Digital Commons Network^™

Stochastic Control Of Inventory And Scheduling Decisions In An Open Network Of Repairables, Erhun Özkan

Turkish Journal of Mathematics

We study maintenance operations for capital goods with repairable components. Because the downtime of a capital good is costly, the maintenance provider keeps an inventory of spare parts to quickly replace broken parts of the capital goods. After the replacement, the broken part is added to the repair facility’s repair queue. Upon a part breakdown, if there is no spare part in the inventory, then the maintenance provider has two options: (i) it can backorder the spare part demand, (ii) it can execute an emergency repair, which is done immediately and quickly, and is followed by a quick installation of …

A Full-Scale Watertight Workflow Numerical Study For A Triangular Fin And Tube Heat Exchanger, Hamdi̇ Selçuk Çeli̇k, Bahadir Doğan, Lati̇fe Berri̇n Erbay

Turkish Journal of Mathematics

In this study, the thermo-hydraulic characteristics of an air-cooled triangular finned tube heat exchanger were analyzed numerically. The full-scale heat exchanger was modeled using Ansys Fluent watertight workflow, considering water as the primer fluid to precisely investigate the effects of geometrical factors. The effects of fin height, fin width, and fin spacing of the triangular fins on the performance of the heat exchanger were examined using k-ω turbulence model. A basic finned-tube heat exchanger model, which was manufactured as a monolithic structure without tube-fin contact resistance by milling from aluminum 5083 material, was tested in an air tunnel to verify …

Characterizations Of Bi-Riordan Arrays, Nai̇m Tuğlu, Fatma Yeşi̇l Baran

Turkish Journal of Mathematics

In this study, we introduce the concept of a bi-Riordan array. As part of this construction, we define new composition and power operations. We then establish an analogue of the well-known fundamental theorem of Riordan arrays (FTRA), which we call the fundamental theorem of bi-Riordan arrays. Next, we show that the product of two bi-Riordan matrices is again a bi-Riordan matrix. Using this product structure, we prove that the set of bi-Riordan matrices forms a monoid.

​Compact And Am-Compact Orthogonally Additive Operators, Bahri̇ Turan, Bi̇rol Altin

Turkish Journal of Mathematics

We show that compactness of orthogonally additive operators between Banach lattices is not preserved under taking the modulus by providing a nonlinear analogue of Krengel’s example. In contrast, for operators acting from a Banach lattice into an AM-space, AM-compactness is stable under lattice operations. Moreover, the space of absolutely norm bounded AM-compactorthogonally additive operators from a Banach lattice into an AM-space is a Banach lattice, and on such AM-spaces with the weak Fatou property, norm boundedness coincides with absolute norm boundedness.

Cover And Contents

Turkish Journal of Mathematics

No abstract provided.

Generalized Spectral Bound For Quasi-Twisted Codes, Buket Özkaya

Turkish Journal of Mathematics

Minimum distance bounds play a central role in the analysis of algebraic codes. For cyclic and constacyclic codes, several bounds based on their zero set have been developed. However, analogous results for quasi-twisted (QT) codes are comparatively limited. In this paper, we further investigate the spectral theory of QT codes and derive a general spectral bound on their minimum distance. Our bound unifies and generalizes previously known spectral bounds for quasi-cyclic (QC) and QT codes, and contains them as special cases. We present a new proof technique and show that the bound can be formulated with respect to an arbitrary …

A Novel Iterative Algorithm For Approximating Common Fixed Points Of Generalized Α-Nonexpansive Multivalued Mappings In Kohlenbach Hyperbolic Spaces, Makbule Kaplan Özekes

Turkish Journal of Mathematics

In this paper, we propose a new iterative scheme involving three multivalued mappings in Kohlenbach hyperbolic spaces. Strong and ∆-convergence theorems are established for approximating common fixed points of nonexpansive multivalued mappings under suitable conditions. A numerical example is also presented to illustrate the efficiency and faster convergence of the proposed method. The results obtained extend and unify several related contributions in the existing literature.

