bluuebunny/crossref_metadata_2025_split huggingface dataset:
Role of thermal conduction in relativistic hot accretion flow around rotating black hole with shock
Authors: Singh Monu , Das Santabrata 
Published: February 2025

Abstract
We investigate the properties of low angular momentum, relativistic, viscous, advective accretion flows around rotating black holes that include shock waves in the presence of thermal conduction. We self-consistently solve the governing fluid equations to obtain the global transonic accretion solutions for a set of model parameters, namely energy (ℰ), angular momentum (λ), viscosity (α), conduction parameter (Φs) and cooling parameter (f
c). We observe that depending on the model parameters, accretion flow experiences centrifugally supported shock transition and the present study, for the first time, focuses on examining the shock properties, such as shock radius (r
s), compression ratio (R) and shock strength (Ψ) regulated by the dissipation parameters (Φs, f
c). We show that shock-induced global accretion solutions persist for wide range of model parameters and identify the boundary of the parameter space in energy-angular momentum plane that admits standing shocks for different dissipation parameters (Φs, f
c). Finally, we compute the critical conduction parameter (Φs
cri), beyond which shock ceases to exist. We find that Φs
cri directly depends on the black hole spin (a
k) with Φs
cri ∼ 0.029 and ∼ 0.04 for weakly (a
k → 0) and rapidly (a
k → 1) rotating black hole. Furthermore, we observe that Φs
cri decreases with increasing viscosity (α), and shocked accretion solutions continue to exist for α ≲ 0.065 (a
k → 0) and ≲ 0.104 (a
k → 1), respectively.
Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal
Authors: Hou Mingxia , Fei Hongming , Lin Han , Zhang Mingda 
Published: February 2025

Abstract
A Terahertz (THz) switch is an essential component of a THz communication system. THz switches based on conventional waveguides and photonic crystal structures are sensitive to manufacturing defects and sharp bending, resulting in high scattering losses. In addition, THz switches with tunable working bandwidths haven’t been demonstrated. Here, we design THz switches based on the topological valley photonic crystal (VPC) structure using magnetic materials, which can achieve high forward transmittance based on the unique spin-valley locking effect. The broad working bandwidth allows selectively turning on and off at a designed wavelength region by controlling the applied magnetic field. The designed THz switch can achieve an extinction ratio of up to 31.66 dB with an insertion loss of less than 0.13 dB. The 3 dB bandwidth is up to 49 GHz. Such a tunable THz can be experimentally fabricated by current fabrication techniques and thus can find broad applications in THz communication systems.
Thermal energy confinement time of spherical tokamak plasmas in PI3
Authors: Tancetti A. , Ribeiro C. , Howard S.J. , Coop S. , McNally C.P. , Reynolds M. , Kholodov P. , Braglia F. , Zindler R. , Macdonald C. , Love E. , Carle P. , Feng X. , Rohollahi A. , Leci K. , Plant D. , Dunlea C. , Ivanov R. , Mossman A. 
Published: February 2025

Abstract
The Plasma Injector 3 (PI3) experiment at general fusion has been constructed to demonstrate the ability to form plasma targets suitable for compression in a Magnetized Target Fusion machine. To achieve compressive heating to fusion conditions, the target plasmas should have an energy confinement time sufficiently in excess of the compression time. In this work we present a methodology for calculating this timescale and present results for a large set of discharges. Characterization of the plasma current profiles reveals trends and groupings determined by machine settings. The largest energy confinement times have been obtained for discharges with a broad plasma current profile, fresh lithium coating on the device walls, and a near constant toroidal field. We find that PI3 plasmas at

5

ms

into the discharge can have thermal confinement times in excess of

10

ms

. These meter-scale plasma can thus achieve significant heating if compressed on a timescale of milliseconds.
Experiment and computational fluid dynamics simulation study on the effect of wind disturbance on the collection rate error of rainfall
Authors: Cai Zhao , Gu Yicheng , Liu Hongwei , Wang Wenzhong 
Published: February 2025

