Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 12361 - 12390 of 1825218

Full-Text Articles in Entire DC Network

Generative Endurance Logic: An Axiomatic Framework For Reasoning About Outcome-Generating Objects Under Constraints, Hafiz Burhan Ul Haq, Muhammad Nauman Irshad Jun 2026

Generative Endurance Logic: An Axiomatic Framework For Reasoning About Outcome-Generating Objects Under Constraints, Hafiz Burhan Ul Haq, Muhammad Nauman Irshad

Neutrosophic Systems with Applications

This paper introduces Generative Endurance Logic (GEL), a formal framework for studying objects through the outcomes they can produce. In many cases, an object cannot be judged only by a fixed truth value, score, or utility value. A rule, model, action, or strategy may behave well in one situation but fail when the context changes or when small perturbations occur. GEL addresses this issue by treating each object as a generator of outcomes. Each object a is linked to a generation map Ga:X×Ω→Y, where X is the context space, Ω is the …

Go to article

Recursive Neutrosophic Superhypergraphs With Illustrative Applications, Takaaki Fujita, Ajoy Kanti Das, Suman Das, Sankar Prasad Mondal, Volkan Duran Jun 2026

Recursive Neutrosophic Superhypergraphs With Illustrative Applications, Takaaki Fujita, Ajoy Kanti Das, Suman Das, Sankar Prasad Mondal, Volkan Duran

Neutrosophic Systems with Applications

Finite hypergraphs generalize ordinary graphs by permitting each hyperedge to join any nonempty set of vertices, and thus provide a natural model for truly multiway interactions. To represent hierarchical and multi-layer structure, SuperHyperGraphs iterate the powerset operation so that set-valued entities created at one level can be treated as vertices at higher levels. Independently, recursive hypergraphs allow edge recursion: an edge may contain not only vertices but also lower-level edges, yielding nested (and possibly self-referential) incidence controlled by a specified recursion depth. In this work we introduce and axiomatize Recursive Neutrosophic SuperHyperGraphs, a unified framework that combines vertex …

Go to article

Mirizzi Syndrome Complicated By Gallbladder Rupture And An Intrahepatic Collection, Shoaa Shetewi, Njoud Aldusary Jun 2026

Mirizzi Syndrome Complicated By Gallbladder Rupture And An Intrahepatic Collection, Shoaa Shetewi, Njoud Aldusary

Journal of King Abdulaziz University: Medical Sciences

Background: Mirizzi syndrome (MS) is a rare complication of chronic gallstone disease, specifically cholecystolithiasis. Diagnosing MS is challenging due to the inflammation that hinders the identification of bile duct complications. Laparoscopic surgery is not recommended due to the risk of intraoperative injuries. Mirizzi syndrome is characterized by an impacted stone at the gallbladder neck that compresses the common hepatic duct and eventually causes ductal erosion. Various imaging modalities facilitate the diagnosis of Mirizzi syndrome.
Objective: This case report aims to highlight the clinical significance of Mirizzi syndrome and the associated diagnostic and surgical challenges.
Methods: A 47-year-old female patient known …

Go to article

Supervision Practices, Institutional Conditions, And Undergraduate Research Quality: A Mixed-Methods Pilot Study In A Clinical Nutrition Program, Noura Mohammed Saleh Eid Jun 2026

Supervision Practices, Institutional Conditions, And Undergraduate Research Quality: A Mixed-Methods Pilot Study In A Clinical Nutrition Program, Noura Mohammed Saleh Eid

Journal of King Abdulaziz University: Medical Sciences

Background: Effective research supervision is vital for developing students' scholarly and professional competencies in higher education. The quality of undergraduate research depends heavily on the supervision practices, structural conditions, and institutional support that shape students' learning experiences.
Aims and Objectives: This study aimed to (1) assess the distribution of supervisory support across research phases, (2) evaluate the influence of institutional conditions on supervisory capacity, and (3) examine the alignment between faculty disciplinary expertise and student research outputs.
Design: A mixed-methods pilot study design was employed.
Methods: The study integrated a retrospective analysis of 50 undergraduate student research projects conducted between …

