bluuebunny/crossref_metadata_2025 huggingface dataset:
Rapid resolution of hyperfibrinolysis in dogs with spontaneous hemoperitoneum following surgical control of hemorrhage
Authors: DeStefano Ian M. , Rozanski Elizabeth A. , Koethe Benjamin , de Laforcade Armelle M.
Published: April 2023

Objective

To estimate the point prevalence and duration of hyperfibrinolysis (HF) in dogs undergoing surgical control of spontaneous hemoperitoneum (SHP).

Design

Prospective observational study.

Setting

Single veterinary teaching hospital.

Animals

Forty‐five client‐owned dogs with SHP were screened for HF. Eighteen HF dogs treated surgically were studied.

Interventions

None.

Measurements and Main Results

Dogs with SHP and evidence of shock admitted for surgical control of hemorrhage were screened for HF. Blood samples were collected for PCV, total plasma protein, platelet count, and thromboelastography with 50 U/mL of tissue plasminogen activator at presentation and every 8 hours postoperatively until 72 hours, discharge, or death. HF was defined as a tissue plasminogen activator‐activated thromboelastography lysis percentage measured 30 minutes after maximum amplitude (LY30) of ≥20%. LY30 values were compared to a cohort of samples obtained from healthy dogs (n = 22). The point prevalence of HF in all dogs screened was 40% (18/45 dogs), and the mean LY30 at baseline for HF dogs was 48.9% (±24.2%), which was significantly higher than that of control dogs (4.8% ± 7.1%, P < 0.001) and non‐HF dogs (1.9% ± 5.7%, P < 0.001). In HF dogs, there was a significant decrease in LY30 between baseline and 8 hours (P < 0.0001) and between 8 and 16 hours (P = 0.035) but no significant change thereafter. LY30 at 8 hours (4%, range: 0%–23.4%) was not statistically different from control dogs (6.5%, range: 1.2%–32.8%, P = 0.664) suggesting early resolution of HF in this population. Only 2 of 18 dogs were persistently hyperfibrinolytic at 24 hours. Malignancy was diagnosed in 12 of 18 dogs (66.6%), while a benign etiology occurred in 6 of 18 dogs (33.3%). All HF dogs survived to discharge.

Conclusions

HF occurs in some dogs with hypovolemic shock due to hemoperitoneum but resolves rapidly following surgical control of bleeding without antifibrinolytic medications. Routine postoperative use of antifibrinolytics in dogs with hemoperitoneum in dogs undergoing surgical control of bleeding may not be warranted.
The phylogenetic position of Maritrema afanassjewi Belopol'skaya, 1952 (Digenea, Plagiorchiida: Microphallidae), a parasite of the Ussuri brown bear, Ursus arctos lasiotus Gray, 1867 (Carnivora, Ursidae)
Authors: Sokolov Sergey G. , Shchenkov Sergei V. , Khasanov Fuat K. , Gordeev Ilya I.
Published: April 2023

Adult digeneans of Maritrema afanassjewi Belopol'skaya, 1952 parasitize birds and mammals along the North Pacific coasts and were previously studied in terms of morphology. However, morphological features not supported by molecular characterization are considered an insufficient tool for the identification of evolutionary lineages of microphallid digeneans. Here we provide the first data on the phylogenetic position of this species inferred from sequences of the 28S rRNA gene and the ITS2 locus of the nuclear DNA, as well as additional morphometric data. The trematodes were isolated from the intestine of the Ussuri brown bear ( Ursus arctos lasiotus Gray, 1867) on Iturup Island (the southern Kuril Islands). This is the second record of M. afanassjewi in the brown bear. The phylogeny based on the 28S rRNA gene was poorly resolved for this parasite species. The analyses based on the ITS2 locus dataset showed that M. afanassjewi was a low-supported sister to Maritrema subdolum Jägerskiöld, 1909.
Transport properties in the Horndeski holographic two-currents model
Authors: Zhang Dan , Fu Guoyang , Wang Xi-Jing , Pan Qiyuan , Wu Jian-Pin
Published: April 2023

The transport features of the holographic two-currents model are investigated in the Horndeski gravity framework. This system displays metallic or insulating characteristics depending on whether the Horndeski coupling parameter $$\gamma $$
γ
is negative or positive, but is unaffected by other system parameters such as the strength of the momentum dissipation $$\hat{k}$$

k
^

, the doping $$\chi $$
χ
and the coupling between two gauge fields $$\theta $$
θ
. Secondly, we demonstrate that the thermal conductivities are affected not only by the inherent properties of the black hole, but also by the model parameters. Furthermore, we are particularly interested in the Lorentz ratios’ properties. As expected, the Wiedemann–Franz (WF) law is violated, as it is in the majority of holographic systems. Particularly intriguing is the fact that several Lorentz ratio bounds reported in the typical axions model still remain true in our current theories. We would like to highlight out, however, that the lower bound for $$\hat{\bar{L}}_A$$

L

¯

^

A

is affected by the system parameters $$\chi $$
χ
, $$\theta $$
θ
and $$\gamma $$
γ
, which differs from the case of the typical axions model.
Transformer-Based Approach Via Contrastive Learning for Zero-Shot Detection
Authors: Liu Wei , Chen Hui , Ma Yongqiang , Wang Jianji , Zheng Nanning
Published: April 2023

