bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Lewis acid-base additive on lead-free Cs2SnI6 thin film prepared by direct solution coating process
Authors: Khan Saqib Nawaz , Wang 王 Yan 燕 , Zhong 钟 Lixiang 李祥 , Liang 梁 Huili 会力 , Du 杜 Xiaolong 小龙 , Mei 梅 Zengxia 增霞 
Published: May 2024

Abstract
Inorganic Cs2SnI6 perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelectronic properties and remarkable stability in ambient conditions. The charge transport characteristics within perovskite films are subject to modulation by various factors, including crystalline orientation, morphology, and crystalline quality. Achieving preferred crystalline orientation and film morphology via a solution-based process is challenging for Cs2SnI6 films. In this work, we employed thiourea as an additive to optimize crystal orientation, enhance film morphology, promote crystallization, and achieve phase purity. Thiourea lowers the surface energy of the (222) plane along the 〈111〉 direction, confirmed by x-ray diffraction, x-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy studies, and density functional theory calculations. Varying thiourea concentration enables a bandgap tuning of Cs2SnI6 from 1.52 eV to 1.07 eV. This approach provides a novel method for utilizing Cs2SnI6 films in high-performance optoelectronic devices.
Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal NbxZr1–xCo2Sn
Authors: Chen 陈 Bo-Wen 博文 , Shen 沈 Bing 冰 
Published: May 2024

Abstract
Magnetic topological semimetal can host various topological non-trivial states leading to exotic novel transport properties. Here we report the systematic magneto-transport studies on the Heusler alloy Nb
x
Zr1−x
Co2Sn considered as a ferromagnetic (FM) Weyl semimetal. The cusp anomaly of temperature-dependent resistivity and large isotropic negative magneto-resistivity (MR) emerge around the FM transition consistent with the theoretical half-metallic predictions. The prominent anomalous Hall effect (AHE) has the same behavior with the applied field along various crystal directions. The Nb doping introduces more disorder resulting in the enhancement of the upturn for the temperature-dependent resistivity in low temperatures. With Nb doping, the AHE exhibits systemic evolution with the Fermi level lifted. At the doping level of x = 0.25, the AHE mainly originates from the intrinsic contribution related to non-trivial topological Weyl states.
Surface phonon resonance: A new mechanism for enhancing photonic spin Hall effect and refractive index sensor
Authors: Cheng 程 Jie 杰 , Wang 汪 Chenglong 承龙 , Li 李 Yiming 一铭 , Zhang 张 Yalin 亚林 , Liu 刘 Shengli 胜利 , Dong 董 Peng 鹏 
Published: May 2024

Abstract
Metal-based surface plasmon resonance (SPR) plays an important role in enhancing the photonic spin Hall effect (SHE) and developing sensitive optical sensors. However, the very large negative permittivities of metals limit their applications beyond the near-infrared regime. In this work, we theoretically present a new mechanism to enhance the photonic SHE by taking advantage of SiC-supported surface phonon resonance (SPhR) in the mid-infrared regime. The transverse displacement of photonic SHE is very sensitive to the wavelength of incident light and the thickness of SiC layer. Under the optimal parameter setup, the calculated largest transverse displacement of SiC-based SPhR structure reaches up to 163.8 μm, which is much larger than the condition of SPR. Moreover, an NO2 gas sensor based on the SPhR-enhanced photonic SHE is theoretically proposed with the superior sensing performance. Both the intensity and angle sensitivity of this sensor can be effectively manipulated by varying the damping rate of SiC. The results may provide a promising paradigm to enhance the photonic SHE in the mid-infrared region and open up new opportunity of highly sensitive refractive index sensors.
Loss Analysis of the Electromagnetic Metamaterial Applied to Antenna Size Reductions
Authors: Pang Xudong , Chen Qun , Cao Beibei , Zhu Shouzheng 
Published: May 2024

