bluuebunny/crossref_metadata_2025_split huggingface dataset:
Lattice dynamics and self-trapped excitons in the Cs2SnBr6 double perovskites
Authors: Hoang Manh Ha , Le Duy Manh , Le Anh Thi , Nguyen Quoc Khanh , Do T Anh Thu , Ho Truong Giang , Man Minh Tan 
Published: April 2024

Abstract
Our study delved into the detailed investigation of Cs2SnBr6 double perovskites, focusing on their electrical properties, lattice dynamics, and stability. The direct bandgap for Cs2SnBr6 was estimated to be at 2.93 eV. One external translational mode of the Cs+ lattice with T
2g symmetry and three internal modes of the octahedral with A
1g, E
g, and T
2g symmetries are defined by calculated lattice dynamics, experimental micro-Raman scattering. We show a correlation with first-principles calculations, validating using a band-structured electronic approach to understanding the behavior of charge carriers, and electron–phonon interactions in Cs2SnBr6. We propose that electron-vibration interactions result in self-trapped excitons (STEs) displaying significant Stokes shifts (0.508 eV) and broad-spectrum emission. Understanding the behavior of STEs is fundamental for their optoelectronic applications.
On the errors and their mitigation in planar laser induced fluorescence
Authors: Cholemari Murali R , Vishnubhatla Sri Hari , Krishnan Adhitya 
Published: April 2024

Abstract
In planar laser induced fluorescence (PLIF), scalar concentration fields are obtained from fluorescence images of the flow where the scalar is ‘tagged’ with a suitable fluorescent dye and illuminated with a laser sheet. While the fluorescence occurs, the intensity of the laser sheet is attenuated along its passage through the dye field. This paper discusses the effect of correcting for the attenuation of the laser by the dye while obtaining the scalar concentration field from the fluorescent images of the flow. If the attenuation correction cannot be done, the paper discusses three possible calibration scenarios to minimise the error. It is shown that the error in ignoring the attenuation due to turbulent concentration fluctuations cannot be corrected by any means. However, the remaining error can be exactly corrected if it were possible to calibrate with the mean concentration field. It is shown that a uniform concentration field, centred around the mean field, greatly reduces the error when compared to having no attenuation correction but still is significantly more when compared to the use of the average field. Relying on these results, we propose an iterative technique which ideally achieves the accuracy obtainable when calibrating with the mean concentration field, but which requires no reference cell. In addition, the paper explores the removal striations, of a common artefact during PLIF image acquisition with origins in the image optics. A technique to remove the same is proposed and its advantages discussed when compared to available techniques.
Self-assembled peptide nanotubes (SPNTs)/SnO2 nanocomposites for high-performance NO2 sensing at room temperature
Authors: Li Yang , Li Lili , Ying Zhihua , Wu Wei , Wang Gaofeng , Zhang Ranran 
Published: April 2024

Abstract
Nitrogen dioxide (NO2) is a major pollutant that poses significant risks to sustainable human life. As a result, a growing focus has been placed on the development of highly selective and sensitive gas sensors for NO2. Traditional cutting-edge non-organic NO2 gas detectors often necessitate stringent production conditions and potentially harmful materials, which are not environmentally friendly, and these shortcomings have limited their widespread practical use. To overcome these challenges, we synthesized self-assembled peptide nanotubes (SPNTs) through a molecular self-assembly process. The SPNTs were then combined with SnO2 in varying proportions to construct NO2 gas sensors. The design of this sensor ensured efficient electron transfer and leverage the extensive surface area of the SPNTs for enhanced gas adsorption and the effective dispersion of SnO2 nanoparticles. Notably, the performance of the sensor, including its sensitivity, response time, and recovery rate, along with a lower detection threshold, could be finely tuned by varying the SPNTs content. This approach illustrated the potential of bioinspired methodologies, using peptide self-assemblies, to develop integrated sensors for pollutant detection, providing a significant development in environmentally conscious sensor technology.
Influence of the magnetic configuration on the high-field side scrape-off layer at ASDEX Upgrade and the role of the secondary separatrix
Authors: Hachmeister D , Silva C , Santos J , Conway G D , Gil L , Silva A , Stroth U , Vicente J , Wolfrum E , McDermott R M , Dux R , Brida D , Fischer R , Kurzan B ,   the ASDEX Upgrade Team,   the EUROfusion MST1 Team
Published: April 2024