Go to article

Awareness Of Health Students And Professionals Of The Role Of Medical Physicists Across The Kingdom Of Saudi Arabia, Ahmad Mohammad Subahi Jun 2026

Awareness Of Health Students And Professionals Of The Role Of Medical Physicists Across The Kingdom Of Saudi Arabia, Ahmad Mohammad Subahi

Journal of King Abdulaziz University: Medical Sciences

Prior research has established that awareness of the roles and responsibilities of medical physicists (MPs) is an indicator of radiology knowledge among students and professionals [1]. This study, therefore, set out to assess the awareness of students and professionals regarding the role of MPs in radiology departments in the Kingdom of Saudi Arabia (KSA). The sample comprised 335 participants, both male and female, holding either undergraduate or postgraduate degrees. Data were collected using a questionnaire. Participants' responses indicated strong agreement with the key statements concerning MPs' roles and responsibilities. It was also observed that the understanding of MPs' roles and …

Go to article

Microalgae As Sustainable Biofactories For Bioplastic Production: Challenges And Future Perspectives: A Review, Zahraa Hussein Obaid, Noor S. Naji, Jasim M. Salman, Layla Mustafa A.A. Alkatrani Jun 2026

Microalgae As Sustainable Biofactories For Bioplastic Production: Challenges And Future Perspectives: A Review, Zahraa Hussein Obaid, Noor S. Naji, Jasim M. Salman, Layla Mustafa A.A. Alkatrani

Journal of King Abdulaziz University: Marine Science

The widespread use of traditional plastics, combined with their slow breakdown, has exacerbated environmental and health problems. Therefore, it has become imperative to find alternatives. Due to their simplicity of cultivation, quick growth, tolerance to challenging growing conditions, and low cost, microalgae are being used more frequently as a bio-source for bioplastics lately. Additionally, a variety of biopolymers, including polyhydroxybutyrate, polylactic acid (PLA), starch, polyhydroxyalkanoates (PHA), protein, and cellulose, could be produced by microalgae. These polymers show promising qualities including biodegradability, biocompatibility, and non-toxicity under various cultivation conditions. The purpose of this study is to demonstrate the potential of microalgae …

Go to article

Magnetically Treated Water: Enhancing Stocking Density, Water Quality, And Growth In Nile Tilapia (Oreochromis Niloticus), Mortada M. A. Hussein, Ayatollah A. H. Abd-El Said, Asmaa N. Mohammed, Fatma M. M. Korni Jun 2026

Magnetically Treated Water: Enhancing Stocking Density, Water Quality, And Growth In Nile Tilapia (Oreochromis Niloticus), Mortada M. A. Hussein, Ayatollah A. H. Abd-El Said, Asmaa N. Mohammed, Fatma M. M. Korni

Journal of King Abdulaziz University: Marine Science

This study aimed to explore the potential of using magnetic treated water (MTW) to increase stocking densities of growing Nile tilapia, Oreochromis niloticus, in storage, productive, and/or rearing holding facilities with limited mortality and water loss. The experimental period was 12 weeks, with 1500 O. niloticus fingerlings acclimated with maintained water parameters. After acclimation, 1350 were randomly selected and used for experiment setting up, including its triplicates. For each replicate, 225 fingerlings were distributed in three experimental tanks of MTW units as group set A, B and C, each received 50, 75, and 100 fingerlings, respectively. Besides, 225 fingerlings …

Go to article

Environmental Assessment Of The Shatt Al-Basra Canal: Petroleum Hydrocarbons, Heavy Metals And Water Quality, Mohammed A. Jasim Aldoghachi, Bassam A. B. Alabdul Aziz, Shurooq Al-Mosawi Jun 2026

