bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effective Lifshitz black holes, hydrodynamics, and transport coefficients in fluid/gravity correspondence
Authors: Moreira D C , da Rocha R 
Published: November 2024

Abstract
Effective Lifshitz black holes with arbitrary dynamical exponent are addressed in the fluid/gravity membrane paradigm. The transport and the response coefficients in the dual Lifshitz field theory are calculated and analyzed, including the charge diffusion constant and the shear mode damping constant, along with the shear-viscosity-to-entropy density ratio. The Kubo formula is employed to obtain the electrical DC conductivity for the gauge sector corresponding to impurity through the holographic linear response of gauge vector fluctuations in the Lifshitz black brane geometry.
Existence and absence of Killing horizons in static solutions with symmetries
Authors: Maeda Hideki , Martínez Cristián 
Published: November 2024

Abstract
Without specifying a matter field nor imposing energy conditions, we study Killing horizons in

n
(
⩾
3
)

-dimensional static solutions in general relativity with an

(
n
−
2
)

-dimensional Einstein base manifold. Assuming linear relations

p

r

≃

χ

r

ρ

and

p
2

≃

χ

t

ρ

near a Killing horizon between the energy density ρ, radial pressure

p

r

, and tangential pressure p
2 of the matter field, we prove that any non-vacuum solution satisfying

χ

r

<
−
1

/

3

(

χ

r

≠
−
1

) or

χ

r

>
0

does not admit a horizon as it becomes a curvature singularity. For

χ

r

=
−
1

and

χ

r

∈
[
−
1

/

3
,
0
)

, non-vacuum solutions admit Killing horizons, on which there exists a matter field only for

χ

r

=
−
1

and

−
1

/

3

, which are of the Hawking–Ellis type I and type II, respectively. Differentiability of the metric on the horizon depends on the value of

χ

r

, and non-analytic extensions beyond the horizon are allowed for

χ

r

∈
[
−
1

/

3
,
0
)

. In particular, solutions can be attached to the Schwarzschild–Tangherlini-type vacuum solution at the Killing horizon in at least a

C

1
,
1

regular manner without a lightlike thin shell. We generalize some of those results in Lovelock gravity with a maximally symmetric base manifold.
Facilitating martensitic reorientation via porous structure of Ti-doped Ni–Mn–Ga shape memory alloy
Authors: Wang Kunyu , Wang Zhiqiang , Li Yunlong , Zhu Jie , Ding Zhiyi 
Published: November 2024

Abstract
Porous Ni–Mn–Ga shape memory alloy with the pore size of 20–30 μm was fabricated by the powder metallurgy with the pore-forming agent of NaCl. The prepared alloy has a uniform pore distribution and a complete sintering neck, which reduces the number of grain boundaries. Pores constrain the transmission of stress, leading to stress concentration, which decreases the critical stress of martensitic twin variants reorientation (<10 MPa). Meanwhile, the strength of porous alloys can be tuned by the alloying of Ti. In addition, the porous Ni–Mn–Ga alloy obtained a lower critical stress for martensitic twin boundary motion after cyclic compression, which makes it suitable for devices that require energy absorption under low stress. The microstructure and mechanical properties of Ni–Mn–Ga porous alloy were analyzed, and the effects of pores on the Ni–Mn–Ga alloy were also discussed.
Monolayer M2X2O as potential 2D altermagnets and half-metals: a first principles study
Authors: Zou Kaixin , Yang Yuxin , Xin Baojuan , Wu Wentao , Cheng Yahui , Dong Hong , Liu Hui , Luo Feng , Lu Feng , Wang Wei-Hua 
Published: November 2024

