bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Harmonic Treatment of Intermediate Frequency Furnace
Authors: Li Hailong , Chen Lepeng , Tan Xiaodong 
Published: April 2020

Abstract
In order to solve the problem of power quality caused by harmonics in the factory, this paper mainly focuses on the research of the current situation of the harmonics in the medium frequency furnaces of the factory forging workshop, analyzes the harmonic content of each medium frequency furnace, and adopts a new W-APF active power filter for harmonic suppression. The experimental results indicate that the harmonic content of the medium frequency furnace meets the requirements of the national harmonic standard of power quality public power grid after W-APF filtering.
Polyether Ether Ketone (PEEK) Properties and Its Application Status
Authors: Ling Xuanzhe , Jing Xishuang , Zhang Chengyang , Chen Siyu 
Published: April 2020

Abstract
The physical, chemical and mechanical properties of polyether ether ketone (PEEK) materials have been comprehensively analyzed. Based on methods for reinforcing modification of PEEK, this review has investigated the application status of PEEK materials, summarized the current production and research and development status quo of PEEK at home and abroad and suggested that the application of PEEK should be promoted.
The Investigation about Gel Properties of New Composite Materials with Meta-kaolin
Authors: Ren Jiaqian , Li Meng 
Published: April 2020

Abstract
As one of the most promising building materials, the composite materials of metakaolin have a wide range of applications and excellent performance. Owing to the lack of research on the early-high-strength characteristics of MK, this article tries to make some meaningful attempts. In terms of the characteristics of hydration calcium silicate with gelation performance, this paper studied the preparation of metakaolin, the type of hydrothermal synthesis products, and the corresponding hydration dehydration phase and its rehydration characteristics. Through the exploration and research of the metakaolin hydrothermal synthetic process, it has prepared a new type of early-high-strength concrete regulator and opened up a new way for the effective application of kaolin. The preparation process, structure, and properties of MK-based concrete performance regulators were systematically investigated by XRD and SEM analysis. The macroscopic properties of the MK-based concrete performance regulator were discussed through coagulation time, hydration heat, and compressive strength performance.
Basic Research on carbon fiber in Discharge State
Authors: Peng Yang 
Published: April 2020

Abstract
In order to solve the oxidation problem of the inner electrode in the pipeline reactor during decontamination, this paper proposes that carbon fiber was used as the pipeline structure of the inner electrode for plasma decontamination. The research results show that the reactor with carbon fiber as internal electrode can work for a long time and the decontamination effect will be enhanced. The decontamination efficiency of the experimental device by using ethyl acetate can reach 91%, and the experimental device was characterized by discharge state of discharge voltage and frequency in argon atmosphere, thus describing the process of discharge energy enhancement.
Study on Catalytic Synthesis of Low Molecular Weight Polyether Polyol by Composite Alkaline Earth Metal
Authors: Li Shuo , Gu Zhenggui , Wang Kaijun , Cao Xiaoyan , Liu Yacheng , Wang Can 
Published: April 2020

Abstract
Polyether Polyol is one of the main intermediates in the synthesis of polyurethane. This research work investigated the optimization of polyether polyol from propylene oxide using Single Factor Experiments and Response Surface Methodology (RSM) through composite alkaline earth metal catalyst (BaO/MgO/γ-Al2O3). The BaO/MgO/γ-Al2O3 catalyst was prepared with alkaline earth metal oxide immobilized on γ-Al2O3 by co-precipitation method. The preparation conditions of the catalysts is calcination temperature=600 °C, n(Ba):n(Al)=0.1:1, n(Mg):n(Al)=0.3:1. Represented with XRD, SEM, BET, CO2-TPD, etc. Characterization results showed that the catalysts indicated strong basic site, perfect particle surface area, pore volume, pore size and relatively uniform particle size distribution. Batch analyses demonstrated that the polyether molecular weight and the epoxide conversion was highly influenced by different process factors which include reaction temperature, pressure, time and the amount of catalyst. The conversion of propylene oxide and molecular weight to target product reached almost 63.5% and 600, respectively under the conditions of reaction temperature 190 °C, pressure 2 MPa, time 6 h and catalyst dosage 6%.
Preparation of Cu2O Particles and their Photocatalytic Properties
Authors: Liu Zongbin , Yu Xiaojiao , Yang Fan , Nie Junkun , Zhao Ningning , Li Junpeng , Yao Binghua 
Published: April 2020

