bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of the A-site cation on structural, morphological, magnetic, optical and transport properties of R2CoMnO6(R = Nd, Y, Ho and Er) double perovskite oxides
Authors: Nissar Umair , Ahmad Javed 
Published: January 2023

Abstract
The A-site substituted double perovskite oxides (DPOs) have in the recent decades gained much attention due to their various interesting properties and possible applications. For this reason, R2CoMnO6 (R = Nd, Y, Ho, and Er) DPOs have been synthesized using the auto-combustion sol-gel method. X-ray diffraction analysis suggests the crystal structure, i.e., monoclinic for all under-investigated DPOs at room temperature (RT), consisting of space group P2

1

/n which is confirmed by Rietveld refinement. Crystallite size is calculated using Scherrer and Williamson-Hall methods, and it was found that the crystallite size decreased with decreasing ionic radii from 55–29 nm on average. The micrographs were obtained by using a field-emission scanning electron microscope (FE-SEM), which reveals an almost homogeneous distribution of grains throughout the surface of all DPOs. All observed infrared and Raman active phonon modes have been assigned to vibrations of atoms and groups of atoms consistent with the prediction of group theory. The intermediate band gap values (1.34–1.63 eV) determined by the Tauc relations suggest the semiconducting nature of these DPOs which makes them promising materials for photovoltaic applications. Dc electrical resistivity and dielectric measurements also suggest semiconducting behaviour above ambient temperature, which is attributed to a small polaron hopping conduction mechanism. The Maxwell-Wagner type interfacial polarization has described the nature of the frequency-dependent dielectric constants in these DPOs. The dielectric (ac) study also suggests the small polaron hopping conduction mechanism in all samples, which supports our findings in resistivity measurements.
Fast-forward adiabatic quantum dynamics of XY spin model on three spin system
Authors: Setiawan Iwan , Ekawita Riska , Sugihakim Ryan , Gunara Bobby Eka 
Published: January 2023

Abstract
We discussed a method to accelerate an adiabatic quantum dynamics of XY spin model by using the fast-forward method proposed by Masuda and Nakamura. The Accelerated scheme is constructed by adding the driving Hamiltonian to the original Hamiltonian and speeding it up with a large time-scaling factor and an adiabatic parameter that realizes adiabatic quantum dynamics in a shortened time. Accelerated adiabatic dynamics start by assuming the candidate of driving Hamiltonian consists of the pair-wise exchange interaction and magnetic field. The driving Hamiltonian terms multiplied by the velocity function together with the original Hamiltonian give fast-forward driving for adiabatic states. We apply our method to XY spin model by considering three spin systems on the Kagome lattice. In this model, we obtained the XY pair-wise exchange interaction of nearest neighbors and next-nearest neighbors should be added to the original Hamiltonian as a driving interaction to accelerate the adiabatic motion. This pair-wise driving interaction in the fast-forward scheme guarantees the complete fidelity of accelerated states.
Testing quantum computers with the protocol of quantum state matching
Authors: Ortega Adrian , Kálmán Orsolya , Kiss Tamás 
Published: January 2023

Abstract
The presence of noise in quantum computers hinders their effective operation. Even though quantum error correction can theoretically remedy this problem, its practical realization is still a challenge. Testing and benchmarking noisy, intermediate-scale quantum (NISC) computers is therefore of high importance. Here, we suggest the application of the so-called quantum state matching protocol for testing purposes. This protocol was originally proposed to determine if an unknown quantum state falls in a prescribed neighborhood of a reference state. We decompose the unitary specific to the protocol and construct the quantum circuit implementing one step of the dynamics for different characteristic parameters of the scheme and present test results for two different IBM quantum computers. By comparing the experimentally obtained relative frequencies of success to the ideal success probability with a maximum statistical tolerance, we discriminate statistical errors from device specific ones. For the characterization of noise, we also use the fact that while the output of the ideal protocol is insensitive to the internal phase of the input state, the actual implementation may lead to deviations. For systematically varied inputs we find that the device with the smaller quantum volume performs better on our tests than the one with larger quantum volume, while for random inputs they show a more similar performance.
Skyrmion state stabilized by short-range interactions in centrosymmetric materials
Authors: Li W C , Liu Z Q , Xie D , Yao X W 
Published: January 2023