Zero-shot detection (ZSD) aims to locate and classify unseen objects in pictures or videos by semantic auxiliary information without additional training examples. Most of the existing ZSD methods are based on two-stage models, which achieve the detection of unseen classes by aligning object region proposals with semantic embeddings. However, these methods have several limitations, including poor region proposals for unseen classes, lack of consideration of semantic representations of unseen classes or their inter-class correlations, and domain bias towards seen classes, which can degrade overall performance. To address these issues, the Trans-ZSD framework is proposed, which is a transformer-based multi-scale contextual detection framework that explicitly exploits inter-class correlations between seen and unseen classes and optimizes feature distribution to learn discriminative features. Trans-ZSD is a single-stage approach that skips proposal generation and performs detection directly, allowing the encoding of long-term dependencies at multiple scales to learn contextual features while requiring fewer inductive biases. Trans-ZSD also introduces a foreground–background separation branch to alleviate the confusion of unseen classes and backgrounds, contrastive learning to learn inter-class uniqueness and reduce misclassification between similar classes, and explicit inter-class commonality learning to facilitate generalization between related classes. Trans-ZSD addresses the domain bias problem in end-to-end generalized zero-shot detection (GZSD) models by using balance loss to maximize response consistency between seen and unseen predictions, ensuring that the model does not bias towards seen classes. The Trans-ZSD framework is evaluated on the PASCAL VOC and MS COCO datasets, demonstrating significant improvements over existing ZSD models.
Quantization of symplectic fibrations and canonical metrics
Authors: Ioos Louis , Polterovich Leonid
Published: April 2023

We relate Berezin–Toeplitz quantization of higher rank vector bundles to quantum-classical hybrid systems and quantization in stages of symplectic fibrations. We apply this picture to the analysis and geometry of vector bundles, including the spectral gap of the Berezin transform and the convergence rate of Donaldson’s iterations toward balanced metrics on stable vector bundles. We also establish refined estimates in the scalar case to compute the rate of Donaldson’s iterations toward balanced metrics on Kähler manifolds with constant scalar curvature.
Sentiment Analysis of Social Network Comment Text Based on LSTM and Bert
Authors: Si Hongying , Wei Xianyong
Published: April 2023

This paper has the aim of solving problems in research studies on the analysis tasks of text emotion; the problems are the low utilization of text, the difficulty of effective information extraction, the failure of recognizing word polysemy with effectiveness. Thus, based on LSTM and Bert, the method of sentiment analysis on text is adopted. To be precise, word embedding of dataset in view of the skip-gram model is used for training course. In each sample, the word embeddings combine matric with the two-dimensional feature to be neural network input. Next, construction of analysis model for text sentiment combines Bert pre-training language model and long short-term memory (LSTM) network, using the word vector pre-trained by Bert instead of that trained in the traditional way to dynamically generate the semantic vector according to the word context. Finally, the semantic representation of words from text is improved by effectively identifying the polysemy of words, and the semantic vector is input into the LSTM to capture the semantic dependencies, thereby enhancing the ability to extract valid information. The Accuracy, Precision, Recall and F-Measure for the method of Bert–LSTM based on analysis of text sentiment are 0.89, 0.9, 0.84 and 0.87, indicating high value than the compared ones. Thus, the proposed method significantly outperforms the comparison methods in text sentiment analysis.
A Flooding-Based Droplet Routing Protocol for Digital Microfluidic Biochip
Authors: Swain Jyotiranjan , Pyne Sumanta
Published: April 2023

Droplet routing is a critical phase in the biochemical synthesis using digital microfluidic biochip. The goal is to transport droplets from one module to another, maintaining fluidic constraint at every instant. In this paper, we proposed a new flooding-based droplet routing protocol. It uses multiple copies of scout packets to flood the whole biochip and discover multiple routes. The explored routes are then validated by hello packets. Route length defines the priority order among droplets. The routes are mapped using a new heuristic number of shared cells. In the compaction phase, generate the parallel moving sequence for droplets. The simulation result shows 12.25% and 20.5% improvement in the latest arrival time for free and virtual topology, respectively.
Adaptive isogeometric methods with C1 (truncated) hierarchical splines on planar multi-patch domains
Authors: Bracco Cesare , Giannelli Carlotta , Kapl Mario , Vázquez Rafael
Published: April 2023

Isogeometric analysis is a powerful paradigm which exploits the high smoothness of splines for the numerical solution of high order partial differential equations. However, the tensor-product structure of standard multivariate B-spline models is not well suited for the representation of complex geometries, and to maintain high continuity on general domains special constructions on multi-patch geometries must be used. In this paper, we focus on adaptive isogeometric methods with hierarchical splines, and extend the construction of [Formula: see text] isogeometric spline spaces on multi-patch planar domains to the hierarchical setting. We replace the hypothesis of local linear independence for the basis of each level by a weaker assumption, which still ensures the linear independence of hierarchical splines. We also develop a refinement algorithm that guarantees that the assumption is fulfilled by [Formula: see text] splines on certain suitably graded hierarchical multi-patch mesh configurations, and prove that it has linear complexity. The performance of the adaptive method is tested by solving the Poisson and the biharmonic problems.
Cross-diffusion models in complex frameworks from microscopic to macroscopic
Authors: Burini D. , Chouhad N.
Published: April 2023

