bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparison of Punching Shear Behaviour of Two-Way Concrete Slab Reinforced with CFRP Grid and Steel Bars
Authors: Duan Ning , Zhang Jiwen 
Published: April 2023

Abstract
Two punching shear failure tests of two-way concrete slab reinforced by CFRP grid and HRB 400 steel were studied in this paper. The reinforcement ratio of slab reinforced with CFRP grid and HRB400 is 0.33% and 0.37 respectively. The upper and lower surfaces of the concrete slab’s tensile and compressive strains, the reinforcement strains, the load deflection of the slabs, and the applied load value were analyzed. The results show that under approximately the same reinforcement ratio, the concrete slab reinforced with CFRP grid has higher bearing capacity. Both slab failure formed with punching cones, the punching cone angle of CFRP grid slab is 24.1°, which is far less than 38° for reinforced concrete slabs. The tests results indicated that there is a cooperative between longitudinal and transverse limb of CFRP grid.
Analysis and Assessment of Prestressed Reactive Powder Concrete Box-girder Bridge with Corrugated Steel Webs
Authors: Ao Deng , Hu Guoxi , Xu Qiang 
Published: April 2023

Abstract
Prestressed concrete box girder bridge with corrugated steel webs is a new type of bridge which uses corrugated steel webs to replace the traditional concrete webs. Compared with the traditional box girder bridge, it has certain advantages and has been widely used in bridge engineering. Combined with the characteristics of prestressed concrete box girder bridge with corrugated steel webs and reactive powder concrete theory, this paper puts forward the concept of new prestressed corrugated steel webs reactive powder concrete box girder bridge. By improving the material properties, structural design and construction methods of prestressed concrete composite structure with corrugated steel webs, its bearing capacity can be improved, so as to improve its construction efficiency and economic benefits. The research shows that the prestressed reactive powder concrete box girder with corrugated steel webs has the advantages of light structure and convenient construction, and has superior mechanical properties and obvious economic benefits when it bears the equivalent external load of prestressed corrugated steel web concrete composite girder.
Research on the Measurement Method of Key Shape and Position Errors of Hemispherical Harmonic Oscillator
Authors: Zhao Yuqian , Li Fei , Liu Kexian , Liu Junfeng , Lai Tao 
Published: April 2023

Abstract
Hemispherical resonance gyroscope originated in the 1960s. With its outstanding advantages of high precision, simple structure and long service life, it is increasingly widely used in aerospace, tactical weapons and other fields. The hemispherical resonator, the core part of the gyroscope, is a thin-walled part with high steepness curved surface and hard and brittle material. Limited by the current processing level, it is difficult to obtain good shape and position accuracy, resulting in uneven mass distribution and frequency cracking, which affects the accuracy of the gyroscope. Based on the precision machining of hemispherical resonator, this paper carries out the research on the measurement method of shape and position error, focuses on the measurement method of the roundness and end face of the resonator, uses the cylindricity meter to complete the measurement of the roundness error of the inner and outer hemispherical shell of the resonator, and uses the white light interferometer and the subaperture stitching technology to realize the measurement of the full aperture surface of the end face of the hemispherical shell. This work provides theoretical guidance for subsequent processing and is of great significance to improve the quality of harmonic oscillator.
Jet Formation Characteristics of the Reactive Material Composite Liner Shaped Charge
Authors: Li Hongda , Liu Chengzhe , Chen Tinghao , Li Peipei , Duan Hui , Zhang Zhili 
Published: April 2023

Abstract
The formation characteristics of reactive material (RM) composite jet were studied by finite element software AUTODYN. The effect of diameter and thickness ratio, and cone angle of the liner on the tip velocity of composite jet and effective jet length were investigated. In numerical simulations, with increasing of the ratio of liner diameter, the ratio of liner thickness and the liner cone angle, the tip velocity of the composite jet decrease. With increasing of the liner cone angle, the effective length of composite jet decreases. But it is almost independent of the liner diameter and thickness ratio. When the liner diameter ratio is 0.6-0.8, the liner thickness ratio is 0.1-0.2, and the cone angle of composite liner is 60°-80°, the comprehensive performance of the RM-composite jet is better.
Large Eddy Simulation of Hydrofoil Tip Leakage Vortex
Authors: Hu Zilong , Pan Jiale , Tao Ran , Wu Yanzhao , Zhu Di , Xiao Ruofu 
Published: April 2023

