bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Vibration Reduction Compatibility for Multiple Transportation Conditions
Authors: Xu Botao , Fang Zhikai , Liu Yugang , Liu Xingyue 
Published: March 2020

Abstract
Vibrations in the process of transportation are often neglected in product design. In order to avoid damage to acceleration sensitive equipment or components of spacecraft due to destructive transport load, vibration absorbers are usually installed in the container during spacecraft transportation. How to determine the vibration reduction scheme suitable for different payload weight has become the key point and technical difficulty in the design of vibration reduction in transportation. Aiming at this problem, the size and weight of the target product are analysed, and the vibration features of different sections of the satellite are analysed and tested. On this basis, a general vibration reduction subsystem of the container is designed, which is suitable for three kinds of satellite sections and four types of transportation conditions, and the loading distribution parameters are optimized. Transportation test data show that the vibration reduction effect of the new system for aerospace products meets the design requirements.
Exploration on Extracting Geometric Model by Topology Optimization Design
Authors: Miao Jiaqi 
Published: March 2020

Abstract
Topology optimization design is a way to achieve more efficient design with a minimal priori decision. However, due to the complexity of the solution obtained, topology optimization is usually limited to theoretical researches and can not be applied into actual manufacturing. As a new manufacturing method that is currently developing rapidly, additive manufacturing has made great progress in many fields. Additive manufacturing has fewer limitations on the shape and complexity of the design. And it is currently moving toward higher precision and larger dimensions. The combination of these two ways can solve the problem of topology optimization design well. However, the topology optimization design’s principle determines that it is difficult to transform into a 3D model that can be processed and manufactured pefectly. Based on the topology-optimized structure, this paper uses MATLAB to extract the geometric model and smooth it, which provides an effective method for extracting 3D models from topology optimization. Also, this paper puts forward an efficient method to optimize the structure and it gets a pretty good result in the simulation.
Study on the Reuse of Abandoned Shared Bicycle Materials
Authors: Shui Xingfei , Lu Xinhui , Lin Xinyu 
Published: March 2020

Abstract
The abandoned shared bicycle materials was redesigned and reused to manufacture fitness bikes, in basis of the analysis of its function and structure, to boost its recyclability. This work was referred from the mature re-manufacturing technology. The structure and dimensions including lever length, seat height and crank length of fitness bike were analyzed using ergonomics method.
Effect of Three Heat Treatments on High Temperature Oxidation Properties of GH4169 Alloy Produced by SLM Additive Technique
Authors: Liu Xuenan , Liu Siyuan , Feng Sengnan , Li Huixiang , Wang Yizhe , Gong Jianhong , Sun Hui 
Published: March 2020

Abstract
In this paper, GH4169 nickel-based superalloy molded samples produced by Selective Laser Melting (SLM) were subjected to aging treatment and solution and aging treatment to study the high temperature oxidation behavior under different heat treatments. It is found that the high temperature oxidation products of GH4169 samples produced by SLM is mainly Cr2O3. The alloy sample under heat treatment has a higher high temperature oxidation rate. The oxide film of GH4169 alloy sample treated by solution and aging treatment has a high forming speed, and the surface of the oxide film is continuous and dense, and the quality is the best, and the protection effect on the alloy matrix is the best.
One-Step Synthesis of Au Nanoplates with the Assistance of Formaldehyde
Authors: Xia Jing 
Published: March 2020

Abstract
In this work, a facile method has been developed to fabricate Au nanoplates in one step through heating formaldehyde and HAuCl4 aqueous solution. The obtained Au nanoplates are single crystal with an average edge length of approximately 160 nm. And the formation of plate-like Au nanostructures is because of the adsorption of formaldehyde on the surfaces of Au nanostructures, leading to a similar surface energy of {111} and {100} facets.
Exploration on the Structure Parameters of Nozzle-to-Throat Clearance in Vacuum Generator
Authors: Guo Xilong , Li Yong 
Published: March 2020

