bluuebunny/crossref_metadata_2025_split huggingface dataset:
Abrasion Resistance of Manufactured Sand (MS) Concrete and Its Influence Factors
Authors: Luo Guang , Xie Jicheng , Chen Zheng , Zhang Yun 
Published: August 2019

Abstract
The feasibility of using MS to replace river sand (RS) in concrete pavement has been widely concerned by scholars, however the abrasion resistance of MS concrete pavement serves as a major factor restricting application. Published literature shows huge potential of MS as a replacement of natural fine aggregate. A detailed overview of published literature on property of MS and influencing factors on abrasion resistance of MS concrete is being presented. Regarding the characteristics of MS, the granular shape is characterized by irregular shape, multi-angle and large aspect ratio, the gradation shows a phenomenon of less in the middle and more on both ends, and MS contains high content of stone powder and little mud powder. The influencing factors include mix ratio, lithology, stone powder, admixture, polymer, etc. Among them, stone powder has attracted the attention of many scholars. Nevertheless, few related studies exist at present, source selection and in-depth research merit consideration.
Plasmon Excitations in Spin-Polarized Iron Atomic Chains: A Time-Dependent Density Functional Theory Study
Authors: Lin Jiazhou , Ke Sanhuang 
Published: August 2019

Abstract
By using the time-dependent density functional theory calculations, we study the plasmon excitations in Fe atomic chains with different numbers of atom and different Fe-Fe separations, which are now possible to fabricate experimentally. Because of the Fe valence 3d orbitals and the spin polarization, the excitations along the chain (longitudinal (L) mode) and perpendicular to the chain (transverse (T) modes) are found to be largely different from those in noble metal and alkali metal atomic chains. First, the strength of dipole response becomes weaker due to the more localized Fe 3d states; Second, the L mode is mixed with some multipole contribution; Third, the end mode of the T modes is absent.
Preparation and Characterization of α-Fe2O3 from Iron Mud by Hydrothermal Synthesis
Authors: Luo Shaojun , Li Suqin , Zhang Peng 
Published: August 2019

Abstract
As a solid waste, the synthesis of α-Fe2O3 from iron sludge remains a challenge. In this experiment, α-Fe2O3 nanocrystals were successfully synthesized by hydrothermal method using iron sludge as iron source, and the effects of reaction time and pH on the experimental results were studied. The synthesized products were characterized by X-ray diffraction, SEM, FT-IR and VSM analysis. The results show that the optimum synthesis time and pH are 6 h and 6 respectively. Under these conditions, the size of nanocrystalline α-Fe2O3 is about 80 nm. According to the hysteresis loop, the powder synthesized is a weak magnetic material, which has broad application prospects in high frequency electromagnetic materials.
Analysis of Numerical Simulation on Combustion of Different Fuels in Float Glass Furnace
Authors: Jin Mingfang , He Feng , Xie Junlin , Mei Shuxia , Zhong Liyang , Zhao Yuhua 
Published: August 2019

Abstract
The feasibility and reliability of numerical simulation model and calculation method are verified by comparing the simulation results with the relevant data collected during the operation of the furnace in the actual plant. Under the condition of constant thermal power of the furnace, the combustion status, temperature distribution and nitrogen oxides formation in combustion space of the furnace are simulated and studied when the fuel is heavy oil and petroleum coke respectively. The study found that large-scale transverse circumfluence is formed in the refining zone in the back of the furnace and the temperature system is stable and consistent whether the fuel is heavy oil or petroleum coke. When the fuel is petroleum coke, the combustion in the furnace is more intense and the temperature of the batch is higher, but the crown is eroded more strongly by high temperature flow. When the fuel is heavy oil, the scope of the high temperature zone whose temperature is higher than 2073K is wider, and the temperature of the glass level and the crown in the furnace is slightly higher, but the production of nitrogen oxides with burning heavy oil is much more than that of burning petroleum coke.
Modeling the Electrical Conductivity of Anode for Solid Oxide Fuel Cell using Support Vector Regression Machine
Authors: Tang Jiangling , Huang Ping 
Published: August 2019

