bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of Polystyrene/Polyacrylamide Core-Shell Microspheres via Microfluidizer-Assistant Emulsification Template Methods for Oil Recovery Enhancement
Authors: Sheng Li , Cui Jia , Gao Yuan , Yuan Wenjing , Wu Ying , Liu Liuxin , Lu Xiaoying 
Published: April 2023

Abstract
Polyacrylamide and its derivatives are commonly used functional polymers to enhance oil recovery in a water-flooding oilfield. By using its hydrophilic amide group to swell and gel in stratum water, it can plug the fractures and pore throats of underground. In order to improve the strength of polyacrylamide material, the polystyrene/polyacrylamide (PS/PAM) core-shell microspheres were successfully prepared by the microfluidizer-assistant emulsification template method. The influences of different preparation conditions, such as the different types and concentrations of surfactants, organic phase and oil/water ratios, on the morphology, diameter, and distribution of corresponding PS core have been systematically studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and laser light scattering analysis (LLS). Moreover, by the integration of porous meshes onto both inlet and outlet of the interaction chamber, the resultant polymer microspheres could be tuned larger due to the dual homogenization. Our procedure can provide a simple and general method to modulate the diameter of the polymer microspheres in the range of 30 nm to 3 μm with a narrow polydispersity index (PDI) of <0.2. The PS/PAM core-shell microspheres exhibited good water plugging performance.
Prestress Modal Analysis under Assembling Error of Diaphragm Disc Coupling
Authors: Cao Angang , Zhou Bin , Zhu Yonggang 
Published: April 2023

Abstract
The high-speed and high-torque diaphragm disc coupling used in coal machine-driven systems is the critical power transmission component, especially in high-speed and heavy-duty shafting. The dynamic rotor characteristics are significant. In the case of external excitation in the installation or working process of diaphragm coupling, it is inevitable to have axial deviation, angular misalignment, and radial misalignment error. Therefore, analyzing the prestress mode under the assembly error of diaphragm disc coupling is crucial. The finite element model of diaphragm plate coupling was established using ABAQUS software. The accessible way under critical speed, the mode under axial dislocation, and radial dislocation were analyzed. The results show that the assembly error of the diaphragm disc coupling will affect the first and second-order natural frequencies in a specific range but will not cause resonance.
Simulation and Experimental Research on Low-Frequency Vibration and Rotation Assisted Micro-EDM Gap Flow Field
Authors: Yi Guanwei , Guo Guangyu , Zhang Mingfang , Huo Mengyou 
Published: April 2023

Abstract
As the depth increases when the Electrical Discharge Machining (EDM) process is applied to the machining of micro-holes, it becomes more difficult to remove the corrosion products, leading to a decrease in machining efficiency. In order to study the mechanism and effect of the additional low-frequency vibration and rotating motion of the electrode on the improvement of micro-EDM chip removal, this paper firstly conducted a simulation study on the flow field of the machining gap, and analyzed the pressure, velocity and electrical erosion of the gap flow field by adding different auxiliary motions. The simulation results show that the auxiliary motion has a greater promotion effect on the elimination of electro-erosion products; after further experimental tests, the processing results show that adjusting the appropriate vibration frequency and rotation speed can greatly improve the chip removal ability, and then the processing efficiency has been greatly improved.
Optimal Matching Method of Structural Parameters of Hydro-mechanical Transmission Device
Authors: Wang Di , Zhu Genghui , Yang Long , Liu Quanzhong 
Published: April 2023

Abstract
In this paper, for the hydro-mechanical transmission device with constant speed input and variable speed output, an optimization model is constructed, which takes the structural parameters of the fixed gear train, the rotating gear train, and the circular diameter of the torque converter as the design variables and the weighted comprehensive efficiency as the objective function. The optimization model considers the influence of the change of the stator opening on the original characteristics of the torque converter, and limits the value of the structural parameters of the planetary gear train by the reference value of the transmission ratio of the planetary gear train given in the mechanical design manual, and gives the steps to solve the optimization model by using the search algorithm. The value range of the hydraulic torque converter is limited by reversely calculating the circulation circle diameter of the hydraulic torque converter within the speed range, so as to improve the search efficiency. The optimization model and solution method are verified by taking a boiler feed pump of a thermal power plant as the load.
Study on the Effect of Two Angle and Two Flow Oxygen Lance Jet on Molten Pool in Converter
Authors: Jia Hongbin , Liu Xiang , Gui Lin , Han Peng , Liu Kun 
Published: April 2023

