bluuebunny/crossref_metadata_2025_split huggingface dataset:
Condition Evaluation and Replacement Method of Damp Cable
Authors: Wang Lei , Niu Lin , Zhang Zhenhai , Guo Lijuan , Chen Lina , Zhang Bingqian 
Published: March 2024

Abstract
Cable lines are now being widely used. According to statistics data, cable dampness is the main factor affecting the operation of cable lines at present. If the cables are damp, evaluate the degree of damp and replace the cables that are severely damp in sequence. In this paper, the physical and chemical properties, mechanical properties and dielectric properties of the cable are used to evaluate the status of the cable. By comparing the length and carrying capacity of cables in operation, the degree of damp was sorted by skyline algorithm, and the most serious cables were replaced first.
Influence of Filler/Binder Ratio on the Fatigue Behavior of Epoxy Asphalt Concrete
Authors: Li Kuan , Xie Jianguang , Pan Youqiang 
Published: March 2024

Abstract
To further explore the influence of the filler/binder (F/B) ratio on the fatigue behavior of epoxy asphalt concrete (EAC), in this study, three typical F/B ratios are designed according to the EAC pavement of steel bridges in China, including 1.49, 1.95 and 2.48. The four-point fatigue behavior of the EAC with various F/B ratios was tested and analyzed. The results show that a higher F/B ratio leads a more rapid increase in the ratio of dissipated energy change (RDEC) during limited loading repetitions, as well as an increased likelihood of irreversible damage and a shorter fatigue life for the EAC. To ensure adequate fatigue performance of the EAC, it is recommended that the F/B ratio be controlled below 1.95.
Analysis of Buckling Property of Portal Steel Plate Shear Wall Member Used for Steel Frame
Authors: Shi Yaying , Wang Huake , Duan Yuezhen , Wang Xintang 
Published: March 2024

Abstract
A set of portal steel plate shear wall members are numerically studied, and effect of some factors on its buckling property and stiffeners used for avoiding its buckling is especially discussed. It is concluded that three stiffening forms presented here have a better effect on the buckling performance of the portal steel plate shear wall member. The buckling coefficient of various portal steel plate shear walls with 6m span are slightly lower than those with 4m and 5m span, which means that the increase of span will reduce the buckling performance and out of plane instability bearing performance of portal steel plate shear walls studied here. The buckling performance requirements can be met by using the stiffening form I as if thickness of the portal steel plate shear wall take as 16mm for the stell framed structures below 10 stories.
Microstructure and Mechanical Properties of Cermet Composite Coating on TC4 Surface
Authors: Zheng Lijuan , Xie Yinkai , Zhang Kuo , Fu Yuming 
Published: March 2024

Abstract
In order to improve the surface quality and performance of TC4, the TC4-HfC-TaC metal-ceramic composite cladding coating was prepared on the surface of TC4 by using different process parameters by laser cladding technology. Through digital testing equipment, the macro morphology, molten pool size, dilution rate, Rockwell hardness (HRC), geometry, microstructure and other comprehensive properties of the coating are studied and analyzed. The results show that the performance characterization of TC4-HfC-TaC cladding layer is closely related to the melting state of refractory carbide ceramic phase HfC and TaC powder, when the laser beam energy density is not enough to completely melt the ceramic phase powder, with the increase of energy density, the coating surface tends to be flat, the molten pool size and dilution rate increase, the hardness gradually increases, the metallographic structure is refined uniformly, and the surface quality is improved. Excessive energy density of the laser beam can easily lead to excessive dilution rate of the cladding layer, reduced coating hardness, coarse metallographic structure, and reduced surface quality. Finally, the best combination of process parameters was screened out: laser power 3000 W, scanning speed 300 mm/min, spot size 2.5 × 11.5 mm, rectangular spot lap rate 40%, preset powder thickness 1.5 mm, at which time the coating hardness increased to 63.22 HRC. It is about 2.1 times the hardness of TC4 substrate, with the best performance, and the metallographic structure is densely arranged fine cell-like crystals, with outstanding microscopic characteristics, which realizes the purpose of preparing high-quality TC4-HfC-TaC cermet composite cladding coating on the surface of TC4 titanium alloy.
Study on Crystallinity and Magnetic Properties of NiCuZn Ferrite Films Deposited by RF Sputtering
Authors: Zhou Zhen , He Jing 
Published: March 2024

