bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of working fluid on the ORC cycle performance of the ocean thermal energy conversion system
Authors: Zhang Kai , Lv Xiaojing , Weng Yiwu 
Published: March 2024

Abstract
Ocean Thermal Energy Conversion system utilizes shallow seawater as the heat source and deep seawater as the cold source, achieving energy conversion at low temperatures and small temperature differences. To improve the efficiency of the OTEC system, this paper focuses on the working fluid side, based on the closed Organic Rankine Cycle, to analyse and select common low boiling point organic working fluids suitable for the OTEC system. Two of them are combined to form new mixed fluids with different component types and ratios. The impact of different types of mixed fluids on system performance is studied. Results show that M31 mixed working fluid has higher power generation efficiency, lower operation pressure and the best economical. Peak ƞOTEC
is 6.43. Compared with pure fluids, using mixed fluids greatly reduces the power consumption and the frictional resistance loss. The R245fa/R245ca (0.3/0.7) mixed working fluid has the smallest power consumption among all its component allocation ratios, with a deep seawater pump consuming 5.085kW, accounting for only 3.3% of that when using pure R245ca. Compared to pure fluids, mixed fluids have higher net output power. So, M31 can be selected as the most suitable working fluids for OTEC system among M1 to M36.
Numerical investigation of the powered take-off configuration of civil transport using an improved thrust-drag bookkeeping method
Authors: Cui Zheng , Zhang Wensheng , Wang Kai , Cao Yihua 
Published: March 2024

Abstract
This paper offers a detailed examination of the powered nacelle’s effect on take-off configuration of a civil transport. Using computational fluid dynamics (CFD) techniques, we analyzed two specific geometries from the Propulsion Aerodynamics Workshop and High-lift Prediction Workshop, comparing our results with existing experimental data. We incorporated configurations of both the Through-flow Nacelle (TFN) and Power Nacelle (PN) for a comprehensive comparison. Our approach significantly refined the prevailing thrust-drag accounting method. Employing surface flow visualizations and spatial particle trajectories, we highlighted the powered nacelle’s influence on the aircraft flow field. Simulations show that the engine exhaust’s flow acceleration boosts lift and reduces flow separation at high angles of attack. However, power intervention notably increases the overall drag. Specifically, at a 14° angle of attack, power effects raise the drag coefficient of the take-off configuration by 275 counts, resulting in a 0.76 decrease in the lift-to-drag ratio.
Investigation on suitable design parameters for hydrodynamic bearing of LVADs
Authors: Li H Y , Zhang M K , Wu Q Y , Luo X W 
Published: March 2024

Abstract
Left ventricular assist devices (LVADs) are crucial and helpful to support heart function for patients with heart failure. For the LVAD with hydrodynamic bearings, high reliability of the bearing is necessary to support the rotor and achieve the performance of LVADs. This research investigates the effect of various design parameters on the performance of a dislocated hydrodynamic bearing in LVAD based on numerical simulation, where Reynolds equation is solved to simulate the behaviour of the bearing under different design conditions. For the design of hydrodynamic bearing, several parameters are considered, such as wedge number, wedge depth, wrap angle, bearing clearance, length-diameter ratio, etc. The results show the effects of these parameters on friction loss, supporting capability, and so on. The optimal hydrodynamic bearing design is proposed so as to improve the performance of LVADs.
Multi-objective optimization of intake parameters based on response surface methodology
Authors: Fang T , Huang X B , Yu K , Guo Q 
Published: March 2024

Abstract
The open intake is an important hydraulic building in pumping stations. This paper adopts the simple coupled level-set and volume of fluid and bifurcation model for numerical simulation. Based on the response surface methodology (RSM), multi-objective optimization of the structural parameters of the open intake is carried out. Considering the air-entrained vortex and irreversible energy loss of the intake pool, the response surface optimization model of the intake is established. The results verify the accuracy of this model. It is shown that the influence of floor clearance and back-wall clearance on the objective function is significant; After gradient optimization calculation, the optimal parameter combination is C = 0.4172D and B = 0.7208D. This optimization scheme suppressed the air-entrained vortex and other adverse flow patterns. And these results provide relevant theoretical references for the future design of intake.
Analysis of wind power level distribution in drainage corridor under runner return-exhaust condition
Authors: Shu Lingfeng , Long Zhe , Wu Jiawei , Li Chengjun 
Published: March 2024

