bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulations of two-temperature jets in galaxy clusters
Authors: Ohmura T. , Machida M. , Akamatsu H. 
Published: October 2023

Context. Forward shocks by radio jets, driven into the intracluster medium, are one of the indicators that can be used to evaluate the power of the jet. Meanwhile, high-angular-resolution X-ray observations show the Mach numbers of powerful radio jets are smaller compared to the results of theoretical and numerical studies, namely, ℳobs < 2.
Aims. Our aim is to systematically investigate various factors, such as projection effects and temperature non-equilibration between protons and electrons, that influence the Mach number estimate in a powerful jet.
Methods. Using a two-temperature magnetohydrodynamic simulation data for the Cygnus A radio jets, whose Mach number is approximately 6, we constructed mock X-ray maps of simulated jets from various viewing angles. Furthermore, we evaluated the shock Mach number from the density-temperature jump using the same method of X-ray observations.
Results. Our results demonstrate that measurements from the density jump significantly underestimate the Mach numbers, ℳ < 2, around the jet head at a low viewing angle, ⪅50°. The observed post-shock temperature is strongly reduced by the projection effect, as our jet is in the cluster center where the gas density is high. On the other hand, the temperature jump is almost at unity, even if thermal electrons are in instant equilibration with protons. Upon comparison, we find that the shock property of our model at a viewing angle of < 55° is in good agreement with the results of Cygnus A observations.
Conclusions. These works illustrate the importance of the projection effect in estimating the Mach number from the surface brightness profile. Furthermore, forward shock Mach numbers could serve as a useful probe for determining viewing angles for young, powerful radio jets.
Dynamical properties and detectability of the magneto-thermal instability in the intracluster medium
Authors: Kempf J. M. , Rincon F. , Clerc N. 
Published: October 2023

Context.Amongst the many plasma processes potentially relevant to the dynamics of the intracluster medium (ICM), turbulence driven at observable scales by internal magnetised buoyancy instabilities such as the magneto-thermal instability (MTI) stands out in the outskirts of the ICM, where the background temperature decreases with the radius.Aims.We characterise the statistical properties of MTI turbulence in the ICM and assess whether such large-scale magnetised plasma dynamics would be detectable with the future X-ray calorimeter X-IFU on board Athena.Methods.We made use of scaling laws previously derived to phenomenologically estimate the observable turbulent saturation levels and injection length of MTI turbulence for different ICM thermodynamic profiles, and performed a numerical magnetohydrodynamic simulation of the dynamics with Braginskii heat and momentum diffusion. As a prospective exercise, we used the simulation to virtually observe MTI turbulence through the X-IFU.Results.In bright enough regions amenable to X-ray observations, the MTI drives mild turbulence up to ∼5% and ∼100 km s−1(root-mean square temperature fluctuation and velocity). However, the measurable integrated temperature fluctuation and line-of-sight velocity fields, the latter being essentially the azimuthal velocity component in cluster haloes, hardly exceed 1% and 10 km s−1, respectively (root-mean square). We show that such moderate signals would be difficult to detect with upcoming X-ray telescopes. We also find that MTI turbulence is anisotropic in the direction of gravity and develops at scales ≳0.2 Mpc. If the fluctuation intensities were to be stronger than the current theoretical estimates, MTI fluctuations would be detectable and their anisotropy discernible with the X-IFU.Conclusions.Finding direct signatures of magnetised plasma dynamics in the ICM, even at observable scales typical of the fluid MTI, remains challenging. This study only marks a first step in this direction. Several numerical and observational strategies are discussed to make further progress in the future.
Inverse-problem versus principal component analysis methods for angular differential imaging of circumstellar disks
Authors: Juillard S. , Christiaens V. , Absil O. 
Published: October 2023

