bluuebunny/crossref_metadata_2025_split huggingface dataset:
Progress of automatic vertical drilling systems: selection for deep wells with high temperature and pressure in China
Authors: Sun Weiguang , Song Weiqiang , Ni Hongjian , Lou Erbiao , Sun Xue , Zhang Shichuan 
Published: July 2021

Abstract
Based on the working principles of various automatic vertical drilling systems (VDS), they are divided into rotary-pushing type and slide-pushing type. Then, the technical advantages and applicable scope of the two types VDS are analysed. Thirdly, the reliability of different VDS is presented based on the latest application statistical data. Fourthly, suitable VDS are selected for a certain deep well with high temperature and pressure. Finally, the development trend of the VDS is predicted based on the analysis of typical application cases. The results show that, the existing VDS could almost meet the technical needs of rapid drilling in the middle-deep sections with high formation dip angle, although the reliability of electronic components and wear resistance of the push pad still need further improvement. New type VDS, that is miniaturized (suitable for small boreholes) and resistant to high temperature and high pressure, is in urgent need to fill the gaps in the market segment recently. Domestic independent VDS have made great progress in achieving the technical goal of anti-inclination, some even surpasses imported products in key indicators such as temperature resistance. The research results can provide support for the drilling company to optimize the VDS based on engineering-geological conditions.
Research on Thermal Simulation Improving the Components’ Soldering Quality in Electronic Module
Authors: Yang Hai , Jing Zhu 
Published: July 2021

Abstract
This paper describes a method that could exactly optimize and improve the soldering quality of the electronic module. Firstly, a sample of temperature measurement was proposed. Through the temperature rising, heat preservation, temperature rising, soldering and cooling, the sensors could able to accurately and sensibly record and present each temperature data which set on the sample. At the same time the soldering cure was also measured. Secondly, through the analysis and research of vapor-phase soldering technology based on condensation theory, referring to the relevant modeling and simulation analysis methods, a thermal simulation model was established (size: 13.7mm × 45mm × 16.5mm). The ANSYS was used in this thermal simulation and the measured temperature curve, material parameters and other boundary conditions were loaded. The transient thermal simulation method was adopted and the temperature variation on sample during vapor-phase soldering was simulated. A maximum error of 2.67°C between simulation and measurement results, error rate is only 1.2%. Therefore, this simulation method can effectively perform the change of temperature with time in the real vapor-phase soldering process. After that, the optimized vapor-phase soldering temperature curve and soldering process parameters were used to carry out the vacuum vapor-phase soldering test in the assembly. The dimensions, materials and other parameters of the components used in the test were completely consistent with the simulation model. Two Sn63Pb37 solder rings were used in the test and the vacuum was also carried out. Through the X-ray inspection results, the optimized vapor phase soldering temperature curve has no soldering voids and well soldering consistency, which meets the requirements of high-quality soldering and improves the assembly quality of electronic products.
Study on Main curvature of Stress Relaxation Modulus of a Double-base solid propellant
Authors: Jian-bin Zhang , Lei Guo , Guang-hua Li , Bing-ju Lu , Dong Cheng 
Published: July 2021

Abstract
The mechanical properties of a double-base solid propellant under quasi-static and dynamic conditions are studied experimentally. According to the time-temperature equivalence of a double-base solid propellant, the main curve of stress relaxation modulus and temperature-dependent material parameters are obtained by using the stress relaxation test results at different temperatures. Based on the analysis of the temperature spectrum of a double-base solid propellant material, the main curve of stress relaxation modulus and temperature-dependent material parameters of the double-base solid propellant material are obtained by using the equivalent principle. The results show that the dynamic test results are better. The database of the dynamic stress relaxation modulus main curve should be used as the basic parameters of the constitutive model analysis and the structural integrity analysis of the double-base solid propellant, which lay the foundation for the type selection and the structural integrity analysis of double-base solid propellant grain.
Experimental Research on the Water Spray Hole Flow Coefficient
Authors: Jian-bin Zhang , Dong Cheng , Ben-shuai Fu , Guang-hua Li , Bing-ju Lu 
Published: July 2021