On The Generalized Cesàro Sequence Spaces And Some Of Their Properties, Uğur Gönüllü, Faruk Polat, Martin Richard Weber

Turkish Journal of Mathematics

Let C_t = (c_nm)_n,m∈ℕ denote the generalized Cesàro matrix defined by c_nm = t^n−m/n for m ≤ n and t ∈ [0, 1], and c_nm = 0 otherwise. For each q ∈ [1, ∞), the associated generalized Cesàro sequence spaces ces_q^t are introduced. These spaces form Banach lattices under the coordinatewise order, equipped with a naturally defined order continuous norm. We prove that ces_q^t = ces_q⁰ for all t ∈ [0, 1) and q ∈ [1, ∞), implying that the space …

Exponential Stability For A Strongly Damped Wave Equation With Distributed Internal Delay, Manal Alotaibi, Nasser-Eddine Tatar, Waled Al-Khulaif

Turkish Journal of Mathematics

This paper investigates the exponential stability of a strongly damped wave equation subject to an internal distributed time delay. Two distinct analytical frameworks are developed: the first employs a modified energy method based on auxiliary functionals, while the second introduces a transformation that rewrites the delay term as the derivative of a convolution integral. Both approaches yield explicit decay conditions and establish exponential convergence of the energy under weaker assumptions on the damping coefficient and the delay kernel. Notably, the transformation method allows for a wider class of admissible delay weights than those permitted by classical techniques. Numerical simulations based …

Clairaut Conformal Submersions From Ricci Solitons, Murat Polat

Turkish Journal of Mathematics

In this study, we investigate Clairaut conformal submersions in the context of total manifolds that support a Ricci soliton structure. We begin by deriving the scalar curvature and Ricci tensor expressions associated with these manifolds, and we establish criteria under which the fibres can be characterized as almost Ricci solitons or Einstein manifolds. Additionally, we identify the conditions required for the base manifold to admit Ricci soliton and Einstein structures. We also determine the necessary conditions for a vector field ζ to be conformal or Killing. Moreover, we demonstrate that when the potential vector field of the Ricci soliton is …

A Delayed Siamr Prostate Cancer Model With Vertical Transmission And Treatment: Stability Analysis And Numerical Simulation, Hüseyi̇n Demir, İnci̇ Çi̇li̇ngi̇r Süngü, İbrahi̇m Keles

Turkish Journal of Mathematics

​In this paper, we propose and analyse a delayed-compartmental mathematical model of prostate cancer dynamics that incorporates vertical transmission and therapeutic intervention. The population is stratified into five compartments: susceptible (S), infected/virally activated (I), asymptomatic infectious under treatment (A), malignant untreated (M), and recovered (R). A discrete time delay τ > 0 is introduced in the force-of-infection term to model the age-dependent onset of susceptibility in middle-aged adult males. Vertical transmission of viral etiology at a rate qΛ ensures that a fraction of newborns enter the infected compartment directly, rendering the disease persistent regardless of the basic reproduction number R₀. We …

Hyers-Ulam And Hyers-Ulam Rassias Stability Of Caputo Fractional Hahn Difference Equations, Karima Mohamed Oraby, Alaa E. Hamza, Afrah Al-Bossly

Turkish Journal of Mathematics

​In this paper, we investigate Hyers–Ulam and Hyers–Ulam–Rassias stability for fractional linear Hahn difference equations of Caputo Type. To the best of our knowledge, this is the first work concerning Hyers–Ulam type stability in the framework of Caputo fractional Hahn difference equations, thereby filling a significant gap in the literature on fractional stability theory. Our approach is based on establishing an equivalence between the fractional Hahn difference initial value problem and a corresponding fractional integral equation, via the Caputo–Hahn inversion formula. These results lay a strong groundwork for analyzing the stability of Hahn fractional systems, which could be useful in …

A Note On The Periodic Orbits Of Wolbachia Spread Dynamics In Mosquito Populations In Periodic Environments, Jose S. Cánovas

Turkish Journal of Mathematics

We consider the periodic model introduced by B. Zheng and J. Yu, and disprove the conjectures on the number of periodic orbits the model can have. We rebuild the conjecture to prove that for periodic sequences of maps of any period, the number of nonzero periodic trajectories is bounded by two.

