bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the influence of artillery recoil on the lateral stability of patrol boat
Authors: Zheng Xiaolong , Jiao Jun , Li Chenghua 
Published: December 2022

Abstract
To solve the problem of lateral instability of a high-speed law enforcement patrol boat caused by the recoil of artillery fire, this paper adopts the method based on EFD (Experiment Fluid Dynamics), the dynamic stability of a high-speed patrol boat model under the impact of an external force is simulated by a percussive test. First, the model of the patrol boat is tested by dragging on the surface of still water, and then the percussive test is carried out with different centers of gravity height, different external impulses, and different speeds, the influence of the above factors on the transverse stability of patrol boat is studied. The results show that the higher the height of the center of gravity, the higher the external impulse and the lower the speed, the worse the transverse stability of the model will be. The results show that the EFD method is feasible, which is of great significance to the shape optimization design of high-speed craft and the selection of artillery systems.
An Optimization of COVID-19 Vaccine Distribution in Canada Based on the VRP Model
Authors: Yuan Ruoxi 
Published: December 2022

Abstract
SARS-Cov-2, or COVID-19, is a new emergent human-transmitting disease, which has caused a worldwide pandemic crisis affecting every aspect of our life. With the latest medical enhancements, vaccines from numerous medical companies (Pfizer, Moderna, Sinovac, etc.) have been proven effective in controlling the hospitalization and deaths caused by COVID-19. Cold-chain transportation of vaccines is a crucial part of providing vaccination. The standard procedure is to store vaccines at low temperatures, around 2°C to 8°C, during any time of transportation. However, due to the uncertainty in this process, a well-developed, monitored cold-chain logistics network is demanded. This paper explores the optimization of the contributing factors, involving data analysis and applied mathematical models, focusing on a case study of the Ontario, Canada area. The simulated results provide a general concept and indication for the administrators and regulators to design and achieve a suitable and fair distribution of vaccines.
A Prediction Method of Ship Traffic Accidents Based on Grey GM(1,1) Model
Authors: Wang Ze , Xu Shiyuan 
Published: December 2022

Abstract
In order to improve the inaccuracy of the GM(1,1) model in the prediction of ship traffic accidents caused by large data fluctuations, a weighted average weakening buffer operator is applied to the GM(1,1) residual error correction model to improve the prediction accuracy. This method is based on the modeling principle of the GM(1,1) residual error correction model. Firstly, GM(1,1) model is established based on the original data sequence to obtain the simulated value, predicted value, and residual tail sequence. Then, the residual tail sequence of the oscillation fluctuation is processed by positive value and weighted average weakening buffer operator, so as to establish the residual GM(1,1) model and correct the original prediction value with the residual prediction value; Finally, this method is applied to the prediction of British merchant shipping traffic accidents to verify its effectiveness. The results show that this method has high prediction accuracy in the short-term prediction of ship traffic accidents.
The Prediction Model of IPIX Radar Sea Clutter Based on SSA-ELM Neural Network
Authors: Zhou Ke , Xi Caiping , Yang Yunfan 
Published: December 2022

Abstract
The prerequisite for improving radar detection capability is to reduction of sea clutter from interfering with the target, and the accurate prediction of sea clutter is an essential prerequisite for effective suppression. To achieve an accurate prediction of sea clutter, a model for sea clutter prediction combination of the salp’s swarm algorithm, prediction using extreme learning machine after performing parameter search, which improves the prediction performance of ELM and backpropagation (BP) neural network. The convergence speed and accuracy are improved, and the overall prediction The IPIX radar sea clutter prediction reaches an accuracy of more than 99% and the prediction results of this model are better than that when only using ELM or BP neural network prediction.
Thermal Rectification in the Coaxial Carbon Nanotube@boron Nitride Nanotube Composite
Authors: Huang Haibo , Huang Xiaohua , Meng Xianguo , Cheng Zaijun 
Published: December 2022