Abstract
To achieve the smelting effect of low splash in large and medium-sized converters, the jet flow field simulated by compressed air at room temperature is studied by the oxygen lance (OL) jet detection experimental system in this paper. This paper mainly analyzes the variation law of jet velocity at the geometric axis of the OL nozzle and scalar distribution and attenuation of jet isovelocity line at different cross sections. The results show that the oxygen jet cross-section of all OL nozzles gradually expands with the rise of OL position. When the large hole flow ratio is between 55% and 65%, the large hole angle is between 12° and 14° and the small hole angle is between 16° and 18°, therefore the angle of hole plays a significant role in the impact radius. The larger the angle is, the larger the impact radius is. The area of action between jet and molten pool could be enlarged by staggered double-structure six-hole OL.
Optimal Design of Torque Converter Blade Angle Based on Surrogate Model Method
Authors: Zhu Genghui , Li Zhenyu , Dong Yong , Liu Quanzhong 
Published: April 2023

Abstract
In this paper, the blade cascade system of the basic torque converter JQB2 is redesigned and changed into a hydraulic torque converter with an adjustable stator. Firstly, the basic torque converter cascade system is modified to realize the adjustable stator. In order to study the influence of the blade angles on the performance of the torque converter, the blade angles were parameterized. Taking the peak efficiency of the torque converter at the design opening as the optimization objection, the pump torque factor is not less than 90% of the initial torque converter as the constraint condition. The central composite experimental design method was used to generate 49 design points, and the Kriging surrogate model was selected to construct the response surface of efficiency and pump torque factor, and to verify the goodness of fit of the response surface, and then iteratively search for the optimal response surface. The peak efficiency of the optimized JQB2X is 89.7%, which is 1.6% higher than that before optimization. After optimization, the pump torque factor is 6.1×10−6, which is slightly lower than that of the basic torque converter, but it can still maintain the large capacity of the torque converter.
Study on Wet Purification of Keerjian Bentonite
Authors: Deng Lirong , Lu Yufeng , Shang Xinlong , Liu Zhenxing , Dong Yongwang 
Published: April 2023

Abstract
The application potential of bentonite is closely related to the content of montmorillonite from it, and the purification of bentonite is conducive to expanding its industrial application. In this paper, purification method of Keerjian bentonite with low to medium grade were studied systematically. A comparative study of natural settlement, chemical dispersion and high-speed centrifugation was carried out. In addition, one-factor experiment and orthogonal experiment on a compound purification method, chemical dispersion following by high-speed centrifugation, were conducted. According to the experimental result, the optimal parameters of the compound purification, namely slurry ratio 1:8, dispersant amount 1.2% and soaking time 24h, were obtained. This study solved the problem of low utilization level and low purification efficiency, which shade light in the application of Keerjian bentonite with high efficiency and high economic benefits.
Strain-Modulated Electronic and Thermal Transport of Monolayer Black Arsenic Phosphorus
Authors: Li Xiangke , Yang Hai , Jin Guojun 
Published: April 2023

Abstract
In this paper, the first-principles density functional theory and non-equilibrium Green’s function method were used to investigate the effect of strain on the electronic and thermal transport of monolayer black arsenic phosphorus (B-AsP). Through this research, we found that the band gap of the monolayer B-AsP decreased under compressive strain, the electronic transport was revealed by I-V curves, and there was current at a very small voltage. The compressive strain can enhance the electronic transport, but it does not have a favorable effect on the thermal transport. When increasing the temperature at the same time for the tensile strain, the thermal transport has been improved, reflected by the ZT coefficient, which is increased by 7.76% compared with the original system. At the same time, we also used temperature to regulate the ZT coefficient. At a high temperature of 400 K, the ZT coefficient is larger than the one at room temperature by 26.11%.
Effect of Nb/V/Ti Microalloy on Microstructure and Properties of 16Mn Seamless Steel Pipe
Authors: Yuan Qin , Wang Shanbao , Zhao Bo , Wu Hong , Cheng Junxia , Xie Degang 
Published: April 2023