Teaching Strategic Intelligence In Political Transition, Henry W. Prunckun

Journal of Strategic Security

Scholarship on intelligence ethics centers on operations, leaving the ethics of intelligence education and capacity-building under-theorized. This article develops retrospective moral reappraisal (RMR): the delayed moral reclassification of earlier teaching as ethically compromised when political transition and new public knowledge recontextualize what that teaching may have enabled. It argues that RMR is a pathway to moral injury because the injurious event is later learning—not the original classroom act—that one’s contribution is now plausibly implicated in harm. Linking RMR to complicity and enabling under uncertainty, the article clarifies how foreseeability, professional role morality, and leverage shape responsibility without requiring causal certainty …

Best Practices For Managing Human–Beaver Conflicts In North America: Balancing Ecological Benefits And Human Interests, Alec J. Sundelius, Jerry Altermatt, Doug Brimeyer, Derek J. Broman, Jared Duquette, Cory Mosby, Falyn Owens, Shawn Rossler, David B. Ruid, Brian F. Wakeling, H. Bryant White

Human–Wildlife Interactions Monographs

We explore the complexities of managing beaver (Castor canadensis) conflicts in North America, describing the most common approaches used by natural resource management agencies to address conflicts. We identify specific conflicts caused by beavers, the ecological benefits beavers provide, and the tools commonly used to address conflicts. We discuss regional differences in beaver management strategies, including ecosystem restoration and conflict prevention. We specifically discuss a variety of management practices including public education, land use management, trapping, translocation, exclusion, shooting, dam removal, repellants, and harvest incentive programs; we then review the challenges and benefits of these tools. We discuss …

Hydroxyethyl Starch And Perioperative Complications: A Systematic Review And Meta-Analysis, Daniel I Sessler, Lorenzo Pradelli, Massimiliano Povero, Daniel Chappell, E Wang

Faculty, Staff and Student Publications

Background: Based on renal injury reported in critically ill and septic patients, the U.S. Food and Drug Administration issued a black box warning regarding hydroxyethyl starch (HES 130/0.4) use in 2013 and expanded the warning to surgical and trauma patients in 2021. Similarly, the European Medicines Agency initiated withdrawal of hydroxyethyl starch in 2022. This study was a new meta-analysis focused on renal injury designed to complement a 2021 meta-analysis of perioperative hydroxyethyl starch use, adding 45 trials and 6,895 patients. The focus was acute kidney injury and preoperative-to-postoperative change in creatinine concentration in surgical patients.

Methods: This study searched …

Fireproofing The Fda: Power, Politics, And Public Health, Daniel G. Aaron

Utah Law Review

On September 26, 2025, the S.J. Quinney College of Law hosted the Lee E. Teitelbaum Utah Law Review Symposium — Fireproofing the FDA: Power, Politics, and Public Health. The symposium is available on YouTube. Participants discussed problems longstanding and new in an attempt to chart a path for this vital agency. Topics included (1) What is the purpose of FDA?; (2) In what ways are the current Administration’s actions precedented or unprecedented?; (3) What is the current and ideal relationship between law and politics?; (4) How can law serve as an agent of public health?; and (5) How do we …

The Fda’S New Clinical Decision Support Software Guidance And Its Implications For Artificial Intelligence, Sara Gerke

Utah Law Review

Artificial Intelligence (AI) is transforming healthcare. While the U.S. Food and Drug Administration (FDA) has authorized the marketing of more than 1,400 AI-based products classified as devices under Section 201(h)(1) of the Federal Food, Drug, and Cosmetic Act, many other AIbased products, including certain clinical decision support (CDS) software tools that provide recommendations to health care professionals about diagnosis, treatment, or prevention of a disease or condition, have been placed on the U.S. market without FDA premarket review. On January 6, 2026, the FDA issued a revised CDS Guidance, which superseded the September 28, 2022 CDS Guidance. Shortly after, the …

Synthesis Of Fe-Doped Porous Carbon Catalyst Derived From Coconut Shell Waste Using Ferric Nitrate Nonahydrate (Fe(No3)3.9h2o) As An Iron Precursor, Ilham Lestadi Putra, Sukarni Sukarni, Heru Suryanto

Journal of Mechanical Engineering Science and Technology (JMEST)

Renewable energy from lignocellulosic biomass is a promising alternative to fossil fuels. Coconut shell (CS) waste is a favorable precursor for porous carbon due to its high carbon content, abundance, and non-food nature. However, conventional biochar often has limited surface area and catalytic active sites, hindering its effectiveness as a catalyst. While Fe-based modifications are promising, the use of ferric nitrate-assisted activation of coconut-shell-derived porous carbon remains underexplored. This research focused on developing an Fe-doped porous carbon catalyst from CS via ultrasound-assisted impregnation, followed by activation in a tube furnace. CS biochar was produced through pyrolysis at 550 °C and …

