bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research progress of self-healing concrete
Authors: Huang Rui 
Published: October 2023

Abstract
The sustainability and durability of infrastructure can be considered in terms of both structure and materials. At present, developed and most developing countries are facing the problem of aging infrastructure. And maintenance will produce high costs and reduce the economic benefits of infrastructure. Self-healing concrete can repair cracks or restore the strength of the structure, extending the service life of infrastructure. For improving the sustainability and durability of infrastructure, the working principle and development of Biological Concrete, Self Healing Fiber Concrete and Core-Shell System Based on Gelatin and Poly(Vinyl Alcohol) (PVA) for Concrete were studied in this paper. One practical application of self-healing concrete in China is analyzed. Finding self-healing concrete is an environmentally reliable way to improve the sustainability and durability of infrastructure.
Extraction and determination methods of phthalates
Authors: Jiang Ruilin 
Published: October 2023

Abstract
Phthalic acid esters (PAEs) are environmental hormone compounds, commonly known as plasticizers. After long-term accumulation, it will lead to deformities, cancer, mutations and other diseases in the human body, which will seriously endanger human health. Due to the increasing attention paid to phthalate pollutants in society, high efficiency, accuracy and no secondary pollution are difficult points in extraction and determination methods. This paper summarizes the research progress of extraction and determination methods of phthalates at home and abroad from 2010 to 2022, mainly summarizes the extraction methods of phthalates in various environments and the methods of chromatography, Measurement methods such as mass spectrometry and spectroscopy. Compared the advantages and disadvantages of several extraction and determination methods, and proposed the prospect of improving extraction and detection methods.
The investigation of the urban heat effect in Beijing
Authors: Lin Peiran 
Published: October 2023

Abstract
With the development of society, environmental problems are getting more and more attention. As the capital of China, Beijing has growth rapidly in recent decades. Since the accelerated development of urbanization, the scale of urban areas in Beijing has been expanding and urban energy consumption has increased, all of which have influenced the heat island distribution pattern of the city. Therefore, it is meaningful to study and investigate the urban heat effect in Beijing. This paper analyses the situation and development of the heat island effect in Beijing, gives the reasons for the generation and intensification of the urban heat effect. Then, the paper highlights the impact of the energy consumption of building air conditioning systems on the urban heat effect, while citing some methods and technologies that can reduce the energy consumption of building air conditioning. It reflects the importance of reducing the energy consumption of air conditioning systems to mitigate the heat island effect.
Numerical Study on the Flow Field Characteristics and Efficiency of Different Underwater Gun Muzzle Brakes
Authors: Sun Zhiqun , Li Qiang , Han Yujing , Qu Pu , Lu Lin 
Published: October 2023

Abstract
The submerged gun’s mathematical and physical models were established, and an investigation was conducted on the development of the flow field and the recoiling efficiency of three representative muzzle brakes. The study employed the Schnerr-Sauer cavitation model and the k − ω transport turbulence model, both based on the Reynolds-averaged Navier-Stokes method. Numerical simulation of the underwater firing of a 12.7 mm gun’s muzzle flow field was accomplished using a combination of user-defined function (UDF) and overlapping mesh techniques. Detailed analysis was performed on the flow field characteristics encompassing density, velocity, and phase state fields, along with an in-depth examination of the efficiency of the three muzzle brakes. The simulation results demonstrated an enhanced cavitation effect when a brake was incorporated, with the impact muzzle brake exhibiting the highest efficiency, followed by the impact-reaction type, while the reaction type exhibited the lowest performance.
The Surface Shape of Static Liquids between Double Vertical Plates in Different Gravity Environments
Authors: Ma Lu , Chang Shan , Yu Min , Ye Huan , Zhu Xuemin , Yue Xinxin 
Published: October 2023