Abstract
Realizing novel two-dimensional (2D) magnetic states would accelerate the development of advanced spintronic devices and the understandings of 2D magnetic physics. In this paper, we have examined the magnetic and electronic properties of 20 dynamically stable and exfoliable M2X2O (M = Ti–Ni; X = S–Te; excluding Co2Te2O). It has been unveiled that [X4O2]-D
2h
and [M4]-D
4h
crystal fields govern the M-3d orbital splittings in M2X2O. The splittings further lead to the antiferromagnetic (AFM) orderings in Ti2S2O/Fe2S2O/Fe2Se2O/M2X2O (M = V, Cr, Mn and Ni; X = S–Se) as well as the ferromagnetic orderings in Ti2Se2O/Ti2Te2O/Fe2Te2O/Co2S2O/Co2Se2O through kinetic and superexchange mechanisms. Notably, all the AFM M2X2O are 2D altermagnets, and Ti2Se2O/Ti2Te2O/Co2S2O/Co2Se2O are 2D half-metals. In particular, the anisotropic d-d/p hoppings lead to the tunable altermagnetic splitting in Ti2S2O/Cr2Te2O, while the parity of V-3dyz
orbital contributes to the symmetry-protected altermagnetic splitting within V2X2O. These altermagnetic and half-metallic monolayer M2X2O provide promising candidates applied in low-dimensional spintronic devices. In addition, the potential 2D altermagnetic Weyl semimetal of Fe2S2O/Fe2Se2O, nodal-loop half-metal of Ti2Se2O and half-semi metal of Ti2Te2O facilitate to uncover novel low-dimensional topological physics. These theoretical results would expand the platform in particular for 2D altermagnets and nontrivial systems.
Controllable p-type doping and improved conductance of few-layer WSe2 via Lewis acid
Authors: Li Mengge , Ou Tianjian , Xiao Cong , Qiu Zhanjie , Wu Xiaoxiang , Guo Wenxuan , Zheng Yuan , Yang Hancheng , Wang Yewu 
Published: November 2024

Abstract
Manipulation of the electronic properties of layered transition-metal dichalcogenides (TMDs) is of fundamental significance for a wide range of electronic and optoelectronic applications. Surface charge transfer doping is considered to be a powerful technique to regulate the carrier density of TMDs. Herein, the controllable p-type surface modification of few-layer WSe2 by FeCl3 Lewis acid with different doping concentrations have been achieved. Effective hole doping of WSe2 has been demonstrated using Raman spectra and XPS. Transport properties indicated the p-type FeCl3 surface functionalization significantly increased the hole concentration with 1.2 × 1013 cm−2, resulting in 6 orders of magnitude improvement for the conductance of FeCl3-modified WSe2 compared with pristine WSe2. This work provides a promising approach and facilitate the further advancement of TMDs in electronic and optoelectronic applications.
Investigations on thermal and mechanical characteristics of PDMS embedded FBG sensors for wearable sensing applications
Authors: Chalackal Archana Thrikkaikuth , Kanakambaran Srijith 
Published: November 2024

Abstract
Fiber Bragg Grating (FBG) sensors embedded in polydimethylsiloxane (PDMS) are suitable for real-time monitoring of parameters like strain, temperature, force etc. This work investigates the thermal and mechanical properties of PDMS samples at mixing ratios of 6:1, 10:1, and 15:1 with embedded FBGs. The 10:1 sample showed the highest temperature sensitivity of 22.51 ± 0.54 pm ∘C−1. Young’s modulus values from mechanical characterization ranged from 2.20–8.16 MPa, 2.56–7.68 MPa, and 0.44–5.02 MPa for mixing ratios 6:1, 10:1, and 15:1, respectively. The highest force and strain sensitivities were 1.356 nm N−1 and 0.153 pm/µε for the 10:1 ratio, making it preferable for wearable sensors.
Novel family of probability generating distributions: Properties and data analysis
Authors: Ahmad Aijaz , Tashkandy Yusra , Rather Aafaq A , Bakr M E , Hussam Eslam , Gemeay Ahmed M 
Published: November 2024

Abstract
Current probability distributions often fall short when modeling lifespan data with non-monotonic hazard rate shapes, highlighting a gap in probability theory. To address this issue, this study introduces the novel family of probability-generating distributions (NP-G) as a solution to capture complex data patterns better. This research aims to develop and validate the NP-G distributions, which include a two-parameter continuous model based on the Weibull distribution. The study extensively explores the mathematical properties of the NP-G distributions, including series expansions of probability density functions, and evaluates various probabilistic measures such as moments, stress strength, mean deviations, entropy measures, and order statistics. Using the maximum likelihood method for parameter estimation and conducting a numerical simulation analysis, the study assesses the performance of the proposed extended exponentiated Weibull model. The findings demonstrate that this new model offers superior fit and accuracy compared to existing distributions when applied to two referenced datasets. This advancement is significant as it provides a more effective tool for analyzing lifespan data with non-monotonic hazard rates, enhancing both theoretical understanding and practical applications in fields such as reliability engineering and survival analysis.
Passively generated Q-switched pulses fiber laser in 2 μm wavelength using MXene Ti3C2Tx and Ti2CTx saturable absorber
Authors: Lip Zhan Hong , Cheng Xiau San , Chi Mingzhi , Sin Jin Tan , Abdul Latiff Anas , Harun Sulaiman Wadi 
Published: November 2024