Abstract
Nozzle-to-throat clearance is one of the main factors affecting the injection coefficient of the vacuum generator. The increase of nozzle-to-throat clearance will lead to the aggrandizement of the annular duct area which the driving fluid passes, thereby amplifying the ejector flow rate of ejector tube and the injection coefficient. On the contrary, Keenan [1] obtained the result through the experiment that the injection coefficient decreased as nozzle-to-throat clearance increases, because the accretion in nozzle-to-throat clearance would increase the pressure of inlet plane of the mixing chamber, resulting in the decrease of the driving pressure difference of the driving fluid, hence the injection coefficient diminished. In this paper, the numerical simulation method is used to obtain the optimal nozzle-to-throat clearance parameter size.
Preparation of polyacrylic acid and its activation on macrophages
Authors: Zhou Mengmeng , Li Xin , Wang Zhengzheng , Zhou Haijun , Chen Xiaoqi , Yang Shulan , Li Yantao 
Published: March 2020

Abstract
With the rapid and efficient development of animal husbandry industry, intensive a nd large-scale has become the main body, and the corresponding use of vaccines and vaccine adjuvants has gradually increased. Polyacrylic acid has been widely used in vaccine adjuvants because of its safety and low toxicity. In this paper, polyacrylic acid was been prepared by aqueous solution polymerization, taking redox system as catalyst. The molecular structure of polymer was characterized by FT-IR. Viscosity average molecular weight was tested on a ubbelohde viscometer. Moreover, activation of polyacrylic acid on macrophages was analyzed by cell culture method. Results showed that the vaccine prepared by polyacrylic acid as adjuvant and chicken ovalbumin could stimulate macrophages to produce higher IL-1 β.
Research on Preparation Technology for Continuous Carbon Fiber Reinforced Printing Filaments
Authors: Bi Xiangjun , Tan Hongsheng , Li Zonghui , Li Yuqin , Liu Tengfei 
Published: March 2020

Abstract
Continuous carbon fiber reinforced thermoplastic composites with high mechanical strength can make up for the low-bearing faults of pure resin material and particle reinforced material. At the same time, the physical properties of fiber conduction can meet the structure damage detection and conductive functional requirements. It is seen as one of the advanced technology in thermoplastic 3D printing field. At present, the material has been gradually used in robot manufacturing, aerospace components manufacturing and so on. This paper introduces the preparation process of continuous fiber reinforced printing filaments and the characterization of mechanical properties, morphology and printing results. It points out that the printing filaments can meet the basic requirements of continuous fiber reinforced printing, which with high fiber orientation is affected by prepreg tension function. In addition, the small diameter filaments have obvious advantages in transportation, printing fabrications and printing effects. It is suggested that continuous fiber reinforced printing is suitable for choosing filaments with the diameter of 0.4mm or less.
The Static Characteristic Analysis on Key Components of Boring-milling Machining Center
Authors: Tao Lin , Zhao Yuan , Zhao Yue , Zhang Lili 
Published: March 2020

Abstract
Taking TH5650X50 Boring-milling Machining Center as the research object, analyze the static characteristics of the two key components of the milling system. Use finite element software to create 3D model of the two key components of the milling system and design the whole virtual assembly of milling system. Based on the theory of cutting deformation, consider the application of its forces and non-forces in the way of a remote payload and remote quality. The finite element model of spindle box-principle axis and crossbeam are obtained by circular grid division method, and all the parameters of the finite element model are solved by FFEPlus solver in Solidworks Simulation module. The study verifies the accuracy of the finite element mode, and obtains the deformation of the two key components under the most adverse conditions.
An Algorithm for Leakage Detection of the Heating Pipeline
Authors: Guo Huijie , Li Yulong , Yang Fan 
Published: March 2020

