bluuebunny/crossref_metadata_2025_split huggingface dataset:
China Network Public Opinion Guidance Research Hotspots and Development Situation Analysis-Quantitative Analysis Based on CiteSpace Knowledge Map
Authors: Liu Yanfang , Wang Pengyao 
Published: January 2020

Abstract
Through the quantitative analysis of related literatures, it reveals the research hotspots of china network public opinion to guide this research field, and provides theoretical research for the further development of academic research in this field and the improvement of China’s network public opinion guidance work level. Using CiteSpace software to use 2009-2018 as the specified time period, the Chinese literature on the theme of “Network Public Opinion” in China Knowledge Network (CNKI) is used as the source data, based on CiteSpace’s visualization technology, the key Word clustering maps, research organization timing maps, and institutional and author cooperation networks are analyzed. It is concluded that the focus of China’s network public opinion guidance research mainly focuses on the four aspects of the main body, object, carrier and content of the network public opinion.
Effects of Magnesium-Calcium Alloys with Different Calcium Content on Their Mechanical Properties
Authors: Wang Yanan , Liu Guodong , Wei Yukun , Qiao Yang 
Published: January 2020

Abstract
Compared with traditional medical metal materials, magnesium alloys have the characteristics of small density, small elastic modulus and high specific stiffness. In order to study the effect of the addition of calcium on the mechanical properties of magnesium alloys, the tensile test and hardness test of magnesium-calcium alloy were carried out. The stress changes during the tensile test of magnesium alloy were discussed, and the microstructure of its section was further observed, so as to compare the effects of different calcium content on the mechanical properties of magnesium alloy. The results show that the addition of calcium content increases the hardness and tensile strength of the magnesium alloy, and it tends to rise first and then decrease.
Research on Preparation Process of Graphene by Modified Ball Milling and Its Thermal Properties
Authors: Yu Quanmao , Liu Qiurong , Li Xiaoxia , Chen Zhong , Ren Tao , Chen Zhenyu , Huang Zhengyi 
Published: January 2020

Abstract
Graphene is a focus for its excellent properties. The high efficient low cost preparations of high pure Graphene are bottlenecks in Graphene application field. This paper reports a modified mechanical milling high pure Graphene preparation method. The method has the characteristics of less cost and can scale-production. The XRD, TEM and TG/DTA are used to character the properties, especially the thermal properties of Graphene prepared by the method.
Fabrication of Bi2MoO6 Photocatalytic Fibers via Wet Spinning and Enhanced Photocatalytic Activity
Authors: Sun Jun , Zhang Yan , Tian Xiaobing , Yang Meijun , Yang Xiaolong , Yu Jianqiang 
Published: January 2020

Abstract
In this paper, Bi2MoO6 photocatalytic fibers were fabricated by wet spinning method and the photocatalytic activity was found to be enhanced significantly. The Bi2MoO6 powders were prepared by hydrothermal process at different pH (0.4, 6, 8, 10), which is recorded as BMO-0.4, BMO-6, BMO-8, BMO-10. The powders were then mixed with sodium alginate colloid, and fabricated into photocatalytic fibers by wet spinning. The samples were recorded as FB-0.4, FB-6, FB-8, FB-10, respectively. The crystal phase, morphology and photophysical properties of the fiber samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and laser particle size analysis (LPSA). In order to investigate the photocatalytic performance of the synthesized photocatalysts, RhB and formaldehyde were used as simulated water pollutant and air pollutant, respectively. It showed that the efficiency of the degradation of RhB over BMO-10 was 75%, while that enhanced to 85% over FB-10. It should be noted that the content of photocatalyst in the fiber FB-10 was only 1%. The degradation efficiency of formaldehyde in FB-10 sample reaches 92%.
Application of Trace Property in Fire Cause Identification
Authors: Wang Liantie , Meng Qingshan 
Published: January 2020