Abstract
Magnetic frustration can induce interesting magnetic phases including skyrmion state in centrosymmetric materials. By means of Monte Carlo simulations, we theoretically study the frustrated J
1–J
2 classical Heisenberg model on the triangular lattice. Both h
1–J
2 and h–T phase diagrams show rich magnetic phases, and skyrmion state can be stabilized by J
2. These results can be qualitatively explained by energy competitions, and indicate that skyrmion can be driven by the competition of short-range interactions in absence of DM interaction. This may help us to design and apply the skyrmion devices more easily in the future.
A novel chaotic map with a shifting parameter and stair-like bifurcation diagram: dynamical analysis and multistability
Authors: Ramadoss Janarthanan , Natiq Hayder , Nazarimehr Fahimeh , He Shaobo , Rajagopal Karthikeyan , Jafari Sajad 
Published: January 2023

Abstract
In this paper, the behavior of a 1D chaotic map is proposed which includes two sine terms and shows unique dynamics. By varying the bifurcation parameter, the map has a shift, and the system’s dynamics are generated around the cross points of the map and the identity line. The irrational frequency of the sine term makes the system have stable fixed points in some parameter intervals by increasing the bifurcation parameter. So, the bifurcation diagram of the system shows that the trend of the system’s dynamics changes in a stair shape with slope one by changing the bifurcation parameter. Due to the achieving multiple steady states in some intervals of the parameter, the proposed system is known as multistable. The multistability dynamics of the map are investigated with the help of cobweb diagrams which reveal an interesting asymmetry in repeating parts of the bifurcation diagram.
Limits on the nuclearite flux using the ANTARES neutrino telescope
Authors: Albert A. , Alves S. , André M. , Ardid M. , Ardid S. , Aubert J.-J. , Aublin J. , Baret B. , Basa S. , Belhorma B. , Bendahman M. , Benfenati F. , Bertin V. , Biagi S. , Bissinger M. , Boumaaza J. , Bouta M. , Bouwhuis M.C. , Brânzaş H. , Bruijn R. , Brunner J. , Busto J. , Caiffi B. , Calvo D. , Capone A. , Caramete L. , Carr J. , Carretero V. , Celli S. , Chabab M. , Chau T. N. , Cherkaoui El Moursli R. , Chiarusi T. , Circella M. , Coelho J.A.B. , Coleiro A. , Coniglione R. , Coyle P. , Creusot A. , Díaz A.F. , de Wasseige G. , De Martino B. , Distefano C. , Di Palma I. , Domi A. , Donzaud C. , Dornic D. , Drouhin D. , Eberl T. , van Eeden T. , van Eijk D. , El Khayati N. , Enzenhöfer A. , Fermani P. , Ferrara G. , Filippini F. , Fusco L. , García J. , Gay P. , Glotin H. , Gozzini R. , Gracia Ruiz R. , Graf K. , Guidi C. , Hallmann S. , van Haren H. , Heijboer A.J. , Hello Y. , Hernández-Rey J.J. , Hößl J. , Hofestädt J. , Huang F. , Illuminati G. , James C.W. , Jisse-Jung B. , de Jong M. , de Jong P. , Kadler M. , Kalekin O. , Katz U. , Kouchner A. , Kreykenbohm I. , Kulikovskiy V. , Lahmann R. , Lamoureux M. , Le Breton R. , Lefèvre D. , Leonora E. , Levi G. , Le Stum S. , Lopez-Coto D. , Loucatos S. , Maderer L. , Manczak J. , Marcelin M. , Margiotta A. , Marinelli A. , Martínez-Mora J.A. , Melis K. , Migliozzi P. , Moussa A. , Muller R. , Nauta L. , Navas S. , Nezri E. , Ó Fearraigh B. , Păun A. , Păvălaş G.E. , Pellegrino C. , Perrin-Terrin M. , Pestel V. , Piattelli P. , Pieterse C. , Poirè C. , Popa V. , Pradier T. , Randazzo N. , Real D. , Reck S. , Riccobene G. , Romanov A. , Sánchez-Losa A. , Salesa Greus F. , Samtleben D. F. E. , Sanguineti M. , Sapienza P. , Schnabel J. , Schumann J. , Schüssler F. , Seneca J. , Spurio M. , Stolarczyk Th. , Taiuti M. , Tayalati Y. , Tingay S.J. , Vallage B. , Van Elewyck V. , Versari F. , Viola S. , Vivolo D. , Wilms J. , Zavatarelli S. , Zegarelli A. , Zornoza J.D. , Zúñiga J. 
Published: January 2023

