bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on High Temperature Tensile Properties and Microstructure of a Tial-Based Alloys
Authors: Yu Qiqi , Wen Daosheng , Wang Shouren , Xia Dianxiu , Yang Xuefeng , Wang Gaoqi 
Published: December 2019

Abstract
The high temperature tensile test of a Ti-45Al-5Nb alloy was carried out at deformation temperatures of 880 °C and 1000 °C, with strain rates of 0.001 s−1 and 0.0125 s−1, respectively. Scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD) were used to analyse the microstructure of different tensile parts. The results showed that under the deformation conditions of 880 °C / 0.001 s−1 and 880 °C / 0.0125 s−1, the alloy underwent brittle fracture, and microstructure was basically unchanged, compared with the original one. Deformed at 1000 °C/0.001s−1, the alloy exhibited plastic deformation and mixed brittle and plastic fracture. Dynamic recrystallization was the main softening mechanism, and the γ phase and B2 phase contents increased by 6.7% and 190.2%, respectively, compared with that deformed at 880 °C/0.0125s−1.
Static and Fatigue Properties of Scarf Patch Repaired Composite Laminates: An Experimental Study
Authors: Guan Weishi , Su Yuru , Tong Gang 
Published: December 2019

Abstract
In this paper, the static and fatigue properties of prepreg scarf-repaired composite laminates and wet layup scarf-repaired composite laminates are investigated experimentally.The results show that the patch debonding of the specimens with prepreg scarf-repaired is less than that of wet layup scarf-repaired. At the average strength of prepreg scarf-repaired specimens is higher than that of wet layup scarf-repaired.The strength of specimens is heavily influenced by the inflfailure mode. The strength of the specimens with a same fracture surface on the upper and lower surface in test region is highest while strength is slightly decreased when the fracture surface is different on the upper and lower surface, and the strength is lowest when the specimens fail in the clamping area or near the clamping area Fatigue has little effect on the specimen stiffness, failure strain, failure strength, debonding of repaired patch and failure mode of specimens.
Research on China’s export cross-border e-commerce ecosystem: a case study of Dunhuang Network
Authors: Zuo Yanan 
Published: December 2019

Abstract
With the development of cross-border electronic commerce, the main body involved is also increasing. This paper studies the ecological system of China’s export cross-border e-commerce from the perspective of ecological chain, and analyzes the relationship between China’s export cross-border e-commerce enterprises, enterprises and the environment. Through the analysis of DHgate, the sixth online foreign trade transaction e-commerce website in the world, this paper points out that the service community is the basis for the expansion of the cross-border e-commerce ecosystem, and the close connection between the trading community and the supporting community determines the velocity of the material and energy cycle of the ecosystem, and there is a symbiotic relationship between the trading, service and supporting community. Finally, this paper puts forward the preliminary idea of the formation of export cross-border e-commerce ecological Circle, which provides the direction for the follow-up research.
Design Method of Jacket Foundation for Tidal Current Turbine
Authors: Jia Fayong , Chu Jingchun , Yuan Ling , Pan Lei , Wang Ting 
Published: December 2019

Abstract
Nowadays, it is a main utilizing mode to generate electric power using tidal current energy, which has been getting rapid development worldwide. Jacket foundation, as a main foundation type, plays an important role to ensure the safety of the tidal current turbine. Thus, a design method of jacket foundation for tidal current turbine is a research focus. In the paper, The SACS-Tidal-bladed joint design method combined SACS, a design tool for offshore engineering, with Tidal-bladed, a load analysis tool for tidal current turbine, is put forward. The method mainly consists of three key design cases, namely mode analysis, ultimate limit analysis and fatigue analysis. Moreover, the jacket foundation for a 2×300kW tidal current turbine is designed using the method. Because the results are satisfied to the relevant specifications, the running safety of the 2×300kW tidal current turbine with the jacket foundation can be ensured.
Simulation of Contact Characteristics for Expandable Mechanism of Shelter Based On Multi-Grid Method
Authors: Li Linlin , Jin Wenli , Qi Baoyun 
Published: December 2019