Abstract
The accuracy of rainfall data directly determined the precision of hydrological analysis. However, the rain gauges were observed above the ground, and the wind turbulence around the rain gauge mouth affected the accuracy of the observation data. To explore the mechanism of the influence of wind turbulence on the accuracy of rainfall collection and provide a correction formula for this error caused by wind disturbance, the field observation experiments and the CFD (Computational Fluid Dynamics) simulations were performed to analyze the mechanism of influence of wind disturbance in rainfall observation. The experimental results showed that the rain gauge collection rate was 4.3m <0.7m <ground rain gauge (0m), and the rainfall collection rate of 0.7m height rain gauge was about 95% of that of ground rain gauge. The simulation results showed that the high gradient wind velocity distortion region (the wind velocity increases by about 19%) and the vortex raceway below the distortion region were formed in the range of about 5 cm above the rain gauge collector, which caused the uneven force on the precipitation particles in this region, thus reducing the precipitation collection rate. The rainfall correction formula based on the conventional observation elements was given, which provides a theoretical basis for the correction of wind-induced rainfall error and a reference for improving the accuracy of rainfall observation.
Global Well-Posedness and exponential decay of 3D nonhomogeneous Navier-Stokes and magnetohydrodynamic equations with density-dependent viscosity and vacuum
Authors: Tang Xiang 
Published: February 2025

Abstract
We establish the global well-posedness of strong solutions for the inhomogeneous magnetohydrodynamic equations with density-dependent viscosity in three-dimensional bounded domains, where the initial density is permitted to vanish. By skillfully employing various inequalities and scaling techniques, we demonstrate the existence and uniqueness of a global strong solution provided that ||σ(ρ
0)||
Lq

is suitably small. Furthermore, we derive exponential decay rates for the solution. Importantly, no compatibility conditions need to be imposed on the initial data, even when vacuum states are present.
Characterization of bearing capacity of 10 kV distribution line under ice and wind loads
Authors: Liu Yangsheng , Wang Hongfang , Cui Jiaqi , Qiu Hao , Xie Xing 
Published: February 2025

Abstract
It is challenging to test the displacement of distribution lines under ice-cover conditions because of the complexities involved in the measurement and environment setup and the high associated costs. In this paper, the wire type and span distance of the distribution line are determined based on the line’s operating parameters, and the suspended catenary’s initial shape is calculated. A finite element analysis model of the distribution line under ice-loading conditions is established by using simulation software. The model simulates the effects of self-weight load, ice load, wind load, and other typical forces on the bearing capacity of the distribution line. The results demonstrate that the ice thickness of ice cover, span distance, and wire type significantly influence the bearing capacity of a 10 kV distribution line. This study on the bearing capacity characteristics of the 10 kV distribution line under ice and wind load conditions provides valuable insights for the prevention of line failures and damages. Moreover, it offers a reference for the selection of distribution lines in different geographical locations and various engineering applications.
Dynamics analysis of a V-shaped microcantilever based on finite difference method
Authors: Zhang Bangzhi , Zhou Xilong , Yang Changyun 
Published: February 2025

Abstract
The V-shaped microcantilever is advantageous for its high sensitivity and low stiffness, making it suitable as an atomic force microscope probe for characterizing the mechanical properties of soft materials. However, due to the complex geometry and the nonlinear tip-sample interaction, the analysis of the dynamic characteristics of a V-shaped microcantilever is generally difficult. In this paper, the finite difference computational formula of the governing formula and boundary conditions of a V-shaped microcantilever is derived and the analysis of its dynamic characteristics is performed. The amplitude and phase spectroscopy curves of the V-shaped microcantilever, as well as the frequency response, are obtained. The developed finite difference computational formula provides an effective approach for dynamics analysis and the optimization design for the V-shaped microcantilever.
A study of the properties of soft sets on the M-semilattice
Authors: Ma Feifei 
Published: February 2025