Abstract
In this work, a search for nuclearites of strange quark matter by using nine years of ANTARES data taken in the period 2009–2017 is presented. The passage through matter of these particles is simulated taking into account a detailed description of the detector response to nuclearites and of the data acquisition conditions. A down-going flux of cosmic nuclearites with Galactic velocities (β = 10-3) was considered for this study. The mass threshold for detecting these particles at the detector level is 4 × 1013 GeV/c
2. Upper limits on the nuclearite flux for masses up to 1017 GeV/c
2 at the level of ∼ 5 × 10-17 cm-2 s-1 sr-1 are obtained. These are the first upper limits on nuclearites established with a neutrino telescope and the most stringent ever set for Galactic velocities.
Constraints on early dark energy from the axion weak gravity conjecture
Authors: Rudelius Tom 
Published: January 2023

Abstract
A popular proposal for resolving the Hubble tension involves an early phase of dark energy, driven by an axion field with a periodic potential. In this paper, we argue that these models are tightly constrained by the axion weak gravity conjecture: for typical parameter values, the axion decay constant must satisfy f < 0.008,M
Pl, which is smaller than the axion decay constants appearing in the vast majority of early dark energy models to date. We discuss possible ways to evade or loosen this constraint, arguing that its loopholes are small and difficult to thread. This suggests that it may prove challenging to realize early dark energy models in a UV complete theory of quantum gravity.
Enhance primordial black hole abundance through the non-linear processes around bounce point
Authors: Chen Jie-Wen , Zhu Mian , Yan Sheng-Feng , Wang Qing-Qing , Cai Yi-Fu 
Published: January 2023

Abstract
The non-singular bouncing cosmology is an alternative paradigm to inflation,
wherein the background energy density vanishes at the bounce point, in the context of Einstein gravity.
Therefore, the non-linear effects in the evolution of density fluctuations (δρ) may be strong in the bounce phase,
which potentially provides a mechanism to enhance the abundance of primordial black holes (PBHs).
This article presents a comprehensive illustration for PBH enhancement due to the bounce phase.
To calculate the non-linear evolution of δρ, the Raychaudhuri equation is numerically solved here.
Since the non-linear processes may lead to a non-Gaussian probability distribution function for δρ after the bounce point,
the PBH abundance is calculated in a modified Press-Schechter formalism.
In this case, the criterion of PBH formation is complicated,
due to complicated non-linear evolutionary behavior of δρ during the bounce phase.
Our results indicate that the bounce phase indeed has potential to enhance the PBH abundance sufficiently.
Furthermore, the PBH abundance is applied to constrain the parameters of bounce phase,
providing a complementary to the surveys of cosmic microwave background and large scale structure.
Complexity of charged anisotropic spherically symmetric fluids in

f()

gravity
Authors: Yousaf Z , Bhatti M Z , Nasir M M M 
Published: January 2023

Abstract
The previous ideology of complexity factor for the dynamical spheres [Herrera et al 2018, Phys. Rev. D, 98, 104059] is extended for the influence of charge. A dynamical spherically symmetric non-dissipative and dissipative self-gravitating structure is examined in the presence of Maxwell

f
(

)

gravity to examine the complexity factor. The pattern of evolution is studied with the minimal complexity constraint. The complexity factor remains the same for the structure of fluid distribution, while we examine homologous constraints for the most basic evolution pattern. We calculate the structure scalars which play an important role in order to understand the fundamental properties of the system. The fluid is geodesic as well as shearing for the dissipative case and there is a large number of solutions. In the non-dissipative fluid distribution, a shear-free, homogeneous and isotropic, geodesic fluid correlates with the evolving homologous and vanishing complexity condition. The implication of the condition of vanishing complexity factor and stability are discussed at the end.
Mapping the representativeness of precipitation measurements in Mainland China
Authors: Zhang Yan , Wang Kaicun 
Published: January 2023