Environmental Assessment Of The Shatt Al-Basra Canal: Petroleum Hydrocarbons, Heavy Metals And Water Quality, Mohammed A. Jasim Aldoghachi, Bassam A. B. Alabdul Aziz, Shurooq Al-Mosawi

Journal of King Abdulaziz University: Marine Science

The environmental assessment of the Shatt al-Basra Canal in the area of the regulatory was studied. Petroleum hydrocarbons and heavy elements (cobalt (Co), zinc (Zn), lead (Pb), cadmium (Cd), and chromium (Cr)) in the waters of this area were analyzed. In addition, some water quality characteristics were evaluated (salinity, total dissolved solids (TDS), pH, oxygen, biological oxygen demand (BOD5), chemical oxygen demand (COD), nitrate (NO3-), nitrite (NO2-), phosphate (PO4 -3), and ammonia (NH3). Petroleum hydrocarbons had been recorded in studied area and dominated with medium-chain alkanes, namely decane …

Go to article

Impacts Of Coastal Development And Tourism On Fisheries And Aquatic Biodiversity Of The Red Sea: A Review, Lafi S. Al Solami Jun 2026

Impacts Of Coastal Development And Tourism On Fisheries And Aquatic Biodiversity Of The Red Sea: A Review, Lafi S. Al Solami

Journal of King Abdulaziz University: Marine Science

The Red Sea boasts a diverse coastal environment, unique coral reef biodiversity, and fisheries that support rapidly growing marine tourism. Its excellent tourism facilities make it a popular destination. However, intensive tourist activities such as swimming, boating, diving, and fishing have a negative impact on the coastal and marine ecosystem. Additionally, in line with Vision 2030, Saudi Arabia has launched mega projects along the Red Sea coast, increasing tourist activity and leading to human intrusion into critical yet vulnerable marine ecosystems like coral reefs, fish, sea grass beds, and mangrove stands. With the rise in tourism activities and disruptions to …

Go to article

Coastal Landforms Analysis Of Al-Kharrar Lagoon And Rabigh Coast Using Aster (Ast_L1t) Imagery, Western Saudi Arabia, Omar A. Alharbi Jun 2026

Coastal Landforms Analysis Of Al-Kharrar Lagoon And Rabigh Coast Using Aster (Ast_L1t) Imagery, Western Saudi Arabia, Omar A. Alharbi

Journal of King Abdulaziz University: Marine Science

The current study sought to examine the coastal geomorphology throughout the entire length of the Al-Kharrar Lagoon, in addition to the coastal region of Rabigh City, situated on the western coast of Saudi Arabia. The mechanisms underlying the formation of the wide variety of natural land features were also studied. These include sandy, pebble and rocky beaches and sand dunes; intertidal areas; salt flats (sabkhas) and marshes; elevated, terraced or fringing coral reefs; water inlets; and the deposition of terrigenous or alluvial materials, all reflecting the swift transformation that has impacted the region. Evaluation of the ASTER (AST_L1T) data enabled …

Go to article

The Influence Of Reef Shape On The Fish Community Structure Around Coral Reefs Off Jeddah Coast, Red Sea, Kingdom Of Saudi Arabia, Safaa Alowaidi, Lara Aljarafi, Lina Aloufi, Zekra Albeishi, Fay Al-Salem, Lama Alnebehi, Mohamed Abu El-Regal Jun 2026

The Influence Of Reef Shape On The Fish Community Structure Around Coral Reefs Off Jeddah Coast, Red Sea, Kingdom Of Saudi Arabia, Safaa Alowaidi, Lara Aljarafi, Lina Aloufi, Zekra Albeishi, Fay Al-Salem, Lama Alnebehi, Mohamed Abu El-Regal

Journal of King Abdulaziz University: Marine Science

The purpose of this study is to investigate the effect of the reef profile on the associated fish community. Two stations with different reef shape and depth, Bayada and Abotair islands located off Jeddah coast on the Saudi Arabian Red Sea were studied. The reef check was used to determine the proportion of hard coral, soft coral, algae, and other benthic components. A 20 m long by 5 m belt was used to determine the number and colonies and genera of hard and soft corals. Fish were counted using the underwater visual census (UVC) technique along a transect that is …

