bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spatially uncorrelated two port MIMO DRA using phase gradient PRS for dual directional pattern diversity
Authors: Yadav Abhay Krishna , Verma Sudhanshu , Das Gourab , Sharma Anand , Tiwari Arvind Kumar 
Published: February 2024

Abstract
This study presents a system utilizing a cylindrical shape ceramic along with a suspended frequency selective surface (FSS), designed for multiple input multiple output (MIMO) applications with dual ports. The proposed antenna system showcases dual pattern diversity properties introducing spatially uncorrelated pattern. Key features of the structured radiator include the arrangement of cylindrical ceramic and the incorporation of an FSS. The alumina ceramic is purposefully placed on the upper part of the dielectric with a joint ground plane. These ceramics are stimulated using circular aperture. To reduce the far-field correlation, FSS with similar phase gradients are placed at the top of DRA at a certain distance. This arrangement yields two distinct radiation patterns from the two ports, ensuring a diverse radiation pattern for the antenna. The proposed technique yields significant improvements, surpassing 10 dB in isolation and achieving a 70% improvement in correlation values. The measured results validate the applicability of this antenna structure for WLAN access point applications within the 5.15–5.35 GHz frequency range.
Electro-microgellation of CS/PL spheres in situ self-embedded with AgNPs as a losartan delivery system
Authors: Zidan Mostafa M , Reicha Fikry Mohamed , Mansour-Gabr Mohamed M , Elmezayyen Ayman S 
Published: February 2024

AbstractIn situelectrosynthesis of new hybrid colloidal microgel particles of chitosan (CS)-pullulan (PL) self-embedded with AgNPs and introduced as a drug carrier for losartan (LOS) as a drug model. The impact of using Platinum (Pt) and Silver (Ag) sheets as anode and the electrosynthesis time on the formation mechanism, morphology, compositional and structural properties have been examined. The prepared samples characterized using uv–visible spectroscopy (UV–vis), transmission electron microscope (TEM), zeta potential, Fourier transform infrared spectroscopy (FTIR), Inductively coupled plasma optical emission spectroscopy (ICP-OES), x-ray diffraction analysis (XRD), and stability test. In addition to the Assessment of the antibacterial activity of the prepared samples. Also, incorporation of LOSin situduring the preparation of the microgel was investigated. The results demonstrated that uniform AgNPs with an average size 5.4 nm successfullyin situself-embedded within CS/PL microgel particles of a dual size distribution 151.4 and 43.5 nm with surface charge +25 mV. Besides, the incorporation of AgNPs during the electrosynthesis process played a crucial role in the morphology transition from pearl-necklace to microsphere. additionally, stability examination of the microgel particles introduced a valuable result that the single sphere containing Ag+ions underwent a slow reduction rate in consistency with nucleation favored overgrowth. Incorporation of AgNPs within CS/PL microgel has considerably enhanced the antimicrobial potential of the realized CS/PL against both gram-positive and gram-negative bacteria Investigation of the ability of the losartan incorporation explored a stable core/shell like structure with average size 95 nm and zeta potential + 39 mV promoting the spheres stability.
Utilizing a third order difference scheme in numerical method of lines for solving the heat equation
Authors: Yaseen Muhammad , Batool Sania 
Published: February 2024

Abstract
Obtaining the numerical solution for partial differential equations (PDEs) is a fundamental task in computational mathematics and scientific computing. In this work, we propose a third order numerical method of lines (MOL) based on difference schemes for the efficient and accurate approximation of heat equation. The method combines the flexibility of MOL with the superior accuracy of higher order difference schemes. The proposed approach begins by discretizing the spatial domain, and then applies higher order difference schemes to approximate the spatial derivatives in the PDE. The MOL framework is utilized to transform the resultant set of ordinary differential equations to a system of algebraic equations, facilitating their solution through an appropriate numerical method of choice. We have utilized the Adams method for this purpose. We analyze the stability of the proposed method and establish conditions under which it yields accurate and reliable solutions. We present the theoretical foundations of the method and discuss its implementation. We also present numerical results that demonstrate the procedure’s precision and effectiveness. The results show that the method is able to achieve high accuracy with relatively few grid points, and the results are compared with those obtained by some existing numerical schemes accessible in the literature.
Simulating quantum backflow on a quantum computer
Authors: Goussev Arseni , Joo Jaewoo 
Published: February 2024