This paper deals with the micro–macro derivation of models from the underlying description provided by methods of the kinetic theory for active particles. We consider the so-called exotic models according to the definition proposed in [ N. Bellomo, N. Outada, J. Soler, Y. Tao and M. Winkler, Chemotaxis and cross diffusion models in complex environments: Modeling towards a multiscale vision, Math. Models Methods Appl. Sci. 32 (2022) 713–792]. The first part of the presentation focuses on a survey and a critical analysis of some phenomenological models known in the literature. We refer to a selection of case studies, in detail, the transport of virus models, social dynamics, and Keller–Segel in a fluid. The second part shows how a Hilbert-type approach can be developed to derive models at the macroscale from the underlying description provided by the kinetic theory of active particles. The third part deals with the derivation of macroscopic models corresponding to the selected case studies. Finally, a forward look into the future research perspectives is proposed.
An effective model for boundary vortices in thin-film micromagnetics
Authors: Ignat Radu , Kurzke Matthias
Published: April 2023

Ferromagnetic materials are governed by a variational principle which is nonlocal, nonconvex and multiscale. The main object is given by a unit-length three-dimensional vector field, the magnetization, that corresponds to the stable states of the micromagnetic energy. Our aim is to analyze a thin film regime that captures the asymptotic behavior of boundary vortices generated by the magnetization and their interaction energy. This study is based on the notion of “global Jacobian” detecting the topological defects that a priori could be located in the interior and at the boundary of the film. A major difficulty consists in estimating the nonlocal part of the micromagnetic energy in order to isolate the exact terms corresponding to the topological defects. We prove the concentration of the energy around boundary vortices via a [Formula: see text]-convergence expansion at the second order. The second-order term is the renormalized energy that represents the interaction between the boundary vortices and governs their optimal position. We compute the expression of the renormalized energy for which we prove the existence of minimizers having two boundary vortices of multiplicity [Formula: see text]. Compactness results are also shown for the magnetization and the corresponding global Jacobian.
Bilinear enhancements of quandle invariants
Authors: Gilroy Will , Nelson Sam
Published: April 2023

We enhance the quandle counting invariants of oriented classical and virtual links using a construction similar to quandle modules but inspired by symplectic quandle operations rather than Alexander quandle operations. Given a finite quandle [Formula: see text] and a vector space [Formula: see text] over a field, sets of bilinear forms on [Formula: see text] indexed by pairs of elements of [Formula: see text] satisfying certain conditions yield new enhanced multiset- and polynomial-valued invariants of oriented classical and virtual links. We provide examples to illustrate the computation of the invariants and to show that the enhancement is proper.
Finite temperature considerations in the structure of quadratic GUP-modified white dwarfs
Authors: Tuñacao James David M. , Abac Adrian G. , Otadoy Roland Emerito S.
Published: April 2023

In quantum gravity phenomenology, the effect of the generalized uncertainty principle (GUP) on white dwarf structure has been given much attention in recent literature. However, these studies assume a zero temperature equation of state (EoS), excluding young white dwarfs whose initial temperatures are substantially high. To that cause, this paper calculates the Chandrasekhar EoS and resulting mass-radius relations of finite temperature white dwarfs modified by the quadratic GUP, an approach that extends Heisenberg’s uncertainty principle by a quadratic term in momenta. The EoS was first approximated by treating the quadratic GUP parameter as perturbative, causing the EoS to exhibit expected thermal deviations at low pressures, and conflicting behaviors at high pressures, depending on the order of approximation. We then proceeded with a full numerical simulation of the modified EoS, and showed that in general, finite temperatures cause the EoS at low pressures to soften, while the quadratic GUP stiffens the EoS at high pressures. This modified EoS was then applied to the Tolman–Oppenheimer–Volkoff equations and its classical approximation to obtain the modified mass-radius relations for general relativistic and Newtonian white dwarfs. The relations for both cases were found to exhibit the expected thermal deviations at small masses, where low-mass white dwarfs are shifted to the high-mass regime at large radii, while high-mass white dwarfs acquire larger masses, beyond the Chandrasekhar limit. Additionally, we find that for sufficiently large values of the GUP parameter and temperature, we obtain mass-radius relations that are completely removed from the ideal case, as high-mass deviations due to GUP and low-mass deviations due to temperature are no longer mutually exclusive.
Unitary paradox of cosmological perturbations
Authors: Loc Ngo Phuc Duc
Published: April 2023

If we interpret the Bekenstein–Hawking entropy of the Hubble horizon as thermodynamic entropy, then the entanglement entropy of the superhorizon modes of curvature perturbation entangled with the subhorizon modes will exceed the Bekenstein–Hawking bound at some point; we call this the unitary paradox of cosmological perturbations by analogy with black hole. In order to avoid a fine-tuned problem, the paradox must occur during the inflationary era at the critical time [Formula: see text] (in Planck units), where [Formula: see text] is the first Hubble slow-roll parameter and [Formula: see text] is the Hubble rate during inflation. If we instead accept the fine-tuned problem, then the paradox will occur during the dark energy era at the critical time [Formula: see text], where [Formula: see text] is the Hubble rate dominated by dark energy, [Formula: see text] is the total number of e-folds of inflation and [Formula: see text] is a purification factor that takes the range [Formula: see text].
Event-by-event multiplicity fluctuations and correlations in ring-like and jet-like events in 197Au–AgBr collisions at 11.6 A GeV/c
Authors: Ali Bushra , Singh Sweta , Chandra Anuj , Ahmad Shakeel
Published: April 2023