Abstract
The research of transformation electromagnetics uses spatial coordinate transformation method to transform Maxwell’s equations for the propagations of electromagnetic waves in space, thereby achieving the goal of designing the path of electromagnetic waves, which eventually leads to a more complex tensor design of its constitutive parameters of metamaterials. This demand for artificial design of material parameters has been combined with the rapid development of micro-scale, molecular-scale, and atomic-scale experimental engineering techniques in recent years, enabling metamaterials to be developed, fabricated, and applied in various frontier fields. In this paper, the metamaterial electromagnetic wave concentrator used to reduce the antenna size is mainly discussed and detailed simulations and researches on the electromagnetic lossy conditions of the metamaterial parameters are given, which can better verify the electromagnetic scattering performance under actual engineering conditions. Solutions and quantitative simulations for the attenuation characteristics are also provided, which can deepen the research on the engineering performance of the metamaterial electromagnetic transformation devices.
A Unified Model-Based System and Integrated Logistics Support Architecture Modeling Framework
Authors: Sun Shuhuan , Liu Peng , Liu Zhaoxing , Guo Yuqiang 
Published: May 2024

Abstract
Model-based system engineering(MBSE) uses the architecture model to drive system development. It has been widely used in aeronautical and aerospace systems development. Integrated Logistics Support(ILS) design is an essential part of system engineering. Still, there is no clear guidance on how to perform model-based ILS architecture modeling. This paper proposes a unified model-based system and ILS architecture modeling framework, which analyzes the relationship between the system and ILS in different life cycle concepts and gives a clear ILS architecture modeling approach. The unified system and ILS architecture modeling way will take full advantage of the model from the mission level to the system level to guarantee the different architecture perspectives consistency and save cost and time in the engineering practice.
Research on the Optimal Layout of Large Chicken Coop Chicken Rack Based on Ventilation Airflow Organization
Authors: Wu Shuyang , Shi Zhigang , Qu Zhiguang , Gao Xinming 
Published: May 2024

Abstract
To address the challenges associated with airflow organization in chicken coops within the Chinese poultry industry, this study conducted on-site measurements and utilized Computational Fluid Dynamics (CFD) simulations. The validity of the simulation results was confirmed through root mean square error analysis in comparison to experimental data. Subsequently, the study assessed the influence of different chicken rack arrangements within the coops, both when wet curtains were closed and opened. The findings reveal that, when wet curtains are closed, the internal coop layout significantly impacts chicken welfare, especially concerning layout changes relative to coop length. When wet curtains are open, the impact of coop layout and a 10-meter reduction in coop length on chickens is approximately equivalent. The arrangement of chicken racks within the coop has a profound effect on airflow organization. Therefore, when designing coops, careful attention to chicken rack placement is essential to ensure proper airflow organization.
An accelerated hybrid Riemannian conjugate gradient method for unconstrained optimization
Authors: Zhang Jinchao , Zhu Wei , Wang Wei , Wu Zhaochong , Zhang Xiaojun 
Published: May 2024

Abstract
With the goal to deal with a series of optimization problems on general matrix manifolds with differentiable objective functions, we propose an accelerated hybrid Riemannian conjugate gradient technique. Specifically, the acceleration scheme of the proposed method using a modified stepsize which is multiplicatively determined by the Wolfe line search. The search direction of the proposed algorithm is determined by the hybrid conjugate parameter with computationally promising. We showed that the suggested approach converges globally to a stationary point. Our approach performs better than the state of art Riemannian conjugate gradient algorithms, as illustrated by computations on problems such as the orthogonal Procrustes problem and the Brockett-cost-function minimization problem.
Study on Rock Mechanical Properties of Deep Volcanic Rock Reservoir
Authors: Qiu Guozhou , Chang Xin , Li Jing , Xie Ruiyang , Liu Jingheng , Li Jing 
Published: May 2024