Girls’ Education Roadmap: 2026 Report, Meredith Kozak, Miriam Temin, Lina López-Lalinde, Amaranta Martinez Martinez

Adolescents and Young People

This Roadmap highlights where the gender and education field can align on coordinated action and investment to close critical gender gaps in education and improve learning for all. Building on findings from the original 2021 Girls’ Education Roadmap, it brings together data on the greatest gender and education needs, evidence on evaluated approaches, and where current practice reaches or misses vulnerable learners. From this foundation, the Roadmap organizes insights around 18 gender-related barriers to education, giving decision makers a framework for diagnosing context specific challenges and identifying proven approaches to address them.

Two-Dimensional Mo2b2tx Mbenes For Selective Sensing Of Disease-Associated Vocs In Cardiovascular Diagnostics, Puspamitra Panigrahi, Kulothungan Balasundaram, Yash Pal, Mukesh K. Choudhary, Hyeonhu Bae, Hoonkyung Lee, Ravindra Pandey, Akshaya Panigrahi, Tanveer Hussain

Michigan Tech Publications

Cardiovascular disease is a leading cause of global mortality, driving the need for non-invasive early detection methods. Analysis of specific volatile organic compounds (VOCs) in exhaled breath, such as acetone, hexane, hexanal, isoprene, and pentane, offers a promising diagnostic pathway. However, the selective detection of these low-concentration VOC biomarkers remains a significant challenge. This study employs a combination of theoretical approaches, such as density functional theory (DFT), STM-based tunnelling model aligned with the Tersoff-Hamann approximation, and thermodynamic analysis via the Langmuir adsorption model, to assess the sensing capabilities of two-dimensional (2D) MBenes (Mo2B2Tx) monolayers toward the targeted VOCs. The results …

The Pickleball Opportunity: A Case Study To Evaluate The Market Demand And Feasibility Of Opening A Private Pickleball Facility, Dene Williamson, Janet Jones

Global Sport Business Journal

This case study explores the market demand and financial feasibility of opening a privately owned, indoor pickleball facility in Warrensburg, Missouri. The central character, Mr. Dink, returns to his rural hometown with the goal of building a community-centric recreational space centered around America’s fastest-growing sport—pickleball. Students are asked to evaluate the business opportunity through comprehensive market research, financial forecasting, and risk assessment. Drawing from comparative data provided by an established facility in Florida, the case challenges students to adapt proven strategies to a smaller, lower-cost market. The case provides a platform to practice feasibility analysis, pricing strategy, break-even modeling, marketing, …

September 2026 Library & Learning Newsletter, Minnesota State University, Mankato. Library & Learning Dean's Office Communication Team

Library & Learning Newsletters

PDF version of the September 2026 (Volume 5, Issue 1) Library & Learning Newsletter.

Mda Insurance - Online Open Enrollment Now Available For Mda Health Plan, Craig Start

The Journal of the Michigan Dental Association

Craig Start, President of MDA Insurance, discusses health insurance planning for dental practices and families, introducing a new secure online open enrollment process through Employee Navigator for the MDA Health Plan. Running through October and November 2026, this online portal coordinates plan sponsors and employees to adjust coverage and add dependents. The article highlights other critical 2027 health coverage enrollment timelines, including individual marketplace plans and Medicare supplement choices, and emphasizes the personalized, cost-free advisory and claims advocacy services provided by MDA Insurance agents to support informed decision-making.

Patient-Centered Imaging In Dentistry, Erika Benavides Dds, Phd, Fabiana Naomi Soki, James R. Geist Dds, Ms, Angela M. Hoikka, Dds, Ms

The Journal of the Michigan Dental Association

This clinical feature discusses joint guidelines by the ADA and AAOMR for patient-centered dental radiography and cone-beam computed tomography (CBCT), emphasizing individual risk-based needs rather than routine schedules. It covers the principles of radiation safety: justification, optimization (ALARA/ALADA), and dose limitation. The article maps out specific imaging modalities recommended for caries, periodontal disease, endodontics, orthodontics, implants, and TMJ disorders. Additionally, it summarizes Michigan's administrative rules for X-ray installation shielding, equipment alignment, stable mechanical support, operator positioning, and the mandatory radiography training program requirements for dental assistants.