Abstract
When pumped storage units are operated under return-exhaust conditions, there are areas of high wind speed in the drainage corridor, which seriously threaten the life safety of the operating personnel. In actual operation, accidents such as exhaust pipe breakage and water spraying frequently occur in power stations, which also cause significant property losses. Currently, there is a scarcity of studies on the wind distribution in the drainage corridor for the return exhaust condition, and there is a lack of quantitative knowledge on the design and risk assessment of the range of wind speed safety zones in the region. In this paper, a full-channel unsteady numerical simulation is carried out using the SST turbulence model for the backwater exhaust condition of a pumped storage power station’s dewatering air system, focusing on the wind distribution in the drainage corridor, analyzing and summarizing the specific mechanism of wind distribution. The results show that the main factor determining the wind distribution in the drainage corridor under the backwater exhaust condition is the jet velocity at the outlet of the exhaust main pipe, and the size of the outlet jet velocity is related to the orifice valve, the diameter of the exhaust pipe and the structure of the outlet, which can provide data support for the safe area delineation of the drainage corridor of the dewatering air system and the pre-design of the corridor.
Thermal-hydraulic performance analysis of the supercritical fuel printed circuit heat exchanger with zigzag flow channels
Authors: Wei Yingchuan , Li Xiang , Zhu Jianqin , Cheng Zeyuan , Wei Jiaqi 
Published: March 2024

Abstract
Printed Circuit Heat Exchanger (PCHE), which uses the supercritical fuel RP-3 as the cold fluid and the air as the hot fluid, is considered a promising candidate for CCA (Cooled Cooling Air) system heat exchanger selection due to its high compactness and efficiency. In this paper, the numerical method of the supercritical fuel PCHE with Zigzag channels is established, and an experimental system is designed and built to verify the accuracy of the numerical method. The influence of inlet temperature, mass flow rate, and outlet pressure of the fuel on the thermal-hydraulic performance is numerically investigated. The inlet temperature of fuel is ranged from 100 to 500°C, the mass flow rate of fuel is from 6 to 10g/s, and the outlet pressure of fuel is ranged from 3 to 6MPa. The results demonstrate that the fuel exhibits higher heat transfer coefficients and pressure drop caused by higher mean turbulent kinetic energy as the increase of the inlet temperature and mass flow rate. The flow and heat transfer performance of the fuel does not change significantly with pressure change since its thermophysical properties decrease slightly with increased pressure. The flow and heat transfer correlations for the tested PCHE are proposed with the numerical results. The newly developed Fanning friction factor correlation predicts almost 100% of the numerical data within the ±5% error band, and the newly developed heat transfer correlation predicts 94.4% of the numerical data within the ±10% error band.
Characterizing the hydration process of cement based on synchronous thermal analysis method
Authors: Wu Chuandeng 
Published: March 2024

Abstract
Research on the characterization method of cement hydration progress - synchronous thermal analysis cement hydration progress is closely related to the strength of cement concrete materials. How to intuitively and effectively characterize cement hydration progress has been puzzling by researchers in this field. In this project, the content of various hydration products in the thermal analysis process of cement slurry and its variation law with age were obtained by simultaneous thermal analysis of the benchmark cement and the benchmark cement doped with early strength agent ZQ-1. By comparing the three DTG spectra of cement slurry mixed with early strength agent and blank benchmark cement slurry with maximum thermal weight loss on thermal decomposition, calcium hydroxide of hydration products with peak temperature between 400°C ~ 450°C can better characterize the effect of different admixtures on the hydration process of cement slurry. Early strength admixtures can better promote the early hydration of benchmark cement.
Study on sintering properties of aluminum oxide nano-powder for electronics packaging
Authors: Lin Meihong , Huang Yongliang , Ran Chenxiu , Dong Guangcheng , Zhao Yan 
Published: March 2024