Event-by-event (ebe) multiplicity fluctuations and correlations amongst the charged particles emitted in the forward–backward symmetric pseudorapidity ([Formula: see text]) windows of varying widths and positions are investigated by analyzing the experimental data on [Formula: see text]Au–AgBr collisions at 11.6[Formula: see text]A[Formula: see text]GeV/[Formula: see text]. The findings are compared with the predictions of relativistic transport model, urqmd and independent particle emission (or mixed event) model. It is observed that the fluctuations in ebe mean pseudorapidity values and those reflected from the fluctuations strength measure, [Formula: see text] are relatively higher as compared to those expected from the statistically independent particle emission model. The study of the variance, [Formula: see text] of a suitably defined forward–backward asymmetry variable [Formula: see text] as a function of [Formula: see text] window width and position indicates the presence of strong short-range correlations, which might arise due to isotropic decay of cluster-like objects either in forward or backward [Formula: see text] region. Furthermore, analyses of events having ring-like and jet-like substructures, carried out separately, suggest that the major contribution to the observed fluctuations in the data sample are due to ring-like events, while the contributions from the jet-like events appear to be rather small. The observed difference in the behavior of correlation strengths from the two types of events might be due to the enhanced emission of Cherenkov gluons, giving rise to the ring-like substructure. The mixed event analysis further confirms that the observed fluctuations are the distinct feature of the data, which disappear after event mixing.
Answer to a question by A. Mandarino, T. Linowski and K. Życzkowski
Authors: Popa Mihai
Published: April 2023

A recent work by Mandarino, Linowski and Życzkowski left open the following question. If [Formula: see text] is a certain permutation of entries of an [Formula: see text] matrix (“mixing map”) and [Formula: see text] is an [Formula: see text] Haar unitary random matrix, then is the family [Formula: see text] asymptotically free? (Here by [Formula: see text] we understand the matrix resulted by permuting the entries of [Formula: see text] according to the permutation [Formula: see text].) This paper presents some techniques for approaching such problems. In particular, one easy consequence of the main result is that the question above has an affirmative answer.
Quantum Wasserstein distance of order 1 between channels
Authors: Duvenhage Rocco , Mapaya Mathumo
Published: April 2023

We set up a general theory leading to a quantum Wasserstein distance of order 1 between channels in an operator algebraic framework. This gives a metric on the set of channels from one composite system to another, which is deeply connected to reductions of the channels. The additivity and stability properties of this metric are studied.
Metrics induced by certain Hilbert-Schmidt fidelities on positive semi-definite matrices
Authors: Toan Ho Minh , Khoi Vu The
Published: April 2023

Motivated by measuring the degree of similarity of a pair of quantum states (density matrices), we consider the metric property of the modified Bures angles and modified Bures distances of symmetric functions which are extensions of some fidelity measures on the spaces [Formula: see text] of nonzero positive semi-definite matrices. We use the positive semi-definiteness of the Gram-type matrices to characterize the metric property of the modified Bures angles. As a consequence, we can show that the modified Bures angles induced by the geometric mean, harmonic mean, minimum and maximum of two positive numbers are metrics on [Formula: see text]. In addition, we can also show that the metric property of the modified Bures angles is stronger than that of the modified Bures distances.
Effects of permutation functions on woven and non-woven frames
Authors: Ahmadi Ahmad , Askarizadeh Abbas
Published: April 2023

When a signal measured by woven frames is transmitted, the order of some of these coefficients may change, resulting in undesirable signal reconstruction. In this paper, we investigate the permutations that if two frames are woven, one of the frames will be woven with a permutation of the other frame. We also examine the existence of permutations that a Riesz basis and reordered Riesz basis are woven.
Strong uniqueness of finite-dimensional Dirichlet operators with singular drifts
Authors: Lee Haesung
Published: April 2023

We show [Formula: see text]-uniqueness for any [Formula: see text] and the essential self-adjointness of a Dirichlet operator [Formula: see text], [Formula: see text] with [Formula: see text] and [Formula: see text]. In particular, [Formula: see text] is allowed to be in [Formula: see text] or in [Formula: see text] for some [Formula: see text], while [Formula: see text] is required to be locally bounded below and above by strictly positive constants. The main tools in this paper are elliptic regularity results for divergence and non-divergence type operators and basic properties of Dirichlet forms and their resolvents.
Buckling and Post-Buckling of Bidirectional Porous Beam Under Bidirectional Hygrothermal Environment
Authors: Zhang Qiao , Sun Yuxin
Published: April 2023