Abstract
In tokamaks, radial transport is ballooning, meaning it is enhanced at the low-field side (LFS). This work investigates the effect of the magnetic configuration on the high-field side (HFS) scrape-off layer. Our experiments involved L-mode and H-mode discharges at ASDEX Upgrade, in which we scanned the magnetic configuration from a lower to an upper single-null shape, thus varying the location of the secondary separatrix. We show that the secondary separatrix determines the width of the HFS scrape-off layer, meaning that the density is much lower in the region that is magnetically disconnected from the LFS scrape-off layer, outside the secondary separatrix. Furthermore, we observe that the large density often seen in the HFS divertor drastically decreases as the separation between the primary and secondary separatrices falls below a particular value. This value is different for L-mode and H-mode plasmas and closely matches the power decay length measured at the LFS midplane. We also show how the HFS scrape-off layer density is smaller in an upper single-null than in a lower single-null, when the ionic grad-B drift points down. This difference is likely caused by reversing the

E

×

B

drifts in the active divertor when switching the active X-point from the bottom to the top. We further observe that the neutral density in the lower divertor also correlates with the plasma shape and the high-density region in the HFS scrape-off layer. During the shape scans analyzed here, the HFS divertor remained partially detached throughout, with transitory reattachment modulated by ELM activity in H-mode. This work provides novel experimental data that can be leveraged to further the modeling capabilities and understanding of scrape-off layer physics in highly shaped plasmas.
Impact of increasing plasma-wall gap on plasma response to RMP fields in ITER
Authors: Bai X , Loarte A , Liu Y Q , Pinches S D , Koechl F , Li L , Dubrov M , Gribov Y 
Published: April 2024

Abstract
The impact of increasing plasma-wall gap on controlling edge-localized modes (ELMs) is numerically evaluated for the ITER 5 MA/2.65 T H-mode scenarios with full tungsten wall, based on the MARS-F computed plasma response to the applied n= 3–5 (n is the toroidal mode number) resonant magnetic perturbation (RMP) fields. Three new scenarios, referred to as standard, clearance and outergap, are considered assuming different plasma-wall gap sizes over a range on which vertically stability can be maintained by in-vessel coils in ITER. The latter are shown to have both direct and indirect effects on the plasma response and hence ELM control in ITER. The indirect and also primary influence occurs via change of the equilibrium edge safety factor q95
, which decreases with increasing the plasma-wall gap (at fixed plasma current and toroidal field), leading to a multi-peaking structure in the plasma response as measured by the plasma displacement near the X-point or the edge-localized resonant radial magnetic field perturbation. The direct, albeit secondary effect, is the reduction of local peak amplitudes with increasing the plasma-wall gap thus weakening the RMP field efficiency for ELM control with a given current in the control coils. A slight reduction of the plasma current, from 5 MA to 4.77, 4.92 and 4.65 MA for the standard, clearance and outergap scenarios, respectively, is found to be sufficient to access the q
95 window for the best ELM control with the n= 3 RMP. The n= 4 coil current configuration with the n= 5 sideband is also found favorable for ELM control in ITER, by producing RMP fields with mixed toroidal spectra compared to n = 3.
Three-electrode surface dielectric barrier discharge driven by repetitive pulses: streamer dynamic evolution and discharge mode transition
Authors: Peng Bangfa , Jiang Nan , Zhu Yifei , Li Jie , Wu Yan 
Published: April 2024

Abstract
The streamer dynamic evolution and discharge mode transition of a three-electrode surface dielectric barrier discharge (SDBD) driven by repetitive pulses are studied experimentally and numerically for better plasma-mode control and optimized application. Spatial-temporal plasma morphologic features together with electro-optical behavior are utilized to analyze the streamer dynamic evolution and streamer-to-spark transition. To gain a deep insight into the physical mechanism of the discharge mode transition in repetitive pulses, a 2D fluid model combined with a 0D kinetic model is built and studied. A good agreement between the experimental measurements and numerical simulation in the propagation dynamics and voltage–current characteristics is achieved. The results show that the surface-streamer discharge in the form of primary and transitional streamers can transform into a surface-spark discharge characterized by the primary streamer, transitional streamer and spark phase in repetitive pulses under the high applied electric field. A high gas temperature will result in a large reduced electric field after the transitional streamer, which exceeds the ionization threshold and thus promotes the discharge mode transition. A high number of electrons can be released from the negative charges by oxygen atoms during the inter-pulse period, which is favorable for the re-ignition and ionization process of the subsequent pulse discharge.
Bilateral fault-tolerant qudit teleportation in multi-hop quantum networks
Authors: Li Zongyi , Wei Yuzhen , Xue Shibei , Jiang Min , Li Yongcheng 
Published: April 2024