Abstract
With the increasing demands of the diversified expandable shelter and its reliability of structure in modern society, the requirements of the transmission mechanism that affects the deploying and withdrawing of shelter are also getting higher. At present, there are few studies on the mechanical characteristics of its contacts. In this paper, the contact model of the expandable mechanism of shelter under the elastohydrodynamic lubrication (EHL) condition is established based on the multigrid method. The algorithm is implemented on the platform of MATLAB, and effects of the load, velocity and lubricant viscosity on the contact characteristics of the expandable mechanism are analysed. The results show that the performances can be improved by reducing the external load and increasing properly the velocity and lubricant viscosity. The research in this paper can also provide theoretical reference for design of the expandable mechanism of shelter.
Application of Finite Difference Domain Decomposition Method in Heat Conduction in Three-Layer Insulation Suit
Authors: Yang Lizhi , zhang Peng , Cao Jiahao 
Published: December 2019

Abstract
When working in a high temperature environment, people need to wear special clothing to avoid burns. The special clothing is usually composed of three layers of fabric materials, which are referred to as layers I, II and III. Layer I is in contact with the external environment directly. And there is also a gap between the layer III and the skin. We considered this gap as the layer IV. Firstly, it is assumed that heat balance exists between the air layer and the I layer, and between the IV layer and the dummy skin respectively. According to the experimental data of the outer skin temperature of the dummy and the principle of heat transfer, the heat exchange coefficient between the IV layer and the outer side of the skin is 0.0047. Using the heat balance relationship, the inner wall temperature of layer I is deduced, and the heat exchange coefficient between the air and the layer I is 0.0049. Secondly, the boundary conditions of the heat conduction model are obtained based on these heat exchange coefficients. And the one-dimensional heat conduction model of this special clothing is established. Since the medium of each layer of the special clothing is different, the diffusion coefficient of the equation is a piece-wise function. Combined the boundary conditions, we uses the implicit algorithm to obtain the discrete difference equations and ensure the stability of the numerical format. Finally, the temperature values of different space-time distributions are obtained.
Research on Mechanical Behavior of Prefabricated I-Section Reinforced Concrete Slab Girder
Authors: Li Pengfei , Mao Yan , Dong Zhenhua , Wang Xian 
Published: December 2019

Abstract
Cracks, water seepage and other damage often occurred in the hinge joints of the fabricated hollow slab bridge and affect the transverse integrity of the bridge. In order to solve these problems, a new type prefabricated I-girder is proposed, the girder is connected crosswise through wet joints, and the distributed bars extending from the flange are firmly connected in the wet joints. The wet joint has replaced the hinge joint in the traditional hollow slab structure. Through the static load test of the three-piece fabricated I-section slab girder model, the overall mechanical behavior and the transverse distribution of the load in the fabricated I-section slab girder bridge are studied. Then the dynamic characteristics and overall mechanical properties of the traditional hollow slab girder bridge and the fabricated I-girder bridge with equivalent section was analyzed by MIDAS, consider the influence of shallow hinge joints, middle hinge joints and deep hinge joints. The experimental results are compared with the numerical analysis results, the results show that, under the condition of equivalent section, the overall flexural stiffness and torsional stiffness of the fabricated I-section slab girder structure are greater than that of the traditional hollow slab structure, and the transverse distribution of the load is more uniform, the fabricated I-section slab girder structure has better mechanical performance.
Effect of Mg Doping On Electrochemical Properties Lini1/3Co1/3Mn1/3O2 for High Performance Cathode Material in Lithium Batteries
Authors: Li Lin , Cheng Jinsong , Liu Qing , Wang Ting , Zhao Rongfei 
Published: December 2019

Abstract
The Mg-doped LiNi1/3Mn1/3Co1/3O2 cathode materials have been successfully synthesized via a rheological phase reaction method. The structure and properties of the as-obtained samples were measured by XRD, SEM and electrochemical test methods. Though the Mg-doped samples delivered lower initial capacities, the rate performance and the cycling stability were dramatically enhanced. The Mg2+ doped LiNi1/3Mn1/3Co1/3O2 sample (1%) has the most excellent electrochemical performances, it delivers an initial discharge capacity of 177 mAh g–1 at 0.2 C in the voltage of 2.5–4.5 V, and has a capacity retention of 97.7% after 50cycles.
Study on the Properties of Rubber with Different Contents of Carbon Black
Authors: Li Yi , Zhu Pengxiao , Zhang Qiong , Chen Bo , Zhu Zhifeng 
Published: December 2019