Abstract
In this paper, Q-switched Thulium-doped fiber lasers (TDFLs) operating near the 2 μm region were demonstrated, utilizing a newly developed Thulium doped fiber as the gain medium and titanium carbide MXene as the saturable absorber (SA). The Thulium-doped fiber with a composition of SiO2-GeO2-Al2O3-HfO2-Y2O3-Bi2O3, was produced from a preform prepared using the modified chemical vapor deposition (MCVD) process. Two variations of titanium carbide MXene-based SA, Ti3C2Tx and Ti2CTx, were tested and compared, successfully generating Q-switched pulses. When Ti3C2Tx was used, the Q-switched pulse had a center wavelength of 1934.223 nm, a repetition rate of 55.39 kHz and a pulse width and 1.942 μs. For Ti2CTx, the generated Q-switched pulse has a center wavelength of 1932.229 nm, with a repetition rate of 77.28 kHz and a pulse width of 1.608 μs. The signal-to-noise ratio (SNR) values were 45.6 dB and 50.2 dB for Ti3C2Tx and Ti2CTx respectively. Based on the experimental results, both Ti3C2Tx and Ti2CTx show promise as SAs for generating Q-switched pulses in the 2 μm region within the TDFL cavity.
Decays Z → eaeb in a 3-3-1 model with neutral leptons
Authors: Hong T. T. , Hue L. T. , Phuong L. T. T. , Nha N. H. T. , Nguyen T. Phong 
Published: November 2024

Abstract
We investigate the 3-3-1 model with neutral leptons, a specific extension of the 3-3-1 models that includes heavy neutral leptons, which are sufficient to accommodate the neutrino oscillation data via the inverse seesaw mechanism. We will point out that this model can simultaneously explain the lepton flavor violating decays of the Z and Standard Model-like Higgs bosons into different charged leptons Z, h → e

a

e

b
, as well as the charged lepton decays e

b
→ e

a

γ, in agreement with the recent experimental data. In addition, the numerical results show strong correlations among the decay rates of the Z and h bosons predicted by this model. Specifically, some of these rates are nearly linearly dependent on each other. Consequently, the decay channels can be theoretically determined if one of them is detected in experiments.
Highly sensitive liquid level and temperature sensors based on all-fiber intermodal interferometers
Authors: Li Hongwei , Chen Qiang , Li Lida , Chen Hailiang , Li Shuguang , Ma Mingjian 
Published: November 2024

Abstract
Fiber optic-based precise measurements of liquid level and temperature are crucial for remote controlling in pharmaceutics, chemistry, and bromatology. Thus, it is essential to monitor liquid level and temperature simultaneously. In this paper, we propose all-fiber intermodal interferometers for highly sensitive liquid level and temperature measurements. We fabricated two different structures of single mode fiber-no core fiber-single mode fiber (SMF-NCF-SMF). One of them was used to measure the liquid level when the liquid soaked the NCF, and the other one was further coated with polydimethylsiloxane(PDMS) thermal-optic material and utilised to detect temperature. The measurement sensitivity of liquid level was 580 pm/mm within the range of 0–20 mm, while that of temperature was 1 nm/°C within the range of 28 °C–51 °C. A matrix was finally obtained by demodulating the measurements of liquid level and temperature. The proposed liquid level and temperature sensors, exhibiting the merits of high sensitivity, easy fabrication, and low cost, could be a candidate for precise and remote monitoring of liquid levels.
Study of isotropic stellar models via durgapal-lake solutions in rastall system
Authors: Waseem Arfa , Naeem Sunaiha 
Published: November 2024

