bluuebunny/crossref_metadata_2025_split huggingface dataset:
Particle Number Measurement and Its Numerical Simulation of the Airborne Particle Counter by ‘Post-Collection-Check’
Authors: Gao Z L , Zeng G L , Cheng Q D , Wang R J , Zhang W H , Wang F Q , Chen J , Wu J P , Guo J 
Published: August 2022

Abstract
The measurement results of the light-scattering airborne particle counter can effectively evaluate the concentration of airborne particles in the clean environment and confined space, and the accuracy improvement of the calibration measurement results has attracted more and more attention. This paper introduces the ‘post-collection-check’ way of the airborne particle concentration measurement method of the OPC (Optical Particle Counter), based on FESEM (Field Emission Scanning Electron Microscopy) and AAO (Anodic Aluminum Oxide) template, the probability distribution of the collected PSL (Polystyrene Latex) particles on the surface of AAO template, and the pressure parameters of AAO template under the different particle over current areas are both simulated. The numerical simulation results will help to improve the accuracy of the inference statistics of the collected PSL particle number on the membrane filter, and to give guidance on the optimal design of the PSL particle collection tube and the membrane filter, in order to provide an important reference for further improving the OPC particle concentration calibration and traceability method based on statistical theory.
Research on Momentum Parameters of Tailings Dam-break Mortar
Authors: Zhou Hongkang , Liu Yanzhang , Shan Liang , Wang Wenjie , Cao Huabing 
Published: August 2022

Abstract
The tailings dam-break mortar with high potential energy will cause impact damage to the downstream buildings, and the momentum parameters of mortar can effectively reflect its impact on buildings. Taking the distribution status of downstream geomorphology and production and living facilities of Yangjiawan tailing pond as the calculation background, Numbering 4 sensitive analysis points from 1 to 4 in line with the distance between the key protected structures and the breach of the tailing pond from the near to the distant, The three-dimensional fluid simulation software FLOW 3D was used to simulate the evolution process of dam-break mortar under the full-break condition of the accumulation dam above the initial dam, and the variation characteristics of the flow mortar momentum at the key protection structures in the evolution process were analyzed. The results show that the momentum of dam-break mortar at the sensitive points decreases from the near to the distant, Compared with instantaneous momentum, cumulative momentum could reflect the cumulative impact effect of mortar on buildings, and the distinction of impact effect was more obvious.; The peak inundation depth of dam-break mortar at each sensitive point was 1, 3, 2 and 4 sensitive points in descending order, the momentum and submergence depth were inconsistent, The momentum could clearly distinguish the difference of mortar impact effect, and the research results could provide some reference for dam - breaking mortar disaster assessment of tailing pond
Efficient Shock Capturing Based on Parallel Adaptive Mesh Refinement Framework
Authors: Li Weihao , Xia Jian 
Published: August 2022

Abstract
Based on AMReX, a software framework for massively parallel, block-structured adaptive mesh refinement (AMR) applications and in combination with finite difference weighted essential non-oscillatory (WENO) method, a numerical procedure is developed to provide universal discontinuity capturing capability for inviscid, compressible flow. Test cases of one-dimensional and two-dimensional flows containing shock waves, contact discontinuities, flow instabilities, and their interactions are considered to validate the high resolution of AMR for characteristic flow structure under unsteady conditions. The current elaborate AMR-based code is proven to have superior efficiency relative to global refinement via experiments including different initial mesh intervals, refinement ratios at all levels, and. Evidence in executions with multiple processes and domain division sizes indicates its high parallel scalability. Thus, the application built on AMReX is promising for simulations of phenomena undergoing rapid local variation such as compressible turbulence and multiphase interactions.
Study on Impeller Configuration Strategy of Dredger Pump with Different Conveying Distance
Authors: Zhuang Haifei , Liu Mingming , Wu Yongding 
Published: August 2022