Abstract
In this paper, the rubber with different carbon black content was designed and its properties were tested to verify its effects on rubber properties. The results showed that with the increase of carbon black content, the hardness of rubber increased gradually, and the tensile strength, elongation and tear strength firstly increased and then decreased. The abrasive volume of vulcanization firstly decreased and then increased along with carbon black content. The heat generation of rubber increased slowly between 10 and 20 parts of carbon black content, while the heat generation of rubber increased rapidly between 30 and 40 parts of carbon black content. After thermo-oxidative ageing at 75°C for 96 hours, the hardness, tensile strength, elongation and tear strength of the rubber decreased to varying degrees. The properties of the rubber with carbon black content decreased rapidly between 10 and 20 parts, while the properties of the rubber with carbon black content between 30 and 40 parts decreased slowly.
Improvement of Synthetic Method of Lysine Aspirin
Authors: Chen Kun , Zhu Xin , Tian Qikang , Zhang Lan 
Published: December 2019

Abstract
The synthesis method of lysine aspirin was improved, and the new method was applied to the synthesis of similar new drugs. Aspirin is reacted with an aqueous solution of sodium hydrogen carbonate to prepare its sodium salt, and lysine was reacted with a sodium salt thereof in water to prepare lysine aspirin. The product was identified by melting point, infrared spectroscopy and high performance liquid chromatography; the cysteine salts of aspirin was prepared by this method, and the product was identified by micro melting point apparatus and infrared spectroscopy. Lysine aspirin was synthesized by the reaction of sodium acetylsalicylate with lysine. The author measured the melting point and infrared absorption spectrum of the cysteine salt sample of aspirin, which was initially determined to be possible. The new method offers the possibility to expand the production route of lysine aspirin, and also provides new ideas for the preparation of similar new drugs.
Assembly construction quality detection based on dynamic characteristics of composite component
Authors: Yin Zhen , Qin Lei 
Published: December 2019

Abstract
At present, composite slabs in our country have been widely used. There are few studies on the dynamic characteristics of assembled composite slabs in the existing literature. In this paper, the time history curve and amplitude spectrum of ribbed pre-stressed concrete composite slabs have been measured in the field, and the frequency changes in their dynamic characteristics have been analysed with YSV dynamic signal acquisition and analysis system. The reasons affecting the dynamic characteristics of ribbed prestressed concrete composite slabs are analysed, and the first six modal frequencies of ribbed prestressed concrete composite slabs are obtained, which lays a foundation for the construction quality inspection of ribbed prestressed concrete composite slabs.
Oxidation characterization of M2 powders exposed under humid atmosphere for a long time
Authors: Liu Hengsan , Wang Miaohui , Xu Yifei , Ge Xueyuan , Liang Jinming 
Published: December 2019

Abstract
Atomized M2 powders were stored in an atmosphere of 80% relative humidity for a long time. The oxidation characteristics of atomized alloy powders were analyzed. The results show that the oxygen content of the powders have an increasing trend with the prolongation of storage time under humid atmosphere. The oxygen content of 150-300 mesh coarse powder has a gentle change, and the oxygen content will be reduced to near the original level after drying. The oxygen content of -300 mesh fine powders has a little growth in a short time, but it increases rapidly as time goes on after one week, and increases from 415 ppm to 1098 ppm after four weeks of storage, and the oxygen content of fine powders after drying remained unchanged. Particle size has a great influence on the oxidation characteristics of powders. The smaller the particle size, the greater the oxygen content of the powder. The type of adsorption of oxygen element from coarse powder to fine powder changes from physical adsorption to chemical adsorption.
Investigation on anti-penetration performance of reinforced concrete targets based on ANSYS/LS-DYNA
Authors: Cheng Yi 
Published: December 2019

