bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dissipative quantum Hopfield network: a numerical analysis
Authors: Torres Joaquín J , Manzano Daniel 
Published: July 2024

Abstract
We present extensive simulations of a quantum version of the Hopfield neural network to explore its emergent behavior. The system is a network of N qubits oscillating at a given Ω frequency and which are coupled via Lindblad jump operators built with local fields hi
depending on some given stored patterns. Our simulations show the emergence of pattern-antipattern oscillations of the overlaps with the stored patterns similar (for large Ω and small temperature) to those reported within a recent mean-field description of such a system, and which are originated deterministically by the quantum term including

s
x
i

qubit operators. However, in simulations we observe that such oscillations are stochastic due to the interplay between noise and the inherent metastability of the pattern attractors induced by quantum oscillations, and then are damped in finite systems when one averages over many quantum trajectories. In addition, we report the system behavior for large number of stored patterns at the lowest temperature we can reach in simulations (namely

T
=
0.005

T

C

). Our study reveals that for small-size systems the quantum term of the Hamiltonian has a negative effect on storage capacity, decreasing the overlap with the starting memory pattern for increased values of Ω and number of stored patterns. However, it also impedes the system to be trapped for long time in mixtures and spin-glass states. Interestingly, the system also presents a range of Ω values for which, although the initial pattern is destabilized due to quantum oscillations, other patterns can be retrieved and remain stable even for many stored patterns, implying a quantum-dependent nonlinear relationship between the recall process and the number of stored patterns.
Flow analysis of a two-layered micropolar fluid in a catheterized oesophageal tube under the influence of a dilating amplitude: Application to pre-diagnosis of oesophageal motility disorder
Authors: Pandey Sanjay Kumar , Pandey Anupam Kumar 
Published: July 2024

Abstract
This study employs the Homotopy perturbation method to analyze the behavior of immiscible, incompressible fluids within a cylindrical coaxial tube, focusing on scenarios relevant to physiological fluid dynamics, particularly in the catheterized oesophagus and similar biological systems. Adopting long-wavelength and low Reynolds number approximations, a two-layered model is proposed with a micropolar fluid in the core and a Newtonian fluid in periphery regions. Parameters such as velocity, flux, friction, pressure, and impedance variations are formulated, particularly under the influence of dilating wave amplitude. Generally, when a catheter is introduced, pressure rises. It is further found that while pressure falls with increasing micropolar parameter, it rises with coupling number upon catheter insertion. Thus feeding patients with micropolar fluids during catheter-assisted pre-diagnosis is impractical due to associated pressure rise. Observations suggest a complex pressure profile during bolus passage through the oesophagus due to the broadening of the catheter size. Additionally, impedance exponentially increases with catheter size, influenced by the micropolar parameters and the coupling numbers, with micropolar fluids exhibiting higher impedance than that with Newtonian fluids. However, this study underscores the significant impact of catheterization on physiological fluid dynamics, notably increasing oesophageal impedance by two to threefold. This highlights the critical role of catheters in altering flow characteristics, emphasizing the need for a careful medical intervention during pre-diagnostic assessments.
Recent advancements and progress in development in chalcogenide (S, Se)-based thin films for high-performance photodetectors: a review
Authors: Alanazi Hamdah T A , Alzaidy Ghadah Abdulrahman 
Published: July 2024