Abstract
The axial-flow turbomachinery is important in water supply and drainage. However, there is a gap between the blade tip and the casing, which is easy to cause tip leakage vortex. Tip leakage of axial-flow turbomachinery has bad impact on the operation stability. In this case, the numerical simulation is used to study the simplified hydrofoil model with clearance. Then the change of tip leakage vortex core position and the pressure distribution are analyzed. Results show that with the fluid flows downstream, the longitudinal position of the tip leakage vortex core first drops and then rises. On different streamwise planes, the vortex core has the lowest pressure. From the downstream to the vortex generating position, the vortex core pressure decreases gradually, and the cavitation is most likely to occur at the location where the vortex occurs.
Preparation and Photocatalytic Properties of TiO2/MoS2 Composites
Authors: Yang Yanning , Wang Bangfu , Fan Yu , Ding Chen , Zhang Fuchun , Wang Haijun 
Published: April 2023

Abstract
The use of semiconductor photocatalysts to degrade organic pollutants and convert them into useful chemical energy is a promising technology to solve environmental problems. MoS2 and TiO2 have matching band structures. In this work, detailed characterization showed that TiO2/MoS2 complexes were synthesized by the hydrothermal method. It effectively increases the separation rate of photogenerated electron-hole pairs. In this paper, the photocatalytic degradation of rhodamine B (Rh B) by TiO2/MoS2 composites with different proportions under visible light was studied. The results showed that the Mo/Ti ratio would affect the photocatalytic activity. The composite had the best catalytic performance when the Mo/Ti ratio was 2:1. Compared with the intrinsic TiO2, its degradation rate increased by 60.28%.
Preparation and Characterization of Hydroxyapatite Nanotubes
Authors: Wu Jinan , Qi Liang , Nan Xiangkai , Sun Cuicui , Zhang Haijun , Qi Meili 
Published: April 2023

Abstract
As the key mineral component of human bones, hydroxyapatite (HA) has grasped much attention due to its outstanding biocompatibility, bioactivity and osteoconductive properties. Among different morphologies of HA materials, the special structure and good performance of HA nanotubes has been the focus of many scientific researchers. HA nanomaterials with hollow tube shapes have a relatively high surface area, low density and good mechanical property. However, the simple and convenient procedure to synthesize well distributed HA nanotubes is still rare. In this article, HA nanotubes with tens of nanometers in diameter and hundreds of microns in length were successfully synthesized via a simple solvothermal route. Calcium oleate and sodium hexametaphosphate are selected as the calcium source and phosphorus source, respectively. The surface structure of the HA nanotubes was observed under a scanning electron microscope. The synthesized HA nanotubes can be used in the area of adsorption, drug delivery and treatment of disease.
A Preparation Method of Ag-Decorated Cotton Fabrics with High Antibacterial Efficiency
Authors: Ma Hua , Li Minwei , Wo Zihao , Su Yier , Zhang Xiwen 
Published: April 2023

AbstractIn the present study, antibacterial cotton fabrics loaded with silver nanoparticle were prepared. The fabrics were first treated by plasma and alkaline solution to improve their reactivity. Then silver oxide nanoparticles were loaded on the fabrics by ultrasonic spray treatment. Finally, the fabrics loaded with silver nanoparticles were obtained by reduced the silver oxide in-situ via H2DBD cold plasma. The samples were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. The results indicate that nanoparticles loaded on the final samples are fine, uniform and exist in the form of metallic state. The antibacterial performance of the samples was evaluated and the results indicated that the samples had antibacterial activity against bothEscherichia coliandStaphylococcus aureus. Therefore, the antibacterial fabrics prepared by this method have a potential application prospect in the medical fields.
Peak Stress of FRP-Confined Concrete Columns with Circular and Square Sections
Authors: Liang Meng , Chen Junwei , Ju Haoxue , Wang Yong 
Published: April 2023