Abstract
For DN850 dredge pumps of 3,500 m3/h series cutter suction dredger, on the premise of not changing the impeller size, by changing the parameters of impeller blade to reduce the head of dredge pump, special new impellers for inboard pump and submerged pump are designed; The flow field of the dredge pump is analyzed by numerical simulation. There is no vortex in the impeller channel and near volute tongue, which indicates that the hydraulic performance is excellent; At the flow rate of 10,000 m3/h, compared with the original impeller, the head of the two pumps in series with new impellers is reduced by 23 m, and the efficiency is close to that before modification, reaching more than 85%; This paper analyzes the matching between the dredger pump and the pipeline under three kinds of common sandy mud. By comparing the unit power consumption and productivity, it obtains the suitable conveying distance range of special new impellers of dredger pumps, and forms the impeller configuration scheme of 3,500 m3/h series cutter suction dredger with different conveying distance, which provides guidance for dredging engineering.
Damage Characteristics of Roadway Wall under the Impact of Gas Explosion
Authors: Jia Zhenzhen , Li Shujuan , Ye Qing , Ding Wenxue , Teng Yangzhou 
Published: August 2022

Abstract
In order to explore the damage process and characteristics of roadway wall under the impact of gas explosion, in this paper, the numerical model of gas explosion in roadway is established, and the explosion impact response of roadway wall and the stress change of gas explosion in roadway wall are analyzed. The results show that the impact produced by gas explosion is repeatedly reflected and superimposed on the wall, resulting in the high peak overpressure and duration growth in the explosion load process formed in the roadway. The shock wave propagation of gas explosion in wall is dynamic, and will produce tensile stress and compressive stress, causing damage to the interior of the wall. It will drive the wall structure of adjacent areas to move along the action direction of explosion load, resulting in the overall instability and damage of roadway wall structure. The research results can provide reference for gas explosion disaster prevention and explosion accident identification.
Optimization of Brayton Cycle CO2-Based Mixed Working Medium for Marine Low-Speed Diesel Engine Flue Gas Waste Heat Recovery
Authors: Xie Liangtao , Yang Jianguo 
Published: August 2022

Abstract
In this paper, the S-CO2 recompression Brayton cycle system of Marine Low-speed diesel engine flue gas waste heat recovery is built. By analyzing the physical characteristics of working medium and the law of the influence on the efficiency, five kinds of CO2-based mixed working medium are selected to optimize the CO2-based mixed working medium for Marine Low-speed diesel engine flue gas waste heat recovery from the aspects of total recovery energy, net recovery work and efficiency. The results show that the net recovery work of CO2-based mixed working medium supplemented with 20.11% propane increases by 17.02kW compared with that of pure CO2. The circulating efficiency of CO2 based mixed medium with 32.03% propane is increased by 5.42%.
Singularly Perturbed Solution of Non-Fourier Temperature Field with Mixed Boundary Value Dual-Phase Delay with Thermal Conductivity Jumps
Authors: Bao Liping , Jiang Yanan , Wu Liqun 
Published: August 2022

Abstract
Based on the properties of laminates, a class of nonlinear singularly perturbed mixture equations with discontinuous coefficients over bounded domains is constructed by using a dual-phase delayed heat conduction model. First, the singular perturbation expansion method is used, combined with the corresponding boundary conditions, the partial differential equation method and the Laplace transform method are used to obtain the external solution, the boundary layer, and the corner layer. Secondly, the time-varying temperature field at the discontinuity is obtained, which leads to the asymptotic expansion of the solution. Finally, the consistent validity of the asymptotic solution is obtained through residual estimation.
Numerical Study on Gas Blown in Tundish Side Walls
Authors: Zhou Feng , Huang Yonglin , Niu Hexuan , Geng Mengjiao , Wang Tianyang , Li Yuqian , Zhang Binshan , Chen Chao 
Published: August 2022

Abstract
The performance of gas blown in side walls of a single strand tundish is numerically simulated. Three cases are studied, i.e. tundish without gas blown, tundish with gas blown from the right side wall, and from the front wall. The vortex circulating flow is the main flow structure in tundish without gas blown. The gas blown from the right side wall of tundish will significantly change the flow field. The short-circuit flow that the tracer flow along the bottom of tundish to the outlet is becoming the main flow pattern. The RTD curve shows a rapid increase tendency. An anticlockwise flow near the top surface is formed. The mixing of tracer in the tundish is delayed and the dead volume fraction is increased when compared with the tundish without gas blown case. In contrast, the gas blown from the front wall of tundish will divide the tundish into two parts. The strong circulation flow in two parts is formed. Besides, the mixing of tracer is faster and the dead volume fraction is lower than that of the case without gas blown. This case may be an optimized gas blown technology in tundish.
Study on the Mechanism and Kinetics of O3/H2O2 Advanced Oxidation Reaction
Authors: Feng Leilei 
Published: August 2022