Abstract
Scientific and technical communities often debate photodetection as a significant technology due to its unquestionable and extensive usage in business and research. Traditional bulk semiconductors like GaN, Si, and InGaAs are being used less and less for photodetection in industry because they aren’t mechanically stable or flexible enough, they have expensive substrates, and charge carriers can’t move around freely enough. Nonetheless, 2D materials such as transition-metal nitrides, chalcogenides, and carbides, in addition to graphene, are leading the path toward achieving more sophisticated results and surpassing the limitations imposed by traditional semiconductors. This is due to their exceptional electronic and mechanical properties, which include flexibility, adjustable bandgaps, high mobilities, and ample potential for constructing heterojunctions of chalcogenides-based thin films. Given the recent surge in photodetection research, the field has expanded significantly and requires a systematic compilation of pertinent scientific knowledge. A comprehensive study must address many aspects of chalcogenides-based thin film manufacturing strategies, assembly procedures, device integration, spectral properties, heterojunction potential, and future research prospects. This paper specifically examines the use of chalcogenides-based thin film materials in photodetection. These areas include solar-blind, visible, near-infrared, and broadband detectors. We have expanded our discussion to include photodetector performance parameters and how the latest chalcogenides-based thin films formed by combining ordinary semiconductors have resulted in high-performance UV, visible, and IR range photodetection. These materials have the potential to be used as photodetectors. Ultimately, we provide a comparative demonstration of the performance characteristics of photodetectors, offering a distinct assessment of the suitability of these materials for use in the advancement of next-generation photodetectors.
Construction of high activity electrocatalyst for alkaline hydrogen evolution by doping magnetic Fe3O4 with RuO2
Authors: Kou Xinrui , Qi Yiyi , Pang Haiyan , Tian Heyun , Luo Jie , Zhang Ke , Liu Xiao , Xu Guangri , Liu Hongling 
Published: July 2024

Abstract
The rational build of hydrogen evolution reaction (HER) electrocatalyst with low-cost, highly efficient, and excellent stability is the key to realizing the electrochemical decomposition of water. Herein, the optimal ratio between RuO2 and Fe3O4 for high-activity electrocatalysts (RuO2/Fe3O4 hybrid nanoparticles) was obtained by the microemulsion method. The morphology and structure characterization show uniform distribution (average particle size of ∼35.0 ± 5.1 nm) and high crystallinity of the RuO2/Fe3O4 hybrid nanoparticles. Compared to RuO2/Fe3O4 (2:1) and RuO2/Fe3O4 (1:2) samples, electrochemical tests show that RuO2/Fe3O4 (1:1) exhibit favorable HER catalytic activity (overpotential: 181 mV at 10 mA cm−2; Tafel slope: 130 mV dec−1) and stability (no obvious activity attenuation during the 20 h) in an alkaline medium. The mechanism analysis implies that the doping of Fe3O4 accelerated the electron transfer rate and thus increased HER activity via the results of electrochemical impedance spectroscopy (EIS) tests. Blending the appropriate amount of Fe3O4 into RuO2 can not only reduce the cost of electrocatalyst but also improve the activity of electrocatalytic HER, which is expected to give guidance for the development of low-cost, highly stable nanostructured electrocatalysts for electrochemical HER in alkaline electrolytes.
Exchange bias behavior in cobalt ferrite-cobalt oxide CoFe2O4/CoO nanocomposites for data storage applications
Authors: Shahzad Khuram , Abbasi Muhammad Ali , Jabeen Ayesha , Zaman Muhammad , Shehzad Umar , Rafe Muhammad Hassan 
Published: July 2024

Abstract
In this study cobalt ferrite-cobalt oxide CFO/CoO nanoparticles were synthesized using hydrothermal chemical method for studying the exchange bias (EB) phenomena, a key parameter for data storage applications. The structural analysis was carried out by Scanning electron microscopy (SEM), x-ray diffraction (XRD) and Energy dispersive spectroscopy (EDS), which confirm formation of platelets like CFO/CoO nanoparticles with appropriate chemical composition of different elements with an average crystallite size of 15 nm. Magnetic study revealed the ferromagnetic behaviour of nanoparticles from (5 K–360 K) and blocking temperature has found to be above 360 K, which decreases nonmonotonically with increasing the applied field HFC. The field cool (FC) magnetic hystersis (MH) loop studies have revealed that the samples exhibit very large exchange bias effect. The values of exchange bias (HEB) is found to be maximum at low temperature and decreases with increasing temperature before vanishing at the blocking temperature. The aim of the study is to determine role of cooling field strength for the exchange bias in magnetically contrasted CFO/CoO nanoparticles suitable for data storage applications.
Effect of sliding speed and sliding distance on wear behavior of AZ31-B4C composite
Authors: Titarmare Vikram , Banerjee Sudip , Sahoo Prasanta 
Published: July 2024