Abstract
The existing heating pipeline in our country has the serious problem of bubbling, dropping and leaking, which causes the huge waste of energy and the loss of pipeline investment. An algorithm for leakage detection of the heating pipeline is proposed to solve the difficult problem of heating pipeline leakage monitoring by establishing the background noise database, capturing effective noise signals, screening suspected leakage noise signals and recognizing the leakage noise signal with an advanced coarse-to-fine process. Once the pipeline leakage is detected, professionals will be informed to locate and repair the leakage point to minimize the impact of the accident. Meanwhile, the background noise database and the parameters of leak detection algorithm are updated by using false alarm signals, which can continuously improve the accuracy of heating pipeline leakage detection.
Study on Positive and Negative Materials of High Performance Ion Batteries
Authors: Song Jialong , Sun Zijia , Sun Mingfen 
Published: March 2020

Abstract
Study on positive and negative materials of high performance Ion batteries is presented in this manuscript. In recent years, sodium ion batteries have developed rapidly, and a number of key materials with electrochemical activity have emerged. Among them, the transition metal oxide as a core sodium ion battery positive electrode shows considerable sodium-embedded capacity, but the capacity decays severely during continuous cycling. This paper studies the novel findings on the mentioned issues to provide the new perspectives for assisting the future research.
Experiments Research on Electrical Discharge Grinding Polycrystalline Diamond Tool based on Surface Quality Analysis
Authors: Jia Yunhai , Guo Jianmei , Zhang Qinjian , Sun Yue 
Published: March 2020

Abstract
As the hardest material in the field of synthetic materials, polycrystalline diamond has attracted more and more attention in the field of tools, which reflects the basic characteristics of ‘high efficiency, precision and flexibility’ of modern advanced cutting technology and clean production. Electrical discharge grinding (EDG) is often used in polycrystalline diamond tools, especially in special shape, thin and fine edge cutting tools. Taking two kinds of grain size of polycrystalline diamond as the research object, taking the machining test and material test as the analysis means, this paper simply compares the surface quality of disc electrode and wire electrode machining, and studies the influence of diamond particle size, electrode polarity and electrode rotation speed on the surface quality and material removal rate of precision electrical discharge grinding polycrystalline diamond. The results show that there is no porous structure, good surface quality and no selectivity in discharge removal when using the negative polarity machining. With the increase of electrode rotation speed, the removal amount of polycrystalline diamond material increases gradually, and the surface roughness of polycrystalline diamond material decreases first, then increases. When the electrode rotation speed reaches 80 m/min, the surface roughness of the polycrystalline diamond sample reaches the minimum value, and the removal amount of polycrystalline diamond material also tends to be stable.
Study of a fatigue damage model for flange considering the friction coefficient of the faying face
Authors: Zhao Yuhao , Wei Jing , Yin Wencan , Zhang Shijie 
Published: March 2020

Abstract
In the flange connections, part of the load is transmitted by the friction moment between the faying faces, thus the distribution of the input load in the connection is changing with the friction coefficient. Current models usually calculate the fatigue damage directly according to the load spectrum without considering the variation of the load due to friction coefficient. In the paper, a fatigue damage model for flange plate considering friction coefficient is proposed, and the influence of friction coefficient on the load distribution of the connection is deduced. Based on Palmgren-Miner linear damage theory, the algorithmic expressions of fatigue damage at varying friction coefficient are derived, which not only assesses the fatigue strength of flange under variable friction coefficient, but obtains the friction coefficient range which meets the fatigue strength requirement of flange connections.
Study on the Preparation Technology of Hollow Yarn with Hollow Stability
Authors: Li yifei 
Published: March 2020

AbstractAt present, there are few researches on hollow yarn. This paper mainly focuses on the strength of hollow yarn. The purpose is to prepare a hollow stable hollow yarn. Several different spinning processes were used in the experiment. Control group and experimental group were used in the experiment. Among them, the control group was prepared by spinning ordinary hollow yarn; the experimental group was prepared by soluble vinylon and hot-melt polyester filament. According to the difference of melting point and solubility in water of these materials, two groups of hollow yarns are formed by high temperature heating and water bath heating respectively. After spinning, the stability of hollow yarn was tested by strength test.
Comparative Study on Molecular Dynamics Simulation Methods of Mechanical Properties of Tricalcium Silicate and Dicalcium Silicate
Authors: Bu Yuhuan , Du Wenxiang 
Published: March 2020