Abstract
Nickel-zinc ferrite proves to be the top-performing material in terms of soft magnetic features for high-frequency applications. The purpose of this study is to explore the impact of various factors such as sputtering pressure, substrate temperature, sputtering power, and sputtering gas, on the magnetic and structural properties of NiCuZn ferrite thin films. In this research, radio-frequency magnetron sputtering of NiCuZn ferrite thin films on silicon substrates was used to investigate the matter. The study demonstrates that reducing sputtering pressure enhances the crystallization of NiCuZn ferrite films and improves their magnetic properties. The saturation magnetization and crystallinity of the thin films initially increased, then decreased as substrate temperature and sputtering power increased. Furthermore, the sputtered films exhibited higher crystallinity and saturation magnetization in a pure Ar atmosphere compared to an oxygen-containing environment. In this study, we optimized the sputtering parameters to achieve a maximum saturation magnetization strength of 253 emu/cc.
Seismic Response Analysis of Multi Span Hyperbolic Brick Arch Thin Shell Structure
Authors: Si Jianhui , Ma Peiyuan , Niu Xiaoyu , Ju Junpeng , Zhou Ming , He Lizhe , Wang Yi , MajidKhan Abdul 
Published: March 2024

Abstract
The research objective is to investigate the multi-span hyperbolic brick arch thin-shell structure located in Changleyuan, Baoji City, Shaanxi Province. The study utilizes on-site dynamic testing and finite element numerical simulation methods to analyze the dynamic characteristics of the thin-shell structure and its seismic response under various seismic waves and directions. The simulation results indicate the following findings: Vertical earthquakes cause more severe damage to structures compared to horizontal earthquakes. Bidirectional seismic excitation has a greater impact on the structure than unidirectional and three-dimensional seismic excitation. The obtained results provide a scientific basis for the seismic protection, reinforcement, and repair of this multi-span double-curved brick arch thin-shell structure.
Research on Mode Switching and Energy Management of Hybrid Electric Vehicle
Authors: Tang Chuanyin , Pan Bingyu , Wu Longjie , Li Jinghong , Wei Meirong 
Published: March 2024

AbstractAiming at the optimization of mode switching control and energy management strategy for parallel hybrid electric vehicles, a mode switching control method and A-ECMS steady-state energy management strategy is proposed. Firstly, in order to effectively suppress the impact caused by mode switching, and a fuzzy controller is designed for clutch engagement displacement. Then, on the basis of ensuring the smoothness of mode switching, A-ECMS control strategy based on SOC feedback is established. Finally, Isight and Cruise are used to build a co-simulation platform, and multi-island genetic algorithm is used to study the influence of initial value selection of equivalent factor on the controller. The results show that the proposed mode switching control and energy management control strategy, combined with A-ECMS strategy, can effectively improve the vehicle fuel economy on the basis of ensuring the mode switching smoothness.
Effects of Selenium Ions on the Growth of Rice Seedlings
Authors: Li Feng , Yao Yushuang , Guo Weichao , Wu Zhengwei , Yang Shaoxia , Liu Ying 
Published: March 2024

Abstract
For investigating the effect of selenium on the growth of rice seedlings, this study used different concentrations of selenium ions (0, 0.5, 5, 10 and 20 µmol/L) to treat rice seedlings hydroponically. The experimental findings demonstrated that rice seedlings could grow and develop properly in the presence of a selenium deficiency (0 mol/L). Selenium ions had a positive impact on the development of rice seedlings at low and middle selenium concentrations of 0.5 mol/L and 5 mol/L, boosting plant height, above-ground fresh and dry weights. Selenium ions had a substantial inhibitory impact on the development of rice seedlings at high selenium concentrations of 10 mol/L and 20 mol/L.
Efficient Removal of Trivalent Iron and Sulfate from Coal Mine Gushing Water Using Zero-Valent Iron Powder Combined with Hydrogen Peroxide
Authors: Chen Junwen , Chen Jiancheng , Li Qiongyao , Tang Binlin , Gu Chunyao , Gan Min , Zhu Jianyu , Jiang Zongman 
Published: March 2024