Abstract
Volcanic rocks exhibit complex mechanical properties due to their special diagenetic forms. Laboratory tests were conducted to study the influence of confining pressure changes on the mechanical properties of deep volcanic rocks, and outcrop volcanic rocks single triaxial tests were conducted simultaneously to study the mechanical properties of deep volcanic rocks. The maximum deviatoric stress and elastic modulus are used to study the variation of mechanical properties of volcanic rocks with confining pressure. The maximum deviatoric stress of underground core increases linearly with the increase of confining pressure. The elastic modulus reaches its maximum at 80MPa confining pressure. Although the variation trend of mechanical parameters of underground core with confining pressure is similar to that of outcrop core with confining pressure, the underground core shows a larger maximum deviatoric stress and elastic modulus. It can be seen from the 80MPa confining pressure comparison test that the mechanical properties of underground core under high confining pressure are superior to those of outcrop core. The mechanical properties of outcrop core under high confining pressure are significantly affected by natural fractures, while the mechanical properties of underground core are less affected by natural fractures.The brittleness index of volcanic rocks decreases with the increase of confining pressure, and the decreasing range is relatively low. The brittleness index of outcrop volcanic rocks decreases with the increase of confining pressure, but its sensitivity to confining pressure is much higher than that of underground core.
Experimental Study on Spray Uniformity
Authors: Chen Dianbin , Li Hongwei , Qu Guiying , Han Xiaobo , Han Dongfei 
Published: May 2024

Abstract
This study involves simulating rainfall conditions to analyze rainfall intensity and spray uniformity, conducting environmental experimental research. Using numerical analysis methods, water mass fraction cloud maps under different flow conditions were obtained to determine the relationship between uniformity, water flow rate, and water mass fraction. Based on the simulation results in accordance with relevant standards, two methods for measuring rainfall uniformity are selected based on water pressure, nozzle type, and spray height as basic parameters for setting measurement points, and rainfall environmental simulation experiments are conducted. The theoretical analysis provides a clearer representation of water quality distribution than steady-state analysis; water mass fraction is proportional to water flow rate, while uniformity is independent of water flow rate. Through comprehensive comparison of uniformity data for different nozzle models under varying water pressure and height conditions, recommendations are made for the placement of rain gauges in rainfall environmental experiments. Adjusting various test environment parameters can provide references for the test lab to accurately select test equipment, parameter measurement, and evaluation; the water mist environment generated during rainfall is simulated through spray towers, and the numerical uniformity test results of the water mist environment are consistent with the requirements, providing theoretical data support for developing more authoritative test methods for equipment sprinkler tests and ultra-fine water mist environment simulation in the future.
Modeling and Simulation of Unmanned Swarm System Based on Dynamic Structure DEVS
Authors: Zhang Wangyang , Li Qingwei , Xu Xin , Li Weiqing 
Published: May 2024

Abstract
As a complex system with collaborative cooperation and capability emergence, the unmanned swarm system plays an important role in military, agriculture, aerospace and other fields. With the increasing complexity of unmanned swarm systems, traditional modeling methods cannot effectively describe the dynamics of swarm systems. In order to effectively design, use and evaluate unmanned swarm systems, this article conducts modeling and simulation of unmanned swarm systems based on DSDEVS(Dynamic Structure Discrete Event System Specification). Describe the unmanned swarm system from both behavioral and structural aspects. Based on component modeling, the microscopic behaviors of the unmanned platforms that constitute the unmanned swarm are described, and coupling relationships are established to describe the collaborative structure between unmanned platforms. According to the state transfer and event interaction characteristics of the unmanned swarm system, a synchronization mechanism is added to support changes in the swarm structure. This enables the unmanned swarm system to make adaptive structural adjustments according to environmental changes and its own goals during simulation operation, so as to achieve a state of enhanced capabilities and structural stability to complete the task. Finally, the effectiveness and feasibility of this method were verified through a simulation experiment of joint reconnaissance by a UAV swarm.
Optimization of the Internal Ballistic Performance of Supercritical Nitrogen Ejection
Authors: Qian Hongjun , Niu Yusen , Jiang Yi , Zhang Jingli 
Published: May 2024