Abstract
Photocatalytic technology is a potential way for the environmental problems caused by antibiotics contained in water. In this paper, Cu2O particles were prepared by hydrothermal method. The microstructure and morphology of Cu2O were characterized by XRD, SEM. The optical and electrochemical properties of the prepared samples were studied by UV-Vis and photocurrent. The results show that the prepared Cu2O have an octahedral morphology and exposes more (111) crystal planes, with a particle size of 2-5 μm, and has the better optical absorption performance at 500-600 nm. Finally, the photocatalytic performance of the samples was evaluated using Norfloxacin as the target degradation pollutant. The results show that the degradation rate of Norfloxacin over the prepared Cu2O was 79.8%.The •OH and •O2
− play a major role in degradation of Norfloxacin.
Adsorption Characteristics of Lead by Biochar from Mouth Rinse Residue
Authors: Xie Fang , Zhang Haoke , Liu Jiajia , Tian Shuge 
Published: April 2020

Abstract
Biochars were prepared from mouth rinse residue between 200°C and 600°C.The effects of different pH, adsorbent dosage, adsorption time, and initial concentration of solution on Pb2+ adsorption were investigated. The results showed that the Pb2+adsorption amount of the biochar increased with the increasing pH. At 200°Cand 300°C, the optimum pH was 6.0, and the optimum pH was 7.0 between 400°C and 600°C. The optimal adsorbent dosage was 0.02 g. Pb2+ adsorption amount indicated that biochar prepared at lower temperature was better. The Pb2+ adsorption process of biochars could be well fitted by the quasi-second-order kinetic equation. Fitting five kinds of biochar with Langmuir and Freundlich model showed that the biochars fitted the Langmuir model whose maximum adsorption capacities were 188.68, 185.19, 135.14, 109.89 and 86.21 mg/g respectively. Accordingly, biochar can be a effective way to expand the resource utilization of residue.
Breeding of High-yield Alkaline Protease Producing Strain by Atmospheric and Room Temperature Plasma Mutagenesis
Authors: Liu Yongkang , Li Shichang 
Published: April 2020

Abstract
To obtain alkaline protease producing strain with high-yield, the strain Bacillus subtilis was treated by atmospheric and room temperature plasma (ARTP) mutagenesis. The results showed that the strain had a higher positive mutation rate when the mutagenesis time was 50s. Finally, a high-yield mutant strain A59 was obtained after repeated mutagenesis by ARTP and enzyme activity increased by 23.38% from 6835U/mL to 8433U/mL. Then fermentation conditions of mutant strain were optimized by single-factor method and response surface method, and the optimum fermentation conditions were as follows: 3.6% soybean meal, 5.2% corn meal, 0.9115% Na2HPO4, 0.1593% Mg2+, 0.09% Tween-80 and 5% inoculation volume. Under the conditions of the verification experiment, the enzyme activity of the A59 strain reached 14026 U/mL, which was 2.05 times that of the original strain.
Weather Resistance Performance of Backsheets with Various Structures
Authors: Zhuang Hao , Gou Linlin , Bai Xueliang , Zhou Su , Huang Guoping , Li Jingnan 
Published: April 2020

