Al-Qfail

Baghdad Science Journal

Adverse drug reactions (ADR) are important information for verifying the view of the patient on a particular drug. Regular user comments and reviews have been considered during the data collection process to extract ADR mentions, when the user reported a side effect after taking a specific medication. In the literature, most researchers focused on machine learning techniques to detect ADR. These methods train the classification model using annotated medical review data. Yet, there are still many challenging issues that face ADR extraction, especially the accuracy of detection. The main aim of this study is to propose LSA with ANN classifiers …

Towards Fairer Nlp Models: Handling Gender Bias In Classification Tasks, Nasim Sobhani, Sarah Jane Delany

Conference papers

Measuring and mitigating gender bias in natural language processing (NLP) systems is crucial to ensure fair and ethical AI. However, a key challenge is the lack of explicit gender information in many textual datasets. This paper proposes two techniques, Identity Term Sampling (ITS) and Identity Term Pattern Extraction (ITPE), as alternatives to template-based approaches for measuring gender bias in text data. These approaches identify test data for measuring gender bias in the dataset itself and can be used to measure gender bias on any NLP classifier. We demonstrate the use of these approaches for measuring gender bias across various NLP …

Winter 2024: Amplifying

The Weldon Times

A student-run publication from the Schulich School of Law at Dalhousie University.

Co-Editors in Chief: Nicole Payette, Elyse Loewen

Book Review: Wapsipinicon Almanac: Selections From Thirty Years, Andy Oler

Publications

The Wapsipinicon Almanac: Selections from Thirty Years, edited by Timothy Fay. Iowa City: University of Iowa press, 2023. xi, 249 pp. Illustrations. $27.50 paperback.

Impact Of Population Aging On Future Temperature-Related Mortality At Different Global Warming Levels, Multi-Country Multi-City (Mcc) Collaborative Network, Patrick Goodman

Articles

Older adults are generally amongst the most vulnerable to heat and cold. While temperature-related health impacts are projected to increase with global warming, the influence of population aging on these trends remains unclear. Here we show that at 1.5 °C, 2 °C, and 3 °C of global warming, heat-related mortality in 800 locations across 50 countries/areas will increase by 0.5%, 1.0%, and 2.5%, respectively; among which 1 in 5 to 1 in 4 heat-related deaths can be attributed to population aging. Despite a projected decrease in cold-related mortality due to progressive warming alone, population aging will mostly counteract this trend, …

Global, Regional, And National Burden Of Mortality Associated With Cold Spells During 2000–19: A Three-Stage Modelling Study, Multi-Country Multi-City (Mcc) Collaborative Network, Patrick Goodman

Articles

Background: Exposure to cold spells is associated with mortality. However, little is known about the global mortality burden of cold spells. Methods: A three-stage meta-analytical method was used to estimate the global mortality burden associated with cold spells by means of a time series dataset of 1960 locations across 59 countries (or regions). First, we fitted the location-specific, cold spell-related mortality associations using a quasi-Poisson regression with a distributed lag non-linear model with a lag period of up to 21 days. Second, we built a multivariate meta-regression model between location-specific associations and seven predictors. Finally, we predicted the global grid-specific …

All-Cause, Cardiovascular, And Respiratory Mortality And Wildfire-Related Ozone: A Multicountry Two-Stage Time Series Analysis, Multi-Country Multi-City (Mcc) Collaborative Network, Patrick Goodman

Articles

Background: Wildfire activity is an important source of tropospheric ozone (O3) pollution. However, no study to date has systematically examined the associations of wildfire-related O3 exposure with mortality globally. Methods: We did a multicountry two-stage time series analysis. From the Multi-City Multi-Country (MCC) Collaborative Research Network, data on daily all-cause, cardiovascular, and respiratory deaths were obtained from 749 locations in 43 countries or areas, representing overlapping periods from Jan 1, 2000, to Dec 31, 2016. We estimated the daily concentration of wildfire-related O3 in study locations using a chemical transport model, and then calibrated and downscaled O3 estimates to a …

Threading The Needle In Extreme Partisan Gerrymandering Cases, Michael Gentithes

Akron Law Faculty Publications

Recent Supreme Court jurisprudence paints a grim picture for future reform to address extreme partisan gerrymandering. The decisions in Rucho v. Common Cause and Moore v. Harper appear to foreclose progress at both the federal and state level. Reformers must neither create unmanageable legal standards for adjudication in federal litigation, nor ask state courts to transgress ordinary bounds of judicial review when interpreting state laws that might address gerrymandering. But there remains a path forward that focuses on clear and detailed state constitutional mandates to curb gerrymandering practices. Beneath their rhetoric, these decisions support clear legal rules over broader democratic …

Technoference In Parenting And Impacts On Parent–Child Relationships And Child Development, Brandon T. Mcdaniel Phd, Lisa Linder, Mariek M.P. Vanden Abeele, Alison K. Ventura, Sarah M. Coyne, Rachel Barr

Health Services and Informatics Research

“Technoference” is a term that describes how parent media use (e.g., phone use) can interfere with parent–child relationships and interactions. Research has shown technoference effects on parents and children ranging in age from infancy to adolescence, such as decreased parent responsiveness and adverse child behavioral outcomes. However, potential benefits of parent media use have also been identified, such as media use to cope with stress, stay connected, increase breastfeeding perseverance, and seek parenting information. Technoference has only been researched for about a decade, and there are large research gaps. We propose a research agenda to parse out long-term or cumulative …

Daily Smartphone Use Predicts Parent Depressive Symptoms, But Parents' Perceptions Of Responsiveness To Their Child Moderate This Effect., Brandon T. Mcdaniel Phd, Sabrina Uva, Jessica Pater, Victor P. Cornet Ms, Michelle Drouin Phd, Jenny Radesky

Health Services and Informatics Research

INTRODUCTION: Smartphone use during caregiving has become increasingly common, especially around infants and very young children, and this use around young children has been linked with lower quality and quantity of parent-child interaction, with potential implications for child behavior, and parent-child attachment. To understand drivers and consequences of parent phone use, we were interested in the daily associations between parent phone use and depressed mood, as well as the potential for parent perceptions of their responsiveness toward their infant to alter the association between parent phone use and mood.

METHODS: In the present study, we explored associations between day-to-day changes …