Abstract
The microstructures of two kinds of nano powders (ɑ-Al2O3, γ-Al2O3) are studied using a scanning electron microscope (SEM), X-ray diffraction (XRD) under the customized low-temperature sintering process (under the maximum sintering temperature 1600 °C) for the frame material of the customized ceramic for high power electronics packaging application. The experimental results show that the structure of ɑ-Al2O3 is stable while the structure of γ-Al2O3 is unstable. The crystalline form of γ-Al2O3 is changed to ɑ-Al2O3 under the sintering process. The two kinds of powders are all bonded together with a laminate structure. The sintered samples of the γ-Al2O3 are the most compacted.
Study on the influence of environmentally friendly plasticizers on the properties of polyvinyl chloride
Authors: Wu Hailong , Zhou Biyun , Cen Chuanfu , Cao Yu 
Published: March 2024

Abstract
In this work, the torque rheology, mechanical properties, migration resistance, thermal deformation, and Vicat softening point temperature of PVC plasticized by four environmentally friendly plasticizers are investigated. The experimental results reveal that the plasticizer’s heavy metal content meets production requirements while falling below the limiting standard. Plasticizer melting points differ, as do the enthalpy and torque of the entire melting process, resulting in different energy consumption when melting plasticizers. Also, the mechanical properties of PVC are not different, but the mechanical properties of PVC plasticized by epoxy soybean oil are the most prominent. Besides, the Vicat softening point temperature of PVC plasticized by four environmentally friendly plasticizers is within the normal standard range, and the migration amount in different solvents is changed in a small range, which will not affect human health.
Study on the protective performance of coating system for thermal spraying zinc on radar
Authors: Yang Junhua , Wang Wei , Lu Yang , Zhu Lizhi , Jia Xue , Wang Qiang 
Published: March 2024

Abstract
In response to the harsh marine environment protection needs of radar, the protective performance of 9 types of coating systems for thermal spraying zinc was studied through condensation tests, salt spray tests, and temperature tests. The blistering phenomenon of the radar thermal spraying zinc matching protective coating system was analyzed. The research results showed that the blistering of the thermal spraying zinc matching protective coating system may be related to the pores of the sealing coating. Among the 9 coating systems, the comprehensive performance of B and D coating systems in terms of moisture resistance, salt spray resistance, and temperature stress resistance is significantly superior to other coatings. The radar using B and D coating systems has been successfully applied to various types of harsh marine environments, improving the radar’s protective performance.
Research on antennas based on nanophotonic materials
Authors: Huang Honghua , Che Lidong , Chen Youwei 
Published: March 2024

Abstract
In this study, the performance of bilayer graphene and its dual-frequency reconfigurable antenna structure on SiO2/Si substrates was explored. The research underscores that when compared to traditional radio frequency and microwave antennas, the performance of nano-optical antennas is strongly contingent on their size and shape. It is also intimately related to their intrinsic material properties, highlighting the unique physical attributes and scaling behavior of nano-photonic antennas. A salient feature of bilayer graphene is its ability to dynamically adjust its conductivity by applying an external voltage between the two layers, offering new prospects for its application in micro-nano electronics and photonics. Through a comparative analysis of radiation decay rates and quantum efficiency, it was determined that metallic materials exhibit much higher non-radiative losses than nano-optical materials. This research provides a foundational theoretical framework for future experiments and paves the way for creating secure information networks. However, the study acknowledges the potential challenges in the real-world application and production of nano-photonic antennas, suggesting further exploration in optimizing their structure to enhance efficiency.
Influence of parameter on the characteristics and morphology of Ni60/WC coatings
Authors: Feng Mingjia 
Published: March 2024