Abstract
Backsheet is the key element to ensure the power generation of PV modules during their whole life cycle. To continually decrease the LCOE, backsheets of new structures are gradually applied. Currently, the evaluation of module product performance is mainly on the module scale, while the assessment of each single material is rare. This paper is aimed at the evaluation of each single backsheet’s reliability when applied in different climatic environments for the widely used new backsheet structures (BS1-BS5). Through comparative research, the backsheet based on thicker PET was found to have a better mechanical performance and BS3 exhibited good resistance performance in hot and humid condition, which could be attributed to the low water vapor transmission rate of the PO film.
Study on Vertical Bearing Characteristics of Bridge Pile Foundation in Karst Area Considering the Size
Authors: Feng Zhongju , Chen Jinhua , He Jingbin , Huang Zhouyi , Dong Yunxiu , Jiang Dingran , Meng Yingying 
Published: April 2020

Abstract
By using finite element software, the influence of different karst cave span on the bearing characteristics of bridge foundation is analyzed. It is found that when other conditions are certain, with the increase of karst cave span, the ultimate bearing capacity presents a decreasing trend, and the lateral friction of pile drops steeply within the range of karst cave and decreases to a greater extent, showing a certain degree of depth effect, and the end resistance proportion also increases. The results show that when the span of the karst cave is more than 9m, the lateral friction resistance within the range of the karst cave of the pile body drops sharply. The research results can further deepen and perfect the design of pile foundation in karst development area and guide the construction, which has certain theoretical significance and engineering application value.
Study on the Influence of Karst Size on the Vertical Bearing Capacity of Pile Foundation
Authors: Feng Zhongju , Guo Suizhu , He Jingbin , Huang Zhouyi , Dong Yunxiu , Jiang Dingran , Xia Chenming 
Published: April 2020

Abstract
Based on the actual project, this paper studies the vertical bearing characteristics of bridge pile foundation in karst area by Marc numerical simulation. The results show that the vertical ultimate bearing capacity of pile foundation has a negative correlation with the size of karst cave. With the increase of span, the bearing capacity of pile foundation and its sub- bearing capacity decrease. When the span of karst cave is 2m × 2m, the ratio of pile side resistance to pile end resistance is 3:1. When the cavern span is increased to 12m × 12m, the ratio of pile side resistance to pile end resistance is 9 : 1. Therefore, it is necessary to fully consider the influence of the size of the karst cave on the bearing characteristics of the pile foundation during the construction, and make corresponding engineering disposal measures according to the influence degree of different influencing factors, so as to improve the design and construction effect of the pile foundation.
CONSTRUCTION Process Analysis of Giant and Complex Steel Structures
Authors: Chen Junjie , Luan Wei , Gong Ke , Ma Jun 
Published: April 2020

Abstract
The main structure of Xi ’an Silk Road International Conference Centre is a giant steel braced frame structure. The façade of the structure is made up of huge suspended skirtlike suspended structure supported by cantilever roof trusses and steel suspensions, which adds up its complexity. In order to accurately control the installation precision and facilitate the installation of curtain wall glass in the later stage, the pre-chamber construction method is adopted in the roof truss installation to compensate the construction deformation of suspended structure. The static analysis is conducted by SAP2000 to propose a reasonable pre-camber value of the roof cantilever truss. The nonlinear simulation of the construction process is carried out. Through comparative analysis, the optimal sequence of the steel structure construction is obtained, which provides the theoretical basis for the construction of giant and complex steel structures.
Finite element analysis on connection performance of prefabricated steel joints with grouting bolt sleeve
Authors: Kaixuan GUO , Lin GAO , Linlin LIU , Gefei LI 
Published: April 2020

Abstract
Under the national strategy of developing vigorously the prefabricated structure, to study the prefabrication and assembly of steel reinforced concrete shear walls, but the connection performance of the precast steel frame is the key to determine whether the prefabricated structure can be carried out. To the steel joint with grouting bolt sleeve, based on the ABAQUS finite element analysis software, the anchorage length, the thickness of sleeve wall and the bolt diameter are used as the analysis parameters, and it is to be analyzed for the influence trend of the model parameters on the joint performance. The results show that the anchorage length, the thickness of sleeve wall and the bolt diameter all have a positive influence on the tensile bearing capacity, in the meantime, the rational combination can optimize the failure state and improve the tensile bearing capacity of the joints.
Finite Element Calculation and Analysis of Stress and Deformation Characteristics of Arch Dam
Authors: Wei Ping , Wei Liuchuang 
Published: April 2020

