bluuebunny/crossref_metadata_2025 huggingface dataset:
Fayet–Iliopoulos terms in supergravity and D-term inflation by supersymmetry breaking
Authors: Antoniadis Ignatios , Chatrabhuti Auttakit , Isono Hiroshi
Published: October 2023

We review recent developments on Fayet–Iliopoulos terms in four-dimensional supergravity and discuss their applications to natural models of inflation driven by supersymmetry breaking with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton.
Non-Lorentzian Jackiw–Teitelboim supergravity
Authors: Zorba Utku
Published: October 2023

We will review the non-Lorentzian (nonrelativistic and ultrarelativistic) Jackiw–Teitelboim supergravity theories, which are the limits of relativistic Jackiw–Teitelboim supergravity. The construction is based on BF theory formalism and also the extended Newton–Hooke and extended AdS Carroll superalgebras in two space–time dimensions. It is also shown that nonrelativistic and ultrarelativistic supergravity actions are related to each other by a map which is shown explicitly in this review. This is supersymmetric version of Galilei/Carroll duality in two dimensions.
Decomposition and the Gross–Taylor string theory
Authors: Pantev Tony , Sharpe Eric
Published: October 2023

It was recently argued by Nguyen, Tanizaki and Ünsal that two-dimensional pure Yang–Mills theory is equivalent to (decomposes into) a disjoint union of (invertible) quantum field theories, known as universes. In this paper, we compare this decomposition to the Gross–Taylor expansion of two-dimensional pure [Formula: see text] Yang–Mills theory in the large-[Formula: see text] limit as the string field theory of a sigma model. Specifically, we study the Gross–Taylor expansion of individual Nguyen–Tanizaki–Ünsal universes. These differ from the Gross–Taylor expansion of the full Yang–Mills theory in two ways: a restriction to single instanton degrees, and some additional contributions not present in the expansion of the full Yang–Mills theory. We propose to interpret the restriction to single instanton degrees as implying a constraint, namely that the Gross–Taylor string has a global (higher-form) symmetry with Noether current related to the worldsheet instanton number. We compare two-dimensional pure Maxwell theory as a prototype obeying such a constraint, and also discuss in that case an analogue of the Witten effect arising under two-dimensional theta angle rotation. We also propose a geometric interpretation of the additional terms, in the special case of Yang–Mills theories on 2-spheres. In addition, also for the case of theories on 2-spheres, we propose a reinterpretation of the terms in the Gross–Taylor expansion of the Nguyen–Tanizaki–Ünsal universes, replacing sigma models on branched covers by counting disjoint unions of stacky copies of the target Riemann surface, that makes the Nguyen–Tanizaki–Ünsal decomposition into invertible field theories more nearly manifest. As the Gross–Taylor string is a sigma model coupled to worldsheet gravity, we also briefly outline the tangentially related topic of decomposition in two-dimensional theories coupled to gravity.
Relativistic superconductivity in 2D: An example
Authors: Bruce Stanley A.
Published: October 2023

Recently, we formulated an effective scalar electrodynamics model of relativistic type-II superconductivity. We discussed possible electromagnetic behaviors of superconductivity along the lines of the nonrelativistic Ginzburg–Landau theory. This brief work considers a [Formula: see text]D condensate subjected not only to a homogeneous magnetic field but also to a static radial electric field (polar coordinates). The electric field is regarded to have two components: a central constant field and a Coulomb-like field with “charge” g, where g can take only evenly spaced real numbers. We provide the single-vortex supercurrent density together with its associated magnetic flux density for the ground state of the system. Feasible extensions of this example in [Formula: see text]D curvilinear geometries could explain some superconductivity phenomena which do not occur in planar [Formula: see text]D geometries.
A first-principles study of mechanical, thermodynamics, optical, and thermoelectric characteristics of hexagonal CsGeX3 (X=Cl, Br, I) Perovskites
Authors: Maskar E. , Lamrani A. Fakhim , Belaiche M. , ES-SEMYHY Mountaser , Khuili M. , Prasad Mattipally , Sivakumar J. , Laref Amel , Rai D. P.
Published: October 2023

In this research, we have employed the Density Functional Theory (DFT) to successfully study the structural, elastic, thermoelectric, and optoelectronic properties of hexagonal halide perovskites CsGeX3 ([Formula: see text], Cl, and Br). We used the Modified Becke–Johnson (MBJ-GGA) potential approximation to profoundly describe the band structure. The compounds of this interesting study are ductile, anisotropic, and mechanically stable. Our study showed that the optical properties are significant, among which are the following: the absorption is higher in the ultraviolet range, and the transmittance reaches a maximum level, which is 80% in the visible and infrared ranges. These substances can be employed in various optoelectronic systems that work in visible and ultraviolet energies. Furthermore, the transport properties are remarkably improved and reached the ZT [Formula: see text]. These characteristics proved that they have an interesting potential for thermoelectric uses. We emphasized that this study provided the theoretical foundation of these structures’ elastic, electronic, and optical properties.
Design and Analysis of Active Feedback RGC-Based Transimpedance Receiver Circuit for Optical Interconnects
Authors: Singh Amoldeep , Sandha Karmjit Singh , Rai Mayank Kumar
Published: October 2023