Abstract
The high concentration of trivalent iron (Fe3+) and sulfate (SO4
2-) ions in coal mine gushing water is a major ecological hazard and difficult to treat industrially. In this paper, effective purification of coal mine gushing water was achieved by the two-step cyclic process using zero-valent iron (ZVI) powder and hydrogen peroxide. We investigated the effect of different doses of ZVI and hydrogen peroxide on the removal of Fe3+ and SO4
2-. Single-factor experiments indicated that as the dosage of ZVI increased, the removal of Fe3+ increased and then decreased, with the highest Fe3+ removal rate approaching 100% at the ZVI dosage of 100 mg/L, while the maximum removal rate of SO4
2- for sulphate was achieved at 400 ppm of hydrogen peroxide. The precipitate produced in the purification system was characterized and the results demonstrated that it was a typical secondary mineral, schwertmannite, and that it contained considerably more iron and sulfate than the precipitate formed by the natural sedimentation process in coal mine gushing water. Overall, after the two-step cycle process, Fe3+ and SO4
2- can be effectively removed via the formation of schwertmannite, and the ion concentrations all meet the discharge standards for Chinese mining industry wastewater.
Early Identification of Geological Disasters in Loess Hilly Area of Ningnan Based on InSAR Technology: A case study of Yuanzhou District, China
Authors: Wang Hui , Zhang Jia , Gong Yongfeng , Wang Guorui , Hu Zhiyong 
Published: March 2024

AbstractUsing small baseline subset InSAR (SBAS-InSAR) technology and multi-temporal synthetic aperture radar data, multitemporal phase and long-term sequential deformation monitoring and early identification of geological hazards were carried out in the loess hilly area of southern Ningnan-Yuanzhou area. Based on the analysis of radar visibility in the loess hilly area of southern Ningxia. The Sentinel-1A historical archived data of 36 periods from January 2019–December 2021 and descending orbit data from January 2019–May 2021 were used to carry out monitoring of surface deformation in the river basin, and a total of 61 hidden danger. 49 new concealed high risk points were identified by comprehensive optical remote sensing interpretation. The annual average deformation rate of the radar line-of-sight direction of the ascent data was -47.6746–71.6472mm/a, and the cumulative deformation variable was -81.20–121.61mm. There were 23 new concealed high risk points identified. The annual average deformation rate was -72.1574–51.6028mm/a, and the cumulative deformation variable was -165.6–112.4 mm. During the descending orbit, there were 21 obvious deformations and 16 newly discovered geological hazards. Taking a group of ascending orbit deformation zones in Yuanzhou District as an example, which proved that the application of SBAS-InSAR technology in the loess hilly area of Ningnan was feasible.
CFD analysis of wing-propeller interaction on the NASA X-57 Maxwell aircraft wing
Authors: Patil A. , Navrátil J. 
Published: March 2024

Abstract
Due to global warming concerns, the Aviation industry is trying to reduce its carbon footprint. Electric propulsion (EP) is one way of doing this, where the power is obtained from electrical sources. The concept of distributed electric propulsion (DEP) is in the focus now. NASA’s X-57 Maxwell, a high winged, all-electric experimental aircraft, uses this concept. The present work aims at developing a CFD model (ANSYS Fluent) to evaluate aerodynamic performance of two configurations of NASA’s X-57 aircraft wing; (i) wing and nacelle (clean wing) and (ii) wing, nacelle and one electric propeller under cruise condition; and compare it with the results of wind tunnel experiment performed by NASA/Armstrong X-57 research program. Parameters like lift, drag and pressure coefficients (CL, CD, CP) are compared for both cases. A good match is observed for CL, CD and CP, thus validating the model. The unsteady RANS solver is very efficient in capturing the effects of propeller slipstream on the wing. After validation, this model is further used to simulate aerodynamic performance of a wing with multi-propeller (DEP) configuration.
Prediction of environmental benefits introducing hybrid-electric propulsion on regional aircraft
Authors: Sirtori Gabriele , Trainelli Lorenzo , Riboldi Carlo E.D. 
Published: March 2024

