Digital Commons Network^™

Modelling Of Dust Devil Flow Dynamics: Effects Of The Sharpness Parameter On Velocity And Pressure, Deepanshu Kumar, Hossein Jafari

Mathematical Modelling and Numerical Simulation with Applications

This work discusses the development of a straightforward model of dust devils, demonstrating a method for estimating wind speed and pressure. The current model incorporates momentum equations and the mass conservation equation for steady, axisymmetric, inviscid, and incompressible flow. In this model, the radial velocity is first considered, which is restricted in both the radial and axial directions. The sharpness parameter is also incorporated into the radial velocity formulation, as described by Vatistas model. Using the radial velocity as a foundation, we derive the azimuthal and axial velocities. The study further evaluates the pressure. Notably, for large values of the …

Dynamical Behavior, Extinction And Persistence In A Stochastic Delayed Two-Strain Epidemic Model With A Generalized Crowley-Martin Incidence Rate, Amina Allali, Dounia Bentaleb, Saida Amine

Mathematical Modelling and Numerical Simulation with Applications

This paper develops and analyzes a novel delayed stochastic SIR epidemic model with two interacting strains and general incidence functions. By establishing the existence and uniqueness of a positive global solution, the well-posedness of the model under stochastic perturbations is ensured. Extinction occurs when the stochastic reproduction number falls below unity, as demonstrated through Itô calculus and martingale convergence theorems, while persistence is guaranteed under the Crowley–Martin incidence when it exceeds one. Numerical experiments based on the Positive Preserving Truncated Euler–Maruyama (PPTEM) scheme confirm the analytical predictions and highlight the influence of time delay and noise intensity on the long-term …

Tumor–Immune Dynamics With Memory And Time Delay: A Fractional-Order Model With Ctla-4 Regulation, Mutaz Mohammad, Mohyeedden Sweidan, Alexander Trounev, Fathalla Rihan

Mathematical Modelling and Numerical Simulation with Applications

This study develops a fractional-order tumor-immune interaction model incorporating Caputo memory effects, delayed immune activation, and CTLA-4 checkpoint regulation. The model describes the coupled dynamics of tumor cells, CD4$^{+}$ T cells, IFN-$\gamma$, and CTLA-4, and extends classical integer-order tumor-immune models by accounting for hereditary immune responses and biologically motivated latency effects. Theoretical properties, including positivity, boundedness, equilibrium structure, and fractional-order stability, are examined to establish the biological and mathematical consistency of the model. The delayed fractional system is then investigated computationally by comparing several numerical methods, including finite difference discretization, Daubechies wavelet collocation, Euler wavelet collocation, and a predictor-corrector scheme. …

Stochastic Analysis Of Epidemic Size And Peak Infection In An Svir Model With Imperfect Vaccine And External Source Of Infection, María Gamboa Pérez

Mathematical Modelling and Numerical Simulation with Applications

The dynamics of an infectious disease outbreak are studied under a stochastic framework in a closed population where individuals are homogeneously mixed. A vaccination program is implemented in the community prior to the start of the epidemic. The administered vaccine is imperfect, meaning that vaccinated individuals may still become infected upon contact with infected individuals. The mathematical Susceptible-Vaccinated-Infected-Recovered (SVIR) model describing the evolution of the epidemic is formulated as an absorbing, continuous-time, three-dimensional Markov chain with compartments for vaccinated, susceptible, infected and recovered individuals. The aim of this study is to characterize two fundamental epidemiological quantities: the maximum number of …

Numerical Method For Strongly Variable-Density Flows At Low Mach Number: Flame-Sheet Regularisation And A Mass-Flux Immersed Boundary Method, Matheus P. Severino, Fernando F. Fachini, Elmer M. Gennaro, Daniel Rodríguez, Leandro F. Souza

Mathematical Modelling and Numerical Simulation with Applications

A low-Mach-number flow, in the laminar regime, has intrinsically two characteristic spatial scales for a given time scale, or two characteristic temporal scales for a given spatial scale, and these dual scales are very different due to the disparity between the flow and acoustic speed. Therefore, low-Mach-number flows impose mathematical and computational challenges in their description. Standard numerical methods for compressible flows, which are typically designed for problems with a single dominant spatial and temporal scale, require alternative approaches, such as preconditioning techniques or solvers tailored for low-Mach-number equations. The present work introduces a simplified fluid dynamics model for flows …