Abstract
In order to study the effect of Nb, V and Ti microalloys on the microstructure and properties of 16Mn seamless steel tube, the static CCT diagram of tested steel was made on Glecble-3800 thermo-mechanical simulator. Based on the observation of microstructures and precipitates by optical microscopy, SEM and TEM, the effect of different microalloy on mechanical properties of 16Mn steel was analyzed. The results show that Ti treated 16Mn steel is advantageous to both grain refinement and the low temperature impact toughness. The impact toughness of Nb or V microalloyed steel is decreased, which appeared bainite in hot rolling. Normalizing can improve the impact toughness of Nb microalloyed steel, while the microstructure and properties of V microalloyed steel are not improved. 16MnTi is taken to produce hot-rolled pipes with wall thickness between 8 mm to 16 mm, that impact value is more than 80 J at - 40 °C; while 16MnTiNb is taken to produce normalized pipes with wall thickness greater than 16 mm, that impact value reaches 120 J at -40°C.
Modeling and Simulation of Removal Function for Dual-axis Wheel Polishing
Authors: Chen Fulei , Peng Xiaoqiang , Lai Tao , Hu Hao , Wang Guilin , Luo Tiancong 
Published: April 2023

Abstract
Modern optical manufacturing techniques, such as stress disc polishing, bonnet polishing, magnetorheological finishing, and ion beam finishing, suffer from edge effects or low removal efficiency. To solve the above problems, this paper mainly studies dual-axis wheel polishing technology. According to the Preston equation combined with Hertz contact theory and kinematics, a theoretical removal function model of dual-axis wheel polishing is established. Then, the removal function shape and removal efficiency under different revolution-to-rotation speed ratios are simulated. From the simulation results, it can be concluded that the removal function of the dual-axis wheel polishing technology in this paper is Gauss type when the revolution-to-rotation speed ratio is 10:1 or less. With the increase of rotation ratio, the efficiency of the removal function is higher. This paper establishes a theoretical foundation for the design of the dual-axis wheel polishing device.
The Performance Analysis of Elevator Brake
Authors: Ren Zhaolin 
Published: April 2023

Abstract
In order to understand the safety status of traction drive elevator brake, taking the most common drum brake as the research object, several common failure forms of drum brake and the problems found in brake disassembly are summarized and sorted out. Based on the analysis of failure causes, suggestions on the use and maintenance of elevator brakes are put forward, and the in-service elevator brakes which have been used for a certain period of time are tested, and the performance characteristics of the in-service elevator brakes are analyzed, which provides a basis for the promotion of hidden trouble investigation and rectification of elevator brakes.
Study on Spent Lubricating Oil from Catalytic Cracking of Al/SO42-/AL-MCM-41 Molecular Sieve
Authors: Gong Jing 
Published: April 2023

Abstract
The waste lubricating oil will cause great harm to the natural environment if it is discarded randomly or handled improperly. Catalytic cracking is the main technology for regenerating waste lubricating oil into fuel oil. The molecular sieve Al/SO42-/Al-MCM-41 was prepared by introducing metal Al atoms into the molecular skeleton of MCM-41 and then modifying it with Al2(SO4)3. The samples in the preparation process were characterized and analyzed by TG, FTIR, XRD, N2 adsorption desorption and other test techniques. The effects of reaction temperature and the amount of catalyst on catalytic cracking of used lubricating oil were studied. The results show that: The existence of large pores in the catalyst is conducive to the entry of waste lubricating oil molecules into the pores, so that the surface active sites of the catalyst can be fully utilized. When the silicon aluminum ratio is 1:0.02 and the calcination temperature is 600 °C, the catalyst has the highest activity. When the reaction temperature is 400°C, the reaction pressure is 0.01 MPa, the stirring speed is 200 rpm, and the amount of catalyst is 2.8 g. The yield of gas product is 1.11%, the yield of liquid product is 87.02%.
Simulation on the Solid Flow in COREX Shaft Furnace with CGD Using DEM
Authors: Wang Xiaoai , Luo Zhiguo , Zhang Caidong , Li Lanjie , Yao Hongyong , Tian Zhiqiang , Han Xing 
Published: April 2023