AbstractThe electrical conductivity of Solid Oxide Fuel Cell (SOFC) anode is one of the most important indexes effect the efficiency of SOFC. In order to improve performance of fuel cell systems, it is necessary to have model which modeling the electrical conductivity. In this paper, a model using Support Vector Regression Machine (SVRM) was established to modeling the electrical conductivity of La0.75Sr0.25Cr0.5Mn0.5O3-δ-xCuO (LSCM-xCu) composite anode under two influence factors, including operating temperature (T) and Cu content (x) in LSCM-xCu composites anode. The test result by SVRM support that the generalization ability of SVRM model is with high accuracy. The mean absolute error (MAE) of 4 test samples is 0.32, mean absolute percentage error (MAPE) is 1.05%, multiple correlation coefficients (R2) is 1.00, which is quite satisfied with the engineering demand. This investigation suggests that SVRM is a powerful tool to be used for optimal designing or controlling the technological process of fuel cell system.
Comprehensive Treatment Technology of “Two Low and One Close” Well
Authors: Li Kai 
Published: August 2019

Abstract
In this paper, the criterion of “two low and one shut - in” well is formulated, and its formation reason and treatment potential are analyzed and classified. Combined with reservoir multidisciplinary research results and dynamic monitoring data, conventional technology integration treatment and new technology research are carried out for different types of “two low and one shut - in” wells, and a new comprehensive treatment technology is summarized and applied to the “two low and one shut - in” well treatment in Sabei Development Zone, and good results have been achieved.
International Comparison of Professional Degree Education Certification in Environmental Engineering
Authors: Zhang Yuhua , Huang Yidong 
Published: August 2019

Abstract
This paper takes environmental engineering education professional certification as the research object. (1) Through extensive literature research, the environmental engineering education professional certifications such as ABET, ECUK and ASIIN are taken as examples to the certification institutions involved in engineering education certification in developed countries. The content of the certification standard, the certification procedure, the relationship between the certification and the qualification of the engineer were systematically sorted and analyzed in detail. Through comparative analysis, the similarities and differences between the three certification bodies are obtained. (2) The comparative analysis method was used to classify the characteristics of engineering education certification in developed countries as “six combinations”.
Study on Population Development and Carrying Capacity of Water Resources and Land Resources in China——Taking the Next 10 Years as an Example
Authors: Peng Shuolong , Wang Jie , Ye Guangyu 
Published: August 2019

Abstract
The article takes the next 10 years as the research period to explore the challenges that water resources and land resources will face in the context of the universal two-child policy in China. By adjusting the population parameters in the policy context and using CPPS population forecasting software to predict the population size in the next 10 years, we find that the total population of China will continue growing in the next 5 years. In the next 10 years, the urban population will decrease very slightly after the increase for 7 years, reaching a peak in 2027, and the increase will cause deepening urbanization. It is necessary to take countermeasures to cope with the problem of the carrying capacity of water resources and land resources brought about by the growth of the total population and the deepening of urbanization under the influence of the universal two-child policy effect, so as to achieve the harmonious development of population growth and urbanization with ecological environment.
Preparation of Sodium Pyrophosphate Modified Municipal Sludge Biochar for the Cu Adsorption in Aqueous Solution
Authors: Fan Liangqian , Liu Qin , Wang Xianda , Cai Jie , Miao Jiaxin , Wan Yan 
Published: August 2019

Abstract
In this work, sodium pyrophosphate (SP) was used as a modifier to prepare the sodium pyrophosphate modified municipal sludge biochar (SP-MSB) for effectively adsorbing Cu in aqueous solution. Four modification factors, i.e., SP concentration factor, impregnation time factor, impregnation solid-liquid ratio factor, and impregnation temperature factor, were investigated to explore the suitable modification condition for the preparation of SP-MSB. In addition, the Cu adsorption efficiencies of the SP-MSB under the suitable modification condition and the unmodified municipal sludge biochar (MSB) were preliminarily evaluated. The results showed that the suitable modification condition for the preparation of SP-MSB was SP concentration of 60 g/L, impregnation time of 10 h, impregnation solid-liquid ratio of 1:30, and impregnation temperature of 25 °C. The Cu adsorption capability of the SP-MSB was 6.37 times than that of MSB, indicating that the SP-MSB can be used as an alternative adsorbent to adsorb Cu in aqueous solution.
Research on Deformation Characteristics of New Breakwater Structure
Authors: Li Bin , Tong Xinyao 
Published: August 2019

