bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of calcination time on degradation of landfill leachate by Fe-Co-Ru-Ce / γ-Al2O3 catalytic wet oxidation system
Authors: Wang Qingyu , Zhang Honghua , Zhang Yongli 
Published: March 2020

Abstract
The landfill leachate was used as the target pollutant, and the degradation was carried out by catalytic wet oxidation. The heterogeneous catalyst Fe-Co-Ru-Ce/γ-Al2O3 was prepared by impregnation method. The calcination time was set to 1.5, 3, 4.5, 6, 7.5 h respectively, the catalyst was calcined at a constant temperature for a set time to prepare five catalysts, and the influence of the calcination time on the activity of the catalyst was investigated. The results showed that when the calcination time was 3 h, the activity of the catalyst reached the maximum. At this time, the COD removal rate and decolorization rate of the treated water were 78.1% and 60.4%, respectively.
Effects of the specimen form on high cycle fatigue properties of 7050-T7451 and 2524-T3 aluminum alloys
Authors: Tong Dihua , He Yuhuai , Hu Benrun , Chen Bo , Zhao Yanguang 
Published: March 2020

Abstract
High cycle fatigue properties of 7050-T7451 and 2524-T3 aluminum alloys at three stress ratios R=-1, 0.06, and 0.5 were experimentally studied, in which the axial stress control method was used to measure the funnel-shaped and iso-section specimens, with a MTS electro-hydraulic test system. Stress-life data were obtained and equivalant stress-life curves were plotted based on the equivalent stress model. Results showed that as for 7050-T7451 and 2524-T3 aluminum alloys, stress-life curves obtained with two kinds of specimens basically agreed, and effects of the specimen form on high cycle fatigue properties of these two aluminum alloys can be neglected.
Micro-X-Ray Diffractometer Focused by Polycapillary Optics and Its Applications for Materials
Authors: Jiang Qili , Shuai Qilin , Liu Jun , Cheng Lin 
Published: March 2020

Abstract
The analysis of small samples and micro areas of large samples are significant in material, environment and geology fields. This work reports the study of a micro-X-ray diffractometer developed by our laboratory and its applications for not only micro-X-ray diffraction (μ-XRD) analysis but also micro energy dispersive X-ray fluorescence (μ-EDXRF) analysis. The accomplishment of the two analysis methods in one instrument makes it possible to characterize micro materials in situ by a very efficient way. In order to demonstrate the feasibility of this diffractometer, the samples difficult to be measured by the conventional diffractometer were studied. Firstly, a cooper wire with a diameter of 140 μm was analysed as a micro sample. Then two different points of a TiN film were analysed to discuss their phase transitions in micro areas. Moreover, the phase distribution of a two-dimensional area on an iPhone mainboard was scanned. The phase mapping was acquired by data processing. These researches highlight the abilities of this diffractometer in the applications on micro material characterizations. As a result, this diffractometer can adapt to the analyses of elemental composition, mineralogical composition and their distributions in the micro materials. It can also provide useful reference information for the micro phase transitions. Therefore, it can be concluded that this micro-X-ray diffractometer has potential prospect in the micro material analysis and any other related fields.
Preparation and properties of solid waste based lightweight plastering gypsum
Authors: Tian Xiaohua , Liu Dongji , Zhao Fengqing 
Published: March 2020

Abstract
The lightweight plastering gypsum with excellent heat preservation performance was prepared from β-hemihydrate gypsum obtained by calcining desulfurization gypsum, the polyurethane foam waste modified with water glass, and a composite auxiliary agent composed of ground steel slag and granulated blast-furnace slag. The density of the product is 762.3 kg/m3, the initial setting time is 150 min, the final setting time is 205 min, the flexural strength is 3.1 MPa, the compressive strength is 6.8 MPa, and the thermal conductivity is 0.098 W/(m⋅K).
Study on Mechanical Behaviors and Electrolyte Uptake of PVDF/PES/TiO2 Composite Fiber Separators
Authors: Cheng Kai , Chen Xin , Liu Shuai , Cao Qingyuan , Yu Weiwei , Cui Weiwei 
Published: March 2020