Abstract
Quantum backflow is a counterintuitive effect in which the probability density of a free particle moves in the direction opposite to the particle’s momentum. If the particle is electrically charged, then the effect can be viewed as the contrast between the direction of electric current and that of the momentum. To date, there has been no direct experimental observation of quantum backflow. However, the effect has been simulated numerically (using classical computers) and optically (using classical light). In this study, we present the first simulation of quantum backflow using a real quantum computer.
Spectators no more! How even unimportant fields can ruin your Primordial Black Hole model
Authors: Wilkins A. , Cable A. 
Published: February 2024

Abstract
In this work we terminate inflation during a phase of Constant Roll by means of a waterfall field coupled to the inflaton and a spectator field. The presence of a spectator field means that inflation does not end at a single point, ϕ
e, but instead has some uncertainty resulting in a stochastic end of inflation. We find that even modestly coupled spectator fields can drastically increase the abundance of Primordial Black Holes (PBHs) formed by many orders of magnitude. The power spectrum created by the inflaton can be as little as 10-4 during a phase of Ultra Slow-Roll and still form a cosmologically relevant number of PBHs. We conclude that the presence of spectator fields, which very generically will alter the end of inflation, is an effect that cannot be ignored in realistic models of PBH formation.
Spectrum of gravitational waves from long-lasting primordial sources
Authors: Ramazanov Sabir 
Published: February 2024

Abstract
We discuss long-lasting gravitational wave sources arising and operating during
radiation-dominated stage. Under a set of assumptions, we establish the correspondence between
cosmological evolution of a source and the resulting gravitational wave spectrum. Namely, for the
source energy density ρs
falling as a power law characterized by the exponent β, i.e., ρs
∝ 1/aβ
, where a is the Universe scale factor, the spectrum takes the form Ωgw ∝ f
2β-8 in certain ranges of values of constant β and frequencies f. In particular, matching to the best fit power law shape of stochastic gravitational wave
background discovered recently by Pulsar Timing Array collaborations, one identifies β ≈ 5. We demonstrate the correspondence with concrete examples of long-lasting sources:
domain walls and cosmic strings.
OSIRIS-REx constraints on local dark matter and cosmic neutrino profiles
Authors: Tsai Yu-Dai , Eby Joshua , Arakawa Jason , Farnocchia Davide , Safronova Marianna S. 
Published: February 2024

Abstract
We derive purely gravitational constraints on dark matter and cosmic neutrino profiles in
the solar system using asteroid (101955) Bennu. We focus on Bennu because of its extensive
tracking data and high-fidelity trajectory modeling resulting from the OSIRIS-REx mission. We find
that the local density of dark matter is bound by ρ
DM ≲ 3.3 × 10-15 kg/m3 ≃ 6 × 106 ρ̅DM, in the vicinity of ∼ 1.1 au (where ρ̅DM ≃ 0.3 GeV/cm3). We show that high-precision tracking data of solar
system objects can constrain cosmic neutrino overdensities relative to the Standard Model
prediction n̅ν, at the level of η ≡ n
ν/n̅ν ≲ 1.7 × 1011(0.1 eV/mν
) (Saturn), comparable to the existing bounds from KATRIN and other
previous laboratory experiments (with mν
the neutrino mass). These local bounds have
interesting implications for existing and future direct-detection experiments. Our constraints
apply to all dark matter candidates but are particularly meaningful for scenarios including solar
halos, stellar basins, and axion miniclusters, which predict overdensities in the solar
system. Furthermore, introducing a DM-SM long-range fifth force with a strength α̃D
times stronger than gravity, Bennu can set a constraint on ρ
DM ≲ ρ̅DM(6 × 106/α̃D). These constraints can be improved in the future
as the accuracy of tracking data improves, observational arcs increase, and more missions
visit asteroids.
A new analytical model of magnetofluids surrounding rotating black holes
Authors: Hou Yehui , Zhang Zhenyu , Guo Minyong , Chen Bin 
Published: February 2024