Abstract
Emphasis of current research is to investigate the dry sliding behavior of AZ31 magnesium alloy and AZ31–1.5B4C magnesium metal matrix composites (MMCs) at varying sliding speeds and sliding distances. Magnesium alloy and composite are fabricated through ultrasonic assisted stir casting method. Optical microscope (OM), scanning electron microscopy (SEM), and energy dispersive x-ray analysis (EDAX) are used to characterize developed materials. Microhardness of all materials is measured using a Vickers microhardness tester. Wear-friction behavior is investigated in dry sliding mode using pin-on-disc tribometer at room temperature. Magnesium alloy and composite are tested over a range of sliding speeds (0.25–1.25 m s−1) and distances at a moderate normal load (20N). Wear morphology is finally investigated for composites and alloy under SEM and EDAX. SEM micrographs of as-cast AZ31-1.5B4C composite reveals uniform distribution of B4C particles with noticeable refinement in grain structure. EDAX spectra of AZ31-1.5B4C composite depict the presence of boron and carbon along with existing elements of AZ31 alloy. Microhardness has enhanced around 30% for Mg-MMC by incorporating 1.5 wt% B4C in AZ31 alloy. Furthermore, the use of B4C as reinforcement increases the density of the composite. Wear rate is reduced by around 20% and COF is reduced by around 25% for AZ31-1.5B4C composite compared to AZ31 alloy for all experimental conditions. Abrasion, oxidation, adhesion and delamination wear mechanisms are observed as dominant mechanism for varying sliding speeds and distances.
Influence of local defects in the generation of memory effect in Dy2Ti2O7 compound: Fe-doped study
Authors: Yadav Pramod K , Upadhyay Rajnikant , Kumar Rahul , Nukala Pavan , Upadhyay Chandan 
Published: July 2024

Abstract
The study of defect-induced effects in functional materials is high-priority research for the miniaturization of smart devices. To elucidate the influence of local defects stemming from intrinsic or extrinsic factors on the enigmatic behavior of cooperative spin dynamics, we investigated the Dy2-xFexTi2O7 compound within a narrow Fe substitution range (x = 0–0.15). Our experimental findings unequivocally demonstrate that the dynamic response of cooperative spins and the emergence of anomalous memory effect are intricately linked to local defects. Depending on the nature and dynamics of these defects, the dynamic response of cooperative spins undergoes alteration. Notably, observed anomalous effect becomes more pronounced in scenarios characterized by slower defect dynamics and when cooperative spins are further from equilibrium. The emergence and sensitivity of thermomagnetic hysteresis (memory effect) to cooperative spin dynamics and external stimuli underscore the richness of Dy2Ti2O7 as a material for captivating physics investigations.
An advance in the arithmetic of the Lie groups as an alternative to the forms of the Campbell-Baker-Hausdorff-Dynkin theorem
Authors: Kim Sunghyun , Liu Zhichen , Klemm Richard A 
Published: July 2024

Abstract
The exponential of an operator or matrix is widely used in quantum theory, but it sometimes can be a challenge to evaluate. For non-commutative operators X and Y, according to the Campbell-Baker-Hausdorff-Dynkin theorem, e
X+Y
is not equivalent to e
X
e
Y
, but is instead given by the well-known infinite series formula. For a Lie algebra of a basis of three operators {X, Y, Z}, such that [X, Y] = κ
Z for scalar κ and cyclic permutations, here it is proven that e
a
X+b
Y
is equivalent to e
p
Z
e
q
X
e−p
Z
for scalar p and q. Extensions for e
a
X+b
Y+c
Z
are also provided. This method is useful for the dynamics of atomic and molecular nuclear and electronic spins in constant and oscillatory transverse magnetic and electric fields.
Low energy electron scattering cross sections of cyanotriacetylene (HC7N) based on ab-initio R-matrix method
Authors: Vadhel Sagar , Vinodkumar P C , Vinodkumar Minaxi 
Published: July 2024

Abstract
Cyanotriacetylene (HC7N) is a linear unsaturated molecule detected in various regions of space. In this present study, we explored the quantum dynamics of low-energy electron collisions with linear cyanopolyyne molecule (HC7N) to identify the locations and structural features of their metastable negative ions (also known as transient negative ions). We employed the R-matrix method for handling low-energy electron scattering studies. To uncover trends among cyanopolyynes molecules, we have also incorporated results from Cyanoacetylene (HC3N) and Cyanodiacetylene (HC5N). Notably, we observed that the number of π* resonances increases and shifts to lower energies as the number of triple bonds increases in higher-order molecules. Our theoretical calculations contain elastic, differential, and momentum cross-sections in the elastic part. Additionally, we calculated excitation and ionization cross-sections in the inelastic regime. This comprehensive theoretical data on electron scattering will be valuable for understanding the molecular chemistry involving this interesting molecule.
Nonlocal advantage of quantum coherence under Garfinkle-Horowitz-Strominger dilation space-time
Authors: Ming Fei , Fang Bao-Long , Hu Xueyou , Yu Yang , Wang Dong 
Published: July 2024