A Case Study Of Sport And Racism In Australia: A Qualitative Document Analysis, Vegneskumar Maniam, Kristy O’Neill

Asia-Pacific Social Science Review

Australia is well known as a ‘sporting nation’ with outstanding elite sporting achievements and grassroots-level sports participation. The reality for Australia’s First Nations people and those from Culturally and Linguistically Diverse (CALD) backgrounds, however, tends to differ from the mainstream Australian population. One of the contributing factors being argued within this paper is the prevalence of historical and contemporary racism in Australian sport. This study focuses on four of Australia’s most popular community-participation sports, including Australian Rules Football (ARF), Cricket, Netball, and Swimming. Using a Qualitative Document Analysis method, this research investigates both primary and secondary sources for instances of …

Grade Level Differences In The Impact Of A Mental Health And Substance Use Program Among Filipino Junior High School Students, Trixia Anne C. Co, Maria Regina Hechanova, Jayson A. Soliman, Jerame N. Gamboa, Plato B. Mercado, Rodel T. Alimurong, Joan N. Puebla, Criselda G. Nicdao

Asia-Pacific Social Science Review

No abstract provided.

Re: Conditional Approval Letter For Diggings East 100% Remedial Design Package Submittal (Dated May 29, 2006), Emma Rott

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

Re: Conditional Approval Letter For The Butte Priority Soils Operable Unit (Bpsou) Silver Bow Creek Conservation Area (Sbcca) Operations And Maintenance (O&M) Plan (Dated May 29, 2006), Emma Rott

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

Re: Conditional Approval Letter For The Final Revised Silver Bow Creek Conservation Area (Sbcca) Construction Quality Assurance Plan (Cqap) (Dated May 28, 2026) And The Final Silver Bow Creek Conservation Area (Sbcca) Construction Monitoring Quality Assurance Project Plan (Qapp) (Dated May 28, 2026), Emma Rott

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

Third Butte Rmap Biomonitoring (Phase 3) Report, Ramboll, Atlantic Richfield Company

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

Natural Radioactivity And Radiological Hazards In Sediments From The Lindi Coast, Indian Ocean, Tanzania, Viator Mujuni, Innocent J. Lugendo

Tanzania Journal of Science

The Lindi coast of the Indian Ocean, located in southeastern Tanzania, supports rich biodiversity and has recently experienced rapid growth in socio-economic activities such as fishing, mining, and oil and gas exploration. These activities may enhance levels of natural radioactivity in coastal sediments, potentially increasing radiation exposure to local populations. Therefore, monitoring radioactivity levels and estimating associated radiation doses in this region is important. In this study, thirty-six sediment samples were collected from twelve locations along the Lindi coast and analysed for naturally occurring radionuclides using high-purity germanium (HPGe) gamma-ray spectrometry. The activity concentrations of ²²⁶Ra, ²³²Th, and …

Concealed History Of Microplastic Pollution In The Msimbazi Estuary, Dar Es Salaam, Tanzania, Dativa J. Shilla

Tanzania Journal of Science

This study reconstructed the historical deposition of microplastics in sediments of the Msimbazi Estuary, Tanzania, using a radiometrically dated sediment core. Sediment chronology established using ²¹⁰Pb and the Constant Initial Concentration (CIC) model provided an approximately 83-year depositional record. The ²¹⁰Pb age model suggested marked temporal variability in sedimentation rates, with peaks around 1961, 1998, 2013, and 2015, potentially reflecting hydrological extremes and catchment disturbances. Anthropogenic microparticles were detected throughout most of the sediment core, with concentrations ranging from below detection limit (BDL) to 34 items kg⁻¹ dry weight (mean 8.5 ± 3.2 items kg⁻¹), and their abundance generally increased …

Skill Acquisition: Evaluation Of Instructional Procedures, Ellen I. Ratliff

USF Tampa Graduate Theses and Dissertations

Identifying effective and efficient interventions is essential for establishing independent responding in learners with autism spectrum disorder and related developmental disabilities. The present study replicated and extended Gorgan and Kodak (2019) by comparing differential reinforcement, most-to-least prompt fading, and extended response interval procedures for teaching novel skills to three children with autism spectrum disorder who did not demonstrate prompt-dependent responding. Using an adapted alternating treatments design, each intervention was evaluated against a control condition with an equated opportunity interval. Extensions to prior research included conducting a reinforcer assessment to verify differentiation in stimulus potency, modifying the controlling prompt assessment to …

