bluuebunny/crossref_metadata_2025_split huggingface dataset:
Water-based metamaterial absorber for temperature modulation
Authors: Yang Hongqin , Zhang Jing , Shen Zhaoyang 
Published: September 2024

Abstract
In this study, a transmissive all-dielectric metamaterial absorber comprising a photosensitive resin and water layers was proposed. The water layers comprised coin rings, crosses, and fan shapes. The as-obtained absorber achieved >90% absorption of electromagnetic waves within the frequency range of 18.4–41.7 GHz, and the absorption bandwidth covered the Ka-band. Because of the symmetric structure of the designed metamaterial, it was not influenced by polarization. The inherent dispersive properties of water result in a dielectric constant that varies significantly with temperature. This led to fluctuations in the absorption efficiency of the designed metamaterial to different degrees with changes in temperature. The analysis of electric and magnetic fields distributions revealed that the primary absorption physical mechanism of the designed metamaterial originated from magnetic resonances in the water layers. The proposed transmissive metamaterial absorber has potential applications in high-sensitivity thermal and temperature sensors.
Enhancing the security of image communication with a new hyper-chaotic system
Authors: Deshpande Amey S , Daftardar-Gejji Varsha 
Published: September 2024

Abstract
The rapid expansion of multimedia communication necessitates the development of advanced and resilient cryptographic systems. As computational power grows, traditional encryption methods become susceptible to brute-force attacks. Cybersecurity threats are in a constant state of flux, requiring the creation of innovative cryptographic systems to outpace these developments. Chaotic systems offer a very good promise in cryptography as they are sensitive to initial conditions and parameters. In this study, the authors propose a novel hypercryptographic system (referred as NHCS) for color images that integrates a new hyperchaotic system with the RSA algorithm. This approach combines the unpredictable behavior of the hyper-chaotic system with the robust encryption capabilities of the RSA algorithm. This combination provides an additional layer of security. The hyper-chaotic systems offer a broader range of parameter values leading to chaos. Moreover, due to their four-dimensional nature, they can be employed to encrypt four-color channels. The NHCS algorithm has a large key space (of size 2704), 1024-bit RSA encrypted for higher security. The key sensitivity of this algorithm is of the order 10−16. The effectiveness of NHCS is validated through numerous test images from the USC-SIPI database and is bolstered by statistical analysis. The two indicators NPCR (∽100% ) and UACI (>33%) ensure that the system is robust against differential attacks. We perform a correlation analysis of the images and observe that correlation coefficients between adjacent pixels of the encrypted images are close to zero. Further, the information entropy values of the encrypted images are close to the ideal value 8. PSNR, MSE, and other statistical measures are found near their respective ideal values. A comparison with the other methods shows that NHCS is very promising.
Numerical simulation study on discharge characteristics of the Dual hollow cathode plasma source using magnetic mirror field
Authors: Zhu Tingru , Fu Dongpo , Cai Shixian , Li Jie , Zhang Caijie , Li Yingjie , Wang Kai , Lan Haoyang , Wang Kedong , Xie Xicheng , Yan Xueqing , Zhu Kun 
Published: September 2024

Abstract
The Dual hollow cathode plasma source uses hollow cathode cylindrical sputtering and ionizing metal elements, which has a high material utilization rate and has potential application in the field of material modification. Its performance index requires the cooperation of electrode discharge parameters and the rational utilization of the inner surface of the hollow cathode. In this paper, a two-dimensional fluid model of a Dual hollow cathode structure is developed to simulate the basic distribution of the Dual hollow cathode discharge, which fills the central region of the Dual hollow cathode structure and the electrons oscillate on the axis. The effects of electrode parameters and hollow cathode radius on the discharge were investigated. The results show that the radial electron density of the hollow cathode increases with increasing heated cathode voltage, but as the hot cathode voltage continues to expand beyond 1200 V this trend becomes less obvious. The enhancement of the wall ion current by the heated cathode voltage is very pronounced, and the hollow cathode discharge is the result of the mutual enhancement of the heated cathode voltage and the hollow cathode voltage. Hollow cathode sputtering needs to reach a voltage threshold of 300 V, and the existence of an optimal radius (r = 4 mm−6 mm) to achieve a high plasma density and at the same time favor hollow cathode sputtering.
Stark broadening of Cu II spectral lines
Authors: Dimitrijević Milan S 
Published: September 2024

