bluuebunny/crossref_metadata_2025_split huggingface dataset:
FIB-shield: a structure to safely transfer and precisely mount beam-sensitive TEM specimens under focused ion beam
Authors: Zhang Jiabao , Yang Xudong , Li Zhipeng , Cai Jixiang , zhang Jianfei , Han Xiaodong 
Published: November 2023

Abstract
Focused ion beam (FIB) has been adopted extensively for transmission electron microscope (TEM) sample preparation during the past decades. However, ion beam- and deposition-induced damage during transferring and mounting of the sample cannot be effectively avoided, limiting the application of FIB in ion-beam illumination-sensitive samples. A transferring device called the FIB shield is designed and fabricated to greatly reduce the damage and contamination of the sample during transfer and mounting under Ga+ beam imaging, milling and Pt deposition. Nearly damage-free transfer and precise positioning and attachment of beam-sensitive in situ TEM nanoindentation samples are achieved. The effectiveness of the shielding plate to block Ga+ radiation damage during Ga+ beam imaging and milling and that of the buffer region to alleviate sputtering damage during Pt deposition are verified by corresponding experiments.
Orbital stability of periodic wave solution for Eckhaus-Kundu equation
Authors: Hong Si-Yu , Zhang Wei-Guo , Guo Yu-Li , Ling Xing-Qian 
Published: November 2023

Abstract
In this paper, we mainly study the orbital stability of periodic traveling wave solution for the Eckhaus-Kundu equation with quintic nonlinearity, which is not a standard Hamilton system. Considering the studied equation is not a standard Hamilton system, the method presented by M. Grillakis and others for proving orbital stability cannot be applied directly, and this equation has two higher order nonlinear terms. So, by constructing three conserved quantities, using detailed spectral analysis and appropriate techniques, we overcome the complexity of the studied equation developed in calculation and proof, then, a conclusion on the orbital stability of the dn periodic wave solution for the Eckhaus-Kundu equation is obtained. As an extension of the proof for the above results, we also prove the orbital stability of the solitary wave for the studied Eckhaus-Kundu equation.
Explicit K-symplectic-like algorithms for guiding center system
Authors: Zhu Beibei , Liu Jian , Zhu Aiqing , Zhang Jiawei , Tang Yifa 
Published: November 2023

Abstract
In this paper, for the guiding center system, we propose a type of explicit K-symplectic-like methods by extending the original guiding center phase space and constructing new augmented Hamiltonians. The original guiding center phase space is extended by making several copies in order to make the guiding center Hamiltonian separable to variables. In the extended phase space, the augmented guiding center Hamiltonian can be numerically solved by a K-symplectic method through the splitting technique and the composition of some simpler subsystems. Meanwhile, a midpoint permutation constraint is imposed on the extended phase space. Numerical experiments are carried out for guiding center motions in different magnetic fields using different numerical methods, including K-symplectic-like algorithms, canonical symplectic algorithms, and higher order implicit Runge-Kutta methods. Results show that energy errors of K-symplectic-like methods are bounded within small intervals over a long time, defeating higher order implicit Runge-Kutta methods. For comparison, explicit K-symplectic-like methods exhibit higher computational efficiency than existing canonicalized symplectic methods of the same order. We also verify that permutation constraints are important for the numerical properties of explicit K-symplectic methods. Among them, the method with the midpoint permutation constraint behaves better in long-term energy conservation and the elimination of secular drift errors than the same method without any permutation. The permutation that imposes a constraint on the Hamiltonian behaves best in energy preservation.
The tensor of the exact circle: reconstructing geometry
Authors: Obster Dennis 
Published: November 2023