Abstract
To control and utilize thermal energy more precisely, an asymmetric thermal rectifier is designed in this paper. Through molecular dynamics calculations, it is found that the device has obvious thermal rectification phenomenon. The equivalent thermal conductivity of the device increases gradually with temperature. The thermal rectification coefficients at different temperatures are calculated, and it is found that the thermal rectification coefficients fluctuated wildly with temperature. The temperature distribution map inside the device and the fact that the thermal conductivity of the device increases with temperature indicate that the asymmetry of radial heat transfer and the interlayer coupling determine this thermal rectification property.
Corrosion of steel materials in four environmental conditions
Authors: Wang Jiayu , Liu Peng , Ren Kaixu , Wang Xin , Xu Shujie 
Published: December 2022

Abstract
The corrosion of metal materials greatly affects the life of the equipment. Focusing on four typical environmental conditions, this paper takes steel material as the research object and analyzes the influence of factors (temperature, humidity, SO2, Cl− and others) on the corrosion rate of steel materials, as well as the weight loss and morphology. The results show that the atmospheric corrosion rate is 5.88-30.78 μm/A, and increases by 185% on average with the increase of Cl− concentration under road salt conditions. The static and dynamic corrosion rates show a three-step distribution. The concentration of chemical media in the liquid film accumulates, and the synergistic corrosion of multiple factors makes the corrosion rate much higher than the atmospheric corrosion intensity. The maximum corrosion rate under the static condition is the low latitude coastal condition (386 μm/a), and the dynamic working condition is the high latitude coastal working condition (85.6 μm/a).
The Performance and Application of High-temperature Functional Coatings
Authors: Yang Junhua , Wang Wei , Lu Yang , Zhu Lizhi , Yang Chunxia , Wang Qiang 
Published: December 2022

Abstract
A radar component is made of high-temperature-resistant composite materials. For long-term use at a temperature of 200°C, and to withstand certain temperature impacts, it should have a dielectric constant that is not greater than 3.5 at a certain frequency, a dielectric loss not greater than 0.03, an emissivity not greater than 0.085, and a thickness of no more than 0.15 mm. Aiming at the requirements, the properties of three kinds of organosilicon-modified coating systems were studied, and the optimal coating system that meets the needs of radar are selected. According to the actual situation of the component and the characteristics of the selected coating system, the construction process of the rapid volatilization coating was completed. The coating has effectively resisted the high-temperature effect and played a functional role, providing reliable technical support for the development of the radar.
Effect of Single and Double Pulse MIG Welding Process Parameters on Microstructure and Properties of Aluminium Alloy
Authors: Li Lin , Cao Yuhua , Fen Tiantian , Lv Chang 
Published: December 2022

Abstract
Lightweight aluminium alloys are widely used in many industries due to their advantageous mechanical properties. As welding is a popular method for joining aluminium alloy sheets, it is important to understand how the welding process affects the alloy’s performance. Here, we investigated the influence of various operating parameters during pulsed metal inert gas (MIG) welding of thin aluminium alloy plates on the input energy and metallurgical microstructure of the weld. A series of welding tests were performed using surface welding of AA6061 aluminium alloy plates under conditions of a single strong-pulse, single weak-pulse, or double pulse. The morphology, metallurgical structure, and hardness of the welds produced using the different welding parameters were then examined. We observed that increasing the welding speed and the arc duration of low-energy pulses can reduce the heat input. Lower heat input is advantageous as it results in a higher cooling rate of the welding pool and a smaller average grain size of the weld structure. In addition, increasing the welding speed increased the hardness of the weld. Double pulsed MIG welding showed the best overall weld performance and is recommended for improving the quality of aluminium alloy bonding.
Preparation and Properties of Trivalent Chromium/Zirconate Composite Conversion Coating on Al-50%Si Alloy
Authors: Wu Liqun , Guo Ruiguang , Yin Shihua 
Published: December 2022

AbstractAl-50%Si alloy is a mainstream electronic packaging material. In order to solve the problem of high corrosion resistance on the surface of Al-50%Si alloy and reduce environmental pollution, a trivalent chromium/zirconium salt composite conversion coating was developed for the package shell without acid-base washing and spraying. The appearance, surface morphology, composition, and corrosion resistance of the conversion coating were characterized and analyzed by visual inspection, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and neutral salt spray test. The results show that the prepared trivalent chromium/zirconium salt composite conversion coating is composed of amorphous particles. After treatment, the content of Zr element on the surface of Al-50%Si alloy increases to 3.63%, Cr element increases to 0.82%, and oxygen content increases to 9.21%; after 168 hours of neutral salt spray test, there is no obvious corrosion on the surface of the conversion coating.
Study on environmental corrosion performance of hot dip galvanizing coating
Authors: Liu Hongyu , Liu Jianing , Fu Jia , Zhao Jian , Sun Zhonghua , Huang Weichang , Su Yunhai 
Published: December 2022