AbstractIn this study, we develop a simplified magnetofluid model in the framework of GRMHD. We consider an ideal, adiabatic fluid composed of two components, ions and electrons, having a constant ratio between their temperatures. The flows are assumed to be governed by gravity, enabling us to employ the ballistic approximation, treating the streamlines as timelike geodesics. We show that the model is analytically solvable around a rotating black hole if the angular velocity of the geodesicuθis vanishing. In the corresponding solution, which is named the conical solution, we derive a comprehensive set of explicit expressions for the thermodynamics and the associated magnetic field. Furthermore, we explore the potential applications of our model to describe the thick disks and the jets at the horizon scale. Our model provides a direct pathway for the study of black hole imaging.
Improving constraints on primordial non-Gaussianity using neural network based reconstruction
Authors: Flöss Thomas , Daniel Meerburg P. 
Published: February 2024

Abstract
We study the use of U-Nets in reconstructing the linear dark matter density field and its
consequences for constraining cosmological parameters, in particular primordial
non-Gaussianity. Our network is able to reconstruct the initial conditions of redshift z = 0
density fields from N-body simulations with 90% accuracy out to k ≤ 0.4 h/Mpc, competitive
with state-of-the-art reconstruction algorithms at a fraction of the computational cost. We study
the information content of the reconstructed z = 0 density field with a Fisher analysis using the QUIJOTE simulation suite, including non-Gaussian initial conditions. Combining the pre-
and post-reconstructed power spectrum and bispectrum data up to k
max = 0.52 h/Mpc, we
find significant improvements in all parameters. Most notably, we find a factor 3.65 (local),
3.54 (equilateral), and 2.90 (orthogonal) improvement on the marginalized errors of f
NL as compared to only using the pre-reconstructed data. We show that these improvements can
be attributed to a combination of reduced data covariance and parameter degeneracy. The results
constitute an important step towards a more optimal inference of primordial non-Gaussianity from
non-linear scales.
Pion-photon and kaon-photon transition distribution amplitudes in the Nambu–Jona-Lasinio model*
Authors: Zhang 张 Jin-Li 金利 , Wu 吴 Jun 军 
Published: February 2024

Abstract
The Nambu–Jona-Lasinio model is utilized to investigate the pion- and kaon-photon leading-twist transition distribution amplitudes using proper time regularization. Separately, the properties of the vector and axial vector pion-photon transition distribution amplitudes are examined, and the results meet the desired properties. Our study involves sum rule and polynomiality condition. The vector and axial vector pion-photon transition form factors that are present in the

process are the first Mellin moments of the pion-photon transition distribution amplitudes. The vector transition form factor originates from the internal structure of hadrons, the axial current can be coupled to a pion, this pion is virtual, and its contribution will be present independently of the external hadrons. The kaon transition form factors are similar. The vector form factor's value at zero momentum transfer is determined by the axial anomaly, while this is not the case for the axial one. The vector and axial form factors, as well as the neutral pion vector form factor

, are depicted. According to our findings, the pion axial transition form factor is harder than the vector transition form factor and harder than the electromagnetic form factor. We also discuss the link between

and

transitions distribution amplitudes.
Different coalescence sources of light nucleus production in Au-Au collisions at
GeV*
Authors: Wang 王 Rui-Qin 瑞芹 , Lv 吕 Ji-Peng 济鹏 , Li 李 Yan-Hao 彦豪 , Song 宋 Jun 军 , Shao 邵 Feng-Lan 凤兰 
Published: February 2024

Abstract
We study the production of light nuclei in the coalescence mechanism of Au-Au collisions at midrapidity at

GeV. We derive analytic formulas of the momentum distributions of two bodies, three bodies, and four nucleons coalescing into light nuclei and naturally explain the transverse momentum spectra of the deuteron (d), triton (t), helium-3 (3He), and helium-4 (4He). We reproduce data on the yield rapidity densities, yield ratios, and averaged transverse momenta of d, t, 3He, and 4He and provide the proportions of contributions from different coalescence sources for t, 3He, and 4He in their production. We find that besides nucleon coalescence, nucleon+nucleus coalescence and nucleus+nucleus coalescence may play requisite roles in light nucleus production in Au-Au collisions at