Abstract
In this paper, polyvinylidene fluoride (PVDF)/polyether sulfone (PES) spinning solution with different TiO2 content was obtained by in-situ generation. The prepared spinning liquid was fabricated into PVDF/PES/TiO2 composite membranes via electrospinning. The scanning electron microscopy (SEM), differential scanning calorimetry (DSC), mechanical properties, electrolyte uptake were conducted to test the performance of the obtained separators. The effect of TiO2 contents on the properties of PVDF/PES separators was discussed. The experimental results show that the doping of nano-TiO2 particles will enhance the performance of the separators. DSC test and electrolyte uptakes showed that the enthalpy of the polymer decreased and the electrolyte uptake increased with TiO2 contents. When the separators contents 2 wt% TiO2, the enthalpy changes reach the maximum (28.259 J/g), and the crystallinity is measured to 26.99%. With the TiO2 addition increases, the tensile strength of the membrane also showed the tendency of increasing first and then decreasing. At 6 wt%TiO2, the tensile strength of the membrane was better, reaching 5.606 N/mm2, and the toughness was the best. It shows that the addition of TiO2 helps to enhance its tensile strength as well as toughness When the TiO2 content is 6 wt%, the overall performance of the membrane is the best.
Design and Performance Test of an HTS Magnet for 1 MW HTS DC Induction Heater
Authors: Hu Lei , Dai Shaotao , Yan Xufeng , Ma Tao , Zhang Teng , Wang Bangzhu 
Published: March 2020

Abstract
Compared with a small magnet, the magnet for IMW HTS DC induction heater is larger, and the radius reaches up to 2200mm, which will bring great difficulties to the winding of superconducting magnets. To ensure that the design and fabrication of the large-diameter HTS DC magnet can be a one-shot success, some smaller HTS magnets, including three 200 mm diameter magnets and two 600 mm diameter magnets, have been designed and fabricated. The structure of these magnets is similar to the final 2200 mm diameter prototype magnet, which is wound in a spiral way. Performance test results of all the superconducting magnets have proved that the winding process and curing process of the magnet is feasible and can be used to make large-diameter magnets formally.
Nuclear Power Plant Operator Auxiliary Robot System
Authors: Fang Xiang , Wang Limin 
Published: March 2020

Abstract
The potential problems on nuclear power plant when being operated by nuclear power plant (NPP) operators are discussed in the paper. The solution related to artificial intelligence (AI) is suggested. When using auxiliary robot system to support NPP operators to operate NPP, the relevant technologies and solutions are analyzed. The application of auxiliary robot system can be developed to other industries operation on operators support.
Study on chemical kinetic mechanisms of Polyoxymethylene Dimethyl Ethers (PODEn)
Authors: Zhao Yuwei , Li Ning , Xie Yijing , Cheng Yuemeng , Wang Xiaochen 
Published: March 2020

Abstract
Based on the latest detailed mechanism of Dimethoxymethane (DMM), a new chemical kinetic mechanism model of Polyoxymethylene Dimethyl Ethers (PODEn) with high degree of polymerization was preliminarily developed by extending reaction classes of DMM to PODE3 with the same rate coefficient criterion. Compared with the existing PODEn model and experimental data, it was observed that the model of He could forecast the experimental data of PODE3 accurately, but the prediction ability of the underlying DMM mechanism was poor. The model developed in this paper could forecast DMM experimental data accurately but could not forecast the experimental data of PODE3 accurately. The same reaction classes of PODEn with different degree of polymerization did not have the same rate coefficient criterion.
Research on anti-explosion performance of a new composite structure
Authors: Xu Hao , Qiu Xiaoqing , Wang Gang , Zhang Xiaofeng 
Published: March 2020

Abstract
A rigid-flex composite composite structure is proposed and its impact resistance under blast load impact is studied. Using the finite element software Abaqus/Explicit, the three-dimensional Hashin failure criterion was established by writing the VUMAT subroutine, and the three-dimensional solid finite element model of the composite laminate was established by using the Cohesive interface unit as the bonding layer. The reliability is verified by comparing the simulation results of the finite element model with the results of the existing literature. Through simulation analysis, it is found that after adding the flexible layer, the energy absorption capacity of the structure is improved, the resistance to deformation is slightly reduced, the design requirements are met, and the expected effect is achieved.
Effect of loading frequency on corrosion fatigue crack growth rate of 7N01 aluminum alloy
Authors: Yu Yangyang , Sun Weiguang , Tong Dihua 
Published: March 2020