Abstract
Electron-impact (Stark) full widths at half intensity maximum for 22 spectral lines of singly charged copper ion (Cu II) have been calculated by employing the modified semiempirical method. The calculations have been performed for an electron density of 1017 cm−3 and for a temperature range from 5 000 K up to 80 000 K. The obtained results, have been used to demonstrate similarities and regularities of Stark widths of Cu II spectral lines within a multiplet, a supermultiplet and a transition array. The obtained results have also been compared with the results of experiments and other theoretical data.
Influence of enhanced Laves phase shape and distribution on atomic-scale frictional wear mechanisms in nickel-based single crystal alloys
Authors: Sun Yuhang , Liu Yanjie , Han Jianfeng , Zhu Zongxiao , Zheng Min , Song Bo , Chen Weihua 
Published: September 2024

Abstract
This study aims to simulate the influence of different shapes and distribution states of Laves phases on the friction-wear behavior of nickel-based alloys using molecular dynamics (MD). The investigation systematically examined the mechanical properties, friction coefficient, number of worn atoms, dislocations, temperature, and other micro-deformation behaviors of materials incorporating horizontally and vertically distributed short rod-shaped, spherical, and short strip-shaped Laves phases. The presence of the Laves phase significantly impedes temperature transfer, defect motion, and atomic displacement in the workpiece, resulting in reduced dislocation glide rate and shorter average dislocation lengths. High dislocation densities accumulate at the Laves/γ phase interface, enhancing surface wear resistance. The short rod-shaped Laves phase, due to its large surface area at the Laves/γ interface, impedes defect motion more effectively than spherical and short strip-shaped phases. dislocation tangle, higher friction force, fewer worn atoms, a higher friction coefficient, and improved wear resistance. However, vertically distributed short strip-shaped and short rod-shaped Laves phases exhibit less effective defect interaction, resulting in increased wear and significant deformation. The spherical Laves phase, with its geometric symmetry, shows consistent wear resistance regardless of distribution state. Short rod-shaped Laves phase provides the best reinforcement due to its effective defect motion impedance, while the spherical Laves phase offers stable performance across different distribution states, making it the most suitable shape for Laves phase reinforcement.
Comparative analysis of perturbed f(R) gravity and perturbed rastall gravity models in describing cosmic evolution from early to late universe relative to the ΛCDM model
Authors: Yarahmadi Muhammad , Salehi Amin , Mousavi Hadis 
Published: September 2024

Abstract
This study conducts a meticulous examination of the cosmological implications inherent in Rastall gravity and f(R) gravity models, assessing their efficacy across distinct cosmic epochs, from early universe structure formation to late-time acceleration. In the initial stages, both models exhibit commendable compatibility with observed features of structure formation, aligning with the established ΛCDM model. The derived Jeans’ wavenumbers for each model support their viability. However, as the cosmic timeline progresses into the late universe, a discernible disparity surfaces. Utilizing the Markov Chain Monte Carlo method, we reconstruct the deceleration parameter (q) and identify Deceleration—Acceleration redshift transition values. For f(R) gravity, our results align closely with previous studies, emphasizing its superior ability to elucidate the recent cosmic acceleration. In contrast, Rastall gravity exhibits distinct redshift transition values. Our rigorous analysis underscores the prowess of f(R) gravity in capturing the observed cosmic acceleration, positioning it as a compelling alternative to the conventional ΛCDM model. The discernible shifts observed in the peaks of the CMB power spectrum and evolution of deceleration parameter (q) for both f(R) gravity and Rastall gravity models in the Early and Late universe, in relation to the ΛCDM model, provide compelling evidence supporting the proposition that these alternative gravity models can account for the anisotropy of the Universe without invoking the need for dark energy.
Irreversibility analysis of radiative TiO2+Al2O3+Cu/H2O ternary nanofluid flow over a bidirectional stretching sheet with cattaneo-christov heat flux: nanotechnology applications
Authors: Venkateswarlu B , Chavan Santosh , Joo Sang Woo , Kim Sung Chul 
Published: September 2024

