bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of BiOBrXCl1-X by Solvothermal Method and Its Photocatalytic Activity
Authors: Wu Yijiang , Deng Xiaoyan , Zhang Zhenying , Li Weibin 
Published: March 2020

Abstract
In order to improve the activity of monohalide ruthenium oxide, different ratios of BiOBrXCl1-X series samples (X=0, 0.2, 0.4, 0.6, 0.8, 1) were synthesized by solvothermal method. The synthesized BiOBrXCl1-X samples were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS) and scanning electron microscopy(SEM). The photocatalytic degradation experiment for Rhodamine B showed that the BiOBr0.2Cl0.8 sample had higher degradation efficiency under visible light and effectively improved photocatalytic activity.
Study of microstructure and mechanical properties of pure titanium processed by new route of equal channel angular pressing
Authors: Li Xue , Du Meitong , Mao Zhoujian , Huang Tao , Ban Chunyan 
Published: March 2020

Abstract
In this study, samples of pure titanium were processed by equal channel angular pressing (ECAP) up to four passes at 573 K to produce a refined microstructure under different deformation routes. A new route B135 was developed by defining 135° clockwise rotation of samples in each pass. In order to study the deformed structures, optical micrograph (OM) and electron backscatter diffraction (EBSD) analysis were performed, and the mechanical property was evaluated by the microhardness tests. The OM and EBSD results reveal that the mean grain size of ECAPed samples is much finer than that of the initial sample. Furthermore, it also reveals that B135 is much effective in terms of grain refinement. The microhardness test results show that ECAP process via both route B135 and BC causes a much increase in hardness.
Study on the Effect of Additives on the Corrosion to Metal Heating Surface Caused by Alkali Metal Chloride and Sulfate in Biomass-fired Boilers
Authors: Li Yungang , Wang Yongzheng , Zhang Ke , Sun Yu 
Published: March 2020

Abstract
In this paper, the horizontal tube furnace was used to study the inhibition effect of various additives on the corrosion to metal heating surface in biomass-fired boiler. The results showed that the corrosion rate of the metal samples was significantly reduced by kaolin, pulverized coal ash, silica fume, dolomite, limestone and bauxite. When kaolin, pulverized coal ash, silica fume and bauxite are used as additives, the corrosion is obviously inhibited. When dolomite and limestone are used as additives, the inhibition effect is poor, but the corrosion rate is also reduced. The corrosion ability of alkali metal chloride is greater than that of alkali metal sulfate. Different additives have different inhibitory effects on them.
Study of Electron Spin Diffusion and Relaxation Dynamics by Diffraction of transient spin grating in an Intrinsic GaAs/AlGaAs Quantum Well
Authors: Yu Hualiang , Zhou Yinwu , Liu Liqin , Chen Xiyao , Wang Jianbin , Zhang Meiyu 
Published: March 2020

Abstract
In this paper, the transient spin grating method was used to measure the attenuation rate of the diffraction signals of the intrinsic spin gratings of the intrinsic GaAs/AlGaAs quantum wells in different periods at room temperature, and the electron spin diffusion coefficient Ds
= 121±6cm2/s was obtained. The electron spin diffusion coefficients of GaAs/AlGaAs quantum well were in good agreement with that of p-type GaAs/AlGaAs quantum well, indicating that the doping type for GaAs/AlGaAs quantum well has no significant effect on the diffusion rate of spin-polarized electrons. In this paper, the widely used formula of transient spin grating diffraction signal attenuation rate was used to fit the diffraction experimental results of the transient spin grating in the intrinsic GaAs/AlGaAs quantum well. The measured electron spin relaxation time was much shorter than that measured by the saturation absorption method. The reason for the deviation in the measured spin relaxation time was analyzed. The dynamic law of transient spin grating modulation attenuation over time was derived. The decay rate formula was modified, and the modified formula was used to fit the experimental data in the transient spin grating diffraction to obtain the spin relaxation time τs
= 123 ps. The result was consistent with the measured electron spin relaxation time by the saturation absorption method.
Study on Film Formation Properties of SiC Slurry
Authors: Xu Man , Wu Mengyu , Wang Shulin , Guan Mengke 
Published: March 2020