Re: Conditional Approval Letter For The Final Silver Bow Creek Conservation Area Materials Management Plan (Dated May 28, 2026), Emma Rott

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

Associations Between Self And Peer's Fear Of Fat In Predicting Dietary Restraint, Weight/Shape/Eating Concerns, And Thin-Ideal Internalization: A Dyadic Exploration In Female Friend Pairs, Sm O'Connor, Cg Martin, Leora L Haller, S Marhan

Department of Psychology Faculty Scholarship and Creative Works

Objective Fear of fat may reflect concern regarding rejection one may experience at a higher weight. Peers play a major role in socialization and support during adolescence and young adulthood. While studies have highlighted peers as an important source of influence underlying disordered eating, it is unclear whether one's own fear of fat or peers' fear of fat is associated with concerns about weight, shape, eating, and eating behaviors.Method The present study used data from 94 female friend pairs (mean age = 20.18, SD = 1.77). Actor-partner interdependence models were conducted to explore the extent to which one's own fear …

Puberty In Down Syndrome, Katie Frank, Hannah Graham Md

Advocate GME

Puberty is a normal part of growth and maturation that comes with its own challenges. People with Down syndrome experience many of the same challenges as individuals without Down syndrome but may require additional supports to understand and accept the changes that puberty brings. In this webinar, Hannah Graham, MD, and Katie Frank, PhD, OTR/L, will describe how puberty in people with Down syndrome is similar and different to puberty in people without Down syndrome and share resources to support individuals with Down syndrome during this time of transition.

Social Complex Systems In Virtual Thirdspaces Of Global Education: Sites Of Structural Inequalities And Radical Pedagogical Possibilities, José Luis Jimenez-Figarotti

Electronic Theses and Dissertations 2020 - Present

While Collaborative Online International Learning (COIL) and Virtual Exchange (VE) are celebrated as democratizing tools fostering intercultural understanding, this techno-utopian narrative obscures a complex reality: the virtual classroom is a contested social field where global inequalities are reproduced and amplified. This dissertation interrogates this paradox, exploring how structural inequalities, digital divides, and epistemic hierarchies are negotiated within the Virtual Thirdspace of global education. Integrating Structural Inequalities (Galtung, 1969; Farmer, 2004; Tilly, 1998; and Young, 2008), Critical Environmental Justice (Pellow, 2018), Intersectionality (Crenshaw, 1989), World-Systems Analysis (Wallerstein, 1974), and Thirdspace theory (Soja, 1996), the study examines this terrain as both a …

Exploring Tourism Business Voices In Navigating Pandemic Crisis And Resilience-Building, Godwin Adiel A. Lema

Tanzanian Economic Review

COVID-19 challenged mobility, redefining crisis navigation and resilience. A modified Challenge Metamorphosis Model (CMM) is proposed to understand crisis navigating process in tourism business resilience-building. A pragmatic mixed-method design, involving 158 tourism-business respondents, multiple regions, interviews, and observation during June–November 2020, was applied. Impacts, challenges, opportunities, varied business responses and outcomes were mirrored. Immediate reactive closure and booking cancellation responses were distinguished from proactive adaptive business continuity measures with low visitors, postponement, few bookings and negotiable employment flexibility. Health, safety, and culturally embedded coping practices and their reinvention aided crisis navigation. Medium-term crisis navigating strategies were differentiated from long-term resilience-building …

The Effects Of Household Shocks On Women’S Self-Reported Health In Tanzania, Yoeni Silas Kaniki, Wilhelm Michael Ngasamiaku, Innocent Muganyizi Pantaleo

Tanzanian Economic Review

Household shocks are among the factors that deteriorate women's self-reported health (SRH). Accordingly, we analyse the effects of household shocks on women’s self-reported health using a sample of 4,958 women aged 18 years and above from waves 4 (2014/2015) and 5 (2020/2021) of the Tanzania National Panel Survey. We employ a correlated random-effects (CRE) ordered probit model to control for unobserved heterogeneity in an ordered outcome. We find that aggregate shocks increase the likelihood of reporting poor health by 0.6 percentage points while simultaneously reducing the probability of reporting better health by 1.9 percentage points. Moreover, women experiencing economic shocks …

Firm Level Labour Productivity Drivers And Export Status In Tanzania, Mgeni E. Msafiri, Vincent Leyaro, Rosemary Taylor