Abstract
In order to obtain the resonable gas distribution, a Center Gas Distribution (CGD) technology was introduced into a new set of COREX-3000 in Baosteel. However, CGD can affect the solid flow in the shaft furnace. In this paper, DEM was used to investigate the basic solid flow pattern, the influence of discharging rates and non-uniform discharging rates on the burden movement and the influence of CGD on the solid flow pattern. The influence of CGD on the velocity and distribution of solid flow was also studied. The results confirm that there are three types of flow zones in furnace. The discharging rate has almost no effect on the overall burdern movement. The non-uniform discharging rate leads to a large stagnant zone on one side of the shaft furnace. CGD has a great influence on the solid flow pattern of furnace, and there may be two stagnant zones where the small particles tend to segregate. The distribution of particles velocity along the radial is different with the distance from the bottom.
Degradation of Methylene Blue Using Fe-ZSM-5 Zeolite as a Heterogeneous Fenton Catalyst
Authors: Ning Mencui , Li Li , Xu Xiaojing 
Published: April 2023

Abstract
A Fe2O3 modified ZSM-5 hybrid was synthesized by solid phase exchange method in this work. The prepared Fe-ZSM-5 material was characterized by XRD and SEM and was used as a heterogeneous Fenton catalyst in oxidation of methylene blue. The influences of different parameters such as the initial pH value, the amount of catalyst, amount of H2O2, contact time and reaction temperature on the removal rate of methylene blue were evaluated. Results showed that under the optimum conditions of catalyst dosage of 1.1 g/L, initial pH value of 3.0, reaction temperature of 30°Cand H2O2 30 mmol/L, 98.2% of decolorization rate could be achieved in 60 minutes. This work provides a promising catalyst for the decolorization of methylene blue in aqueous solution.
Effect of Natural Particles on the Growth and Behavior of Sebastes Schlegelii
Authors: Diao Wenjing , Liu Liuqingqing 
Published: April 2023

Abstract
In recent years, human activities and climate change are likely increasing the input of particles in the aquatic environment, raising concerns about the negative effects to aquatic organisms. However, the impact of natural particles on the marine organisms is not clear. Here, this study compared the effects of two different size of natural particles on the growth and behavior of Sebastes schlegelii. Results indicated that the weight gain rate and specific growth rate of juvenile fish in the P-S treatment group were respectively reduced by 11.12% and 1.48%, while it respectively reduced by 17.62% and 2.16% in P-L treatment group after 7 days of exposure. In addition, dietary exposure to natural particles seriously increased the average speed and distance moved of the fish than the control, and the negative effects was enhanced with the increase of particle size. The results not only showed the inhibition of natural particles on the growth of the juvenile fish, but indicated that the locomotor activity of the juvenile fish was increased. This study provided basic theoretical data for assessing the effects of natural particles on aquatic organisms.
Environmental Impact Assessment of Apple Production under Different Production Modes and in Different Regions in China
Authors: Men Xiaopeng , Wang Yubin , Xu Xuefeng , Wang Yi , Han Zhenhai 
Published: April 2023

Abstract
The full-fruit period in apple orchards has the greatest environmental impact during the whole apple life cycle, and the characteristics of apple planting and high investment in agricultural materials in China aggravate the impact of this stage on the environment. The life cycle assessment (LCA) method was used to study the resource use (RU), global warming potential (GWP), environmental acidification potential (AP), and eutrophication potential (EP) of apple orchards in the full-fruit period. These apple orchards are, smallholder orchards (SO) in the Bohai Bay area (BH), commercial orchards (CO) in the Bohai Bay area, smallholder orchards in the Loess Plateau area (LP), and commercial orchards in the Loess Plateau area. The results showed that the RU of commercial orchards was 23.87% higher than that of smallholder orchards, the EP of smallholder orchards was 72.36% higher than that of commercial orchards, the RU of the Bohai Bay was 19.70% higher than that of the Loess Plateau, the EP in the Loess Plateau was 35.93% higher than that in Bohai Bay.
Preparation and Photocatalytic Degradation of ZnO Graphene Composites
Authors: Guan Xianqi , An Changwei , Zhang Jun 
Published: April 2023