Abstract
Two kinds of silicon carbide (SiC) powders with median diameters of 0.60μm and 2.04μm were selected as raw materials, and uniformly dispersed SiC coating film solutions were prepared through different particle grading. The effects of gradation ratio and dispersant tetramethylammonium hydroxide (TMAH) on the dispersibility and rheology of SiC coating films were studied, and the effect of dispersant content on the film forming properties of the slurry was discussed. When the fine powder and coarse powder grading mass ratio is 3:7, the particle size distribution of the mixed powder is closest to the theoretical distribution of the Dinger model. At this time, the slurry has good rheology and high particle bulk density. When 0.4% TMAH is added, the viscosity of the slurry is the lowest. When TMAH is added in an amount of 0.1 to 0.2%, the slurry has good film-forming properties.
Reconstruction of cotton-polyester blended fabric
Authors: Li Zhi 
Published: March 2020

Abstract
Through this article, as the procedures of added glycol (EG) catalyzer 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. To added separation product (BHET) and catalyzer in the Polycondensation reaction system to polycondensation BHET as reconstituted Polyethylene terephthalate (PET). The experimental results indicated that separated cotton and reconstituted PET meet the requirement of recycling.
Durability and bending behaviour of concrete beams reinforced with hybrid GFRP rods and steel bars
Authors: Ren Yanru 
Published: March 2020

Abstract
It is feasible to take the place of steel bars with FRP rods as the pulled main bars in the reinforced concrete structures by many researchers. However, FRP rods concrete beams have been limited due to many reasons, such as the lower elastic modulus of FRP rods and reduced the ductility of the members owning to the fragility of FRP rods. In order to finish off these trouble, scholars have adopted a possible method that simultaneously utilizing FRP rods and steel bars in concrete members for reinforcement. The bending behaviour and durability of this new form of reinforcing member may still be problematic and this field needs further study. The bending behaviour and durability of concrete beams reinforced with hybrid GFRP rods and steel bars have been experimentally studied and some conclusions have been got.
Spatial Distribution characteristics and Ecological risk Assessment of heavy Metal As, Ba in soil of a Chemical Slag Field in Sichuan Province
Authors: Wu FangJian , Xu GuiHong 
Published: March 2020

Abstract
45 boreholes were determined according to the situation of an industrial slag field in Sichuan Province. According to 10~20cm stratification as soil sampling, the content and characteristic distribution of heavy metal elements, such as barium (Ba), arsenic (AS) in soil, were determined, and the spatial distribution characteristics of As, Ba were studied by Geostatistics method. The pollution and ecological risk of As, Ba in the industrial slag site were analyzed by using the single factor index method, the Nemerow index method and the potential risk index evaluation. The results show that barium is the main pollution factor of waste residue, with an average value of 127576μg/L, which is mainly distributed in the range of 2.908~2667000 μg/L. The mean value of arsenic was 8.72 mg/kg, respectively.
Mechanical characteristics analysis of two-stepped slope based on flow-solid coupled method
Authors: Chen Xiaoran , Lu Yulin , Lin Wei , Wang Li 
Published: March 2020

Abstract
Atwo-stepped slope stress and displacementfield characteristic is analyzed by the flow-solid coupled method in this study. The results of numerical simulation show that the maximum displacement of the coupled method appeared on the slope top and the value is larger than the results of uncoupled method. The results of stress show that the first principalstress of coupled method is larger, and this character is consistent with the coupled effect between groundwater seepage and stress, and then proved that the influence of groundwaterseepage on stress is not neglect. The analysis method of this paper provides a reference for the stability of multi-stepped slope under complex conditions.
Fuzzy-Random Reliability Analysis of loess landslide Stability Under Earthquake
Authors: Mu Peng 
Published: March 2020