Abstract
Developing a theory for quantum gravity is one of the big open questions in theoretical high-energy physics. Recently, a tensor model approach has been considered that treats tensors as the generators of commutative non-associative algebras, which might be an appropriate interpretation of the canonical tensor model. In this approach, the non-associative algebra is assumed to be a low-energy description of the so-called associative closure, which gives the full description of spacetime including the high-energy modes. In the previous work it has been shown how to (re)construct a topological space with a measure on it, and one of the prominent examples that was used to develop the framework was the exact circle. In this work we will further investigate this example, and show that it is possible to reconstruct the full Riemannian geometry by reconstructing the metric tensor. Furthermore, it is demonstrated how diffeomorphisms behave in this formalism, firstly by considering a specific class of diffeomorphisms of the circle, namely the ellipses, and subsequently by performing an explicit diffeomorphism to ‘smoothen’ sets of points generated by the tensor rank decomposition.
Estimation of clutter covariance matrix in stap based on knowledge-aided and geometric methods
Authors: Jing Y , Du X L , Tian T W , Li J B , Li C X 
Published: November 2023

Abstract
The insufficient number of available samples can cause inaccurate estimation of the clutter covariance matrix (CCM) in space-time adaptive processing (STAP), resulting in degraded clutter suppression performance. To tackle this problem, a CCM estimation approach based on knowledge-aided (KA) and geometric methods is proposed in this paper. A combination of environmental as well as structural (Persymmetric or Symmetric structure) knowledge information is utilized to model the covariance matrix of each sample as a knowledge-aided Hermitian positive definite (KA-HPD) covariance matrix. The estimation problem is introduced into the Riemannian manifold composed of the KA-HPD covariance matrices, and the geometric method is used for nonlinear processing. Based on the Kullback-Leibler (KL) divergence and the KL mean, the final estimated CCM is designed as a weighted combination of each KA-HPD covariance matrix. Experiment results show that the two designed structural covariance matrix estimators possess superior clutter suppression performance.
Teleportation of superposed nonlinear coherent states
Authors: Anbaraki Azam , Afshar Davood 
Published: November 2023

Abstract
In this paper, we study the teleportation of nonlinear coherent cat states assuming even and odd nonlinear quasi-Bell states as the channel. Odd nonlinear quasi-Bell states are shown to be maximally entangled independent of the coherent parameter and also nonlinear function but the entanglement of the even nonlinear coherent states depends on the parameters involved. Subsequently, the teleportation probability is evaluated for some nonlinear functions. Our research reveals that when even and odd nonlinear quasi-Bell states are assumed as the quantum channel, the probabilities for successful teleportation are oppositely varied by increasing coherent parameter. For the special case of nonlinear harmonious states, the teleportation probability is a decreasing (increasing) function of the coherent parameter if even (odd) nonlinear quasi-Bell state is used as the channel.
Tin tellurium colloidal synthesis and spray pyrolysis thin films deposition: the ammonium hydroxide influence
Authors: Barron-Guzman K P , González G S Anaya , Alvarado-García J A , Pérez-Cuapio René , Carrera-Jota M L , Santiesteban H Juárez , Ortega-López Mauricio , Arce-Plaza Antonio 
Published: November 2023

Abstract
In this research a colloidal alternative route to synthesize

SnTe
,

and the influence of ammonium hydroxide into the

Sn

and

Te

phase formation at atmospheric conditions is reported. The obtained solutions at different ammonium concentration were analyzed through x-ray Diffraction to determine the structure and the

SnTe

phase. Meanwhile, Raman spectroscopy was used to analyze and discuss the presence of possible byproducts, those results were complemented by EDX analysis, as well as the morphology was analyzed by HRSEM. Albeit the resultant SnTe colloids were deposited as thin films by spray pyrolysis at 300 °C, following two deposit variations, the first one was one step deposition (continuous) and the second as an intermittent (I) where several layers were deposited. The resultant thin films were analyzed through HRSEM, XRD and profilometry correlating the morphology, and structural properties to those obtained from the colloids.
Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination
Authors: Nair Anjana S , Keerthana C S , James Jiya , Santhosh Kumar A , Vinod M , Saritha A C 
Published: November 2023