Abstract
The fatigue damage of engineering structures is mostly caused by cyclic stress and external environmental factors. Therefore, the study of corrosion fatigue crack propagation is of great significance to the safety and durability of structures. The effects of different loading frequencies (10Hz, 1Hz and 0.1Hz) on fatigue crack growth rate of 7N01 aluminum alloy in humid air were studied by using load control method. The results show that the corrosion fatigue crack growth rate is basically the same at 10Hz and 1Hz, When the loading frequency decreases to 0.1Hz, the corrosion fatigue crack growth rate is slightly higher than 10Hz and 1Hz.
Preparation of Silicon Carbide hollow fiber Membrane in Low Temperature by Precursor Pyrolysis
Authors: Xu Man , Guan Mengke , Wang Shulin , Wu Mengyu 
Published: March 2020

Abstract
The silicon carbide (SiC) powder is covered with polycarbosilane (PCS), N-Methyl pyrrolidone (NMP) is a solvent, polyethersulfone (PES) is a bonding aid, using phase-phase and solid-phase sintering process combined with a step-by-step molding to prepare a symmetrical structure of silicon carbide hollow fibers, and determine the membrane’s perforation and purification and purity of the water distribution and the circumference of the membrane. The results show that the SiC membrane tube is a finger-hole structure layer-spongy structure layer-finger-hole structure structure, the optimal sintering temperature is at 1200 °C, the size of the prepared ceramic membrane aperture is concentrated in about 0.9 μm, and the pure water flux is 2.832m3 / (m2⋅h).
Separation of waste cotton-polyester blended fabric
Authors: Li Zhi 
Published: March 2020

Abstract
The separation of waste textiles could reduce the pollution and pressure of the environment. Through this article, as the procedures of added glycol (EG) and catalyst in reaction system. After depolymerize the polyester fibre(PET) of the waste cotton-polyester blended fabric to alcoholysis as bis-hydroxyethyl terephthalate (BHET), and then separate it with solid cotton and liquid BHET through the solid - liquid separation device.
Fracture Failure Analysis of Flameproof Enclosure of Hydraulic Pump Regulator
Authors: Wang Yufei , Wang Yu 
Published: March 2020

Abstract
A flameproof enclosure of hydraulic pump regulator has undergone a durable vibration fatigue test. Lugs have been found dropped during the test before the expected life. Failure analysis has been carried out by means of macro and micro observation, energy disperse spectrum analysis, metallographic examination and hardness test. The reason of the failure is the fatigue resistance of this flameproof enclosure is not enough to endure the test. According to suggestions, a new structure flameproof enclosure has been improved to instead of the flanging lugs. The improved new one has passed the vibration test successfully.
Study on the interface of Al/Mg bimetal by static casting
Authors: Yu Yingshui , Yu Xincheng , Li Bo , Yao Chenglong 
Published: March 2020

Abstract
In this study, fine aluminum cladding AZ91 magnesium alloy composite ingot was prepared under static casting. The microstructure and phase constituents of the interface were investigated by optical microscopy. The result shows that the interface from the Al matrix side can be divided into three parts. A diffusion layer made up by β-Al3Mg2, Mg-Al mtermetallic compound layer which is made up by γ-Mg17Al12 and a eutectic structure layer made up by α-Mg and γ-Mg17Al12. The element distribution is investigated by methods of electron probe microanalysis (EPMA). The component ratio of Al to Mg decreases in the whole interface. But the descent becomes very slow in the α-Mg and γ-Mg17Al12 eutectic structure layer. The Vickers hardness in the matrix and interface were also measured. The value of microhardness decrease with the phase changing in the whole interface from 120 HV to 275HV, but it’s still much higher than the Al matrix or AZ91 matrix as well.
Mixing Characteristics of Polymer Melt in Triple Screw Extruders with Combined Screws using Finite Element Method
Authors: Xin Yaoyu , Zhu Xiangzhe , Wang Tianshu 
Published: March 2020