A Transimpedance amplifier (TIA)-based optical receiver in active voltage-current feedback topology is designed for optical interconnects at 0.18 [Formula: see text] CMOS technology. The proposed inductorless TIA incorporates a gain boosting amplifier in its path to achieve high gain and bandwidth. This gain boosting amplifier is based on a regulated gain cascode (RGC) amplifier. The RGC stage raises the [Formula: see text] of the circuit, reducing the input resistance of the input stage; as a result, the bandwidth extends. To further amplify the gain, a common source (CS) stage is used at the output without much effect on the system’s overall bandwidth. An analytical model of the proposed TIA is developed and later simulated at room temperature in the Cadence Virtuoso analog design environment. The pre-layout and post-layout simulation results of the proposed TIA have been shown to validate its performance. It achieves a transimpedance gain of 62 [Formula: see text] while consuming power of 14.5 mW from a 1.8 V supply voltage. The bandwidth is extended to 8.2 GHz from 1.83 GHz with an input photodiode capacitance of 300 fF. The current spectral density of input-referred noise is 31 pA/[Formula: see text].
Review and Application of Knowledge Graph in Crisis Management
Authors: Wang Xinzhi , Li Mengyue , Chen Weiwang , Yao Yige , Li Zhennan , Liu Yi , Zhang Hui
Published: October 2023

In the contemporary social environment, social crisis events occur frequently with significant impacts. Effective management of these events requires comprehensive group intention mining, which encompasses intention detection and intention attribution. Knowledge graph inference facilitates the detection of group intention in crisis events. This is supported by the construction of crisis knowledge graphs, which organize crisis elements and inter-element relations into structured semantic information. This paper provides a comprehensive overview of the research about knowledge graph in social crisis management, focusing on three key areas: knowledge graph construction and inference, knowledge graph-based interpretable crisis attribution, and risk management. Specifically, the interpretable semantics in crisis knowledge graphs enables attribution of intention. To illustrate the significance of knowledge graphs in group intention mining, the COVID-19 and China–US game events are selected as two case studies. Finally, the paper proposes future research directions to solve the limitations of existing knowledge graph-related methods in social crises.
OdegVul: An Approach for Statement-Level Defect Prediction
Authors: Yin Guoqiang , Wang Wei , Li Haiyan
Published: October 2023

Defect prediction research has been conducted for more than 40 years, with the goal of estimating the defect-prone blocks of source code. Prior studies, however, had two major limitations: (1) coarse-grained defect prediction results and (2) weak long-term dependencies modeling. As a result, developers need to review the prediction results to figure out which function or even which line of code produced the issue. In this study, we present OdegVul, a novel statement-level defect prediction model, to address these concerns. To capture both semantic and structural relationships between statements, a statement representation framework combining deep learning and graph neural networks is designed. Then the long-term dependencies between statements are encoded as a partial differential equation of a graph neural network. Through the experiment of 32 releases of 9 open-source Java projects, we found that semantic and structural dependencies are crucial to statement-level defect prediction. OdegVul outperforms other state-of-the-art (SOTA) predictors and achieves reasonable performance in cross-project statement-level defect prediction scenarios. The finer granularity of predicting results reduces the developer’s workforce in reviewing the prediction results and increases the practicality of the defect prediction model. The source code of OdegVul is available at https://github.com/CoderYinDaqiang/OdegVul .
Drake equation of search for extraterrestrial intelligence: A proposal for modification in the light of Dirac’s large number hypothesis
Authors: Ray Saibal , Ray Soham , Al-Amri Issa S. , Maurya S. K. , Manith Banula K. P.
Published: October 2023

In the light of Dirac’s Large Number Hypothesis (LNH), we try to relate the Drake equation with the extra-terrestrial intelligence (ETI), specifically in terms of cognitive science. This argument has been drawn from the ratio of smallest time scale (i.e. 40[Formula: see text]Hz oscillation in neuronal system of brain) to the smallest timescale (i.e. the Planck time in the present universe) which provides a very large dimensionless number [Formula: see text]. Under this LNH, we emphasize on the issue of the alien equation of Drake and provide a modified version of it by considering consciousness of the ETI. Thus, the Drake equation, which basically represents a statistical conjecture with random and arbitrary values, can be related with a feasible as well as applicable background philosophy.
Colliding fields in two-dimensional dilaton gravity background
Authors: Halilsoy Mustafa , Hsieh Chia-Li
Published: October 2023

The ([Formula: see text])-dimensional dilatonic background geometry of [C. Callan, S. Giddings, J. Harvey and A. Strominger, Phys. Rev. D 45 (1992) R1005] admits an infinite class of colliding wave solutions. We give examples from real and ghost fields with bounded/ unbounded profiles. In particular, colliding ghost fields in the “lineland” geometry create particle-like wormholes. Such wormholes, however, collapse to a black hole whenever the supporting ghosts turn off. Lastly, it is shown that the vacuum collision of null fields yields a ghost wormhole which is unstable.
EFFECT OF KINESIO TAPING IN SUBJECTS WITH UPPER QUADRANT POSTURAL DYSFUNCTION: A SYSTEMATIC REVIEW AND META-ANALYSIS
Authors: Niranjan Lankipalli , Harikesavan Karvannan , Kalyan Hemant K.
Published: October 2023

Purpose: Kinesio taping is most widely used to correct postural dysfunction. Forward head and rounded shoulder posture (RSP) are common postural dysfunctions in the upper quadrant. Despite claims that Kinesio taping can be used to correct upper quadrant postural dysfunction, this seems to be controversial. Thus, our purpose is to determine the effect of Kinesio taping in subjects with upper quadrant postural dysfunction.

