Digital Commons Network^™

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 Families Of Finsler Metrics, İsmai̇l Sağlam, Ken'ichi Ohshika, Athanase Papadopoulos

Turkish Journal of Mathematics

In this paper, we answer some natural questions concerning symmetrisation and more general combinations of Finsler metrics, with a view to applications to Funk and Hilbert geometries and metrics on Teichmüller spaces. The metrics on Teichmüller space that we consider are the Thurston metric and the earthquake metric, both introduced by Thurston. The first metric has been thoroughly studied over the last couple of decades, and the second over the last few years. The Funk metric and its symmetrisation, the Hilbert metric, are classical metrics that have been investigated in the contexts of hyperbolic geometry and geometric function theory and, …

On The Monoid Of Partial Order-Preserving Transformations Of A Finite Chain Whose Domains And Ranges Are Intervals, Hayrullah Ayik, Vítor H. Fernandes, Emrah H. Korkmaz

Turkish Journal of Mathematics

In this paper, we consider the monoid PIO_n of all partial order-preserving transformations on a chain with n elements whose domains and ranges are intervals, along with its submonoid PIO_n⁻ of order-decreasing transformations. Our main aim is to give presentations for PIO_n⁻ and PIO_n. Moreover, for both monoids, we describe regular elements and determine their ranks, cardinalities and the numbers of idempotents and nilpotents.

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 …

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.

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.

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 …

​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.

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 …

Digital Commons Statistics For September 2026, Liberty University

Digital Commons Statistics

No abstract provided.

Eco Contemporáneo Magazine: Translation And Counterculture From 1960´S Buenos Aires, Damían Deamici

INTI: Revista de literatura hispánica

No abstract provided.

Paisajes Peruanos Transcontinentales: Mario Vargas Llosa. Paisajes Peruanos Translinguales: Daniel Alarcón, Ottmar Ette

INTI: Revista de literatura hispánica

No abstract provided.

Luigi Giuseppe (Giorgio)1 Racca Y Oreste Sola: Dos Piamonteses En Argentina En La Época De La Inmigración Masiva, María Teresa Sanhueza

INTI: Revista de literatura hispánica

No abstract provided.

Vargas Llosa Y El Fuego De La Tribu, Julio Ortega

INTI: Revista de literatura hispánica

No abstract provided.

Cuatro Microrrelatos, Javier De Nevascués

INTI: Revista de literatura hispánica

No abstract provided.

Gene-Environment Interactions In Cardiovascular Aging: Volunteering, Polygenic Risk, And Biomarker Change In European And African Ancestry Populations, Seoyoun Kim, Byeongju Ryu, Erin Ware, Koichiro Shiba, Cal J. Halvorsen

Brown School Faculty Publications

Volunteering has been associated with better cardiovascular health, but whether this association varies by genetic susceptibility to cardiovascular disease remains unclear. This study examined associations between volunteering and cardiovascular biomarkers, assessed associations between biomarker-specific polygenic scores (PGSs) and these outcomes, and tested whether polygenic risk moderated volunteering–biomarker associations among U.S. adults aged 51 years and older.

The Influence Of Childhood Experiential History On U.S. Vice President Jd Vance’S Personality, Amelia Brower, Aubrey Immelman

Psychology Faculty Publications

This paper presents the results of a developmental causal analysis of the adult personality of U.S. vice president JD Vance, from the conceptual perspective of personologist Theodore Millon.

Psychodiagnostically relevant data relating to Vance’s personality were collected from biographical sources and media reports and synthesized into a personality profile using the Millon Inventory of Diagnostic Criteria (MIDC), which yields 34 normal and maladaptive personality classifications congruent with DSM-III-R, DSM-IV, and DSM-5-TR.