Abstract
This manuscript is dealt with the influences of Rastall factor on the physical aspects of isotropic celestial models. In this scenario, both the ideal fluid distribution and static spherically symmetry are taken into consideration. In specifically, the Durgapal-Lake solutions are taken into consideration to analyze the different characteristics of several specific compact star models like Her X-1, Vela X-1, LMC X-4 and RXJ 1856-37. Due to its innovative combination of two methodologies, this solution is a significant advancement on Durgapal-Fuloria and Lake's previous ansatz in enormous crucial eras. Using observed estimates of radii and masses of certain specific star objects, the undefined parameters in Durgapal-Lake ansatz are derived by matching conditions. The consistency of the adopted solutions is examined through the visual interpretation of matter constituents, equation of state factor, energy conditions, mass function and stability criteria corresponding to distinct choices of Rastall factor. The radially symmetric graphs of matter variables as well as the mass function are also displayed. Moreover, We present the graphical analysis for vanishing Rastall factor. It is concluded that in the context of Rastall theory, the stars under examination exhibit stable compositions with Durgapal-Lake solution, while in the context of general relativity, they exhibit instability.
Single laser based novel wavelength shift keying scheme for ground to satellite bidirectional links
Authors: Faria  , Ghafoor Salman , Mirza Jawad , Aljohani Abdulah Jeza , Aziz Imran 
Published: November 2024

Abstract
Laser communication in space is gaining more recognition due to its ability to provide a much broader and unregulated data transmission capacity compared to traditional radio frequency systems, while also significantly decreasing the size, power requirements, and weight of the communication system. In this work, a novel technique for the generation of a wavelength shift keying (WSK) signal for the bidirectional transmission of 10 Gbps data between the ground station and low Earth orbit (LEO) satellite is presented. Our proposed scheme requires a single laser source to transmit WSK signal, that generally requires two wavelength sources to transmit the binary data bits. Furthermore, the scheme allows us to remodulate the optical signal received at the LEO satellite for downlink signal transmission. Therefore, the requirement of a laser source at the LEO satellite is eliminated, achieving the much desirable goals of low power consumption, weight and cost. The free space optical (FSO) channel is modelled using the gamma-gamma channel model. The performance of the proposed link is also compared with a conventional On-Off keying (OOK) based modulation scheme by using bit-error-rate (BER) as the performance metric.
A dynamic semi-quantum private comparison protocol for size relations
Authors: Ye Chong-Qiang , Chen Xiaoyu , Li Jian 
Published: November 2024

Abstract
Semi-quantum private comparison allows multiple ‘classical’ users who have restricted quantum capabilities to compare their private data with the assistance of a quantum third party. In this work, we propose a novel dynamic semi-quantum private comparison protocol using a circular transmission mode along with d-dimensional single-particle states. The protocol enables the comparison of data size relations among several ‘classical’ users, while the third party can only determine the relative sizes without accessing the users’ secret information. Security evaluations demonstrate that the designed protocol withstands typical external and internal attacks. Compared to previous works, this protocol offers several improvements: first, it supports dynamic addition or removal of users, enhancing applicability in practical scenarios; second, it eliminates the need for pre-shared keys, reducing quantum resource consumption; third, it avoids the use of high-dimensional multi-particle entangled states, thereby enhancing the feasibility of implementation. Therefore, the proposed protocol may have more practical potential compared to previous protocols.
Layout optimization and performance analysis of large array of imaging atmospheric Cherenkov telescopes*
Authors: Zhang 张 Zhipeng 志鹏 , Yang 杨 Ruizhi 睿智 , Zhang 张 Shoushan 寿山 , Xie 谢 Zhen 禛 , Liu 刘 Jiali 加丽 , Yin 尹 Liqiao 丽巧 , Wang 王 Yudong 玉东 , Ma 马 Lingling 玲玲 , Cao 曹 Zhen 臻 
Published: November 2024