GeV.
Micro-particle injection experiments in ADITYA-U tokamak using an inductively driven pellet injector
Authors: Pahari Sambaran , P.P. Rahulnath , Savita Aditya Nandan , Maurya Pradeep Kumar , Jha Saroj Kumar , Shiv Neeraj , K. Raghavendra , Hemani Harsh , Nagaraju Belli , Mahar Sukantam , Rao Manmadha , Suryaprasad I.V.V. , Malshe U.D. , Ghosh J. , Doshi B.R. , Chattopadhyay Prabal Kumar , Tanna R.L. , Jadeja K.A. , Patel K.M. , Kumar Rohit , Macwan Tanmay , Raj Harshita , Aich S. , Singh Kaushlender , Dolui Suman , Kumawat D. , Makwana M.N. , Shah K.S. , Gupta Shivam , Balakrishnan V. , Gupta C.N. , Patnaik Swadesh Kumar , Edappala Praveenlal , Shah Minsha , Kadia Bhavesh , Yadava Nandini , Shah Kajal , Shukla G. , Chowdhuri M.B. , Manchanda R. , Ramaiya Nilam , Kumar Manoj , Nagora Umesh , S. Varsha , Pathak S.K. , Asudani Kumudni , Chaudhuri Paritosh , Maya P.N. , Goswami Rajiv , Sen A. , Saxena Y.C. , Pal R. , Chaturvedi S. 
Published: February 2024

Abstract
A first-of-its-kind, inductively driven micro-particle (Pellet) accelerator and injector have been developed and operated successfully in ADITYA-U circular plasma operations, which may ably address the critical need for a suitable disruption control mechanism in ITER and future tokamak. The device combines the principles of electromagnetic induction, pulse power technology, impact, and fracture dynamics. It is designed to operate in a variety of environments, including atmospheric pressure and ultra-high vacuum. It can also accommodate a wide range of pellet quantities, sizes, and materials and can adjust the pellets’ velocities over a coarse and fine range. The device has a modular design such that the maximum velocity can be increased by increasing the number of modules. A cluster of lithium titanate/carbonate (Li2TiO3/Li2CO3) impurity particles with variable particle sizes, weighing ∼50–200 mg are injected with velocities of the order of ∼200 m s−1 during the current plateau in ADITYA-U tokamak. This leads to a complete collapse of the plasma current within ∼5–6 ms of triggering the injector. The current quench time is dependent on the amount of impurity injected as well as the compound, with Li2TiO3 injection causing a faster current quench than Li2CO3 injection, as more power is radiated in the case of Li2TiO3. The increase in radiation due to the macro-particle injection starts in the plasma core, while the soft x-ray emission indicates that the entire plasma core collapses at once.
Influence of working height on the energy consumption of an industrial robot
Authors: Bočák R , Holubek R , Kusá M 
Published: February 2024

Abstract
Electricity consumption is a big problem not only for the economy, but also for the environment. More and more electricity is used, so it is necessary to find a way to save it. This article focuses on the electrical energy consumption of an industrial robot by changing its working height. The goal is to find out at which height it is most suitable to work in order to achieve the lowest possible energy consumption. Research is realized on industrial robot ABB IRB 6700 using simulation tools such as ABB RobotStudio and Process Simulate, where different trajectory heights are simulated. The trajectories are dimensioned according to the size of the robot. Also, the trajectories are designed to maximize the use of the robot’s axis. This method makes it possible to reduce energy consumption even before the robot is physically located in the factory and its position cannot be changed.
Influence of Motion Mechanism Change in 3D Printers on the Quality of Printed Models
Authors: Csekei M , Šido J , Ružarosvský R , Michal D , Milde J 
Published: February 2024