In this paper, buckling and nonlinear post-buckling behaviors of a bidirectional porous (BDP) beam are investigated under bidirectional hygrothermal environment. Euler–Bernoulli beam theory with the von Kármán nonlinearity is employed to derive the nonlinear variable coefficient governing differential equations based on Rayleigh quotient method. Analytical solutions of critical buckling load and load–deflection equilibrium path in post-buckling are deduced for the single directional varying (SDV) porous beam. The general numerical solutions for bidirectional varying (BDV) porous beam are obtained by differential quadrature finite element method (DQFEM) with Newton–Raphson iteration method based on the variation principle. The high accuracy of the present numerical method with higher computing efficiency is verified by comparison with published reports and the analytical results in this work. Parametric analysis on effects of the porosity bidirectional distributions, porosity coefficients, distributions of hygrothermal environment and boundary conditions on buckling load and post-buckling response is carried out to enhance the buckling and deformation resistances in design, manufacture and usage of porous structures. The results show that the bidirectional porosity pattern, linear and nonlinear hygrothermal distribution and boundary conditions play a significant role on buckling critical external load and critical hygrothermal increments, buckling form and post-buckling path.
Impact of Double Time Delays on Regime Shift and Stochastic Resonance for a Species Population System Driven by Colored Correlated Multiplicative and Additive Noises
Authors: Wang Kang-Kang , Ye Hui , Wang Ya-Jun , Li Sheng-Hong
Published: April 2023

In this paper, the characteristics for the state transition between the boom state and the extinction one, varius stochastic resonance (SR) phenomena for a species population system induced by double time delays and colored cross-correlated Gaussian noises are investigated. The control of the species population system has an important effect on ecological balance and the development of human living environment. By means of the numerical calculation of the mean extinction time and the stationary probability density function (SPDF), we can figure out some fact: both external and internal noises, the noise correlation strength and its correlation time, one time delay can all reduce the ecological stability and shorten the survival time of the system; while the other time delay can enhance significantly the biological stability and postpone the extinction of the population. For the mean extinction time (MET) of the species population, it is found that noise correlation strength, time delay, the noise correlation time can all reduce the peak value of the MET, which leads to the reduction of the life cycle. Inversely, the other time delay will not change the maximum of the MET, and induce the peak value to shift to the left. With respect to the SNR, it is discovered that in the noise correlation strength and its correlation time, one-time delay mainly plays a prominent role in inhibiting the SR effect. On the contrary, the multiplicative noise can result in the enhancement of the resonant peak. In particular, the other time delay and the additive noise can stimulate the SR effect for the SNR during the initial period. However, the further increase of them will bring about the reduction of the resonant phenomenon.
Visualizing the Dickson–Siegel–Eichler–Roy elementary orthogonal group
Authors: Ambily A. A. , Rao R. A.
Published: April 2023

In this paper, we define a set of elementary orthogonal matrices similar to Vaserstein’s definition of elementary symplectic matrices. We prove that the elementary orthogonal group generated by these matrices is a conjugate of the Dickson–Siegel–Eichler–Roy (DSER) elementary orthogonal group defined on a free quadratic module with a hyperbolic summand.
MCSO: MANTA CROW SEARCH OPTIMIZATION-ENABLED ACTOR CRITIC NEURAL NETWORK FOR ALZHEIMER CLASSIFICATION USING 3D MRI IMAGES
Authors: NEETHU M. , JAYASINGH J. ROOPA
Published: April 2023

A form of dementia is Alzheimer’s syndrome, also known as a neurodegenerative syndrome, damages the neuron cells in a selective mode. The count of patients that is increased gradually here by the disease is considered a worldwide concern, which may cause death in more cases. The rapid and accurate detection and categorization of Alzheimer’s disease have obtained enormous awareness from researchers due to the studies of a deep model. However, the productive detection and categorization of Alzheimer’s disease with reliable biomarkers are more challenging tasks. In this paper, Manta crow search optimization (MCSO)-based Actor Critic Neural Network (ACNN) is devised for the Alzheimer classification process. The Region of Interest (ROI) is extracted based on the thresholding process, and the preprocessing is done using the Type 2 Fuzzy and Cuckoo Search (T2FCS) filter. Moreover, the Sparse Fuzzy C-means (Sparse FCM) model has been in employment to segment preprocessed images. The feature extraction is a productive process for classifying Alzheimer’s disease. The ACNN classifier is utilized for performing Alzheimer’s disease classification process. Furthermore, the ACNN classifier is skilled by a devised optimization algorithm named the MCSO model. The projected MCSO-based ACNN outperformed other existing techniques with a testing accuracy of 0.9295, sensitivity of 0.9378, and specificity of 0.9354.
EFFECTS OF MAGNETIC PARTICLES DIAMETER AND PARTICLE SPACING ON BIOMAGNETIC FLOW AND HEAT TRANSFER OVER A LINEAR/NONLINEAR STRETCHED CYLINDER IN THE PRESENCE OF MAGNETIC DIPOLE
Authors: FERDOWS M. , ALAM JAHANGIR , MURTAZA M. G. , TZIRTZILAKIS E. E.
Published: April 2023