Abstract
In the investigation of fire causes, there are many kinds of weld marks extracted from the fire site, such as the first and second short circuit weld marks. The relationship between the melting property and the cause of fire can be identified according to the different microstructure characteristics of the weld marks formed on the copper and aluminium wires. Therefore, in the determination of the cause of fire, the nature of the weld mark will directly affect the result of the determination, and sometimes a completely different conclusion will be drawn. However, sometimes in the same fire scene can be extracted from more than one weld mark, and the nature of the weld mark is not the same, which will bring certain difficulties to the fire cause identification work, so the organic combination of all kinds of weld mark, reasonable use, in order to better complete the fire scene cause identification work.
CuInS2 Quantum Dots-based Off/On Probe for Detection of Cetyltrimethylammonium Bromide and L-Cysteine
Authors: Liu Yitong , Guo Zhongkai , Tai Qunxi , Tu Zaiqian , Bai Hanyu , Liu Siyu 
Published: January 2020

Abstract
We developed a convenient method for cetyltrimethylammonium bromide (CTABr) detection based on the quenching phenomenon of CuInS2 quantum dots. There existed a good linear relationship between the fluorescence intensity of CuInS2 quantum dots and CTABr concentration from 0.08μmol/L to 6μmol/L with a detection limit of 25nmol/L. The quenched fluorescence intensity of CuInS2 quantum dots by CTABr could be recovered by L-cysteine, which could be also used to detect L-cysteine from 0.05 to 100μmol/L with a detection limit of 20nmol/L.
Effect of Inhomogeneity of FGM Coating on Contact with Adhesion under the Axisymmetric Indenter
Authors: Yang Fan , Liu Tiejun 
Published: January 2020

Abstract
The contact with adhesion between the FGM coating and axisymmetric indenter is probed into in the present paper. Coating is made of FGM with linear varying modulus. Poisson’s ratios of coating and substrate are chosen to 1/3. The Maugis-type adhesive model is used to describe the adhesive interaction in the adhesion zone. According to the basic equations for axisymmetric problem, the controlling singular integral equations of the contact problem with adhesion are gained by making use of Hankel integral transformation. These integral equations are solved by applying a numerical collocation technique. The results show that the contact damage and deformation on the coating surface can be reduced by adjusting the inhomogeneity of the coating.
Design and Implementation of Fixed Length Profile Cutting System Based on Mitsubishi Q Series and CC-Link Field Bus Control
Authors: Wang Liqing , Cheng Yimin , Hou Xujie , Wang Chang 
Published: January 2020

Abstract
In order to achieve the fixed length cutting of profiles, this paper designs a fixed length cutting system using Mitsubishi Q series PLC as the main controller, Fx series PLC as the slave controller and CC-Link as the field bus. Based on the working principle of the equipment, the paper analyzes the operation process of the cutting system. Based on PLC controller, stepping motor and servo motor, the hardware design of the system is carried out. A mathematical model for calculating the initial remaining length was established and the software was designed. The use indicates that the work intensity of the operator is greatly reduced, the yield is improved, the production cost is reduced, and the application prospect is good.
Micro-mechanism on the Metal Materials with the Fatigue Propagation
Authors: Li Molan 
Published: January 2020

Abstract
Low stress failure due to fatigue is one of the most common and common forms of component failure. Especially for aerospace and Aeronautical products, the system structure is complex, the environmental conditions are complex, the application of new technologies and materials is significant, and the investment of a single product is high. Therefore, the abnormal low stress damage of individual structures often causes catastrophic losses. In practice, most of the components with defects are not easy to find because of the stress damage caused by the continuous crack growth under fatigue load. Therefore, the study of fatigue crack and growth rate has great practical significance. In this paper, the general law and microscopic mechanism of crack growth of metal structural materials under normal temperature and transverse fatigue load are studied.
Research on Preparation of Nano-porous Lithium Iron Phosphate for Lithium-ion Battery Electrode Materials
Authors: Yu Quanmao , Ren Tao , Li Xiaoxia , Chen Zhong , Liu Qiurong , Chen Zhenyu , Huang Zhengyi 
Published: January 2020