Abstract
The objective of this study is to compare the quality of 3D printed models manufactured using the Fused Filament Fabrication (FFF) method. The samples were fabricated using a robotic arm with 4 axes and conventional 3D printers. The focus of this experiment lies in assessing the influence of the devices’ structural design on the resulting quality of the 3D printed models. Additionally, the study aims to identify the strengths and limitations of each device and define their respective applicability. The 3D model designed for this investigation comprises intricate geometrical shapes specifically chosen to evaluate the precision and repeatability of layer deposition while establishing geometric tolerances and determining shape deviations. The samples were 3D printed under identical printing conditions and parameters, and subsequently, these produced samples will undergo 3D digitization through an optical scanner, namely ATOS II Triple Scan. The obtained data will then be subjected to a comparative analysis utilizing GOM Inspect software to determine the geometric tolerances. The findings from this analysis will be critically evaluated and serve as a basis for informing and guiding future research endeavors.
Researches regarding power quality at the hot rolling mills’ power supply
Authors: Ivascanu P , Militaru G , Panoiu M , Panoiu C 
Published: February 2024

Abstract
The study described in the paper was carried out through measurements taken at a feed station in a hot rolling line. The aforementioned measures are appropriate for the purpose of analyzing power quality. The measurements were taken using a three-phase power quality analyzer. Measurements were taken for voltage and current values, as well as for active, reactive, and apparent powers. The analysis of the measurements taken indicates that the power quality is affected by the nonlinearity of the load. As a consequence, the level of reactive power becomes higher, leading to a reduced power factor.
RES growth linked to grid development. Case Study: Romania
Authors: Chioncel P C , Anghel-Drugărin C V , Tirian G O 
Published: February 2024

Abstract
The paper presents Romania to illustrate how more production capacities from renewable energy sources can be integrated as part of the environmental protection and geostrategic policies, in an accelerated energy transition process. Increasing electricity production, especially for the widespread development of wind turbines and rooftop solar PV systems, requires the development of the electrical grid and increased interconnection capacity. The authors of this report also take into account the behavior in different seasons, cold and warm, in terms of the amount of renewable energy injected into the network. The data used in the study is based on the interpreting and associations of various information at the national and European levels, highlighting that the benefits of renewable energy are not only seen in terms of significant reductions in environmental impact but also in terms of cheaper energy! In summary, it is assumed that in 2023-2026, the electricity demand at the level of quality indicators will be covered by investments in new generation facilities related to grid reinforcement measures.
Research regarding oxygen content reduction in steels
Authors: Poenaru I O , Ardelean E , Berghian A Budiul , Magaon M , Trisovic Z 
Published: February 2024

Abstract
Actual paperwork reflects obtained results of technological analyse of reducing oxygen content in steel for pipe manufacturing, enterprised in a steel furnance equipped with a triple aggregate EAF-LF-VD. Oxygen content was measured during manufacturing process in Loading Furnance and Vacuum Degasing and has been analysed in comparison with several parameters. The results are presented using Matlab through regression surfaces and correlation equations and highlights the influence of analysed factors on oxygen content variation in steel.
The variation of the hardness of high-strength steels depending on the microstructures specific of tempering
Authors: Mihuț G , Ardelean M , Popa E 
Published: February 2024

Abstract
The properties of steel depend on its chemical composition and structure. The modification of the structure in order to change the properties in a certain way is not only the main purpose of heat treatment, but also the only purpose, because the heat treatment regime influences the variation of properties through the variation of the steel structure.
It is only by correlating the variation in structure with hardness that we can answer how heat treatment influences hardness, which also depends on the stress state.
The tempering results are mainly influenced by the heating temperature, holding time and less sensitively by the tempering cooling rate (air, oil) as shown in the research carried out and presented in this paper.
Tempering reduces hardness, internal stresses, the amount of residual austenite and increases elongation, necking and resilience at the expense of strength.
The characteristics of tempering structures are clearly superior to equilibrium (annealing) structures in that the degree of dispersion of the structure is greater and the shape of the carbides and constituents is fine globular.
Positive maps from the walled Brauer algebra
Authors: Balanzó-Juandó Maria , Studziński Michał , Huber Felix 
Published: February 2024

Abstract
We present positive maps and matrix inequalities for variables from the positive cone. These inequalities contain partial transpose and reshuffling operations, and can be understood as positive multilinear maps that are in one-to-one correspondence with elements from the walled Brauer algebra. Using our formalism, these maps can be obtained in a systematic and clear way by manipulating partially transposed permutation operators under a partial trace. Additionally, these maps are reasonably easy in construction by combining an algorithmic approach with graphical calculus.