Abstract
Nonlocal advantage of quantum coherence (NA-QC) is a relatively robust non-classical correlation and can be achieved by coherence complementary relations. In this work, we investigate NA-QC based on various coherence measures within the theoretical framework of a Garfinkle-Horowitz-Strominger dilation black hole. Interestingly, NA-QC exhibits monotonically decreasing evolutionary features with the growing dilation parameter in the physically accessible regions. Furthermore, the hierarchical relationship among NA-QC, quantum steerability and Bell-nonlocality is analyzed under the influence of Hawking radiation. It is shown that NA-QC is a subset of Bell-nonlocality and quantum steering is a superset of Bell-nonlocality. Additionally, to achieve more quantum resources, we propose a feasible physical scheme to control NA-QC by using optimal parity-time (

P
T

)-symmetric operations. The amount of NA-QC can be effectively enhanced in the certain time interval for the physical accessible state in the context of black hole. These results might play important roles for understanding quantum information theory under the curved space-time.
Examine the soliton solutions and characteristics analysis of the nonlinear evolution equations
Authors: Hossain A K M Kazi Sazzad , Akbar M Ali 
Published: July 2024

Abstract
The consistent and feasible enhanced

(

G

′

/
G
)

-expansion technique is applied to construct an assortment of fresh and universal soliton solutions to the two important nonlinear evolution equations. One of them is the Benjamin-Ono equation, which is a partial differential equation that describes the propagation of weakly nonlinear and weakly dispersive long waves in deep stratified fluids in one dimension. Another equation is the modified Benjamin-Bona-Mahony equation, which is a variant of the Benjamin-Bona-Mahony equation and is used to examine Rossby waves in rotating fluids as well as drift waves in plasma. In this study, we investigated the aforementioned equations and obtained sufficient soliton solutions, such as bell soliton, periodic and kink-shape soliton, singular and singular-kink soliton, and so on. All the solutions achieved have physical explanations, and plotting some 3D figures reveals the diverse physical configurations and characteristics. We also include a comparison of other’s solutions in the literature to our own, which validates our solutions. The solutions indicate that the mentioned method is adaptable, improved, and effective for other nonlinear evolution equations in mathematical physics.
Analysis of some newly constructed compact models in f(R, T) theory
Authors: Feng Yihu , Naseer Tayyab , Ashraf Asifa , Sofuoğlu Değer 
Published: July 2024

Abstract
In this paper, black hole solutions are developed within the framework of f(R, T) gravity through the minimal gravitational decoupling approach. By introducing a new source in the original isotropic matter distribution, the corresponding field equations acquire additional degrees of freedom. Applying the transformation on the radial metric function leads these equations to two distinct sets, each representing the influence of either the seed or additional source exclusively. In order to formulate the black hole solutions, the seed source is considered to be a vacuum, characterized by the Schwarzschild metric. To derive a viable solution for the second system, constraints are imposed on the metric potentials and energy-momentum tensor of the additional source. Three distinct solutions are graphically analyzed based on varying values of the decoupling parameter. The energy conditions are also plotted to determine the nature of the extra source. Finally, it is concluded that two of our three developed models agree with the asymptotic flatness criterion and energy bounds in this modified theory.
Enhancement of electrical and photo-electrical properties of P3HT:CrCl2 thin films for photo sensing applications
Authors: Mahdi Ali , Al-Saymari Furat A 
Published: July 2024