Abstract
Present work primarily aims to study the near infrared (NIR) reflecting property of tungsten oxide nanostructures synthesized using hydrothermal method. As-synthesized hydrated tungsten oxide (WO3. H2O) sample was subjected to calcination at temperatures 300, 600, 700, 800 and 900 °C respectively for 1 h and corresponding NIR reflecting performance of the obtained anhydrous tungsten oxide (WO3) nanostructures was analyzed using spectrophotometer. Thermal, structural, morphological, compositional and photoluminescence properties of the nanostructures were also characterized. Moreover, color variation of all samples was identified using CIE L*a*b* color analysis. The sample calcined at 600 °C showed a remarkable NIR reflectance of 91% with color coordinates L* = 70.21, a* = − 4.28, b* = 22.47, h* = 100.78°, and C* = 22.87. Particle size and oxygen vacancies were found to play a significant role in NIR reflectance ability of tungsten oxide. The present work provides new insight into developing NIR reflecting tungsten oxide powders to be used as environmentally friendly cool materials for buildings and automobiles with energy saving performance.
Exploring the impact of spontaneous emission in two quantum game-based key-distribution protocols
Authors: Quezada L F , Zhang Guo-Qing , Dong Shi-Hai 
Published: November 2023

Abstract
In this work, we investigate the influence that spontaneous emission has on the performance and security of both a qubit and a qutrit quantum key distribution protocols, if these were to be implemented using two- and three-level atoms, respectively. These protocols were developed based on the mechanics of a quantum version of the Monty-Hall game. In the case of three-level atoms, the three possible configurations (V, Ξ, Λ) are considered. In both protocols, an additional step, consisting on discarding some specific non-valid cases, is found to reduce the bit error ratio (BER). Regarding the security of the protocols, we are able to define secure regions, dependent on the spontaneous emission parameters, within which the protocols are deemed secure due to the violation of Bell-type inequalities. Furthermore, our results show that the choice of three-level atom configuration significantly impacts the protocol performance. We are able to determine that the Λ configuration provides a lower BER than the V and Ξ configurations within their respective secure regions.
The dipole of the Pantheon+SH0ES data
Authors: Sorrenti Francesco , Durrer Ruth , Kunz Martin 
Published: November 2023

Abstract
In this paper we determine the dipole in the distance redshift relation from the Pantheon+ data. We find that, while its amplitude roughly agrees with the dipole found in the cosmic microwave background which is attributed to the motion of the solar system with respect to the cosmic rest frame, the direction is different with a significance of slightly more than 3σ. While the amplitude depends on the lower redshift cutoff, the direction is quite stable. For redshift cuts of order z
cut ≃ 0.05 and higher, the dipole is no longer detected with high statistical significance. An important role seems to be played by the redshift corrections for peculiar velocities.
Stealth Ellis wormholes in Horndeski theories
Authors: Bakopoulos Athanasios , Chatzifotis Nikos , Erices Cristian , Papantonopoulos Eleftherios 
Published: November 2023

Abstract
In this work we are revisiting the well studied Ellis wormhole solution in a Horndeski theory motivated from the Kaluza-Klein compactification procedure of the more fundamental higher dimensional Lovelock gravity. We show that the Ellis wormhole is analytically supported by a gravitational theory with a non-trivial coupling to the Gauss-Bonnet term and we expand upon this notion by introducing higher derivative contributions of the scalar field. The extension of the gravitational theory does not yield any back-reacting component on the spacetime metric, which establishes the Ellis wormhole as a stealth solution in the generalized framework. We propose two simple mechanisms that dress the wormhole with an effective ADM mass. The first procedure is related to a conformal transformation of the metric which maps the theory to another Horndeski subclass, while the second one is inspired by the spontaneous scalarization effect on black holes.
Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: quasinormal modes and ringdown waveforms
Authors: Liu Wentao , Fang Xiongjun , Jing Jiliang , Wang Jieci 
Published: November 2023