Context. Circumstellar disk images have highlighted a wide variety of morphological features. Recovering disk images from high-contrast angular differential imaging (ADI) sequences is, however, generally affected by geometrical biases, leading to unreliable inferences of the morphology of extended disk features. Recently, two types of approaches have been proposed to recover more robust disk images from ADI sequences: iterative principal component analysis (I-PCA) and inverse problem (IP) approaches.
Aims. We introduce mustard, a new IP-based algorithm specifically designed to address the problem of the flux invariant to rotation in ADI sequences – a limitation inherent to the ADI observing strategy – and discuss the advantages of IP approaches with respect to PCA-based algorithms.
Methods. The mustard model relies on the addition of morphological priors on the disk and speckle field to a standard IP approach to tackle rotation-invariant signals in circumstellar disk images. We compared the performance of mustard, I-PCA, and standard PCA on a sample of high-contrast imaging data sets acquired in different observing conditions, after injecting a variety of synthetic disk models at different contrast levels.
Results. Mustard significantly improves the recovery of rotation-invariant signals in disk images, especially for data sets obtained in good observing conditions. However, the mustard model inadequately handles unstable ADI data sets and provides shallower detection limits than PCA-based approaches.
Conclusions. Mustard has the potential to deliver more robust disk images by introducing a prior to address the inherent ambiguity of ADI observations. However, the effectiveness of the prior is partly hindered by our limited knowledge of the morphological and temporal properties of the stellar speckle halo. In light of this limitation, we suggest that the algorithm could be improved by enforcing a data-driven prior based on a library of reference stars.
Follow-Up Adherence After Community Health Vision Screening Programs: A Review of the Literature
Authors: Zeng Rebecca , LaMattina Kara C. 
Published: October 2023

AbstractObjective Although the purpose of community eye screening programs is to reduce health care disparities, the effectiveness of these programs is limited by the follow-up adherence of their participants. The aim of this review is to investigate factors that may promote or hinder participants from attending follow-up ophthalmological exams after community eye screenings and identify interventions to increase follow-up rates.Methods For literature review, PubMed, Web of Science, Embase, Proquest/Global Health Library, and Google Scholar databases were searched to identify studies of community eye screenings published between January 2000 and May 2023. Data from these articles were analyzed to identify barriers and facilitators of follow-up adherence after community eye screenings in the United States and to examine strategies used to increase follow-up rates. Only published manuscripts were included. We excluded studies of school screenings and clinic-based screenings.Results A total of 28 articles were included. Follow-up rates ranged from 12.5 to 89%. Nineteen articles reviewed facilitators and barriers to follow-up. Eighteen articles were non interventional and seven (see Table 1 and 2, respectively) articles described interventions that were tested to improve follow-up rates after screening. Interventions included prescheduled appointments, transportation assistance, patient education, and patient navigators.Conclusion Several interventions are promising to increase follow-up adherence in community eye screenings, but more evidence is needed. Future research should focus on randomized trials of isolated interventions to improve follow-up adherence of disadvantaged populations, although this may be limited given ethical considerations and documented lack of follow-up after screening.
Discovering the long-term effects of COVID-19 on jobs–housing relocation
Authors: Zhao Pengjun , Gao Yukun 
Published: October 2023

AbstractJobs–housing relocation plays a crucial role in urban spatial restructuring and development. As the COVID-19 pandemic has dramatically altered the form of human mobility, it is likely to have affected individual relocation patterns. This study uses mobile phone signalling data from 2018 to 2022 in Beijing to examine and compare intra–urban jobs–housing relocation behaviours among commuters before and after the pandemic. This study captures the pandemic’s long–term effects via an event study design. Despite prevalent negative impressions of the pandemic, this study found that it may have unexpected positive influences on our cities. The pandemic decelerated suburbanisation in young middle–income home relocators but encouraged suburbanisation in relatively older high–income home relocators, which may have helped to preserve inner city vitality. The pandemic accelerated the decentralisation of spatial distribution of employment, which may have helped to further break the monocentric city structure. The pandemic also accelerated inverse jobs–housing separation and improved jobs-housing balance, which may have made the city greener. It is suggested that policy makers seize this opportunity to guide cities towards structural improvement and sustainability.
Elites, centers and “forces collectives”
Authors: Colistra Stefano , Ronza Rocco Walter 
Published: October 2023

Abstract
The concept of standard language has become highly controversial after the rise of the postmodernist paradigm.
This article traces the roots of the concept in the studies of a group of European linguists who inquired into the spread of
“common languages” and related it to the processes of modernization and the role of social elites and urban centers during the
1920s. It then reviews the central role it played in the studies on nationalism and nation-building after 1945 and discusses how
the focus on structural, macro-historical processes as determinants of the emergence of standard languages came to be abandoned in
classical and postmodernist approaches to language standardization. Finally, it suggests that Antonio Gramsci’s insights on the
“language question” in Italy should be read on the background of the early research on common languages and suggests that a
reconsideration of macro-historical approaches could contribute to the understanding of the spread of Global English.
Long-lag repetition priming in natural text reading
Authors: Coskun Melda , Kuperman Victor , Rueckl Jay 
Published: October 2023