Abstract
Based on the perforation experiment carried by S.J.Hanchak et al, the finite element method (FEM) model of the reinforced concrete (RC) target was set up. After obtaining the residual velocities of a projectile, the feasibility of this model was verified. On this basis, the effects of the inclination angle and impact position on the penetration resistance of the RC target were analyzed by ANSYS/LS-DYNA. Besides, three targets compared their penetration resistance with the RC target according to residual velocities and target damages. Three main conclusions were drawn: (1) the plastic deformation of the first and third steel layer is intensified with the inclination angle increasing, and the projectile kinetic energy is dissipated more, which improves the penetration resistance of the RC target;(2) the penetration resistance of the RC target is aggravated by the impact position at a high reinforcement ratio (3%), especially when impacting at the crossing point of steel bars;(3) based on the same condition, the anti-penetration performance of four targets is listed as follows: SC target > RC target ≈ SSC target > Concrete target.
Effect of Electron Beam Annealing Duration on the Properties of Zno Thin Films
Authors: Li Yanli , Han Li , Kong Xiangdong 
Published: December 2019

Abstract
The effect of electron beam (EB) annealing duration on the properties of pure ZnO thin films was studied. Pure ZnO precursor films prepared by sol-gel spin coating method were directly annealed by EB for different duration from 20 s to 480 s. The structural, optical and electrical properties were investigated. XRD patterns show (002) preferential growth for all the ZnO films. SEM results reveal that the average grain size changes from ∼10 nm to ∼70 nm with the increase of annealing duration and AFM results show the surface RMS roughness is less than 3 nm. The optical transmittance spectra present the absorption edge of the films is at about 380 nm and the average transmittance is more than 85% in visible region. It’s exciting to find that the ZnO film annealed for only 120 s exhibits resistivity 2×10−2 Ωcm and carrier concentration as high as 5.5×1019 cm−3, which shows an advantage of EB annealing in the preparation of ZnO transparent conductive films.
Study on Preparation and Properties of Unburned Ceramsite With Steel Slag
Authors: Yu Qiaodi , Li Canhua , Wang Zhaoran , Deng Aijun 
Published: December 2019

Abstract
Using steel slag, fly ash and clay as physical materials, cement, expanded perlite and methyl cellulose as additives, the raw materials were ground, bullied, aged, cured and prepared into lightweight and high strength ceramsite. The effects of steel slag, fly ash, clay and cement on the packing density and cylinder compression strength of unburned ceramsite were studied by single factor variable analysis, and the optimum mixing ratio of hot stuffing steel slag, air-quenched steel slag and other raw materials was also studied. Finally, the ratio of fly ash to clay is 40:50:10 and the optimum content of cement is 10%. The content of expanded perlite is 2%. The content of methyl cellulose is 1%. The accumulation density of unburned ceramsite is 943.5kg/m3, and the compressive strength of the tube is 8.153 MPa. Through scanning electron microscope (SEM) and energy spectrum analysis, the microstructure of ceramsite has many small and irregular vitreous composition, most of which are composed of silicate and carbonate. Loose and porous cellular structure is formed between vitreous body and vitreous body, which leads to small volume density of ceramsite.
Synthesis of 1-methyl-3-(5-nitropyridin-2-yl) urea
Authors: Zhang Binliang , Lai Luogen , Feng Pan , Xu Shan 
Published: December 2019

Abstract
1-methyl-3-(5-nitropyridin-2-yl) urea (8) is an important intermediate for small molecule anticancer drugs. A rapid and high yield synthetic method for 1-methyl-3-(5-nitropyridin-2-yl) urea (8) was established in this work. The target compound was synthesized from the commercially available 2-chloro-5 -nitropyridine (5) through multi-step nucleophilic reactions.The structure of the target product was confirmed by 1H NMR. In addition, the synthetic method was optimized. The total yield of the four steps was high up to 92%.
Numberical Simulation and Process Research of Laser Cladding on 738H Injection Mold Steel Surface
Authors: Jia Yunjie , Lou Liyan , Wang Linning , Cai Yujun 
Published: December 2019