Abstract
In this paper, we present one general fault-tolerant multi-hop teleportation scheme for arbitrary unknown qudit system, exploring a strategy for distilling high-dimensional EPR pairs within the operational errors channel, where the introduced auxiliary pairs don’t have to be in high-fidelity. These errors can be detectable and traceable in quantum networks, promising that the accumulation of the operational errors can be rectified by the final receiver during the teleportation, avoiding the error correction implemented by the intermediate nodes. Moreover, we extend the strategy to the non-maximally entangled EPR channels. In the end, we discuss the potential strategy to improve our scheme including eliminating the encoding step for the error correction codes. Even through the operational errors may occur at the repeater nodes, the performance analysis demonstrates that the scheme significantly preserves the valuable entangled resources and reduces the operational complexity, illustrating the robustness to against the operational errors in repeater nodes.
Holographic encryption algorithm based on the new integrated chaotic system and chaotic mask
Authors: Liang Zhenhui , Chen Li , Chen Kai , Liang Zheng , Zhu Jiawei , Wen Kunhua , Hu Yihua 
Published: April 2024

Abstract
Image encryption algorithms based on chaos theory have rapidly developed in recent years, with many achieving encryption by confusion-diffusion structures. However, the security performance of these algorithms needs to be improved. This paper proposes a holographic encryption algorithm based on the new integrated chaotic system and chaotic mask. The improved Gerchberg-Saxton algorithm transforms plaintext images into pure-phase holograms. The chaotic masks generated by the new integrated chaotic system decompose holograms into sub-images. The sub-images are pixel-wise heterogeneous operations and are finally merged into the complete encrypted image. Compared with one-dimensional chaotic mapping, the generation of NICS is related to kinoform, which enhances the system’s key sensitivity. The chaotic mask chunking method can generate random chunk locations and sizes, effectively preventing attacks against specific chunking rules. The performance analysis shows that the algorithm has a higher key space and security to resist stronger robustness attacks.
WENO schemes using optimized third order fuzzy weight limiter functions
Authors: Mishra Prabhat , Dubey Ritesh Kumar 
Published: April 2024

Abstract
This work presents an improved version of non-linear weight limiters to obtain third order non-oscillatory WENO scheme. The construction of this modified weight limiter is based on fuzzy inference system, which is a knowledge based rule system. The linear combination of overlapped basis functions is used to achieve the optimized weight limiters by exploring the linguistics hedges operator on the basis functions. The WENO scheme using optimized weight limiter achieves third order of accuracy and gives higher resolution to discontinuities compared to other established third order WENO schemes.
Mathematical analysis of the structure of one-heptagonal carbon nanocone in terms of its basis and dimension
Authors: Al-Qudah Yousef , Jaradat Ali , Sharma Sunny Kumar , Bhat Vijay Kumar 
Published: April 2024

Abstract
For an undirected connected graph G = G(V, E) with vertex set V(G) and edge set E(G), a subset R of V is said to be a resolving in G, if each pair of vertices (say a and b; a ≠ b) in G satisfy the relation d(a, k) ≠ d(b, k), for at least one member k in R. The minimum set R with this resolving property is said to be a metric basis for G, and the cardinality of such set R, is referred to as the metric dimension of G, denoted by dim

v
(G). In this manuscript, we consider a complex molecular graph of one-heptagonal carbon nanocone (represented by HCN

s
) and investigate its metric basis as well as metric dimension. We prove that just three specifically chosen vertices are enough to resolve the molecular graph of HCN

s
. Moreover, several theoretical as well as applicative properties including comparison have also been incorporated.
Observational bounds on extended minimal theories of massive gravity: new limits on the graviton mass
Authors: Felice Antonio De , Kumar Suresh , Mukohyama Shinji , Nunes Rafael C. 
Published: April 2024