Abstract
Fiber reinforced polymer (FRP) has been extensively used to strengthen concrete columns. It is necessary to establish peak stress model with high prediction accuracy for FRP-confined concrete columns. A theoretical peak stress model of actively-confined concrete is proposed based on Jefferson’s failure criterion. And a peak stress model for columns with circular sections (or concrete cylinders) is developed via the above theoretical model. By introducing the corner radius ratio ρ, a novel strength model for square concrete columns (or prisms) is further established. The proposed peak stress models are in good agreement with the experimental data covering the range of cylinder diameter D = 76 mm-610 mm, prism’s side length B = 100 mm-400 mm and the unconfined concrete strength f’c0 = 19.4 MPa-169.7 MPa. The established peak stress models are efficient due to the simpler expressions and high prediction accuracy.
A Quick and Convenient Route to Prepare Hydroxyapatite Porous Microspheres
Authors: Liu Yang , Qi Liang , Wang Ziqi , Zhao Yanwei , Zhang Haijun , Qi Meili 
Published: April 2023

Abstract
Due to the big specific surface area, good flowability and absorption ability, porous spherical HA materials have received extensive attention of the researchers. However, the facile and convenient synthesis of well-rounded HA microspheres with a porous structure is rarely reported. What’s more, the size of HA microspheres was usually less than 10 μm. In this study, by employing hexamethylenetetramine (HMT) as the pH regulator, hydroxyapatite (HA) microspheres with good uniformity and a diameter of 30-150 μm are successfully fabricated by a one-step hydrothermal homogeneous precipitation method. To our knowledge, the synthesis of such HA microspheres by using HMT has not been reported yet. Results show that the initial pH value plays a key role in regulating the morphology of the final products and the optimal initial pH value to obtain well-rounded HA microspheres with a porous structure is 3.0-4.0, especially around 4.0. The obtained HA microspheres can be utilized as effective drug carriers for biomedical field.
Design and Simulation of Two Stage Reduction Wheel-Edge Drive System
Authors: Shi Peilei , Xu Liang 
Published: April 2023

Abstract
The distributed driving system with electric wheel as key feature has become a major research issue in new energy automobile. However, wheel-edge driving system with reducing gear may cause significant increase of unsprung mass due to introduction of motor and reducer, which is negative to the vehicle maneuverability. As a result, this paper proposed a structural design of two stage reduction wheel-edge driving system which can convert unsprung mass into sprung mass, and established 1/4 three degree-of-freedom vertical vibration system model. Through simulation analysis, the effectiveness of such design was verified. Results showed that two stage reduction wheel-edge driving system can effectively suppress vertical vibration amplitude of automobile body, reduce vehicle dynamic tire loads, and increase riding comfort and tire ground adhesion.
Extruded 3D Printing Assisted Electrochemical Additive Manufacturing
Authors: Liang Yongqi , Xu Teng , Zhang Haiqing , Shi Shaoqi , Zou Yang , Yang Zefeng , Cheng Yuchuan , Li Zhixiang , Xu Gaojie 
Published: April 2023

Abstract
This essay investigates an additive manufacturing technique of an extruded 3D printing-assisted electrochemical deposition. The effects of solutions with different additive (Cl− and brightener) concentrations on the surface micromorphology and deposition rate of the formed films were investigated by using characterization data from test tools such as an electrochemical workstation, X-ray diffractometer, and scanning electron microscope, as well as discussing the laws of interaction between these two additives during the electrodeposition process. The experimental results show that when the concentration of Cl− in the copper plating solution is 2×10−3 mol/L and the brightener concentration is 10 ml/L, the electrodeposition experiments yielded deposited copper films with a significantly preferred orientation on the (111) crystal plane, and the prepared copper film has thicker deposited film and better surface quality. To validate the additive manufacturing method for extruded 3D printing-assisted electrochemical deposition, deposition experiments of 25-layer copper samples were carried out utilizing the best process parameters.
Failure Analysis of Ф73.02 mm × 5.51 mm S13Cr 110 Tubing Collapse in an Oil Field
Authors: Kuang Xianren , Hu Fangting , Fan Yujie , Li Kun , Jia Haidong 
Published: April 2023