Abstract
With the advent of the era of Industry 4.0, the composition of industrial wastewater is complex and toxic, and at the same time, the country and people have higher and higher requirements for the environment, making water pollution prevention and control a lot of attention. The article systematically expounds the reaction mechanism of O3 single oxidation and O3/H2O2 advanced oxidation process, analyzes the superiority of O3/H2O2 process compared with O3 single oxidation, and experimentally explores the effect of O3/H2O2 process on DDNP production wastewater. The orthogonal experiment results show that the primary and secondary relationship of the influencing factors of O3/H2O2 process is pH>reaction time>O3 concentration>H2O2 dosage, the optimal process is pH=9, reaction time 30min, O3 concentration 8.64mg/L, H2O2 dosage 2ml/L, the effluent after treatment reaches the industrial discharge standard. By increasing the acidity and inhibiting the reaction of OH radicals under the condition of pH 3, the reaction order of the characteristic pollutants (nitrophenols) in the direct oxidation of O3 was determined to be first-order, and the rate constant was 0.148 L/moL·min.
Analysis of Pavement Performance for Nano-CaCO3/SBS Modified Asphalt Mixture
Authors: Sun Pei , Zhang Ke , Xiao Yun , Liang Zijun 
Published: August 2022

Abstract
In order to improve the technical properties of SBS modified asphalt, firstly, nano-CaCO3/SBS modified asphalt with nano-CaCO3 dosage of 1%, 2%, 3%, 4%, 5% and 6% were prepared, while the optimal nano-CaCO3 dosage was optimized by conventional laboratory experiments. Secondly, the pavement performance of SBS modified asphalt mixture and nano-CaCO3/SBS modified asphalt mixture was analyzed by relevant laboratory tests. The experimental results show that nano-CaCO3/SBS modified asphalt achieves the best performance when nano-CaCO3 dosage is 4%. Compared with SBS modified asphalt mixture, the high-temperature performance, water stability, indirect tensile strength and fatigue resistance of nano-CaCO3/SBS modified asphalt mixture are improved obviously, and the crack resistance at low-temperature is slightly decreased, but it still far meets the specification requirement. This indicates that it is possible to enhance the property of SBS modified asphalt and the performance of mixture by adding nano-CaCO3.
The Use of Slag and Red Mud for the Synthesis of a Slag-Based Cementitious Material
Authors: Quan Hong , Yu Huijuan , Lv Dongpeng , Li Yuancheng 
Published: August 2022

Abstract
A large amount of metallurgical slag storage occupies land and wastes a lot of resources. Therefore, this study uses slag and red mud (RM) as the main raw materials, sodium silicate, and sodium hydroxide (NaOH) as the composite alkaline activators, the slag-based cementitious materials were prepared by the secondary mixed grinding method. The mechanical properties of the cementitious materials were characterized and analyzed. The results show that when the ratio of slag to RM in the cementing material is 8:2, the strength increases initially and then decreases with the increase of the content of the alkaline activator. Meanwhile, the content of the alkaline activator is 10% (mass fraction), and the 28-day compressive strength of the sample is up to 67.8MPa, which meets the requirements of slag cement with a 42.5 strength grade.
Parametric Analysis of the Static Behavior for Stainless-Steel Beam-Column Connections
Authors: Qiao Xueliang , Wang Yuanqing , Jia Lianguang , Zhang Tianxiong , Qiao Guangyu 
Published: August 2022