Mda Public Relations Grant Program Opens Applications For 2026 Cycle, Timothy Rath

The Journal of the Michigan Dental Association

The Michigan Dental Association is opening applications for its 2026 Public Relations Grant Program, offering individual grants of up to $5,000, with $30,000 in total funding, to support component dental societies. The program funds creative community-focused initiatives scheduled for 2027 that educate the public and promote oral health, excluding purely charitable clinical care. Eligible projects emphasize relationship-building and community engagement. Highlighted success stories from previous cycles include oral health kit distributions, youth-focused educational events, and the expansion of the 'Give Kids A Smile' exams and preventive care clinics across Michigan.

Toward Equitable Energy Futures: The Influence Of Digital Government And Financial Development On Clean Energy Justice, Martin Spraggon, Muhammad Hafeez, Sana Ullah, Chanyanan Somthawinpongsai, Zurul Aisya Osman, Sidra Sohail

All Works

Fossil fuel energy is the largest source of carbon emissions and the main driver of climate change and global warming. Therefore, the world is switching towards clean and green energy sources as an alternative to fossil fuel-based energy sources. Nevertheless, the equitable distribution of clean energy resources in urban and rural areas among every segment of society has become a concern for policymakers. Thus, urban-rural clean energy justice is an investigation topic that needs our attention. In this analysis, our main focus is on investigating the influence of financial development and digital government on clean energy justice using an advanced …

A Worldwide Cross-Sectional Survey Seeks The Current Global Practice Patterns On Perioperative Management In Elective Shoulder Replacement Surgery, Maciej Simon, Farhad Moola, Jennifer Coghlan, Osvandre Lech, Carlos Ramos, Njalalle Baraza, Hadrian Platzer, Simone Gantz, Andreas Seekamp, Babak Moradi

General Surgery, East Africa

Background Perioperative management in elective shoulder arthroplasty varies widely, with no universal consensus on best practices. This study aimed to characterize current global standards of perioperative care, including pre-operative, intraoperative, and post-operative management, among orthopedic surgeons performing elective shoulder replacement surgery, with the aim of contributing to a global standard of care.

Methods A comprehensive online questionnaire was designed and anonymously distributed to orthopedic societies on each continent. Participants were cross-sectionally surveyed with the goal of identifying current global pre-operative, intraoperative, and post-operative practices in patient care and discharge management.

Results Eighteen societies from 5 continents participated in the survey. …

Diffusion-Informed Joint Segmentation Enhances Detection Of Thalamic Atrophy In Parkinson’S Disease, Gozde Kizilates-Evin, Ani Kicik, Emel Erdogdu, Dilek Betul Saridede, Sevim Cengiz, Basar Bilgic, Hasmet A. Hanagasi, Esin Ozturk-Isik, Tamer Demiralp, Ali Bayram

All Works

The thalamus is a critical subcortical hub that relays sensorimotor information and regulates higher-order cognitive processes. Accurate delineation of thalamic nuclei is essential for elucidating disease mechanisms and tracking clinical progression. In this study, we compared two segmentation approaches implemented in FreeSurfer: the conventional structural method and a joint framework that integrates diffusion tensor imaging. Magnetic resonance imaging (MRI) data from 24 healthy controls (HC), 27 patients with cognitively normal Parkinson’s disease (PD-CN), and 33 Parkinson's disease patients with mild cognitive impairment (PD-MCI) were analyzed. Segmentation methods were compared in HC to assess their effect on volume estimates. Group comparisons …

Dustmambanet: A Hybrid Inceptionv3–State-Space Network For Robust Solar Panel Dust Detection, Kadhim Hayawi, Sakib Shahriar

All Works

To develop a robust, scalable vision-based model for automatic detection and quantification of dust accumulation on solar photovoltaic panels, overcoming limitations of existing convolutional and attention-based methods and supporting proactive maintenance. We propose DustMambaNet, a hybrid model that consists of a pretrained InceptionV3 convolutional neural network as a feature extractor and two selective state space sequence modules. The state space modules use gated depthwise convolutions to represent long-range spatial dependencies that are of linear complexity, after rearranging spatial features to form sequences. The network provides a binary classification of dust with a severity index (DSI) and a continuous one. All …