Abstract
The objective of this paper is to assess the environmental benefits arising from the introduction of hybrid-electric propulsion on regional and commuter turboprop aircraft. A great focus is put on the propulsion based on a turbine engine coupled with batteries, combining mature technologies. The introduction of novel propulsion architectures on aircraft deployed on regional and commuter networks allows a substantial reduction of the fuel needed by airlines. In this work, scenarios based on real airline networks are presented, in order to quantify the reduction of greenhouse gas emissions possible considering the expected technological advancement for 2035 and 2050. This analysis is conducted by retrofitting the hybrid-electric propulsive system onto existing aircraft that can carry 19 passengers (Dornier DO228) or 70 passengers (ATR72-600). For the 19-seat class, a clean sheet design is also considered to overcome some limitations of the reference aircraft. A precise assessment of the peculiarities linked to the chosen propulsive configuration shows that networks that have shorter flights are better suited to the introduction of this technology, as the restriction on the design payload is less stringent. The proposed propulsive architecture allows a reduction of the operators’ yearly fuel budget of up to 50% in 2035 and 80% in 2050. At last, the taxi phase is of particular importance for regional aircraft that perform several rotations a day, therefore a further analysis of this phase is carried out. The result shows that the considered aircraft are capable of completing a full Landing & Take-Off (LTO) cycle without resorting to the thermal part of the propulsive system, reducing considerably the impact of the aircraft on the airport area.
Evolved version of Advanced Weather Awareness System in the COAST Project: latest developments and validation
Authors: Montesarchio M , Zollo A L , Ferrucci M , Bucchignani E 
Published: March 2024

Abstract
In the framework of the COAST (Cost Optimized Avionics SysTem) project, the Integrated Mission Management System (IMMS) has been developed, a technology aimed to automatically optimize the trajectory of Small Air Transport (SAT) vehicles considering, among possible obstacles, weather conditions, air-traffic and terrain. It is based on the interaction of the evolved versions of three systems, realized within COAST, including the Advanced Weather Awareness System (AWAS), devoted to provide on-board data regarding weather hazards monitored and forecast. The Evolved-AWAS technology has been developed by introducing several enhancements to its baseline version, in order to generate additional information required by IMMS for trajectory optimization. The current work describes the latest developments of Evolved-AWAS and the tests carried out to validate the prototype. All the new functionalities were tested verifying the correct generation of output data needed by IMMS and their visualization into the HMI (Human Machine Interface). The positive results of the performed tests ensured the proper functioning of the software, allowing its integration in the IMMS technology. Finally, the paper reports the outcomes of the last COAST flight demonstration campaign held in June 2023, which revealed the correct behaviour of the Evolved-AWAS, as well as of the overall IMMS.
Closed-loop control of a 3D printed soft actuator with integrated flex sensors and SMA wires
Authors: Wang Zhenbi , Acevedo-Velazquez Aline Iobana , Annadata Achyuth Ram , Winkler Anja , Röbenack Klaus , Modler Niels 
Published: March 2024

Abstract
This article presents a soft SMA-driven actuator capable of achieving desired bending angles. To create the actuator, flex sensors and Shape memory alloy (SMA) wires were embedded into the thermoplastic polyurethane (TPU) matrix of the sample during the 3D printing process. By deactivating and activating the two SMA wires according to sensing signals from the flex sensors, the actuator sample can track the input bending angle. This approach enabled closed-loop control and improved the overall efficiency of the system. Additionally, the proposed manufacturing process provides a simple and cost-effective solution for the rapid prototyping and custom design of smart materials with complex structures and high resolutions.
Preliminary Analysis and Optimization via CFD of a Liquid Hydrogen Pressure Regulating Piston Valve
Authors: Safaei Arash , Dalla Vedova Matteo D.L. , Maggiore Paolo 
Published: March 2024