Go to article

Microplastics Contamination In Marine Environment: Sources And Management Strategies, Aishah Hamdi, Mohammad Oves, Naser Alkenani, Majed Alshaeri Jun 2026

Microplastics Contamination In Marine Environment: Sources And Management Strategies, Aishah Hamdi, Mohammad Oves, Naser Alkenani, Majed Alshaeri

Journal of King Abdulaziz University: Marine Science

Microplastics (MPs) have been identified as emerging global pollutants because of their persistence, mobility, and significant ecological impacts. These particles, which result from the degradation of plastic waste and from various industrial and consumer activities, are now widespread in marine environments. The capacity of MPs to adsorb contaminants and bioaccumulate within food webs increases their ecological and health risks, prompting substantial concern regarding their long-term consequences for marine ecosystems and human health. This review synthesizes current knowledge regarding the composition, sources, transport, mechanisms, and environmental behavior of microplastics (MPs), with particular emphasis on marine systems. In these environments, the persistence …

Go to article

Metabolic Markers And Gut Microbiota In Big Cats: A Relationship Between Diet, Health And Environment, Javeria Saman, Saima Sharif, Bushra Nisar, Shagufta Naz Jun 2026

Metabolic Markers And Gut Microbiota In Big Cats: A Relationship Between Diet, Health And Environment, Javeria Saman, Saima Sharif, Bushra Nisar, Shagufta Naz

Journal of Bioresource Management

The wild animals that occupy large territories were found to adapt less easily to captive environments compared to those with small home ranges. Among big cats, captivity posed a range of challenges, with stress emerging as central factor influencing overall welfare. Transition into captive environment was shown to alter both behavior and physiological processes, largely due to changes in their natural habitat, environmental complexity and diet. Several health issues reported in big cats including alopecia, gastrointestinal issues, neuromuscular disorders such as hindquarter paralysis were associated with underlying metabolic dysregulation. Metabolic health was recognized as critical component of overall well-being, closely …

Go to article

Visual Narratives Of Singapore-Johor Relations Through The 1961 And 1962 Water Agreement, Mohd Firdaus Abdullah, Arba’Iyah Mohd Noor, Ismail Ali, Azian Tahir, Meri Anad Jun 2026

Visual Narratives Of Singapore-Johor Relations Through The 1961 And 1962 Water Agreement, Mohd Firdaus Abdullah, Arba’Iyah Mohd Noor, Ismail Ali, Azian Tahir, Meri Anad

Asia-Pacific Social Science Review

The issue of the Water Agreement between Johor and Singapore has been widely focused among scholars, both in the country and abroad. Various approaches have been used to analyze this issue, including historical perspectives, politics, international affairs, news, academic articles, government policies, and other documentation sources. However, the visual dimension that plays an important role in analyzing power tensions and diplomatic relations related to the 1961 and 1962 Water Treaty is often neglected, even though it has great potential to provide a deeper perspective on this issue. This research focuses on three main videos, namely Singapore lays pipes to draw …

Go to article

Regulatory Immunity As A Driver Of Strategic Superiority: Evidence From Team Mart Supervisors In Erbil, Iraq, Rana Nisan Yousuf, Asreen Ramzi Hasan, Mariwan Gharib Muhammad, Kosret M. Ebabekir Jun 2026

Regulatory Immunity As A Driver Of Strategic Superiority: Evidence From Team Mart Supervisors In Erbil, Iraq, Rana Nisan Yousuf, Asreen Ramzi Hasan, Mariwan Gharib Muhammad, Kosret M. Ebabekir