Abstract
In this work, doped and undoped P3HT thin films are prepared and deposited onto ITO interdigitated electrodes. To improve the optical and the electrical properties of the pure P3HT thin film, chromium(II) chloride was used as dopant material with three different weight percentage, 2.5%, 5%, 10%. Room-temperature current–voltage (I-V) characteristics of the samples were measured, showing an increase in the electrical current with increasing the dopant concentration. Under dark condition, the conductivity and resistivity of the pure P3HT thin films were enhanced by a factor of 5× as a result of doping the P3HT by 10 wt% of CrCl2. Under light intensity (50 mW cm−2) and at 10 V bias, the conductivity and resistivity obtained from P3HT:CrCl2 (10 wt%) thin films are 4.75 × 10−4 S cm−1 and ∼2 kΩ, respectively. These results exhibit an enhancement by a factor of ∼12× compared to those obtained from pure P3HT thin film. The current of the photo-sensors based on doped/undoped P3HT thin films are measured as a function of time under light intensity ranging from 0 to 50 mW cm−2 at 1 V bias, exhibiting high photo-response and good reproducibility. Three different wavelengths, white, green, and red were used as light sources to expose the photo-sensors. Under white light, photo-sensor based on P3HT:CrCl2(10 wt%) exhibit the highest values of the photo-responsivity and quantum efficiency, ∼23.3 mA W−1 and 5.8%, respectively, showing an enhancement by a factor of ∼ 11.5× compared to those obtained from the photo-sensor based on pure P3HT.
Generalization of Bernoulli polynomials to find optimal solution of fractional hematopoietic stem cells model
Authors: Avazzadeh Zakieh , Hassani Hossein , Ebadi Mohammad Javad , Bayati Eshkaftaki Ali , Katani Roghayeh , Rezvani Alireza 
Published: July 2024

Abstract
The study introduces a fractional mathematical model in the Caputo sense for hematopoietic stem cell-based therapy, utilizing generalized Bernoulli polynomials (GBPs) and operational matrices to solve a system of nonlinear equations. The significance of the study lies in the potential therapeutic applications of hematopoietic stem cells (HSCs), particularly in the context of HIV infection treatment, and the innovative use of GBPs and Lagrange multipliers in solving the fractional hematopoietic stem cells model (FHSCM). The aim of the study is to introduce an optimization algorithm for approximating the solution of the FHSCM using GBPs and Lagrange multipliers and to provide a comprehensive exploration of the mathematical techniques employed in this context. The research methodology involves formulating operational matrices for fractional derivatives of GBPs, conducting a convergence analysis of the proposed method, and demonstrating the accuracy of the method through numerical simulations. The major conclusion is the successful introduction of GBPs in the context of the FHSCM, featuring innovative control parameters and a novel optimization technique. The study also highlights the significance of the proposed method in providing accurate solutions for the FHSCM, thus contributing to the field of mathematical modeling in biological and medical research.
Optical soliton solution of the perturbed Biswas-Milovic equation having cubic-quintic-septic law nonlinearity in the presence of spatio-temporal and chromatic dispersion
Authors: Esen Handenur , Secer Aydin , Ozisik Muslum , Bayram Mustafa 
Published: July 2024

Abstract
In this manuscript, we investigate the analytical and soliton solutions of the cubic-quintic-septic law for the perturbed Biswas-Milovic equation, considering spatio-temporal and chromatic dispersions. The perturbed Biswas-Milovic equation with the spatio-temporal and chromatic dispersion terms provides a comprehensive study for describing nonlinear optical wave propagation in optical fiber. We use the wave transformation to reduce the main equation to a nonlinear ordinary differential equation. The transformation of the original equation into a more simplified form aims to attain a more profound comprehension of the fundamental dynamics of the system. We retrieve the analytical solutions of the presented model by implementing the new Kudryashov technique and a subversion of the new extended auxiliary equation approach. Besides, bright, singular, and V-shape soliton structures are represented. By employing powerful analytical techniques, we systematically derive a wide range of soliton solutions. This approach successfully captures diverse soliton types highlighting the novelty of applying the new Kudryashov technique and a subversion of the new extended auxiliary equation method to this complex model. Moreover, we analyze the soliton behavior influenced by various parameters. The analysis of the parameter influences reveals the complicated relationship governing the dynamics of the perturbed Biswas-Milovic model. Furthermore, this manuscript includes the modulation instability analysis for the presented model. Conducting modulation instability analysis for the presented equation enhances our understanding of the system’s stability and dynamics.