Abstract
Liquid surface tension is produced at interfaces between liquid and air, due to the different molecular attractions on both sides. If the adhesion between a liquid and a solid wall is greater than the cohesion of the liquid itself, the liquid surface rises in a concave form due to the action of the surface tension, and the liquid near the surface produces a suction head. Conversely, if the liquid-solid adhesion is less than the cohesion of the liquid, the surface drops down in a convex form and the liquid has a pressure head. This paper systematically investigates the surface shape and tension distributions of static liquids near solid walls. The scenarios investigated the walls of double vertical plates. For the plane-based problems, an analytical method is used to extract exact solutions. For a double plates, fitting formulae are presented. All of the quantities required for these results can be easily measured in different gravity environments.
Aerodynamic Characteristics of Corrugated Features for Ahmed Model
Authors: Zhang Junning , Hu Xingjun , Wen Zhen , Guo Peng , Qing Yuxiao , Zhao Lifei , Lv Daqi , Li Shangyuan , Fan Ziying 
Published: October 2023

Abstract
The numerical simulation method is used to mimic the outflow field of 30 ° Ahmed model. The accuracy of the simulation method is verified by comparing with the wind tunnel test results. Based on the aerodynamic characteristics of the wind tunnel model, the impact of Ahmed on the structure is explored by combining the numerical simulation method of Ahmed model. The results show that the fold structure has more significant effect on lift and less effect on aerodynamic resistance.
Scalability of Viscoelastic Fluid Solvers Based on OpenFOAM-PETSc Framework in Large-Scale Parallel Computing
Authors: Feng Wei-Liang , Zhong Jie , Chen Tao , Yuan Xue-Feng 
Published: October 2023

Abstract
Enormous advances in physics of complex fluids/soft matter over last decades have rapidly transformed traditional industrial sectors in foods, personal care products, pharmaceuticals, paints, lubricants, ceramics, polymers, liquid crystals, high performance fibers, oil exploration and production into a digital era of formulation design and precision control over processing conditions from molecular viewpoint, and fertilizing a new industrial revolution. Development of high performance viscoelastic fluid solvers is of great significance for large scale digital manufacturing. In the present work, a portable and extensible scientific computing (PETSc) toolbox has been successfully integrated into the popular OpenFOAM CFD toolbox for carrying out large scale parallel computing of Turbulent Drag Reduction (TDR) and Elastic Turbulence (ET) in the isotropic turbulence flow. Its scalability has been evaluated and compared with the scalability of the OpenFOAM based viscoelastic fluid solvers. The results show that there are significant improvements.
Analysis of the Influence of Inlet Position on the Transverse Homogeneity of Slot Coating
Authors: Ma Shaohui , Tang Jinzhou , Li Yubiao , Liu Jie , Wang Liang , Li Shuke 
Published: October 2023

Abstract
Slot coating is a widely used method for high performance material production. Coating quality mainly depends on whether the coating liquid can be evenly coated on the material. To be evenly coated, the coating liquid is required to have good transverse velocity uniformity at the exit of the die. The position of the inlet of the die has an important effect on the horizontal uniformity of the die. In order to quantitatively analyze the influence of the inlet position of the die head on the transverse uniformity of the die, we respectively simulated the internal flow field of two different shapes of uniform cross section die head, and finally got the preliminary law. It is found that no matter the shape and structure of the cavity, the transverse uniformity of the coating can be greatly improved using the intermediate feeding method.
Flow Performance Analysis of Double-Chamber Gas–Liquid Transferring Device under Gas Inlet Condition
Authors: Hu Yantao , Huang Si , Hu Yuxiong , Guan Tianri , Li Yan 
Published: October 2023

Abstract
Gas-liquid mixed transportation technology is the core technology and plays a key role in the development of oil and gas production and transportation industry. Three different models of double-chamber gas-liquid transferring devices for gas field were selected as the research objects of this paper, and Fluent software was used to analyze the flow performance under the 100% gas content inlet condition. The gas-liquid two-phase distribution and the periodic relationship between pressure, temperature, tank liquid height with time of the device were calculated. The analysis revealed that the internal flow law of different models of devices is similar. A device’s operating cycle generally includes three processes ′ suction-compression-discharge ′, the pressure and liquid height within the two tanks change alternately, and the calculation formula of the cycle period has been provided. The highest temperature in the device appears at the top pipe during the compression process. The velocity at the vertical pipe at the device’s outlet is the fastest. The research methods and results can offer a theoretical reference for the design, optimization and application of the double-chamber gas-liquid transferring device.
Design, Processing and Performance Testing of Extra-Large-Flow Centrifugal Model Pumps
Authors: Chen Xinhui , Tang Zirui , Mo Yushi 
Published: October 2023