Abstract
In this paper, the fuzziness of the failure events and the parameters of the random variables is considered. In the reliability analysis of the loess landslide stability, the combination of the randomness and fuzziness is proposed, and the fuzzy random reliability calculation method of the loess landslide stability under the earthquake action is proposed. The established model is applied to the seismic stability analysis of a loess landslide, and the evaluation results show that the loess landslide is in an under stable state under the seismic action.
Experimental study on the tensile performance of cement stabilized recycled aggregate pavement base
Authors: Chen Feng 
Published: March 2020

Abstract
As the main bearing stratum of pavement, the base mixture is equivalently subject to external shear stress when unevenly stressed, so the splitting performance is an important parameter to measure its engineering characteristics. The results of splitting and splitting rebound test showed that the strength and rebound modulus of cement stabilized macadam and cement stabilized recycled aggregate increased exponentially with age. Through comparative analysis, it was found that the splitting and tensile properties of cement stabilized recycled aggregate were slightly inferior to that of cement stabilized macadam. Finally, the strength calculation formula of the mixture was derived, which could provide reference for practical engineering.
Literature review of seismic performance of double-layer steel plate-concrete composite shear wall with stiffeners
Authors: Wang Chungang , Liu Shengkai , Chen Yong , Chen Peng 
Published: March 2020

Abstract
Shear wall, as the main anti-sway component in high-rise buildings, plays an important role in resisting horizontal earthquakes. Shear wall has high ductility and high bearing capacity with the participation of steel plate, which can meet the requirements of high-rise building structures on structural members. Shear wall with steel plate is divided into two types according to the construction method, one is Shear wall with single steel plate, and the other is shear wall with two layers of steel plates. n recent years, double steel plate shear walls with stiffeners have attracted much attention due to their good ductility and ease of construction. By summarizing the current research situation of steel plate concrete shear walls, suggestions are made for future research.
Study on influencing factors of mechanical properties of ceramsite foam concrete based on orthogonal test
Authors: Tao Feiyu , Gu Pengyuan , Yang Ying 
Published: March 2020

Abstract
In this paper, orthogonal test is used to optimize the mix ratio of ceramsite foam concrete and improve the strength of ceramsite foam concrete with ceramsite content, water-cement ratio and fly ash content as the research parameters, and the compressive strength is taken as the main investigation index.The experimental results show that the content of fly ash has the greatest influence on the compressive strength of ceramsite foam concrete, the content of ceramsite is the second, and the ratio of water to cement is the smallest.Through experiment and analysis, the recommended mix ratio is as follows: the content of ceramsite is 10% ∼20%, the amount of fly ash is 10% ∼15%, and the ratio of water to cement is 0.4 ∼0.5.
Fatigue life of CFRP laminate strengthened high-strength steel plates under fatigue loadings
Authors: Zheng Yun , Hu Lili , Wang Yuanyuan , Feng Peng 
Published: March 2020

Abstract
Carbon fiber reinforced polymer (CFRP) sheets and laminates are effective and practical for strengthening steel with initial damages under fatigue loading due to its advantageous strength and fatigue resistance. Unfortunately, studies of cracked high-strength steel plates strengthened by CFRP laminates are still limited. This paper studies the strengthening efficiency of CFRP laminate on cracked Q345, Q460 and Q690 steel plates under fatigue loading. It is found the fatigue life by CFRP laminates is increased to 1.53 to 3.84 times as that of un-strengthened specimen. Compared with CFRP sheet with the similar reinforcement stiffness, CFRP laminate strengthened specimens exhibit longer fatigue life under low stress range (195 MPa), and shorter fatigue life under high stress range (240.5 and 402.5 MPa). The difference is due to the matched adhesive of CFRP laminates (Araldite-2015) has lower elastic modulus but higher strength and ductility compared with matched adhesive of CFRP sheets (E2500S). Thus the material property of adhesive is a key factor determining fatigue life under different range of fatigue loadings. Crack propagation and different failure modes were observed. Serious debonding around the crack tip occurred, which leads to a further study.
Comparative study on calculation methods for local buckling critical stress of rectangular section FRP members
Authors: Hu Yifan , Yang Zhipeng , Tao Feiyu 
Published: March 2020