Abstract
In order to analyze the influence of environmental factors on the corrosion resistance of hot-dip galvanized coating, a naturally clean environment and thermal shock treatment were used to simulate the service conditions of products. The surface state and zinc layer thickness of hot-dip galvanized coating under two process conditions were detected. Salt spray corrosion and electrochemical corrosion tests were carried out on hot-dip galvanized coatings. The phase and microstructure of the coating were analyzed by XRD, OM, and SEM. The results show that the hot-dip galvanized coating has a good corrosion protection effect in a naturally clean environment. After thermal shock treatment, cracks in the coating are more likely to occur. With the increase of thermal shock time, the depth of crack on the surface of the coating increases, so the corrosion protection effect of the coating decreases obviously. For the thermal shock treatment of 10-30 days, the coating performance enters the corrosion stability period, and the thickness decreases very little, but when the time exceeds 30 days, the corrosion of the coating accelerates sharply. Electrochemical corrosion shows that the hot-dip galvanized coating has typical coating protection double capacitive reactance curve, and the polar protection effect is good. When the thermal shock treatment time is 30 days, the dense oxide on the coating surface has the best protection effect against corrosion. At this time, the self corrosion current is the smallest and the impedance radius is the largest. When the thermal shock treatment time exceeds 40 days, the cracks on the coating surface will expand to the substrate, and the corrosion protection effect of the coating may fail. So, the corrosion protection effect of hot-dip galvanized coating is limited in the current situation of frequent extreme environments and intensified environmental pollution.
Janus MoSSe monolayer coordinated single B atom as an efficient catalyst for nitrogen reduction to ammonia
Authors: Yuan Saifei , Ren Hao , Zhu Houyu , Guo Wenyue 
Published: December 2022

Abstract
Electrochemical nitrogen fixation under ambient conditions is an energy-saving and environmental-friendly method alternative to the Haber-Bosch process, but is subjected to efficient electrocatalysts. Through density functional theory (DFT) computations, we systematically investigate the NRR performance of single B atom substitution S and Se atom in the Janus MoSSe monolayer (BSMoSSe and BSeMoSSe) as a single atom catalyst (SAC). The results show that BSMoSSe and BSeMoSSe are promising catalysts with a low energy barrier of 0.10 eV and 0.27 eV and excellent NRR selectivity. Charge density differences confirmed the N2 activation mechanism of acceptance-donation between B and adsorbed N2. These findings bring a new strategy for NH3 production by BSMoSSe and BSeMoSSe electrocatalysts under ambient conditions.
Research on behavior mechanism and performance of concrete shrinkage reducing agent
Authors: Lin Yanmei 
Published: December 2022

Abstract
The research on the function and mechanism of shrinkage reducing agent shows that shrinkage reducing agents can greatly reduce the shrinkage rate of concrete without adversely affecting the mechanical properties of concrete. The mechanism of the shrinkage-reducing agent was tested and analyzed from the water evaporation rate of the solution and the surface tension of the solution. The results showed that the addition of the shrinkage reducing agent could significantly reduce the surface tension of the aqueous solution, and had little effect on the evaporation rate of the water on the surface of the aqueous solution; the surface tension test shows that the mechanism of shrinkage reducing agent reducing drying shrinkage is mainly to reduce the surface tension of pore solution; the analysis from the water evaporation rate test shows that shrinkage reducing agent has no significant effect on water evaporation inhibition, and inhibiting concrete moisture evaporation is not the most commonly used shrinkage reducing agent reduction mechanism.
Preparation and characterization of La2-xSmxMo1.8Al0.2O8.7 as electrolyte for solid oxide fuel cells
Authors: Tian Changan , Shao Lingbo , Chen Chao , Liu Yang , Wang Cao , Zhu Lejie 
Published: December 2022