Abstract
In this paper, we present a black hole solution with a cosmological constant in the Scalar-Tensor-Vector Modified Gravity (MOG) theory, where the strength of the gravitational constant is determined by G = G
N(1 + α).
We derive the master equations for gravito-electromagnetic perturbations and numerically solve for the Quasinormal Mode (QNM) spectrum and the ringdown waveforms.
Our research results show that increasing the MOG parameter α leads to a decrease in both the real and imaginary parts of the QNM frequencies for electromagnetic and gravitational modes.
Similarly, increasing the cosmological constant Λ also results in a decrease in both the real and imaginary parts of the QNM frequencies for these modes.
These trends are observed when compared to standard Schwarzschild-de Sitter (S-dS) or MOG black holes, respectively.
Meanwhile, the result indicates that in the MOG-de Sitter spacetime, the frequencies for electromagnetic and gravitational modes display isospectrality, and exhibit the same ringdown waveforms.
Our findings have implications for the ringdown phase of mergers involving massive compact objects, which is of particular relevance given the recent detections of gravitational waves by LIGO.
Spin-1 thermal targets for dark matter searches at beam dump and fixed target experiments
Authors: Catena Riccardo , Gray Taylor R. 
Published: November 2023

Abstract
The current framework for dark matter (DM) searches at beam dump and fixed target
experiments primarily relies on four benchmark models, the so-called complex scalar, inelastic
scalar, pseudo-Dirac and finally, Majorana DM models. While this approach has so far been
successful in the interpretation of the available data, it a priori excludes the possibility that
DM is made of spin-1 particles — a restriction which is neither theoretically nor experimentally
justified. In this work we extend the current landscape of sub-GeV DM models to a set of models
for spin-1 DM, including a family of simplified models (involving one DM candidate and one
mediator — the dark photon) and an ultraviolet complete model based on a non-abelian gauge group
where DM is a spin-1 Strongly Interacting Massive Particle (SIMP). For each of these models, we
calculate the DM relic density, the expected number of signal events at beam dump experiments such
as LSND and MiniBooNE, the rate of energy injection in the early universe thermal bath and in the
Intergalactic Medium (IGM), as well as the helicity amplitudes for forward processes subject to
the unitary bound. We then compare these predictions with experimental results from Planck, CMB
surveys, IGM temperature observations, LSND, MiniBooNE, NA64, and BaBar and with available
projections from LDMX and Belle II. Through this comparison, we identify the regions in the
parameter space of the models considered in this work where DM is simultaneously thermally
produced, compatible with present observations, and within reach at Belle II and, in particular,
at LDMX. We find that the simplified models considered here are strongly constrained by current
beam dump experiments and the unitarity bound, and will thus be conclusively probed
(i.e. discovered or ruled out) in the first stages of LDMX data taking. We also find that the
vector SIMP model explored in this work predicts the observed DM relic abundance, is compatible
with current observations and within reach at LDMX in a wide region of the parameter space of the
theory.
Gravitational lensing in modified gravity: a case study for Fast Radio Bursts
Authors: Kalita Surajit , Bhatporia Shruti , Weltman Amanda 
Published: November 2023

Abstract
Over the last few decades, a plethora of modifications to general relativity have been proposed to solve a host of cosmological and astrophysical problems. Many modified gravity models are now ruled out with further astrophysical observations; some theories are still viable, with, at best, bounds on their parameters set by observations to date. More recently, observations of Fast Radio Bursts have proven to be remarkably powerful tools to constrain cosmology and fundamental physics. In this work, we consider a generic modified gravity theory and consider the implications for gravitational lensing with Fast Radio Bursts. We use a set of Fast Radio Burst observations to constrain the fraction of dark matter made up of primordial black holes in such a theory. We further show that modified gravity adds a screening effect on gravitational lensing similar to the case when there is plasma in the path of the light ray acting as a scattering screen.
Tidal disruption of white dwarfs in a modified gravity theory with SPH
Authors: Garain Debojyoti , Banerjee Pritam , Chowdhury Shaswata , Sarkar Tapobrata 
Published: November 2023