Abstract
To study the influence of geometric parameters on flexural capacity and stiffness of beam-column connections using stain-steel S31608 and get the key influence parameters, on the basis of test data, using the finite element analysis software ABAQUS, parameter analysis on three main geometrical parameters of flexural capacity and stiffness of stain-steel beam-column connections was conducted. The analysis results show that when flange thickness of I-shaped bars increases, bearing capacity and initial stiffness of the joints increase with large amplitude; when slipping coefficient increases, bearing capacity and initial stiffness of the joints increase with small amplitude; when weld ac-cess hole changes, bearing capacity increases and initial stiffness increase with small amplitude, but can decrease stress concentrate phenomenon; when “Dog-bone” is used, the position of plastic hinge appearance will out-shift, but bearing capacity and initial stiffness decrease with large amplitude. Using the weld access hole of FEME350 and increasing the flange thickness of I-shaped bars is a good way to improve the static behavior of stain-steel beam-column connections.
Liquid-Infused Surfaces with Anti-Corrosion on Magnesium Alloy
Authors: Cai Qianqian , Xu Jinkai , Lian Zhongxu , Yu Huadong , Li Jian 
Published: August 2022

Abstract
The poor corrosion resistance of magnesium alloy has become the main reason restricting its application. In this paper, the layered double hydroxide (LDH) with good compactness was prepared on the surface of magnesium alloy by one-step hydrothermal method. The film thickness was 13 μm. The surface was injected with silicone oil to prepare the Liquid-infused surfaces (LIS). Electrochemical test studies show that the LIS has good corrosion resistance, and the lubricant and LDH on the surface can provide a double lasting physical barrier for magnesium alloy materials, effectively isolating chloride ions from corrosion to magnesium alloy substrates. In addition, the LIS is hydrophobic, which can reduce the contact area (CA) between the NaCl solution and the surface, and further improve the corrosion resistance of the magnesium alloy surface.
Effect and Mechanism of Ca2+ on the Corrosion of Hot-Rolled Strip in Turbid Ring Water Containing Cl− and SO2-
4
Authors: Xue J W , Yu W , Chen Y L 
Published: August 2022

Abstract
After the hot-rolled strip is cooled by laminar flow, Cl−, SO2-
4 and Ca2+ in turbid ring water will remain on the surface of the steel plate, which makes the steel plate corrode during storage in a humid environment. In order to clarify the effect and mechanism of residual Ca2+ on the corrosion of strip, simulations were carried out by setting different Ca2+ concentrations in solutions containing Cl− and SO2-
4 with different times of alternate immersion. Through the analyses of corrosion pit morphology, corrosion rate, electrochemical characteristics and corrosion products, it was found that the corrosion rate increased first and then decreased regardless of the Ca2+ concentration. When the Ca2+ concentration is 50~300 mg/L, the increase of Ca2+ concentration will increase the adsorption rate of the matrix and increase the corrosion pits. In addition, the corrosion rate decreases, the depth of corrosion pit becomes shallow and the polarization resistance increases due to the inhibition of the calcium salt layer, and the increase of Ca2+ concentration will enhance the inhibition of corrosion. When the Ca2+ concentration is 1000 mg/L, the denseness of the calcium salt layer is easily destroyed and the corrosion is intensified due to the large amount of adsorption of ions by the matrix.
Optimization of Ultrasonic-Assisted Aqueous Two-Phase Extraction of Flavonoids from Hawthorn Leaves Using Response Surface Methodology
Authors: Liang Junsong , Zhang Hao , Zhu Chuanhe 
Published: August 2022

Abstract
In this paper, using hawthorn leaves as raw materials, the effect of extracting total flavonoids from hawthorn leaves by aqueous two-phase system (ATPS) combined with ultrasonic assisted was studied. Through single factor test and response surface method Box-Behnken design (response surface method, BBD), according to the regression equation, the optimal process conditions were obtained as follows: the ratio of solid to liquid 1:37, ultrasonic time 40 min, ultrasonic power 360 w, ultrasonic temperature 65°C, and the yield of flavonoids was 2.869±0.0004%. This study shows that ultrasound combined with aqueous two-phase system (ATPS) is an effective method to extract total flavonoids from hawthorn leaves.
Influence of Abrasive Hardness on Chemical Mechanical Polishing of 304 Stainless Steel
Authors: Cao Xiaojun , Xue Mingpu , Qi Zhichao , Li Zhongtang , Su Jianxiu 
Published: August 2022

