bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research Progress of High Temperature Resistant Fracturing Fluid System
Authors: Xu Ke , Lu Yongjun , Chang Jin , Li Yang 
Published: November 2021

Abstract
China has made significant progress in the efficient exploration and development of deep-seated oil and gas wells. Reservoir reformation, as the core tool of high-temperature deep-seated exploration and development, puts forward a strong demand for fracturing fluids. The ultra-high temperature fracturing fluid system developed in my country is mainly divided into two types: ultra-high temperature guar gum fracturing fluid and ultra-high temperature synthetic polyacrylamide fracturing fluid. The high temperature resistant fracturing fluid system is mainly composed of high temperature resistant thickener, high temperature resistant crosslinking agent and temperature stabilizing additives and other additives. Based on indoor research and a large amount of literature, this article summarizes the research and application of high temperature resistant fracturing fluid system, high temperature resistant thickener, high temperature resistant crosslinking agent and temperature stabilizing additives in my country in recent years, and pointed out the shortcomings and limitations of the high-temperature fracturing fluid, the technical direction of the development of high-temperature resistant fracturing fluid technology is proposed.
Study on the preparation and thermal properties of binary mixed chloride salts
Authors: Yan Quanying , Ma Chao , Wang Wei 
Published: November 2021

Abstract
Nitrate phase change materials (PCMs) are the most widely used PCMs in solar thermal power generation technology. The maximum service temperature of Nitrate phase change materials is only 600°C. Therefore, to find a phase change material with large heat capacity, wide temperature range, low heat loss and low price is the focus of current research. According to different mass ratios, nine binary molten salt mixtures were prepared by mixing lithium chloride and sodium chloride. The phase change temperature and latent heat of phase transition of them were studied by differential scanning calorimeter (DSC). The experiment results showed that since the melting point of sodium chloride was high, when the content of sodium chloride in the binary mixture of lithium chloride and sodium chloride was large, a small amount of lithium chloride could not reduce the melting point of the mixture below 600°C, the mixture could not be melted. Meanwhile, when sodium chloride and lithium chloride were melted, the phase transition temperature of lithium chloride and sodium chloride remained at about 540°C and floated at ±15°C. The melting temperature and crystallization temperature of the binary mixture of 90% lithium chloride and 10% sodium chloride were quite different, and the latent heat of phase transformation was relatively high. Therefore, the binary mixed molten salt can be used in the heat transfer and storage technology of solar power generation.
Experimental study of manganese dioxide doped with metal for the treatment of phenolic wastewater
Authors: Qin Qiushi , Huang Ji , Du Xu , Zhang Jinghong , Fu Dong 
Published: November 2021

Abstract
The wastewater containing phenol is harmful, and the process is complicated, photocatalytic oxidation technology is believed to be the greenest and promising strategy for contaminants removal because of the solar energy utilization and no additional oxidants. Herein, manganese dioxide(MnO2) doped with metal was fabricated by a low-temperature hydrothermal method, the specific surface area of MnO2 photocatalyst was significantly enhanced by doping metal ion. This making the photocatalytic performance improved obviously, and further applying for phenol degradation under visible light irradiation at room temperature.
Research on the composition of UV curing modified compounds for 3D printing based on HyperChem simulation
Authors: Bai Weicheng , Tao Mengxiao , Zhang Xianfeng , Dong Jun 
Published: November 2021

Abstract
The precursor conversion method provides the possibility of 3D printing ceramic materials, and the resin system with polysilazane as the precursor is expected to prepare high-performance ceramic materials for aviation. In this paper, the UV curing reaction system of polysilazane for 3D printing is taken as the research object, and hyperchem8.0 software is used as the research means. The model construction, chemical bond energy calculation, reaction enthalpy calculation and other modules in the software are used to simulate and predict the reaction process and mechanism of UV curing, which provides a theoretical basis for the selection and optimization of the subsequent UV curing reaction system for 3D printing.
BiOCl nanomaterials for photocatalytic degradations of nitrogenous organic compound
Authors: Sun Menglin 
Published: November 2021