Tanzanian Economic Review

This study analysed the drivers of firm-level labour productivity by export status and estimated the counterfactual gains from exporting. Using the 2022 nationally representative Tanzania Enterprise Survey and an endogenous switching regression model, results revealed significant differences in the drivers of labour productivity between exporting and non-exporting firms. The productivity of exporting firms was positively associated with business linkages with small and medium-sized enterprises, foreign ownership, access to finance, and capital intensity. Similar factors were associated with labour productivity among non-exporting firms, alongside linkages with large firms. However, access to finance had asymmetric patterns: exporting firms benefited from greater financial …

Cash Transfer For Orphans And Vulnerable Children And Households’ Vulnerability To Poverty In Kenya: Evidence From Panel Data, Molly Owino-Owiti, Damiano Kulundu Manda, Samuel Misati Nyandemo

Tanzanian Economic Review

This study examined the effect of the Cash Transfer for Orphans and Vulnerable Children (CT-OVC) programme on vulnerability to poverty of households that had experienced a health shock in Kenya. The study used a three-wave panel data set for Kenya, collected in 2007, 2009, and 2011. A Fixed Effects model was used in the estimation. The study found that CT-OVC can reduce households’ Vulnerability to Asset Poverty (VAP) by 6.7 percent and Vulnerability to Food Poverty (VFP) by 33.8 percent. The VAP did not decline as much as VFP, indicating that the transfer may not be sufficient to reduce several …

Mobile Money And Economic Wellbeing In Sub-Saharan Africa: Evidence From The 2021 Global Findex Survey, Emanuel Sulle Joseph, Martin Chegere, Kenneth Mdadila

Tanzanian Economic Review

Mobile money has expanded rapidly across Sub-Saharan Africa, accompanied by increasing mobile phone ownership and a growing number of registered users. Despite this, there is a concern about its effects on well-being. It has been argued that mobile money favoured those who were already financially included and financially stable. Therefore, the study used the Global Findex 2021 database, with a sample of 22686 respondents, to analyse the effects of mobile money on well-being and disaggregated the results by sex and location. The study employed binary probit regression and the results indicated that mobile phone ownership is not significantly associated with …

Determinants Of Hypertension Status Among Patients With Type 2 Diabetes Mellitus At Menteng Primary Health Center, 2024–2025, Ira Susanti Haryoso, Yudha Radityadana, Muthik Hanim Mufallahah, Lhuri Dwianti Rahmartani

Jurnal Epidemiologi Kesehatan Indonesia

Hypertension is a common comorbidity in patients with type 2 diabetes mellitus (T2DM) and substantially increases the risk of both macrovascular and microvascular complications. Data on the determinants of hypertension status among T2DM patients in primary healthcare settings remain limited. This study aimed to analyze the determinants of hypertension status in T2DM patients at Puskesmas Menteng during 2024–2025. This was an analytic observational study employing a cross-sectional design. Study subjects comprised T2DM patients registered and undergoing examinations at Puskesmas Menteng over the 2024– 2025 period. Data were extracted from electronic medical records, included age, sex, occupation, socioeconomic status, blood pressure, …

Urban-Rural Differences In The Association Between Physical Activity And Overweight/Obesity Among Indonesian Adolescents: A Cross-Sectional Study, Wahyu Wulandari, Mufti As Siddiq M. Irzal, Lady Farah Fatmawati

Jurnal Epidemiologi Kesehatan Indonesia

Adolescent overweight/obesity is an increasing public health concern and contributes to the risk of non-communicable diseases later in life. Physical activity plays an important role in weight regulation. However, its association with overweight/obesity may vary according to residential setting. This study aimed to examine the association between physical activity and overweight/obesity among adolescents living in rural and urban areas of Indonesia. A cross-sectional study was conducted using data from the 2023 Indonesian Health Survey. The study included 115,372 adolescents aged 10–18 years. Physical activity was classified based on total Metabolic Equivalent of Task (MET)-minutes per week (≥600 MET-minutes/week), while nutritional …

Associated Factors Of Quality Of Life In Hypertensive Patients: A Cross-Sectional Study In Riau Province, Indonesia, Dhimas Maybelliano, Rajunitrigo Rajunitrigo, Lita Lita, Abdurrahman Hamid, T Abdur Rasyid