Journal of Economics and Administrative Sciences

This study aims to investigate the role of regulatory immunity in enhancing strategic superiority from the perspective of supervisors working at the Team Mart Chain in Erbil, Iraq. Understand the notion of regulatory immunity by demonstrating the relationship and influence of the independent variable and its dimensions (organizational learning, memory, and DNA) in strategic superiority. To address the research problem, the following question was examined: to what extent does regulatory immunity contribute to strengthening strategic superiority? However, to acquire empirical data, the researchers created their own survey questionnaire. Empirical data were evaluated using a variety of statistical methods to test …

Go to article

The Impact Of Technological Empowerment On The Strategic Readiness Of Private Universities: The Mediating Role Of Digital Transformation, Rami Fouad Ahmed Al-Sheikhli, Mustafa Mahmoud Al-Somaidaee Jun 2026

The Impact Of Technological Empowerment On The Strategic Readiness Of Private Universities: The Mediating Role Of Digital Transformation, Rami Fouad Ahmed Al-Sheikhli, Mustafa Mahmoud Al-Somaidaee

Journal of Economics and Administrative Sciences

In the context of the Fourth Industrial Revolution, technological empowerment has become a strategic and existential necessity for organizations striving for growth and continued competitiveness, particularly private universities, which face significant challenges in comprehensive digital transformation. Literature reveals the absence of an integrated model linking the three research variables (technological empowerment, strategic readiness, and digital transformation). This paper aimed to examine the mediating role of digital transformation in the impact of technological empowerment on strategic readiness in Iraqi private universities. The study has employed a descriptive analytical approach, utilizing a questionnaire as the primary data collection tool. The questionnaire was …

Go to article

Building An Alumni Network: Strategies And Benefits, Emily Johnson, Elena Carmichael Jun 2026

Building An Alumni Network: Strategies And Benefits, Emily Johnson, Elena Carmichael

Russian Language Journal

This article explains how to build an alumni network and describes the benefits of such initiatives. Echoing the 2024 “Report on English Majors’ Career Preparation and Outcomes” prepared by the ADE Ad Hoc Committee on English Majors’ Career Preparation and Outcomes, it argues that providing students with regular opportunities to hear from and interact with program alumni offers tangible benefits in terms of career preparation. By attending Zoom and in-person alumni career talks, students can learn about the diverse range of jobs where language and literature majors can achieve success. The chance to speak one-on-one with an alumnus/alumna with similar …

Go to article

Religious Trauma And Social Identity Af Santri: A Qualitative Study In A Pesantren Environment, Himmatuz Zakiyah Jun 2026

Religious Trauma And Social Identity Af Santri: A Qualitative Study In A Pesantren Environment, Himmatuz Zakiyah

Journal of Middle East and Islamic Studies

This qualitative study examines religious trauma experiences among Santri in a modern Indonesian pesantren, focusing on how teachers weaponize Qur'anic verses and hadiths as tools of symbolic violence. Data were collected through semi structured interviews with five Santri and alumni from Bumi Shalawat Islamic Boarding School, a pseudonym. Findings reveal that selective quotation, decontextualization, and threat based hermeneutics, which I term scriptural violence, are systematically used to enforce conformity, suppress doubt, and induce shame. This scriptural violence operates through three mechanisms. Theological gaslighting denies Santri's interpretive agency. Eschatological blackmail threatens divine punishment. Prophetic proof texting misuses hadiths to legitimize authoritarian …

Go to article

Mecklenburg County Veteran Needs Assessment, Mary Rachel Keville, Nosa Akol, Zachary Bridgewater, Gilly Cantor, Emily Graham, Vincent Delsignore Jun 2026

Mecklenburg County Veteran Needs Assessment, Mary Rachel Keville, Nosa Akol, Zachary Bridgewater, Gilly Cantor, Emily Graham, Vincent Delsignore

Institute for Veterans and Military Families

Mecklenburg County’s Community Support Services’ Veterans Services Division (MCVSO) has sought to strategically improve their outreach and engagement with veterans and the military community within Mecklenburg County, North Carolina. To achieve this, MCVSO partnered with the D’Aniello Institute for Veterans and Military Families (IVMF) and Veterans Bridge Home (VBH) to design and deliver a community needs assessment focused on understanding the county’s veteran population, identifying service gaps, understanding barriers to care, and assessing how to best engage the veteran population. A multi-format needs assessment survey was designed and marketed towards the military-connected community within Mecklenburg County. The assessment was supplemented …