The findings of the personality assessment were previously reported in a separate paper. Vance’s primary personality patterns were found to be Dominant/controlling and Ambitious/confident, supplemented by …

Joint Identification Method Of Distribution Network Topology And Line Parameters Based On Sparse Regression And Clustering Correction, Ruifeng Zhang, Bo Li, Kai Liao, Xueshun Ye, Jun Zhou, Lei Wu

Journal of Electric Power Science and Technology

The inconsistency between equipment records and actual topology/line parameters during the long-term operation of distribution networks seriously limits the safe and efficient operation of distribution networks.To this end，a joint identification method for distribution network topology and line parameters based on sparse regression and clustering correction is proposed.Firstly，the coupling relationship between measurement data and distribution network topology/line parameters is analyzed to build the joint identification model.Subsequently，a preliminary topology identification-line parameter calculation-joint precision identification method is introduced to pre-identify topology by employing voltage similarity.Then，line parameters are solved via sequential backward selection and sparse regression，and accurate topology is extracted through an improved spatial …

Design And Analysis Of Power Supply Transmission For Lunar Surface Energy System, Ming Zhang, G Jiankun Zhan, Yuxiang Yang, Chengxiong Tang, Lijun Ma, Ji ’Nan Ma, Hong Du, Hua Geng, Yu Zhao

Journal of Electric Power Science and Technology

The energy system is an important component of the lunar research station ’s infrastructure and is responsible for providing long-term，stable electric power.Based on the construction stages and mission requirements of the lunar research station，this paper briefly introduces the composition of the energy system，proposes an energy transmission topology architecture based on a distributed system，and establishes mathematical models for the power conversion and transmission links.Considering the characteristics of AC and DC systems，as well as factors such as system weight，reliability，and the application of space high-voltage technologies，this paper compares and analyzes the characteristics of transmission buses under different systems，voltage levels，and transmission power levels，determines the …

Longstanding Mental Representations Of Familiar Faces, Sarah Laurence, A. Mike Burton, Camilla During, Jennifer Pink, Lucy Wilson, Mila Mileva

School of Psychology

As we recognise people we know over many years, their faces can change, sometimes profoundly, and yet we continue to recognise them with ease. How do we update our representations over time? We present four pre-registered experiments to examine this. In Experiment 1, using likeness ratings and speeded name verification, fans of a long-running TV soap opera demonstrated that their representations of the characters’ faces were weighted towards their most recent encounters – when the characters were oldest. While we initially hypothesised that this was due to recency, Experiment 2 showed this not to be the case. When new participants …

Directing The Absent Tool: Friction Embodiment And Competency Progression In Ai Assisted Creative Learning, Daniel Suarez, James Hutson

Faculty Scholarship

Generative artificial intelligence complicates the relationship between successful creative production and the development of independent disciplinary judgment. Task allocation offers a practical response by identifying operations that learners should protect, perform with support, or delegate, yet the educational value of an allocation depends on conditions that change beyond a single assignment. This article extends a process-centered framework along three connected axes: absence, modality, and time. Constructivist friction describes difficulty encountered when learners must reconstruct judgments previously supplied by an available tool; its educational value depends on subsequent diagnosis, feedback, and transfer rather than difficulty alone. A spatial and embodied extension …

Vulnerability Assessment Of Power Grid Nodes Based On Moo-Gcn, Kang Xing, Ziqing Zhang, Qunmin Yan, Jingjing Tian

Journal of Electric Power Science and Technology

The continued expansion and increasing structural complexity of new power systems have made the limitations of traditional node vulnerability analysis methods increasingly evident in terms of computational efficiency，nonlinear feature analysis capability，and assessment accuracy.To address this issue，a power grid node vulnerability assessment method based on a multi-objective optimization graph convolutional network （MOO-GCN ） was first proposed.Then，a multi-objective optimization mechanism was introduced into the traditional GCN framework to construct a three-component joint loss function integrating reconstruction loss，neighborhood embedding loss，and ranking consistency loss，thus achieving comprehensive assessment through dynamic weight adjustment.Finally，the IEEE 300-node，IEEE 500-node，and IEEE 1354 -node distribution networks were used as test cases，and …

Wide-Area Optimal Control Method For Synchronous Generators To Enhance Transient Voltage Stability Of Receiving-End Grids, Peng Wang, Chenyi Zheng, Qing Wang, Yi Tang