Abstract
Most of the empirical evidence that lays the ground for research on recognition of printed morphologically complex
words comes from experimental paradigms employing morphological priming, e.g., exposure to morphologically related forms.
Furthermore, most of these paradigms rely on context-less presentation of isolated words. We examined whether well-established
morphological priming effects (i.e., faster recognition of a word preceded by a morphologically related word) are observable under
more natural conditions of fluent text reading. Using the GECO database of eye-movements recorded during the reading of a novel,
we examined the long-lag morphological and identity priming in one’s first language (L1, English and Dutch) or second language
(L2, English). While the effects of identity priming were ubiquitous, no evidence of morphological priming was observed in the L1
or L2 eye-movement record. We discuss implications of these findings for ecological validity and generalizability of select
current theories of morphological processing.
Unpolarized QED parton distribution functions in NLO
Authors: Arbuzov A B , Voznaya U E 
Published: October 2023

Abstract
Perturbative solutions for unpolarized QED parton distribution and fragmentation functions are presented explicitly in the next-to-leading logarithmic approximation. The scheme of iterative solution of QED evolution equations is described in detail. Terms up to


(

α

3

L

2

)

are calculated analytically, where

L
=
ln
(

μ

F

2

/

m

e

2

)

is the large logarithm which depends on the factorization energy scale μ

F
≫ m

e
. The results are process independent and relevant for future high-precision experiments.
Fiber denseness of intermediate β-shifts of finite type
Authors: Sun Yun , Li Bing , Ding Yiming 
Published: October 2023

Abstract
We focus on

T

β
,
α

(
x
)
=
β
x
+
α

(

m
o
d

1),

x
∈
[
0
,
1
]

and

(
β
,
α
)
∈
Δ
:=
{
(
β
,
α
)
∈

R

2

:
β
∈
(
1
,
2
)

and

0
<
α
<
2
−
β
}

. The

T

β
,
α

±

-expansions

τ

β
,
α

±

(
x
)

of critical point

c

β
,
α

=

1
−
α

β

are called kneading invariants, denoted as

(

k

+

,

k

−

)

. Let

Δ
(

k

+

)
:=
{
(
β
,
α
)
∈
Δ
:

τ

β
,
α

+

(

c

β
,
α

)
=

k

+

}

with

k

+

being periodic, we state that

Δ
(

k

+

)

is a smooth curve which can be regarded as a fiber. By combinatorial method, we extend the results of Parry (1960 Acta Math. Acad. Sci. Hung.
11 401–16) and show that, the set of

(
β
,
α
)

with its

Ω

β
,
α

being a SFT is dense in

Δ
(

k

+

)

. Similarly for the fiber

Δ
(

k

−

)

. When considering another fiber

Δ
(
β
)
:=
{
(
β
,
α
)
∈
Δ
:
β
∈
(
1
,
2
)

is

fixed

}

, we demonstrate that when β is not a multinacci number, there are only countably many distinct matching intervals on

Δ
(
β
)

. Using Markov approximation, we prove that the set of

(
β
,
α
)

with

Ω

β
,
α

being a SFT is dense in each matching interval. We also propose a classification scheme for the endpoints of these matching intervals.
On the dilemma between percolation processes and fluctuating pairs as the origin of the enhanced conductivity above the superconducting transition in cuprates
Authors: Llovo I F , Mosqueira J , Vidal F 
Published: October 2023

Abstract
The confrontation between percolation processes and superconducting fluctuations to account for the observed enhanced in-plane electrical conductivity above but near T

c
in cuprates is revisited. This dilemma is currently an open and debated question, whose solution would contribute to the phenomenological understanding of the emergence of superconductivity in these compounds. The cuprates studied here, La1.85Sr0.15CuO4, Bi2Sr2CaCu2O