Abstract
Different BiOCl hierarchical nanostructures with controllable morphologies were synthesized by a facile glycerol-mediated solvothermal method. Every products were subsequently and well crystallized characterized by a range of methods, such as scanning electron microscopy (SEM), X-ray powder diffraction (XRD), high-resolution transmission microscopy (HRTEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED). The photocatalytic properties of the samples were further investigated through photocatalytic decomposition of Methyl Orange (MO) dye. The BiOCl hierarchical nanostructures was as a result of efficient photocatatlytic activity under UV light irradiation, which can degrade MO in a few minutes.
A Covering and protection Type Porthole Die For Semi-Hollow Al-Profiles
Authors: Yun Peng , Fu Haohua , Zhou Chuhao , Deng Rurong 
Published: November 2021

Abstract
A new structure named covering type for the semi-hollow Al-profiles was present. through a common actual case, the determination of structure parameters was introduced in detail. Mainly including the arrangement of portholes, the structure design of chamber and the selection of bearing. The method of checking the die strength was introduced. According to the extrusion results, the structure of the traditional solid die and the covering type structure were compared. The characteristics of the latter structure were simple and easy to process. The practical application shows that the new die structure can enhance the die life, improve the production efficiency and reduce the cost. The high precision and the surface brightness of the profiles were obtained. The structure is worth promoting. The aim is to provide reliable data and reference for the further research and development on the structure for semi-hollow Al-profiles.
A new extrusion die for aluminum profiles
Authors: Huang Xuemei , Luo Yiru , Zhou Chuhao , Deng Rurong 
Published: November 2021

Abstract
A new type of extrusion die is put forward, in which cemented carbide material is used to inlay the working part of the die, so as to improve the wear resistance of the die. The necessity of using cemented carbide in extrusion die is introduced. The selection of cemented carbide was introduced by taking the actual round tube aluminum profile as an example. The method for determining the size of cemented carbide and the mosaic method of cemented carbide were described. Based on the results of extrusion, the common extrusion die and cemented carbide extrusion die were compared. The results show that the wear resistance of the die can be greatly improved by the use of cemented carbide. Thus the life of the die is greatly improved.
Lift and Drag Coefficient Map of NACA4415 Airfoil
Authors: Yin Rui , Huang Jing , He Zhi-Yuan 
Published: November 2021

AbstractThe NACA4415 airfoil was numerically simulated with the help of the Fluent software to analyze its aerodynamic characteristics. Results are acquired as follows: The calculation accuracy of Fluent software is much higher than that of XFOIL software; the calculation result of SSTk-ω(sstkw) turbulence model is closest to the experimental value; within a certain range, the larger the Reynolds number is, the larger the lift coefficient and lift-to-drag ratio of the airfoil will be, and the smaller the drag coefficient will be; when the angle of attack is less than the optimal angle of attack, the Reynolds number has less influence on the lift-to-drag coefficient and the lift-to-drag ratio; as the Reynolds number increases, the optimal angle of attack increases slightly, and the applicable angle of attack range for high lift-to-drag ratios becomes smaller.
Analysis and treatment of insulation abnormality of a 220kV wall bushing end shield
Authors: Hu Yujing , Cao Xianhui , Zhang Gefei , Zuo Penghui , Wan Xun , Wu Tangqing , Xie Yi , Chen Wei 
Published: November 2021

Abstract
This work expounds a case of insulation abnormality of a 220kV wall bushing end shield caused by the failure of rubber seal gasket. The mechanism and causes of insulation abnormality were put forward combined with the method of on-site inspection, XRF analysis, infrared spectroscopy (IR) analysis and thermogravimetric analysis. And suggestions for the improvement of sealing performance to prevent this kind of defect and management of operation and maintenance of bushing end shield were proposed.
Analysis of influencing factors of flow state concrete mixture performance
Authors: Shi Dandan , Qin Xing , Qu Hao 
Published: November 2021

Abstract
Based on the principle of benefiting the durability of concrete, machined sand is used to configure C40 flow concrete, and the engineering application environment and economy are considered. In this paper, the author through the flow state concrete mix ratio design, give the raw material dosage, concrete mixing, finally combined with the workability measurement method, five groups of concrete mix performance testing. According to the test results, the influence of mineral admixture and water reducing agent on the workability of concrete mixture is studied and analyzed, and the reasonable admixture dosage and water reducing rate of water reducing agent and its admixture dosage are finally given.
Research progress of microcapsule self-healing anticorrosive coatings
Authors: Chen Ao , Tong Ling , Wu Lin , Liu Ying , Yang Xiaoyu , Liao Zhiyuan , Zhang Baoguo , Zhou Yilai , Hu Ya 
Published: November 2021