Abstract
Laser cladding coating is the focus of development in the field of die repair. It has the characteristics of uniform and compact coating, good bonding strength, little thermal impact on the substrate, and easy to realize automation. FeCr alloy coating was prepared on 738H die steel by laser cladding process. Based on MSC Marc finite element software and life-and-death element method, the numerical analysis model of laser cladding repair was establelished, and the temperature field, stress field and deformation under different process parameters were solved. According to the simulation results, the cladding process was formulated, the hardness and linear thermal expansion coefficient of the cladding coating were characterized, and the effects of the process parameters on the structure and properties of the coating were studied. The cladding coating matched well with the substrate performance was obtained, and the high quality repair of the die surface was realized.
Effects of Solution Heat Treatment on Laves Phase and Corrosion Behaviors in Selective Laser Melted Inconel 718 Alloy
Authors: Zhang Qiang , Li Huixiang , Yang Yousheng 
Published: December 2019

Abstract
Effect of solution heat treatment on microstructure and electrochemical corrosion behaviors were investigated for the selective laser melted (SLM) Inconel 718 superalloy. Electrochemical results showed that solution treatment Inconel 718 has lower corrosion current density and bigger radius of the capacitive loop than as-deposited Inconel 718, means that the solution heat treated Inconel 718 has superior corrosion resistance than as-printed Inconel 718. Microstructure studies suggested that Nb-rich Laves phase widely distributed in the as-deposited Inconel 718 matrix, unlike less Laves phase is exited in annealed Inconel 718. The superior corrosion resistance of the solution heat treatment Inconel 718 could be elucidated by the removed Laves phase.
The Study of Titanium Alloy Precision Casting Turbine Blades Based On Procast
Authors: Dai Hailin , Zhang Chengli , Zhao Qian , Zhu Hang 
Published: December 2019

Abstract
The software ProCAST which is based the Finite Elements Method is used to simulate the process of TiAl casting. Ti-47Al-2Cr-2Nb alloys will be used in the casting. As a result, we have known the characteristic of the alloys, flowage and solidification, and we also have forecast the quantity and distributing of defect in the casting.
Study on Novel Heterogeneous Packaging Material and Housing Design for Spaceborne T/R Module
Authors: Jiang Shouli , Leng Tongtong , Li Jia , Zhong Jianfeng , Gu Yeqing , Wang Richu 
Published: December 2019

Abstract
A novel double-layer structure heterogeneous packaging material SiCp/Al+Si/Al was proposed. The packaging shell of X-band active phased array radar transmit/receive module for aerospace was developed. The deformation control, heat dissipation and anti-mechanical environment analysis of micro-assembly welding process were studied. The test and analysis results show that, compared with conventional materials, it has less deformation in the welding process with low temperature co-fired ceramics printed circuit boards. It has the advantages of laser capping, low expansion, high thermal conductivity and high reliability, and can meet the requirements of spaceborne power module packaging applications.
Design of Parallel Injection Online Compound Control System for Liquid and Water Solvent
Authors: Jiang Xingtong , Wang Zhuo , Bai Xiaoping , Xiong Feng , Li Deqiang 
Published: December 2019

Abstract
The variable spraying technology includes premixed drugs and online mixed drugs. The operators need to be in contact with pesticides in the premixed operation.It is harmful to the operators.Meanwhile it has the disadvantages of large amount of pesticides and environmental pollution. In order to solve this problem, an injection-type online mixed drug spray control system for variable spraying and width control was designed.In this paper, a novel injection-type online mixing pesticide control system is designed to solve this problem for variable spray and width control. The mixing ratio of water solvent flow and the pesticide flow is adjusted in real-time spraying by using a sprayer equipped with the proposed online mixing pesticide control system according to the specific prescription map. The concentration of pesticide at the nozzle is controllable consequently. The real-time dynamic response test and the steady state error test were carried out during the pesticide injection. Results show that the steady state error of the proposed system with using DMC strategy is no more than 5%. The uniformity of the mixed pesticide was tested under different mixing ratios of the system, and the calculated spatial variation coefficient is less than 5%. It shows that the injection-type online mixing pesticide control system has better mixing uniformity.