Abstract
Ternary nanofluids demonstrate better heat transfer characteristics in contrast to conventional liquids and typical hybrid nanofluids. These are applied in sophisticated cooling systems for electronics, heat exchangers, and automotive engines, along with renewable energy systems such as solar collectors, where efficient heat transfer plays a crucial role. The aim of this research is to investigate the movement of a Casson ternary nanofluid passing through a bidirectional exponential sheet by employing the innovative Cattaneo-Christov heat flux concept. The utilization of the energy equation considers thermal radiation, viscous dissipation, and heat source/sink effects, with the integration of chemical reaction effects into the concentration equation. An analysis of entropy generation is utilized to evaluate the thermodynamic irreversibility within the system. The conversion of transport equations involves a transformation from partial to ordinary differential equations, followed by a numerical solution utilizing the BVP4C solver embedded in the MATLAB package R2022b. The impacts of developed factors on thermal, concentration, and velocity behavior, as well as engineering quantities, are thoroughly explored graphically. The outcome reveals that the velocity gradients diminish as magnetic fields intensify, while it amplified by the Hall factor. The rise in temperature of ternary nanofluid correlates with elevated levels of radiation, and Brownian motion. Concentration intensifies with the rapid development of thermophoresis influences. Heightened values of the Reynolds and Brinkman numbers give rise to amplified entropy production but a decrease in the Bejan number. The ternary nanofluid displays a remarkable 8.92% increase in skin friction on the x-axis and y-axis, influenced by the potent Darcy-Forchheimer factor. The rates of mass and heat transfer in nanofluids undergo a decrease of 8.58% and 12.52%, respectively, due to the heightened influence of Brownian motion and Eckert number. The results could provide valuable insights into the performance of ternary nanofluids in various industrial environments under specific conditions.
The synthesis and application of MRI-fluorescence dual mode materials with absorption ability on quantitative analysis of malachite green
Authors: Xu Feng , Bai Wenfeng , Zhang Jianpo , Jin Li 
Published: September 2024

Abstract
The histidine/Mn3O4/CdTe quantum dots (HMQ) composites with good magnetic resonance/fluorescent imaging and absorbance performance have been prepared based on biomimetic mineralization method, on which the peptide served as a carrier to guide the formation of Mn3O4 and CdTe quantum dots. The fluorescence of HMQ could be quenched by malachite green (MG), whereas the magnetic resonance signal (T1-MRI) was enhanced. Also, there is a linear correlation between the concentrations of MG added and the decreasing fluorescence intensity of HMQ (F0/F), the detection range is 0.06851–1.096 nmol l−1, and the LOD is 0.02750 nmol l−1. The corresponding T1WI detection range is 13.7–95.9 nmol l−1, and the LOD is 7.617 nmol l−1. Furthermore, the fluorescence quenching spectra of the HMQ adopted by MG have been analyzed, of which the data fit well with the law of pseudo-second-order kinetics, indicating that the prepared HMQ has good absorption properties. Therefore, HMQ could be used as an MRI/fluorescent dual sensor for the detection of MG.
Numerical analysis on fuzzy fractional human liver model using a novel double parametric approach
Authors: Verma Lalchand , Meher Ramakanta , Nikan Omid , Avazzadeh Zakieh 
Published: September 2024

Abstract
This paper introduces a fractal-fractional order model of the human liver (FFOHLM) incorporating a new fractional derivative operator with a generalized exponential kernel, specifically addressing uncertainties. The study delves into verifying the uniqueness and existence of this fuzzy FOHLM using Schauder’s Banach fixed point theorem and the Arzela-Ascoli theorem. It also investigates the fuzzy FOHLM using fixed-point theory and the Picard-Lindelof approach. Moreover, the research analyzes the stability and equilibrium points of the proposed model. To conduct this analysis, the study employs an innovative approach based on a double parametric generalized Adams-Bashforth technique within Newton’s polynomial framework. The numerical results of the proposed fuzzy FOHLM are validated by comparing them with real-world clinical data and other published results, and it shows that the fractal-fractional technique can yield greater efficacy and stimulation compared to the fractional operator when applied to epidemic simulations. Finally, the results of fractional fractal orders are illustrated graphically in a fuzzy environment.
Cosmology with persistent homology: a Fisher forecast
Authors: Yip Jacky H.T. , Biagetti Matteo , Cole Alex , Viswanathan Karthik , Shiu Gary 
Published: September 2024