8
+
δ

, and Tl2Ba2Ca2Cu3O10, have a different number of superconducting CuO2 (ab)-layers per unit-cell length and different Josephson coupling between them, and are optimally-doped to minimize T

c
-inhomogeneities. The excellent chemical and structural quality of these optimally-doped samples also contribute to minimize the effect of extrinsic

T

c

-inhomogeneities, a crucial aspect when analyzing the possible presence of intrinsic percolative processes. Our analyses also cover the so-called high reduced-temperature region, up to the resistivity rounding onset ɛ
onset. By using the simplest form of the effective-medium theory, we show that possible emergent percolation processes alone cannot account for the measured enhanced conductivity. In contrast, these measurements can be quantitatively explained using the Gaussian–Ginzburg–Landau (GGL) approach for the effect of superconducting fluctuations in layered superconductors, extended to ɛ
onset by including a total energy cutoff, which takes into account the limits imposed by the Heisenberg uncertainty principle to the shrinkage of the superconducting wavefunction. Our present analysis confirms the adequacy of this cutoff, which was introduced heuristically, and that the effective periodicity length is controlled by the relative Josephson coupling between superconducting layers, two long standing debated aspects of the GGL approaches for multilayered superconductors. These conclusions are reinforced by analyzing, as an example, one of the recent works that allegedly discards the superconducting fluctuations scenario while supporting a percolative scenario for the enhanced conductivity above T

c
in cuprates.
Prediction of tribological performance of Cu-Gr-TiC composites based on response surface methodology and worn surface analysis
Authors: Ankit  , Kumar Vineet , Yadav Amit Kumar , Gautam Gaurav , Singh Kamalesh Kumar , Mohan Sunil 
Published: October 2023

Abstract
In the current study, the prediction of tribological performance of Cu-Gr-TiC composites and its correlation with surface topography has been studied. For this purpose, the Cu-Gr composites reinforced with TiC ceramic particles were prepared via the powder metallurgy route. The prepared composites microstructure, mechanical characteristics, and dry sliding wear behaviour were assessed. A pin on disc setup was taken for tribological testing where sliding velocity is 1.5 m s−1. Wear behaviour of composites was examined using a central composite design (CCD) with three levels. The wear behavior optimization was accomplished through the utilization of response surface methodology (RSM). The input parameters in RSM consisted of sliding distance, varying load, and weight percentage (wt%) of reinforcements, while the wear rate and coefficient of friction served as the two responses. An analysis of variance (ANOVA) using RSM was conducted to identify the significant parameters influencing the wear rate and coefficient of friction. A quadratic model was suggested based on best fit and a regression equation was established for predicting the tribological properties at any given input parameter. Comparative of experimental and predicted values show close tolerance. It was observed that RSM is significant tool for predicting and optimizing the tribological properties. The composite having 3.08 wt% of TiC particles was optimized for minimum wear rate & COF at 20 N load and 2000 m sliding distance.
Pressure induced electronic and optical responses of vacancy-ordered double perovskites Cs2BX6 (B = Zr, Pd, Sn; X = Cl, Br, I)
Authors: Hua Howard (Jiaqi) , Luo Xuan 
Published: October 2023

Abstract
Due to the toxicity and instability of lead-containing perovskites, high-performance lead-free perovskite attracts considerable attention. Lead-free vacancy-ordered double perovskites (VODP) emerge as environmentally friendly and efficient solutions as lead-containing solar cell substitutes. In this study, electronic properties of vacancy-ordered double perovskites Cs2BX6 (B = Zr, Pd, Sn; X = Cl, Br, I) under high pressure are investigated using first-principles methods. Semiconductors with bandgaps between 1.1 to 1.6 eV are considered for application. Our results show Cs2PdCl6 giving 1.60 and 1.32 eV bandgaps at 5 and 10 GPa, Cs2PdBr6 yielding 1.22 eV at ambient pressure, Cs2SnBr6 having 1.31 and 1.03 eV bandgap at 5 and 10 GPa, and Cs2ZrI6 showing 1.52 and 1.28 eV bandgap at 15 and 20 GPa. Furthermore, we considered the absorption coefficient and spectrum to ensure the materials’ optical performance. Cs2PdCl6, Cs2PdBr6, and Cs2ZrI6 display competent absorbance in the visible light range and proved these vacancy-ordered double perovskites as promising lead-free solar cell materials.
Maximizing the solar output power using hybrid (CdS/ZnSe) buffer for CIGS thin film solar cell
Authors: Shovan Saumik Dey , Ringky Samia Akhter , Islam Afia Mubassira , Islam Saiful , Rashid Mohammad Junaebur 
Published: October 2023