Abstract
Integrates the concept of an m-semilattice with the theory of soft sets, and introduces definitions for soft m-semilattices, soft sub-m-semilattices, soft ideals, and ideal soft m-semilattices. Several algebraic properties of soft m-semilattice are proved, especially those after combining the concepts of intersection, union, and direct product of soft sets. After establishing the definition of soft m-semilattice homomorphism, the relationship between m-semilattice homomorphism, m-semilattice isomorphism, soft m-semilattice homomorphism and soft m-semilattice, soft sub m-semilattice, soft ideal, ideal soft m-semilattice is studied.
The design of faraday cup for C-ADS injector I
Authors: Hu Haojiang 
Published: February 2025

Abstract
In this paper, a Faraday cup is designed for the “China Accelerator Driven Sub-Critical System” (C-ADS) Injector I. This Faraday cup is used to absorb the high-energy proton beam, preventing damage to C-ADS Injector I from waste particles. The SRIM program is used to simulate the energy deposition when the proton beam is absorbed by the target material. Thermal analysis is conducted using Ansys software to optimize the material selection for the target and the structure of the Faraday cup. The shape of the target is also discussed in detail. Additionally, a water-cooling structure is presented to further improve the heat dissipation of the Faraday cup. Results indicate that graphite is an ideal material for the target, and pure copper is used as the structural material.
Numerical study on hydraulic and heat transfer characteristics of diamond-shaped staggered rib microchannel heat sink
Authors: Peng Jingbo 
Published: February 2025

Abstract
The present study carries out numerical investigations into the hydraulic and heat transfer characteristics of the microchannel heat sink with staggered diamond ribs (MCHS-SDR or SDR). By quantitatively comparing MCHS with rectangular ribs (MCHS-RR or RR), we can understand the changes in pressure, velocity, and temperature distribution in MCHS with this configuration. In addition, the variation trends of basic maximum temperature, Nusselt number, pressure drop, and efficiency index relative to Re were studied within the range of Reynolds number 100 to 500. The results indicate that in SDR, the slicing effect of diamond ribs affects the working medium, forming alternating cold and hot fluid layers and enhancing heat exchange. By quantitative comparison, it is found that the SDR has a configurational advantage over the conventional RR. Maximum base temperature in SDR is always lower than that in RR under the same Reynolds number, and the efficiency index of SDR can be 2.1 times larger than that of the RR.
Equivalent coefficient of plate stress of stiffened plates under moving slamming load
Authors: Zou Luyao , Qu Xue , He Mengyao , Tang Qi , Song Chenxuan , Wu Jianguo 
Published: February 2025

Abstract
The slamming load acting on the bow of a large-bow flare ship is equivalent to a moving pulse time history with linear rise and exponential attenuation. The Abaqus finite element software is used to study the elastic dynamics of multiple stiffened plates under the action of the moving slamming load. Response calculations are conducted to analyze the influence of different load parameters on the dynamic response of the stiffened plate. The dynamic stress equivalent coefficient DLFps (Dynamic Load Factor of plate stress) of the plate is introduced, the change pattern and sensitivity between DLFps and the slamming load dimensionless parameters are analyzed, and the DLFps formula regression and verification are performed. A parameter determination method for the simplified slamming pressure model is proposed. Comparison with the results of the wedge-shaped body falling into the water test shows that the slamming stress equivalent formula DLFps of the plate proposed in this article has high accuracy and can be used to determine the slamming load of the ship structure.
Analysis of dynamic stress characteristics of suspension frame of medium and low-speed maglev train
Authors: Chen Chunjun , Su En 
Published: February 2025