Abstract
In order to improve the quality in chemical mechanical polishing (CMP) of stainless steel and the material removal rate (MRR), 6 kinds of abrasives were used to do the CMP test of 304 stainless steel. In this paper, the 6 kinds of abrasives have different hardness. The experimental results show that, in the CMP process, the MRR increases with the increase of the abrasive hardness, the surface roughness decreases firstly and then raises with the increase of the abrasive hardness. This surface roughness reduces the lowest value when the chromium oxide (CrO) abrasive is used. With low-hardness copper oxide abrasives and magnesium oxide abrasives, it can only remove partial scratches on the surface during the polishing process and obtained low MRR and poor surface quality. Silica abrasives were easy to condense in the polishing slurry and the Gelation hindered the cutting action of abrasive, So resulting in low MRR and poor surface quality. The chromium oxide and white corundum, their hardness are close to the stainless steel, can remove the surface oxide layer of the sample while not produce the damage of the workpiece surface, so the surface quality was very well. Considering that chromium oxide contains Cr2+, it will pollute the environment. Therefore, in comprehensive consideration of the surface quality and MRR, take the white corundum as an abrasive in the CMP of 304 stainless steel.
Aerodynamic Characteristics of Supersonic Separator for Natural Gas Processing
Authors: Wang Chong , Li Yizhen , Zheng Mengqi , Wang Ke 
Published: August 2022

Abstract
Natural gas is a key energy source to achieve the carbon peaking and carbon neutrality goals in China. Dehydration and de-hydrocarbon process is crucial for pipeline transportation of natural gas since water and hydrocarbons in the natural gas would condense to cause corrosion and freeze-blockage in the pipeline. The supersonic separator is innovative low-temperature separation equipment characterized by a simpler equipment structure and higher refrigeration efficiency than the traditional device. In this paper, the numerical analysis is employed to predict the performance of the supersonic separator. The results show that this separator can reach an advanced level compared with others. The separator cannot start-up as the inlet-outlet pressure ratio is lower than1.29, and the minimum pressure ratio needed for normal work is 1.39. Under normal operating conditions, total pressure loss is about 25.4%, the minimum temperature is about 213K, and the mean rotation speed is about 170m/s.
Emergency Vehicle Intelligent Distribution System
Authors: Wang Yongxue , Xia Kaiwen , Yang Yanxiong , Xie Wu , Miao Qunfeng , Liu Tao 
Published: August 2022

Abstract
In this study, we developed a vehicle allocation model that can meet the requirements and cost best, the data related to the number of calls in each zone, and the variability required to respond to different types of calls. First, several indicators are extracted to quantify the advantages of station construction in each zone, and the hierarchical analysis method and TOPSIS are used to score each zone, and then select the stations that need to be built according to the score. Subsequently, according to the call requirements of each zone, its distance from the site, the amount of resources owned, etc, we develop a vehicle allocation model based on integer programming.
Complexity of the Operation Graphs on Cycle and Complete Graph
Authors: Wu Yalong , Ren Haizhen 
Published: August 2022

Abstract
The number of spanning trees (or complexity) of a graph can be used to measure the reliabilities of network and circuit design. Although many NP hard problems are related to the complexity of graphs, there are explicit formulas for the complexity of some specific graph classes. This paper mainly studies the explicit expression of the complexity of graphs obtained by graph operations. Through classical graph operations, we obtain some operation graphs generated by cycle and complete graph, and get the closed formulas for the complexity in these operation graphs. Compared with Daoud’s results, we obtain some interesting algebraic properties about the complexity of operation graphs.
Multi-step Time Series Forecasting Based on Informer-XGBoost-GA
Authors: Sun Chen , Chen Zhibin , Qin Yishuang , Wang Bebe 
Published: August 2022

Abstract
Multi-step prediction of time series has great significance in practical application. To improve the accurate prediction of multistep time series, time series prediction models have good long-time dependence and are able to analyze the correlation between information in time series. In this paper, a multi-step prediction model on the basis of Informer-XGBoost-GA was proposed, first establishing a combination of Informer and XGBoost, and then optimizing the weight of the combined model through GA. By comparing the experimental results, it can be seen that the proposed that the proposed prediction model significantly outperforms the comparison model and raise the accuracy of the prediction with advantage.