Abstract
Solid oxide fuel cells (SOFCs) have been regarded as promising eco-friendly power sources in recent years owing to their high energy conversion efficiency and fuel flexibility. La2Mo2O9-based ceramics draw researchers’ attention due to their good performance as electrolyte materials for SOFCs. In this study, the Sm and Al co-doped La2Mo2O9, La2-xSmxMo1.8Al0.2O8.7 (x=0.1,0.2,0.3 and 04, LSMAO), are successfully synthesized by the sol-gel method as electrolyte materials for SOFCs. The phase evolution, sintering, the microstructural and electrochemical performance of LSMAO were observed by TG-DSC, XRD, SEM, and impedance analyses, respectively. The results show that the highly phase-pure cubic LSMAO nanopowders can be obtained after calcining at 600 °C for 2 h. The as-synthesized LSMAO powders exhibited a better sintering activity. All these samples were found to have a relative density above 94.5% after sintering at 950 °C for 5 h. The electrical performance study shows that higher doping concentrations of Sm caused a decrease in ionic conductivity and an increase in activation energy. La1.9Sm0.1Mo1.8Al0.2O8.7 exhibited the highest oxide ionic conductivity (σ800 °C=0.033 S/cm) and lowest electrical activation energy (Ea=0.85 eV). This shows that LSMAO could be used as a potential electrolyte for intermediate temperature SOFCs (IT-SOFCs).
Study on corrosion fatigue behavior of heavy piece Ti6Al4V titanium EBW joint in artificial seawater
Authors: Wang Chunyan , Zhang Yupeng 
Published: December 2022

Abstract
Titanium alloy has been more and more used in the ocean engineering field. Since the crucial service environment, the corrosion fatigue behavior of the Ti6Al4V alloy EBW joint has been investigated and analyzed. The results show that the grain size of the molten zone decreases gradually from the central line to the base metal symmetrically and the acicular α’ martensite and β phase grain boundaries are the dominating phases of the seam zone. Moreover, the corrosion fatigue crack growth rate of the seam zone was insensitive to the texture of the base metal and crystal orientation of the ti6al4v alloy. It could also be seen that the base metal and the seam zone have different crack growth mechanisms, which is mainly during to the existence of the acicular α‘ martensite in the seam zone and the trend of crack tip energy release. The crack propagation rate of the seam is lower than that of the base metal.
Study on zinc slag defects on surface of pure hot dip galvanized steel sheet
Authors: Ding Xin , Feng Huixiong , Zhao Chuanxiang 
Published: December 2022

Abstract
Hot dip galvanized steel sheet is widely used in the automotive field because of its advantages of low cost, thick hot dip galvanized layer, reducing body defects, improving vehicle performance, and beautifying surface appearance. However, the zinc slag defects on the surface of the steel plate significantly reduce the surface quality of the steel plate. In this paper, the morphology of zinc slag on the surface of a pure hot-dip galvanized steel sheet was analyzed by scanning electron microscope. The results showed that the zinc slag defects on the surface of pure hot-dip galvanized steel strip was round, and the size was large, about 700 um. By adjusting the air knife pressure, the aluminum content in the zinc tank, and the opening of the RCS fan, the number and size of zinc slag defects on the surface of pure hot-dip galvanized steel strip can be significantly reduced. As a result, the steel plate was improved.
Effects of a porous boron nitride nanofiber on nano-mechanical properties in shallow surface of WC-Si3N4 composite
Authors: Cao Ting , Li Xiaoqiang 
Published: December 2022