Abstract
The arch dam is a high-order and ultra-static overall space shell structure on the consolidation and bedrock, and its geometry, boundary conditions and stress state are complex. The three-dimensional finite element solid model of arch dam is established, and the stress and deformation characteristics of the actual dam project are calculated. It is concluded that there is a large tensile stress at the dam at the arch crown section and a large compressive stress at the dam site. The transverse displacement of the body occurs at the abutment of the upstream and downstream faces. The calculation results are in accordance with the stress and deformation characteristics of the arch dam, and the maximum stress and maximum displacement meet the design requirements of the arch dam.
Numerical Analysis of Deformation of Deep Foundation Excavation in Soft Clay Considering Influences of Time-effect
Authors: Lu Yuan , Bian Youyan , Liu Fusheng , Huang Juehao , Chen Jian 
Published: April 2020

Abstract
The traditional foundation pit design generally only considers the transient deformation. However, the excavation deformation characteristics of deep foundation pits in soft soil layers not only consider the small strain characteristics during the excavation, but also consider the time effect. Taking a foundation pit in Wenzhou as the engineering background, based on the HSS model and the SSC model, PLAXIS finite element software was used to simulate the excavation process of the deep foundation pit. The deformation characteristics of retaining structures and deep excavation are compared and analyzed. Calculations prove that: The deformation rules of the foundation pit with the time effect is basically the same as those without the time effect. During the excavation of the foundation pit, the horizontal displacement of the diaphragm wall, the ground settlement and the foundation upheaval calculated based on the SSC model are larger than those calculated based on the HSS model. The calculation results based on the SSC model show that after the completion of the excavation, the deformations of the foundation pit continue to increase with time, showing a rheological effect. The conclusion can provide theoretical guidance for the construction of foundation pit excavation in Wenzhou area to ensure the safe implementation of the construction process.
Saint Venant solutions for elastic cylinders
Authors: Zhang WX , Yang LM 
Published: April 2020

Abstract
Under the Hamilton system, the dual form governing equations of the cylindrical problem are established using displacements and stresses as the basic variables, and the problem is accordingly transformed into finding the eigenvalues and eigensolutions by adopting the method of separation of variables. Furthermore, solutions for zero eigenvalues and non-zero eigenvalues are systematic studied. The study shows that zero eigensolutions are composed of all the overall deformation solutions such as the traditional tension and bending problems, while non-zero eigensolutions include the torsion and bending groups charactered by local deformations.
An analytical method for the creep and stress relaxation of viscoelastic materials
Authors: Zhang WX 
Published: April 2020

Abstract
Based on the properties of symplectic system and the symplectic orthogonal normalization relation between the eigensolutions, the calculation method of viscoelastic boundary condition problem is given, and the computation of stretching and bending problems is carried out. The results show that the creep property of viscoelastic materials.
Inference of Short-Term Maximum Crack Width of RC Flexural Members Based on Interval Estimation Method
Authors: Yao Jitao , Yan Hanbing , Yan Mingdong 
Published: April 2020

Abstract
The design method based on observation and experimental model only considers the design of ultimate limit state in related research, the application range is not wide. This paper takes the short-term maximum crack width of RC flexural members as an example, puts forward the application of this method in the design of serviceability limit state. Dimensionless method was used to collect 4665 pieces of RC flexural member crack width data, and the normality test was performed to obtain the type of probability distribution obeyed by the crack width. Considering the situation without parameter information and known coefficient of variation, a direct estimation formula for short-term maximum crack width of RC flexural members based on interval estimation method is proposed.
Energy saving application of phase change materials in buildings: A comprehensive review
Authors: Yichao Zhang , Ying Wang , Jinghai Zhou , Zhongren Zhang , Tong Li 
Published: April 2020