Abstract
Citric acid, nitric acid, ferrous phosphate and lithium carbonate as raw materials, the precursor Fe3(PO4)2 were synthesized by precipitation method, and nano-porous lithium iron phosphate (LiFePO4) was prepared by modified sol-gel method. The influence of pH to purity and yield of precursor Fe3(PO4)2 and sintering temperature to purity of LiFePO4 were studied. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy techniques (TEM) were used to character the phase and morphology of nano-porous lithium iron phosphate (LiFePO4).
Effect of Repeated Cutting on Low-frequency Torsional Vibration Tapping Torque
Authors: Li Wenzhao , Li Zhizun , Han Fengqi 
Published: January 2020

Abstract
Low-frequency torsional vibration tapping can significantly reduce the tapping torque, which is an effective method to solve the problem of precision machining of small and deep threaded holes on difficult-to-cut materials. In this paper, the mechanism of repeated cutting of low-frequency torsional vibration tapping is studied by comparing continuous tapping with low-frequency torsional vibration tapping on titanium alloy, and the influence law and mechanism of the process parameters such as repeated cutting times and net cutting angle on the tapping torque are studied through the vibration tapping experiments on different materials. The research results show that under the premise of ensuring the processing efficiency, smaller net cutting angle and larger repeated cutting times should be selected to obtain a good process effect.
Study on Shearing Characteristics of Circumferential Joint Rebate of Stagger-Jointed Shield Tunnel
Authors: Lu Cirong , Zhou Huaizhi , Huang Long 
Published: January 2020

Abstract
At present, the design and construction of shield tunnels often adopt stagger-jointed form with rebate, and improving the mechanical properties of rebate is the key to solving the problem of leakage of tunnel structure and other diseases. This paper aimed at circumferential joint rebate of staggered shield tunnel segment, established the local model of discontinuous contact of three-dimensional solid joint to analyse the influence of rebate and the length and inclined angle of it on shear resistance of joint. The result shows five points: (1) When the segment joint is sheared, the greater the axial force of the joint, the stronger the frictional shear resistance. (2) Setting rebate in joints can reduce the number of dislocations in the stage of rapid development of dislocation and increase the shear resistance of joints. (3) The length of rebate has little influence on the shear strength of joints. (4) The angle of inclined plane of rebate has a great influence on the shear resistance of joint. The smaller the angle of inclined plane, the larger the peak shear force and the corresponding dislocation, while the greater the local stress. (5) When the inclined angle increases, the stress of rebate is more uniform, which can prevent the damage of rebate.
Effect of the Properties of Basalt Fibers Aging in Salt Solution
Authors: Zhang Qichang , Yan Tan , Luo Lida , Wang Qingwei , Liu Jin 
Published: January 2020

Abstract
Basalt fiber is widely used in various fields such as military industry and civil use due to the characteristics of high strength, high temperature resistance and good chemical stability. In this paper, the aging of basalt fiber immersed in different concentrations of NaCl solution at different times was studied. The surface morphology and structure changes of basalt fiber brine after immersion were studied by scanning electron microscopy and Fourier transform infrared spectroscopy. The Fracture strength and weight loss rate of basalt fiber were used to characterize the salt water corrosion resistance of basalt fiber. The results showed that the surface of fiber was slightly corroded and ion exchange occurs in the solution when basalt fiber was soaked in NaCl solutions. The tensile strength of basalt fiber increased first and then decreased with time. It was inferred the ion exchange resulted in surface compressive stress increase the strength of the basalt fiber just like as tempering principle of glass.
High-temperature Creep Behavior of 12Cr1MoVG Steel
Authors: Pan Jinping , Zhu Chaoming , Zhu Xinwei , Tan Lianjiang 
Published: January 2020

Abstract
Heat-resistant steels are key materials for the construction of boilers and high-temperature pipes. Herein, high-temperature creep behavior of 12Cr1MoVG steel has been studied. Creep tests over a long period of time were carried out for 12Cr1MoVG steel samples at varied temperatures. The activation energy for the creep of 12Cr1MoVG steel was evaluated based on the changes of creep rate with temperature when the steel was subject to various stresses. The creep mechanism of the steel has been elucidated by analyzing the relations between the minimum creep rate and the stress. In addition, continuum damage mechanics (CDM) model-based calculation agree well with the strain versus creep time curves obtained from the creep tests. The creep behavior of the 12Cr1MoVG steel at high temperatures has been perfectly described by means of long-time creep tests and mathematical modelling.
Fatigue Performance of T-joint with Complete Weld Details
Authors: Liu Xi , Meng Qingyu , Wang Can , Huang Song 
Published: January 2020