Abstract
The water spray hole flow coefficient is one of the important parameters that have great effect on the calculation accuracy of the spray water quality second flow. The test system is designed on the water spray hole flow coefficient in this study. The test results are obtained on the water spray hole flow coefficient under different working conditions. The results showed that the water spray hole flow coefficient is not constant but a function for time. The water spray hole flow coefficient increase with the increase of the number of blowhole. Although the rest results have a certain error, but this study fills the blank no test results on water spray hole flow coefficient. That also provides the technical support on improving launch internal ballistic calculation accuracy of the dynamical system and model improvement.
Research on 3D printing platform of blockchain for digital spare parts management
Authors: Zhang Shucheng , Lin Zhiyu , Pan Haochi 
Published: July 2021

Abstract
In the era of digital manufacturing, 3D printing has great potential in the spare parts supply chain due to its characteristics of real-time response manufacturing. In order to improve the docking efficiency of the supply and demand sides in 3D printing, the development of 3D printing cloud platform has received more and more attention. However, the traditional 3D printing platform can neither meet the needs of rapid production in actual production scenes nor create a safe and efficient data sharing mode. In order to meet these challenges, this paper proposes a 3D printing platform based on blockchain. First of all, the production standard identification and coordination solutions of spare parts suppliers are established to carry on the rapid qualification certification to the supplier. Secondly, the blockchain technology on-chain off-chain storage scheme is developed to achieve efficient sharing of 3D printed digital files under the premise of full property rights protection. Third, the product traceability service is developed to ensure the safety and transparency of spare parts. Finally, the effectiveness of the blockchain 3D printing platform is confirmed through the development of the prototype system.
Simulation Model and Verification of Heat Transfer Characteristics in Aircraft Cabin Bulkhead
Authors: Chengyun Wu , Yi Cao , Xuhan Zhang 
Published: July 2021

Abstract
The calculation of heat transfer in aircraft bulkheads is of vital importance to the design of aircraft cabins. In this paper, a numerical model for the fluid-solid coupled heat transfer of aircraft cabin bulkhead and air in the cabin is developed, including fluid/solid area division, network strategy, turbulence model and numerical discrete method, and the model is verified based on the experimental data. The results show that the proposed model can accurately predict the wall temperature and the air temperature of the aircraft cabin with a deviation of less than 1.02°C in the working range of -15∼25°C, and the prediction deviation for the air velocity is within ±10%. The heat transfer from the cabin to the bulkhead accounts for 7.5% of the total heat transfer. The main component of the thermal resistance of the cabin bulkhead is the thicker solid area, and the inlet air temperature is the key parameter for the design of aircraft cabin. The research results provide an important theoretical basis for the optimal design of the thermal environment of the aircraft cabin.
Application of the Sub-Sea Analysis (SSA) capability in numerical simulation of underwater explosion
Authors: Zhengpeng Tang , Xiangyu Li 
Published: July 2021

Abstract
In order to solve the problem that LS-DYNA fluid-solid coupling algorithm is not suitable for remote underwater explosion simulation and improve calculation efficiency, the numerical simulation of remote underwater explosion is carried out for the subsea analysis function in LS-DYNA. The dynamic response process of ship hull girder under underwater explosive load is analyzed by comparing it with the general software AUTODYN numerical simulation. The method reflects the loading process of underwater explosion load on structure to a certain extent. The calculation speed is fast, but the accuracy is not high and the error of bubble pulsation process is large.
Research on Intelligent Comprehensive Support Technology and Application of Complex Equipment
Authors: Pengpeng Liu , Jine Huang , Yanyan Liu 
Published: July 2021