Jurnal Epidemiologi Kesehatan Indonesia

Hypertension is a chronic condition that adversely affects quality of life (QoL). Identifying factors associated with QoL is essential for improving hypertension management. This study aimed to identify factors associated with QoL among hypertensive patients in Riau Province, Indonesia. A cross-sectional study was conducted from December 2024 to January 2025 at two public health centers in Riau Province: Puskesmas Rejosari in Pekanbaru City and Puskesmas Bagansiapi-api in Rokan Hilir Regency. A total of 150 hypertensive patients aged 25-59 years were enrolled. QoL was assessed using the WHOQOL-BREF questionnaire. Independent variables included sociodemographic characteristics, comorbidities, dietary patterns, and physical activity. Data …

In Vitro Anticancer Evaluation Of Tamoxifen And Paclitaxel-Loaded Chitosan Nanoparticles Against Breast And Lung Cancer With In Silico Docking, Arshia Amaan, Farah Mehak, Amer Jamil, Fatma Hussain

Journal of Bioresource Management

Breast and lung cancer are the primary cause of death worldwide, underlining the need for an improved therapeutic strategy. In the current study, tamoxifen (TAM) and paclitaxel (PTX) loaded chitosan nanoparticles (NPs) were produced for the evaluation of sustained drug delivery and enhanced anticancer potential of nanocarriers over conventional chemotherapy against breast and lung cancers, respectively. Nanoparticles were produced by the ionic gelation method and characterized by UV-visible spectroscopy, Dynamic Light Scattering and Fourier Transform Infrared Microscopy (FTIR), verifying the nanoscale morphology, stability and successful encapsulation. A drug release profile study (in vitro) (78 %, 60-75 %) and …

Prevalence And Risk Factors Association Of Babesiosis In Cattle And Buffaloes In District Naushahro Feroze, Sindh, Pakistan, Kazim Raza, Amjad Hussain, Sajid Moin, Huzaifa Arain, Muhammad Mohsen, Maria Abubakar, Erum Bughio, Barkat Ali

Journal of Bioresource Management

Background: Bovine babesiosis is a protozoan disease that is transmitted by ticks and has significant veterinary and economic impacts on tropical livestock systems. Prior to this study, no epidemiological data was available of Sindh, Pakistan.

Purpose: To estimate the Babesia spp. prevalence and estimate the risk factors with respect to cattle and buffaloes in five tehsils of District Naushahro Feroze, Sindh, Pakistan.

Methods: A cross-sectional study was conducted using 200 blood samples (100 Thari cattle; 100 Kundhi buffaloes; both sexes) in five tehsils (Kandiaro, Moro, Mehrabpur, Bhiria and Naushahro Feroze). Thin blood smears under Giemsa stain were viewed under oil-immersion …

Evaluation Of Heavy Metal And Health Risks Of Well Water In Abobo, Osara And Osaragada Communities In Kogi State, North-Central, Nigeria, Muhammed Haruna Isah, Blessing Ahmed, Dauda Tanko, Adang Kombe Lucas

Journal of Bioresource Management

Human health may be at risk if drinking water contains excessive amounts of heavy metals (HMs). To determine risks related to heavy metals, fifteen water samples were taken every month between July and September, 2024 from the communities of Abobo (Site A), Osara (Site B) and Osaragada (Site C) close to Confluence University of Science and Technology, Osara. These samples were tested for ten HMs (Cu, Fe, Ni, Zn, Co, Cd, As, Cr, Hg, Pb) with the aid of Atomic Absorption Spectroscopy. The average concentration ranges as follows: Fe (0.378-0.511 mg/l), Cu (1.643-1.720 mg/l), Ni (0.31-0.556 mg/l), Zn (0.17-0.271 mg/l), …

Isolation, Quantification, And Characterization Of Microplastics In Atmospheric Fallout Across Different Areas Of Lahore, Punjab, Pakistan, Muhammad Rizwan, Aqib Javed, Muhammad Javed Islam, Kashif Riaz, Asif Bilal, Muhammad Nasir, Ayesha Ali

Journal of Bioresource Management

Microplastics have become widely dispersed in our environment, and even in the air we breathe. The present research aims at identifying and determining the amounts of microplastics present in atmospheric fallout over Lahore city, which is characterized by a large population and several manufacturing industries. In order to find out the existence of microplastics, samples of atmospheric fallout were collected from various sites across hustling municipalities of Lahore that included urbanized settlements. The analysis disclosed that there are various forms of microplastic fibers, fragments and granules indicating different sources of pollution. The identified ones varied from 114.485 µm to 2034.731 …