Abstract
With the increasingly stringent of environmental protection requirements of the China, there is fewer and fewer land reclamation projects, so the related research on dredged soil treatment technology has become a hot spot. A new type of mud-sand interbedded structure is put forward in this paper. The dredged soil is filled in membrane bag and interbedded with sandy membrane bag, which gradually forms a stable new seawall core structure. From the finite element simulation results, it is known that the maximum displacement of mud-sand interbedded structure is 2.73 m. After the calculation, the top surface of the mud-sand interbedded structure is 1.9 m from the back surface, and the compression of the mud-sand interbedded structure is mainly occurs in the middle of the body, the bottom and top are less compressed. The design and construction of the breakwater meets the engineering requirements, and it is a feasible and fast breakwater technology on soft soil foundation.
Isolation of Protoplast from Leaves of Castor (Ricinus communis L.)
Authors: Tang Jianian , Liu Bingzhen , Chen Miao , Xue Yingbin , Liu Ying , Wu Zhengwei 
Published: August 2019

Abstract
In the present study, the young leaves of castor were used as materials to obtain protoplast, and the effects of enzymatic hydrolysis system on the yield and quality of protoplast were analyzed detailedly. The results shown that the treatment of the young leaves of castor with 1.5% Cellulase RS and 0.75% Macerozyme R-10 for 80 min could gain the maximum amount of protoplast. In addition, the activity of protoplast was observed with 1% Evans blue staining, and most of the protoplast (76.03%) from castor leaves had physical vitality. It lays a foundation for further studies on plant breeding and functional genes in castor.
Effect of Viscous Flow Activation Energy on the Gas-Assisted Extrusion Forming of Plastic Micro-Tube
Authors: Ren Zhong , Huang Xingyuan 
Published: August 2019

Abstract
In this paper, the effect of viscous flow activation energy on the gas-assisted extrusion (GAE) forming of the plastic micro-tube was investigated by numerical method. The three-phase fluids geometric model was built and same boundary conditions were imposed in the model. Under different viscous flow activation energies (VFAE), the influence of VFAE on the size changes of plastic micro-tube in the GAE were obtained. Moreover, the flow velocities, pressure, temperature, and viscosity distributions of melt were also gotten and analyzed. Results show that with the increase of viscous flow activation energy, the inner and outer radiuses all synchronously increase due to the increase of radial velocity and axial velocity. In addition, the temperature distribution slightly increases, which results in the decrease of the pressure and viscosity of melt.
In Situ Observation of Austenite Grain Growth and Phase Transformation of A517GrQ Rack Steel for Jack-Up Offshore Platform
Authors: Wang Qinghai , Ye Qibin , Wang Wenbo , Deng Xiangtao , Wang Zhaodong 
Published: August 2019

Abstract
Austenite grain size plays an important role for quenched and tempered A517 GrQ rack steel. In order to investigate the austenite grain growth behavior, in-situ austenizing experiments were conducted at different temperatures with varied holding time. Austenite grain growth, and subsequent bainite and martensite transformation were observed by a confocal laser scanning microscope (CLSM). The average austenite grain size increased rapidly from 32.7 μm to 137.9 μm with increasing temperature from 1100 °C to 1250 °C, and abnormal grain growth occurred at 1250 °C for 15 min. While holding from 5 min to 20 min at 1200 °C, the grain size grew gradually from 70.2 μm to 84.8 μm. The grain size distributions under different conditions all obey lognormal function. After austenizing, the rate of subsequent cooling has an significant impact on transformation process. The transformation duration time decreased from over 142 s to 11 s with increasing cooling rate at 1 °C/s and 5 °C/s, which could be corresponding to bainite and martensite transformation respectively.
Mechanical Behavior of Hinge Lozenge Grid Structure
Authors: Li Zhong , Wang Shuai , Zhou Kaifa , Tan Qianwen , Feng Huolei 
Published: August 2019