Abstract
At present, the complex equipment logistics support system often faces the situation of local logistics support capacity surplus or insufficient, which presents the disadvantages of high cost and low efficiency. The concept of equipment autonomous logistics support and perception response support emphasizes the importance of network as the center, aiming at the crucial problems of logistics support management, it puts forward that equipment logistics support management must realize full-dimension, globally controllable, wholly-owned, and end-to-end seamless integration from the equipment platform to the entire support architecture. A three-level network architecture is designed to realize real-time perception of panoramic situation through equipment technology status sensor and resource sensor, and to carry out scheduling and management through decision support system, and to organize coordinated operation of logistics manpower, support resources and support facilities.
Study on the characterization technology of hiding power of powder coating
Authors: Xue Bing , Yan Ran , Wang Can , Zhang Huayuan , Yue Yongyong , Luo Jing 
Published: July 2021

Abstract
In this paper, a method to characterize the hiding power of powder coating by dispersing powder coatings in various dispersants and brushing obtained suspension coating was studied. When colorless, transparent and low-viscosity reagents reagent, containing epoxy functional group, is used as the dispersant of TGIC polyester thermosetting powder coating, the hiding power of this kind of powder coating can be accurately determined. When the dispersion concentration of powder coating is in an appropriate range (mass fraction 32%-45%), the hiding power has nothing to do with the concentration, and the test results reflect the properties of powder coating itself.
Research on microstructure evolution and mechanical properties of steering shaft teeth after pre-heat treatment and carburizing-quenching processes
Authors: Zhang Yishuai , Wang Tao , Fu Jia , Sun Hongxing , Li Jiqiang , Liu Hua 
Published: July 2021

Abstract
The influence of pre-heat treatment and carburizing quenching on microstructure and properties in steering gear is studied. The CCT curve and TTT curve of 20CrMnTiH are calculated by JMatPro software. According to the phase transformation theory of undercooled austenite, the pre-heat treatment process is designed and the carburizing and quenching experiments are carried out in a gas carburizing furnace. Results show that the undercooled austenite begins to transform at 814.1 °C and shows unstable at 650 °C, at which the phase transformation speed is the fastest; By controlling the cooling rate of our designed air cooling system, transformation temperature and transformation time during the undercooled austenite transformation, the metallographic structure of axle teeth after pre-heat treatment can reach grade 1, with the brinell hardness distribution is 159HB-166HB and the hardness difference less than 7HB. After carburizing and quenching the carbide grade in the gear surface can reach to grade 1. The acicular martensite and retained austenite can also reach to grade 3. In the surface of the gear the hardness is 704HV. With the request of the engineering technical standard of 0.7mm-0.9mm, the effective hardened layer depth is about 0.85 mm. This research provides a technical basis for the fatherly research on distortion characteristics.
Structure and Properties of Recycled Polyester-cotton Blended Fiber/HDPE Composite Board
Authors: Huili Zhao , Chifei Wu 
Published: July 2021

Abstract
Recycled polyester-cotton blended fiber/high density polyethylene (HDPE) composite boards were prepared by internal mixing and compression molding two-step process with maleic anhydride grafted ethylene polyethylene-octene elastomer (POE-g-MAH) as compatibilizer. Two kinds of recycled polyester-cotton blended fiber were used as reinforcing fibers, including polyester-cotton long fiber (F1) and polyester-cotton short fiber (F2). Microstructure and properties of the composite boards reinforced with F1 and F2 were characterized by SEM and electronic universal tensile testing machine. The results showed that the comprehensive mechanical properties of polyester-cotton blended long fiber composite boards (F1HC4) and polyester-cotton blended short fiber composite boards (F2HC4) were optimal with a compatibilizer content of 4%. F1 had a significant effect on the mechanical properties of the composite boards in two kinds of fiber with the same addition of compatibilizer. The tensile strength, flexural strength, impact strength and of F1HC4 were 56.4%, 36.4% and 87.5% higher than that of F2HC4, respectively.
Thermal behavior test and characterization of a capsicum oleoresin (OC) composite material used for burning tear bomb
Authors: Haolong Zhai , Xiaoping Cui 
Published: July 2021