Abstract
Taking an extra-large-flow and high-power centrifugal pump as a prototype, a test model pump was designed according to the similarity theory and numerical simulation conversion. The model pump was manufactured using moldless casting technology and subjected to model test, serving as preliminary work for verifying and improving the performance of the prototype pump. The results show that the efficiency of the scaled-down model pump designed by similar conversion is about 7% lower than that of the prototype pump. The impeller and pump body of the model pump were processed using moldless casting technology, significantly reducing the manufacturing cycle. Furthermore, the test head of the model pump is close to the result of numerical simulation, and the test efficiency is 4.5% lower than the efficiency obtained by numerical simulation.
Experimental Study on Sand Production Mechanism of Underground Gas Storage in Depleted Reservoir
Authors: Hou Qi , Wei Jianguang , Qiu Ping , Zhou Xiaofeng , Gayubov Abdumalik 
Published: October 2023

Abstract
The storage of gas in underground reservoirs is critical for meeting seasonal demands, as well as for emergency situations and strategic reserves. However, the prolonged period and high flow of gas storage can lead to sand production, which can cause complications. To address this issue, a physical simulation experiment was conducted to study sand production during injection and production in underground gas storage, with varying formation pressure and water content. The results of the study indicate that lower formation pressure results in more severe sand production, and increased water content intensifies sand production. However, the displacement of sand from rock pores can improve reservoir physical properties. These findings provide valuable guidance for selecting appropriate production pressure differences during gas storage operation, based on formation pressure and water content, to ensure the rational production of gas in depleted-reservoir underground gas storage.
Ink Fluidic Behaviors during R2R Slot Die Coating on Quality Thin Film Formation
Authors: Zhang Tianwei , Meng Xin , Kang Lihong , Ge Qingtao , Zhang Jie 
Published: October 2023

Abstract
High throughput slot die coating is a desired fabrication method for flexible display, solar cell, Li-ion battery pack, intelligent package and wearable electronics. In this study, the stability of the thin film formation by slot die coating is investigated through theoretical, experimental and numerical studies with the combined effects of the fluid and substrate surface characteristics. The theoretical model based on the viscous capillary theory reveals fluid upstream and downstream distribution patterns and associated parameters that descript the coating layer stability. A 3D model based on the volume of fluid method (VOF) is developed to illustrate the coating process affecting the coating quality by the substrate velocity and flow rate. The numerical and experimental results agree that higher viscosity fluid is more prone to trap air bubbles and/or to create de-wetting areas while as the lower viscosity fluid were responsible for upstream liquid dripping. Boundary by the fluid, substrate, and operating parameters, our numerical study has developed the coating operation window to minimize or eliminate coating defects which has been confirmed by the experiments. These study results could lead high yield coating processes and efficiency in large area functional coating production.
Dynamic Test and Evaluation Analysis of an Advanced Fuel Cell Vehicle
Authors: Guo Ting , Xu Yue , Wang Guozhuo , Zhou Mingyue , Wu Shiyu , Wu Zhen , Wang Zhijun , Liang Rongliang , Wang Fang 
Published: October 2023

Abstract
Power performance is one of the key parameters to evaluate the whole vehicle. For fuel cell vehicles, because the energy is composed of electric hybrid mode, its power performance is paid more attention. In this paper, the power performance of an advanced fuel cell vehicle is tested and evaluated comprehensively. First of all, the initial state of the fuel cell vehicle test is defined, and then the typical dynamic conditions such as long idle condition, maximum speed condition and beyond acceleration condition are selected for testing. By analyzing the test results and analyzing the energy distribution under different working conditions, the results show that the power performance of the fuel cell vehicle is excellent, accelerating from 80km/h to 140km/h in only 13.3s. The test results have a certain significance for the research and development of fuel cell vehicles.
Simulation of Multi-component Thermal Fluid Flooding in Horizontal Well of Offshore Heavy Oil Reservoirs
Authors: Lin Tao , Li Tianliang , Song Hongzhi , Yuan Zhongtao 
Published: October 2023