Abstract
As an important bearing part of maglev trains, the suspension frame of medium and low-speed maglev trains often suffers fatigue damage, which leads to a serious lack of fatigue reliability. Therefore, it is urgent to research the dynamic stress characteristics of the suspension frame. To assess whether the suspension frame of a medium-and low-speed maglev train satisfies the required strength criteria, a comprehensive line test was conducted to evaluate its fatigue strength. Building on these results, the dynamic stress characteristics of the suspension frame under varying operating conditions were analyzed. This investigation focused on identifying the primary frequency sources of dynamic stress, as well as examining the effects of speed variations and different operational scenarios on the dynamic stress behavior of the suspension frame. The results show that the equivalent stress amplitude of each measuring point of the suspension frame will increase with the speed grade, and the most obvious one is the lower bracket area, which increases by 52%.
Lower bound on the smallest eigenvalue of matrices
Authors: Chen Fubin 
Published: February 2025

Abstract
M-matrix is widely used in physics. We establish two new inequalities of l(S*G) for
S, G ∈ μn

by utilizing the Gerschgorin theorem and Brauer theorem. New results are more useful in practical applications since they depend on the matrix’s own elements. Example shows that the new estimating equations are more accurate than some already known conclusions in some circumstances.
A barycentric rational collocation method for higher-order equations related to time
Authors: Qu Xinying , Lin Jiawei 
Published: February 2025

Abstract
In this article, higher-order equations related to time are solved using the barycentric rational collocation method, which aims to approximate the unknown function through a rational function. The equations are solved by using the direct solution, depression of order, and spatial using the barycentric rational collocation method, and then solved by the Runge-Kutta method in three ways. The final example verifies the validity.
A barycentric rational interpolation collocation method for tri-harmonic equations
Authors: Lin Jiawei , Qu Xinying 
Published: February 2025

Abstract
This essay mainly uses the barycentric rational interpolation collocation method to study two-dimensional tri-harmonic equations. By using this method to discretize the tri-harmonic equation, its linear equation is transformed into the corresponding matrix form, and its approximate solution is obtained. The effectiveness of the method compared to other methods is also verified through numerical examples.
Symmetry and monotonicity of solutions for a system
Authors: Ji Xiaoxue , Wei Bing 
Published: February 2025

Abstract
In our thesis, we employ a forth and means of traveling flats for an equation set including completely non-linear non-local operators in B1(0). Under the conditions

ζ

η

∈

C

l
o
c

1
,
1

∩

L
α

and

υ

η

∈

C

l
o
c

1
,
1

∩

L
β

, the symmetric character of radial direction and monotone character of plus solutions for an equation set are proved. In order to get this result, we use the extreme value theory of narrow area for the equation set and pivotal ingredients for carrying on the way of traveling flats.
Structural reliability analysis based on vulnerability function
Authors: Peng Zejing , Tian Wenyu , Yang Mengfei , Liu Junli , Wang Wenzhe 
Published: February 2025

Abstract
This paper proposes a structural reliability analysis methodology based on vulnerability functions, taking into account the uncertainties in seismic excitation and structural seismic response parameters. A probabilistic seismic demand model, following a β-distribution, is introduced to investigate the correlations between seismic response parameters under the same seismic event. The fragility function is constructed by combining the log-normal distribution with correlation coefficients to calculate the probability of structural failure. The fragility curve is fitted using the probability distribution function of the log-normal distribution and compared with the fragility results obtained from traditional fragility functions. A two-span continuous reinforced concrete highway bridge is used as a case study for seismic fragility analysis. The results indicate that when the structure is subjected to seismic intensities exceeding 9 degrees, the correlation becomes significant, which is beneficial for pre-earthquake disaster prediction and structural reliability evaluation.
Picture hesitant fuzzy distance measures and its decision applications
Authors: Wang Jiawen , Cao Jinliang 
Published: February 2025

Abstract
The key role of picture hesitant fuzzy in multi-attribute decision-making is to offer both more detailed and precise decision information. However, the current research on picture hesitant fuzzy distance measures is not perfect, so additional research on this matter is essential. In this paper, we take into account the hesitancy and hesitancy deviation and develop a new distance measure based on hesitancy deviation. Furthermore, we present a new TOPSIS method and apply it to an example. Finally, a parameter sensitivity analysis was performed to verify the stability of the proposed new distance measure.
Transfer of fractional orbital angular momentum in atomic vapor in a five-level system
Authors: Qu Xiaohan , Wang Chunfang 
Published: February 2025