Abstract
In order to study the thermal behavior of a capsicum oleoresin (OC) composite material used for burning tear bomb, the single component and the composite (KClO3+ lactose + OC) were tested by HS-STA-002 synchronous thermal analyzer. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were performed at a heating rate of 10°C/min, the results show that the composites have good compatibility because the characteristic peaks of each component in the composites have little change compared with the relative characterization of the composites. The temperature range of the best volatilization effect of pure OC is between 250°C∼350°C; when the temperature is lower than 250°C, it is unfavorable to the thermal diffusion of OC; when the temperature is higher than 350°C, OC will undergo thermal decomposition. In the composite system, the temperature range of the best volatilization effect of OC is between 230°C∼330°C. Compared with the temperature range of the best volatilization effect of pure OC, the temperature range of OC is shifted to the left, but the range is smaller. All these findings can provide theoretical guidance for the formulation design and optimization of this kind of composites.
A Novel Handheld Device: Application to in Situ Bioprinting Compound Dressing for the Treatment of Wound
Authors: Tianyuan Yin , Yi Zhang , Zhian Jian , Yuanyuan Liu 
Published: July 2021

AbstractIn recent years, Bioprinting technologies have been advancing at the convergence of automation, digitalization, and new tissue engineering (TE) approaches, In-situ bioprinting may be favored during certain situations for skin wound healing. The main advantage of in-situ printing is that the printed wound surface has good adhesion, namely the print of dressing can full fill the defect out of the wound, can adapt to different positions (joints) of the different types of wounds. In addition, the free deposition of materials and the properties of materials are well combined with the wound surface in the printing process, sticking to the wound surface and reducing the pain caused to the injured by the process. Handheld device to achieve in-situ printing, simplifies the surgical process, portable, easy to operate, can be used in emergency scenarios. Moreover, wound healing is a dynamic and complex process that contains several sequential phases. Rapid hemostasis and continuous bacteriostasis have always been problems in wound healing. Here, we firstly propose a hand-held device that combines multiple processes (spray, extrusion, electrospinning) and is oriented to accurate wound management. Secondly, we used this device to achieved the stable film formation of a variety of materials, and has the key functions of hemostasis, bacteriostasis and promoting healing. Finally, we highlight the potential of this device for wound healing applications.
A Predictive Method of Thermal Expansion Coefficient of POSS Reinforced Silicone Materials
Authors: Wei Huazhen , Wang Danyong , Li Shuhu 
Published: July 2021

Abstract
Silicone resin can not only withstand high temperature, but also form S1O2 layer with better heat resistance after ablation at high temperature, which rarely reflects electromagnetic wave. In the manufacturing process of POSS/silicone resin, if the content ratio of POSS can be effectively controlled, the comprehensive properties of the materials can be significantly improved, many weaknesses of the composites can be improved, and the real problems such as the stiffness and strength of the wave transparent composite still need to be greatly improved can be solved. A prediction method for thermal expansion coefficient of POSS reinforced silicone materials is developed, which is convenient for engineering application. The relationship between microstructure and thermal expansion property of materials is understood systematically and accurately, so that the prediction of thermal expansion property and material design are possible.
Influence of Temperature and Concentration on Viscosity of Complex Fluids
Authors: Wenhao Zhang 
Published: July 2021

Abstract
With the spread of lubricating oils, the usage of viscosity becomes more and more significant in various industries. This essay is used to determine the relationship between viscosity and the change of concentration and temperature to avoid problems during production process. This research uses the high-degree function and exponential function to simulate the change trend of viscosity due to the two variables. Through research, the author discovered the exponential relationship between the temperature as well as concentration and viscosity of lubricating oils and other complex fluids. Based on the results of this research, the enterprise can also avoid excessive wear of the machine and high waste in the production process.
The effect of annealing temperature on Ga2O3 film properties
Authors: Zhang Xi , Jiang Dayong , Zhao Man , Zhang Haixin , Li Mingyang , Xing Meijiao , Han Jichao , Romanov Alexey E. 
Published: July 2021