Abstract
Due to their high reliability and precision, piston valves are frequently used for pressure regulating applications. Particularly in the aerospace industry, where cryogenic fluids such as liquid hydrogen are frequently used, the design and operation of piston valves become crucial. The current state of advancement of this technology in the cryogenic field is still in its early stages, owing to the difficulties in designing such complex systems in harsh environments. This justifies the need for further in-depth studies and analysis using CFDs tools and predictive models. In order to ensure an optimal and efficient use of a piston pressure regulating valve in cryogenic environment, it is necessary to understand the strengths and limitations of this technology in an extreme thermal and mechanical condition. The presented work concentrates therefore on a preliminary analysis and optimization of a piston valve operating in liquid hydrogen flow field, for pressure regulating applications. Particular focus will be dedicated to the overall dynamics of the main body of the piston, in terms of robustness and controllability of the desired response of the system. The dynamics of the piston within an extremely low-viscous flow, as well as the thermodynamic and fluid dynamic aspects of the valve system, will be discussed. Simulations of the flow field will be performed through CFD tool, crossing the results with the dynamics of the simulated system response through and implemented Simulink model. The obtained results will be then critically analysed in order to suggest possible optimization of the valve in the locations where the system is most affected from a thermal and mechanical standpoint.
Vee-Tail Preliminary Design Methodology for Class I mini- UAV
Authors: Nikolaou Eleftherios , Kostopoulos Vassilis 
Published: March 2024

Abstract
Unmanned Air Vehicles (UAVs) are becoming increasingly popular and widely used in a variety of industries. They can be used for tasks such as agriculture, construction, delivery, surveillance, rescue operations, mapping, wildlife tracking and many more. With the advancements in technology, UAVs are becoming more autonomous and able to perform tasks with minimal human intervention, so are widely used for military and law enforcement purposes. V-tail configurations are commonly used on UAVs due to their advantages in control and stability performance, as well as their ability to reduce drag and improve overall efficiency. However, research on V-tail design and sizing is limited, particularly for Class I mini-UAVs. The objective of this paper is to identify a methodology for a V-tail sizing of a Class I Mini UAV (NATO classification), which refers to the Conceptual and Preliminary Design of the UAV. The methodology will follow the design of a V-tail from the characteristics of the conventional tail of the UAV. Once the characteristics of the conventional tail were extracted, V-tail geometric characteristics (reference area, aspect ratio, mean aerodynamic chord, tail span, dihedral angle), were computed. Therefore, the aerodynamic characteristics of the V-tail have to be extracted, first as an isolated tail, and then as an installed tail. The stability derivatives of the V-tail are then calculated. The methodology for the analytical aerodynamic characteristics and stability derivatives, is a combination of NACA Report No.823 and Marcello R. Napolitano methodologies. Paul E. Purser and John P. Campbell provide design methods for V-tail on a NACA report, which include some of the desired stability derivatives. The rest of them will be calculated with Napolitano’s method. Marcello R. Napolitano gives a methodology for conventional tail sizing; thus, the equations of its methodology have to convert for a V-tail configuration. Furthermore, the aerodynamic characteristics and stability derivatives of the designed V-tail will be verified by Low Fidelity Aerodynamics simulation (XFLR5 software), and then by High Fidelity Aerodynamics by means of CFD. The results between low fidelity analytical values and High-Fidelity Aerodynamics values indicate a relative error lower than 20%.
L1
adaptive controller design for a tail fin controlled fixed wing unmanned aerial vehicle
Authors: Demirli Alican , Koç İlker Murat , Kürkçü Burak 
Published: March 2024

Abstract
The aim of this study is to design L1
adaptive controller, which is one of the robust control methods that can overcome model uncertainties, disturbances and noises, for a fixed-wing unmanned aerial vehicle (UAV) with tail fin controlled. In this context, first of all, the decoupled equations of motion of the six-degrees-of-freedom system are derived for the roll, pitch and yaw channels of the UAV. Then, the performance of the controller is demonstrated by simulation results for linearized system representation. By adding parameter errors to the system in question, the feature of tracking the given angle commands are analyzed. It has been observed that the L1
adaptive control structure exhibits rapid adaptation even in presence of system uncertainties. Finally, the controller is applied to the nonlinear system and operated throughout the entire flight envelope.