Methods: The electronic databases searched include PubMed, EMBASE, Scopus, Cochrane and PEDro were searched from April 2001 to April 2023. Studies searched were included if they met the eligibility criteria. The Cochrane Collaboration’s tool was used to assess the risk of bias. RevMan 5.3 software was used for meta-analysis.

Results: Nine RCTs involving 293 participants were included. The present meta-analysis demonstrated significant differences between Kinesio taping groups and control groups in terms of forward shoulder angle (FSA). No significant difference was found regarding craniovertebral angle (CVA) and pain.

Conclusion: In subjects with RSP, Kinesio taping is beneficial in correcting FSA and does not show improvement in CVA and pain. The findings of this meta-analysis should be interpreted with caution due to the low quality of the evidence.
PREVALENCE AND RISK FACTORS OF MUSCULOSKELETAL DISORDERS AMONG NURSES WORKING AT A TERTIARY HOSPITAL IN OMAN
Authors: Alabri Tharaya , Al Harrasi Maryam , Al Jahwari Marwah , Al Amri Jahina , Al Najidiya Hajar , Al Saadi Ghith , Al Maskari Ahmed
Published: October 2023

Background: Musculoskeletal disorders (MSDs) are a major cause of concern for workplace safety for healthcare workers. The prevalence of nurses with MSDs is particularly high. The aim of this study is to evaluate the prevalence and explore the associated factors of MSDs among nurses working in a tertiary hospital in Oman.

Methods: A cross-sectional, descriptive correlational study was used to examine 125 nurses using the Standardized Nordic Questionnaire.

Results: We sampled 125 nurses working in different units. We found that the main age group is between 31 and 40 years old (58.4%), mostly female (79.2%), majority are married (80.8%) and have children (76.8%). Nurses in this sample work at different departments, majority are working in the orthopedic unit (18.4%). The minimum years of experience was 1 year, and the maximum was 33 years. Upper back pain was the most reported complaint (7.2%). Out of the 125 nurses 87 had symptoms of MSDs at a prevalence of 0.696. Three factors were found to have a relationship with workplace-related MSDs: working in the same position for long periods of time ([Formula: see text] = 0.007), having lift-and-transfer- dependent patients ([Formula: see text] = 0.023), and being forced to work harder under the condition of staff shortage ([Formula: see text] = 0.062). None of the demographic and work-related characteristics were found to be related to MSDs.

Conclusion: MSDs are very prevalent among nurses in Oman. The factors of developing MSDs are work related regardless of the demographic or workplace characteristics. Healthcare institutions shall implement preventive and rehabilitative measures to help nurses have better musculoskeletal health.
MUSCULOSKELETAL PAIN AND ITS NOCICEPTIVE OR NEUROPATHIC CHARACTERIZATION AMONGST NIGERIANS WITH TYPE 2 DIABETES MELLITUS
Authors: Oyewole Olufemi O. , Ale Ayotunde O. , Adepoju Ayanbola I. , Emmanuel Grace M. , Odusan Olatunde
Published: October 2023

Purpose: The study determined the burden and characterized MSP among Nigerians with Type 2 Diabetes (T2DM) into nociceptive or neuropathic pain.

Methods: A cross-sectional study of 207 consecutively recruited T2DM subjects to assess and characterize MSP as neuropathic or nociceptive with the use of Nordic Musculoskeletal and S-LANSS standardized Questionnaires.

Results: Of the 207 participants, there were 147 (71%) females with mean age of 59.7± 11.7 years. About 94.2% and 79.2% reported pain in at least one joint within 12 months and 7-day preceding the study, respectively. Ankle/foot is the most common site/region of reported pain in both the preceding 12 months and 7-day (58.5% versus 49.5%) while the least over the same period was at the elbow (22.6% versus 12.6%). Only 48.3% of the participants had restrictions in their activities of daily living (ADL) with 62.3% received treatment for self-reported pain. MSP was characterized predominantly as neuropathic among 27.5% of the participants which was highest among participants (36%) whose ADL were limited because of MSP.

Conclusion: High prevalence of MSP was found among Nigerians with T2DM, more commonly reported in the ankle/foot region of the body with one in every five classified as neuropathic pain.
Searching for Assets to Hedge Against Inflation in the U.S. Market
Authors: Chiang Thomas C.
Published: October 2023

This paper provides evidence regarding the relationship between asset returns and (expected) inflation in the U.S. market. Evidence indicates that inflation has a negative effect on stocks, REIT and bonds. However, its effect on housing and gold assets is positive. Evidence concludes both housing and gold tend to show a positive correlation with inflation. This study finds that inflation causes equity market volatility due to investors’ fears about the possibility of interest rate hikes by the Fed, which further aggravates the price of stocks and REIT, but helps to improve bond prices due to a flight-to-quality effect.
Brezis–Seeger–Van Schaftingen–Yung-type characterization of homogeneous ball Banach Sobolev spaces and its applications
Authors: Zhu Chenfeng , Yang Dachun , Yuan Wen
Published: October 2023