Abstract
This paper investigates a scheme of introducing TNT into a high-pressure chamber containing supercritical nitrogen as the working substance to enhance the utilization of the working substance and the mass of the ejection missile. Based on the S-R-K real gas state equation and the quasi-static pressure and temperature prediction model of TNT, the internal ballistic equations for supercritical nitrogen are established for a missile of 30000 kg, so as to demonstrate the scheme for ejecting a large mass missile and analyze its optimization. Meanwhile, the influence of the high-pressure chamber volume and TNT initiating time on internal ballistic performances is studied, respectively. Simulation results indicate that when the capacity of the high-pressure chamber decreases and the initiating time is delayed, the peak acceleration of the missile and its ejection velocity could be steadily lowered, but the utilization of nitrogen working substance increases. Moreover, the duration of high temperatures in the low-pressure chamber increases as the delay of the initiating time grows. These conclusions could be utilized as a reference for optimizing the design of ejectors.
Launch Dynamics Analysis of Amphibious Launch Vehicle on the Sea
Authors: Cai Yunlong , Ren Ruoyu , Yi Jiang 
Published: May 2024

Abstract
Due to its agility, concealment and excellent amphibious combat capability, amphibious vehicles can perform tasks in complex terrain and environment, and have important application value in the field of national defense and people ’s livelihood. In this paper, the method of experimental data-driven numerical simulation analysis is used, combined with batch simulation technology, and the frequency histogram in probability statistics is used to study the launch safety of amphibious vehicles under random waves, and the influence of missile launch sequence and launch time interval on missile launch is explored. The results show that the driving and sea launch of the amphibious vehicle are safe under the experimental conditions. The partial attitude angle of the car body and the attitude angle of the missile roughly conform to the normal distribution; considering the relationship between the weight of the vehicle body and the ejection load impulse, the launch sequence and the launch time interval will not have a great impact on the missile launch. By evaluating the driving safety of the amphibious vehicle and the launch safety of the missile, this paper can provide some theoretical significance and engineering application value for the sea launch of the amphibious vehicle.
Radiation Damage Simulation Using Molecular Dynamics in Ni-Based Alloy
Authors: Shen Yanxin , Yang Yue , Ou Xuelian , Wang Peng , You Zhenjiang , Tian Xiaofeng 
Published: May 2024

Abstract
In the present study, we investigated the irradiation-induced induction in Ni80Cr20, Ni80Fe20, Ni50Fe50, Ni40Fe40Cr20 by molecular dynamics (MD) simulation. A previously published modified potential is used to provide a detailed account of the process involved in the production and evolution of defects. Ni50Fe50 and Ni40Fe40Cr20 alloys exhibit comparable damage level and better radiation response compared to Ni80Cr20 and Ni80Fe20. The inhibition effect of interstitial clusters increases with the complexity of alloying elements. The alloying of Cr has resulted in Ni80Fe20 and Ni50Fe50 tend to form 1/3<111> dislocation loops while at the same time making Ni40Fe40Cr20 and Ni80Cr20 more susceptible to stacking fault tetrahedra formation than the remaining two alloys.
Comparative Analysis of Influencing Factors on Heat Extraction Performance of Multi-Type Shallow Borehole Heat Exchangers
Authors: Xue Yuze , Chen Fei , Sun Wan , Guo Siyu , Kong Yanlong , Cai Wanlong , Wang Fenghao 
Published: May 2024

Abstract
In this paper, the influence of design parameters and geological parameters on the heat extraction capacity of common coaxial type, single U-type, and double U-type borehole heat exchangers(BHEs) in shallow ground source heat pump system is analyzed, and the heat extraction performance of different types of BHEs is further compared. The results show that with the increase in borehole depth and ground temperature gradient, the outlet temperature of the three types increases at the end of the heating season, and the single U-type BHE increases most significantly. The increase in inlet flow rate will decrease the outlet temperature of the three BHEs, and the U-type is the most obvious decrease. The increase in inlet temperature will reduce the temperature difference between inlet and outlet of the three types BHEs. Given the same design parameters, coaxial-type BHE obtains the maximum heat.
Simulation Optimization on Multi-Well Fracturing Sequence of Chang 7 Formation
Authors: Weng Dingwei , Ma Zeyuan , Tian Zhuhong , He Chunming , Liang Hongbo , Guo Ying , Yan Xuemei , Yang Zhanwei , Chen Zhuxing 
Published: May 2024