Abstract
The prediction accuracy of the local buckling critical stress calculation formula of the existing FRP members is analyzed by the experimental data of the local buckling critical stress of the fiber reinforced polymer (FRP) members.Verification of the validity of the finite element model based on experimental data.The comparison results between the numerical simulation critical stress and the predicted value of the calculation formula after adjusting the size of the FRP member are obtained. The variation of the prediction accuracy of the existing calculation formula is studied.The research shows that the predictive value of the calculation method proposed by Strongwell in 1998 underestimated the database test data by 45.4%, and underestimated the finite element simulation result by 46.3%.It is the equation closest to the actual local buckling critical force of the PFRP member. As a general formula, predicting the local buckling critical stress of the PFRP member can improve the material utilization rate. After the research, it was found that the calculation formula proposed by Strongwell Company had a large error with the database test data, and there is still room for improvement.
Experiment study on mechanical properties of sand-doped bentonite
Authors: Cao Yupeng , Zhang Rui , Xu GuiZhong , Zhang Shuai , Xu Jianwen 
Published: March 2020

Abstract
Bentonite is a special soil with water expansion and water loss shrinkage properties, which is widely used as backfill material. In order to explore the effect of sand content on the properties of Bentonite, compaction test, wL
(liquid limit) and wP
(plastic limit) test, direct shear test and permeability test were taken to analyse the compaction, hydrophilic, shear characteristics and permeability of sand-blended bentonite. The results show that as the amount of bentonite increases, wop
(the optimal water content), wL
, wP
and IP
(plastic index) of sand-doped bentonite increase, the Pdmax (the maximum dry density) and cohesion increase first and then decrease, the angle of internal friction decreases gradually. When bentonite content is less than 20%, increasing the content of bentonite has significant effect on reducing coefficient of permeability.
Crack propagation and debonding development of CFRP laminate strengthened high-strength steel plates under fatigue loadings
Authors: Zheng Yun , Wang Yuanyuan , Hu Lili , Feng Peng 
Published: March 2020

Abstract
Carbon fiber reinforced polymer (CFRP) has been used to strengthen steel structures to enhance fatigue life. A crack growth induced debonding region in the adhesive-steel interface has been observed in failure modes. However, limited studies focus on its gradual development with fatigue loadings, especially for CFRP laminate strengthened cracked high strength steel plates. The purpose of this paper is to obtain the corresponding relationship of crack propagation and debonding development. Thus fatigue tests with measuring real-time change of CFRP strain distribution by Digital Image Correlation (DIC) system were conducted for Q345, Q460, Q690 steel under fatigue loading at the same stress level 50% but difference stress ranges. Although debonding at the adhesive-steel interface is invisible, through calculation of strain gradient, it is found that as the increase of crack length, the debonding region around the crack tip occurs and gradually becomes larger. Furthermore, the shape of debonding region is always similar to an ellipse from the beginning of loading to failure.
Pavement deformation prediction and monitoring case analysis of jacking and underpass highway in Huairou District, Beijing
Authors: Yuan Ye , Wang Yang , Zhao Shuqing , Ding Mengda 
Published: March 2020

Abstract
In recent years, with the construction of municipal pipeline, the situation of pipeline crossing highway is increasing day by day, and the pipe jacking construction is often used at the crossing place. Pipe jacking construction will inevitably cause deformation of surrounding soil and ground settlement, which will affect the smoothness of the road and the comfort of driving. Taking Huairou District sewage pipe jacking project as an example, this paper uses numerical simulation method to simulate the construction process, predict the deformation of the road surface during the construction process of the road crossing, and verify the feasibility of the calculation of subgrade deformation caused by pipe jacking construction by analyzing the monitoring data.
Research of autonomous moving track detection vehicle
Authors: Tang Chao , Jia Jing , Chen Chuang , Zhao Siyu , Zhu Tianci , Lv Xiaojun , Zhao Sihai 
Published: March 2020