Abstract
After many-turns of huff and puff of multi-component thermal fluid, only the heavy oil in a limited area near the wellbore is produced. However, the inter-well areas, namely the dead oil areas, are not influenced by multi-component thermal fluid. Therefore, it is necessary to carry out the research on multi-component thermal fluid flooding. The facility of thermal recovery 3D physical stimulation is adopted to carry out simulation of flooding in various well spacing of pseudo-line well pattern, and producer-injector spacing and parameters are optimized with numerical simulation. The results of physical simulation and numerical simulation results show that the effect of the 250m spacing of well pattern with injectior-productor ratio 1:3 is better than other well spacing, with maximum recovery of 56.02%. The research results provide a technical support for the offshore multi-component thermal fluid flooding experiment.
Small-scale Experimental Research on the Key Parameters Affecting Metal-to-metal Sealability
Authors: Ji Nan , Wang Peng , Xie Junfeng , Zhao Mifeng , Feng Chun , Xie Jueren 
Published: October 2023

Abstract
The harsh service environment of high pressure and high temperature (HPHT) gas well have posed great challenge to the seal integrity of the casing string thread connections. All the time, due to the complexity of metal-to-metal sealing mechanism, there is no uniform reliable sealability criterion in the Finite Element Analysis process of the casing premium thread, so a systematic research on the sealing mechanism of the casing premium thread metal-to-metal seals. In this paper, a series small-scale metal-to-metal seal tests considering different influence factors were conducted, the results showed that the average contact stress at the leakage threshold increases with gas pressure, thread compound and metal roughness has significant influence on the metal sealing property, tests with fine surface roughness (<0.05um) and without thread compound show the lowest critical average contact stress value. Based on the test results, the key parameters for calculating the sealability criterion model were calibrated, and the sealability criterion is recommended for use in high-pressure applications.
Matching Characteristics of CTHP Circulation Systems
Authors: Zhao Qi , Gu Shijie , Ma Shuang , Liu Lixin , Liu Zhe , Shi Yuntong , Wu Wende , Liu Xiaoyue , Chang Huinan 
Published: October 2023

Abstract
Cogeneration can not only reduce the use of primary energy, but also reduce the pollution to the environment; the article selects a 1200kW low-pressure stage turbine as an example to give an analysis, calculates the variation of parameters such as heat production, heat production coefficient, flow rate of cold water and hot water of this turbine, and proposes and analyzes the circulation characteristics of the CTHP system, determines the matching relationship between the steam engine driven heat pump that the system needs to meet, and fits the relationship between the steam engine efficiency and power of the heat pump. The correlation equation of steam engine efficiency and power is regressed, and the relationship of circulating cooling water flow rate with turbine discharge temperature is fitted. It is found that the heat production performance coefficients of the high and low pressure stages of the heat pump increase by 27.6% and 29.3% respectively when the discharge temperature increases from 160°C to 220°C, and the system can realize better economic and social benefits compared with the conventional CHP system.
Mechanical Study and Key Parameter Optimization of Temporary Plugging Fracturing in Tight Reservoirs
Authors: Gao Yong , Yang Zhanwei , Gao Feilong , Li Ning , Deng Shengxue , Wu Saisai 
Published: October 2023