Abstract
The fatigue properties of T-joint of Q345 steel commonly used in construction machinery are studied. The fatigue life of T-joint with complete weld details is analyzed by nominal stress method and the equivalent structural stress method respectively, and compared with the test results. The results show that under the condition of stress ratio R=0.5, the fatigue crack of T-joint with complete weld details often occurs at the weld root of the arc extinguishing and propagate along the weld throat. In production, arc extinguishing should be avoided in key parts. The nominal stress method used to predict the fatigue life of T-joints with complete weld details is dangerous, while the fatigue life of T-joint analyzed by the equivalent structural stress method is basically consistent with the test results.
Preparation and Properties of Poly (Silicon-Containing Arylacetylene)/Attapulgite Foams
Authors: Wu Jiadong , Dong Shilong , Yuan Qiaolong 
Published: January 2020

Abstract
Poly(silicon-containing arylacetylene) (PSA) syntactic foams were prepared by thermally expandable microspheres (EM) in the silicon-containing arylacetylene (SA) resin during curing. The morphology, porosity, thermal and mechanical properties of the foams were studied. Furthermore, the PSA foam was reinforced by attapulgite (ATT) nanoparticles to fabricate the PSA/ATT composite foam. The results display that the density, compressive strength and thermal stability of the PSA foam decrease with increasing EM content in the matrix, but the temperature at 5% weight loss in N2 is still higher than 560°C, and the residual yield at 800°C is larger than 89%. With addition of 10 g ATT in the 100 g matrix, the average specific compressive and flexural strength of PSA/ATT foam are 31.4 MPa g-1cm3 and 33.6 MPa g-1cm3, respectively. The thermal conductivity of the composite foam can decrease to 0.064 W m-1 K-1 and has a density of 319 kg m-3.
Comparisons of Models for Predicting Permeability from Nuclear Magnetic Resonance (NMR) Logging Data in Heavy Oil-bearing Reservoirs
Authors: Zhang Wei , Li Qi 
Published: January 2020

AbstractPermeability prediction always faces great challenge, because it cannot be directly measured from any well logging data. The statistical methods had been widely used. The accuracy was too low to be used. The nuclear magnetic resonance (NMR) logging data was considered to be effective in permeability prediction, and many models had been proposed. However, the NMR logging data was heavily affected by the viscosity in heavy oil-bearing formations. The reliability of the permeability estimation model in heavy oil-bearing reservoirs needed to be checked to make them much valuable in field application. In this study, 24 core samples, which were drilled from the heavy oil-bearing reservoirs of the Zhujiangkou Basin in South China Sea, were applied for NMR and mercury injection capillary pressure (MICP) experimental measurements. The classical permeability prediction models of Timur-Coates model and Schlumberger Doll Research (SDR) model were calibrated. Meanwhile, the permeability prediction model based on the Swanson parameter was also established. These three models were applied in field applications to verify the reliability. Comparisons of the predicted permeabilities by using these three models with the core derived results illustrated that the Swanson based permeability model was widely used. Whereas the permeabilities estimated by using the Timur-Coates and SDR models were underestimated. The Swanson based permeability model was given priority to be recommended.
Development of an Anti-corrosion and Anti-pollution Stone Material
Authors: Lu Yuning , Lin Xiang , Zhao Pei , Zhang Yanhao , Li Enyao , Zhao Su 
Published: January 2020