Abstract
The triple screw extruder is a new equipment of polymer processing. A three-dimensional modelling of a triple screw extruder with combined screws of convey and mixing elements is adopted to investigated the flow and mixing characteristics by using Polyflow software based on finite element method. The axial velocity and pressure distributions in the special central region of the triple screw extruder are specially analyzed. Some mixing evaluated parameters, such as area stretching rate, the probability of mixing index, segregation scale and residence time distribution in different boundary conditions are calculated based on particle tracing method. Moreover, the effects of screw clearance and inlet flow rate of combined screws on the mixing characteristics of polymer melt are discussed. The results show that the increase of the screw clearance can increase the residence time and improve the mixing efficiency of extruder. With the decrease of inlet flow, the distributive mixing efficiency in the triple screw extruder increase gradually.
In-situ growth of β-SiC nanofibers from polymer precursors
Authors: Xu Man , Peng Yongzhi , Yang Kun 
Published: March 2020

Abstract
Silicon powder and different organic polymers were used to in-situ growth of SiC nano fibers on porous SiC ceramic in the current study. SEM analysis showed the most abundant nano fibers were obtained by milling silicon powder for 12 hours, and the highest aspect ratio of nano fibers was obtained by milling for 24 hours. starch, guar gum and collagen were used separately as binding materials for preparing cellulose-silicon powder precursors. The best growth of nano fibers was obtained with addition of collagen. The growth mechanism of nano fibers was proved to be vapor-liquid-solid (VLS). XRD analysis indicated the main crystalline phase is β-SiC after 1400°C pyrolysis.
Experimental study on resistance stability and durability of road active deicing conductive Ethylene Propylene Diene Monomer rubber composites
Authors: Wei Haibin , Ma Zipeng , Han Shuanye 
Published: March 2020

Abstract
Active deicing is the main way to deal with snow and ice disaster now. In order to realize the purpose of active heating deicing, a kind of Ethylene Propylene Diene Monomer (EPDM) multilayer composite with conductivity is proposed in this paper. The resistance stability of conductive EPDM rubber composite is measured after pressure sensitivity, freezing-thawing cycle and high-temperature tests. The results show that the conductive EPDM rubber composite developed in this paper has good compression stability and good resistance durability after low temperature freezing-thawing cycle and high-temperature test.
The Method of Road Traffic Risk Assessment
Authors: Zhu Chao 
Published: March 2020

Abstract
In this paper, a method of assessing the level of road traffic risk sources is proposed. First, based on the key elements involved in road traffic safety, all risk sources are divided into two groups, namely the infrastructure-related risk source and the equipment-related risk source. Then, the risk source is further divided into four grades according to the damage that they could cause. Lastly, a LEC method is introduced to evaluate the influence of risk sources quantitatively.
Research and implementation of tunnel construction schedule management system based on Unity3D
Authors: Zou Yan , Wang Shilin , Shi Wenhao 
Published: March 2020

Abstract
In view of the slow progress of tunnel engineering construction in China due to the influence of terrain geology and climate, a tunnel construction progress management system based on virtual reality simulation technology is developed. The article uses Revit for high-quality model, Unity3D is a three-dimensional virtual reality engine to develop a construction progress management system for construction progress recording and early warning. The results show that the tunnel construction progress management system developed based on Unity3D can alleviate the lag of construction progress, achieve safe and controllable construction site.
Analysis of construction technology and technical advantages of a kind of environmental homogeneous plastic pile
Authors: Ji Feng , Qiu Chengchun , Yao Da , Weng Jiaxing , Xu Guizhong 
Published: March 2020