Abstract
A series of ZnO graphene composites with different reduced graphene oxide (RGO) contents (0%, 2%, 4%, 6% and 8% (mass fraction)) were prepared by solvothermal method. The composite samples were characterized by XRD, SEM and pl. The results show that all the composite samples doped with RGO do not change the structure of ZnO; Pure ZnO samples are spherical particles with grain size of about 40 nm. After adding RGO, the grain size of the samples is uneven, and the agglomeration of the composite samples increases gradually with the increase of RGO content; The emission peaks of all composites are near 373 nm. With the increase of RGO content, the intensity of the intrinsic emission peak of the composites decreases first and then increases. The introduction of RGO makes the absorption peak has a slight red shift, which improve the visible-light absorption ability of the composites. With the increase of RGO content, the photocatalytic performance of the composites increased first and then decreased. When the RGO content was 6% (mass fraction), the photocatalytic performance of the composites was the best, and the degradation rate and reaction rate constants reached 71.97% and 0.017 min-1 respectively.
Energy Conservation and Carbon Reduction of Air Source Heat Pump for District Heating
Authors: Zhao Yuan , Gao Jun , Zhu Bo , Qian Tang , Wang Dabiao , Wang Qilong , Zhao Ruirui , Dai Baomin 
Published: April 2023

Abstract
Using ASHP for space heating is an environmental solution. Based on the concept of Lorenz cycle, an ASHP is proposed. Taking a residential community as an example, this study proposes a thermodynamic model. Then, the energy consumption and carbon emission performance of the heating system are discussed. The results indicate that the primary energy consumption of ASHP is 13.45% less than the coal-fired boiler and the carbon emission reduces by 1203.6 tCO2. This study is meaningful for the development of air source CO2 heat pump for space heating integrated with DMS.
Ballistic Wound Evaluation Based on Dye Diffusion Method
Authors: Mo Genlin , Jin Yongxi 
Published: April 2023

Abstract
Ballistic gelatin is widely used as a kind of tissue simulants in wound ballistics. Evaluations of the wound tract of gelatin by projectiles are mainly based on fissures in the gelatin slices. For there are difficulties in building relationships between the areas and the fissures, a new method based on dye diffusion is proposed in this paper. Colored regions in the slices are obtained after penetration of a Chinese 7.62mm rifle bullet into the gelatin block. The colored regions can be divided into ‘X’, ‘I’ and branching ‘I’ shapes. In the second half of the penetration, there is a strong correlation between the areas of the regions and the energy dissipation of the bullet. However, the correlation is poor in the first half of the penetration. Branches of the colored regions mainly distributed at the heads and tails of the permanent cavities. The permanent cavities’ shapes have a great dependence on the nutation angles of the bullets. Orientation angles of the permanent cavities are determined by the precession angles of the bullets.
Solution of Density Profile Function of Trapped Fermi System
Authors: Liu Hongyan , Ren Shufeng , Wang Jiaxiao , Li Yushan 
Published: April 2023

Abstract
Starting from many-body theory, the density profile function of ideal Fermi systems in harmonic and delta traps are obtained under the quantum mechanics and thermodynamic statistical physics, respectively. The related thermodynamic properties are analyzed based on the Fermi-Dirac distribution and exact solution of the density profile function.
2-D Quantum Ising Model Fidelity and Order Parameter
Authors: Li Shenghao , Wu Yuanyuan 
Published: April 2023

Abstract
This paper explores an interesting relationship between the ground-state fidelity quantum phase transitions and bifurcations per lattice site, and proposes a universal order parameter for the quantum Ising model for a square lattice of infinite-size in two spatial dimensions as a prototype model with symmetry breaking order. The approach is based on computing ground-state wave functions using a tensor network algorithm utilizing a representation with infinite projected entangled-pair states. The results can be applied to any systems with symmetry breaking order, because in the conventional Landau-Ginzburg-Wilson paradigm a quantum system subjected to a phase transition exhibits spontaneous symmetry breaking quantified by a local order parameter. A reduced fidelity bifurcation between two different reduced density matrices is also explored.