Abstract
Using Radio Frequency Magnetron Sputtering (RFMS) equipment, gallium oxide (Ga2O3) films were deposited on sapphire substrates. Then the samples were annealed at 700 °C, 900 °C, and 1100 °C for 120 min in the air atmosphere to convert them into β-Ga2O3 films with different crystalline quality. The effects of annealing temperature on the properties of β-Ga2O3 thin films were investigated. The crystal structure and surface morphology were tested by X-ray Diffraction (XRD), absorption spectroscopy, and Atomic Force Microscopy (AFM). The results obtained show that, within a certain range, as the annealing temperature increases, the intensity of the XRD peaks increases, the Full Width at Half Maximum (FWHW) – decreases. The crystal grains “engorge” as the temperature rises, and the degree of crystallinity of the samples becomes better.
Effect of Zn on corrosion behaviour of biodegradable Mg-Zn-Mn alloys evaluated by FE prediction and in-vitro testing
Authors: Lu X.Z. , Chan L.C. , Zou X.J. , Lai C.P. 
Published: July 2021

Abstract
Mg-Zn-Mn (ZM) alloy shows great potential in biomedical applications due to its biocompatibility and bio-essential element composition, as well as its favourable mechanical and degradation properties. This paper aims to explore the effect of Zn on corrosion behaviour of ZM alloys via finite element (FE) prediction and in-vitro testing. Microstructure analysis showed that Zn had the grain refinement effect, and the second phase of Mg-Zn between grains increased with the increase of Zn content, which improved the mechanical properties of the alloy significantly at the cost of acceptable reduction in plasticity. After a continuum damage mechanics (CDM)-based degradation model was applied to the FE package, the corrosion process of the ZM alloys was predicted. The results indicated that the grain boundary had poor corrosion resistance while the second phase facilitated delaying corrosion expansion. Furthermore, in-vitro tests were carried out and consistent results were obtained, i.e., the grain refinement made the entire corrosion process more uniform and severe corrosion in local areas was avoided, and the intergranular second phase was beneficial to delay the corrosion process. This study suggested that Mg-Zn-Mn alloy has satisfactory mechanical strength and controllable corrosion rate, which should be a promising candidate for future biomedical applications.
Three Kinds of Novel Bioabsorbable Interface Screws: Evaluation of Mechanical Properties
Authors: Meng Xianyuan , Chen Lihua , Dong Wenxing , Shan Lutong 
Published: July 2021

Abstract
With the development of medical technology and materials science, the structure optimization method of bioabsorbable materials for implantable medical devices becomes more and more important, and the absorbable interface screw is the most representative device in implantable medical devices. Based on the previous parametric design method for the loading and structural characteristics of the interface screw, this paper assembled the interface screw and cancellous bone with the tunnel hole and simulated the graft fixation after cruciate ligaments surgery. In this study, through the finite element method, the mechanical properties of interface screws with different structural parameters obtained by parametric design were comprehensively evaluated from the aspects of stress and strain energy density.
Study on static recrystallization behavior of martensitic stainless steel
Authors: Qi Peng , Ren Facai , Xu Jinsha 
Published: July 2021

Abstract
Static recrystallization or sub dynamic recrystallization may occur during multi pass forging clearance of turbine blade. The static recrystallization behavior of martensitic stainless steel was studied by two pass hot compression test. By linear fitting the flow stress data, the parameters in the standard JMAK equation were obtained. Based on JMAK equation, the static recrystallization kinetics model of martensitic stainless steel was established. It provides a basis for the actual forging process of steam turbine blades.
characteristics of the gap-type up-rating conductor used in overhead power transmission lines
Authors: Yang Changlong , Zheng Yang , Yang Feng , Fu Zhongyuan , Xu Chao , Zhang Yang , Duo Junlong 
Published: July 2021

Abstract
This article briefly introduces the current increasing demand for electricity in China, and ordinary aluminum conductor steel reinforced will no longer meet the mand for electricity. For this reason, a new type wire, the gap-type up-rating conductor, is introduced. Under the condition of no wind and no sunshine indoors, the sag and tension of the wire under different spans is measured with sensors and analyzed. Clear and visible results based on experimental data are obtained.