Abstract
In this work, a hybrid buffer layer (CdS & ZnSe) is placed between the absorber and the window layer in a CIGS (Copper Indium Gallium Selenide) solar cell replacing the commonly used single-layer CdS. The buffer layer plays a crucial role in interface electricity to enhance the performance of the solar cell. Although, CdS is used as a buffer layer in CIGS solar cells, the toxic nature and parasitic absorption due to the narrowband gap (2.4 eV) become issues during its application in devices. To reduce Cd concentration and ameliorate the bandgap issue, the hybrid buffer layer (CdS & ZnSe) is a perfect supplant. In this study, numerical simulation is performed on CIGS-based solar cells comprised of a hybrid buffer layer to enhance the performance by optimizing the physical parameters (thickness, carrier concentration, and defect density) of both absorber and buffer layer using SCAPS-1D software. In the process of optimizing physical parameters, the effect of the mentioned parameters is observed on the solar cell performance. Later, the impact of working temperature is shown in the solar cell performance. Finally, with all those optimized parameters, a comparison has been done between the reference and the proposed structure. The comparison asserts that the proposed structure with a conversion efficiency of 24.55% is outdistancing the reference structure as well as some relative structures from the recent study. The simulation results in this study can be a didactic one in the fabrication of high-efficiency CIGS solar cells
Active anisotropic polarization conversion meta-surface for 6G communication bandgap in the reflection mode
Authors: Jalal Abdul , Qasim Muhammad , Qureshi Ubaid Ur Rahman , Hu Bin 
Published: October 2023

Abstract
This paper investigates a single-layered active anisotropic meta-surface design capable of achieving high polarization conversion efficiency in the 6 G communication band gap. Additionally, the designed structure can convert the linear polarization of the incoming wave fronts to its cross-polarization and linear polarization to circular polarization in the reflection mode. The polarization conversion characteristic is achieved due to the strong anisotropic behavior of the meta-surface. Such a simple design can achieve a 90% to 100% cross-polarization conversion efficiency over a frequency region of [0.28–0.36] THz. The linear to circular polarization conversion is performed near 0.26 THz and 0.40 THz. Between these two frequencies, band linear to cross-polarization conversion is more prominent. The proposed design can be tuned from a half-wave plate (HWP) or linear polarization converter to a quarter-wave plate (QWP) or circular polarization converter using the chemical potential of graphene. The optical response of the meta-surface behaves differently from different incident angles. The proposed polarization converter can contribute to the development of active polarization device.
Bandgap tuning, mechanical and thermoelectric properties of Cs2CuScX6 (X = Cl, Br, I) halide ion substitution for optoelectronic devices using density functional theory
Authors: Maqsood Saba , Muhammad Nawaz , Murtaza G , Javed M Aamir , Mahmood Asif , Mumtaz Sohail 
Published: October 2023

Abstract
As a result of their exceptional optoelectronic properties, the growing need for renewable and sustainable energy has heightened interest in perovskites. Using DFT, mechanical, electronic, optical, and thermoelectric properties of double perovskites (DPs) Cs2CuScX6 (X = Cl, Br, I) were analyzed to gain a comprehensive understanding of these materials. To ensure structural and thermal stability, permissible values for the tolerance factor (tG) and energy of formation (ΔHf) have been determined. The bandgap values of Cl, Br, and I-based compositions are recorded as 1.9 eV, 1.80 eV, and 1.70 eV, respectively. According to their bandgap, Cs2CuScBr6 and Cs2CuScI6 DPs determine the suitability of the materials for use in ideal photovoltaic devices. Further, optical properties are investigated in the energy range 0–10 eV, indicating visible and ultraviolet absorption. The investigated compound Cs2CuScI6 exhibited the highest visible spectrum absorption, making it an ideal candidate for solar cell applications. Moreover, the BoltzTrap code have been used for thermoelectric behaviour for temperature shows that all double perovskites have high Seebeck coefficients and low thermal conductivities.