Abstract
Meteorological observations provide essential data for weather forecasting and climate change studies. Whether the measured data can accurately support such applications closely relates to the representativeness of the data collected, which depends on both the scale of observation and the density of the measurement network. Precipitation presents in the form of events and is discontinuous both in time and space. Gauge observations of precipitation could provide fundamental data but have difficulty quantitatively assessing precipitation system scale. Therefore, assessments on the representativeness of precipitation at synoptic and climatological scales remain needed. Here, we show the first high-resolution map of the representativeness of precipitation over Mainland China based on the latest satellite data. Our results show that the daily precipitation spatial consistency is the highest in eastern China and lowest on the Tibetan Plateau. However, the pattern of the monthly spatial consistency is different and is the highest over Northeast China Plain, the Loess Plateau, and the Middle–Lower Yangtze Plain. Compared to the density of rain gauges, we find that the current national station network with ∼2400 stations still has difficulty supporting synoptic studies in western China. However, for climate change studies based on monthly data, the density of the national reference climatological station network is sufficient, except in the western Tibetan Plateau and deserts with no available stations. For climatological studies, the quality of precipitation gauge observations is more important than its spatial density. Our results could provide great practical significance for considering the layout of rain gauges.
Preparation and properties of epoxy resin modified with phosphorus and nitrogen flame retardants
Authors: Wang Chenghui , Zhang Yingqiang , Wang Xinyu 
Published: January 2023

Abstract
Epoxy resins (EPs) require the addition of flame retardants to extend their application scope. High-efficiency flame retardants typically contain halogens, which can cause tremendous harm to humans and the environment. In this study, we investigated the syntheses of new phosphorus–nitrogen flame retardants (DIT) and flame-retardant EP. DIT is composed of 6-(2,5-dihydroxyphenyl) dibenzo[c,e][1,2] oxaphosphinine 6-oxide, 5-isocyanato-1-(isocyanatomethyl)−1,3,3-trimethylcyclohexane, and tris-(2-hydroxyethyl) isocyanurate. DIT chemical structure was analysed by Fourier-transform infrared spectroscopy. Several formulations of modified epoxy resins (DIT-EPs) were obtained by adding different quantities of DITs. We found that when the flame retardant content reached 25%, the limiting oxygen index of the DIT-EP was 29.0%. This finding expands the application range of EPs.
Optimization of adsorption of methyl orange from aqueous solution by magnetic CoFe2O4/ZnAl-layered double hydroxide composite using response surface methodology
Authors: Desalegn Yiene Molla , Bekele Endrias Adane , Amibo Temesgen Abeto , Desissa Temesgen Debelo 
Published: January 2023

Abstract
The CoFe2O4/ZnAl-layered double hydroxide (LDH) composite was successfully developed through a facile co-precipitation method, characterized, and applied as an effective adsorbent for the removal of methyl orange (MO) dye from aqueous solutions. The central composite design (CCD) of the response surface methodology (RSM) was employed to estimate and optimize process variables such as initial MO concentrations, solution pH, adsorbent dosage, and contact time. 98.878% adsorption efficiency was obtained at an initial concentration of 18.747 mg l−1 of MO, with an adsorbent dosage of 0.048 g, a solution pH of 2.770, and a contact time of 85.890 min. Analysis of variance (ANOVA) confirmed the significance of the predicted model (R2 = 0.9844). Kinetic and equilibrium studies indicated that the experimental data for MO adsorption were best described by pseudo-second-order kinetic and Langmuir models. The maximum monolayer adsorption capacity of the CoFe2O4/ZnAl-LDH for MO was 42.3 mg g−1.
Local wavelength evolution and Landau damping of electrostatic plasma wave driven by an ultra-relativistic electron beam in dense inhomogeneous plasma
Authors: LI Ran , HUANG Taiwu , YU Mingyang , ZHOU Cangtao , RUAN Shuangchen 
Published: January 2023

Abstract
Evolution of an electrostatic plasma wave driven by a low-density ultra-relativistic electron beam in dense inhomogeneous plasma is considered. In particular, the wavelength variation as observed at fixed locations in the plasma is analyzed in terms of the wave characteristics. It is shown that for a negative density gradient, the observed local wavelength decreases monotonically with time, but for a positive density gradient, it first increases and then decreases with time, accompanied by reversal of the wave phase. However, in both cases the local wavelength eventually decreases with time since Landau damping becomes significant as the wavelength becomes of the order of the plasma Debye length. Results from particle-in-cell simulations agree well with theoretical analyses of the wavelength variation.
Investigation of gyrotron-based collective Thomson scattering for fast ion diagnostics in a compact high-field tokamak
Authors: XU Dengfeng , HUANG Mei , CHEN Xixuan , ZHANG Feng , XIA Donghui , WANG Zhijiang , PAN Yuan 
Published: January 2023