Abstract
There are two phenomena in the inflation process of the existing stent, dogboning and axial expansion, which will shorten the life of the stent and lead to the failure of stenting. Firstly, The hinge lozenge grid structure with negative Possion’s ratio was reported. Secondly, the process of inflation and springback of stent were simulated based on finite element method in order to analyse its expansion, axial expansion ratio and resilience rate. It is demonstrated that hinge lozenge grid structure with symmetrical deformation exhibits “full-scale expansion” structural properties. Besides, the diameter of inflated stent is twice as much as initial after expansion. Also, it shows axial elongation as well as increasing axial expansion ratio. The displacement changes obviously with the increase of pressure with other conditions unchanged. This new structure not only improves the radial support performance of intravascular stents significantly, but also overcomes the shortage of traditional stents, which provides a new idea for the design and optimization of intravascular stents.
The Orthogonal Experiments for Radial Jet Cyclone
Authors: Mo Yuchen , Liu Genfan , Liu Xianjie , Zhou Jielian 
Published: August 2019

Abstract
Radial jet cyclone (RJC) is a new type of dust removal equipment based on the improvement of traditional cyclone which greatly improves the separation efficiency of small size particles and inevitably increases the pressure drop. In order to explore the comprehensive influence of the structure size and process parameters of the radial jet cyclone on its separation efficiency, this paper selected five main influencing factors: blade helix angle, blade length, vortex finder depth, airflow velocity and particle concentration to design a set of orthogonal experiments. Through analysis, the experimental results show that the flow velocity has the greatest influence on the pressure drop, followed by the blade helix angle, and the other three factors have a smaller influence. The insertion depth of the riser has the greatest influence on the separation efficiency. While the smaller the vortex finder depth is, the higher the separation efficiency. The other influencing factors are blade helix angle, airflow velocity, blade length and dust concentration.
Study on the Transient Creep Stage by Small Beam Specimen with Fixed Constraints
Authors: Wang Junqi , Zhou Guoyan , Tu Shantung 
Published: August 2019

Abstract
Three-point bending specimen with fixed constraint (TPBSF) has potential advantages in engineering application because of its simple stress state and easily achievement of rupture data. It is critical to accurately evaluate the creep curve of TPBSF for the application in engineering. In this study, TPBSF behavior of aluminium alloy A7N01 at 653K has been investigated at various loads in the range 12-20N. The creep curve clearly exhibited transient, steady-state and tertiary stages. The creep displacement data has been analysed according to the Garofalo’s equation. The rate of exhaustion of transient creep exhibited similarly dependence on load as steady-state displacement rate. It indicates that the transient and steady-state creep displacement of TPBSF obey the same kinetics law. The time to attain the steady-state stage and the rupture time are approximately inversely proportional to the rate of exhaustion of transient creep. The transient stage of TPBSF creep accounts for about 34% of the overall creep time. It is useful for predicting TPBSF creep deformation and residual life of the material.
Coupled Responses in a Partially Liquid-Filled Container with the Multi-Elastic Baffles Subjected to Pitching Excitation
Authors: Wang Jiadong , Cao Zhanxue 
Published: August 2019

Abstract
The coupled responses in the partially liquid filled container with multi-elastic annular baffles are investigated by the semi-analytical method subjected to the pitching excitations. The trial solutions of the dynamic deflections of the multi-elastic baffles, the surface wave height and the velocity potential can be obtained by introducing the time-dependent generalized coordinates. The Stokes-Joukowski potentials, which are relevant to the kinematical boundary condition of the container, can be obtained analytically. Based on the coupled vibration equations of the multi-elastic baffles and the boundary conditions on the free surface, the coupled dynamic response equations can be established. Parameter studies are carried out to investigate the effects of the parameters of the multi-elastic baffles on the coupled responses of the system.
Study and Application of Self-Adaptive Fuzzy PID Control in Dissolved Oxygen Control of Wastewater Treatment
Authors: Zhang Dasen , Chu Jian , He Yacong , Jin Hui , Han Wei 
Published: August 2019