AbstractPersistent homology naturally addresses the multi-scale topological characteristics of the large-scale structure as a distribution of clusters, loops, and voids. We apply this tool to the dark matter halo catalogs from theQuijotesimulations, and build a summary statistic for comparison with the joint power spectrum and bispectrum statistic regarding their information content on cosmological parameters and primordial non-Gaussianity. Through a Fisher analysis, we find that constraints from persistent homology are tighter for 8 out of the 10 parameters by margins of 13–50%. The complementarity of the two statistics breaks parameter degeneracies, allowing for a further gain in constraining power when combined. We run a series of consistency checks to consolidate our results, and conclude that our findings motivate incorporating persistent homology into inference pipelines for cosmological survey data.
The impact of constrained interacting dark energy on the bound-zone velocity profile
Authors: Lee Jounghun , Baldi Marco 
Published: September 2024

Abstract
We numerically study the effects of constrained interacting dark energy (CIDER) on the bound-zone velocity profiles around massive dark matter halos.
Analyzing the CIDER simulations performed by ref. [1] for three different cases of dark sector coupling (β = 0.03, 0.05 and 0.08)
as well as for the standard ΛCDM cosmology (β = 0), we determine the mean peculiar velocity profiles in the bound zones around the friends-of-friends
halos with masses larger than M
cut = 3 × 1013 h-1
M
⊙ at three redshifts, z = 0, 0.5 and 1. It is found that the universal power-law formula
proposed by ref. [2] originally for the ΛCDM case still describes well the bound-zone velocity profiles, V(r), even in the CIDER models.
The slope of V(r), turns out to be significantly affected by the CIDER, progressively decreasing as β increases.
Meanwhile, the amplitude of V(r) exhibits little dependence on β, which is ascribed to the identical Hubble parameters shared by the ΛCDM and
CIDER models in the entire redshift range. Our results imply that the bound-zone velocity slope can break a degeneracy even between the ΛCDM and
CIDER models with β ≤ 0.03, which the standard cosmological diagnostics fail to distinguish. We devise a simple analytic formula for the bound-zone slope
as a function of β, and prove its validity at all of the three redshifts. It is concluded that the slope of the mean bound-zone peculiar velocity profile
should be in principle a powerful probe of dark sector interaction.
Observational features of reflection asymmetric black holes
Authors: Chen Che-Yu , Pu Hung-Yi 
Published: September 2024

Abstract
The Kerr spacetime is symmetric with respect to a well-defined equatorial plane. When testing the equatorial reflection symmetry of an isolated black hole, one is at the same time testing the Kerr hypothesis in General Relativity. In this work, we investigate the possible observational features when a Keplerian disk is surrounding a rotating black hole without reflection symmetry. When such symmetry is broken, generically, the photon trajectories around the black hole and the Keplerian orbits on the accretion disk are distorted vertically away from the equatorial plane by an amount that depends on their distance to the black hole. In the reflection asymmetric spacetime we are considering, these two kinds of orbits are distorted in opposite directions. Interestingly, while the size and shape of black hole shadows closely resemble those of Kerr black holes, distinct observational characteristics can emerge in the disk image and emission line profiles. When observing the disk edge-on, a pronounced concave shape may appear along its innermost edge on the incoming side. Furthermore, distinctive horn-like features might be observed on the spectral line profile at the blue-shifted side. These special features can serve as compelling indicators of the reflection asymmetry present in rotating black holes.
Accurate power spectrum estimation toward Nyquist limit
Authors: Wang Yipeng , Yu Yu 
Published: September 2024