Abstract
As a promising method for fast ion diagnostics, collective Thomson scattering (CTS) can measure the one-dimensional velocity distribution of fast ions with high spatial and temporal resolution. The feasibility of diagnosing fast ions in a compact high-field tokamak by CTS was studied in this work, and the results showed that a wide range of probing frequencies could be applied. A high-frequency case and a low-frequency case were mainly considered for fast ion diagnostics in a compact high-field tokamak. The use of a high probing frequency could effectively avoid the refraction effect of the beams, while the application of a low probing frequency allows greater flexibility in the selection of scattering angle which may help to improve the spatial resolution. Based on typical plasma conditions (B
0 = 12.2 T, n
e0 = 4.3 × 1020 m−3, T
e0 = 22.2 keV, T
i0 = 19.8 keV) for a compact high-field tokamak, a 220 GHz CTS diagnostic that utilizes a small scattering angle of θ = 30° and a 160 GHz CTS diagnostic that utilizes an orthogonal geometry were proposed. Further study showed that the high-frequency case could operate in a wider range of plasma conditions and provide more information on fast ions while the low-frequency case could achieve higher spatial resolution of the poloidal direction.
Flip chip bonding on stretchable printed substrates; the effects of stretchable material and chip encapsulation
Authors: Malik Muhammad Hassan , Kaczynski Jaroslaw , Zangl Hubert , Roshanghias Ali 
Published: January 2023

Abstract
Stretchable printed electronics have recently opened up new opportunities and applications, including soft robotics, electronic skins, human-machine interfaces, and healthcare monitoring. Stretchable hybrid systems (SHS) leverage the benefits of low-cost fabrication of printed electronics with high-performance silicon technologies. However, direct integration of silicon-based devices on conventional stretchable substrates such as thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) is extremely challenging due to their restricted low-temperature processing. In this study, a recently developed thermoset, stretchable substrate (BeyolexTM) with superior thermal and mechanical properties was employed to realize SHS via direct flip chip bonding. Here, ultra-thin chips (UTC) with a fine-pitch, daisy-chain structure was flip-chip bonded by using anisotropic conductive adhesives, while the complementary circuitry was facilitated via screen-printed, stretchable silver tracks. The bonded samples successfully passed reliability assessments after being subjected to cyclic 30% stretch tests for 200 cycles. The potential benefits of chip encapsulation after integration with the stretchable substrate to withstand larger strains were demonstrated by both mechanical simulation and experimental results.
A recipe for cracking the quantum scaling limit with machine learned electron densities
Authors: Rackers Joshua A , Tecot Lucas , Geiger Mario , Smidt Tess E 
Published: January 2023

AbstractA long-standing goal of science is to accurately simulate large molecular systems using quantum mechanics. The poor scaling of current quantum chemistry algorithms on classical computers, however, imposes an effective limit of about a few dozen atoms on traditional electronic structure calculations. We present a machine learning (ML) method to break through this scaling limit for electron densities. We show that Euclidean neural networks can be trained to predict molecular electron densities from limited data. By learning the electron density, the model can be trained on small systems and make accurate predictions on large ones. In the context of water clusters, we show that an ML model trained on clusters of just 12 molecules contains all the information needed to make accurate electron density predictions on cluster sizes of 50 or more, beyond the scaling limit of current quantum chemistry methods.
Machine and quantum learning for diamond-based quantum applications
Authors: Stone Dylan G , Bradac Carlo 
Published: January 2023

Abstract
In recent years, machine and quantum learning have gained considerable momentum sustained by growth in computational power and data availability and have shown exceptional aptness for solving recognition- and classification-type problems, as well as problems that require complex, strategic planning. In this work, we discuss and analyze the role machine and quantum learning are playing in the development of diamond-based quantum technologies. This matters as diamond and its optically addressable spin defects are becoming prime hardware candidates for solid state-based applications in quantum information, computing and metrology. Through a selected number of demonstrations, we show that machine and quantum learning are leading to both practical and fundamental improvements in measurement speed and accuracy. This is crucial for quantum applications, especially for those where coherence time and signal-to-noise ratio are scarce resources. We summarize some of the most prominent machine and quantum learning approaches that have been conducive to the presented advances and discuss their potential, as well as their limits, for proposed and future quantum applications.