Abstract
At present, track measurement instruments are mostly manually driven for measurement, and the detection efficiency is not high, which cannot meet the needs of rapid development of rail transit. In this paper, an autonomous moving track detection device driven by wheel hub motor is developed, and the inertial measurement method is applied to track parameter detection to improve track detection efficiency and accuracy.And realize the remote control of wheel motor by GSM module.
Path planning algorithm of the intelligent vehicle considering the passenger feelings
Authors: Zhang Kaijiong , Zhang Xi , Deng Weishun , Yu Fan , Shang Shiliang , Guo Mengge 
Published: March 2020

Abstract
As the autonomous driving vehicle becomes popular, the driver will be completely replaced by autonomous system, but passengers in the vehicle will always exist. Autonomous vehicle has the essential property of transporting people, so the passenger comfortability should be fully considered. In this paper, based on the trust between the passenger and the driver, the passenger physical and psychological feelings are comprehensively considered. Through the real track test data, the support vector machine is used to establish the passenger feeling evaluation model -- to show the relationship between the passenger and the autonomous driving system. And then, based on the evaluation model, a new path planner algorithm is proposed, which is proved by simulation that the re-planning path can significantly improve the passenger comfortability.
Design of Intelligent Watering System of Flower Based on ZigBee and WiFi
Authors: Huang Wuyang , Yang Fan 
Published: March 2020

Abstract
Aiming at the problem that the traditional artificial watering method in flowers is time-consuming and laborious, and cannot reasonably water the growth of each flower, an intelligent watering system of flower cultivation based on ZigBee and WiFi technology is designed. The CC2530 chip is used as the main control chip for ZigBee communication. Multiple terminal nodes and the coordinator node are wirelessly communicated through the ZigBee network. The RTL8710 is used as the WiFi communication chip to upload data to the host computer. The data and image curves are displayed on the host computer in real time. A composite switching control algorithm based on fuzzy control and PID control is designed. Based on the collected temperature and humidity and light intensity, the irrigation demand is calculated to achieve a better water-saving irrigation effect. Through the test, the entire system with excellent control performance and practical application value.
A Design Method of Missile Acceleration Autopilot Based on Active Disturbance Rejection Control
Authors: Chen Siyuan , Yang Lihong , Liu Yunfeng 
Published: March 2020

Abstract
In order to solve the problem that the performance of the traditional two-loop acceleration autopilot is relatively large affected by the missile aerodynamic, an improved design method based on active disturbance rejection control (ADRC) is proposed. The ADRC acceleration autopilot adopts the extended state observer (ESO) to estimate the disturbance and eliminate the impact of the model uncertainties and external disturbances, which achieve good interference suppression and accurate tracking of command. Then the pole placement method is used for the ADRC autopilot parameter design. Finally, the ADRC autopilot is compared to traditional two-loop autopilot and two-loop autopilot with PI correction under parameters uncertainty and external disturbance, the simulation results demonstrate that the impact of these two factors on the performance of the ADRC autopilot is relatively small. Therefore, the ADRC autopilot is proved to have fast response speed, good transient process, strong anti-interference ability and robustness.
Speed Control Study of Brushless DC motor Based on Fuzzy Optimization PID
Authors: He Menggao , Zhang Tong , Huang Jiexin , Luo Congjie 
Published: March 2020

Abstract
Targeting at the problems of response lag and poor control effect of traditional PID speed control system for brushless DC motor, a novel PID speed regulation system based on fuzzy optimization was proposed in this paper. On the basis of analyzing basic working principle of brushless DC motor, the new fuzzy selftuning PID optimal controller is introduced, the controller output switches power MOSFET devices by changing the duty ratio of PWM control signal, thus the speed control of brushless DC motor was realized. Both the fuzzy optimized PID control introduced in this paper and the traditional PID control are respectively simulated and compared under the Matlab/Simulink environment. The results show that with the fuzzy optimized PID control system has better performance than traditional PID control.