Magnetic particles are essential in materials science, biomedical, bioengineering, heat exchangers due to their exceptional thermal conductivity and unique properties. This work aims to model and analyze the biomagnetic fluid flow and heat transfer, namely the flow of blood with magnetic particles (Fe3O[Formula: see text] induced by stretching cylinder with linear and nonlinear stretching velocities. Additionally, this study investigates the impact of particles diameter and their spacing under the influence of ferrohydrodynamics (FHD) principle. The collection of partial differential equations is transformed using similarity transformations to produce the theoretically stated ordinary differential system. An efficient numerical technique, which is further based on common finite difference method with central differencing, a tridiagonal matrix manipulation and an iterative procedure are used to solve the problem numerically. The major goal of this extensive study is to enhance heat transformation under the influence of numerous parameters. There have been numerous displays of the velocity profile, temperature distribution, local skin friction factor and rate of heat transfer in terms of the appearing physical parameters. It is observed that variation in velocity and temperature distributions is the cause of increasing the ferromagnetic interaction parameter and the size of magnetic particles. The enhancement of particle diameter causes an increment in the skin friction while the rate of heat transfer declines. For verifying purposes, a comparison is also shown with previously published scientific work and found to possess suitable accuracy.
A structural characterization of compactly supported OEP-based balanced dual multiframelets
Authors: Lu Ran
Published: April 2023

Compared to scalar framelets, multiframelets have certain advantages, such as relatively smaller supports on generators, high vanishing moments, etc. The balancing property of multiframelets is very desired, as it reflects how efficient vector-valued data can be processed under the corresponding discrete multiframelet transform. Most of the literature studying balanced multiframelets is from the point of view of the function setting, but very few approaches are from the aspect of multiframelet filter banks. In this paper, we study structural characterizations of balanced dual multiframelets from the point of view of the Oblique Extension Principle (OEP). The OEP naturally connects framelets with filter banks, which makes it a very handy tool for analyzing the properties of framelets. With the OEP, we shall characterize compactly supported balanced dual multiframelets through the concept of balanced moment correction filters, which is the key notion that will be introduced in our investigation. The results of this paper demonstrate what essential structures a balanced dual multiframelet has in the most general setting, and bring us a more complete picture to understand balanced multiframelets and their underlying discrete multiframelet transforms.
Sustainable Business Model Innovation Within a Complex Environment
Authors: Prihadyanti Dian
Published: April 2023

Sustainability is becoming an emerging issue since it attempts to fulfill current needs without sacrificing future generations. The role of the private sector is considered necessary in supporting sustainability, including the Sustainable Development Goals (SDGs). Implementation of a sustainable business model (SBM) has the potential to enable support for sustainability. Many business organizations have claimed to produce an SBM, but many have failed or are insufficient to provide sustainability benefits due to complexity. Therefore, available concepts regarding principles in SBM innovation need to be improved to have greater capacity in dealing with complexity. This paper explores principles for SBM innovation and the relationships between the elements based on empirical evidence through a longitudinal case study in a technology-based organization in Indonesia’s agriculture sector. The results show that seven principles, so-called “ecosystem-centric principles,” are a building block to successful SBM innovation. One principle determined the success of the other principles, and as a whole, work simultaneously and systemically in creating SBM innovation. The business model combines several basic SBMs and develops as an accelerator type of business model and, in a particular phase, combines the model with the crisispreneur. Compared to other SBM principles, the ‘ecosystem-centric principles’ is superior to dealing with a complex environment.
Linking Adaptive Governance, Strategic Flexibility and Responsible Innovation: Evidence from China
Authors: Cao Xia , Lv Dan , Xing Zeyu , Zhang Lanting
Published: April 2023

The transformative and complex nature of technological development raises some ethical issues regarding innovation. Actually, many emerging technologies which developed rapidly are actually a double-edged sword. While innovation promotes development, it also affects the nature and society adversely. We discuss the relations among adaptive governance, strategic flexibility and responsible innovation. According to the path of “guide-strategy-behavior”, the influence relationship model of “adaptive governance-strategic flexibility-responsible innovation” is constructed. We took 425 top managers, middle managers and R & D staff as respondents, and finished empirical study by structural equation model (SEM) and fs QCA. We have the following findings: (i) adaptive governance has a positive effect on responsible innovation; (ii) proactive flexibility plays a part in the mediating role between adaptive governance and responsible innovation; (iii) reactive flexibility plays a part in the mediating role between adaptive governance and responsible innovation; (iv) the mediating effect of proactive flexibility is stronger than reactive flexibility. These findings extend the research and practice of adaptive governance and responsible innovation.
Quintessence like behavior of symmetric teleparallel dark energy: Linear and nonlinear model
Authors: Hanin A. , Koussour M. , Sakhi Z. , Bennai M.
Published: April 2023

In Einstein’s General Relativity (GR), the gravitational interactions are described by the spacetime curvature. Recently, other alternative geometric formulations and representations of GR have emerged in which the gravitational interactions are described by the so-called torsion or non-metricity. Here, we consider the recently proposed modified symmetric teleparallel theory of gravity or [Formula: see text] gravity, where [Formula: see text] represents the non-metricity scalar. In this paper, motivated by several papers in the literature, we assume the power-law form of the function [Formula: see text] as [Formula: see text] (where [Formula: see text], [Formula: see text], and [Formula: see text] are free model parameters) that contains two models: Linear ([Formula: see text]) and nonlinear ([Formula: see text]). Further, to add constraints to the field equations we assume the deceleration parameter form as a divergence-free parametrization. Then, we discuss the behavior of various cosmographic and cosmological parameters such as the jerk, snap, lerk, [Formula: see text] diagnostic, cosmic energy density, isotropic pressure, and equation of state (EoS) parameter with a check of the violation of the strong energy condition (SEC) to obtain the acceleration phase of the Universe. Hence, we conclude that our cosmological [Formula: see text] models behave like quintessence dark energy (DE).
On the nonlocal third-order inhomogeneous Heisenberg spin system with self-consistent potential
Authors: Ge Jingjing , Li Chuanzhong
Published: April 2023