Abstract
Due to its unique excellent performance, titanium alloys have a broader set of uses. With the increasing use of titanium alloys, there are also certain problems when used in some special environments, for example, poor wear resistance and oxidation resistance. To address the wear resistance and ensure its application is not limited by conditions, this article uses the laser method to prepare Ni60+35% WC composite coverings on Ti6Al4V alloy using different scanning speeds (8, 12, 14 mm/s). Findings indicated the laser-clad wall coverings at three different speeds achieved strong metallurgical adhesion between the substrates. The phenomenon of mutual diffusion between Ti6Al4V alloy and coating materials was observed, and the coating’s microhardness grew as the scanning speed rose. When compared with the substrate, the surface coating’s anti-wear properties were increased. At 14 mm/s scanning, the covering exhibited the highest durability to wear.
Effect of sintering insulation temperature on the properties and microstructure of alumina-reinforced aluminum matrix composites
Authors: Zou Haiping , Yu Xiaohong , Wu Hongliang 
Published: March 2024

Abstract
Aluminum matrix composites reinforced with particles have garnered significant attention due to the growing need for advanced structural materials. This research utilized nano-Al2O3 powder (30 nm in size) and pure aluminum powder (40 μm in size) as raw materials to fabricate alumina-reinforced aluminum matrix composites through the hot-pressing powder metallurgy sintering method. The raw powders were amalgamated using mechanical ball milling and ultrasonic dispersion. This paper delves into the relative densities, hardness, and other properties of the alumina-reinforced aluminum matrix composites, emphasizing the impact of the sintering insulation temperature on these attributes and microstructures. The result showed that the optimal sintering insulation temperature was identified as 400°C, where the Vickers hardness (HV0.5) peaked at 31.3 HV and the relative density reached a zenith of 0.986. SEM imagery revealed that the white nano-Al2O3 particles were evenly dispersed across the silver-white aluminum matrix, with no evident clumping. Furthermore, the nexus between the nano-Al2O3 particles and the composite matrix was seamless and robust. Such features enhance the composite’s performance. The research underscores the potential of enhancing these composites and posits that alumina-reinforced aluminum matrix composites can be effectively produced using the hot-press powder metallurgy sintering technique.
Preparation of porous nano-magnesium oxide using a corn starch template method
Authors: Chen Hukui , Mu Xiaxia , Jiang Yu , He Zhijun 
Published: March 2024

Abstract
Nano-porous magnesium oxide was prepared using a corn starch template and a magnesium nitrate hexahydrate precursor, and characterized by TGA, XRD, FTIR, EDS, TEM, and BET surface area analysis. The results showed that porous magnesium oxide composed of nano-particles could be obtained using this method. The final magnesium oxide product was in the form of large flakes under low magnification, and the flakes were composed of small nano-scale particles under high magnification. The particle size of nano-porous magnesium oxide was 20–28 nm, the specific surface area was 29.37 m2/g, and the average pore diameter was 19 nm.
Corrosion Assessment of Metals in the Presence of Food Waste Fermentation Solution Through the Experimental Study
Authors: Shi Quan , Wu Xuan , Shen Lin , Li Xueqin 
Published: March 2024

Abstract
This paper describes an experimental study on the corrosion assessment of metals in the food waste fermentation solution. The corrosive degree of metals under different submersion conditions is assessed through the weight loss method. The experimental results indicate that HT200, Q345B, and 45 steel are rapidly corroded (weight loss values over 80, 221 mg/m2 after 192 hours). Although 304 shows a better corrosion-resistant ability, it is slightly corroded (weight loss: 1, 782 mg/m2 after 192 hours) under the interval submersion condition. The food waste treatment facilities, especially pipelines, and bioreactors should avoid iron-based materials.
Design of the Ti-PCL interpenetrating phase composites with the minimal surface for property enhancement of orthopedic implants
Authors: Xie Haiqiong , Chen Junjie , Liu Fei , Luo Tao , Wang Yiru , Tang Yichuan 
Published: March 2024