Abstract
The power spectrum, as a statistic in Fourier space, is commonly numerically calculated using the fast Fourier transform method to efficiently reduce the computational costs.
To alleviate the systematic bias known as aliasing due to the insufficient sampling, the interlacing technique was proposed.
We derive the analytical form of the shot noise under the interlacing technique,
which enables the exact separation of the Poisson shot noise from the signal in this case.
Thanks to the accurate shot noise subtraction, we demonstrate an enhancement in the accuracy of power spectrum estimation.
For the three dark matter samples with number density ranging from 10-2 Mpc-3 h3 to 10-4 Mpc-3 h3 analyzed on a coarse mesh of size 3 h-1 Mpc with Cloud-in-Cell mass assignment scheme, the systematic bias is well under control up to the Nyquist frequency.
On the contrary, the bias induced by the estimator that ignore the aliasing on the shot noise typically exceeds the statistical uncertainty on the frequency beyond 0.85 times the Nyquist frequency.

The good performance of our estimation allows an abatement in the computational cost by using low resolution and low order mass assignment scheme in the analysis for huge surveys and mocks.
An analytical study of the magnetic properties of the quantum dot/ring system: Rashba, magnetic field, and electron-electron effects
Authors: Shirsefat M , Servatkhah M , Hosseini S 
Published: September 2024

Abstract
The magnetic behavior of a two-electron quantum dot/ring system is analytically studied with electron–electron (e–e) interaction taking into account the Rashba spin–orbit interaction (SOI) and magnetic field. The Jacobi transformation has been employed to separate the Hamiltonian of the system to the center of mass and relative terms. The Schrödinger equation is analytically solved, and energy spectra are obtained. Then, the magnetization and susceptibility are calculated. The magnetization decreases by raising the magnetic field without and with SOI, and also without e-e interaction. Also, the SOI slightly modifies the magnetization of the system without e–e interaction. The susceptibility displays a peak structure as the magnetic field changes from low values to high values. The susceptibility by considering e–e interaction and without the SOI is always negative and its value decreases by rising the magnetic field. The susceptibility displays a transition from diamagnetic to paramagnetic with e–e interaction and SOI.
First results of a newly built hard x-ray/soft gamma spectrometer imaging system: on the aspect of plasma disruptions
Authors: Li Erzhong , Ma C. , Hu Y. 
Published: September 2024

Abstract
A new hard x-ray and soft gamma-ray spectrometer imaging system (HXS) has been built for two-dimensional measurements of plasma emitted photons in the Experimental Advanced Superconducting Tokamak. The system uses a 2D cadmium zinc telluride detector and integrated electronics, and is as a whole shielded by a tungsten box with a pinhole and tangential to the toroidal field. Three classes of typical energy spectra have been summarized in different experimental scenarios during the past campaigns. After performing tomography calculations, the local emissivity contours have been obtained in different energy ranges, which clearly show asymmetry of the plasma crosssection. The spatial perturbation structure is similar to the magnetohydrodynamic modes with low mode numbers. In particular, the runaway island found by an infrared camera (Jaspers et al 1994 Phys. Rev. Lett.
72 4093) is also measured by the HXS. There exists a reversal population in the energy spectra of both slide-away and strong neutral beam injection shots. It is consistently observed that the count rate is increased in the low-energy range before the plasma disruptions. Calculations in phase space indicate that the accelerated momentum flux can be deflected back to the low-energy region by the large pitch-angle scattering. In the post-disruption phase, the plasma current is not replaced by runaway electrons due to tearing modes or transiently bursting instabilities. This paper constructs the basics for the proper use of HXS for hard x-ray and soft gamma-ray measurements in future investigations of plasma disruptions.
Summary of the theory and modeling contributions at the 29th IAEA Fusion Energy Conference (FEC 2023)
Authors: Poli Francesca M. 
Published: September 2024

Abstract
The contributions in magnetic confinement fusion theory presented at the 29th Fusion Energy Conference (FEC 2023) are summarized here. This summary aims at providing an overview of the advances in the field and new directions in integrated modeling, computational physics, control design and application of artificial intelligence to discharge design and optimization. Given the increasing interest in bringing fusion to the grid and the focus on design and discharge optimization by means of self-consistent simulations that integrate physics and engineering with a hierarchy of fidelity models, the layout of this summary highlights applications over fundamental theory.