Abstract
During the long-term use of the coating, environmental factors, physical damage or other factors may cause micro-cracks in the coating. The expansion of microcracks will destroy the overall structure of the coating, reduce the protective effect of the coating and degrade its mechanical properties. However, the traditional repair methods need to consume a lot of manpower and material resources, and the micro-cracks in the coating are difficult to be repaired by the traditional external means. Inspired by biological systems, intelligent coatings with certain self-healing ability have attracted wide attention in academia and industry. According to the different remediation agents used in self-healing micro capsules, several common self-healing coating systems of micro capsules were analyzed, including corrosion inhibitor system, capsule drying oil system, capsule reactive repair agent system, etc.
Study on Structure Type and Operation Condition of UHVDC Wall Bushing
Authors: Zhang Shiling , Gong Lin , Deng Baojia 
Published: November 2021

Abstract
When the ±800kV UHVDC capacity is increased to 10000MW, the transmission current is 5kA and 6.25kA, which will put forward new requirements for the key technology of UHVDC through wall bushing: in UHV level, the key of through wall bushing lies in the research of basic technology of voltage sharing and field sharing. In the case of large current carrying capacity, the key lies in the basic technology research of current sharing and heat sharing. When the DC wall bushing, converter bushing and outgoing line device operate at the rated voltage, the central conductor is heated due to the carrying large DC current. Therefore, the temperature field distribution inside and at the tail of the bushing core is uneven, and the resistivity is the function of temperature, resulting in the change of resistivity with temperature and the change of potential and electric field distribution with resistivity during operation. Therefore, under the above high current operation conditions, in-depth key technology research is required for the design of bushing current carrying device, calculation of internal potential and electric field distribution, voltage sharing, field sharing, current sharing and heat sharing technology. The combined action of electrical and thermal stress will significantly affect the internal electric field distribution of converter transformer core and accelerate the aging rate of core composite insulation material, which introduces new research topic for the key technology of UHVDC converter bushing. The electric field and voltage distribution of UHVDC bushing are theoretically analyzed, the insulation structure is optimized from the aspects of material and structure, and the manufacturing process and the test technology are deeply and systematically studied.
Numerical modeling of cracking behavior in Cr coating for ATF cladding under three-point bending
Authors: Yuan Mingduo , Pan Ziyan , Zou Zhenyu , Zhang Weijian , Du Mingyue , Jiang Jishen , Ma Xianfeng 
Published: November 2021

Abstract
In-situ three-point bending tests and finite element modeling based on the cohesive zone model were developed to study the stress evolution and cracking behavior of the Cr coated Zr-4 alloy for accident tolerant fuel claddings. The initiation and propagation of micro-cracks were captured by in-situ observation and predicted by the numerical simulation. The results showed that vertical cracks first initiated from the coating surface and propagated to the Cr/Zr4 interface. Under larger bending strain, interfacial cracks began to initiate from the vertical crack tips driven by large local stress concentration.
Analysis of response characteristics of comprehensive geophysical prospecting technology in concealed water-bearing structures
Authors: An Jinsong , Ma Zhichao , Du Hailong , Li Wen , Zhao Weiye , Liu Qinghua , Dou Wenwu , Lian Yuguang , Cui Jinliang , Wang Guoku , Chen Jianqiang , Zhang Lin 
Published: November 2021

Abstract
The mine transient electromagnetic method and the mine direct current method were used to detect the abundant water at 1,144 m ahead of the track roadway on the 9101 working face in the Chaoyang Coal Mine. Low-resistance abnormal areas indicated by both methods were analyzed comprehensively for early warning of water hazards. The results showed that two low-resistance abnormal areas were indicated by the mine transient electromagnetic method and the existence of a low-resistance abnormal area was indicated by the direct current method. Both methods showed the existence of a low-resistance abnormal area ahead, delineating possible illegal mining areas of old kilns ahead, which were verified by drilling. The methods can indicate the direction for drilling. The case shows that the combination of different geophysical prospecting methods can eliminate their limitations and that comprehensive detection can reduce omissions, which has a good guiding significance for safe mine excavation.
Conversion of CO2 in a gliding arc discharge reactor: Discharge characteristics and the effects of different parameters
Authors: Zhang Tinghao , Lu Na , Shang Kefeng , Jiang Nan , Li Jie , Wu Yan 
Published: November 2021