Abstract
A comparative study on the mechanical properties of tricalcium silicate (C3S) and dicalcium silicate (C2S) under different force fields and different sizes by molecular dynamics method. The C3S and C2S single crystal and supercell molecular model were established respectively. The molecular dynamics simulation was carried out under the three force fields of COMPASS, COMPASS II and Universal to obtain the mechanical properties of the nanostructure. It is found that the COMPASS II force field is suitable for C3S and C2S mechanical simulation performance under the same size, which is closer to the literature value. Under the same force field, the large-size unit cell mechanical performance simulation is more stable and reliable than the small-size simulation result. Mechanical properties are one of the most important properties of cement stone. The hydration products of C3S and C2S are responsible for the mechanical strength of the cement stone. Therefore, studying the mechanical properties of C3S and C2S is of great significance for the development of cement materials.
Polystyrene-supported nickel complex catalysed deprotection of allylic tertiary amine with sodium borohydride
Authors: Bao Lingxiang , Liang Honggang , Zhang Haonan , Yan Zhiyuan , Sun Chenghui , Pang Siping 
Published: March 2020

Abstract
This work represents a green and facile approach for the polystyrene supported nickel catalysed deprotection of allylic tertiary amine. The careful instrumental investigations with XPS, TEM, TGA, XRD and ICP-AES precisely characterized the developed heterogeneous catalyst. Cheap metal, mild reaction conditions, good yields as well as the reusability of the catalyst made this method more environmentally friendly.
Failure analysis of the low-pressure blade lacing wire in steam turbine
Authors: Qiao Lijie , Feng Keyun 
Published: March 2020

Abstract
The failure analysis of the low-pressure last stage blade lacing wire in steam turbine made of 0Cr17Ni4Cu4Nb(S17400) is presented. The failure of the low-pressure last stage blade occurred at 7 operating years. Several examinations were carried out to identify the blade lacing wire failure’s root cause: macroscopic inspection, chemical composition analysis, hardness test, metallographic analysis, microscopic examination and inspection of maintenance records. It is found that there is local displacement of the roots of the low-pressure rotor, and the collision between the lacing and the lacing holes is the direct cause and external mechanical incentive of the lacing fracture.the high content of P element and the high hardness reduce the plasticity and toughness of the material which is the intrinsic factor of this tensile fracture, without obvious plastic deformation, the low-pressure last stage blade lacing wire breaks rapidly. It is suggested to find out the local displacement of blade root and fix it in a reliable way, check the strength after eliminating the harmful defects such as cracks, and replace the blade if necessary, strictly according to DL/T438-2016 and the manufacturer’s standard requirements for the inspection of the lacing wire before use.
Damage identification of bridge structures based on curvature mod
Authors: Sun Zongjun , Li Kai 
Published: March 2020

Abstract
Based on the modal analysis theory of bridge dynamic characteristics, a pre-damaged reinforced concrete model beam is established by ANSYS as the object of analysis. The regularity of modal parameters such as displac, ement mode and curvature mode of the model beam at the preset damage location and different damage degree and the identification of modal parameters in structure damage are studied by finite element numerical analysis. Sensitivity. The results show that the displacement mode is difficult to identify the damage of the structure effectively, but the curvature mode can reflect the damage of the structure more accurately. The damage identification method based on the curvature mode can be applied to the damage diagnosis of the structure in practical engineering.
Effect of Lignin Removal on Moisture Absorption of Wood
Authors: Zhang He , Chen Yuchen , Wang Yongkuo 
Published: March 2020