Go to article

Tumor-Immune Dynamics With Memory And Time Delay: A Fractional-Order Model With Ctla-4 Regulation, Mutaz Mohammad, Mohyeedden Sweidan, Alexander Trounev, Fathalla Rihan Jun 2026

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

All Works

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-γ, 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. …

Go to article

Monte Carlo Analysis Of Dose Distribution In Tumour And Adjacent Healthy Tissues During 192Ir Hdr Brachytherapy In The Presence Of Gold Nanoparticles, Damian P. Tippe, Innocent J. Lugendo Jun 2026

Monte Carlo Analysis Of Dose Distribution In Tumour And Adjacent Healthy Tissues During 192Ir Hdr Brachytherapy In The Presence Of Gold Nanoparticles, Damian P. Tippe, Innocent J. Lugendo

Tanzania Journal of Science

High dose rate (HDR) brachytherapy using 192Ir is an effective modality for cancer treatment; however, its therapeutic efficiency is often constrained by unintended radiation exposure to healthy tissues surrounding the tumour. Fortunately, the incorporation of high atomic number (Z) nanoparticles as radiosensitizers has emerged as a promising strategy to enhance tumour dose while sparing adjacent normal tissues. In this study, the dose distribution in tumour and nearby healthy tissues during 192Ir HDR brachytherapy was investigated in the presence of gold (Au) nanoparticles using Monte Carlo simulations based on the Geant4 toolkit. Radial dose distributions and anisotropy characteristics were analysed …

Go to article

The Role Of Zinc Precursor Concentration In Modulating The Structural, Optical, And Electrical Properties Of Sol-Gel Derived Czts Thin Films, Justine John Tibaijuka Jun 2026

The Role Of Zinc Precursor Concentration In Modulating The Structural, Optical, And Electrical Properties Of Sol-Gel Derived Czts Thin Films, Justine John Tibaijuka

Tanzania Journal of Science

This study reports on CZTS thin films fabricated by sol–gel spin coating using zinc acetate dihydrate, copper acetate dihydrate, tin chloride, and thiourea dissolved in methanol with monoethylamine as a stabilizer. The films were annealed rapidly at 540 °C by using an RTP furnace. Results show the significant influence of zinc concentration on films’ properties with band gap evolution between 1.46 and 1.7 eV, along with high absorption coefficients exceeding 10⁴ cm⁻¹ in the visible range. Structurally, the films evolved from poorly crystalline at low Zn content to well- crystallized, (112)-oriented kesterite near stoichiometry. However, excessive Zn caused slight degradation …

Go to article

Hydrogeochemical Characterization Of Groundwater In Fractured Crystalline Basement Aquifers In Dodoma, Central Tanzania: Implications On Water Quality For Domestic And Irrigation Applications, George J. Ishabairu, Simon R. Melchioly, Charles H. Kasanzu, Gabriel D. Mulibo Jun 2026

Hydrogeochemical Characterization Of Groundwater In Fractured Crystalline Basement Aquifers In Dodoma, Central Tanzania: Implications On Water Quality For Domestic And Irrigation Applications, George J. Ishabairu, Simon R. Melchioly, Charles H. Kasanzu, Gabriel D. Mulibo

Tanzania Journal of Science

Assessment of groundwater hydrogeochemistry characteristics of aquifers plays a vital role in establishing water quality status and its suitability for human and industrial use. The main objective of this research was to carry out hydrogeochemical characterization of groundwater and assess its impacts on water quality and spatial variability of groundwater geochemistry in Dodoma, Tanzania. The methods used include groundwater sampling, laboratory analysis to determine physico- chemical parameters and data processing to classify the groundwater hydrochemical facies. The results show that the average value for pH is 7.2, for electrical conductivity (EC) is 1108 µS/cm and for total dissolved solids (TDS) …