Let [Formula: see text] and [Formula: see text] be a ball Banach function space satisfying some extra mild assumptions. Assume that [Formula: see text] or [Formula: see text] is an [Formula: see text]-domain for some [Formula: see text]. In this paper, the authors prove that a function [Formula: see text] belongs to the homogeneous ball Banach Sobolev space [Formula: see text] if and only if [Formula: see text] and [Formula: see text] where [Formula: see text] is related to [Formula: see text]. This result is of wide generality and can be applied to various specific Sobolev-type function spaces, including Morrey [Bourgain–Morrey-type, weighted (or mixed-norm or variable) Lebesgue, local (or global) generalized Herz, Lorentz, and Orlicz (or Orlicz-slice)] Sobolev spaces, which is new even in all these special cases; in particular, it coincides with the well-known result of H. Brezis, A. Seeger, J. Van Schaftingen, and P.-L. Yung when [Formula: see text] with [Formula: see text], while it is still new even when [Formula: see text] with [Formula: see text]. The novelty of this paper exists in that, to establish the characterization of [Formula: see text], the authors provide a machinery via using the generalized Brezis–Seeger–Van Schaftingen–Yung formula on [Formula: see text], the extension theorem on [Formula: see text], the Bourgain–Brezis–Mironescu-type characterization of the inhomogeneous ball Banach Sobolev space [Formula: see text], and the method of extrapolation to overcome those difficulties caused by that [Formula: see text] might be neither the rotation invariance nor the translation invariance and that the norm of [Formula: see text] has no explicit expression.
Fast-reaction limit of reaction–diffusion systems with nonlinear diffusion
Authors: Crooks Elaine , Du Yini
Published: October 2023

In this paper, we present an approach to characterizing fast-reaction limits of systems with nonlinear diffusion, when there are either two reaction–diffusion equations, or one reaction–diffusion equation and one ordinary differential equation, on unbounded domains. Here, we replace the terms of the form [Formula: see text] in usual reaction–diffusion equation, which represent linear diffusion, by terms of form [Formula: see text], representing nonlinear diffusion. We prove the convergence in the fast-reaction limit [Formula: see text] that is determined by the unique solution of a certain scalar nonlinear diffusion problem.
Global classical solutions for three-dimensional compressible isentropic magneto-micropolar fluid equations with Coulomb force and slip boundary conditions in bounded domains
Authors: Liu Yang , Zhong Xin
Published: October 2023

In this paper, we study an initial-boundary value problem of three-dimensional (3D) compressible isentropic magneto-micropolar fluid equations with Coulomb force and slip boundary conditions in a bounded simply connected domain, whose boundary has a finite number of two-dimensional connected components. We derive the global existence and uniqueness of classical solutions provided that the initial total energy is suitably small. Our result generalizes the Cauchy problems of compressible Navier–Stokes equations with Coulomb force [S. Liu, X. Xu and J. Zhang, Global well-posedness of strong solutions with large oscillations and vacuum to the compressible Navier–Stokes–Poisson equations subject to large oscillations and non-flat doping profile, J. Differ. Equ. 269 (2020) 8468–8508] and compressible MHD equations [H. Li, X. Xu and J. Zhang, Global classical solutions to 3D compressible magnetohydrodynamic equations with large oscillations and vacuum, SIAM J. Math. Anal. 45 (2013) 1356–1387] to the case of bounded domains although tackling many surface integrals caused by the slip boundary condition are complex. The main ingredient of this paper is to overcome the strong nonlinearity caused by Coulomb force, magnetic field, and rotation effect of micro-particles by applying piecewise-estimate method and delicate analysis based on the effective viscous fluxes involving velocity and micro-rotational velocity.
The Bernstein problem for (X,Y )-Lipschitz surfaces in three-dimensional sub-Finsler Heisenberg groups
Authors: Giovannardi Gianmarco , Ritoré Manuel
Published: October 2023

In the Heisenberg group [Formula: see text] with a sub-Finsler structure, an [Formula: see text]-Lipschitz surface which is complete, oriented, connected and stable must be a vertical plane. In particular, the result holds for entire intrinsic graphs of Euclidean Lipschitz functions.
A bialgebra theory for transposed Poisson algebras via anti-pre-Lie bialgebras and anti-pre-Lie Poisson bialgebras
Authors: Liu Guilai , Bai Chengming
Published: October 2023

The approach for Poisson bialgebras characterized by Manin triples with respect to the invariant bilinear forms on both the commutative associative algebras and the Lie algebras is not available for giving a bialgebra theory for transposed Poisson algebras. Alternatively, we consider Manin triples with respect to the commutative 2-cocycles on the Lie algebras instead. Explicitly, we first introduce the notion of anti-pre-Lie bialgebras as the equivalent structure of Manin triples of Lie algebras with respect to the commutative 2-cocycles. Then we introduce the notion of anti-pre-Lie Poisson bialgebras, characterized by Manin triples of transposed Poisson algebras with respect to the bilinear forms which are invariant on the commutative associative algebras and commutative 2-cocycles on the Lie algebras, giving a bialgebra theory for transposed Poisson algebras. Finally the coboundary cases and the related structures such as analogues of the classical Yang–Baxter equation and [Formula: see text]-operators are studied.
Adaptive Excitation Frequency Matching and Acoustic-Feature-Based Automatic Hammering Inspection System
Authors: Huang Huang , Huang Xi , Wu Zhishen , Alhebrawi Mohamad Najib , Liang Zhishui
Published: October 2023