Abstract
Staging fracturing with balls for temporary plugging is a crucial technique used to stimulate deep reservoirs. However, the transport of matter confined in a trap is very complicated. To investigate the influence of various factors on the force exerted by the ball sealer during the construction of the temporary plug, we analyse the ball sealer migration in three stages: before, after, and after the pump is stopped. We examine the effect of density, viscosity, displacement, number of holes, and fracturing fluid viscosity on the confined force state of the spherical sealer. Based on a model of entrainment dynamics with three stress states, we analyse the motion and force properties of the sphere. With this analysis, we have identified the main factors that affect the force exerted by the ball sealer. Our findings suggest that reducing the number of holes, especially when using high displacement and high viscosity fracturing fluids, can optimize the force state of the plug sphere and increase the plug efficiency. This conclusion provides a theoretical foundation for the formulation and optimization of a staged FRAC construction scheme with plug balls.
Test and Evaluation Analysis of Thermal Balance of Advanced Fuel Cell Vehicle Models
Authors: Wu Di , Xu Yue , Wang Guozhuo , Wu Shiyu , Wu Zhen , Wang Zhijun , Liang Rongliang , Guo Ting 
Published: October 2023

Abstract
The thermal balance of fuel cell passenger vehicles needs to solve the problem of heat dissipation and integration, which is the key to solve the vehicle performance for high-power fuel cell systems. In this paper, international advanced fuel cell passenger vehicles are selected to evaluate and analyze the thermal balance capability. By comparing the existing thermal balance test and evaluation methods, a test method aiming at the unique characteristics of fuel cell vehicles is proposed, including the test condition of the maximum output power of fuel cell stacks. Two fuel cell passenger cars were evaluated respectively, and the results showed that both models could quickly balance the temperature under the condition of high-speed climbing, and the key was to control the inlet and outlet water temperature of the fuel cell pile. The test method proposed in this paper has important reference value for the optimization design of thermal management system of fuel cell vehicles.
Study on the Preparation and Heat Transfer Characteristics of Temperature Sensitive Magnetic Fluid
Authors: Tang Zhen , Zhao Zhilong , Zhao Ke , Zhang Zhiwei , Feng Yali 
Published: October 2023

Abstract
Water-based temperature sensitive magnetic fluid and kerosene-based temperature sensitive magnetic fluid are prepared by using chemical co-precipitation method. The effects of magnetic particle concentration, magnetic field strength, and temperature on its thermal conductivity and viscosity were Studied. The results show that the thermal conductivity of the fluid is greatly increased by addition of magnetic particles. The thermal conductivity of water-based magnetic fluid with a concentration of 10% is increased 27.3% compared with that of deionized water; and the thermal conductivity of kerosene-based magnetic fluid with concentration of 10% is increased 128.8% higher than that of kerosene based-liquid. An experimental platform for the cooling loop is set up to verify the starting time and heat transfer characteristics of the developed magnetic fluid.
Research on Downhole Blocking and Acidizing Technology for Low Pressure Oil and Gas Wells in Old Oil and Gas Fields
Authors: Chen Zhengrong , Xie Xin , Hou Yanan , Li Yangbing , Hu Weiqiang , Yang Jianghao , Chen Jianqi , Wang Peng , Feng Lei 
Published: October 2023

Abstract
Carboniferous reservoirs in old areas pose significant challenges due to their large depths, often exceeding 3000 m and sometimes reaching up to 5000 m. These wells frequently encountered pressure gradients below 0.5 and in some cases below 0.3. This difficulty in fluid flow makes it challenging to effectively control and stimulate gas production. To address these challenges, we conducted acid stimulation trials using a variety of techniques, including conventional acid, downwelling acid dissociation, and newly tested surfactant acids. Among these techniques, surfactant acids have demonstrated superior dissolution properties in downwelling acid stimulation experiments. Its distinctive properties, such as enhanced flow characteristics and improved performance in low-pressure environments, make surfactants a promising option for future stimulation operations in low-pressure gas wells. In conclusion, our experiments have shown that the use of surfactant acid for down-well acid stimulation in low-pressure gas wells can effectively address the challenges faced in the oil and gas wells in old oil and gas fields. These discoveries have led to the development of more efficient gas production techniques in similar geological formations. Further research and application of surfactant acid can lead to enhanced stimulation results and increased gas recovery in low-pressure gas wells.