Go to article

Linear Programming Model For Optimal Crop Allocation Under Varying Land Sizes In Pawaga, Tanzania, Mustapha Abbas Kiswanya, Seleman Ismail, Saul Mpeshe Jun 2026

Linear Programming Model For Optimal Crop Allocation Under Varying Land Sizes In Pawaga, Tanzania, Mustapha Abbas Kiswanya, Seleman Ismail, Saul Mpeshe

Tanzania Journal of Science

Farmers often rely on intuition when selecting crops, which can lead to suboptimal profits. In this study, we examine the optimal annual crop allocation under varying land sizes for farmers in Pawaga, Iringa District, Tanzania. A parametric linear programming (LP) model is developed to determine crop allocation combinations that maximise profit subject to land, labour, and capital constraints. Unlike conventional approaches that require separate models for different farm sizes, the proposed model accommodates land holdings ranging from 1 to 9 acres and integrates nine crop types within a single framework. Data were collected over three (3) agricultural seasons from extension …

Go to article

Joint Channel And Phase Noise Estimation For Mmwave Ofdm Systems Using Adaptive Kalman Filtering, Kwame Salum Ibwe Jun 2026

Joint Channel And Phase Noise Estimation For Mmwave Ofdm Systems Using Adaptive Kalman Filtering, Kwame Salum Ibwe

Tanzania Journal of Science

This manuscript presents a joint channel and phase-noise estimation framework for millimeter-wave (mmWave) OFDM systems based on an adaptive extended Kalman filter (EKF). The proposed method formulates a unified state-space model that simultaneously tracks time-varying multipath channels and oscillator phase noise, a critical impairment in 5G NR frequency range 2 (FR2) and emerging 6G transceivers. An innovation-based covariance adaptation mechanism is introduced to enhance estimation accuracy while maintaining computational efficiency. Simulation results demonstrate that the proposed approach achieves up to a 5 dB SNR gain at a target BER of 10⁻³, maintains NMSE below 10⁻³ for linewidths up to 200 …

Go to article

From Tragedy To Liberation: The Tragic Mulatta And Abolition Democracy At The Intersection Of Race And Gender In The Quadroons And The Octoroon, Maram Mohammed Mahmoud Samman Jun 2026

From Tragedy To Liberation: The Tragic Mulatta And Abolition Democracy At The Intersection Of Race And Gender In The Quadroons And The Octoroon, Maram Mohammed Mahmoud Samman

University of Tabuk Journal for Humanities and Social Sciences

This essay explores the figure of the tragic mulatta in Lydia Maria Child’s The Quadroons and Dion Boucicault’s The Octoroon, analyzing how mixed-race female characters critique the racial and gender hierarchies of 19th-century America. Using an intersectional lens, it examines how race, gender, and class shape the identities and tragic fates of Xarifa and Zoe—women who were socially excluded from both Black and White communities. Drawing on W.E.B. Du Bois’s concept of double consciousness and the framework of Abolition Democracy, the essay argues that the tragic mulatta is not merely a narrative trope but a site of political tension and …

Go to article

The Occupational Therapist’S Role In Child And Adolescent Mental Health Services, Sue Ritchie Jun 2026

The Occupational Therapist’S Role In Child And Adolescent Mental Health Services, Sue Ritchie

South West Clinical School Journal

No abstract provided.

Go to article

Modelling Of Dust Devil Flow Dynamics: Effects Of The Sharpness Parameter On Velocity And Pressure, Deepanshu Kumar, Hossein Jafari Jun 2026

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 …

Go to article

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 Jun 2026

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 …

Go to article

Tumor–Immune Dynamics With Memory And Time Delay: A Fractional-Order Model With Ctla-4 Regulation, Mutaz Mohammad, Mohyeedden Sweidan, Alexander Trounev, Fathalla Rihan Jun 2026

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. …

Go to article

First Prev Next Last