Abstract
The field service conditions of a well’s collapse tubing were investigated, and the physical and chemical properties of metal materials (chemical composition analysis, mechanical property test, metallographic structure analysis of tubing materials), hydrogen sulfide stress corrosion cracking test of tubing materials, and scanning electron microscopy analysis of tubing cracks and fracture surfaces were tested in this paper. The results show that the major cause of tubing collapse is that the tubing material is super 13Cr (S13Cr). When it is used in the environment containing hydrogen sulfide, plenty of longitudinal stress corrosion cracks is generated on the inner wall, which greatly reduces the actual anti extrusion ability of the tubing. During the gas lift of the well in the later stage, the upper part of the oil pipe was blocked and the oil jacket was in series, and the gas lift pressure was transmitted into the oil jacket annulus, so that the pressure difference between the inner and outer parts of the oil pipe exceeded its actual anti extrusion capacity and collapse failure occurred.
Parameter Study of Purification of Low- to Medium-Grade Bentonite from Keerjian
Authors: Deng Lirong , Lu Yufeng , Dong Yongwang , Qin Jun , Li Shasha 
Published: April 2023

Abstract
In this paper, low- to medium-grade bentonite derived in Keerjian of Toksun county were characterized. A method combined by chemical dispersion and high-speed centrifugation was used for the purification of the bentonite. Absorption of methylene blue and X-ray diffraction analysis were used to evaluate the effect of purification methods. The result showed that the optimal slurry solid-liquid ratio, dispersant amount, sedimentation time, centrifugal speed, and time of centrifugation was 1:8, 1.2% of the bentonite mass, 24h, 2000 r/min, and 5 min, respectively. The investigation provided experimental evidence for the better development and application of bentonite in this mining area.
Effect of Tempering Temperature on the Structure, Morphology and Electrochemical Performance of LiNi0.5Mn1.5O4
Authors: Li Long , Li Shubo , Xi Quanfang , Zhao Qiaoli 
Published: April 2023

Abstract
LiNi0.5Mn1.5O4, the cathode material for 5V lithium ion batteries, was synthesized through the coprecipitation-combustion process in air. The effect of tempering temperature on the structure, morphology and electrochemical performances were investigated. The phase and electrochemical properties of the samples were characterized by powder X-ray diffraction, scanning electron microscopy and constant current charge-discharge tests. The experimental results indicate that the samples tempered at 800°C-900°C all have spinel structure, with the increase of tempering temperature, the crystallinity and grain size of the sample increase.The sample tempering at 850°C has well-developed crystals, moderate crystal size and the best electrochemical performance.
Fracture Analysis of Butt Welding Area of 5″ Drill Pipe Internal Thread End in an Oilfield
Authors: Hu Fangting , Zhao Mifeng , Geng Hailong , Feng Shaobo , Du Fenghui , Kuang Xianren 
Published: April 2023

Abstract
This paper tested fracture morphology analysis, mechanical properties and chemical, metallographic analysis and micro analysis to find out the factors of fracture in the butt welding area of the internal thread of the 5″ drill pipe, which is made of S135 in the casing pulling process of an oilfield. The results show that the chemical element, tensile strength and yield strength, impact performance, metallographic structure, inclusions in microstructure and grain size of the Fracture drill pipe meet the relevant data of the oilfield and industry standards, but the hardness of the fracture does not meet the requirements of the national standard. The important reason of the fracture of the drill pipe is that the oxide skin was not cleaned before the drill pipe joint was welded with the body. During welding, the oxide skin entered the molten weld metal, and large slag inclusions formed in the weld resulted. The secondary cause is improper subsequent heat treatment of drill pipe weld, which leads to increased weld brittleness and accelerated crack growth. This paper puts forward corresponding countermeasures to improve the quality of the drill pipe’s weld and prevent the failure accidents of drill pipe.
Study and Application of Remote Control Crawler Drilling Car for Mine Roadway
Authors: Wang Hongli , Jia Hongjun , Wang Shuyue , Cheng Wenquan , Lv Baoping , Song Lixin 
Published: April 2023

Abstract
With the rapid development of mining technology in coal mines, the technical requirements for safe production in coal mines are constantly improving. In addition, it is affected by the geological conditions of the coal mine, the section of the roadway and the manpower reduction. There is an increasing demand for automatic and intelligent equipment for coal mine. A crawler-type double-arm rock drilling car which can be operated by wireless remote control is developed. It can be operated by remote control and adjusted manually. It can not only drill small diameter ordinary boreholes, but also drill large boreholes with diameter of 100-120 mm. It can effectively solve the problem of larger free surface in straight-hole cutting blasting. It is safe in operation and high in excavation efficiency.
Study on Corrosion Fatigue Properties of the Welded Joints of SMA490BW Weathering Steel
Authors: Wang Qiuying , Qiu Peixian , Chen Beiping , Wu Xiangyang , Duan Weijun 
Published: April 2023