Abstract
The nanoindentation technique has been applied to materials research for decades, such as WC, Si3N4, and other ceramics or composites. However, nano-mechanical properties in shallow surfaces were often unstable, especially for ceramics-based composites. In this paper, the mechanical properties of WC-10 wt.% Si3N4 without and with the addition of ultrafine porous boron nitride nanofiber were investigated by nanoindentation continuous stiffness measurement in this study. The effects of the porous fiber on elastic modulus and hardness were revealed, which led to more stable and regular profiles of the elastic modulus and hardness versus displacement curves. The curves were cut out and shown before the 30 nm displacement of the tip, which displayed the regularity of the profiles caused by the porous fiber more directly. The values were statistically analyzed at intervals of 10 nm after 30 nm displacement, and then lower standard deviations were observed. The different Si3N4 cracks made from Vickers indentation on the composites were photographed and associated with the regularity of the curves after the fiber addition. It’s considered that the regularity effects on mechanical properties of the porous boron nitride nanofiber on ceramics composites can be helpful in thin film studies, which are also in difficulties of mechanical properties scattering on the nanometer scale using continuous stiffness measurement.
Study on hot deformation behavior of Mg-9Y-1MM-1Zn-0.6Zr alloy
Authors: Feng Lishuai , Ma Minglong , Zhang Kui , Li Yongjun , Li Xinggang , Shi Guoliang , Yuan Jiawei , Sun Zhaoqian 
Published: December 2022

Abstract
Rare earth elements and the LPSO phase play a significant part in the optimal regulation of the comprehensive performance of the Mg-9Y-1MM-1Zn-0.6Zr (WE91B) alloy, but the high strength of the alloy also brings problems such as difficulties in processing deformation. To determine optimal machining parameters suitable for WE91B, the homogenized alloy was investigated in constant temperature and equal rate compression using the Gleeble-3500 thermal simulation measurement instrument, to study the hot deformation behavior of WE91B alloy in the temperature range of 693-783 K, strain rates of 0.001-1s−1 and maximum deformation of 60%. The deformation activation energy was calculated, the constitutive equation of WE91B alloy was constructed, and the processing map of the alloy was established according to the dynamic material model. The results show that the flow stress curves of the alloy exhibit typical dynamic recrystallization characteristics and the flow stress increases significantly with the increase in strain rate and decrease in deformation temperature. The hot deformation activation energy of WE91B alloy is about 331.605 kJ/mol. From the two aspects of processing map and microstructures after plastic deformation, the optimal processing process of WE91B alloy is T = 783 K and έ = 0.05 s−1.
Research on Dynamic Mechanical Properties of Different Silane Coupling Agent In-situ Modified SSBR/Silica Composites
Authors: Wu Xiaohui , Xu Qing , Zheng Tao , Niu Qiqiang , Hou Cong , Shao Hongqi 
Published: December 2022

Abstract
Hydroxyl density of silica surface will reduce and the compatibility of silica with rubber matrix will be improved through the modification of silica by silane coupling agent (SCAs). The silica-silica and silica-rubber interaction of silica filled solution polymerized styrene butadiene rubber (SSBR) in-situ modified by silane coupling agent TESPT and Si747 are studied by Dynamic Mechanical Analyzer (DMA). The effect of different types and loading amounts of SCAs on the dynamic mechanical properties of silica filled SSBR is investigated. The results show that the novel silane coupling agent Si747 has a more apparent effect on lessening the silica network than that of silane coupling agent TESPT, Hysteresis factor (tanδ) measured by DMA reduces, and the heat-built improves. It could also be found that Si747 modified composites have the lowest apparent activation energy, which is used to characterize the filler-rubber interaction, indicating the lowest temperature dependence.
New Two-Dimensional WS2/ZrSi2N4 Heterostructure as photocatalyst for Water Splitting into Hydrogen
Authors: Ma Hao , Guo Wenyue 
Published: December 2022

Abstract
Heterostructure construction is an important strategy for separating photogenerated electron-hole pairs and enhancing optical absorption ability of photocatalysts. In this work, we performed WS2/ZrSi2N4 heterostructure calculations about its structural and electronic properties based on the density functional theory. Our calculations show that BB2-stacking is most stable in all possible stacking configurations of WS2/ZrSi2N4 heterostructure. In addition, the charge transfer route of type-Z scheme is observed for the WS2/ZrSi2N4 heterostructure, which is beneficial for separating the electron-hole pairs and suppressing the carrier recombination. The stronger optical absorption ability of the WS2/ZrSi2N4 heterostructure is maintained compared with individual WS2 and ZrSi2N4 monolayers. These results suggest that the WS2/ZrSi2N4 heterostructure maybe is the potential for photocatalytic water splitting in hydrogen applications.