Abstract
Stone is a non-renewable resource. In order to implement sustainable development in the field of building materials, it is necessary to carry out feasible protection for the existing stone. At present, the performance of the protection materials is relatively single. How to give consideration to both waterproof and anti-corrosion and anti-pollution properties is the focus of this study. Using tetraethyl orthosilicate (TEOS) as silicon source and adding appropriate modifier (silicone oil), the modified silicon stone protective material was prepared by sol-gel method. The ratio ranges of water, ethanol, hydrochloric acid and TEOS were determined by experiments, which were 1:1, 1: 1 ∼ 1: 2, 1: 10 ∼ 1: 20 respectively, the reaction temperature was 60°C, and the reaction time was 3.5h. Under the experimental conditions, adding modifier hydroxyl silicone oil (0.2%) can improve the anti-corrosion and stain resistance of stone protection materials.
Ecological Toxicity of Triclosan (TCS): A Review
Authors: Xu Xiaolu , Zhang Deyong , Zhang Wuchun 
Published: January 2020

Abstract
TCS has been detected in water systems and organisms all over the world. TCS in water body mostly exists at ng/L or g/L level. The highest content of TCS is mostly from sewage plant water samples, some of which reach 26.80 g/L. TCS concentration was 0.4-38.0 ng/g in maternal plasma and 0.022-0.95 ng/g in breast milk. TCS has been proved to be toxic to algae, plants, lower animals, amphibians, fish, mammals and other organisms at all levels, mainly in growth inhibition, lethal effect, endocrine interference, reproductive toxicity, DNA toxicity and so on.
Design of A New High Efficiency Heat Storage System for Small and Medium-sized Photothermal Power Stations
Authors: Wang Yipu , Wang Bingzheng 
Published: January 2020

Abstract
In order to solve the problems of low temperature and high cost of traditional photothermal power generation heat storage system, a new high-temperature solid heat storage system consisting of three subsystems of heat extraction, heat storage and heat utilization is designed. Taking air as heat medium and safe heat-resisting regenerator as heat storage material, the heat preservation characteristics, overall thermal efficiency and flow resistance of the regenerator were analyzed and calculated. The results show that the regenerative system runs steadily, the heat loss of the regenerator is less than 5%, and the overall thermal efficiency of the system is more than 85%, which is better than the general regenerative system.
The Co-Pilot Position of Vehicle Noise Quality Prediction Based on SVM
Authors: Zhang Xiaojuan 
Published: January 2020

Abstract
In three different types of domestic cars for example, the paper studied interior noise sound quality when engine idle at a constant speed in different speed operation. Noise test using HEAD Acoustics multi-channel noise test system, sound quality subjective evaluation experiment was carried out in a semi-anechoic. Vehicle sound quality was studied using support vector machine (SVM) model, the results showed that car interior sound quality mainly by four psycho-acoustical parameters: A-weighted sound pressure level, loudness, roughness and jitter degree. The support vector machine forecasting method can guarantee the accuracy of prediction results for small sample data, which has higher accuracy in predicting, error lower.
Wet Oxidation Treatment of Waste Activated Sludge of a Pharmaceutical Factory
Authors: Guo Pengfei , Zeng Xu , Yao Guodong , Zhou Yangyuan , Zhao Jianfu 
Published: January 2020

Abstract
As the development of pharmaceutical industry, large amounts of sludge was produced, which is a hazardous waste with high environmental risks and high disposal fees. In this study, the wet oxidation treatment of pharmaceutical sludge was investigated. The effects of the reaction parameters on the process performance were discussed, such as reaction time, temperature, initial oxygen supply and catalysts. The results illustrated that the highest removal rate of volatile suspended solids (VSS) and the total chemical oxygen demand (COD) removal rates could reach up to 60.7% and 91.3% separately under 260°C with initial oxygen pressure 1.0 MPa and the reaction time 60 min. Thus, the wet oxidation process provides an economical and feasible alternative for the industrial activated sludge treatment, especially for the pharmaceutical sludge.
Analysis of Removal Function Results of Permanent Magnet Polishing Device Test
Authors: Zhou Xiaoqin , Sun Baoquan , Wang Haocheng , Yu Hang , Wu Xiaoyang 
Published: January 2020

Abstract
Based on the test platform of the polishing device, the material removal function model of the workpiece is obtained by using the Preston empirical equation and the motion state of the polishing tool. The test platform is built and the material removal model is verified by polishing the workpiece. Using Matlab software, draw the mathematical model material removal function curve and the test material removal function curve, analyze and compare the material removal law of the workpiece, and analyze the surface quality before and after the workpiece polishing.