Abstract
The polarization curve test and corrosion fatigue test of SMA490BW weathering steel welded joints for high-speed train bogies were carried out by electrochemical workstation and fatigue testing machine, respectively, and the fatigue fractures were observed and analyzed by scanning electron microscope (SEM). The results show that: The mechanical properties of the SMA490BW weathering steel welded joints welded by MAG welding are good, the tensile strength is 519MPa, and the elongation after fracture is 26.67%. In 3.5wt% sodium chloride solution, the self-corrosion potential of the heat-affected zone is the lowest, the self-corrosion current density is the largest, and the corrosion resistance is the worst, the weld is in the middle, and the base metal is the best. The corrosion fatigue limit of SMA490BW weathering steel welded joints in 3.5wt% sodium chloride (NaCl) solution is 236.55MPa, which is much lower than the fatigue limit of 335.22MPa in air. SEM fracture analysis showed that the fatigue cracks of the joints in the air originated from the weld pores, while the corrosion fatigue cracks originated from the pitting pits on the surface of the specimens.
Numerical Analysis of Flow Field and Aerodynamic Noise in Intake Structure
Authors: Liu Hongda , Sun Dan , Sun Jingguo , He Jianyuan 
Published: April 2023

Abstract
The CFD numerical simulation was used to simulate the flow field and sound field of the intake system, combined with the acoustic finite element method. Based on the Lighthill acoustic analogy and the Möhring acoustic analogy method, the internal sound source distribution of the intake system, the intensity of the nozzle noise and the acoustic directivity were analyzed. Improvement measures were proposed from the perspective of noise transmission, and the influence of different wall thicknesses on the wall stimulated radiation noise, as well as the effects of attaching sound absorbing materials and spraying damping materials on wall radiation noise were studied.
Preparation and Photocatalytic Properties of Phosphotungstic Acid SiC Composites
Authors: Wang Xin , Zhang Danfeng , Hu Lin 
Published: April 2023

Abstract
Four kinds of PTA SiC photocatalysts with different proportions of PTA were prepared by impregnation from phosphotungstic acid (PTA) and SiC. The photocatalyst was characterized by UV-Vis diffuse reflectance spectroscopy, X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. Rhodamine B (RHB) was used as degradation substrate to investigate the photocatalytic degradation performance of the photocatalyst. The results show that the prepared photocatalyst maintains both the support structure of SiC and the Keggin structure of PTA. PTA SiC with 40% mass fraction of PTA had the best photocatalytic degradation performance. When exposed to light for 180 min, RHB can reach 66% of the degradation efficiency and the photodegradation reaction rate constant was 5.21×10−3 min−1. As an active substance, hydroxyl radical plays a decisive role in photocatalytic degradation of RHB.
A Prediction Model for Recycling Amount of Recycled Metal from Waste Power Battery
Authors: He Sichao , Hu Song , Wu Shuanghe , Wang Pan 
Published: April 2023

Abstract
Dependency on importing lithium, nickel and other battery metal resources is increasing. It has an impact on the safety of the supply chain of NEV power batteries. Therefore, ensuring supply of key metal resources is of great necessity to China’s NEV industry. The valuable metals Li, Ni, Co, Mn can be extracted from waste power batteries through recycling, which is conducive to reducing China’s dependence on foreign metal resources. In this paper, a model was established to predict the recycling amount of regenerative metal for power batteries in China. Meanwhile, the influence of regenerative metal on the production and supply of power batteries was analyzed. The results show that the contribution of renewable materials to the supply of Li, Co, Ni and Mn will gradually increase from 4%-7% in 2021 to 19%-54% in 2030 as the number of power batteries decommissioned increases from year to year. Under the background of carbon neutrality, waste power batteries will be used as a reserve of key metal resources, and become an important resource to be seized by major battery manufacturers and vehicle manufacturers.