Hammering tests are employed for detecting surface and internal damage; however, their accuracy depends on the experience and expertise of inspectors. Because automation techniques can address the limitations of manual hammering tests, researchers have developed automatic hammering inspection systems to replace or assist conventional hammering inspection. Although several studies on automatic hammering inspection have been reported, several challenges hinder the practical application of their results. The relative hammering frequency and identification algorithms for complex and diverse damage are critical factors in implementing developed techniques. In a previous study, an automatic hammering inspection device for rapid and automated damage detection in practical applications was developed. This device can remotely adjust the hammering angle and force to increase detection accuracy and efficiency. Furthermore, an artificial-intelligence-enhanced damage identification method was developed to identify fine concrete cracks accurately using acoustic data. This study developed an automatic hammering inspection system with an adaptive matching function and automatic damage identification to increase the accuracy and efficiency of damage detection. First, by imitating human auditory judgment, an adaptive matching algorithm for the excitation frequencies of different damage types was developed to determine the optimal excitation frequency. Second, the relationships between acoustic features and damage information were analyzed. Finally, two concrete specimens with artificial damage were tested using the proposed system, with the relationships between the acoustic features in the time and frequency domains, as well as the damage location and depth, investigated experimentally. The results show that the proposed system can accurately identify surface and internal damage distributions up to a depth of 100[Formula: see text]mm at 20[Formula: see text]mm intervals.
Influences of External Magnetic Field on Thermo-Mechanical Vibration Analysis of Nanocomposite Beam using Higher-Order Strain Gradient Theory
Authors: Raju G. Hema T. , Vembu V. , Raju P. Ramamurty , Ganesan G. , Narendar S.
Published: October 2023

Composite nanobeams with carbon nanotube (CNT) reinforcement are crucial components in various applications due to their unique mechanical and thermal properties. The present work investigates the frequency–aspect ratio relationship in composite nanobeams with CNT reinforcement, particularly under varying temperatures, magnetic field strengths, and Winkler elastic stiffnesses. The non-dimensional frequency variation with aspect ratio, influenced by temperature differences, reveals distinct behavior patterns. The introduction of a magnetic field alters frequency characteristics, with uniform distribution (UD) nanobeams displaying higher frequencies. The impact of Winkler elastic stiffness, temperature differences, and magnetic field strengths on frequency elucidates differing responses between UD, [Formula: see text]-type distribution (XD), and [Formula: see text]-type distribution (VD) nanobeams. Nonlocal strain gradient theory proves essential in capturing dynamic characteristics influenced by CNT distribution. These findings shed light on the intricate dynamics of composite nanobeams, providing valuable insights for the design of future nano-devices employing CNT-reinforced composite beams as fundamental elements.
The Moving Element Method for the Dynamic Responses of Floating Double-Plate Structures on the Shallow Water
Authors: Luong Van Hai , Do Ngoc Thuan
Published: October 2023

In this paper, the dynamic behavior of floating double-plate structures under a moving load is investigated in great detail with different factors utilizing the moving element method (MEM). The structures in this study are very large floating structures (VLFSs). The Kirchhoff–Love theory is used to model two floating plates connected by a Winkler-type elastic core, whilst the water surrounding the structure is simulated by the shallow linear water wave theory. In order to improve the computational efficiency of moving load problems, the MEM is adopted. Since the MEM uses fewer discrete elements than those of the traditional finite element method (FEM), the computational cost is reduced. The proposed two-plate model helps to reduce the influence of the surrounding water on the upper plate. Several numerical results are presented to investigate the influence of the ratio of thickness between layers as well as core stiffness on the displacements with different water depths, and load speeds.
On compatible Leibniz algebras
Authors: Makhlouf Abdenacer , Saha Ripan
Published: October 2023

In this paper, we study compatible Leibniz algebras. We explore the classification of complex Leibniz algebras in dimensions 2 and 3 to provide compatible pairs. We characterize compatible Leibniz algebras in terms of Maurer–Cartan elements of a suitable differential graded Lie algebra. Moreover, we define a cohomology theory of compatible Leibniz algebras, which in particular controls one-parameter formal deformations of this algebraic structure. Motivated by a classical application of cohomology, we moreover study abelian extensions of compatible Leibniz algebras.
Compatible left-symmetric conformal algebras on the Schrödinger–Virasoro conformal algebra and its subalgebra
Authors: Luo Lipeng , Su Yucai , Wu Henan
Published: October 2023

In this paper, we study the compatible left-symmetric conformal algebraic structures on the Schrödinger–Virasoro conformal algebra [Formula: see text] and its subalgebra [Formula: see text]. The classifications of compatible left-symmetric conformal algebraic structures on the Lie conformal algebras [Formula: see text] and [Formula: see text], under some suitable conditions, are completely characterized.
Balanced pairs and recollements in extriangulated categories with negative first extensions
Authors: He Jian , Zhou Panyue
Published: October 2023