We first obtain the Lax pair of the third-order inhomogeneous Heisenberg system by equivalent transformation and obtain the third-order inhomogeneous Heisenberg system with self-consistent potential. Second, we discuss the nonlocal third-order inhomogeneous Heisenberg system with self-consistent potential and its nonlocal conditions. Further, the Darboux transformation of the nonlocal third-order inhomogeneous Heisenberg system with self-consistent potential is constructed. Using Darboux transformation, the explicit solutions of the nonlocal third-order inhomogeneous Heisenberg system with self-consistent potential are presented.
Wave Propagation through a Piezoelectric Semiconductor Infinite Space
Authors: Cao Tong , Li Li , Liu Yang , Liang Hongmei , Wan Lijuan
Published: April 2023

The propagation characteristics of anti-plane waves, i.e., the quasi-shear horizontal (QSH) waves and the carrier (CA) waves through a piezoelectric semiconductor (Piezo-SEMI) infinite space are discussed in this paper. First, the elastic, piezoelectric, dielectric, carrier mobility and diffusion constants in the considered propagation coordinate system are obtained by Bonde transformation from those in the crystal axis coordinate system. For anti-plane case, the secular equation with the mechanical, electric and the carrier concentration fields of the anti-plane waves through a Piezo-SEMI infinite space is derived. We obtain all possible wave modes, i.e., QSH waves and CA waves, that propagate in the Piezo-SEMI material by solving the secular equation. Then, the wave speeds and attenuation of QSH waves and CA waves are obtained. The steady-state carrier concentration and biasing electric field have significant effects on dispersion and attenuation of the QSH waves and the CA waves, and the sensitive areas to the wave velocity and attenuation are obtained.
Rayleigh Wave Attenuation by a Nonlinear Metasurface with Both Vertical and Horizontal Resonators
Authors: Lou Jia , Fan Hui , Fang Xiang , Du Jianke
Published: April 2023

It is well known that earthquakes are one of the most catastrophic geological disasters. In recent years, the use of metasurfaces to suppress the propagation of seismic surface waves to protect surface buildings has received extensive attention. However, most of the previous research works are on linear metasurfaces and the effect of vertical resonators. In this work, we propose a nonlinear metasurface, which consists of a linear elastic semi-infinite space with vertical nonlinear and horizontal linear resonators attached to its top surface. Our study shows that the interaction between the dynamics of the resonators and the waves of the semi-infinite space creates a hybrid Rayleigh wave propagating along the surface. First, the dispersion of the hybrid Rayleigh wave is derived analytically. Then, numerical calculations are conducted and the effect of the coupling of the vertical and horizontal resonators on the dispersion is discussed. Afterward, a finite-element simulation is performed to verify the analytical predictions. The results demonstrate that an ultra-wide bandgap for the hybrid Rayleigh wave can be achieved by the designed nonlinear metasurface. This work may help promote the application of metasurfaces in the field of earthquake protection.
Advanced Anode Materials Based on Iron Oxides for Lithium-Ion Batteries
Authors: Pan Yue , Tong Kun , Tian Ruyu , Sun Limei , Chen Yang
Published: April 2023

Three main iron oxides, FeO, Fe2O3, and Fe3O4, have attracted much attention as anode materials for lithium-ion batteries (LIBs) for their high theoretical capacity, low cost, large-scale reserves, and environmental benignity. However, the poor cycling life and rate capability limit their commercial application on a large scale. Glaring strategies have been adopted to improve the performance of lithium storage. In this review, the electrochemical performances of FeO, Fe2O3, and Fe3O4anode materials could be improved by the decrease in particle size, regulation and control of the nanomicrostructures, the improvement of electrical conductivity, and the design of composites. Their effects on the electrochemical performance of the anode materials are discussed in detail. Furthermore, the development prospect of iron oxide-basedanode material has been prospected.
Design and Numerical Simulation of Refractory Metal Oxides and Dichalcogenides Embedded Tin-Based Perovskite Solar Cells
Authors: Sharma Divya , Mehra Rajesh , Raj Balwinder
Published: April 2023