Abstract
Low energy imprints of modifications to general relativity are often found in pressure balance equations inside stars. These modifications are then amenable to
tests via astrophysical phenomena, using observational effects in stellar astrophysics that crucially depend on such equations. One such effect is tidal disruption of stars in the vicinity of black holes. In this paper, using a numerical scheme modelled with smoothed particle hydrodynamics, we study real time tidal disruption of a class of white dwarfs by intermediate-mass black holes, in the low energy limit of a theory of modified gravity that alters the internal physics of white dwarfs,
namely the Eddington inspired Born-Infeld theory. In this single parameter extension of general relativity,
the mass-radius relation of white dwarfs as well as their tidal disruption radius depend on the modified gravity parameter, and these capture the effect of modifications to general relativity.
Our numerical simulations incorporating these show that departure from general relativity in these scenarios might be observationally significant, and should
therefore be contrasted with data. In particular, we study observationally relevant
physical quantities, i.e., tidal kick velocity and trajectory deviation of the remnant core and fallback rates of the tidal debris in this theory and compare them to the Newtonian limit of general relativity. We also comment on
the qualitative differences between the modified gravity theory and one with stellar rotation.
Improving the predictability of compound dry and hot extremes through complexity science
Authors: Guntu Ravi Kumar , Agarwal Ankit 
Published: November 2023

Abstract
Compound dry and hot extremes (CDHE) will have an adverse impact on socioeconomic factors during the Indian summer monsoon, and a future exacerbation is anticipated. The occurrence of CDHE is influenced by teleconnections, which play a crucial role in determining its likelihood on a seasonal scale. Despite the importance, there is a lack of studies unraveling the teleconnections of CDHE in India. Previous investigations specifically focused on the teleconnections between precipitation or temperature and climate indices. Hence, there is a need to unravel the teleconnections of CDHE. In this study, we present a framework that combines event coincidence analysis (ECA) with complexity science. ECA evaluates the synchronization between CDHE and climate indices. Subsequently, complexity science is utilized to construct a driver-CDHE network to identify the key drivers of CDHE. To evaluate the effectiveness of the proposed drivers, a logistic regression model is employed. The occurrence of CDHE exhibits distinct patterns from July to September when considering intra-seasonal variability. Our findings contribute to the identification of drivers associated with CDHE. The primary driver for Eastern, Western India and Central India is the indices in the Pacific Ocean and Atlantic Ocean, respectively, followed by the indices in the Indian Ocean. These identified drivers outperform the traditional Niño 3.4-based predictions. Overall, our results demonstrate the effectiveness of integrating ECA and complexity science to enhance the prediction of CDHE occurrences.
Different bactericidal abilities of plasma-activated saline with various reactive species prepared by surface plasma-activated air and plasma jet combinations
Authors: JIA 贾 Yikang 怡康 , LI 李 Tianhui 甜会 , ZHANG 张 Rui 瑞 , ZHAO 赵 Pengyu 鹏瑜 , WANG 王 Zifeng 子丰 , CHEN 陈 Min 旻 , GUO 郭 Li 莉 , LIU 刘 Dingxin 定新 
Published: November 2023

Abstract
Plasma-activated water (PAW), as an extended form of cold atmospheric-pressure plasma, greatly expands the application of plasma-based technology. The biological effects of PAW are closely related to the aqueous reactive species, which can be regulated by the activation process. In this study, surface plasma-activated air (SAA) and a He + O2 plasma jet (Jet) were parallelly combined (the SAA + Jet combination) or sequentially combined (the SAA → Jet combination and the Jet → SAA combination) to prepare plasma-activated saline (PAS). The PAS activated by the combinations exhibited stronger bactericidal effects than that activated by the SAA or the Jet alone. The concentrations of H2O2 and

were higher in the PAS activated by the Jet → SAA combination, while ONOO− concentrations were close in the three kinds of PAS and 1O2 concentrations were higher in the PAS activated by the SAA + Jet combination. The analysis of scavengers also demonstrated that H2O2, 1O2, and ONOO‒ in the PAS activated by the SAA + Jet combination, and 1O2 in the PAS activated by the Jet → SAA combination played critical roles in bactericidal effects. Further, the effective placement time of the three PAS varied, and the PAS activated by the Jet → SAA combination could also inactivate 2.6-log10 of MRSA cells after placement for more than 60 min. The regulation of reactive species in plasma-activated water via different combinations of plasma devices could improve the directional application of plasma-activated water in the biomedical field.