A notion of balanced pairs in an extriangulated category with a negative first extension is defined in this paper. We prove that there exists a bijective correspondence between balanced pairs and proper classes [Formula: see text] with enough [Formula: see text]-projectives and enough [Formula: see text]-injectives. This can be regarded as a simultaneous generalization of corresponding results of Fu–Hu–Zhang–Zhu for triangulated categories and of Wand–Li-Huang for abelian categories. Besides, we show that if [Formula: see text] is a recollement of extriangulated categories, then balanced pairs in [Formula: see text] can induce balanced pairs in [Formula: see text] and [Formula: see text] under natural assumptions. As an application, this result generalizes a result by Fu–Hu–Yao in abelian categories. Moreover, it highlights a new phenomena when it is applied to triangulated categories.
Sparse series solutions of random boundary and initial value problems
Authors: Yang Fang , Chen Min , Li Pengtao , Qu Wei , Chen Jiecheng , Qian Tao
Published: October 2023

The study investigates the utilization of sparse representations through dictionary elements to address the classical Dirichlet and Cauchy types of stochastic boundary value problems (BVPs) and initial value problems (IVPs). A novel approach is introduced based on the recently developed stochastic pre-orthogonal adaptive Fourier decomposition (SPOAFD) technique. By employing SPOAFD, both analytic and numerical solutions for the stochastic BVPs and IVPs are formulated. Furthermore, the scope of the study is extended to include BVPs and IVPs associated with a specific class of fractional heat equations and fractional Poisson equations. In addition to establishing the theoretical framework, important computational aspects are thoroughly discussed to enable the implementation of practical algorithms. The proposed methodology is validated through numerical examples, demonstrating its effectiveness and computational efficiency.
A novel occluded face detection approach using Enhanced ORB and optimized GAN
Authors: Nelson Abhilash , Shaji R. S.
Published: October 2023

Objectives:This research presents an approach to detect occluded face images. In order to achieve this, the research presents a novel technique that involves feature extraction and occluded face recognition.

Methods: Feature extraction is performed by the enhanced ORB algorithm, which is proposed by the modification of the Oriented Fast and Rotated Brief (ORB) algorithm, by adding a phase for contrast adjustment, together with CNN features. For occluded face recognition, a Generative Adversarial Network (GAN) optimized by the proposed SR-SSA is designed. SR-SSA is proposed by the integration of Search and Rescue Optimization (SAR) in the Sparrow Search Algorithm (SSA).

Results: The experimental results demonstrate that the SR-SSA-based GAN algorithm outperforms existing methods in terms of accuracy of 0.956, FAR of 0.045 and FRR of 0.021.
Piecewise scalable frames in Hilbert spaces
Authors: Khosravi Amir , Farmani Mohammad Reza
Published: October 2023

Tight frames are extremely useful in applications. A scalable frame was recently introduced as a frame with the property of generating a tight frame by rescaling its frame vectors. In this paper, we consider piecewise scalable frames. We obtain some characterizations for them, and demonstrate that scalability is stable under unitary operators and isomorphisms between two Hilbert spaces. We further obtain a relation between the piecewise scalable frames in Hilbert spaces, and their tensor product
Community detection: Concepts, algorithms, evaluation and challenges
Authors: Qu Song , Yuan Guan , Xu Hui , Zhang Yanmei , Tang Mingqing , Zhu Mu
Published: October 2023

Recently, research on complex networks has become a hot topic. Community detection, as a main task in social network analysis, plays an important role in complex networks. In this paper, we survey and summarize the development and trend of community detection and analyze typical algorithms presented in recent years. We first discuss the algorithms from algorithmic thinking, key technology and the advantages and disadvantages. Second, evaluation metrics and datasets are introduced. Finally, some application scenarios are pointed out for the potential application in the future. It is hoped that this review will serve as the steppingstone for those interested in community detection.
CBDT-Oglyc: Prediction of O-glycosylation sites using ChiMIC-based balanced decision table and feature selection
Authors: Zeng Ying , Yuan Zheming , Chen Yuan , Hu Ying
Published: October 2023

O-glycosylation (Oglyc) plays an important role in various biological processes. The key to understanding the mechanisms of Oglyc is identifying the corresponding glycosylation sites. Two critical steps, feature selection and classifier design, greatly affect the accuracy of computational methods for predicting Oglyc sites. Based on an efficient feature selection algorithm and a classifier capable of handling imbalanced datasets, a new computational method, ChiMIC-based balanced decision table O-glycosylation (CBDT-Oglyc), is proposed. ChiMIC-based balanced decision table for O-glycosylation (CBDT-Oglyc), is proposed to predict Oglyc sites in proteins. Sequence characterization is performed by combining amino acid composition (AAC), undirected composition of [Formula: see text]-spaced amino acid pairs (undirected-CKSAAP) and pseudo-position-specific scoring matrix (PsePSSM). Chi-MIC-share algorithm is used for feature selection, which simplifies the model and improves predictive accuracy. For imbalanced classification, a backtracking method based on local chi-square test is designed, and then cost-sensitive learning is incorporated to construct a novel classifier named ChiMIC-based balanced decision table (CBDT). Based on a 1:49 (positives:negatives) training set, the CBDT classifier achieves significantly better prediction performance than traditional classifiers. Moreover, the independent test results on separate human and mouse glycoproteins show that CBDT-Oglyc outperforms previous methods in global accuracy. CBDT-Oglyc shows great promise in predicting Oglyc sites and is expected to facilitate further experimental studies on protein glycosylation.
Types of Innovation and Sustainable Development: Evidence from Medium- and Large-Sized Firms
Authors: Agoraki Konstantina K. , Deirmentzoglou Georgios A. , Psychalis Marios , Apostolopoulos Sotiris
Published: October 2023