Abstract
In order to study the engineering problems of shale oil horizontal well platform fracturing mode, a three-dimensional geological model and a three-dimensional geomechanical model were constructed according to the characteristics of Chang 7 section in Ordos Basin. The fracture propagation under different well spacing, cluster spacing, and fracturing sequence was simulated. The PEBI grid was used to refine the local grid of the fractures and predict the performance of the multi-well pad. The finite element model was used to analyze the change of induced stress field. The numerical simulation analysis shows that: 1) Comparing the simulation results of sequence fracturing and zipper fracturing under the condition of 300 m well spacing, the induced stress generated by zipper fracturing is more conducive to the formation of complex fractures, improving the effect of transformation and higher production after fracturing. 2) Under the condition of 200 meters or 300 meters well spacing, zipper fracturing is carried out, and the cluster spacing is reduced from 5 meters to 3 meters. The stress shadow between wells and sections leads to adverse effects, and the production will decrease after fracturing. Therefore, 5 meters is recommended as the cluster spacing.
Research on Overload Early Warning System for Railcars
Authors: Zhu Lingfeng , Xue Shangqing , Chen Zixing , Bai Bingfeng , Mei Yueyuan , Chen Limin 
Published: May 2024

Abstract
Railcars are prone to suffer from overloading problems during its operation, which seriously affects the service life of railcars and rails, while posing a serious potential safety hazard. This paper In this paper, the weight of the car load is calculated by installation of a gravity sensor on the railcar and collection of the data from the gravity sensor through applying the A/D conversion module of the MCU. The overloading warning function of railcars is realized according to the drive alarm indicator of overloading information, and displaying the overloading information on the liquid crystal display screen.
The Experimental Method of Sparse Measurement Based on Target’s Radar Cross Section Data
Authors: Wei Ziran , Du Wei , Huang Yulu , Zhang Ting 
Published: May 2024

Abstract
In experiments of testing targets’ radar cross section (RCS), RCS is a measure of the target’s ability to reflect radar signals in the direction of radar reception. In order to take non blurry spatial-domain imaging of the target, sampling or measuring the target’s RCS signal must meet the Nyquist sampling theorem. However, RCS testing in microwave darkroom would produce a significant amount of sampling data, which requires a very long testing period. Based on the sparsity of spatial-domain RCS data after sparsifying transformation, a sparse projection measurement experimental method is designed for frequency-domain RCS data by sparsely sampling frequency-domain signals, fully utilizing the correlation between row and column information of two-dimensional frequency-domain data and the global sparsity of two-dimensional spatial-domain data. Finally, based on sparsely sampled data in the frequency-domain, the original RCS data is reconstructed by reconstruction algorithms, achieving the goal of effectively reducing RCS sampling data in RCS testing experiments.
Numerical-Study of Large-Liquid Rocket Plume-Flow-Field
Authors: Ren Fantao 
Published: May 2024

Abstract
Aiming at the complexity of plume field structure caused by plume collision in the rising section of multi-nozzle parallel rocket, this paper establishes an analytical model of the rising section of a nine-nozzle configuration rocket. The plume field phenomenon is studied at different heights through numerical simulation. The reliability of the numerical method is verified based on the comparison of simulation and wind tunnel test data. The analytical results. Show that violent collision occurs between the jets in the ascent section of the multi-nozzles rocket, and many phenomena such as circulating vortex, gas reflux, reflux back splash and so on occur at different altitudes. When the altitude is less than 25km, gas reflux and circulation vortex appear in the rocket base. With the increasing of altitude, the jet collision impacts the base. After the altitude reaches 45km, back splash appears in some areas of the rocket base. There is an obvious flow diversion phenomenon on the side wall surface. The higher the altitude, the greater the expansion angle of the jet after the gas exits the nozzle.