Abstract
In this work, a knife-shaped gliding arc discharge (GAD) reactor driven by a modulated pulse power supply was used to convert CO2. The discharge image, voltage and current waveforms of GAD were recorded experimentally. The effects of gas flow rate, input voltage, and the duty cycle of power supply on CO2 conversion were studied. A CO2 conversion of 3.8% and energy efficiency of 39.6% could be achieved. Compared with other non-thermal plasmas, GAD has a slightly lower CO2 conversion but higher energy efficiency. In addition, the capacity of CO2 treated by GAD (6 L/min) was significantly higher than other non-thermal plasmas (e.g. 25 mL/min-125 mL/min in corona discharge and dielectric barrier discharge).
Application of 66kV Active Intervention Grounding Arc Suppression Device
Authors: Meng Zhen , Li Zhongwei , Pan Yueming 
Published: November 2021

Abstract
The energy supply is mainly based on electric energy at present, and power supply reliability is an important indicator for evaluating power supply services. In view of the 66kV transmission voltage level unique to Northeast my country, the neutral point of the transmission system directly affects the stable operation of the power system. First, the composition of the substation in the system and the working principle of the arc suppression device are analyzed. Secondly, when a single-phase grounding fault occurs in a 66kV neutral point ungrounded system, an active intervention grounding arc suppression device is designed. Finally, the operating characteristics of the designed grounding arc suppression device are demonstrated based on the simulation results.
Research on the detection of arc fault in series connection of landscape power supply
Authors: Deng Yi , Li Yuanli , Xiong Yingpeng , Zhang Xuewen 
Published: November 2021

Abstract
Aiming at the series fault arc phenomenon in landscape lighting and the hidden dangers of electrical fires, in this paper, a landscape power supply series fault arc model is constructed and its model is simulated. The simulation results show that when a fault occurs, the arc current becomes smaller (almost zero) due to the increase in the impedance of the lighting circuit; this phenomenon is called the “current zero off” phenomenon of the fault arc current. The current zero off phenomenon of the fault arc current is the main fault feature in the landscape lighting circuit. In this paper, the wavelet algorithm is used to detect the fault current waveform. According to the fault characteristics, by judging whether the modulus maximum value of the wavelet coefficient has periodic characteristics with an interval of 100±15 sampling points, it is analyzed whether a series-type arc fault occurs. The built physical model verifies the feasibility and correctness of the arc detection algorithm. The research results of this paper have certain reference value for the detection and application of fault arc.
Research progress on the cathode and anode of aqueous zinc ion battry
Authors: Fu Chengyu , Gao Dongming 
Published: November 2021

Abstract
Electrochemical energy storage problems become a worldwide research direction. Now Lithium-ion batteries (LIBs) are the most common battery product. However, LIBs still has many shortcomings such as, safety problems, a scarcity of lithium, and high price. Rechargeable aqueous-based zinc ion batteries (AZIBs) with lower costs, fewer safety risks as well as abundant zinc reserves have attracted extensive research interest. For the current electrode materials of AZIBs, for example, Mn-based materials, V-based materials and metallic zinc, scientists have done in-depth research to develop the performance of the materials, but complex processes are still inevitable. As a result, sustainable and scalable manufacturing technology and electrode materials with high capacity and the longer service life is the research direction.
Fe2O3 Embedded Nitrogen-doped Biomass Carbon as Electrocatalyst for the Oxygen Reduction Reaction
Authors: Wu Yanling , Jiao Huiji , Hou Mingqian , Zhang Peng 
Published: November 2021

Abstract
Catalyst for ORR is important in the field of energy conversion. Previous research has shown that nanoparticle-embedded into N-doped carbon materials are a good ORR candidates. Here, Fe2O3/N-doped biomass carbon (named Fe2O3/N-bio-C) ORR catalyst via a pyrolysis process of mixture from the Heme precursor and biomass material (named poplar flowers). The as-synthesized electrocatalyst of Fe2O3/N-bio-C exhibits good electroactivity due to the formation of Fe2O3 nanoparticle active sites and abundant N-containing groups. The work points the way to synthesize the low-cost Fe-based N-doped biomass carbon ORR catalysts.
Preparation of fly ash-based flocculant and flocculation performance
Authors: Zhang Junxin , Duan Xiumei 
Published: November 2021