Abstract
The large array of imaging atmospheric Cherenkov telescopes (LACT) is a planned array of 32 Cherenkov telescopes, each featuring 6-m diameter mirrors, to be constructed at the LHAASO site. This study focused on optimizing the array layout and analyzing the performance of LACT. Two observation modes were examined: large zenith angle observations for ultra-high energy events and small zenith angle observations for lower energy thresholds. For large zenith angles (60°), simulations indicate that an 8-telescope subarray can achieve an effective area of

with excellent angular resolution. For small zenith angles, we optimized the layout of 4-telescope cells and the full 32-telescope array. The energy threshold of the full array is approximately 200 GeV, which is particularly crucial for studying transient phenomena such as gamma-ray bursts (GRBs) and active galactic nuclei (AGNs). This study provides essential guidance for finalizing the LACT layout design and estimating performance under various observational conditions. It also highlights the potential of LACT for conducting deep observations of ultra-high energy
γ-ray sources, performing morphological studies of PeVatrons, and advancing time-domain
γ-ray astronomy.
Porous dielectric design for high-performance flexible shear sensors
Authors: Bu Yingxuan 
Published: November 2024

Abstract
Flexible sensors, renowned for their exceptional adaptability, are widely utilized in areas such as robotics and healthcare monitoring. Currently, understanding the relationship between the structure and performance of flexible shear sensors has become increasingly important. In this study, the structural characteristics of porous flexible shear sensors and their impact on performance were analyzed using Finite Element Method (FEM). The investigation focused on three factors: porosity, pore size, and the shape of elliptical pores. The findings suggest that augmenting the porosity substantially boosts the shear sensitivity of the sensor, whereas the pore size exerts a relatively minor influence on sensitivity. Furthermore, compared to circular ones, elliptical pores can further increase the shear sensitivity of the sensor, particularly when the ellipse’s major axis is oriented horizontally. These findings are of significant reference value for designing and optimizing high-performance flexible shear sensors.
Injection over-molding process of PEEK composites
Authors: Yang Yufan , Hu Nan , Wu Zijie , Hao Jie , Qiu Lili 
Published: November 2024

Abstract
This study utilizes experimental and microscopic characterization methods to investigate the prospects and feasibility of using the Injection Over-Molding (IOM) process to replace traditional adhesives in the manufacturing of complex ribbed panel structures with Polyether Ether Ketone (PEEK) composites. The results indicate that the IOM process can achieve the optimal bonding strength of adhesives while significantly reducing the processing cycle, demonstrating substantial potential. Additionally, enhancing the melt temperature and mold temperature can further improve interface bonding quality and increase bonding strength. Based on the experimental results, it is inferred that increasing the melt temperature can elevate the interface temperature while raising the mold temperature can slow down the interface cooling rate, suggesting mechanisms by which these parameters influence interface bonding quality.
A novel output window for dual-band gyrotron amplifier
Authors: Wang Xiaoyan , Fang Jinyong , Wu Jiangniu , Peng Kai 
Published: November 2024

Abstract
As a high-frequency, high-power, and high-bandwidth microwave source, the gyrotron amplifier has good application prospects in the aerospace field. The microwave window is of great significance for the high-frequency characteristics, power capacity, lifespan, and reliability of the gyrotron amplifier. This paper introduces a novel double-disk sapphire output window, which has excellent mechanical strength, high-temperature resistance, and high power capacity. The transmission coefficient S21 of TE01 mode is greater than −1 dB in 8.29 GHz∼9.73 GHz, and the S21 of TE02 mode is greater than −1 dB in 16.33 GHz −17.8 GHz, which can ensure wide bandwidth operation of high microwave transmission in X and Ku bands. It solves the problem of using one port to achieve microwave output in two bands for dual-band gyrotron amplifiers.
Design optimization of anti-spin parachute for fighter-class aircraft
Authors: Zhang Qi , Cheng Jiaao 
Published: November 2024

Abstract
In the absence of spin wind tunnel test and model free flight test support, the traditional empirical formulas had low accuracy and large dispersion, which made it difficult to effectively support the anti-spin parachute design of fighter planes. Based on the principle of spin motion, the empirical formula is modified from two aspects: aircraft aerodynamic layout and mass characteristics. At the same time, the relationship between the parachute area and the flight weight is summarized, which makes the estimated result closer to the actual value and more applicable. In addition, aiming at the problem of excessive load in the design of anti-spin parachutes, the causes of the problem are analyzed in detail. The design criterion of the anti-spin parachute is optimized. Under the premise of ensuring the recovery effect, the need to strengthen the aircraft body structure is effectively reduced. The results show that the engineering estimation methods and design criteria of the anti-spin parachute proposed in this paper are effective after simulation and actual application and can provide technical support for subsequent anti-spin parachute design of new fighter planes.