Abstract
IPCs (interpenetrating phase composites) offer a promising approach to enhancing the mechanical properties of orthopedic implants, including strength, fracture toughness, and the potential for incorporating complex functionalities. In this study, Ti6Al4V-PCL IPCs were fabricated by additive manufacturing and infiltrating melted PCL into a Ti6Al4V scaffold with a minimal surface structure. The IPCs introduction modifies the specimen’s failure mode and improves its energy absorption performance through enhanced two-phase interaction and effective stress transfer. Finite element simulations demonstrate increased stress diffusion, improved energy absorption mechanisms, and a prolonged stress plateau period. Among various scaffold types, the Gyroid IPCs exhibit superior mechanical properties, making them an excellent choice for enhancing the performance and functional development of degradable implantable stents.
Research progress of Fe/Al2O3 interface based on first principles
Authors: Yu Qing , Guo Dong , Deng Xiaohu , Zhao Dongfeng , Meng Shuang 
Published: March 2024

Abstract
Fe-Al alloy has excellent oxidation resistance and has a good application prospect in high-temperature environments. Its oxidation resistance mainly comes from the Al2O3 oxide film on the surface, and the Fe/Al2O3 interface is the weakest link between the oxide film and the substrate. With the development of computational materials science, using first-principles calculations to study the Fe/Al2O3 interface has gradually become a research topic of concern. According to the different construction methods of the Fe/Al2O3 interface, the existing theoretical models of Fe/Al2O3 interface structure are divided into three categories: γ-Fe/α-Al2O3 interface model, α-Fe/α-Al2O3 interface model and other Fe/Al2O3 interface models. Their characteristics are compared and analyzed. The latest research results of Fe/Al2O3 interface optimization measures and strengthening mechanisms are listed, and a summary of how alloying elements affect the ability of Fe/Al2O3 interface bonding is provided. The study of strengthening mechanisms can lead to better design of interfaces for new materials and thus improve material properties.
From spent lithium ion battery to supercapacitors: a green and facile approach for recovering carbon-based anode materials
Authors: Song Shanshan , Deng Danli , Lu Yingjun , Fan Wenjie , Xu Wanli 
Published: March 2024

Abstract
With the rapid development of electric vehicles and boosting lithium-ion battery production, recycling waste lithium-ion batteries has been the focus for researchers all over the world. In this study, carbon material was recovered via forming lithium graphite intercalated compound through charging and followed by high energy ball milling. The recovered carbon sample was then prepared as electrodes for symmetric supercapacitors. Electrochemical tests and material characterizations showed that the recovered carbon has a porous graphene-like sheet structure, and the specific surface area and specific capacitance can be effectively increased to 155 m²/g, which is over 10 times higher than that of the untreated carbon. The maximum specific capacitance of recovered carbon material was 41.66 F/g at a scan rate of 100 mV/s with a voltage range of 0-2V, which is 10 times higher than that of untreated carbon. The green and facile recovery method of batteries proposed in this paper provides a new idea and method for the recycling and utilization of waste lithium-ion battery anode materials.
A handy preparation of Pt-based bulk catalysts for indoor formaldehyde purification
Authors: Xie Junming , Huang Yanting , Tu Shunheng , Deng Kang , Li Yongfeng 
Published: March 2024

Abstract
This paper mainly studies the preparation of Pt-based bulk combustion catalysts using cordierite honeycomb ceramics as the substrate, and chemical plating technology to directly load precious metal Pt on the sensitized and activated ceramics. Formaldehyde was used as the reaction gas for performance testing of the combustion catalytic activity of the catalyst. The XRD and SEM results have shown that the Pt particles were loaded on the face of cordierite. The effect of formaldehyde purification is significantly affected by factors such as the initial concentration of formaldehyde in the closed space, environmental humidity, and catalyst calcination temperature.