Abstract
In view of the typical nonlinear, time-varying and large lag characteristics of dissolved oxygen (DO) concentration control in wastewater treatment, it is difficult to obtain a good control performance by using conventional proportional-integral-derivative (PID) control. In order to greatly improve the control effect, designing a self-adaptive fuzzy PID controller. Through analysis and reasoning can obtain the optimal control effect under the optimal membership. MATLAB simulation and application show that compared with the conventional PID control, the self-adaptive PID controller accelerates the response speed of the dissolved oxygen control system and reduces the overshoot. This control method achieves a better control performance in the actual sewage treatment central control system, improves the sewage treatment efficiency, and has the value of popularization and application.
Experimental Study of Recrystallization for C-Mn extruded Workpiece
Authors: Yang Baojian , Jiang Li , Li Huijun , Zhong Yonghua , Tang Jianhua 
Published: August 2019

Abstract
Recrystallization is a key step while conducting the composite process of severe extruding and heating treatment for fabricating the ultrafine-grained parts, howerer, the heating temperature palys a vital role that it directly effects the metallographic structure of extruded workpiece. In order to reveal the effects of heating temperature on metallographic structure of the extruded workpieces,three kinds of samples with different reduction ratio were put into the heating furnace when the temperature in frunace is over the recovery temperature of C-Mn extruded workpiece(about 450 °C), that is to shorten the temperature-rising time,thus the nucleation rate was increased simultaneously by doing so. During the heating process, the time-constant & temperature-varying together with time-varying & temperature-constant experimental scheme were adopted for different samples. Finally by measuring the hardness and analyzing the micro structures of C-Mn extruded workpiece, it can be concluded that fully recrystallization occurs in No.3 extruded workpiece with the condition of heating for 1 hour at 580 °C and cooled in the furnace, its average size is about 1 um.
Simulation Research on Variable Frequency Control System of Hoist in Inland River Locks Based on Fuzzy PID
Authors: An Xiaogang , Zhu Weiwei , An Na 
Published: August 2019

Abstract
In view of the demand in the operation process of lock gate as “slow start-fast run-slow stop”, our study introduced the variable frequency control technology and established the opening and closing machine control system model. We conducted the closed-loop control simulation based on fuzzy PID to effectively suppress or eliminate the influence of error. Thus, the optimal control algorithm and strategy are obtained, and the precise control of the opening and closing process of the miter gate is realized.
The Application of Intelligent Simulated Human Teaching Equipment in Clinical Practice
Authors: Wang Na , Han Wei , Wang Rui , Wang Jinguo 
Published: August 2019

Abstract
The application of modern science and technology to the basic experimental teaching of medical students is an important trend in the reform of experimental teaching in medical colleges and universities. The international advanced intelligent simulated human ECS teaching equipment and integrated functional experimental teaching are organically combined to operate and apply in the virtual clinical cases, and the theoretical knowledge and clinical skills are tested. This has achieved remarkable results in the cultivation of modern medical education talents, and has achieved the goal of cultivating students’ clinical thinking and analytical ability, and improving the comprehensive quality of medical students, thus providing new ideas for the reform of modern functional experiment teaching.
A Novel Gear Honing Machine Parameter Design and Finite Element Analysis Based on the Principle of Dislocation Axis Line Contact
Authors: Yu Lijuan , Guo Xinxu , Zhang Xuecheng , Wang Xin , Ji Xiaoming , Wang Hongguo 
Published: August 2019

Abstract
The characteristics of the dislocation axis line contact gear space transmission was analyzed in order to study the new precision gear honing machine prototype which could be clamped and formed at one time, and a pair of dislocation axis involute helical gears in space was designed from the most basic principle of involute gear meshing. The vertical dislocation axis line contact the worm and worm gear (helical gear) transmission mechanism were formed, when two gears had equalent normal base diameter and the sum of their base-circle spiral angles was equal to 90°. According to worm drive relationship of the vertical dislocation axis line contact, the helical gear tooth surface was honed through the worm could be used as a grinding wheel of the honing machine. Grinding wheels with different parameters could be used to machine bevel gears with different modulus, different numbers of teeth and different tooth widths. The finite element analysis and optimization showed that the prototype of the machine tool was reasonable, and the first-order natural frequency is 341.8Hz, which was much higher than the working frequency of 30Hz to avoid resonance.