Journal of Electric Power Science and Technology

Synchronous generators are important reactive power sources in DC receiving-end grids.However，the traditional automatic excitation voltage regulation method，which controls reactive power output solely according to the voltage drop at the generator terminal，fails to fully exploit the reactive power and voltage regulation potential of synchronous generators.To address this issue，a wide-area optimal control framework and method for synchronous generators are proposed to enhance the transient voltage stability of receiving-end grids.First，fault scanning was conducted based on typical operating conditions，and voltage-weak nodes in the receiving-end grid were identified according to the nodal voltage-drop time-area and transient voltage stability margin.Second，the reactive power support capability of each …

Cause Analysis Of Low Voltage In Distribution Networks Based On Multi-Scale Time-Frequency Features And Global Dependency Modeling, Peng Chen, Sihan Zhou, Liping Fan, Xiaosheng Yu

Journal of Electric Power Science and Technology

A cause analysis model based on multi-scale time-frequency features and global dependency modeling is proposed to improve the accuracy and robustness of cause classification and address the complex and diverse causes of low voltage in distribution networks and the non-stationary nature of signal characteristics.The model consists of two feature extraction branches：the wavelet convolution branch employs one-dimensional discrete wavelet convolution to extract multi-scale time-frequency features and capture the local dynamic variations of the signals；the Transformer branch converts the time-series data into a recursive graph and models global temporal dependency through the self-attention mechanism.Subsequently，local and global features are integrated through feature fusion …

Multi-Entity Multi-Measure Combined Line-Loss Control For Active Distribution Networks, Haiyun An, Yufang Liu, Qian Zhou, Jiaxun Li

Journal of Electric Power Science and Technology

The large-scale integration of diverse entities，including wind power，photovoltaic generation，and energy storage，has transformed distribution networks from traditional passive networks into active bidirectional networks.While helping alleviate energy and environmental crises，this transformation also poses significant challenges to line-loss control in active distribution networks （ADNs ）.To address this issue，this paper proposes a multi-measure combined line-loss control method considering the participation of multiple entities.First，various loss-reduction measures，including distribution line upgrading，transformer replacement，and reactive power compensation，are considered comprehensively.A multi-objective optimization model accounting for both loss-reduction effectiveness and economic performance is established，with optimal economic operation of the ADN as the objective and secure operation of the distribution network with …

Calculation Method For Distribution Network Line Loss Based On Feature Selection And Lstm-Xgboost-Shap, Li Yang, Guo Wang, Yongzhi Min

Journal of Electric Power Science and Technology

Accurately calculating distribution network line losses is crucial for ensuring the economic，safe and stable operation of the power system.The conventional calculation methods cannot effectively utilize electrical feature parameters and involve cumbersome calculation procedures.To address this issue，the study proposes an interpretable calculation method for distribution network line loss based on electrical feature selection and a hybrid model integrating long short-term memory （LSTM ） and extreme gradient boosting-SHapley Additive exPlanations （XGBoost-SHAP ）.In this method，theoretical electrical feature indicators for line loss are determined by comprehensively considering the relationships between various electrical parameters and distribution network line losses.A feature selection method based on cross-correlation …

Fault Line Selection Method For High-Resistance Ground Faults In Asymmetric Distribution Networks With Ne Utral Point Voltage Source Connection, Tao Tang, Silin Xiang, Qilong Rong, Kangjian Yuan

Journal of Electric Power Science and Technology

A fault line selection method based on neutral point voltage source connection for single-phase high-resistance ground faults is proposed to address the challenge of single-phase high-resistance ground fault identification in asymmetric distribution networks.Firstly，the zero-sequence current component characteristics of lines in asymmetric distribution networks are analyzed，and an equivalent model for the zero-sequence network of asymmetric distribution networks is built.Secondly，when the zero-sequence voltage exceeds its limit，a high-frequency voltage source is connected to the system neutral point，with the influence of asymmetric parameters of each line eliminated by calculating the asymmetric current.The ratio of the power frequency component to the high-frequency component of the …