Abstract
Environmental Homogeneous Plastic (EHP) Pile is an improved cement-soil mixing pile with controllable and adjustable physical and mechanical properties. It is formed by completely replacing and filling while forming holes, so as to solve the disadvantages of traditional cement-soil mixing piles, such as insufficient mixing, uneven pile body and low pile strength. The construction technology of EHP piles was introduced and field standard penetration tests were carried out on EHP piles with different cement contents. It is found that the number of blows required to penetrate a 30cm depth increases with the increase of cement content at the same pile depth. At the same cement content, the number of blows of the EHP pile is greater than that of the traditional cement-soil mixing pile. The change in the number of blows along the pile depth of the EHP pile is also much smaller. Finally, the technical advantages of EHP piles are summarized: uniform and integrated pile body, quality-assured admixture, controllable pile material, and environmental protection.
Numerical study on the sedimentation at intake of the new water supply project in the LaoYeMiao area of Poyang lake
Authors: Wang Zhichao , Niu Jiao , Huang Zhiwen 
Published: March 2020

Abstract
The water intake of a new water supply project of Lushan City is located on the opposite side of the LaoYeMiao in Poyang Lake. Dredging is required between the shore and the deep trough to allow water to be introduced into the intake during low water season. Based on the intake dredging project, this study established a numerical model of water and sediment transport of the research area. The model is verified in terms of water level, flow velocity, erosion-deposition rate using hydrological and topographical data. The characteristics of water flow and erosion-deposition, before and after the implementation of different dredging schemes, are studied and the influence by dredging project are analyzed from the hydrodynamics perspective. The simulation results show that the water level and flow velocity change before and after the dredging project is less than 0.002m and 0.1m/s. The dredging area before and after the project shows deposition, and the average deposition rate changed by 0.01m/year. research shows that the dredging project only affects the erosion and deposition of the dredging area. The adjustment of the dredging scheme will not have a significant impact on the deposition rate and distribution of the area. The research results can provide a scientific basis for the argumentation and optimization of the water intake dredging scheme.
Study on effective protective area of ceramic composite target
Authors: Su Chuanchen , Chen Bin 
Published: March 2020

Abstract
In order to study the difference of ballistic performance in different area of ceramic composite spaced targets, penetration experiment of two targets is conducted. Based on the experiment results, simulation method is used with the dynamic analysis software ANSYS/LS-DYNA, by which the process and mechanism of armour protection is discussed, as well as the effect of unit shape on ballistic performance of targets. It is revealed that the segmentation degree of ceramic cone accounts for the difference in ballistic performance. Besides, the critical points of effective protection is calculated, and the effective protective area of both targets is measured.
Numerical analysis of XCC pile group effect and bearing capacity of piled raft foundation
Authors: Wu Qi , Xu Lai 
Published: March 2020

Abstract
A series of three-dimensional numerical models were established based on the field test to study the interaction of pile-raft-soil system in X-section cast-in-place concrete (XCC) piled raft foundation. The analysis of influence factors of XCC pile group effect was carried out by introducing the interaction factor of piles, and the bearing capacity of XCC piled raft foundation was discussed through comparison with XCC elevated pile foundation and single XCC pile foundation. The computed results shown that the pile location, pile number, pile and soil modulus ratio and pile spacing had a certain effect on the XCC pile group effect. The raft had a negative effect on the bearing capacity of XCC piled raft foundation compared with the foundation without rafts. The ultimate bearing capacity of XCC piled raft foundation was larger than that of XCC elevated pile foundation because the raft and pile of XCC piled raft foundation could provide stronger constraints on the soil between piles and strengthened it.
Dynamic Response of Piles under Wave Loading Based on Comsol Multiphysics
Authors: Liu Yafeng , Jiang Pengming , Wang Yonglu 
Published: March 2020

Abstract
In order to simulate the action of waves on Submarine Structures, COMSOL Multiphysics Finite Element Analysis Software was used. By solving Helmholtz equation in frequency domain of given frequency and introducing artificially applied background acoustics field, considering incidence and penetration of acoustics pressure at the junction of seabed and water surface, a total acoustics field is established. Porous media was characterized by Biot’s consolidation theory to compute the displacement field and acoustics pressure fluctuation in porous media propagating porous elastic waves, considering the viscous loss of the model,so the deformation of Solid Matrix can be described. Finally, a numerical model of wave-pile-seabed was established by coupling the pressure acoustic physical field with the physical field of porous media. The influence of different wave frequencies and wave incidence angles on the displacement of piles and the influence of different wave incidence angles on the stress of piles were analyzed. Finally, the liquefaction of soil around piles was studied.