In the last few decades, the connection between innovation and sustainable development has been brought to the surface due to the concerns of academics, scientists, and policymakers regarding environmental and social issues. Although numerous studies have discussed the significance of innovation in achieving corporate sustainable development (CSD), the relationship between these two concepts remains vague. Under this background, the aim of this study was to examine which types of innovation have a significant impact on CSD. In particular, four types of innovation were tested — incremental, radical, product, and process innovation — with the three dimensions of CSD: the social, environmental, and economic dimensions. The data collected from medium- and large-sized firms revealed that incremental, radical, and process innovation had a significant positive impact on CSD. These results have substantial theoretical and managerial implications, as they indicate what types of innovation managers should focus on in order to improve their sustainable business performance.
Anisotropic strange quintessence stars in modified f(R,ϕ) theory of gravity
Authors: Malik Adnan , Naz Tayyaba , Tariq Ayesha , Yousaf Z. , Alkhaldi Ali H. , Umair Shahzad M.
Published: October 2023

This paper investigated the anisotropic quintessence stars in the [Formula: see text] theory of gravity, where [Formula: see text] is the Ricci scalar and [Formula: see text] is the scalar potential. We investigated the field equations of the [Formula: see text] theory of gravity by using the Krori–Barua technique. We have determined that all the obtained solutions are free from central singularity and potentially stable. The observed values of mass and radius of the different strange stars Her X1, SAXJ1808.4-3658, and 4U1820-30 have been used to calculate the values of unknown constants in the Krori and Barua metric. The physical phenomena of stars, such as energy density, pressure components, anisotropy, sound speeds, equation of state parameters, energy conditions and redshift have been investigated in detail.
Monotone metric tensors in quantum information geometry
Authors: Ciaglia F. M. , Di Cosmo F. , Di Nocera F. , Vitale P.
Published: October 2023

In this paper, we review some geometrical aspects pertaining to the world of monotone quantum metrics in finite dimensions. Particular emphasis is given to an unfolded perspective for quantum states that is built out of the spectral theorem and is naturally suited to investigate the comparison with the classical case of probability distributions.
Berry phase models and the electromagnetic trajectories of an optical fiber with a geodesic Frenet frame
Authors: Güler Fatma
Published: October 2023

In this study, we take the striction line which only exists on a ruled surface as an optical fiber. We examine Berry phase model of an optical fiber with a geodesic Frenet frame. We find the direction of the polarized light concerning the plane in which the electric field [Formula: see text] is located. Also, the electromagnetic trajectories of optical fiber are obtained. Finally, we give the electromagnetic flux ruled surfaces formed by the Killing vector fields of the EM-trajectories of the optical fiber and numerical examples.
Bäcklund transformations of multi-component Boussinesq and Degasperis–Procesi equations
Authors: Zhang Lixiang , Li Chuanzhong , Wang Haifeng
Published: October 2023

The finding of new integrable coupling systems has become an important area of research in mathematical physics and their study will aid in the classification of multi-component integrable systems. A basic method for generating integrable coupling systems is algebraic expansion, for example, the Frobenius algebra, the Lie algebra, the superalgebra, and so on. In this paper, we introduce a Frobenius Boussinesq equation based on the Frobenius algebra, and then we present a Lax pair of it. It follows that we give a Bäcklund transformation of the Frobenius Boussinesq equation. Furthermore, the lattice equation of the Frobenius Boussinesq equation is presented by using three Bäcklund transformations, and then obtain the exact solutions. Additionally, we obtain the conservation laws of the Frobenius Boussinesq equation via the Bäcklund transformation. Strongly coupled and weakly coupled systems physically represent strong and weak interactions, respectively. In this paper, we introduce a weakly coupled Degasperis–Procesi (DP) equation, and construct a Lax pair of it. In addition, the Bäcklund transformation and superposition principle are applied to investigate the weakly coupled DP equation. We also obtain the conservation laws of the weakly coupled DP equation. Then, we introduce a strongly coupled DP equation, and use the same method to study the strongly coupled DP equation. The exact solutions of these two equations are obtained. Moreover, we introduce a [Formula: see text]-DP equation. Considering the superposition principle, we obtain the solution of an associated [Formula: see text]-DP equation by using Bäcklund transformations. These new multi-component integrable systems can enrich the existing integrable models and possibly describe new nonlinear phenomena.
Universe in f(R,G) gravity with special form of q
Authors: Tiwari R. K. , Shukla Bhupendra Kumar , Beesham A. , Agrawal Sudha
Published: October 2023

This paper explores the dynamic behavior of the universe within the framework of the [Formula: see text] theory of gravity. Here, [Formula: see text] and [Formula: see text] represent the Ricci scalar and Gauss–Bonnet invariant, respectively. By solving the modified field equations with the chosen [Formula: see text] function, specifically [Formula: see text], we determine the best fit values of model parameters that are consistent with recent observational datasets. These datasets include 57 data points from the Cosmic Chronometers, Pantheon, and BAO datasets. Furthermore, we analyze the physical properties of cosmographic parameters, such as energy density and pressure, corresponding to the constrained values of the model parameters. The evolution of the deceleration parameter in our study indicates a transition from a decelerated phase to an accelerated phase in the universe. Remarkably, our [Formula: see text] cosmological model effectively describes the late-time cosmic acceleration without requiring the introduction of a dark energy component in the field equations.
Energy conditions in f(R,A) gravity
Authors: Rani Shamaila , Ahmed Iftikhar , Anwar Umair , Azhar Nadeem , Jawad Abdul
Published: October 2023