Abstract
We present a theoretical investigation into the transfer of fractional orbital angular momentum (FOAM) in a five-level atomic system and study its interference with a Gaussian field of the same frequency. Through simulations and analysis, we demonstrate that the number of doughnuts in the superposition field remains consistent with that of the FOAM field, meaning the persistent presence of the doughnut-shaped defect. We also observe significant alterations in both spatial intensity distributions and the intensity of the superposition field by increasing the intensity of the control field, and its spatial intensity distributions more clearly exhibit the characteristic of uneven spatial distribution of FOAM vortex light. Interestingly, the intensity distributions within the inner ring of the superimposed field display greater unevenness compared to the outer ring. Additionally, the phase distributions of the superposition field resulting from the interference between the Four-Wave Mixing (FWM) field and the Gaussian field are examined, revealing irregular period distributions consistent with those observed in the FOAM vortex field. These findings provide theoretical support for the propagation and manipulation of FOAM vortex beams in atomic systems, offering potential implications for applications involving fractional orbital angular momentum in atomic systems and enhancing information transmission capacity.
The relationship between the airflow behavior and different proportions of the shape header
Authors: Maximillian Wang Qi , Luo Xin 
Published: February 2025

Abstract
This study focuses on investigating how varying the length-to-width ratio of cone-shaped aerospace vehicle headers affects the velocity distribution of the surrounding airflow. The paper first introduces the background of advancements in aerospace engineering, as well as the critical role of fairings in protecting payloads during launch. Previous research has established the importance of nose cone shape and efficiency for missile and rocket performance, exploring the aerodynamic benefits of pointed vs. conical nose cones, as well as the effects of length-to-width ratios on high-speed performance. However, existing studies have not systematically analyzed the impact of varying the geometric ratios of a single cone-shaped header on the surrounding airflow characteristics. Using numerical simulation methods, this paper examines the aerodynamic properties of cone-shaped headers with length-to-width ratios of 2:1, 4:1, and 8:1, while maintaining constant inflow conditions and other parameters. Computational fluid dynamics (CFD) simulations were conducted by using ANSYS Fluent software to generate velocity distribution plots around the different header configurations. The results show that as the header aspect ratio increases, the airflow distribution becomes more uniform, the boundary layer separation point moves further aft, and the vortex regions gradually diminish. Specifically, the 2:1 aspect ratio header exhibited a large velocity gradient, early boundary layer separation, and intense vortex formation, indicating relatively poor aerodynamic performance. In contrast, the 8:1 aspect ratio header demonstrated the most favorable aerodynamic characteristics, with the most uniform velocity distribution, the latest boundary layer separation point, and minimal vortex generation. These findings suggest that increasing the length-to-width ratio of cone-shaped headers can significantly improve their aerodynamic performance, reduce drag, and enhance the efficiency and fuel economy of aerospace vehicles. The insights provided by this research offer an important foundation for further optimizing header designs. Future work could expand the analysis to three-dimensional simulations, incorporate experimental validation, and explore the aerodynamic characteristics under hypersonic conditions, further advancing the understanding of header aerodynamic behavior to better inform aerospace vehicle design.
High-order schemes with mass and energy conservation for solving the one-dimensional Zakharov system
Authors: Li Yanjing , Zong Xinyu , Zhang Jinqi , Li Xianggui 
Published: February 2025

Abstract
In this paper, we present high-order schemes to solve the Zakharov system (ZS) with periodic initial values. Semi-discrete schemes are capable of perfectly preserving the conservation of mass and energy. When we use the Crank-Nicolson (CN) method in time, we obtain full-discrete schemes that ensure the conservation of mass. Full-discrete schemes can achieve second-order accuracy in time and fourth-order and sixth-order accuracy in space. The presented numerical results aim to test accuracy order, examine conservation property, and simulate dynamic behavior.