Abstract
The theoretical basis of the preparation of phase change energy storage materials is analyzed firstly, and then the preparation methods of fatty acid phase change energy storage materials are analyzed in detail. Furthermore, the application of phase change energy storage materials in building energy saving is analyzed. Finally, combined with the above contents, the application prospect and research direction of phase change energy storage materials are briefly described.
Numerical Simulation on Dynamic Response of Prestressed Concrete Slab Subjected to Blast Loading
Authors: Bai Chongxi 
Published: April 2020

Abstract
In order to obtain the dynamic response of prestressed concrete slab subjected to blast loading, the numerical modeling method for the dynamic response analysis of this kind of member subjected to blast loading was introduced, and the numerical model was established based on the ANSYS/LS-DYNA program. By comparing the numerical simulation results of the dynamic response of reinforced concrete slab with the experimental data subjected to blast loading, the accuracy of the numerical model was verified. So the numerical simulation method can be used in dynamic response analysis of prestressed concrete flexural members subjected to blast loading, with a certain precision.
Improving Duct Parameters to Design Auxiliary Ventilation in Mining Roadways Driven
Authors: Dang Phuong Thao , Bui Van Duyen 
Published: April 2020

Abstract
The level of air leakage of air movement through the duct to the face in underground mine is an important factor in ensuring the efficiency of ventilation during mining roadways being driven in mine. Ventilation ducting system leakage can, in many cases, supply an insufficient quantity of air to the workplace.
Based on the experimental data of the duct leakage measurement when mining roadways driven in Ha Lam Coal mine, a relationship of leakage coefficient, aerodynamic parameter and geometric parameter of the duct has been derived; also maximum vent length with certain auxiliary ventilation equipments has been determined.
Exploration and practice of teaching reform of industrial robot course based on application ability training
Authors: Wang Li , Zhang Enguang 
Published: April 2020

Abstract
Intelligent manufacturing is the main direction of the development of modern manufacturing, and robot technology is applied more and more widely, which puts forward higher requirements for the cultivation of robotics talents in Colleges and universities. As a pilot college transforming to an application-oriented college, we have carried out reform and exploration on the teaching content, teaching method and teaching mode of the course of industrial robot. We have adopted flexible and diverse teaching methods and step-by-step practical courses, which have effectively stimulated students’ interest in learning, cultivated students’ innovative practical ability and achieved good practical results.
Finite element analysis of passenger car transverse stabilizer bar based on NX8.0
Authors: Zhang Enguang , Hui Shuai 
Published: April 2020

Abstract
The parametric design and finite element analysis of the lateral stabilizer bar of the new energy bus were carried out by using NX8.0, and the structural strength and stiffness of the stabilizer bar were qualitatively analyzed. The simplified methods for different boundary conditions, solving types and finite element models are compared. All the processes are completed under the same software, which ensures the uniformity and editability of the data. Finally, the subject is introduced into the student s computer-aided engineering analysis training program, so that the students” comprehensive ability is improved.
Mechanical response analysis and optimization of snap on Prefabricated Concrete Pavement Slab
Authors: Chunhua Hu , Xuan Wang 
Published: April 2020

Abstract
In this paper, a kind of assembled cement concrete pavement slab was numerical analysis to investigate the influence of the size of the tongue and groove joint on load transfer capacity between slabs and the maximum stress in the slab. And the load transfer capacity of the slab and the maximum stress in the panel of different sizes are optimized.
Research on development law of horizontal freezing temperature field of complex curtain
Authors: Yu Changyi 
Published: April 2020

Abstract
Artificial freezing method has been widely used in various underground projects, but the development law of freezing temperature field of complex curtain is difficult to be calculated by analytical method. As a general method, numerical method is feasible to simulate the development law of horizontal freezing temperature field of complex curtain. In this paper, the development law of temperature field in the freezing process is analyzed based on the freezing method construction of a subway connecting passage. The feasibility of this method is verified by comparing with the measured data. The results can be used to guide the design and construction of artificial freezing.