In this paper, we consider the framework of the newly proposed modified theory of gravity named [Formula: see text] gravity, wherein [Formula: see text] and [Formula: see text] signify the Ricci and anticurvature scalars, respectively. For our cosmic discussions, we evaluate a renowned [Formula: see text] model, incorporating various forms of the scale factor within the context of Friedmann–Robertson–Walker (FRW) spacetime. Our exploration delves into energy conditions, the effective equation of state parameter and the stability of models within the [Formula: see text] theory. These models are further elucidated through graphical representations plotted against time and their respective model constants. Notably, it is observed that scale factors with exponential terms yield more consistent results in comparison to those of power-law forms, given specific values of model constants.
Bright Solitons, dark solitons and periodic wave solutions of Chen–Lee–Liu model
Authors: Arshed Saima , Sadaf Maasoomah , Akram Ghazala , Farooq Kainat
Published: October 2023

Chen–Lee–Liu (CLL) equation has many applications in optical fibers as well as in plasma physics. It describes the propagation of optical pulse in the monomode fiber. CLL equation is a modification of the nonlinear Schrödinger equation. In this paper, the nonlinear CLL is explored using generalized projective Riccati equation method and two variable [Formula: see text]-expansion method. Consequently, many new solitary wave solutions are achieved in a unique way. These solutions include dark solitons, bright solitons and periodic wave solutions which describe the related physical phenomena. In the end, these solutions are presented in the form of 3D and 2D plots in order to elaborate the wave structure corresponding to the obtained solutions.
Fractional-Order Rate-Dependent Piezoelectric Thermoelasticity Theory Based on New Fractional Derivatives and its Application in Structural Transient Response Analysis of Smart Piezoelectric Composite Laminates
Authors: Guo Huili , Shang Fulin , He Tianhu
Published: October 2023

Ultrafast heating technology (e.g., high-energy pulse-burst laser, laser-aided material processing, etc.) has been extensively used in micro-machining and manufacturing of piezoelectric devices (e.g., piezoelectric resonator, piezoelectric generators, etc.), and the related thermo-electromechanical coupling analysis becomes more significantly important. In recent years, although rate-dependent piezoelectric thermoelasticity theories were historically proposed, the memory-dependence feature of strain relaxation and heat conduction has not been considered yet. In this work, the unified forms of fractional order strain and heat conduction are developed by adopting fractional derivatives of the Caputo (C), Caputo–Fabrizio (CF), Atangana–Baleanu (AB), and Tempered–Caputo (TC) types. Following these models, a fractional-order rate-dependent piezoelectric thermoelasticity is established. With the aid of an extended thermodynamics framework, the new constitutive and governing equations are derived. The proposed theory is applied to investigate dynamic thermo-electromechanical responses of smart piezoelectric composite laminates with imperfect interfacial conditions by the Laplace transformation approach. The influences of different fractional derivatives, imperfect interfacial conditions, and materials constants ratios on wave propagations and structural thermo-electromechanical responses are evaluated and discussed in detail.
Congruence properties modulo powers of 2 for overpartitions and overpartition pairs
Authors: Tang Dazhao
Published: October 2023

In 2004, Corteel and Lovejoy introduced the notion of overpartitions in order to give a combinatorial proof of several celebrated [Formula: see text]-series identities. Let [Formula: see text] denote the number of overpartitions of [Formula: see text]. Many scholars have been investigated subsequently congruence properties modulo powers of [Formula: see text] satisfied by [Formula: see text]. Congruence properties modulo powers of 2 for [Formula: see text] were also considered by several scholars, where [Formula: see text] denotes the number of overpartition pairs of [Formula: see text]. In this paper, utilizing some [Formula: see text]-series identities and iterative computations, we prove several internal congruences and congruences modulo powers of 2 enjoyed by [Formula: see text] and [Formula: see text]. Moreover, we conjecture that these internal congruences and congruences are initial cases in the corresponding internal congruence families and congruence families. Finally, we pose a related conjecture and some questions that merit further investigation.
Log-concavity of infinite product and infinite sum generating functions
Authors: Heim Bernhard , Neuhauser Markus
Published: October 2023

In this paper, we expand on the remark by Andrews on the importance of infinite sums and products in combinatorics. Let [Formula: see text] be the double sequences [Formula: see text] or [Formula: see text]. We associate double sequences [Formula: see text] and [Formula: see text], defined as the coefficients of [Formula: see text] [Formula: see text] These coefficients are related to the number of partitions [Formula: see text], plane partitions [Formula: see text] of [Formula: see text], and Fibonacci numbers [Formula: see text]. Let [Formula: see text] and let [Formula: see text]. Then the coefficients are log-concave at [Formula: see text] for almost all [Formula: see text] in the exponential (involving [Formula: see text]) and geometric cases (involving [Formula: see text]). The coefficients are not log-concave for almost all [Formula: see text] in both cases, if [Formula: see text]. Let [Formula: see text]. Then the log-concave property flips for almost all [Formula: see text].