Abstract
In this work, we derive for the first time observational constraints on the extended Minimal Theory of Massive Gravity (eMTMG) framework in light of Planck-CMB data, geometrical measurements from Baryon Acoustic Oscillation (BAO), Type Ia supernovae from the recent Pantheon+ samples, and also using the auto and cross-correlations cosmic shear measurements from KIDS-1000 survey. Given the great freedom of dynamics choice for the theory, we consider an observationally motivated subclass in which the background evolution of the Universe goes through a transition from a (positive or negative) value of the effective cosmological constant to another value. From the statistical point of view, we did not find evidence of such a transition, i.e. deviation from the standard ΛCDM behavior, and from the joint analysis using Planck + BAO + Pantheon+ data, we constrain the graviton mass to < 6.6 × 10-34 eV at 95% CL. We use KIDS-1000 survey data to constrain the evolution of the scalar perturbations of the model and its limits for the growth of structure predicted by the eMTMG scenario. In this case, we find small evidence at 95% CL for a non-zero graviton mass. We interpret and discuss these results in light of the current tension on the S
8 parameter. We conclude that, within the subclass considered, the current data are only able to impose upper bounds on the eMTMG dynamics. Given its potentialities beyond the subclass, eMTMG can be classified as a good candidate for modified gravity, serving as a framework in which observational data can effectively constrain (or confirm) the graviton mass and deviations from the standard ΛCDM behavior.
Backreaction of axion-SU(2) dynamics during inflation
Authors: Iarygina Oksana , Sfakianakis Evangelos I. , Sharma Ramkishor , Brandenburg Axel 
Published: April 2024

Abstract
We consider the effects of backreaction on axion-SU(2) dynamics during inflation. We use
the linear evolution equations for the gauge field modes and compute their backreaction on the
background quantities numerically using the Hartree approximation. We show that the spectator
chromo-natural inflation attractor is unstable when back-reaction becomes important. Working
within the constraints of the linear mode equations, we find a new dynamical attractor solution
for the axion field and the vacuum expectation value of the gauge field, where the latter has an
opposite sign with respect to the chromo-natural inflation solution. Our findings are of
particular interest to the phenomenology of axion-SU(2) inflation, as they demonstrate the
instability of the usual trajectory due to large backreaction effects. The viable parameter space
of the model becomes significantly altered, provided future non-Abelian lattice simulations
confirm the existence of the new dynamical attractor. In addition, the backreaction effects lead
to characteristic oscillatory features in the primordial gravitational wave background that are
potentially detectable with upcoming gravitational wave detectors.
Optimal map-making with singularities
Authors: Zhang Zirui , Wu Yiwen , Liu Yang , Li Siyu , Li Hong , Liu Hao 
Published: April 2024

Abstract
In this work, we investigate the optimal map-making technique for the
linear system d = Ax + n while carefully taking into
account singularities that may come from either the covariance matrix
C = ⟨nn

t
⟩ or the main matrix A. We first
describe the general optimal solution, which is quite complex, and then
use the modified pseudo inverse to create a near-optimal solution,
which is simple, robust, and can significantly alleviate the unwanted
noise amplification during map-making. The effectiveness of the nearly
optimal solution is then compared to that of the naive co-adding
solution and the standard pseudo inverse solution, showing noticeable
improvements. Interestingly, all one needs to get the near-optimal
solution with singularity is just a tiny change to the classical
solution, which is designed for the case without singularity.
Quantum nonlocality without entanglement in a 2n-partite system
Authors: Dong Meng-Ya , Zhang Su-Juan , Bai Chen-Ming , Liu Lu 
Published: April 2024

Abstract
In recent years, researchers focused their attention on the construction of nonlocal product states in multipartite quantum systems. This paper proposes a novel partitioning method for multipartite quantum systems, aiming to improve the operation efficiency. Firstly, we divide 2n subsystems into n parts two by two and implement orthogonality-preserving local measurement on the partitioned composite systems. Subsequently, based on the partitioning mode, nonlocal orthogonal product states in

(

C

3

)

⊗
6

and

(

C

4

)