The photovoltaic cells have undergone a series of metamorphosis since the perovskite materials are being used as light absorber in it. Owing to its superior light absorbing ability, perovskite materials have offered a bit of hope for future photovoltaic application. However, the stability and toxicity of perovskite-based solar cells have always remained a major concern. In this context, electronic characteristics pertaining to compounds of refractory metals, i.e., molybdenum and tungsten; and non-toxic properties of tin halide-based perovskite material may be considered to vanquish the issues related to durability and toxicity. This paper comprehends SCAPS 1D simulation and study of tin-based perovskite solar cell structures consisting of oxides and dichalcogenides of refractory metals viz oxides of molybdenum (Mo[Formula: see text], tungsten di-selenide (WS[Formula: see text], molybdenum di-telluride (MoT[Formula: see text] and molybdenum di-sulfide (Mo[Formula: see text] as hole transport materials (HTMs). Post simulation, the optimized efficiencies were observed to be 31.95%, 30.89%, 31.92% and 31.86% for Mo[Formula: see text], WS[Formula: see text], MoT[Formula: see text] and Mo[Formula: see text], respectively. Among these, perovskite solar cell consisting Mo[Formula: see text] as hole transport layer (HTL) displayed conspicuous result exhibiting open circuit voltage ([Formula: see text] of 1.1093 V, short circuit current density ([Formula: see text] of 33.88 mA/[Formula: see text], fill factor (FF) of 85.01% and power conversion efficiency (PCE) of 31.95%. These parameters indicate that oxides and dichalcogenides of refractory metals viz oxides of molybdenum (Mo[Formula: see text], tungsten di-selenide (WS[Formula: see text] and molybdenum di-telluride (MoT[Formula: see text] can be optimistic materials for future generation solar cells.
Energy estimation of the post-treatment process for powder aerosol deposited solid electrolyte films
Authors: Nazarenus Tobias , Schneider Jürgen , Hennerici Lukas , Moos Ralf , Kita Jaroslaw
Published: April 2023

In this study, the post-annealing process of garnet-type electrolyte films produced by the powder aerosol deposition method was optimized by utilizing high-power LEDs. The post-annealing time was greatly reduced from hours to several seconds. The film conductivity at room temperature could be increased by three orders of magnitude from 5.0 ⋅ [Formula: see text] S [Formula: see text] to 5 ⋅ [Formula: see text] S [Formula: see text]. For the first time, the required energy for this almost complete conductivity restoration could be quantitatively estimated.
Distance energy change of complete split graph due to edge deletion
Authors: Banerjee Subarsha
Published: April 2023

The distance energy of a connected graph [Formula: see text] is the sum of absolute values of the eigenvalues of the distance matrix of [Formula: see text]. In this paper, we study how the distance energy of the complete split graph [Formula: see text] changes when an edge is deleted from it. The complete split graph [Formula: see text] consists of a clique on [Formula: see text] vertices and an independent set on [Formula: see text] vertices in which each vertex of the clique is adjacent to each vertex of the independent set. We prove that the distance energy of the complete split graph [Formula: see text] always increases when an edge is deleted from it.
On the cop number of Sierpinski-like graphs
Authors: Çakmak Nazlıcan , Akyar Emrah
Published: April 2023

In this study, the cops and robber game is transferred to the Sierpinski graph, Sierpinski-like graphs [Formula: see text] and [Formula: see text], Sierpinski gasket graph [Formula: see text], and generalized Sierpinski graphs [Formula: see text] where [Formula: see text] has an order four and [Formula: see text]. We show that the cop number of these graphs is [Formula: see text], excluding [Formula: see text]. We also give a strategy for the cops to win.
Some new 3-designs invariant under the groups Sz(8) and S6(2)
Authors: Rahimipour Ali Reza , Adeli Morteza
Published: April 2023

In this paper, we determine all simple block-transitive 3-designs on 65 points with block stabilizer of order greater than 2, admitting the 2-transitive action of the group [Formula: see text]. As a result, we find 23 3-designs on 65 points that have [Formula: see text] as an automorphism group. Also we construct four 3-([Formula: see text]) designs for [Formula: see text] and two 3-([Formula: see text]) designs for [Formula: see text]. All of these designs have [Formula: see text] as the full automorphism group. Some of these designs are flag and anti-flag-transitive.
Critical and Compensation Behaviors of a Ferrimagnetic Multilayer System
Authors: Qahoom Y. Al , Aharrouch R. , Kihel K. El , Madani M. , Hachem N. , Bouziani M. El
Published: April 2023

By the use of Monte Carlo simulation, we have investigated the phase diagrams and magnetic properties of a ferrimagnetic Ising multilayer system with mixed spins (1, [Formula: see text]). The ground-state phase diagrams are first constructed for [Formula: see text]. To examine the influences of certain physical parameters of the system, namely the exchange interactions, the number of layers and the crystal field, we have studied the thermal behavior of the system magnetizations and the corresponding phase diagrams. The results obtained in this work show the existence of second- and first-order phase transitions and compensation temperatures. Moreover, we have investigated the hysteresis behavior, where the multi-loop phenomena are observed.
Central limit theorem for linear spectral statistics of block-Wigner-type matrices
Authors: Wang Zhenggang , Yao Jianfeng
Published: April 2023

Motivated by the stochastic block model, we investigate a class of Wigner-type matrices with certain block structures and establish a CLT for the corresponding linear spectral statistics (LSS) via the large-deviation bounds from local law and the cumulant expansion formula. We apply the results to the stochastic block model. Specifically, a class of renormalized adjacency matrices will be block-Wigner-type matrices. Further, we show that for certain estimator of such renormalized adjacency matrices, which will be no longer Wigner-type but share long-range non-decaying weak correlations among the entries, the LSS of such estimators will still share the same limiting behavior as those of the block-Wigner-type matrices, thus enabling hypothesis testing about stochastic block model.