Abstract
Using fly ash from a thermal power plant in Yingkou City as raw material, The inorganic polymer flocculant polyaluminum ferric chloride (PAFC) was prepared by sodium carbonate impregnation, high temperature roasting activation, and acid leaching. The influence of activation temperature and activation time on the leaching of aluminum and iron was investigated through single factor test and orthogonal test. The PAFC preparation conditions were optimized, and the prepared PAFC flocculant product was applied to kaolin turbidity water. The test results showed that the content of aluminum in fly ash was 7.08%, and the content of iron was 4.95%. The mass ratio of the activator sodium carbonate and fly ash was 10:7, the activation temperature was 800°C, and the activation time was 2h. The leaching rates of aluminum and iron were the highest, 88.31% and 53.66% respectively. The optimal conditions for the preparation of the flocculant were as follows: the molar ratio of aluminum to iron was 5.7:1, and the reaction time was 1.5h. The liquid product obtained under these conditions was yellowish brown, and the solid product obtained after being dried was yellow powder.
Effect of loading sequence between Cu and Fe on SCR-C3H6 performance for Al-PILC based bimetallic catalysts
Authors: Wen Nini , Cheng Jianghao , Su Yaxin , Hu Mingtao , Deng Wenyi , Zhou Hao 
Published: November 2021

Abstract
To investigate the effect of impregnation sequence on SCR-C3H6 performance, Al-PILC based catalysts with different impregnation sequences between Cu and Fe were prepared. Activity result showed that impregnation sequence influenced the SCR-C3H6 performance, where, the NO conversion followed the order from high to low: Cu-Fe/Al-PILC>FeCu/Al-PILC>CuFe/Al-PILC. XRD results indicated that the dispersion of the active phase was related to the impregnation sequence. The specific surface area was not the crucial factor affecting the activity. UV-Vis demonstrated that isolated Cu2+ and Fe3+ contributed to activity rather than CuO and Fe2O3 particles, and more isolated Cu2+ and Fe3+ existed on Cu-Fe/Al-PILC. H2-TPR and XPS results revealed that superior reduction ability and more surface adsorbed oxygen led to the excellent SCR-C3H6 performance for Cu-Fe/Al-PILC catalyst.
Rare earth doping effect on the thermal stability of Ce0.35Zr0.60M0.05O2: insights from experiment and simulation
Authors: Zhao Zheng , Zhang Yongqi , Yang Juanyu , Hou Yongke , Cui Meisheng , Feng Zongyu , Huang Xiaowei 
Published: November 2021

Abstract
CexZr1-xO2 (CZ) plays an important role in many environment catalytic fields such as automobile three-way catalysts (TWCs), but improving their thermal stability is still a great challenge. In this work, a strategy was proposed to enhance the thermal stability of CZ by combining experiment with ab-initio molecular dynamics (AIMD) method. It is found that the thermal stability of Ce0.35Zr0.60M0.05O2 (M represent La, Y, and Nd elements) could be adjusted by doping the suitable rare earth (RE) elements in the surface of CZ. With this strategy, the thermal stability of Ce0.35Zr0.60M0.05O2 (CZ-Y) with surface doping of Y is highest among these Ce0.35Zr0.60M0.05O2 samples. In comparison with the CZ sample without doping (specific surface area SSA=20.16 m2⋅g-1), CZ-Y exhibit superior thermal stability (SSA=26.83 m2⋅g-1) after thermal treatment (1100 °C/10 h). To give a deep insight into the RE doping effects, the thermal displacement rate (TDR) of Ce0.35Zr0.60M0.05O2 are further calculated by AIMD. It is found that CZ-Y has the lowest TDR values, which is beneficial for suppressing the thermal displacement of atoms and improving the thermal stability of CZ. This study provides a deep insight into the origin of rare earth (RE) doping effect on CexZr1-xO2 (CZ), which is of fundamental interest for the development of high performance CZ in practical applications.