⊗
6

are given. Finally, we construct nonlocal orthogonal product states in

(

C

d

)

⊗
2
n

and discuss the cases where d is odd and even. Our results demonstrate the phenomenon of nonlocality without entanglement in a 2n-partite system.
Analysis and design of fast flow liquid Li divertor for fusion nuclear science facility (FNSF) using coupled plasma boundary and LM MHD/heat transfer codes
*
Authors: Islam M.S. , Lore J.D. , Smolentsev S. , Kessel C.E. , Maingi R. 
Published: April 2024

Abstract
The SOLPS-ITER code is utilized to analyze the boundary plasma associated with a fast-flow lithium (Li) divertor configuration in the fusion nuclear science facility (FNSF) tokamak and identify operational regimes with acceptable divertor and core conditions. Plasma transport from the SOLPS-ITER code has been coupled with a liquid metal (LM) MHD/heat transfer code to model a Li open-surface divertor design and assess its impact on the scrape-off-layer (SOL) and core plasma performance. Simulations with only Neon (Ne) impurity seeding have been conducted to evaluate its impact on meeting FNSF design demands for the divertor and upstream plasma parameters. Simulation results indicate that Ne seeding significantly mitigates divertor heat flux but potentially reduces both upstream electron and main ion density due to fuel dilution. The combined application of Ne seeding and deuterium (D2) puffing is required to satisfy the FNSF design requirements on upstream density (

n

e
,
sep

OMP

∼1× 1020 m−3) and divertor energy flux (

q

⊥
,
max

Odiv

<

10 MW m−2). D2 puffing plays a role in counteracting upstream density drops and augmenting energy and momentum losses through atomic and molecular processes.
The inlet Li flow velocity is systematically varied across a wide range to identify acceptable flows and corresponding LM surface temperatures. This comprehensive analysis identifies the acceptable Li flow parameters, LM surface temperature, and emitted Li fluxes necessary to meet the major design constraints. The emitted Li fluxes exhibit minimal impact on the main plasma at surface temperatures up to approximately ∼525 ∘C, corresponding emitted Li fluxes of up to φ
Li ∼2

×

10

23

atoms s−1. Uncertainties in the Li emission processes from the surface are also investigated, primarily influencing Li loss in the lower surface temperature range (

<

525

∘

C), with simulation results indicating a minor impact on the divertor and upstream plasma. Conversely, evaporation predominantly drives the Li loss processes at higher surface temperature ranges (

>

525

∘

C), contaminating both the divertor and upstream plasma.
Aerodynamic design optimization of locally built FSR Isuzu bus through numerical simulation
Authors: Kahsay Yirga Kiros , Zeleke Dinku Seyoum 
Published: April 2024

Abstract
Reducing the fuel consumption of commercial vehicles—especially those used for public transportation—has become increasingly important due to advancements in the automotive industry. On the other hand, the main disadvantages of buses and other commercial vehicles are their fuel consumption, exhaust pollutants, and crosswind stability. Most buses built in Ethiopia have aerodynamic rectangular shapes and strong drag resistance forces, which lead to higher fuel consumption. One of the most accessible buses in Ethiopia is the FSR Isuzu Bus; its external body is locally constructed and has a poor aerodynamic shape. The primary goal of this study is to reduce aerodynamic drag force by improving the outer body shape of the current FSR Isuzu Bus. It also aims to examine the impact of roughness (strip) on the overall aerodynamic characteristics of the bus when it encounters crosswinds, thereby reducing fuel consumption, roll moment, and side force. For computational fluid dynamics (CFD) analysis, ANSYS Fluent is used, and Solidwork is used to model the bus body. A comparison is made between the current CFD analysis of the bus body and the modified design at varying speeds. Three separate models are used in the analysis. At an average speed of 100 kmph, 29.58% (4 to 5 liters) of fuel can be saved, and the drag force is reduced by roughly 49.7% when comparing the new concept to the current bus. By utilizing a strip on the bus’s roof, the side force coefficient and the roll moment coefficient are subsequently reduced from model two to model three by 8.76% and 9.01%, respectively. The study’s conclusions indicate that the external body shape changes have reduced drag; and, adding roof strips has decreased drag to acceptable level and enhanced crosswind stability.