Abstract
In the study, we carried out heartwood and sapwood of fast-growing Chinese fir as research objects, the lignin was removed by sodium chlorite method, then the changes of wood chemical composition were detected by Raman spectra, the moisture absorption changes of wood were studied by saturated salt solution method, and the H-H model fitting data was used to analyze the effect of lignin removal. It aims to provide reference for the research and development of new wood modification technologies or wood-based products [4]. The results showed that there was no significant difference between sapwood and heartwood when the relative humidity was lower than 30%. With the increase of relative humidity in the environment, the water absorption capacity of sapwood cells was higher than that of heartwood. The water absorption capacity of heartwood and heartwood after delignification was significantly stronger than that of control wood, especially when the relative humidity was 95%, the equilibrium water content reached about 60%.
Effect of Post-weld Heat Treatment on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Welded Joint
Authors: Zhang Xiang , Xie Dejie , Chen Bo 
Published: March 2020

Abstract
Metal inert-gas welding (MIG) test was carried out using ER5183 welding wire as filler metal and Al-4.8Zn-1.6Mg-0.16Cu alloy profile as base material. Different post-weld heat treatment processes were adopted for Al-4.8Zn-1.6Mg-0.16Cu alloy welded joints. The effects of different post-weld heat treatment processes on the microstructures and mechanical properties of welded joints were studied by means of hardness test, microstructure observation and scanning electron microscopy analysis. The results show that the mechanical properties of welded joints can be improved by artificial aging treatment after welding. At the same time, the comprehensive mechanical properties of re-solution and aging after welding will be significantly improved. The inhomogeneity of welded joints and the distribution of strengthening phases will also be improved, the softening of heat affected zone will almost disappear, and the strength of welded joints will be restored.
Numerical Calculation of Composite Water Lubricated Bearing Considering Effect of Elastic Deformation
Authors: Liu Changjiang , Yao Bin , Gao Genyuan , Wang Yanzhen , Mao Yang 
Published: March 2020

AbstractTraditional bearing design neglects the influence of elastic deformation of materials on bearing lubrication characteristics, based on a new type of polymer composite water-lubricated bearing materials, the influence of elastic deformation of bearing material is introduced into the simulation. The lubrication performance of the water-lubricated bearings is studied with respect to material parameters and structural parameters. The effects of the elastic deformation on the lubrication characteristics such as the maximum pressure value and the minimum film thickness were compared and analyzed under different bearing clearance structures of a certain type of stern bearings. The results show that, the maximum water film pressure of bearing increases with the clearance ratio, and the maximum water film pressure of elastic bearing is less than that of rigid bearing. With the increase of clearance ratio, the elastic deformation of bearing increases linearly. The increase of bearing elastic deformation results in the difference between minimum water film thickness and maximum water pressure between the elastic bearing and rigid bearing.
Optimization of the internal damping rubber elements of the small diameter roller wheel of tracked system
Authors: Korostelev S. A. , Verbilov A. F. 
Published: March 2020

AbstractThe article presents the formulation and solution of the problem of optimization of the internal damping rubber elements of the small diameter roller wheel of tracked system. The search for the optimal design is based on the results of calculating the stress-strain state of the rubber element caused by the assembly of the roller and loads during subsequent operation. As an objective function, the specific energy of deformation of the rubber was chosen. The geometric parameters of the rubber element of the roller wheel in the initial state and after installation in the structure are taken as variable parameters. Explicit and functional constraints in the form of inequations are imposed on the variable parameters. The results of solving the optimal design problem are presented.
Influence of friction forces in limiter-eyelet contact on twisting angles of the rubber elements of tracked system hinges
Authors: Korostelev S A , Gorbachev A V , Verbilov A F , Kovalev V V 
Published: March 2020

Abstract
The article presents a study of the influence of the radial deformation limiters of rubber-metal compounds of tracked systems on the loading of rubber elements. Description of the mathematical model of the dynamic behaviour of a tracked propulsion unit with rubber-metal hinges is presented. Dynamic calculations using the software package based on the equations were performed. The analysis of the results of the computer calculation revealed the influence of friction forces and moments in the contact zone of the limiter-eyelet.